--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/plugin/autotags.vim	Thu Jul 17 17:26:48 2014 -0700
@@ -0,0 +1,312 @@
+" autotags.vim - Automatic ctags management for Vim
+" Maintainer:   Ludovic Chabant <http://ludovic.chabant.com>
+" Version:      0.0.1
+
+" Globals {{{
+
+if !exists('g:autotags_debug')
+    let g:autotags_debug = 0
+endif
+
+if (exists('g:loaded_autotags') || &cp) && !g:autotags_debug
+    finish
+endif
+if (exists('g:loaded_autotags') && g:autotags_debug)
+    echom "Reloaded autotags."
+endif
+let g:loaded_autotags = 1
+
+if !exists('g:autotags_trace')
+    let g:autotags_trace = 1
+endif
+
+if !exists('g:autotags_fake')
+    let g:autotags_fake = 0
+endif
+
+if !exists('g:autotags_background_update')
+    let g:autotags_background_update = 1
+endif
+
+if !exists('g:autotags_enabled')
+    let g:autotags_enabled = 1
+endif
+
+if !exists('g:autotags_executable')
+    let g:autotags_executable = 'ctags'
+endif
+
+if !exists('g:autotags_tagfile')
+    let g:autotags_tagfile = 'tags'
+endif
+
+if !exists('g:autotags_project_root')
+    let g:autotags_project_root = []
+endif
+let g:autotags_project_root += ['.git', '.hg', '.bzr', '_darcs']
+
+" }}}
+
+" Utilities {{{
+
+" Throw an exception message.
+function! s:throw(message)
+    let v:errmsg = "autotags: " . a:message
+    throw v:errmsg
+endfunction
+
+" Prints a message if debug tracing is enabled.
+function! s:trace(message, ...)
+   if g:autotags_trace || (a:0 && a:1)
+       let l:message = "autotags: " . a:message
+       echom l:message
+   endif
+endfunction
+
+" Strips the ending slash in a path.
+function! s:stripslash(path)
+    return fnamemodify(a:path, ':s?[/\\]$??')
+endfunction
+
+" Normalizes the slashes in a path.
+function! s:normalizepath(path)
+    if exists('+shellslash') && &shellslash
+        return substitute(a:path, '\v/', '\\', 'g')
+    elseif has('win32')
+        return substitute(a:path, '\v/', '\\', 'g')
+    else
+        return a:path
+    endif
+endfunction
+
+" Shell-slashes the path (opposite of `normalizepath`).
+function! s:shellslash(path)
+  if exists('+shellslash') && !&shellslash
+    return substitute(a:path, '\v\\', '/', 'g')
+  else
+    return a:path
+  endif
+endfunction
+
+" }}}
+
+" Autotags Setup {{{
+
+" Finds the tag file path for the given current directory
+" (typically the directory of the file being edited)
+function! s:get_tagfile_for(path) abort
+    let l:path = s:stripslash(a:path)
+    let l:previous_path = ""
+    while l:path != l:previous_path
+        for root in g:autotags_project_root
+            if getftype(l:path . '/' . root) != ""
+                return simplify(fnamemodify(l:path, ':p') . g:autotags_tagfile)
+            endif
+        endfor
+        let l:previous_path = l:path
+        let l:path = fnamemodify(l:path, ':h')
+    endwhile
+    call s:throw("Can't figure out what tag file to use for: " . a:path)
+endfunction
+
+" Setup autotags for the current buffer.
+function! s:setup_autotags() abort
+    call s:trace("Scanning buffer '" . bufname('%') . "' for autotags setup...")
+    if exists('b:autotags_file')
+        return
+    endif
+    try
+        let b:autotags_file = s:get_tagfile_for(expand('%:h'))
+    catch /^autotags\:/
+        return
+    endtry
+
+    call s:trace("Setting autotags for buffer '" . bufname('%') . "' with tagfile: " . b:autotags_file)
+
+    let l:bn = bufnr('%')
+    execute 'augroup autotags_buffer_' . l:bn
+    execute '  autocmd!'
+    execute '  autocmd BufWritePost <buffer=' . l:bn . '> if g:autotags_enabled|call s:update_tags(0, 1)|endif'
+    execute 'augroup end'
+
+    command! -buffer -bang AutotagsUpdate :call s:manual_update_tags(<bang>0)
+endfunction
+
+augroup autotags_detect
+    autocmd!
+    autocmd BufNewFile,BufReadPost *  call s:setup_autotags()
+    autocmd VimEnter               *  if expand('<amatch>')==''|call s:setup_autotags()|endif
+augroup end
+
+" }}}
+
+"  Tags File Management {{{
+
+let s:runner_exe = expand('<sfile>:h:h') . '/plat/unix/update_tags.sh'
+if has('win32')
+    let s:runner_exe = expand('<sfile>:h:h') . '\plat\win32\update_tags.cmd'
+endif
+
+let s:update_queue = []
+
+" Get how to execute an external command depending on debug settings.
