2443 lines
102 KiB
Plaintext
2443 lines
102 KiB
Plaintext
This is transient.info, produced by makeinfo version 6.5 from
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transient.texi.
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Copyright (C) 2018-2020 Jonas Bernoulli <jonas@bernoul.li>
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You can redistribute this document and/or modify it under the terms
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of the GNU General Public License as published by the Free Software
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Foundation, either version 3 of the License, or (at your option)
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any later version.
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This document is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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INFO-DIR-SECTION Emacs
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START-INFO-DIR-ENTRY
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* Transient: (transient). Transient Commands.
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END-INFO-DIR-ENTRY
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File: transient.info, Node: Top, Next: Introduction, Up: (dir)
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Transient User and Developer Manual
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***********************************
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Taking inspiration from prefix keys and prefix arguments, Transient
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implements a similar abstraction involving a prefix command, infix
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arguments and suffix commands. We could call this abstraction a
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"transient command", but because it always involves at least two
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commands (a prefix and a suffix) we prefer to call it just a
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"transient".
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When the user calls a transient prefix command, then a transient
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(temporary) keymap is activated, which binds the transient’s infix and
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suffix commands, and functions that control the transient state are
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added to ‘pre-command-hook’ and ‘post-command-hook’. The available
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suffix and infix commands and their state are shown in a popup buffer
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until the transient is exited by invoking a suffix command.
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Calling an infix command causes its value to be changed, possibly by
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reading a new value in the minibuffer.
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Calling a suffix command usually causes the transient to be exited
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but suffix commands can also be configured to not exit the transient.
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This manual is for Transient version 0.2.0 (v0.2.0-8-gc94cff7+1).
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Copyright (C) 2018-2020 Jonas Bernoulli <jonas@bernoul.li>
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You can redistribute this document and/or modify it under the terms
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of the GNU General Public License as published by the Free Software
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Foundation, either version 3 of the License, or (at your option)
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any later version.
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This document is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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* Menu:
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* Introduction::
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* Usage::
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* Other Options::
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* Modifying Existing Transients::
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* Defining New Commands::
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* Classes and Methods::
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* Related Abstractions and Packages::
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* FAQ::
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* Keystroke Index::
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* Command Index::
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* Function Index::
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* Variable Index::
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— The Detailed Node Listing —
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Usage
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* Invoking Transients::
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* Aborting and Resuming Transients::
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* Common Suffix Commands::
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* Saving Values::
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* Using History::
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* Getting Help for Suffix Commands::
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* Enabling and Disabling Suffixes::
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* Other Commands::
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Defining New Commands
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* Defining Transients::
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* Binding Suffix and Infix Commands::
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* Defining Suffix and Infix Commands::
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* Using Infix Arguments::
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* Transient State::
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Binding Suffix and Infix Commands
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* Group Specifications::
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* Suffix Specifications::
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Classes and Methods
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* Group Classes::
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* Group Methods::
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* Prefix Classes::
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* Suffix Classes::
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* Suffix Methods::
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* Prefix Slots::
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* Suffix Slots::
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* Predicate Slots::
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Suffix Methods
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* Suffix Value Methods::
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* Suffix Format Methods::
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Related Abstractions and Packages
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* Comparison With Prefix Keys and Prefix Arguments::
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* Comparison With Other Packages::
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File: transient.info, Node: Introduction, Next: Usage, Prev: Top, Up: Top
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1 Introduction
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**************
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Taking inspiration from prefix keys and prefix arguments, Transient
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implements a similar abstraction involving a prefix command, infix
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arguments and suffix commands. We could call this abstraction a
|
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"transient command", but because it always involves at least two
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commands (a prefix and a suffix) we prefer to call it just a
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"transient".
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Transient keymaps are a feature provided by Emacs. Transients as
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implemented by this package involve the use of transient keymaps.
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Emacs provides a feature that it calls "prefix commands". When we
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talk about "prefix commands" in this manual, then we mean our own
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kind of "prefix commands", unless specified otherwise. To avoid
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ambiguity we sometimes use the terms "transient prefix command" for
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our kind and "regular prefix command" for Emacs’ kind.
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When the user calls a transient prefix command, then a transient
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(temporary) keymap is activated, which binds the transient’s infix and
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suffix commands, and functions that control the transient state are
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added to ‘pre-command-hook’ and ‘post-command-hook’. The available
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suffix and infix commands and their state are shown in a popup buffer
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until the transient state is exited by invoking a suffix command.
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Calling an infix command causes its value to be changed. How that is
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done depends on the type of the infix command. The simplest case is an
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infix command that represents a command-line argument that does not take
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a value. Invoking such an infix command causes the switch to be toggled
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on or off. More complex infix commands may read a value from the user,
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using the minibuffer.
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Calling a suffix command usually causes the transient to be exited;
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the transient keymaps and hook functions are removed, the popup buffer
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no longer shows information about the (no longer bound) suffix commands,
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the values of some public global variables are set, while some internal
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global variables are unset, and finally the command is actually called.
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Suffix commands can also be configured to not exit the transient.
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A suffix command can, but does not have to, use the infix arguments
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in much the same way it can choose to use or ignore the prefix
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arguments. For a suffix command that was invoked from a transient the
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variable ‘transient-current-suffixes’ and the function ‘transient-args’
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serve about the same purpose as the variables ‘prefix-arg’ and
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‘current-prefix-arg’ do for any command that was called after the prefix
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arguments have been set using a command such as ‘universal-argument’.
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The information shown in the popup buffer while a transient is active
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looks a bit like this:
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,-----------------------------------------
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|Arguments
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| -f Force (--force)
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| -a Annotate (--annotate)
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|
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|Create
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| t tag
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| r release
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`-----------------------------------------
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This is a simplified version of ‘magit-tag’. Info manuals do not
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support images or colored text, so the above "screenshot" lacks
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some information; in practice you would be able to tell whether the
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arguments ‘--force’ and ‘--annotate’ are enabled or not based on
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their color.
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Transient can be used to implement simple "command dispatchers". The
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main benefit then is that the user can see all the available commands in
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a popup buffer. That is useful by itself because it frees the user from
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having to remember all the keys that are valid after a certain prefix
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key or command. Magit’s ‘magit-dispatch’ command is an example of using
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Transient to merely implement a command dispatcher.
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In addition to that, Transient also allows users to interactively
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pass arguments to commands. These arguments can be much more complex
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than what is reasonable when using prefix arguments. There is a limit
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to how many aspects of a command can be controlled using prefix
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arguments. Furthermore what a certain prefix argument means for
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different commands can be completely different, and users have to read
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documentation to learn and then commit to memory what a certain prefix
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argument means to a certain command.
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Transient suffix commands on the other hand can accept dozens of
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different arguments without the user having to remember anything. When
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using Transient, then one can call a command with arguments that are
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just as complex as when calling the same function non-interactively
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using code.
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Invoking a transient command with arguments is similar to invoking a
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command in a shell with command-line completion and history enabled.
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One benefit of the Transient interface is that it remembers history not
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only on a global level ("this command was invoked using these arguments
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and previously it was invoked using those other arguments"), but also
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remembers the values of individual arguments independently. See *note
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Using History::.
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After a transient prefix command is invoked ‘C-h <key>’ can be used
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to show the documentation for the infix or suffix command that ‘<key>’
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is bound to (see *note Getting Help for Suffix Commands::) and infixes
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and suffixes can be removed from the transient using ‘C-x l <key>’.
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Infixes and suffixes that are disabled by default can be enabled the
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same way. See *note Enabling and Disabling Suffixes::.
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Transient ships with support for a few different types of specialized
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infix commands. A command that sets a command line option for example
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has different needs than a command that merely toggles a boolean flag.
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Additionally Transient provides abstractions for defining new types,
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which the author of Transient did not anticipate (or didn’t get around
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to implementing yet).
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File: transient.info, Node: Usage, Next: Other Options, Prev: Introduction, Up: Top
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2 Usage
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*******
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* Menu:
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* Invoking Transients::
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* Aborting and Resuming Transients::
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* Common Suffix Commands::
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* Saving Values::
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* Using History::
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* Getting Help for Suffix Commands::
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* Enabling and Disabling Suffixes::
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* Other Commands::
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File: transient.info, Node: Invoking Transients, Next: Aborting and Resuming Transients, Up: Usage
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2.1 Invoking Transients
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=======================
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A transient prefix command is invoked like any other command by pressing
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the key that is bound to that command. The main difference to other
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commands is that a transient prefix command activates a transient
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keymap, which temporarily binds the transient’s infix and suffix
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commands. Bindings from other keymaps may, or may not, be disabled
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while the transient state is in effect.
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There are two kinds of commands that are available after invoking a
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transient prefix command; infix and suffix commands. Infix commands set
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some value (which is then shown in a popup buffer), without leaving the
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transient. Suffix commands on the other hand usually quit the transient
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and they may use the values set by the infix commands, i.e. the infix
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*arguments*.
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Instead of setting arguments to be used by a suffix command, infix
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commands may also set some value by side-effect.
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File: transient.info, Node: Aborting and Resuming Transients, Next: Common Suffix Commands, Prev: Invoking Transients, Up: Usage
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2.2 Aborting and Resuming Transients
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====================================
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To quit the transient without invoking a suffix command press ‘C-g’.
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Key bindings in transient keymaps may be longer than a single event.
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After pressing a valid prefix key, all commands whose bindings do not
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begin with that prefix key are temporarily unavailable and grayed out.
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To abort the prefix key press ‘C-g’ (which in this case only quits the
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prefix key, but not the complete transient).
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A transient prefix command can be bound as a suffix of another
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transient. Invoking such a suffix replaces the current transient state
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with a new transient state, i.e. the available bindings change and the
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information displayed in the popup buffer is updated accordingly.
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Pressing ‘C-g’ while a nested transient is active only quits the
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innermost transient, causing a return to the previous transient.
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‘C-q’ or ‘C-z’ on the other hand always exits all transients. If you
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use the latter, then you can later resume the stack of transients using
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‘M-x transient-resume’.
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‘C-g’ (‘transient-quit-seq’)
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‘C-g’ (‘transient-quit-one’)
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This key quits the currently active incomplete key sequence, if
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any, or else the current transient. When quitting the current
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transient, then it returns to the previous transient, if any.
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Transient’s predecessor bound ‘q’ instead of ‘C-g’ to the quit
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command. To learn how to get that binding back see
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‘transient-bind-q-to-quit’’s doc string.
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‘C-q’ (‘transient-quit-all’)
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This command quits the currently active incomplete key sequence, if
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any, and all transients, including the active transient and all
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suspended transients, if any.
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‘C-z’ (‘transient-suspend’)
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Like ‘transient-quit-all’, this command quits an incomplete key
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sequence, if any, and all transients. Additionally it saves the
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stack of transients so that it can easily be resumed (which is
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particularly useful if you quickly need to do "something else" and
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the stack is deeper than a single transient and/or you have already
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changed the values of some infix arguments).
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Note that only a single stack of transients can be saved at a time.
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If another stack is already saved, then saving a new stack discards
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the previous stack.
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‘M-x transient-resume’ (‘transient-resume’)
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This command resumes the previously suspended stack of transients,
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if any.
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File: transient.info, Node: Common Suffix Commands, Next: Saving Values, Prev: Aborting and Resuming Transients, Up: Usage
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2.3 Common Suffix Commands
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==========================
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A few shared suffix commands are available in all transients. These
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suffix commands are not shown in the popup buffer by default.
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Most of these commands are bound to ‘C-x <key>’ and after pressing
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‘C-x’ a section featuring all common commands is temporarily shown in
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the popup buffer. After invoking one of these commands, that section
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disappears again. Note however that one of these commands is described
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as "Show common permanently"; invoke that if you want the common
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commands to always be shown for all transients.
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‘C-x t’ (‘transient-toggle-common’)
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This command toggles whether the generic commands that are common
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to all transients are always displayed or only after typing the
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incomplete prefix key sequence ‘C-x’. This only affects the
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current Emacs session.
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-- User Option: transient-show-common-commands
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This option controls whether shared suffix commands are shown
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alongside the transient-specific infix and suffix commands. By
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default the shared commands are not shown to avoid overwhelming the
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user with to many options.
