Allow additional filetypes to be registered to vimwiki files.

This options allow third party plugins to register and enable additonal
functionality by setting the filetype to vimwiki.other_ft.other_ft2 etc.
This option should be used with care since vimwiki functionality can be
overwritten by other plugins. See Issue #461 for an example use case.

autoload/vimwiki/base.vim

@@ -309,7 +309,7 @@ function! vimwiki#base#open_link(cmd, link, ...)
   if update_prev_link
     if a:0
       let vimwiki_prev_link = [a:1, []]
-    elseif &ft ==# 'vimwiki'
+    elseif vimwiki#u#ft_is_vw()
       let vimwiki_prev_link = [vimwiki#path#current_wiki_file(), getpos('.')]
     endif
   endif
@@ -811,8 +811,8 @@ function! vimwiki#base#edit_file(command, filename, anchor, ...)
     " Make sure no other plugin takes ownership over the new file. Vimwiki
     " rules them all! Well, except for directories, which may be opened with
     " Netrw
-    if &filetype != 'vimwiki' && fname !~ '\m/$'
+    if !vimwiki#u#ft_is_vw() && fname !~? '\m/$'
-      setfiletype vimwiki
+      call vimwiki#u#ft_set()
     endif
   endif
   if a:anchor != ''

autoload/vimwiki/tbl.vim

@@ -676,7 +676,7 @@ endfunction
 
 
 function! vimwiki#tbl#format(lnum, ...)
-  if !(&filetype ==? 'vimwiki')
+  if !vimwiki#u#ft_is_vw()
     return
   endif
   let line = getline(a:lnum)
@@ -759,7 +759,7 @@ endfunction
 
 
 function! vimwiki#tbl#reset_tw(lnum)
-  if !(&filetype ==? 'vimwiki')
+  if !vimwiki#u#ft_is_vw()
     return
   endif
   let line = getline(a:lnum)

autoload/vimwiki/u.vim

@@ -70,3 +70,28 @@ else
   endfunc
 endif
 
+
+" Sets the filetype to vimwiki
+" If g:vimwiki_filetypes variable is set
+" the filetype will be vimwiki.<ft1>.<ft2> etc.
+function! vimwiki#u#ft_set()
+  let ftypelist = vimwiki#vars#get_global('filetypes')
+  let ftype = 'vimwiki'
+  for ftypeadd in ftypelist
+    let ftype = ftype . '.' . ftypeadd
+  endfor
+  let &filetype = ftype
+endfunction
+
+
+" Returns: 1 if filetype is vimwiki, 0 else
+" If multiple fileytpes are in use 1 is returned only if the
+" first ft is vimwiki which should always be the case unless
+" the user manually changes it to something else
+function! vimwiki#u#ft_is_vw()
+  if split(&filetype, '\.')[0] ==? 'vimwiki'
+    return 1
+  else
+    return 0
+  endif
+endfunction

autoload/vimwiki/vars.vim

@@ -160,6 +160,7 @@ function! s:read_global_settings_from_user()
         \ 'folding': {'type': type(''), 'default': '', 'possible_values': ['', 'expr', 'syntax',
         \     'list', 'custom', ':quick', 'expr:quick', 'syntax:quick', 'list:quick',
         \     'custom:quick']},
+        \ 'filetypes': {'type': type([]), 'default': []},
         \ 'global_ext': {'type': type(0), 'default': 1, 'min': 0, 'max': 1},
         \ 'hl_cb_checked': {'type': type(0), 'default': 0, 'min': 0, 'max': 2},
         \ 'hl_headers': {'type': type(0), 'default': 0, 'min': 0, 'max': 1},

doc/vimwiki.txt

@@ -3161,6 +3161,21 @@ values are from 0 to 2.
 The default is 1.
 
 
+------------------------------------------------------------------------------
+*g:vimwiki_filetypes*
+
+A list of additional fileypes that should be registered to vimwiki files: >
+
+  let g:vimwiki_filetypes = ['markdown', 'pandoc']
+
+Would result in the filetype being set to `vimwiki.markdown.pandoc`. This can
+be used to enable third party plugins such as custom folding. WARNING: this
+option can allow other plugins to overwrite vimwiki settings and operation so
+take care when using it. Any plugin that uses a set filetype will be enabled.
+
+The default is `[ ]`
+
+
 ==============================================================================
 13. Getting help                                                *vimwiki-help*
 

plugin/vimwiki.vim

@@ -89,7 +89,7 @@ function! s:setup_new_wiki_buffer()
 
   " this makes that ftplugin/vimwiki.vim and afterwards syntax/vimwiki.vim are
   " sourced
-  setfiletype vimwiki
+  call vimwiki#u#ft_set()
 
 endfunction
 
@@ -102,8 +102,8 @@ function! s:setup_buffer_enter()
     return
   endif
 
-  if &filetype != 'vimwiki'
+  if !vimwiki#u#ft_is_vw()
-    setfiletype vimwiki
+    call vimwiki#u#ft_set()
   endif
 
   call s:set_global_options()