Update

autoload/LaTeXtoUnicode.vim

@@ -13,6 +13,9 @@ function! s:L2U_Setup()
   if !has_key(b:, "l2u_enabled")
     let b:l2u_enabled = 0
   endif
+  if !has_key(b:, "l2u_autodetect_enable")
+    let b:l2u_autodetect_enable = 1
+  endif
 
   " Did we install the L2U tab mappings?
   if !has_key(b:, "l2u_tab_set")
@@ -92,34 +95,39 @@ endfunction
 " Each time the filetype changes, we may need to enable or
 " disable the LaTeX-to-Unicode functionality
 function! LaTeXtoUnicode#Refresh()
-
   call s:L2U_Setup()
 
+  " skip if manually overridden
+  if !b:l2u_autodetect_enable
+    return ''
+  endif
+
   " by default, LaTeX-to-Unicode is only active on julia files
   let file_types = s:L2U_file_type_regex(get(g:, "latex_to_unicode_file_types", "julia"))
   let file_types_blacklist = s:L2U_file_type_regex(get(g:, "latex_to_unicode_file_types_blacklist", "$^"))
 
   if match(&filetype, file_types) < 0 || match(&filetype, file_types_blacklist) >= 0
     if b:l2u_enabled
-      call LaTeXtoUnicode#Disable()
+      call LaTeXtoUnicode#Disable(1)
     else
-      return
+      return ''
     endif
   elseif !b:l2u_enabled
-    call LaTeXtoUnicode#Enable()
+    call LaTeXtoUnicode#Enable(1)
   endif
-
 endfunction
 
-function! LaTeXtoUnicode#Enable()
+function! LaTeXtoUnicode#Enable(...)
+  let auto_set = a:0 > 0 ? a:1 : 0
 
   if b:l2u_enabled
-    return
+    return ''
   end
 
   call s:L2U_ResetLastCompletionInfo()
 
   let b:l2u_enabled = 1
+  let b:l2u_autodetect_enable = auto_set
 
   " If we're editing the first file upon opening vim, this will only init the
   " command line mode mapping, and the full initialization will be performed by
@@ -127,18 +135,18 @@ function! LaTeXtoUnicode#Enable()
   " Otherwise, if we're opening a file from within a running vim session, this
   " will actually initialize all the LaTeX-to-Unicode substitutions.
   call LaTeXtoUnicode#Init()
-
-  return
-
+  return ''
 endfunction
 
-function! LaTeXtoUnicode#Disable()
+function! LaTeXtoUnicode#Disable(...)
+  let auto_set = a:0 > 0 ? a:1 : 0
   if !b:l2u_enabled
-    return
+    return ''
   endif
   let b:l2u_enabled = 0
+  let b:l2u_autodetect_enable = auto_set
   call LaTeXtoUnicode#Init()
-  return
+  return ''
 endfunction
 
 " Translate old options to their new equivalents
@@ -246,7 +254,6 @@ function! LaTeXtoUnicode#omnifunc(findstart, base)
     endif
     let b:l2u_in_fallback = 0
     " set info for the callback
-    let b:l2u_tab_completing = 1
     let b:l2u_found_completion = 1
     " analyse current line
     let col1 = col('.')
@@ -375,6 +382,7 @@ function! LaTeXtoUnicode#Tab()
   endif
   " reset the in_fallback info
   let b:l2u_in_fallback = 0
+  let b:l2u_tab_completing = 1
   " temporary change to completeopt to use the `longest` setting, which is
   " probably the only one which makes sense given that the goal of the
   " completion is to substitute the final string
@@ -383,7 +391,8 @@ function! LaTeXtoUnicode#Tab()
   set completeopt-=noinsert
   " invoke omnicompletion; failure to perform LaTeX-to-Unicode completion is
   " handled by the CompleteDone autocommand.
-  return "\<C-X>\<C-O>"
+  call feedkeys("\<C-X>\<C-O>", 'n')
+  return ""
 endfunction
 
 " This function is called at every CompleteDone event, and is meant to handle
@@ -409,7 +418,7 @@ function! LaTeXtoUnicode#FallbackCallback()
 endfunction
 