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While a transient is active, pressing ‘C-x’ always shows the common
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command. The value of this option can be changed for the current
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Emacs session by typing ‘C-x t’ while a transient is active.
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The other common commands are described in either the previous node
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or in one of the following nodes.
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Some of Transient’s key bindings differ from the respective bindings
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of Magit-Popup; see *note FAQ:: for more information.
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File: transient.info, Node: Saving Values, Next: Using History, Prev: Common Suffix Commands, Up: Usage
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2.4 Saving Values
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=================
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After setting the infix arguments in a transient, the user can save
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those arguments for future invocations.
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Most transients will start out with the saved arguments when they are
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invoked. There are a few exceptions though. Some transients are
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designed so that the value that they use is stored externally as the
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buffer-local value of some variable. Invoking such a transient again
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uses the buffer-local value. (1)
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If the user does not save the value and just exits using a regular
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suffix command, then the value is merely saved to the transient’s
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history. That value won’t be used when the transient is next invoked
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but it is easily accessible (see *note Using History::).
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‘C-x s’ (‘transient-set’)
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This command saves the value of the active transient for this Emacs
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session.
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‘C-x C-s’ (‘transient-save’)
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Save the value of the active transient persistently across Emacs
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sessions.
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-- User Option: transient-values-file
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This file is used to persist the values of transients between Emacs
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sessions.
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---------- Footnotes ----------
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(1) ‘magit-diff’ and ‘magit-log’ are two prominent examples, and
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their handling of buffer-local values is actually a bit more complicated
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than outlined above and even customizable. This is something I am
|
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rethinking, but I don’t want to rush any changes.)
|
||
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||
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File: transient.info, Node: Using History, Next: Getting Help for Suffix Commands, Prev: Saving Values, Up: Usage
|
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2.5 Using History
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=================
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Every time the user invokes a suffix command the transient’s current
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value is saved to its history. These values can be cycled through the
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same way one can cycle through the history of commands that read
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user-input in the minibuffer.
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‘M-p’ (‘transient-history-prev’)
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This command switches to the previous value used for the active
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transient.
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‘M-n’ (‘transient-history-next’)
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This command switches to the next value used for the active
|
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transient.
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In addition to the transient-wide history, Transient of course
|
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supports per-infix history. When an infix reads user-input using the
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minibuffer, then the user can use the regular minibuffer history
|
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commands to cycle through previously used values. Usually the same keys
|
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as those mentioned above are bound to those commands.
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||
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Authors of transients should arrange for different infix commands
|
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that read the same kind of value to also use the same history key (see
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*note Suffix Slots::).
|
||
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Both kinds of history are saved to a file when Emacs is exited.
|
||
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||
-- User Option: transient-history-file
|
||
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This file is used to persist the history of transients and their
|
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infixes between Emacs sessions.
|
||
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-- User Option: transient-history-limit
|
||
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This option controls how many history elements are kept at the time
|
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the history is saved in ‘transient-history-file’.
|
||
|
||
|
||
File: transient.info, Node: Getting Help for Suffix Commands, Next: Enabling and Disabling Suffixes, Prev: Using History, Up: Usage
|
||
|
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2.6 Getting Help for Suffix Commands
|
||
====================================
|
||
|
||
Transients can have many suffixes and infixes that the user might not be
|
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familiar with. To make it trivial to get help for these, Transient
|
||
provides access to the documentation directly from the active transient.
|
||
|
||
‘C-h’ (‘transient-help’)
|
||
|
||
This command enters help mode. When help mode is active, then
|
||
typing ‘<key>’ shows information about the suffix command that
|
||
‘<key>’ normally is bound to (instead of invoking it). Pressing
|
||
‘C-h’ a second time shows information about the _prefix_ command.
|
||
|
||
After typing ‘<key>’ the stack of transient states is suspended and
|
||
information about the suffix command is shown instead. Typing ‘q’
|
||
in the help buffer buries that buffer and resumes the transient
|
||
state.
|
||
|
||
What sort of documentation is shown depends on how the transient was
|
||
defined. For infix commands that represent command-line arguments this
|
||
ideally shows the appropriate manpage. ‘transient-help’ then tries to
|
||
jump to the correct location within that. Info manuals are also
|
||
supported. The fallback is to show the command’s doc string, for
|
||
non-infix suffixes this is usually appropriate.
|
||
|
||
|
||
File: transient.info, Node: Enabling and Disabling Suffixes, Next: Other Commands, Prev: Getting Help for Suffix Commands, Up: Usage
|
||
|
||
2.7 Enabling and Disabling Suffixes
|
||
===================================
|
||
|
||
The user base of a package that uses transients can be very diverse.
|
||
This is certainly the case for Magit; some users have been using it and
|
||
Git for a decade, while others are just getting started now.
|
||
|
||
For that reason a mechanism is needed that authors can use to
|
||
classify a transient’s infixes and suffixes along the
|
||
essentials...everything spectrum. We use the term "levels" to describe
|
||
that mechanism.
|
||
|
||
Each suffix command is placed on a level and each transient has a
|
||
level (called transient-level), which controls which suffix commands are
|
||
available. Integers between 1 and 7 (inclusive) are valid levels. For
|
||
suffixes, 0 is also valid; it means that the suffix is not displayed at
|
||
any level.
|
||
|
||
The levels of individual transients and/or their individual suffixes
|
||
can be changed interactively, by invoking the transient and then
|
||
pressing ‘C-x l’ to enter the "edit" mode, see below.
|
||
|
||
The default level for both transients and their suffixes is 4. The
|
||
‘transient-default-level’ option only controls the default for
|
||
transients. The default suffix level is always 4. The authors of
|
||
transients should place certain suffixes on a higher level, if they
|
||
expect that it won’t be of use to most users, and they should place very
|
||
important suffixes on a lower level, so that they remain available even
|
||
if the user lowers the transient level.
|
||
|
||
(Magit currently places nearly all suffixes on level 4 and lower
|
||
levels are not used at all yet. So for the time being you should not
|
||
set a lower default level and using a higher level might not give you as
|
||
many additional suffixes as you hoped.)
|
||
|
||
-- User Option: transient-default-level
|
||
|
||
This option controls which suffix levels are made available by
|
||
default. It sets the transient-level for transients for which the
|
||
user has not set that individually.
|
||
|
||
-- User Option: transient-levels-file
|
||
|
||
This file is used to persist the levels of transients and their
|
||
suffixes between Emacs sessions.
|
||
|
||
‘C-x l’ (‘transient-set-level’)
|
||
|
||
This command enters edit mode. When edit mode is active, then all
|
||
infixes and suffixes that are currently usable are displayed along
|
||
with their levels. The colors of the levels indicate whether they
|
||
are enabled or not. The level of the transient is also displayed
|
||
along with some usage information.
|
||
|
||
In edit mode, pressing the key that would usually invoke a certain
|
||
suffix instead prompts the user for the level that suffix should be
|
||
placed on.
|
||
|
||
Help mode is available in edit mode.
|
||
|
||
To change the transient level press ‘C-x l’ again.
|
||
|
||
To exit edit mode press ‘C-g’.
|
||
|
||
Note that edit mode does not display any suffixes that are not
|
||
currently usable. ‘magit-rebase’ for example shows different
|
||
suffixes depending on whether a rebase is already in progress or
|
||
not. The predicates also apply in edit mode.
|
||
|
||
Therefore, to control which suffixes are available given a certain
|
||
state, you have to make sure that that state is currently active.
|
||
|
||
|
||
File: transient.info, Node: Other Commands, Prev: Enabling and Disabling Suffixes, Up: Usage
|
||
|
||
2.8 Other Commands
|
||
==================
|
||
|
||
When invoking a transient in a small frame, the transient window may not
|
||
show the complete buffer, making it necessary to scroll, using the
|
||
following commands. These commands are never shown in the transient
|
||
window, and the key bindings are the same as for ‘scroll-up-command’ and
|
||
‘scroll-down-command’ in other buffers.
|
||
|
||
-- Command: transient-scroll-up arg
|
||
|
||
This command scrolls text of transient popup window upward ARG
|
||
lines. If ARG is ‘nil’, then it scrolls near full screen. This is
|
||
a wrapper around ‘scroll-up-command’ (which see).
|
||
|
||
-- Command: transient-scroll-down arg
|
||
|
||
This command scrolls text of transient popup window down ARG lines.
|
||
If ARG is ‘nil’, then it scrolls near full screen. This is a
|
||
wrapper around ‘scroll-down-command’ (which see).
|
||
|
||
|
||
File: transient.info, Node: Other Options, Next: Modifying Existing Transients, Prev: Usage, Up: Top
|
||
|
||
3 Other Options
|
||
***************
|
||
|
||
-- User Option: transient-show-popup
|
||
|
||
This option controls whether the current transient’s infix and
|
||
suffix commands are shown in the popup buffer.
|
||
|
||
• If ‘t’ (the default) then the popup buffer is shown as soon as
|
||
a transient prefix command is invoked.
|
||
|
||
• If ‘nil’, then the popup buffer is not shown unless the user
|
||
explicitly requests it, by pressing an incomplete prefix key
|
||
sequence.
|
||
|
||
• If a number, then the a brief one-line summary is shown
|
||
instead of the popup buffer. If zero or negative, then not
|
||
even that summary is shown; only the pressed key itself is
|
||
shown.
|
||
|
||
The popup is shown when the user explicitly requests it by
|
||
pressing an incomplete prefix key sequence. Unless this is
|
||
zero, then the popup is shown after that many seconds of
|
||
inactivity (using the absolute value).
|
||
|
||
-- User Option: transient-enable-popup-navigation
|
||
|
||
This option controls whether navigation commands are enabled in the
|
||
transient popup.
|
||
|
||
While a transient is active the transient popup buffer is not the
|
||
current buffer, making it necessary to use dedicated commands to
|
||
act on that buffer itself. This is disabled by default. If this
|
||
option is non-nil, then the following features are available:
|
||
|
||
• ‘<up>’ moves the cursor to the previous suffix. ‘<down>’
|
||
moves the cursor to the next suffix. ‘RET’ invokes the suffix
|
||
the cursor is on.
|
||
|
||
• ‘<mouse-1>’ invokes the clicked on suffix.
|
||
|
||
• ‘C-s’ and ‘C-r’ start isearch in the popup buffer.
|
||
|
||
-- User Option: transient-display-buffer-action
|
||
|
||
This option specifies the action used to display the transient
|
||
popup buffer. The transient popup buffer is displayed in a window
|
||
using ‘(display-buffer buf transient-display-buffer-action)’.
|
||
|
||
The value of this option has the form ‘(FUNCTION . ALIST)’, where
|
||
FUNCTION is a function or a list of functions. Each such function
|
||
should accept two arguments: a buffer to display and an alist of
|
||
the same form as ALIST. See *note (elisp)Choosing Window::.
|
||
|
||
The default is ‘(display-buffer-in-side-window (side . bottom))’.
|
||
This displays the window at the bottom of the selected frame.
|
||
Another useful value is ‘(display-buffer-below-selected)’. This is
|
||
what ‘magit-popup’ used by default. For more alternatives see
|
||
*note (elisp)Display Action Functions::.
|
||
|
||
It may be possible to display the window in another frame, but
|
||
whether that works in practice depends on the window-manager. If
|
||
the window manager selects the new window (Emacs frame), then it
|
||
doesn’t work.
|
||
|
||
If you change the value of this option, then you might also want to
|
||
change the value of ‘transient-mode-line-format’.
|
||
|
||
-- User Option: transient-mode-line-format
|
||
|
||
This option controls whether the transient popup buffer has a
|
||
mode-line, separator line, or neither.
|
||
|
||
If ‘nil’, then the buffer has no mode-line. If the buffer is not
|
||
displayed right above the echo area, then this probably is not a
|
||
good value.
|
||
|
||
If ‘line’ (the default), then the buffer also has no mode-line, but
|
||
a thin line is drawn instead, using the background color of the
|
||
face ‘transient-separator’. Termcap frames cannot display thin
|
||
lines and therefore fallback to treating ‘line’ like ‘nil’.
