Use new access functions for buffer-local variables

Ref #256

autoload/vimwiki/base.vim

@@ -722,7 +722,7 @@ function! vimwiki#base#edit_file(command, filename, anchor, ...) "{{{
   " a:1 -- previous vimwiki link to save
   " a:2 -- should we update previous link
   if a:0 && a:2 && len(a:1) > 0
-    let b:vimwiki_prev_link = a:1
+    call vimwiki#vars#set_bufferlocal('prev_link', a:1)
   endif
 endfunction " }}}
 
@@ -880,8 +880,10 @@ function! s:get_wiki_buffers() "{{{
   while bcount<=bufnr("$")
     if bufexists(bcount)
       let bname = fnamemodify(bufname(bcount), ":p")
+      " this may find buffers that are not part of the current wiki, but that
+      " doesn't hurt
       if bname =~# vimwiki#vars#get_wikilocal('ext')."$"
-        let bitem = [bname, getbufvar(bname, "vimwiki_prev_link")]
+        let bitem = [bname, vimwiki#vars#get_bufferlocal('prev_link', bcount)]
         call add(blist, bitem)
       endif
     endif
@@ -894,7 +896,7 @@ endfunction " }}}
 function! s:open_wiki_buffer(item) "{{{
   call vimwiki#base#edit_file(':e', a:item[0], '')
   if !empty(a:item[1])
-    call setbufvar(a:item[0], "vimwiki_prev_link", a:item[1])
+    call vimwiki#vars#set_bufferlocal('prev_link', a:item[1], a:item[0])
   endif
 endfunction " }}}
 
@@ -1125,11 +1127,11 @@ endfunction " }}}
 
 " vimwiki#base#go_back_link
 function! vimwiki#base#go_back_link() "{{{
-  if exists("b:vimwiki_prev_link")
+  let prev_link = vimwiki#vars#get_bufferlocal('prev_link')
+  if prev_link !=# ''
     " go back to saved wiki link
-    let prev_word = b:vimwiki_prev_link
-    execute ":e ".substitute(prev_word[0], '\s', '\\\0', 'g')
-    call setpos('.', prev_word[1])
+    execute ":e ".substitute(prev_link[0], '\s', '\\\0', 'g')
+    call setpos('.', prev_link[1])
   else
     " maybe we came here by jumping to a tag -> pop from the tag stack
     silent! pop!
@@ -1251,7 +1253,7 @@ function! vimwiki#base#rename_link() "{{{
   let &buftype="nofile"
 
   let cur_buffer = [expand('%:p'),
-        \getbufvar(expand('%:p'), "vimwiki_prev_link")]
+        \ vimwiki#vars#get_bufferlocal('prev_link')]
 
   let blist = s:get_wiki_buffers()
 

autoload/vimwiki/vars.vim

@@ -540,35 +540,40 @@ function! vimwiki#vars#get_syntaxlocal(key, ...)
 endfunction
 
