vim: use try catch in vim plugin to avoid conflicts

contrib/vim/hgcommand.vim

@@ -1,1703 +1,1703
 " vim600: set foldmethod=marker:
 "
 " Vim plugin to assist in working with HG-controlled files.
 "
 " Last Change:   2006/02/22
 " Version:       1.77
 " Maintainer:    Mathieu Clabaut <[e-mail]>
 " License:       This file is placed in the public domain.
 " Credits:
 "                Bob Hiestand <[e-mail]> for the fabulous
 "                cvscommand.vim from which this script was directly created by
 "                means of sed commands and minor tweaks.
 " Note:
 "                For Vim7 the use of Bob Hiestand's vcscommand.vim
 "                <http://www.vim.org/scripts/script.php?script_id=90>
 "                in conjunction with Vladmir Marek's Hg backend
 "                <http://www.vim.org/scripts/script.php?script_id=1898>
 "                is recommended.
 
 """""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""
 "
 " Section: Documentation
 "----------------------------
 "
 " Documentation should be available by ":help hgcommand" command, once the
 " script has been copied in you .vim/plugin directory.
 "
 " You still can read the documentation at the end of this file. Locate it by
 " searching the "hgcommand-contents" string (and set ft=help to have
 " appropriate syntactic coloration).
 
 " Section: Plugin header {{{1
 
 " loaded_hgcommand is set to 1 when the initialization begins, and 2 when it
 " completes.  This allows various actions to only be taken by functions after
 " system initialization.
 
 if exists("g:loaded_hgcommand")
    finish
 endif
 let g:loaded_hgcommand = 1
 
 " store 'compatible' settings
 let s:save_cpo = &cpo
 set cpo&vim
 
 " run checks
 let s:script_name = expand("<sfile>:t:r")
 
 function! s:HGCleanupOnFailure(err)
   echohl WarningMsg
   echomsg s:script_name . ":" a:err "Plugin not loaded"
   echohl None
   let g:loaded_hgcommand = "no"
   unlet s:save_cpo s:script_name
 endfunction
 
 if v:version < 602
   call <SID>HGCleanupOnFailure("VIM 6.2 or later required.")
   finish
 endif
 
 if !exists("*system")
   call <SID>HGCleanupOnFailure("builtin system() function required.")
   finish
 endif
 
 let s:script_version = "v0.2"
 
 " Section: Event group setup {{{1
 
 augroup HGCommand
 augroup END
 
 " Section: Plugin initialization {{{1
 silent do HGCommand User HGPluginInit
 
 " Section: Script variable initialization {{{1
 
 let s:HGCommandEditFileRunning = 0
 unlet! s:vimDiffRestoreCmd
 unlet! s:vimDiffSourceBuffer
 unlet! s:vimDiffBufferCount
 unlet! s:vimDiffScratchList
 
 " Section: Utility functions {{{1
 
 " Function: s:HGResolveLink() {{{2
 " Fully resolve the given file name to remove shortcuts or symbolic links.
 
 function! s:HGResolveLink(fileName)
   let resolved = resolve(a:fileName)
   if resolved != a:fileName
     let resolved = <SID>HGResolveLink(resolved)
   endif
   return resolved
 endfunction
 
 " Function: s:HGChangeToCurrentFileDir() {{{2
 " Go to the directory in which the current HG-controlled file is located.
 " If this is a HG command buffer, first switch to the original file.
 
 function! s:HGChangeToCurrentFileDir(fileName)
   let oldCwd=getcwd()
   let fileName=<SID>HGResolveLink(a:fileName)
   let newCwd=fnamemodify(fileName, ':h')
   if strlen(newCwd) > 0
-    execute 'cd' escape(newCwd, ' ')
+    try | execute 'cd' escape(newCwd, ' ') | catch | | endtry
   endif
   return oldCwd
 endfunction
 
 " Function: <SID>HGGetOption(name, default) {{{2
 " Grab a user-specified option to override the default provided.  Options are
 " searched in the window, buffer, then global spaces.
 
 function! s:HGGetOption(name, default)
   if exists("s:" . a:name . "Override")
     execute "return s:".a:name."Override"
   elseif exists("w:" . a:name)
     execute "return w:".a:name
   elseif exists("b:" . a:name)
     execute "return b:".a:name
   elseif exists("g:" . a:name)
     execute "return g:".a:name
   else
     return a:default
   endif
 endfunction
 
 " Function: s:HGEditFile(name, origBuffNR) {{{2
 " Wrapper around the 'edit' command to provide some helpful error text if the
 " current buffer can't be abandoned.  If name is provided, it is used;
 " otherwise, a nameless scratch buffer is used.
 " Returns: 0 if successful, -1 if an error occurs.
 