|
||
|
||
Otherwise this can be any mode-line format. See *note (elisp)Mode
|
||
Line Format:: for details.
|
||
|
||
-- User Option: transient-read-with-initial-input
|
||
|
||
This option controls whether the last history element is used as
|
||
the initial minibuffer input when reading the value of an infix
|
||
argument from the user. If ‘nil’, then there is no initial input
|
||
and the first element has to be accessed the same way as the older
|
||
elements.
|
||
|
||
-- User Option: transient-highlight-mismatched-keys
|
||
|
||
This option controls whether key bindings of infix commands that do
|
||
not match the respective command-line argument should be
|
||
highlighted. For other infix commands this option has no effect.
|
||
|
||
When this option is non-nil, then the key binding for an infix
|
||
argument is highlighted when only a long argument (e.g.
|
||
‘--verbose’) is specified but no shorthand (e.g ‘-v’). In the rare
|
||
case that a shorthand is specified but the key binding does not
|
||
match, then it is highlighted differently.
|
||
|
||
Highlighting mismatched key bindings is useful when learning the
|
||
arguments of the underlying command-line tool; you wouldn’t want to
|
||
learn any short-hands that do not actually exist.
|
||
|
||
The highlighting is done using one of the faces
|
||
‘transient-mismatched-key’ and ‘transient-nonstandard-key’.
|
||
|
||
-- User Option: transient-substitute-key-function
|
||
|
||
This function is used to modify key bindings. If the value of this
|
||
option is nil (the default), then no substitution is performed.
|
||
|
||
This function is called with one argument, the prefix object, and
|
||
must return a key binding description, either the existing key
|
||
description it finds in the ‘key’ slot, or the key description that
|
||
replaces the prefix key. It could be used to make other
|
||
substitutions, but that is discouraged.
|
||
|
||
For example, ‘=’ is hard to reach using my custom keyboard layout,
|
||
so I substitute ‘(’ for that, which is easy to reach using a layout
|
||
optimized for lisp.
|
||
|
||
(setq transient-substitute-key-function
|
||
(lambda (obj)
|
||
(let ((key (oref obj key)))
|
||
(if (string-match "\\`\\(=\\)[a-zA-Z]" key)
|
||
(replace-match "(" t t key 1)
|
||
key))))
|
||
|
||
-- User Option: transient-detect-key-conflicts
|
||
|
||
This option controls whether key binding conflicts should be
|
||
detected at the time the transient is invoked. If so, then this
|
||
results in an error, which prevents the transient from being used.
|
||
Because of that, conflicts are ignored by default.
|
||
|
||
Conflicts cannot be determined earlier, i.e. when the transient is
|
||
being defined and when new suffixes are being added, because at
|
||
that time there can be false-positives. It is actually valid for
|
||
multiple suffixes to share a common key binding, provided the
|
||
predicates of those suffixes prevent that more than one of them is
|
||
enabled at a time.
|
||
|
||
-- User Option: transient-force-fixed-pitch
|
||
|
||
This option controls whether to force the use of a monospaced font
|
||
in popup buffer. Even if you use a proportional font for the
|
||
‘default’ face, you might still want to use a monospaced font in
|
||
transient’s popup buffer. Setting this option to t causes
|
||
‘default’ to be remapped to ‘fixed-pitch’ in that buffer.
|
||
|
||
|
||
File: transient.info, Node: Modifying Existing Transients, Next: Defining New Commands, Prev: Other Options, Up: Top
|
||
|
||
4 Modifying Existing Transients
|
||
*******************************
|
||
|
||
To an extent transients can be customized interactively, see *note
|
||
Enabling and Disabling Suffixes::. This section explains how existing
|
||
transients can be further modified non-interactively.
|
||
|
||
The following functions share a few arguments:
|
||
|
||
• PREFIX is a transient prefix command, a symbol.
|
||
|
||
• SUFFIX is a transient infix or suffix specification in the same
|
||
form as expected by ‘transient-define-prefix’. Note that an infix
|
||
is a special kind of suffix. Depending on context "suffixes" means
|
||
"suffixes (including infixes)" or "non-infix suffixes". Here it
|
||
means the former. See *note Suffix Specifications::.
|
||
|
||
SUFFIX may also be a group in the same form as expected by
|
||
‘transient-define-prefix’. See *note Group Specifications::.
|
||
|
||
• LOC is a command, a key vector, a key description (a string as
|
||
returned by ‘key-description’), or a list specifying coordinates
|
||
(the last element may also be a command or key). For example ‘(1 0
|
||
-1)’ identifies the last suffix (‘-1’) of the first subgroup (‘0’)
|
||
of the second group (‘1’).
|
||
|
||
If LOC is a list of coordinates, then it can be used to identify a
|
||
group, not just an individual suffix command.
|
||
|
||
The function ‘transient-get-suffix’ can be useful to determine
|
||
whether a certain coordination list identifies the suffix or group
|
||
that you expect it to identify. In hairy cases it may be necessary
|
||
to look at the definition of the transient prefix command.
|
||
|
||
These functions operate on the information stored in the
|
||
‘transient--layout’ property of the PREFIX symbol. Suffix entries in
|
||
that tree are not objects but have the form ‘(LEVEL CLASS PLIST)’, where
|
||
plist should set at least ‘:key’, ‘:description’ and ‘:command’.
|
||
|
||
-- Function: transient-insert-suffix prefix loc suffix
|
||
|
||
This function inserts suffix or group SUFFIX into PREFIX before
|
||
LOC.
|
||
|
||
-- Function: transient-append-suffix prefix loc suffix
|
||
|
||
This function inserts suffix or group SUFFIX into PREFIX after LOC.
|
||
|
||
-- Function: transient-replace-suffix prefix loc suffix
|
||
|
||
This function replaces the suffix or group at LOC in PREFIX with
|
||
suffix or group SUFFIX.
|
||
|
||
-- Function: transient-remove-suffix prefix loc
|
||
|
||
This function removes the suffix or group at LOC in PREFIX.
|
||
|
||
-- Function: transient-get-suffix prefix loc
|
||
|
||
This function returns the suffix or group at LOC in PREFIX. The
|
||
returned value has the form mentioned above.
|
||
|
||
-- Function: transient-suffix-put prefix loc prop value
|
||
|
||
This function edits the suffix or group at LOC in PREFIX, by
|
||
setting the PROP of its plist to VALUE.
|
||
|
||
Most of these functions do not signal an error if they cannot perform
|
||
the requested modification. The functions that insert new suffixes show
|
||
a warning if LOC cannot be found in PREFIX, without signaling an error.
|
||
The reason for doing it like this is that establishing a key binding
|
||
(and that is what we essentially are trying to do here) should not
|
||
prevent the rest of the configuration from loading. Among these
|
||
functions only ‘transient-get-suffix’ and ‘transient-suffix-put’ may
|
||
signal an error.
|
||
|
||
|
||
File: transient.info, Node: Defining New Commands, Next: Classes and Methods, Prev: Modifying Existing Transients, Up: Top
|
||
|
||
5 Defining New Commands
|
||
***********************
|
||
|
||
* Menu:
|
||
|
||
* Defining Transients::
|
||
* Binding Suffix and Infix Commands::
|
||
* Defining Suffix and Infix Commands::
|
||
* Using Infix Arguments::
|
||
* Transient State::
|
||
|
||
|
||
File: transient.info, Node: Defining Transients, Next: Binding Suffix and Infix Commands, Up: Defining New Commands
|
||
|
||
5.1 Defining Transients
|
||
=======================
|
||
|
||
A transient consists of a prefix command and at least one suffix
|
||
command, though usually a transient has several infix and suffix
|
||
commands. The below macro defines the transient prefix command *and*
|
||
binds the transient’s infix and suffix commands. In other words, it
|
||
defines the complete transient, not just the transient prefix command
|
||
that is used to invoke that transient.
|
||
|
||
-- Macro: transient-define-prefix name arglist [docstring] [keyword
|
||
value]... group... [body...]
|
||
|
||
This macro defines NAME as a transient prefix command and binds the
|
||
transient’s infix and suffix commands.
|
||
|
||
ARGLIST are the arguments that the prefix command takes. DOCSTRING
|
||
is the documentation string and is optional.
|
||
|
||
These arguments can optionally be followed by keyword-value pairs.
|
||
Each key has to be a keyword symbol, either ‘:class’ or a keyword
|
||
argument supported by the constructor of that class. The
|
||
‘transient-prefix’ class is used if the class is not specified
|
||
explicitly.
|
||
|
||
GROUPs add key bindings for infix and suffix commands and specify
|
||
how these bindings are presented in the popup buffer. At least one
|
||
GROUP has to be specified. See *note Binding Suffix and Infix
|
||
Commands::.
|
||
|
||
The BODY is optional. If it is omitted, then ARGLIST is ignored
|
||
and the function definition becomes:
|
||
|
||
(lambda ()
|
||
(interactive)
|
||
(transient-setup 'NAME))
|
||
|
||
If BODY is specified, then it must begin with an ‘interactive’ form
|
||
that matches ARGLIST, and it must call ‘transient-setup’. It may
|
||
however call that function only when some condition is satisfied.
|
||
|
||
All transients have a (possibly ‘nil’) value, which is exported
|
||
when suffix commands are called, so that they can consume that
|
||
value. For some transients it might be necessary to have a sort of
|
||
secondary value, called a "scope". Such a scope would usually be
|
||
set in the command’s ‘interactive’ form and has to be passed to the
|
||
setup function:
|
||
|
||
(transient-setup 'NAME nil nil :scope SCOPE)
|
||
|
||
For example, the scope of the ‘magit-branch-configure’ transient is
|
||
the branch whose variables are being configured.
|
||
|
||
|
||
File: transient.info, Node: Binding Suffix and Infix Commands, Next: Defining Suffix and Infix Commands, Prev: Defining Transients, Up: Defining New Commands
|
||
|
||
5.2 Binding Suffix and Infix Commands
|
||
=====================================
|
||
|
||
The macro ‘transient-define-prefix’ is used to define a transient. This
|
||
defines the actual transient prefix command (see *note Defining
|
||
Transients::) and adds the transient’s infix and suffix bindings, as
|
||
described below.
|
||
|
||
Users and third-party packages can add additional bindings using
|
||
functions such as ‘transient-insert-suffix’ (See *note Modifying
|
||
Existing Transients::). These functions take a "suffix specification"
|
||
as one of their arguments, which has the same form as the specifications
|
||
used in ‘transient-define-prefix’.
|
||
|
||
* Menu:
|
||
|
||
* Group Specifications::
|
||
* Suffix Specifications::
|
||
|
||
|
||
File: transient.info, Node: Group Specifications, Next: Suffix Specifications, Up: Binding Suffix and Infix Commands
|
||
|
||
5.2.1 Group Specifications
|
||
--------------------------
|
||
|
||
The suffix and infix commands of a transient are organized in groups.
|
||
The grouping controls how the descriptions of the suffixes are outlined
|
||
visually but also makes it possible to set certain properties for a set
|
||
of suffixes.
|
||
|
||
Several group classes exist, some of which organize suffixes in
|
||
subgroups. In most cases the class does not have to be specified
|
||
explicitly, but see *note Group Classes::.
|
||
|
||
Groups are specified in the call to ‘transient-define-prefix’, using
|
||
vectors. Because groups are represented using vectors, we cannot use
|
||
square brackets to indicate an optional element and instead use curly
|
||
brackets to do the latter.
|
||
|
||
Group specifications then have this form:
|
||
|
||
[{LEVEL} {DESCRIPTION} {KEYWORD VALUE}... ELEMENT...]
|
||
|
||
The LEVEL is optional and defaults to 4. See *note Enabling and
|
||
Disabling Suffixes::.
|
||
|
||
The DESCRIPTION is optional. If present it is used as the heading of
|
||
the group.
|
||
|
||
The KEYWORD-VALUE pairs are optional. Each keyword has to be a
|
||
keyword symbol, either ‘:class’ or a keyword argument supported by the
|
||
constructor of that class.
