Feature: Add handling of absolute path to vimwiki #811 from @justrajdeep

- update vimwiki link handling so that if using env variables it is resolved
- add [[//absolute_path]] to handle absolute path
- updated doc to reflect the changes

autoload/vimwiki/base.vim

@@ -131,7 +131,7 @@ function! vimwiki#base#resolve_link(link_text, ...) abort
     let source_file = vimwiki#path#current_wiki_file()
   endif
 
-  " get rid of '\' in escaped characters in []() style markdown links
+  " Get rid of '\' in escaped characters in []() style markdown links
   " other style links don't allow '\'
   let link_text = substitute(a:link_text, '\(\\\)\(\W\)\@=', '', 'g')
 
@@ -163,7 +163,7 @@ function! vimwiki#base#resolve_link(link_text, ...) abort
 
   let is_wiki_link = s:is_wiki_link(link_infos)
 
-  " extract anchor
+  " Extract anchor
   if is_wiki_link
     let split_lnk = split(link_text, '#', 1)
     let link_text = split_lnk[0]
@@ -181,11 +181,18 @@ function! vimwiki#base#resolve_link(link_text, ...) abort
     endif
   endif
 
-  " check if absolute or relative path
+  " Check if absolute or relative path
+  let is_absolute = 0
   if is_wiki_link && link_text[0] ==# '/'
     if link_text !=# '/'
+      if link_text !=# '//' && link_text[0:1] ==# '//'
+        let link_text = resolve(expand(link_text))
+        let link_text = link_text[2:]
+        let is_absolute = 1
+      else
         let link_text = link_text[1:]
       endif
+    endif
     let is_relative = 0
   elseif !is_wiki_link && vimwiki#path#is_absolute(link_text)
     let is_relative = 0
@@ -195,7 +202,7 @@ function! vimwiki#base#resolve_link(link_text, ...) abort
   endif
 
 
-  " extract the other items depending on the scheme
+  " Extract the other items depending on the scheme
   if link_infos.scheme =~# '\mwiki\d\+'
 
     " interwiki link named wiki 'wn.name:link' format
@@ -227,8 +234,9 @@ function! vimwiki#base#resolve_link(link_text, ...) abort
         return link_infos
       endif
     endif
-
-    if !is_relative || link_infos.index != source_wiki
+    if is_absolute
+        let root_dir = ''
+    elseif !is_relative || link_infos.index != source_wiki
       let root_dir = vimwiki#vars#get_wikilocal('path', link_infos.index)
     endif
 
@@ -265,6 +273,7 @@ function! vimwiki#base#resolve_link(link_text, ...) abort
   endif
 
   let link_infos.filename = vimwiki#path#normalize(link_infos.filename)
+
   return link_infos
 endfunction
 

doc/vimwiki.txt

@@ -1019,6 +1019,14 @@ absolute to the wiki root directory, that is, the link [[/index]] always opens
 the file /path/to/your/wiki/index.wiki, no matter in which subdirectory you
 are currently in.
 
+If you want an absolute path in your local box you can prefix the path
+with // >
+  [[//absolute_path]]
+For example: >
+  [[///tmp/in_root_tmp]]
+  [[//~/in_home_dir]]
+  [[//$HOME/in_home_dir]]
+
 Links to subdirectories inside the wiki directory are also supported. They
 end with a "/": >
   [[a subdirectory/|Other files]]
@@ -3636,6 +3644,7 @@ http://code.google.com/p/vimwiki/issues/list. They may be accessible from
 https://github.com/vimwiki-backup/vimwiki/issues.
 
 New:~
+    * PR #811: Feature: Added handling of absolute path to vimwiki (with //)
     * PR #919: Fix duplicate helptag
     * PR #907: Cycle bullets
     * PR #900: conceallevel is now setted locally for vimwiki buffers

test/link_creation.vader

@@ -1,8 +1,68 @@
 Include: vader_includes/vader_setup.vader
 
+# Absolute links {{{1
+####################
+
+Execute (Log):
+  Log 'Absolute links'
+
+# For markdown {{{2
+# ------------------
+
+Execute (Set filename wiki_test.md):
+  Log '>> Absolute link, markdown syntax'
+  file wiki_test.md
+  call SetSyntax('markdown')
+
+Given vimwiki(some wiki link):
+  [test1](//$HOME/in_home1)
+  [test2](//~/in_home2)
+  [test3](///tmp/in_tmp)
+
+Do (Check in_home1):
+  \<Cr>
+  :AssertEqual expand('%'), $HOME.'/in_home1.md'\<Cr>
+
+Do (Check in_home2):
+  j\<Cr>
+  :AssertEqual expand('%'), $HOME.'/in_home2.md'\<Cr>
+
+Do (Check in_tmp):
+  jj\<Cr>
+  :AssertEqual expand('%'), '/tmp/in_tmp.md'\<Cr>
+
+# For Wiki {{{2
+# ------------------
+
+Execute (Set filename wiki_test.wiki):
+  Log '>> Absolute link, wiki syntax'
+  file wiki_test.wiki
+  call SetSyntax('default')
+
+Given vimwiki(some wiki link):
+  [[//$HOME/in_home1]]
+  [[//~/in_home2]]
+  [[///tmp/in_tmp]]
+
+Do (Check in_home1):
+  \<Cr>
+  :AssertEqual expand('%'), $HOME.'/in_home1.wiki'\<Cr>
+
+Do (Check in_home2):
+  j\<Cr>
+  :AssertEqual expand('%'), $HOME.'/in_home2.wiki'\<Cr>
+
+Do (Check in_tmp):
+  jj\<Cr>
+  :AssertEqual expand('%'), '/tmp/in_tmp.wiki'\<Cr>
+
+
 # Link with dot {{{1
 ####################
 
+Execute (Log):
+  Log 'Link  with dot'
+
 Given vimwiki (filnames with dots):
   part1.part2.part3
   part1.part2.part3.md
@@ -39,6 +99,9 @@ Do (j<Cr><Cr>):
 # Rest {{{1
 ##########################
 
+Execute (Log):
+  Log 'And more'
+
 Given vimwiki (Text that is not a wikilink):
   test
   www.google.com