 function! s:HGEditFile(name, origBuffNR)
   "Name parameter will be pasted into expression.
   let name = escape(a:name, ' *?\')
 
   let editCommand = <SID>HGGetOption('HGCommandEdit', 'edit')
   if editCommand != 'edit'
     if <SID>HGGetOption('HGCommandSplit', 'horizontal') == 'horizontal'
       if name == ""
         let editCommand = 'rightbelow new'
       else
         let editCommand = 'rightbelow split ' . name
       endif
     else
       if name == ""
         let editCommand = 'vert rightbelow new'
       else
         let editCommand = 'vert rightbelow split ' . name
       endif
     endif
   else
     if name == ""
       let editCommand = 'enew'
     else
       let editCommand = 'edit ' . name
     endif
   endif
 
   " Protect against useless buffer set-up
   let s:HGCommandEditFileRunning = s:HGCommandEditFileRunning + 1
   try
     execute editCommand
   finally
     let s:HGCommandEditFileRunning = s:HGCommandEditFileRunning - 1
   endtry
 
   let b:HGOrigBuffNR=a:origBuffNR
   let b:HGCommandEdit='split'
 endfunction
 
 " Function: s:HGCreateCommandBuffer(cmd, cmdName, statusText, filename) {{{2
 " Creates a new scratch buffer and captures the output from execution of the
 " given command.  The name of the scratch buffer is returned.
 
 function! s:HGCreateCommandBuffer(cmd, cmdName, statusText, origBuffNR)
   let fileName=bufname(a:origBuffNR)
 
   let resultBufferName=''
 
   if <SID>HGGetOption("HGCommandNameResultBuffers", 0)
     let nameMarker = <SID>HGGetOption("HGCommandNameMarker", '_')
     if strlen(a:statusText) > 0
       let bufName=a:cmdName . ' -- ' . a:statusText
     else
       let bufName=a:cmdName
     endif
     let bufName=fileName . ' ' . nameMarker . bufName . nameMarker
     let counter=0
     let resultBufferName = bufName
     while buflisted(resultBufferName)
       let counter=counter + 1
       let resultBufferName=bufName . ' (' . counter . ')'
     endwhile
   endif
 
   let hgCommand = <SID>HGGetOption("HGCommandHGExec", "hg") . " " . a:cmd
   "echomsg "DBG :".hgCommand
   let hgOut = system(hgCommand)
   " HACK:  diff command does not return proper error codes
   if v:shell_error && a:cmdName != 'hgdiff'
     if strlen(hgOut) == 0
       echoerr "HG command failed"
     else
       echoerr "HG command failed:  " . hgOut
     endif
     return -1
   endif
   if strlen(hgOut) == 0
     " Handle case of no output.  In this case, it is important to check the
     " file status, especially since hg edit/unedit may change the attributes
     " of the file with no visible output.
 
     echomsg "No output from HG command"
     checktime
     return -1
   endif
 
   if <SID>HGEditFile(resultBufferName, a:origBuffNR) == -1
     return -1
   endif
 
   set buftype=nofile
   set noswapfile
   set filetype=
 
   if <SID>HGGetOption("HGCommandDeleteOnHide", 0)
     set bufhidden=delete
   endif
 
   silent 0put=hgOut
 
   " The last command left a blank line at the end of the buffer.  If the
   " last line is folded (a side effect of the 'put') then the attempt to
   " remove the blank line will kill the last fold.
   "
   " This could be fixed by explicitly detecting whether the last line is
   " within a fold, but I prefer to simply unfold the result buffer altogether.
 
   if has("folding")
     setlocal nofoldenable
   endif
 
   $d
   1
 
   " Define the environment and execute user-defined hooks.
 
   let b:HGSourceFile=fileName
   let b:HGCommand=a:cmdName
   if a:statusText != ""
     let b:HGStatusText=a:statusText
   endif
 
   silent do HGCommand User HGBufferCreated
   return bufnr("%")
 endfunction
 
 " Function: s:HGBufferCheck(hgBuffer) {{{2
 " Attempts to locate the original file to which HG operations were applied
 " for a given buffer.
 
 function! s:HGBufferCheck(hgBuffer)
   let origBuffer = getbufvar(a:hgBuffer, "HGOrigBuffNR")
   if origBuffer
     if bufexists(origBuffer)
       return origBuffer
     else
       " Original buffer no longer exists.
       return -1
     endif
   else
     " No original buffer
     return a:hgBuffer
   endif
 endfunction
 
 " Function: s:HGCurrentBufferCheck() {{{2
 " Attempts to locate the original file to which HG operations were applied
 " for the current buffer.
 
 function! s:HGCurrentBufferCheck()
   return <SID>HGBufferCheck(bufnr("%"))
 endfunction
 
 " Function: s:HGToggleDeleteOnHide() {{{2
 " Toggles on and off the delete-on-hide behavior of HG buffers
 
 function! s:HGToggleDeleteOnHide()
   if exists("g:HGCommandDeleteOnHide")
     unlet g:HGCommandDeleteOnHide
   else
     let g:HGCommandDeleteOnHide=1
   endif
 endfunction
 