|
||
|
||
• One of these keywords, ‘:description’, is equivalent to specifying
|
||
DESCRIPTION at the very beginning of the vector. The
|
||
recommendation is to use ‘:description’ if some other keyword is
|
||
also used, for consistency, or DESCRIPTION otherwise, because it
|
||
looks better.
|
||
|
||
• Likewise ‘:level’ is equivalent to LEVEL.
|
||
|
||
• Other important keywords include the ‘:if...’ keywords. These
|
||
keywords control whether the group is available in a certain
|
||
situation.
|
||
|
||
For example, one group of the ‘magit-rebase’ transient uses ‘:if
|
||
magit-rebase-in-progress-p’, which contains the suffixes that are
|
||
useful while rebase is already in progress; and another that uses
|
||
‘:if-not magit-rebase-in-progress-p’, which contains the suffixes
|
||
that initiate a rebase.
|
||
|
||
These predicates can also be used on individual suffixes and are
|
||
only documented once, see *note Predicate Slots::.
|
||
|
||
• Finally the value of ‘:hide’, if non-nil, is a predicate that
|
||
controls whether the group is hidden by default. The key bindings
|
||
for suffixes of a hidden group should all use the same prefix key.
|
||
Pressing that prefix key should temporarily show the group and its
|
||
suffixes, which assumes that a predicate like this is used:
|
||
|
||
(lambda ()
|
||
(eq (car transient--redisplay-key)
|
||
?\C-c)) ; the prefix key shared by all bindings
|
||
|
||
The ELEMENTs are either all subgroups (vectors), or all suffixes
|
||
(lists) and strings. (At least currently no group type exists that
|
||
would allow mixing subgroups with commands at the same level, though in
|
||
principle there is nothing that prevents that.)
|
||
|
||
If the ELEMENTs are not subgroups, then they can be a mixture of
|
||
lists that specify commands and strings. Strings are inserted verbatim.
|
||
The empty string can be used to insert gaps between suffixes, which is
|
||
particularly useful if the suffixes are outlined as a table.
|
||
|
||
The form of suffix specifications is documented in the next node.
|
||
|
||
|
||
File: transient.info, Node: Suffix Specifications, Prev: Group Specifications, Up: Binding Suffix and Infix Commands
|
||
|
||
5.2.2 Suffix Specifications
|
||
---------------------------
|
||
|
||
A transient’s suffix and infix commands are bound when the transient
|
||
prefix command is defined using ‘transient-define-prefix’, see *note
|
||
Defining Transients::. The commands are organized into groups, see
|
||
*note Group Specifications::. Here we describe the form used to bind an
|
||
individual suffix command.
|
||
|
||
The same form is also used when later binding additional commands
|
||
using functions such as ‘transient-insert-suffix’, see *note Modifying
|
||
Existing Transients::.
|
||
|
||
Note that an infix is a special kind of suffix. Depending on context
|
||
"suffixes" means "suffixes (including infixes)" or "non-infix suffixes".
|
||
Here it means the former.
|
||
|
||
Suffix specifications have this form:
|
||
|
||
([LEVEL] [KEY] [DESCRIPTION] COMMAND|ARGUMENT [KEYWORD VALUE]...)
|
||
|
||
LEVEL, KEY and DESCRIPTION can also be specified using the KEYWORDs
|
||
‘:level’, ‘:key’ and ‘:description’. If the object that is associated
|
||
with COMMAND sets these properties, then they do not have to be
|
||
specified here. You can however specify them here anyway, possibly
|
||
overriding the object’s values just for the binding inside this
|
||
transient.
|
||
|
||
• LEVEL is the suffix level, an integer between 1 and 7. See *note
|
||
Enabling and Disabling Suffixes::.
|
||
|
||
• KEY is the key binding, either a vector or key description string.
|
||
|
||
• DESCRIPTION is the description, either a string or a function that
|
||
returns a string. The function should be a lambda expression to
|
||
avoid ambiguity. In some cases a symbol that is bound as a
|
||
function would also work but to be safe you should use
|
||
‘:description’ in that case.
|
||
|
||
The next element is either a command or an argument. This is the
|
||
only argument that is mandatory in all cases.
|
||
|
||
• COMMAND is a symbol that is bound as a function, which has to be a
|
||
command. Any command will do; it does not need to have an object
|
||
associated with it (as would be the case if
|
||
‘transient-define-suffix’ or ‘transient-define-infix’ were used to
|
||
define it).
|
||
|
||
As mentioned above, the object that is associated with a command
|
||
can be used to set the default for certain values that otherwise
|
||
have to be set in the suffix specification. Therefore if there is
|
||
no object, then you have to make sure to specify the KEY and the
|
||
DESCRIPTION.
|
||
|
||
• The mandatory argument can also be a command-line argument, a
|
||
string. In that case an anonymous command is defined and bound.
|
||
|
||
Instead of a string, this can also be a list of two strings, in
|
||
which case the first string is used as the short argument (which
|
||
can also be specified using ‘:shortarg’) and the second as the long
|
||
argument (which can also be specified using ‘:argument’).
|
||
|
||
Only the long argument is displayed in the popup buffer. See
|
||
‘transient-detect-key-conflicts’ for how the short argument may be
|
||
used.
|
||
|
||
Unless the class is specified explicitly, the appropriate class is
|
||
guessed based on the long argument. If the argument ends with "="
|
||
(e.g. "–format=") then ‘transient-option’ is used, otherwise
|
||
‘transient-switch’.
|
||
|
||
Finally, details can be specified using optional KEYWORD-VALUE pairs.
|
||
Each keyword has to be a keyword symbol, either ‘:class’ or a keyword
|
||
argument supported by the constructor of that class. See *note Suffix
|
||
Slots::.
|
||
|
||
|
||
File: transient.info, Node: Defining Suffix and Infix Commands, Next: Using Infix Arguments, Prev: Binding Suffix and Infix Commands, Up: Defining New Commands
|
||
|
||
5.3 Defining Suffix and Infix Commands
|
||
======================================
|
||
|
||
Note that an infix is a special kind of suffix. Depending on context
|
||
"suffixes" means "suffixes (including infixes)" or "non-infix suffixes".
|
||
|
||
-- Macro: transient-define-suffix name arglist [docstring] [keyword
|
||
value]... body...
|
||
|
||
This macro defines NAME as a transient suffix command.
|
||
|
||
ARGLIST are the arguments that the command takes. DOCSTRING is the
|
||
documentation string and is optional.
|
||
|
||
These arguments can optionally be followed by keyword-value pairs.
|
||
Each keyword has to be a keyword symbol, either ‘:class’ or a
|
||
keyword argument supported by the constructor of that class. The
|
||
‘transient-suffix’ class is used if the class is not specified
|
||
explicitly.
|
||
|
||
The BODY must begin with an ‘interactive’ form that matches
|
||
ARGLIST. The infix arguments are usually accessed by using
|
||
‘transient-args’ inside ‘interactive’.
|
||
|
||
-- Macro: transient-define-infix name arglist [docstring] [keyword
|
||
value]...
|
||
|
||
This macro defines NAME as a transient infix command.
|
||
|
||
ARGLIST is always ignored (but mandatory never-the-less) and
|
||
reserved for future use. DOCSTRING is the documentation string and
|
||
is optional.
|
||
|
||
The keyword-value pairs are mandatory. All transient infix
|
||
commands are ‘equal’ to each other (but not ‘eq’), so it is
|
||
meaningless to define an infix command without also setting at
|
||
least ‘:class’ and one other keyword (which it is depends on the
|
||
used class, usually ‘:argument’ or ‘:variable’).
|
||
|
||
Each keyword has to be a keyword symbol, either ‘:class’ or a
|
||
keyword argument supported by the constructor of that class. The
|
||
‘transient-switch’ class is used if the class is not specified
|
||
explicitly.
|
||
|
||
The function definition is always:
|
||
|
||
(lambda ()
|
||
(interactive)
|
||
(let ((obj (transient-suffix-object)))
|
||
(transient-infix-set obj (transient-infix-read obj)))
|
||
(transient--show))
|
||
|
||
‘transient-infix-read’ and ‘transient-infix-set’ are generic
|
||
functions. Different infix commands behave differently because the
|
||
concrete methods are different for different infix command classes.
|
||
In rare cases the above command function might not be suitable,
|
||
even if you define your own infix command class. In that case you
|
||
have to use ‘transient-suffix-command’ to define the infix command
|
||
and use ‘t’ as the value of the ‘:transient’ keyword.
|
||
|
||
-- Macro: transient-define-argument name arglist [docstring] [keyword
|
||
value]...
|
||
|
||
This macro defines NAME as a transient infix command.
|
||
|
||
This is an alias for ‘transient-define-infix’. Only use this alias
|
||
to define an infix command that actually sets an infix argument.
|
||
To define an infix command that, for example, sets a variable, use
|
||
‘transient-define-infix’ instead.
|
||
|
||
|
||
File: transient.info, Node: Using Infix Arguments, Next: Transient State, Prev: Defining Suffix and Infix Commands, Up: Defining New Commands
|
||
|
||
5.4 Using Infix Arguments
|
||
=========================
|
||
|
||
The function and the variables described below allow suffix commands to
|
||
access the value of the transient from which they were invoked; which is
|
||
the value of its infix arguments. These variables are set when the user
|
||
invokes a suffix command that exits the transient, but before actually
|
||
calling the command.
|
||
|
||
When returning to the command-loop after calling the suffix command,
|
||
the arguments are reset to ‘nil’ (which causes the function to return
|
||
‘nil’ too).
|
||
|
||
Like for Emacs’ prefix arguments it is advisable, but not mandatory,
|
||
to access the infix arguments inside the command’s ‘interactive’ form.
|
||
The preferred way of doing that is to call the ‘transient-args’
|
||
function, which for infix arguments serves about the same purpose as
|
||
‘prefix-arg’ serves for prefix arguments.
|
||
|
||
-- Function: transient-args &optional prefix
|
||
|
||
This function returns the value of the transient prefix command
|
||
PREFIX.
|
||
|
||
If the current command was invoked from the transient prefix
|
||
command PREFIX, then it returns the active infix arguments. If the
|
||
current command was not invoked from PREFIX, then it returns the
|
||
set, saved or default value for PREFIX.
|
||
|
||
-- Variable: transient-current-suffixes
|
||
|
||
The suffixes of the transient from which this suffix command was
|
||
invoked. This is a list of objects. Usually it is sufficient to
|
||
instead use the function ‘transient-args’, which returns a list of
|
||
values. In complex cases it might be necessary to use this
|
||
variable instead, i.e. if you need access to information beside
|
||
the value.
|
||
|
||
-- Variable: transient-current-prefix
|
||
|
||
The transient from which this suffix command was invoked. The
|
||
returned value is a ‘transient-prefix’ object, which holds
|
||
information associated with the transient prefix command.
|
||
|
||
-- Variable: transient-current-command
|
||
|
||
The transient from which this suffix command was invoked. The
|
||
returned value is a symbol, the transient prefix command.
|
||
|
||
|
||
File: transient.info, Node: Transient State, Prev: Using Infix Arguments, Up: Defining New Commands
|
||
|
||
5.5 Transient State
|
||
===================
|
||
|
||
Invoking a transient prefix command "activates" the respective
|
||
transient, i.e. it puts a transient keymap into effect, which binds the
|
||
transient’s infix and suffix commands.
|
||
|
||
The default behavior while a transient is active is as follows:
|
||
|
||
• Invoking an infix command does not affect the transient state; the
|
||
transient remains active.
|
||
|
||
• Invoking a (non-infix) suffix command "deactivates" the transient
|
||
state by removing the transient keymap and performing some
|
||
additional cleanup.
|
||
|
||
• Invoking a command that is bound in a keymap other than the
|
||
transient keymap is disallowed and trying to do so results in a
|
||
warning. This does not "deactivate" the transient.
|
||
|
||
But these are just the defaults. Whether a certain command
|
||
deactivates or "exits" the transient is configurable. There is more
|
||
than one way in which a command can be "transient" or "non-transient";
|
||
the exact behavior is implemented by calling a so-called "pre-command"
|
||
function. Whether non-suffix commands are allowed to be called is
|
||
configurable per transient.