 " This is the function that performs the substitution in command-line mode
-function! LaTeXtoUnicode#CmdTab(triggeredbytab)
+function! LaTeXtoUnicode#CmdTab(trigger)
   " first stage
   " analyse command line
   let col1 = getcmdpos() - 1
@@ -418,10 +427,12 @@ function! LaTeXtoUnicode#CmdTab(triggeredbytab)
   let b:l2u_singlebslash = (match(l[0:col1-1], '\\$') >= 0)
   " completion not found
   if col0 == -1
-    if a:triggeredbytab
-      call feedkeys("\<Tab>", 'nt') " fall-back to the default <Tab>
+    if a:trigger == &wildchar
+      call feedkeys(nr2char(a:trigger), 'nt') " fall-back to the default wildchar
+    elseif a:trigger == char2nr("\<S-Tab>")
+      call feedkeys("\<S-Tab>", 'nt') " fall-back to the default <S-Tab>
     endif
-    return l
+    return ''
   endif
   let base = l[col0 : col1-1]
   " search for matches
@@ -430,39 +441,28 @@ function! LaTeXtoUnicode#CmdTab(triggeredbytab)
   for k in keys(g:l2u_symbols_dict)
     if k ==# base
       let exact_match = 1
-    endif
-    if len(k) >= len(base) && k[0 : len(base)-1] ==# base
+      break
+    elseif len(k) >= len(base) && k[0 : len(base)-1] ==# base
       call add(partmatches, k)
     endif
   endfor
-  if len(partmatches) == 0
-    if a:triggeredbytab
-      call feedkeys("\<Tab>", 'nt') " fall-back to the default <Tab>
+  if !exact_match && len(partmatches) == 0
+    " no matches, call fallbacks
+    if a:trigger == &wildchar
+      call feedkeys(nr2char(a:trigger), 'nt') " fall-back to the default wildchar
+    elseif a:trigger == char2nr("\<S-Tab>")
+      call feedkeys("\<S-Tab>", 'nt') " fall-back to the default <S-Tab>
     endif
-    return l
-  endif
-  " exact matches are replaced with Unicode
-  if exact_match
+  elseif exact_match
+    " exact matches are replaced with Unicode
     let unicode = g:l2u_symbols_dict[base]
-    if col0 > 0
-      let pre = l[0 : col0 - 1]
-    else
-      let pre = ''
-    endif
-    let posdiff = col1-col0 - len(unicode)
-    call setcmdpos(col1 - posdiff + 1)
-    return pre . unicode . l[col1 : -1]
-  endif
-  " no exact match: complete with the longest common prefix
-  let common = s:L2U_longest_common_prefix(partmatches)
-  if col0 > 0
-    let pre = l[0 : col0 - 1]
+    call feedkeys(repeat("\b", len(base)) . unicode, 'nt')
   else
-    let pre = ''
+    " no exact match: complete with the longest common prefix
+    let common = s:L2U_longest_common_prefix(partmatches)
+    call feedkeys(common[len(base):], 'nt')
   endif
-  let posdiff = col1-col0 - len(common)
-  call setcmdpos(col1 - posdiff + 1)
-  return pre . common . l[col1 : -1]
+  return ''
 endfunction
 
 " Setup the L2U tab mapping
@@ -473,7 +473,8 @@ function! s:L2U_SetTab(wait_insert_enter)
       let b:l2u_cmdtab_keys = [b:l2u_cmdtab_keys]
     endif
     for k in b:l2u_cmdtab_keys
-      exec 'cnoremap <buffer> '.k.' <C-\>eLaTeXtoUnicode#CmdTab('.(k ==? '<Tab>').')<CR>'
+      exec 'let trigger = char2nr("'.(k[0] == '<' ? '\' : '').k.'")'
+      exec 'cnoremap <buffer><expr> '.k.' LaTeXtoUnicode#CmdTab('.trigger.')'
     endfor
     let b:l2u_cmdtab_set = 1
   endif
@@ -637,6 +638,7 @@ function! LaTeXtoUnicode#Init(...)
   call s:L2U_SetTab(wait_insert_enter)
   call s:L2U_SetAutoSub(wait_insert_enter)
   call s:L2U_SetKeymap()
+  return ''
 endfunction
 
 function! LaTeXtoUnicode#Toggle()
@@ -648,7 +650,7 @@ function! LaTeXtoUnicode#Toggle()
     call LaTeXtoUnicode#Enable()
     echo "LaTeX-to-Unicode enabled"
   endif
-  return
+  return ''
 endfunction
 
 endif