+function! s:get_execute_cmd() abort
+    if has('win32')
+        let l:cmd = '!start '
+        if g:autotags_background_update
+            let l:cmd .= '/b '
+        endif
+        return l:cmd
+    else
+        return '!'
+    endif
+endfunction
+
+" (Re)Generate the tags file for the current buffer's file.
+function! s:manual_update_tags(bang) abort
+    call s:update_tags(a:bang, 0)
+endfunction
+
+" Update the tags file for the current buffer's file.
+" write_mode:
+"   0: update the tags file if it exists, generate it otherwise.
+"   1: always generate (overwrite) the tags file.
+"
+" queue_mode:
+"   0: if an update is already in progress, report it and abort.
+"   1: if an update is already in progress, queue another one.
+"
+" An additional argument specifies where to write the tags file. If nothing
+" is specified, it will go to the autotags-defined file.
+function! s:update_tags(write_mode, queue_mode, ...) abort
+    " Figure out where to save.
+    let l:tags_file = 0
+    if a:0 == 1
+        let l:tags_file = a:1
+    else
+        let l:tags_file = b:autotags_file
+    endif
+    
+    " Check that there's not already an update in progress.
+    let l:lock_file = l:tags_file . '.lock'
+    if filereadable(l:lock_file)
+        if a:queue_mode == 1
+            let l:idx = index(s:update_queue, l:tags_file)
+            if l:idx < 0
+                call add(s:update_queue, l:tags_file)
+            endif
+            call s:trace("Tag file '" . l:tags_file . "' is already being updated. Queuing it up...")
+            call s:trace("")
+        else
+            echom "autotags: The tags file is already being updated, please try again later."
+            echom ""
+        endif
+        return
+    endif
+
+    " Switch to the project root to make the command line smaller, and make
+    " it possible to get the relative path of the filename to parse if we're
+    " doing an incremental update.
+    let l:prev_cwd = getcwd()
+    let l:work_dir = fnamemodify(l:tags_file, ':h')
+    execute "chdir " . l:work_dir
+
+    try
+        " Build the command line.
+        let l:cmd = s:get_execute_cmd() . s:runner_exe
+        let l:cmd .= ' --exe "' . g:autotags_executable . '"'
+        let l:cmd .= ' --tags "' . fnamemodify(l:tags_file, ':t') . '"'
+        if a:write_mode == 0 && filereadable(l:tags_file)
+            " CTags specifies paths relative to the tags file with a `./`
+            " prefix, so we need to specify the same prefix otherwise it will
+            " think those are different files and we'll end up with duplicate
+            " entries.
+            let l:rel_path = s:normalizepath('./' . expand('%:.'))
+            let l:cmd .= ' --source "' . l:rel_path . '"'
+        endif
+        if g:autotags_trace
+            let l:cmd .= ' --log "' . fnamemodify(l:tags_file, ':t') . '.log"'
+        endif
+        call s:trace("Running: " . l:cmd)
+        call s:trace("In:      " . l:work_dir)
+        if !g:autotags_fake
+            if !g:autotags_trace
+                silent execute l:cmd
+            else
+                execute l:cmd
+            endif
+        else
+            call s:trace("(fake... not actually running)")
+        endif
+        call s:trace("")
+    finally
+        " Restore the current directory...
+        execute "chdir " . l:prev_cwd
+    endtry
+endfunction
+
+" }}}
+
+" Manual Tagfile Generation {{{
+
+function! s:generate_tags(bang, ...) abort
+    call s:update_tags(1, 0, a:1)
+endfunction
+
+command! -bang -nargs=1 -complete=file AutotagsGenerate :call s:generate_tags(<bang>0, <f-args>)
+
+" }}}
+
+" Toggles {{{
+
+command! AutotagsToggleEnabled :let g:autotags_enabled=!g:autotags_enabled
+command! AutotagsToggleTrace   :call autotags#trace()
+command! AutotagsToggleFake    :call autotags#fake()
+command! AutotagsUnlock        :call delete(b:autotags_file . '.lock')
+
+" }}}
+
+" Autoload Functions {{{
+
+function! autotags#rescan(...)
+    if exists('b:autotags_file')
+        unlet b:autotags_file
+    endif
+    if a:0 && a:1
+        let l:trace_backup = g:autotags_trace
+        let l:autotags_trace = 1
+    endif
+    call s:setup_autotags()
+    if a:0 && a:1
+        let g:autotags_trace = l:trace_backup
+    endif
+endfunction
+
+function! autotags#trace(...)
+    let g:autotags_trace = !g:autotags_trace
+    if a:0 > 0
+        let g:autotags_trace = a:1
+    endif
+    if g:autotags_trace
+        echom "autotags: Tracing is enabled."
+    else
+        echom "autotags: Tracing is disabled."
+    endif
+    echom ""
+endfunction
+
+function! autotags#fake(...)
+    let g:autotags_fake = !g:autotags_fake
+    if a:0 > 0
+        let g:autotags_fake = a:1
+    endif
+    if g:autotags_fake
+        echom "autotags: Now faking autotags."
+    else
+        echom "autotags: Now running autotags for real."
+    endif
+    echom ""
+endfunction
+
+" }}}
+