|
||
|
||
• The transient-ness of suffix commands (including infix commands) is
|
||
controlled by the value of their ‘transient’ slot, which can be set
|
||
either when defining the command or when adding a binding to a
|
||
transient while defining the respective transient prefix command.
|
||
|
||
Valid values are booleans and the pre-commands described below.
|
||
|
||
• ‘t’ is equivalent to ‘transient--do-stay’.
|
||
|
||
• ‘nil’ is equivalent to ‘transient--do-exit’.
|
||
|
||
• If ‘transient’ is unbound (and that is actually the default
|
||
for non-infix suffixes) then the value of the prefix’s
|
||
‘transient-suffix’ slot is used instead. The default value of
|
||
that slot is ‘nil’, so the suffix’s ‘transient’ slot being
|
||
unbound is essentially equivalent to it being ‘nil’.
|
||
|
||
• A suffix command can be a prefix command itself, i.e. a
|
||
"sub-prefix". While a sub-prefix is active we nearly always want
|
||
‘C-g’ to take the user back to the "super-prefix". However in rare
|
||
cases this may not be desirable, and that makes the following
|
||
complication necessary:
|
||
|
||
For ‘transient-suffix’ objects the ‘transient’ slot is unbound. We
|
||
can ignore that for the most part because, as stated above, ‘nil’
|
||
and the slot being unbound are equivalent, and mean "do exit".
|
||
That isn’t actually true for suffixes that are sub-prefixes though.
|
||
For such suffixes unbound means "do exit but allow going back",
|
||
which is the default, while ‘nil’ means "do exit permanently",
|
||
which requires that slot to be explicitly set to that value.
|
||
|
||
• The transient-ness of certain built-in suffix commands is specified
|
||
using ‘transient-predicate-map’. This is a special keymap, which
|
||
binds commands to pre-commands (as opposed to keys to commands) and
|
||
takes precedence over the ‘transient’ slot.
|
||
|
||
The available pre-command functions are documented below. They are
|
||
called by ‘transient--pre-command’, a function on ‘pre-command-hook’ and
|
||
the value that they return determines whether the transient is exited.
|
||
To do so the value of one of the constants ‘transient--exit’ or
|
||
‘transient--stay’ is used (that way we don’t have to remember if ‘t’
|
||
means "exit" or "stay").
|
||
|
||
Additionally these functions may change the value of ‘this-command’
|
||
(which explains why they have to be called using ‘pre-command-hook’),
|
||
call ‘transient-export’, ‘transient--stack-zap’ or
|
||
‘transient--stack-push’; and set the values of ‘transient--exitp’,
|
||
‘transient--helpp’ or ‘transient--editp’.
|
||
|
||
5.5.1 Pre-commands for Infixes
|
||
------------------------------
|
||
|
||
The default for infixes is ‘transient--do-stay’. This is also the only
|
||
function that makes sense for infixes.
|
||
|
||
-- Function: transient--do-stay
|
||
|
||
Call the command without exporting variables and stay transient.
|
||
|
||
5.5.2 Pre-commands for Suffixes
|
||
-------------------------------
|
||
|
||
The default for suffixes is ‘transient--do-exit’.
|
||
|
||
-- Function: transient--do-exit
|
||
|
||
Call the command after exporting variables and exit the transient.
|
||
|
||
-- Function: transient--do-call
|
||
|
||
Call the command after exporting variables and stay transient.
|
||
|
||
-- Function: transient--do-replace
|
||
|
||
Call the transient prefix command, replacing the active transient.
|
||
|
||
This is used for suffixes that are prefixes themselves, i.e. for
|
||
sub-prefixes.
|
||
|
||
5.5.3 Pre-commands for Non-Suffixes
|
||
-----------------------------------
|
||
|
||
The default for non-suffixes, i.e commands that are bound in other
|
||
keymaps beside the transient keymap, is ‘transient--do-warn’. Silently
|
||
ignoring the user-error is also an option, though probably not a good
|
||
one.
|
||
|
||
If you want to let the user invoke non-suffix commands, then use
|
||
‘transient--do-stay’ as the value of the prefix’s ‘transient-non-suffix’
|
||
slot.
|
||
|
||
-- Function: transient--do-warn
|
||
|
||
Call ‘transient-undefined’ and stay transient.
|
||
|
||
-- Function: transient--do-noop
|
||
|
||
Call ‘transient-noop’ and stay transient.
|
||
|
||
5.5.4 Special Pre-Commands
|
||
--------------------------
|
||
|
||
-- Function: transient--do-quit-one
|
||
|
||
If active, quit help or edit mode, else exit the active transient.
|
||
|
||
This is used when the user pressed ‘C-g’.
|
||
|
||
-- Function: transient--do-quit-all
|
||
|
||
Exit all transients without saving the transient stack.
|
||
|
||
This is used when the user pressed ‘C-q’.
|
||
|
||
-- Function: transient--do-suspend
|
||
|
||
Suspend the active transient, saving the transient stack.
|
||
|
||
This is used when the user pressed ‘C-z’.
|
||
|
||
|
||
File: transient.info, Node: Classes and Methods, Next: Related Abstractions and Packages, Prev: Defining New Commands, Up: Top
|
||
|
||
6 Classes and Methods
|
||
*********************
|
||
|
||
Transient uses classes and generic functions to make it possible to
|
||
define new types of suffix commands that are similar to existing types,
|
||
but behave differently in some aspects. It does the same for groups and
|
||
prefix commands, though at least for prefix commands that *currently*
|
||
appears to be less important.
|
||
|
||
Every prefix, infix and suffix command is associated with an object,
|
||
which holds information that controls certain aspects of its behavior.
|
||
This happens in two ways.
|
||
|
||
• Associating a command with a certain class gives the command a
|
||
type. This makes it possible to use generic functions to do
|
||
certain things that have to be done differently depending on what
|
||
type of command it acts on.
|
||
|
||
That in turn makes it possible for third-parties to add new types
|
||
without having to convince the maintainer of Transient that that
|
||
new type is important enough to justify adding a special case to a
|
||
dozen or so functions.
|
||
|
||
• Associating a command with an object makes it possible to easily
|
||
store information that is specific to that particular command.
|
||
|
||
Two commands may have the same type, but obviously their key
|
||
bindings and descriptions still have to be different, for example.
|
||
|
||
The values of some slots are functions. The ‘reader’ slot for
|
||
example holds a function that is used to read a new value for an
|
||
infix command. The values of such slots are regular functions.
|
||
|
||
Generic functions are used when a function should do something
|
||
different based on the type of the command, i.e. when all commands
|
||
of a certain type should behave the same way but different from the
|
||
behavior for other types. Object slots that hold a regular
|
||
function as value are used when the task that they perform is
|
||
likely to differ even between different commands of the same type.
|
||
|
||
* Menu:
|
||
|
||
* Group Classes::
|
||
* Group Methods::
|
||
* Prefix Classes::
|
||
* Suffix Classes::
|
||
* Suffix Methods::
|
||
* Prefix Slots::
|
||
* Suffix Slots::
|
||
* Predicate Slots::
|
||
|
||
|
||
File: transient.info, Node: Group Classes, Next: Group Methods, Up: Classes and Methods
|
||
|
||
6.1 Group Classes
|
||
=================
|
||
|
||
The type of a group can be specified using the ‘:class’ property at the
|
||
beginning of the class specification, e.g. ‘[:class transient-columns
|
||
...]’ in a call to ‘transient-define-prefix’.
|
||
|
||
• The abstract ‘transient-child’ class is the base class of both
|
||
‘transient-group’ (and therefore all groups) as well as of
|
||
‘transient-suffix’ (and therefore all suffix and infix commands).
|
||
|
||
This class exists because the elements (aka "children") of certain
|
||
groups can be other groups instead of suffix and infix commands.
|
||
|
||
• The abstract ‘transient-group’ class is the superclass of all other
|
||
group classes.
|
||
|
||
• The ‘transient-column’ class is the simplest group.
|
||
|
||
This is the default "flat" group. If the class is not specified
|
||
explicitly and the first element is not a vector (i.e. not a
|
||
group), then this class is used.
|
||
|
||
This class displays each element on a separate line.
|
||
|
||
• The ‘transient-row’ class displays all elements on a single line.
|
||
|
||
• The ‘transient-columns’ class displays commands organized in
|
||
columns.
|
||
|
||
Direct elements have to be groups whose elements have to be
|
||
commands or strings. Each subgroup represents a column. This
|
||
class takes care of inserting the subgroups’ elements.
|
||
|
||
This is the default "nested" group. If the class is not specified
|
||
explicitly and the first element is a vector (i.e. a group), then
|
||
this class is used.
|
||
|
||
• The ‘transient-subgroups’ class wraps other groups.
|
||
|
||
Direct elements have to be groups whose elements have to be
|
||
commands or strings. This group inserts an empty line between
|
||
subgroups. The subgroups themselves are responsible for displaying
|
||
their elements.
|
||
|
||
|
||
File: transient.info, Node: Group Methods, Next: Prefix Classes, Prev: Group Classes, Up: Classes and Methods
|
||
|
||
6.2 Group Methods
|
||
=================
|
||
|
||
-- Function: transient--insert-group group
|
||
|
||
This generic function formats the group and its elements and
|
||
inserts the result into the current buffer, which is a temporary
|
||
buffer. The contents of that buffer are later inserted into the
|
||
popup buffer.
|
||
|
||
Functions that are called by this function may need to operate in
|
||
the buffer from which the transient was called. To do so they can
|
||
temporarily make the ‘transient--source-buffer’ the current buffer.
|
||
|
||
|
||
File: transient.info, Node: Prefix Classes, Next: Suffix Classes, Prev: Group Methods, Up: Classes and Methods
|
||
|
||
6.3 Prefix Classes
|
||
==================
|
||
|
||
Currently the ‘transient-prefix’ class is being used for all prefix
|
||
commands and there is only a single generic function that can be
|
||
specialized based on the class of a prefix command.
|
||
|
||
-- Function: transient--history-init obj
|
||
|
||
This generic function is called while setting up the transient and
|
||
is responsible for initializing the ‘history’ slot. This is the
|
||
transient-wide history; many individual infixes also have a history
|
||
of their own.
|
||
|
||
The default (and currently only) method extracts the value from the
|
||
global variable ‘transient-history’.
|
||
|
||
A transient prefix command’s object is stored in the
|
||
‘transient--prefix’ property of the command symbol. While a transient
|
||
is active, a clone of that object is stored in the variable
|
||
‘transient--prefix’. A clone is used because some changes that are made
|
||
to the active transient’s object should not affect later invocations.
|
||
|
||
|
||
File: transient.info, Node: Suffix Classes, Next: Suffix Methods, Prev: Prefix Classes, Up: Classes and Methods
|
||
|
||
6.4 Suffix Classes
|
||
==================
|
||
|
||
• All suffix and infix classes derive from ‘transient-suffix’, which
|
||
in turn derives from ‘transient-child’, from which
|
||
‘transient-group’ also derives (see *note Group Classes::).
|
||
|
||
• All infix classes derive from the abstract ‘transient-infix’ class,
|
||
which in turn derives from the ‘transient-suffix’ class.
|
||
|
||
Infixes are a special type of suffixes. The primary difference is
|
||
that infixes always use the ‘transient--do-stay’ pre-command, while
|
||
non-infix suffixes use a variety of pre-commands (see *note
|
||
Transient State::). Doing that is most easily achieved by using
|
||
this class, though theoretically it would be possible to define an
|
||
infix class that does not do so. If you do that then you get to
|
||
implement many methods.
|
||
|
||
Also, infixes and non-infix suffixes are usually defined using
|
||
different macros (see *note Defining Suffix and Infix Commands::).
|
||
|
||
• Classes used for infix commands that represent arguments should be
|
||
derived from the abstract ‘transient-argument’ class.
|
||
|
||
• The ‘transient-switch’ class (or a derived class) is used for infix
|
||
arguments that represent command-line switches (arguments that do
|
||
not take a value).
|
||
|
||
• The ‘transient-option’ class (or a derived class) is used for infix
|
||
arguments that represent command-line options (arguments that do
|
||
take a value).