 
-" Get a variable for the buffer we are currently in.
+" Get a variable for the buffer we are currently in or for the given buffer (number or name).
 " Populate the variable, if it doesn't exist.
-function! vimwiki#vars#get_bufferlocal(key)
-  if exists('b:vimwiki_'.a:key)
-    return b:vimwiki_{a:key}
+function! vimwiki#vars#get_bufferlocal(key, ...)
+  let buffer = a:0 ? a:1 : '%'
+
+  let value = getbufvar(buffer, 'vimwiki_'.a:key, '/\/\')
+  if type(value) != 1 || value !=# '/\/\'
+    return value
   elseif a:key ==# 'wiki_nr'
-    let b:vimwiki_wiki_nr = vimwiki#base#find_wiki(expand('%:p'))
-    return b:vimwiki_wiki_nr
+    call setbufvar(buffer, 'vimwiki_wiki_nr', vimwiki#base#find_wiki(expand('%:p')))
   elseif a:key ==# 'subdir'
-    let b:vimwiki_subdir = vimwiki#base#current_subdir()
-    return b:vimwiki_subdir
+    call setbufvar(buffer, 'vimwiki_subdir', vimwiki#base#current_subdir())
   elseif a:key ==# 'invsubdir'
     let subdir = vimwiki#vars#get_bufferlocal('subdir')
-    let b:vimwiki_invsubdir = vimwiki#base#invsubdir(subdir)
-    return b:vimwiki_invsubdir
+    call setbufvar(buffer, 'vimwiki_invsubdir', vimwiki#base#invsubdir(subdir))
   elseif a:key ==# 'existing_wikifiles'
-    let b:vimwiki_existing_wikifiles =
-        \ vimwiki#base#get_wikilinks(vimwiki#vars#get_bufferlocal('wiki_nr'), 1)
-    return b:vimwiki_existing_wikifiles
+    call setbufvar(buffer, 'vimwiki_existing_wikifiles',
+          \ vimwiki#base#get_wikilinks(vimwiki#vars#get_bufferlocal('wiki_nr'), 1))
   elseif a:key ==# 'existing_wikidirs'
-    let b:vimwiki_existing_wikidirs =
-        \ vimwiki#base#get_wiki_directories(vimwiki#vars#get_bufferlocal('wiki_nr'))
-    return b:vimwiki_existing_wikidirs
+    call setbufvar(buffer, 'vimwiki_existing_wikidirs',
+        \ vimwiki#base#get_wiki_directories(vimwiki#vars#get_bufferlocal('wiki_nr')))
+  elseif a:key ==# 'prev_link'
+    call setbufvar(buffer, 'vimwiki_prev_link', '')
+  elseif a:key ==# 'fs_rescan'
+    call setbufvar(buffer, 'vimwiki_fs_rescan', 0)
   endif
+
+  return getbufvar(buffer, 'vimwiki_'.a:key)
 endfunction
 
 
-function! vimwiki#vars#set_bufferlocal(key, value)
-  let b:vimwiki_{a:key} = a:value
+function! vimwiki#vars#set_bufferlocal(key, value, ...)
+  let buffer = a:0 ? a:1 : '%'
+  call setbufvar(buffer, 'vimwiki_' . a:key, a:value)
 endfunction
 
 

plugin/vimwiki.vim

@@ -66,11 +66,11 @@ function! s:setup_new_wiki_buffer() "{{{
 
   " to force a rescan of the filesystem which may have changed
   " and update VimwikiLinks syntax group that depends on it;
-  " b:vimwiki_fs_rescan indicates that setup_filetype() has not been run
-  if exists('b:vimwiki_fs_rescan') && vimwiki#vars#get_wikilocal('maxhi')
+  " 'fs_rescan' indicates that setup_filetype() has not been run
+  if vimwiki#vars#get_bufferlocal('fs_rescan') == 1 && vimwiki#vars#get_wikilocal('maxhi')
     set syntax=vimwiki
   endif
-  let b:vimwiki_fs_rescan = 1
+  call vimwiki#vars#set_bufferlocal('fs_rescan', 1)
 endfunction "}}}
 
 
@@ -90,11 +90,11 @@ function! s:setup_buffer_enter() "{{{
   elseif &syntax ==? 'vimwiki'
     " to force a rescan of the filesystem which may have changed
     " and update VimwikiLinks syntax group that depends on it;
-    " b:vimwiki_fs_rescan indicates that setup_filetype() has not been run
-    if exists("b:vimwiki_fs_rescan") && vimwiki#vars#get_wikilocal('maxhi')
+    " 'fs_rescan' indicates that setup_filetype() has not been run
+    if vimwiki#vars#get_bufferlocal('fs_rescan') == 1 && vimwiki#vars#get_wikilocal('maxhi')
       set syntax=vimwiki
     endif
-    let b:vimwiki_fs_rescan = 1
+    call vimwiki#vars#set_bufferlocal('fs_rescan', 1)
   endif
 
   " The settings foldmethod, foldexpr and foldtext are local to window. Thus in