|
||
|
||
• The ‘transient-switches’ class can be used for a set of mutually
|
||
exclusive command-line switches.
|
||
|
||
• The ‘transient-files’ class can be used for a "–" argument that
|
||
indicates that all remaining arguments are files.
|
||
|
||
• Classes used for infix commands that represent variables should
|
||
derived from the abstract ‘transient-variables’ class.
|
||
|
||
Magit defines additional classes, which can serve as examples for the
|
||
fancy things you can do without modifying Transient. Some of these
|
||
classes will likely get generalized and added to Transient. For now
|
||
they are very much subject to change and not documented.
|
||
|
||
|
||
File: transient.info, Node: Suffix Methods, Next: Prefix Slots, Prev: Suffix Classes, Up: Classes and Methods
|
||
|
||
6.5 Suffix Methods
|
||
==================
|
||
|
||
To get information about the methods implementing these generic
|
||
functions use ‘describe-function’.
|
||
|
||
* Menu:
|
||
|
||
* Suffix Value Methods::
|
||
* Suffix Format Methods::
|
||
|
||
|
||
File: transient.info, Node: Suffix Value Methods, Next: Suffix Format Methods, Up: Suffix Methods
|
||
|
||
6.5.1 Suffix Value Methods
|
||
--------------------------
|
||
|
||
-- Function: transient-init-value obj
|
||
|
||
This generic function sets the initial value of the object OBJ.
|
||
|
||
This function is called for all suffix commands, but unless a
|
||
concrete method is implemented this falls through to the default
|
||
implementation, which is a noop. In other words this usually only
|
||
does something for infix commands, but note that this is not
|
||
implemented for the abstract class ‘transient-infix’, so if your
|
||
class derives from that directly, then you must implement a method.
|
||
|
||
-- Function: transient-infix-read obj
|
||
|
||
This generic function determines the new value of the infix object
|
||
OBJ.
|
||
|
||
This function merely determines the value; ‘transient-infix-set’ is
|
||
used to actually store the new value in the object.
|
||
|
||
For most infix classes this is done by reading a value from the
|
||
user using the reader specified by the ‘reader’ slot (using the
|
||
‘transient-infix-value’ method described below).
|
||
|
||
For some infix classes the value is changed without reading
|
||
anything in the minibuffer, i.e. the mere act of invoking the
|
||
infix command determines what the new value should be, based on the
|
||
previous value.
|
||
|
||
-- Function: transient-prompt obj
|
||
|
||
This generic function returns the prompt to be used to read infix
|
||
object OBJ’s value.
|
||
|
||
-- Function: transient-infix-set obj value
|
||
|
||
This generic function sets the value of infix object OBJ to VALUE.
|
||
|
||
-- Function: transient-infix-value obj
|
||
|
||
This generic function returns the value of the suffix object OBJ.
|
||
|
||
This function is called by ‘transient-args’ (which see), meaning
|
||
this function is how the value of a transient is determined so that
|
||
the invoked suffix command can use it.
|
||
|
||
Currently most values are strings, but that is not set in stone.
|
||
‘nil’ is not a value, it means "no value".
|
||
|
||
Usually only infixes have a value, but see the method for
|
||
‘transient-suffix’.
|
||
|
||
-- Function: transient-init-scope obj
|
||
|
||
This generic function sets the scope of the suffix object OBJ.
|
||
|
||
The scope is actually a property of the transient prefix, not of
|
||
individual suffixes. However it is possible to invoke a suffix
|
||
command directly instead of from a transient. In that case, if the
|
||
suffix expects a scope, then it has to determine that itself and
|
||
store it in its ‘scope’ slot.
|
||
|
||
This function is called for all suffix commands, but unless a
|
||
concrete method is implemented this falls through to the default
|
||
implementation, which is a noop.
|
||
|
||
|
||
File: transient.info, Node: Suffix Format Methods, Prev: Suffix Value Methods, Up: Suffix Methods
|
||
|
||
6.5.2 Suffix Format Methods
|
||
---------------------------
|
||
|
||
-- Function: transient-format obj
|
||
|
||
This generic function formats and returns OBJ for display.
|
||
|
||
When this function is called, then the current buffer is some
|
||
temporary buffer. If you need the buffer from which the prefix
|
||
command was invoked to be current, then do so by temporarily making
|
||
‘transient--source-buffer’ current.
|
||
|
||
-- Function: transient-format-key obj
|
||
|
||
This generic function formats OBJ’s ‘key’ for display and returns
|
||
the result.
|
||
|
||
-- Function: transient-format-description obj
|
||
|
||
This generic function formats OBJ’s ‘description’ for display and
|
||
returns the result.
|
||
|
||
-- Function: transient-format-value obj
|
||
|
||
This generic function formats OBJ’s value for display and returns
|
||
the result.
|
||
|
||
-- Function: transient-show-help obj
|
||
|
||
Show help for the prefix, infix or suffix command represented by
|
||
OBJ.
|
||
|
||
For prefixes, show the info manual, if that is specified using the
|
||
‘info-manual’ slot. Otherwise show the manpage if that is
|
||
specified using the ‘man-page’ slot. Otherwise show the command’s
|
||
doc string.
|
||
|
||
For suffixes, show the command’s doc string.
|
||
|
||
For infixes, show the manpage if that is specified. Otherwise show
|
||
the command’s doc string.
|
||
|
||
|
||
File: transient.info, Node: Prefix Slots, Next: Suffix Slots, Prev: Suffix Methods, Up: Classes and Methods
|
||
|
||
6.6 Prefix Slots
|
||
================
|
||
|
||
• ‘man-page’ or ‘info-manual’ can be used to specify the
|
||
documentation for the prefix and its suffixes. The command
|
||
‘transient-help’ uses the method ‘transient-show-help’ (which see)
|
||
to lookup and use these values.
|
||
|
||
• ‘history-key’ If multiple prefix commands should share a single
|
||
value, then this slot has to be set to the same value for all of
|
||
them. You probably don’t want that.
|
||
|
||
• ‘transient-suffix’ and ‘transient-non-suffix’ play a part when
|
||
determining whether the currently active transient prefix command
|
||
remains active/transient when a suffix or abitrary non-suffix
|
||
command is invoked. See *note Transient State::.
|
||
|
||
• ‘incompatible’ A list of lists. Each sub-list specifies a set of
|
||
mutually exclusive arguments. Enabling one of these arguments
|
||
causes the others to be disabled.
|
||
|
||
• ‘scope’ For some transients it might be necessary to have a sort of
|
||
secondary value, called a "scope". See ‘transient-define-prefix’.
|
||
|
||
6.6.1 Internal Prefix Slots
|
||
---------------------------
|
||
|
||
These slots are mostly intended for internal use. They should not be
|
||
set in calls to ‘transient-define-prefix’.
|
||
|
||
• ‘prototype’ When a transient prefix command is invoked, then a
|
||
clone of that object is stored in the global variable
|
||
‘transient--prefix’ and the prototype is stored in the clone’s
|
||
‘prototype’ slot.
|
||
|
||
• ‘command’ The command, a symbol. Each transient prefix command
|
||
consists of a command, which is stored in a symbol’s function slot
|
||
and an object, which is stored in the ‘transient--prefix’ property
|
||
of the same symbol.
|
||
|
||
• ‘level’ The level of the prefix commands. The suffix commands
|
||
whose layer is equal or lower are displayed. See *note Enabling
|
||
and Disabling Suffixes::.
|
||
|
||
• ‘value’ The likely outdated value of the prefix. Instead of
|
||
accessing this slot directly you should use the function
|
||
‘transient-get-value’, which is guaranteed to return the up-to-date
|
||
value.
|
||
|
||
• ‘history’ and ‘history-pos’ are used to keep track of historic
|
||
values. Unless you implement your own ‘transient-infix-read’
|
||
method you should not have to deal with these slots.
|
||
|
||
|
||
File: transient.info, Node: Suffix Slots, Next: Predicate Slots, Prev: Prefix Slots, Up: Classes and Methods
|
||
|
||
6.7 Suffix Slots
|
||
================
|
||
|
||
Here we document most of the slots that are only available for suffix
|
||
objects. Some slots are shared by suffix and group objects, they are
|
||
documented in *note Predicate Slots::.
|
||
|
||
Also see *note Suffix Classes::.
|
||
|
||
6.7.1 Slots of ‘transient-suffix’
|
||
---------------------------------
|
||
|
||
• ‘key’ The key, a key vector or a key description string.
|
||
|
||
• ‘command’ The command, a symbol.
|
||
|
||
• ‘transient’ Whether to stay transient. See *note Transient
|
||
State::.
|
||
|
||
• ‘format’ The format used to display the suffix in the popup buffer.
|
||
It must contain the following %-placeholders:
|
||
|
||
• ‘%k’ For the key.
|
||
|
||
• ‘%d’ For the description.
|
||
|
||
• ‘%v’ For the infix value. Non-infix suffixes don’t have a
|
||
value.
|
||
|
||
• ‘description’ The description, either a string or a function that
|
||
is called with no argument and returns a string.
|
||
|
||
6.7.2 Slots of ‘transient-infix’
|
||
--------------------------------
|
||
|
||
Some of these slots are only meaningful for some of the subclasses.
|
||
They are defined here anyway to allow sharing certain methods.
|
||
|
||
• ‘argument’ The long argument, e.g. ‘--verbose’.
|
||
|
||
• ‘shortarg’ The short argument, e.g. ‘-v’.
|
||
|
||
• ‘multi-value’ For options, whether the option can have multiple
|
||
values. If non-nil, then default to use
|
||
‘completing-read-multiple’.
|
||
|
||
• ‘allow-empty’ For options, whether the empty string is a valid
|
||
value.
|
||
|
||
• ‘history-key’ The key used to store the history. This defaults to
|
||
the command name. This is useful when multiple infixes should
|
||
share the same history because their values are of the same kind.
|
||
|
||
• ‘reader’ The function used to read the value of an infix. Not used
|
||
for switches. The function takes three arguments, PROMPT,
|
||
INITIAL-INPUT and HISTORY, and must return a string.
|
||
|
||
• ‘prompt’ The prompt used when reading the value, either a string or
|
||
a function that takes the object as the only argument and which
|
||
returns a prompt string.
|
||
|
||
• ‘choices’ A list of valid values. How exactly that is used depends
|
||
on the class of the object.
|
||
|
||
6.7.3 Slots of ‘transient-variable’
|
||
-----------------------------------
|
||
|
||
• ‘variable’ The variable.
|
||
|
||
6.7.4 Slots of ‘transient-switches’
|
||
-----------------------------------
|
||
|
||
• ‘argument-format’ The display format. Must contain ‘%s’, one of
|
||
the ‘choices’ is substituted for that. E.g. ‘--%s-order’.
|
||
|
||
• ‘argument-regexp’ The regexp used to match any one of the switches.
|
||
E.g. ‘\\(--\\(topo\\|author-date\\|date\\)-order\\)’.
|
||
|
||
|
||
File: transient.info, Node: Predicate Slots, Prev: Suffix Slots, Up: Classes and Methods
|
||
|
||
6.8 Predicate Slots
|
||
===================
|
||
|
||
Suffix and group objects share some predicate slots that control whether
|
||
a group or suffix should be available depending on some state. Only one
|
||
of these slots can be used at the same time. It is undefined what
|
||
happens if you use more than one.
|
||
|
||
• ‘if’ Enable if predicate returns non-nil.
|
||
|
||
• ‘if-not’ Enable if predicate returns nil.
|
||
|
||
• ‘if-non-nil’ Enable if variable’s value is non-nil.
|
||
|
||
• ‘if-nil’ Enable if variable’s value is nil.
|
||
|
||
• ‘if-mode’ Enable if major-mode matches value.
|
||
|
||
• ‘if-not-mode’ Enable if major-mode does not match value.
|
||
|
||
• ‘if-derived’ Enable if major-mode derives from value.
|
||
|
||
• ‘if-not-derived’ Enable if major-mode does not derive from value.
|
||
|
||
One more slot is shared between group and suffix classes, ‘level’.
|
||
Like the slots documented above, it is a predicate, but it is used for a
|
||
different purpose. The value has to be an integer between 1 and 7.
|
||
‘level’ controls whether a suffix or a group should be available
|
||
depending on user preference. See *note Enabling and Disabling
|
||
Suffixes::.
|
||
|
||
|
||
File: transient.info, Node: Related Abstractions and Packages, Next: FAQ, Prev: Classes and Methods, Up: Top
|
||
|
||
7 Related Abstractions and Packages
|
||
***********************************
|
||
|
||
* Menu:
|
||
|
||
* Comparison With Prefix Keys and Prefix Arguments::
|
||
* Comparison With Other Packages::
|
||
|
||
|
||
File: transient.info, Node: Comparison With Prefix Keys and Prefix Arguments, Next: Comparison With Other Packages, Up: Related Abstractions and Packages
|
||
|
||
7.1 Comparison With Prefix Keys and Prefix Arguments
|
||
====================================================
|
||
|
||
While transient commands were inspired by regular prefix keys and prefix
|
||
arguments, they are also quite different and much more complex.
|
||
|
||
The following diagrams illustrate some of the differences.
|
||
|
||
• ‘(c)’ represents a return to the command loop.
|
||
|
||
• ‘(+)’ represents the user’s choice to press one key or another.
|
||
|
||
• ‘{WORD}’ are possible behaviors.
|
||
|
||
• ‘{NUMBER}’ is a footnote.
|
||
|
||
7.1.1 Regular Prefix Commands
|
||
-----------------------------
|
||
|
||
See *note (elisp)Prefix Keys::.
|
||
|
||
,--> command1 --> (c)
|
||
|
|
||
(c)-(+)-> prefix command or key --+--> command2 --> (c)
|
||
|
|
||
`--> command3 --> (c)
|
||
|
||
7.1.2 Regular Prefix Arguments
|
||
------------------------------
|
||
|
||
See *note (elisp)Prefix Command Arguments::.
|
||
|
||
,----------------------------------,
|
||
| |
|
||
v |
|
||
(c)-(+)---> prefix argument command --(c)-(+)-> any command --> (c)
|
||
| ^ |
|
||
| | |
|
||
`-- sets or changes --, ,-- maybe used --' |
|
||
| | |
|
||
v | |
|
||
prefix argument state |
|
||
^ |
|
||
| |
|
||
`-------- discards --------'
|
||
|
||
7.1.3 Transients
|
||
----------------
|
||
|
||
(∩｀-´)⊃━☆ﾟ.*･｡ﾟ
|
||
|
||
This diagram ignores the infix value and external state:
|
||
|
||
(c)
|
||
| ,- {stay} ------<-,-<------------<-,-<---,
|
||
(+) | | | |
|
||
| | | | |
|
||
| | ,--> infix1 --| | |
|
||
| | | | | |
|
||
| | |--> infix2 --| | |
|
||
v v | | | |
|
||
prefix -(c)-(+)-> infix3 --' ^ |
|
||
| | |
|
||
|---------------> suffix1 -->--| |
|
||
| | |
|
||
|---------------> suffix2 ----{1}------> {exit} --> (c)
|
||
| |
|
||
|---------------> suffix3 -------------> {exit} --> (c)
|
||
| |
|
||
`--> any command --{2}-> {warn} -->--|
|
||
| |
|
||
|--> {noop} -->--|
|
||
| |
|
||
|--> {call} -->--'
|
||
|
|
||
`------------------> {exit} --> (c)
|
||
|
||
This diagram takes the infix value into account to an extend, while
|
||
still ignoring external state:
|
||
|
||
(c)
|
||
| ,- {stay} ------<-,-<------------<-,-<---,
|
||
(+) | | | |
|
||
| | | | |
|
||
| | ,--> infix1 --| | |
|
||
| | | | | | |
|
||
| | ,--> infix2 --| | |
|
||
v v | | | | |
|
||
prefix -(c)-(+)-> infix3 --' | |
|
||
| | ^ |
|
||
| | | |
|
||
|---------------> suffix1 -->--| |
|
||
| | ^ | |
|
||
| | | | |
|
||
|---------------> suffix2 ----{1}------> {exit} --> (c)
|
||
| | ^ | |
|
||
| | | | v
|
||
| | | | |
|
||
|---------------> suffix3 -------------> {exit} --> (c)
|
||
| | ^ | |
|
||
| sets | | v
|
||
| | maybe | |
|
||
| | used | |
|
||
| | | | |
|
||
| | infix --' | |
|
||
| `---> value | |
|
||
| ^ | |
|
||
| | | |
|
||
| hides | |
|
||
| | | |
|
||
| `--------------------------<---|
|
||
| | |
|
||
`--> any command --{2}-> {warn} -->--| |
|
||
| | |
|
||
|--> {noop} -->--| |
|
||
| | |
|
||
|--> {call} -->--' ^
|
||
| |
|
||
`------------------> {exit} --> (c)
|
||
|
||
This diagram provides more information about the infix value and also
|
||
takes external state into account.
|
||
|
||
,----sets--- "anything"
|
||
|
|
||
v
|
||
,---------> external
|
||
| state
|
||
| | |
|
||
| initialized | ☉‿⚆
|
||
sets from |
|
||
| | maybe
|
||
| ,----------' used
|
||
| | |
|
||
(c) | | v
|
||
| ,- {stay} --|---<-,-<------|-----<-,-<---,
|
||
(+) | | | | | | |
|
||
| | | v | | | |
|
||
| | ,--> infix1 --| | | |
|
||
| | | | | | | | |
|
||
| | | | v | | | |
|
||
| | ,--> infix2 --| | | |
|
||
| | | | ^ | | | |
|
||
v v | | | | | | |
|
||
prefix -(c)-(+)-> infix3 --' | | |
|
||
| | ^ | ^ |
|
||
| | | v | |
|
||
|---------------> suffix1 -->--| |
|
||
| | | ^ | | |
|
||
| | | | v | |
|
||
|---------------> suffix2 ----{1}------> {exit} --> (c)
|
||
| | | ^ | | |
|
||
| | | | | | v
|
||
| | | | v | |
|
||
|---------------> suffix3 -------------> {exit} --> (c)
|
||
| | | ^ | |
|
||
| sets | | | v
|
||
| | initialized maybe | |
|
||
| | from used | |
|
||
| | | | | |
|
||
| | `-- infix ---' | |
|
||
| `---> value -----------------------------> persistent
|
||
| ^ ^ | | across
|
||
| | | | | invocations -,
|
||
| hides | | | |
|
||
| | `----------------------------------------------'
|
||
| | | |
|
||
| `--------------------------<---|
|
||
| | |
|
||
`--> any command --{2}-> {warn} -->--| |
|
||
| | |
|
||
|--> {noop} -->--| |
|
||
| | |
|
||
|--> {call} -->--' ^
|
||
| |
|
||
`------------------> {exit} --> (c)
|
||
|
||
• ‘{1}’ Transients can be configured to be exited when a suffix
|
||
command is invoked. The default is to do so for all suffixes
|
||
except for those that are common to all transients and which are
|
||
used to perform tasks such as providing help and saving the value
|
||
of the infix arguments for future invocations. The behavior can
|
||
also be specified for individual suffix commands and may even
|
||
depend on state.
|
||
|
||
• ‘{2}’ Transients can be configured to allow the user to invoke
|
||
non-suffix commands. The default is to not allow that and instead
|
||
warn the user.
|
||
|
||
Despite already being rather complex, even the last diagram leaves
|
||
out many details. Most importantly it implies that the decision whether
|
||
to remain transient is made later than it actually is made (for the most
|
||
part a function on ‘pre-command-hook’ is responsible). But such
|
||
implementation details are of little relevance to users and are covered
|
||
elsewhere.
|
||
|
||
|
||
File: transient.info, Node: Comparison With Other Packages, Prev: Comparison With Prefix Keys and Prefix Arguments, Up: Related Abstractions and Packages
|
||
|
||
7.2 Comparison With Other Packages
|
||
==================================
|
||
|
||
7.2.1 Magit-Popup
|
||
-----------------
|
||
|
||
Transient is the successor to Magit-Popup (see *note
|
||
(magit-popup)Top::).
|
||
|
||
One major difference between these two implementations of the same
|
||
ideas is that while Transient uses transient keymaps and embraces the
|
||
command-loop, Magit-Popup implemented an inferior mechanism that does
|
||
not use transient keymaps and that instead of using the command-loop
|
||
implements a naive alternative based on ‘read-char’.
|
||
|
||
Magit-Popup does not use classes and generic functions and defining a
|
||
new command type is near impossible as it involves adding hard-coded
|
||
special-cases to many functions. Because of that only a single new type
|
||
was added, which was not already part of Magit-Popup’s initial release.
|
||
|
||
A lot of things are hard-coded in Magit-Popup. One random example is
|
||
that the key bindings for switches must begin with "-" and those for
|
||
options must begin with "=".
|
||
|
||
7.2.2 Hydra
|
||
-----------
|
||
|
||
Hydra (see <https://github.com/abo-abo/hydra>) is another package that
|
||
provides features similar to those of Transient.
|
||
|
||
Both packages use transient keymaps to make a set of commands
|
||
temporarily available and show the available commands in a popup buffer.
|
||
|
||
A Hydra "body" is equivalent to a Transient "prefix" and a Hydra
|
||
"head" is equivalent to a Transient "suffix". Hydra has no equivalent
|
||
of a Transient "infix".
|
||
|
||
Both hydras and transients can be used as simple command dispatchers.
|
||
Used like this they are similar to regular prefix commands and prefix
|
||
keys, except that the available commands are shown in the popup buffer.
|
||
|
||
(Another package that does this is ‘which-key’. It does so
|
||
automatically for any incomplete key sequence. The advantage of that
|
||
approach is that no additional work is necessary; the disadvantage is
|
||
that the available commands are not organized semantically.)
|
||
|
||
Both Hydra and Transient provide features that go beyond simple
|
||
command dispatchers:
|
||
|
||
• Invoking a command from a hydra does not necessarily exit the
|
||
hydra. That makes it possible to invoke the same command again,
|
||
but using a shorter key sequence (i.e. the key that was used to
|
||
enter the hydra does not have to be pressed again).
|
||
|
||
Transient supports that too, but for now this feature is not a
|
||
focus and the interface is a bit more complicated. A very basic
|
||
example using the current interface:
|
||
|
||
(transient-define-prefix outline-navigate ()
|
||
:transient-suffix 'transient--do-stay
|
||
:transient-non-suffix 'transient--do-warn
|
||
[("p" "previous visible heading" outline-previous-visible-heading)
|
||
("n" "next visible heading" outline-next-visible-heading)])
|
||
|
||
• Transient supports infix arguments; values that are set by infix
|
||
commands and then consumed by the invoked suffix command(s).
|
||
|
||
To my knowledge, Hydra does not support that.
|
||
|
||
Both packages make it possible to specify how exactly the available
|
||
commands are outlined:
|
||
|
||
• With Hydra this is often done using an explicit format string,
|
||
which gives authors a lot of flexibility and makes it possible to
|
||
do fancy things.
|
||
|
||
The downside of this is that it becomes harder for a user to add
|
||
additional commands to an existing hydra and to change key
|
||
bindings.
|
||
|
||
• Transient allows the author of a transient to organize the commands
|
||
into groups and the use of generic functions allows authors of
|
||
transients to control exactly how a certain command type is
|
||
displayed.
|
||
|
||
However while Transient supports giving sections a heading it does
|
||
not currently support giving the displayed information more
|
||
structure by, for example, using box-drawing characters.
|
||
|
||
That could be implemented by defining a new group class, which lets
|
||
the author specify a format string. It should be possible to
|
||
implement that without modifying any existing code, but it does not
|
||
currently exist.
|
||
|
||
|
||
File: transient.info, Node: FAQ, Next: Keystroke Index, Prev: Related Abstractions and Packages, Up: Top
|
||
|
||
Appendix A FAQ
|
||
**************
|
||
|
||
A.1 Can I control how the popup buffer is displayed?
|
||
====================================================
|
||
|
||
Yes, see ‘transient-display-buffer-action’ in *note Other Options::.
|
||
|
||
A.2 Why did some of the key bindings change?
|
||
============================================
|
||
|
||
You may have noticed that the bindings for some of the common commands
|
||
do *not* have the prefix ‘C-x’ and that furthermore some of these
|
||
commands are grayed out while others are not. That unfortunately is a
|
||
bit confusing if the section of common commands is not shown
|
||
permanently, making the following explanation necessary.
|
||
|
||
The purpose of usually hiding that section but showing it after the
|
||
user pressed the respective prefix key is to conserve space and not
|
||
overwhelm users with too much noise, while allowing the user to quickly
|
||
list common bindings on demand.
|
||
|
||
That however should not keep us from using the best possible key
|
||
bindings. The bindings that do use a prefix do so to avoid wasting too
|
||
many non-prefix bindings, keeping them available for use in individual
|
||
transients. The bindings that do not use a prefix and that are *not*
|
||
grayed out are very important bindings that are *always* available, even
|
||
when invoking the "common command key prefix" or *any other*
|
||
transient-specific prefix. The non-prefix keys that *are* grayed out
|
||
however, are not available when any incomplete prefix key sequence is
|
||
active. They do not use the "common command key prefix" because it is
|
||
likely that users want to invoke them several times in a row and e.g.
|
||
‘M-p M-p M-p’ is much more convenient than ‘C-x M-p C-x M-p C-x M-p’.
|
||
|
||
You may also have noticed that the "Set" command is bound to ‘C-x s’,
|
||
while Magit-Popup used to bind ‘C-c C-c’ instead. I have seen several
|
||
users praise the latter binding (sic), so I did not change it
|
||
willy-nilly. The reason that I changed it is that using different
|
||
prefix keys for different common commands, would have made the temporary
|
||
display of the common commands even more confusing, i.e. after pressing
|
||
‘C-c’ all the ‘C-x ...’ bindings would be grayed out.
|
||
|
||
Using a single prefix for common commands key means that all other
|
||
potential prefix keys can be used for transient-specific commands
|
||
*without* the section of common commands also popping up. ‘C-c’ in
|
||
particular is a prefix that I want to (and already do) use for Magit,
|
||
and also using that for a common command would prevent me from doing so.
|
||
|
||
(Also see the next question.)
|
||
|
||
A.3 Why does ‘q’ not quit popups anymore?
|
||
=========================================
|
||
|
||
I agree that ‘q’ is a good binding for commands that quit something.
|
||
This includes quitting whatever transient is currently active, but it
|
||
also includes quitting whatever it is that some specific transient is
|
||
controlling. The transient ‘magit-blame’ for example binds ‘q’ to the
|
||
command that turns ‘magit-blame-mode’ off.
|
||
|
||
So I had to decide if ‘q’ should quit the active transient (like
|
||
Magit-Popup used to) or whether ‘C-g’ should do that instead, so that
|
||
‘q’ could be bound in individual transient to whatever commands make
|
||
sense for them. Because all other letters are already reserved for use
|
||
by individual transients, I have decided to no longer make an exception
|
||
for ‘q’.
|
||
|
||
If you want to get ‘q’’s old binding back then you can do so. Doing
|
||
that is a bit more complicated than changing a single key binding, so I
|
||
have implemented a function, ‘transient-bind-q-to-quit’ that makes the
|
||
necessary changes. See its doc string for more information.
|
||
|
||
|
||
File: transient.info, Node: Keystroke Index, Next: Command Index, Prev: FAQ, Up: Top
|
||
|
||
Appendix B Keystroke Index
|
||
**************************
|
||
|
||
[index ]
|
||
* Menu:
|
||
|
||
* C-g: Aborting and Resuming Transients.
|
||
(line 25)
|
||
* C-g <1>: Aborting and Resuming Transients.
|
||
(line 26)
|
||
* C-h: Getting Help for Suffix Commands.
|
||
(line 10)
|
||
* C-q: Aborting and Resuming Transients.
|
||
(line 36)
|
||
* C-x C-s: Saving Values. (line 25)
|
||
* C-x l: Enabling and Disabling Suffixes.
|
||
(line 49)
|
||
* C-x s: Saving Values. (line 20)
|
||
* C-x t: Common Suffix Commands.
|
||
(line 16)
|
||
* C-z: Aborting and Resuming Transients.
|
||
(line 42)
|
||
* M-n: Using History. (line 16)
|
||
* M-p: Using History. (line 11)
|
||
* M-x transient-resume: Aborting and Resuming Transients.
|
||
(line 55)
|
||
|
||
|
||
File: transient.info, Node: Command Index, Next: Function Index, Prev: Keystroke Index, Up: Top
|
||
|
||
Appendix C Command Index
|
||
************************
|
||
|
||
[index ]
|
||
* Menu:
|
||
|
||
* transient-help: Getting Help for Suffix Commands.
|
||
(line 10)
|
||
* transient-history-next: Using History. (line 16)
|
||
* transient-history-prev: Using History. (line 11)
|
||
* transient-quit-all: Aborting and Resuming Transients.
|
||
(line 36)
|
||
* transient-quit-one: Aborting and Resuming Transients.
|
||
(line 26)
|
||
* transient-quit-seq: Aborting and Resuming Transients.
|
||
(line 25)
|
||
* transient-resume: Aborting and Resuming Transients.
|
||
(line 55)
|
||
* transient-save: Saving Values. (line 25)
|
||
* transient-scroll-down arg: Other Commands. (line 18)
|
||
* transient-scroll-up arg: Other Commands. (line 12)
|
||
* transient-set: Saving Values. (line 20)
|
||
* transient-set-level: Enabling and Disabling Suffixes.
|
||
(line 49)
|
||
* transient-suspend: Aborting and Resuming Transients.
|
||
(line 42)
|
||
* transient-toggle-common: Common Suffix Commands.
|
||
(line 16)
|
||
|
||
|
||
File: transient.info, Node: Function Index, Next: Variable Index, Prev: Command Index, Up: Top
|
||
|
||
Appendix D Function Index
|
||
*************************
|
||
|
||
[index ]
|
||
* Menu:
|
||
|
||
* transient--do-call: Transient State. (line 98)
|
||
* transient--do-exit: Transient State. (line 94)
|
||
* transient--do-noop: Transient State. (line 125)
|
||
* transient--do-quit-all: Transient State. (line 138)
|
||
* transient--do-quit-one: Transient State. (line 132)
|
||
* transient--do-replace: Transient State. (line 102)
|
||
* transient--do-stay: Transient State. (line 85)
|
||
* transient--do-suspend: Transient State. (line 144)
|
||
* transient--do-warn: Transient State. (line 121)
|
||
* transient--history-init: Prefix Classes. (line 10)
|
||
* transient--insert-group: Group Methods. (line 6)
|
||
* transient-append-suffix: Modifying Existing Transients.
|
||
(line 47)
|
||
* transient-args: Using Infix Arguments.
|
||
(line 22)
|
||
* transient-define-argument: Defining Suffix and Infix Commands.
|
||
(line 63)
|
||
* transient-define-infix: Defining Suffix and Infix Commands.
|
||
(line 27)
|
||
* transient-define-prefix: Defining Transients. (line 13)
|
||
* transient-define-suffix: Defining Suffix and Infix Commands.
|
||
(line 9)
|
||
* transient-format: Suffix Format Methods.
|
||
(line 6)
|
||
* transient-format-description: Suffix Format Methods.
|
||
(line 20)
|
||
* transient-format-key: Suffix Format Methods.
|
||
(line 15)
|
||
* transient-format-value: Suffix Format Methods.
|
||
(line 25)
|
||
* transient-get-suffix: Modifying Existing Transients.
|
||
(line 60)
|
||
* transient-infix-read: Suffix Value Methods.
|
||
(line 17)
|
||
* transient-infix-set: Suffix Value Methods.
|
||
(line 39)
|
||
* transient-infix-value: Suffix Value Methods.
|
||
(line 43)
|
||
* transient-init-scope: Suffix Value Methods.
|
||
(line 57)
|
||
* transient-init-value: Suffix Value Methods.
|
||
(line 6)
|
||
* transient-insert-suffix: Modifying Existing Transients.
|
||
(line 42)
|
||
* transient-prompt: Suffix Value Methods.
|
||
(line 34)
|
||
* transient-remove-suffix: Modifying Existing Transients.
|
||
(line 56)
|
||
* transient-replace-suffix: Modifying Existing Transients.
|
||
(line 51)
|
||
* transient-scroll-down: Other Commands. (line 18)
|
||
* transient-scroll-up: Other Commands. (line 12)
|
||
* transient-show-help: Suffix Format Methods.
|
||
(line 30)
|
||
* transient-suffix-put: Modifying Existing Transients.
|
||
(line 65)
|
||
|
||
|
||
File: transient.info, Node: Variable Index, Prev: Function Index, Up: Top
|
||
|
||
Appendix E Variable Index
|
||
*************************
|
||
|
||
[index ]
|
||
* Menu:
|
||
|
||
* transient-current-command: Using Infix Arguments.
|
||
(line 47)
|
||
* transient-current-prefix: Using Infix Arguments.
|
||
(line 41)
|
||
* transient-current-suffixes: Using Infix Arguments.
|
||
(line 32)
|
||
* transient-default-level: Enabling and Disabling Suffixes.
|
||
(line 38)
|
||
* transient-detect-key-conflicts: Other Options. (line 137)
|
||
* transient-display-buffer-action: Other Options. (line 46)
|
||
* transient-enable-popup-navigation: Other Options. (line 28)
|
||
* transient-force-fixed-pitch: Other Options. (line 151)
|
||
* transient-highlight-mismatched-keys: Other Options. (line 96)
|
||
* transient-history-file: Using History. (line 33)
|
||
* transient-history-limit: Using History. (line 38)
|
||
* transient-levels-file: Enabling and Disabling Suffixes.
|
||
(line 44)
|
||
* transient-mode-line-format: Other Options. (line 71)
|
||
* transient-read-with-initial-input: Other Options. (line 88)
|
||
* transient-show-common-commands: Common Suffix Commands.
|
||
(line 23)
|
||
* transient-show-popup: Other Options. (line 6)
|
||
* transient-substitute-key-function: Other Options. (line 115)
|
||
* transient-values-file: Saving Values. (line 30)
|
||
|
||
|
||
|
||
Tag Table:
|
||
Node: Top751
|
||
Node: Introduction3673
|
||
Node: Usage9460
|
||
Node: Invoking Transients9794
|
||
Node: Aborting and Resuming Transients10826
|
||
Node: Common Suffix Commands13485
|
||
Node: Saving Values15239
|
||
Ref: Saving Values-Footnote-116497
|
||
Node: Using History16767
|
||
Node: Getting Help for Suffix Commands18308
|
||
Node: Enabling and Disabling Suffixes19701
|
||
Node: Other Commands22991
|
||
Node: Other Options23947
|
||
Node: Modifying Existing Transients31071
|
||
Node: Defining New Commands34473
|
||
Node: Defining Transients34809
|
||
Node: Binding Suffix and Infix Commands37240
|
||
Node: Group Specifications38094
|
||
Node: Suffix Specifications41426
|
||
Node: Defining Suffix and Infix Commands45001
|
||
Node: Using Infix Arguments48199
|
||
Node: Transient State50419
|
||
Node: Classes and Methods56292
|
||
Node: Group Classes58506
|
||
Node: Group Methods60422
|
||
Node: Prefix Classes61068
|
||
Node: Suffix Classes62160
|
||
Node: Suffix Methods64404
|
||
Node: Suffix Value Methods64725
|
||
Node: Suffix Format Methods67485
|
||
Node: Prefix Slots68937
|
||
Node: Suffix Slots71412
|
||
Node: Predicate Slots74263
|
||
Node: Related Abstractions and Packages75511
|
||
Node: Comparison With Prefix Keys and Prefix Arguments75798
|
||
Node: Comparison With Other Packages86110
|
||
Node: FAQ90300
|
||
Node: Keystroke Index94034
|
||
Node: Command Index95668
|
||
Node: Function Index97455
|
||
Node: Variable Index101612
|
||
|
||
End Tag Table
|
||
|
||
|
||
Local Variables:
|
||
coding: utf-8
|
||
End:
|