 " Function: s:HGDoCommand(hgcmd, cmdName, statusText) {{{2
 " General skeleton for HG function execution.
 " Returns: name of the new command buffer containing the command results
 
 function! s:HGDoCommand(cmd, cmdName, statusText)
   let hgBufferCheck=<SID>HGCurrentBufferCheck()
   if hgBufferCheck == -1
     echo "Original buffer no longer exists, aborting."
     return -1
   endif
 
   let fileName=bufname(hgBufferCheck)
   if isdirectory(fileName)
     let fileName=fileName . "/" . getline(".")
   endif
   let realFileName = fnamemodify(<SID>HGResolveLink(fileName), ':t')
   let oldCwd=<SID>HGChangeToCurrentFileDir(fileName)
   try
      " TODO
     "if !filereadable('HG/Root')
       "throw fileName . ' is not a HG-controlled file.'
     "endif
     let fullCmd = a:cmd . ' "' . realFileName . '"'
     "echomsg "DEBUG".fullCmd
     let resultBuffer=<SID>HGCreateCommandBuffer(fullCmd, a:cmdName, a:statusText, hgBufferCheck)
     return resultBuffer
   catch
     echoerr v:exception
     return -1
   finally
     execute 'cd' escape(oldCwd, ' ')
   endtry
 endfunction
 
 
 " Function: s:HGGetStatusVars(revision, branch, repository) {{{2
 "
 " Obtains a HG revision number and branch name.  The 'revisionVar',
 " 'branchVar'and 'repositoryVar' arguments, if non-empty, contain the names of variables to hold
 " the corresponding results.
 "
 " Returns: string to be exec'd that sets the multiple return values.
 
 function! s:HGGetStatusVars(revisionVar, branchVar, repositoryVar)
   let hgBufferCheck=<SID>HGCurrentBufferCheck()
   "echomsg "DBG : in HGGetStatusVars"
   if hgBufferCheck == -1
     return ""
   endif
   let fileName=bufname(hgBufferCheck)
   let fileNameWithoutLink=<SID>HGResolveLink(fileName)
   let realFileName = fnamemodify(fileNameWithoutLink, ':t')
   let oldCwd=<SID>HGChangeToCurrentFileDir(realFileName)
   try
     let hgCommand = <SID>HGGetOption("HGCommandHGExec", "hg") . " root  "
     let roottext=system(hgCommand)
     " Suppress ending null char ! Does it work in window ?
     let roottext=substitute(roottext,'^.*/\([^/\n\r]*\)\n\_.*$','\1','')
     if match(getcwd()."/".fileNameWithoutLink, roottext) == -1
       return ""
     endif
     let returnExpression = ""
     if a:repositoryVar != ""
       let returnExpression=returnExpression . " | let " . a:repositoryVar . "='" . roottext . "'"
     endif
     let hgCommand = <SID>HGGetOption("HGCommandHGExec", "hg") . " status -mardui " . realFileName
     let statustext=system(hgCommand)
     if(v:shell_error)
       return ""
     endif
     if match(statustext, '^[?I]') >= 0
       let revision="NEW"
     elseif match(statustext, '^[R]') >= 0
       let revision="REMOVED"
     elseif match(statustext, '^[D]') >= 0
       let revision="DELETED"
     elseif match(statustext, '^[A]') >= 0
       let revision="ADDED"
     else
       " The file is tracked, we can try to get is revision number
       let hgCommand = <SID>HGGetOption("HGCommandHGExec", "hg") . " parents "
       let statustext=system(hgCommand)
       if(v:shell_error)
           return ""
       endif
       let revision=substitute(statustext, '^changeset:\s*\(\d\+\):.*\_$\_.*$', '\1', "")
 
       if a:branchVar != "" && match(statustext, '^\_.*\_^branch:') >= 0
         let branch=substitute(statustext, '^\_.*\_^branch:\s*\(\S\+\)\n\_.*$', '\1', "")
         let returnExpression=returnExpression . " | let " . a:branchVar . "='" . branch . "'"
       endif
     endif
     if (exists('revision'))
       let returnExpression = "let " . a:revisionVar . "='" . revision . "' " . returnExpression
     endif
 
     return returnExpression
   finally
-    execute 'cd' escape(oldCwd, ' ')
+    try | execute 'cd' escape(oldCwd, ' ') | catch | | endtry
   endtry
 endfunction
 
 " Function: s:HGSetupBuffer() {{{2
 " Attempts to set the b:HGBranch, b:HGRevision and b:HGRepository variables.
 
 function! s:HGSetupBuffer(...)
   if (exists("b:HGBufferSetup") && b:HGBufferSetup && !exists('a:1'))
     " This buffer is already set up.
     return
   endif
 
   if !<SID>HGGetOption("HGCommandEnableBufferSetup", 0)
         \ || @% == ""
         \ || s:HGCommandEditFileRunning > 0
         \ || exists("b:HGOrigBuffNR")
     unlet! b:HGRevision
     unlet! b:HGBranch
     unlet! b:HGRepository
     return
   endif
 
   if !filereadable(expand("%"))
     return -1
   endif
 
   let revision=""
   let branch=""
   let repository=""
 
   exec <SID>HGGetStatusVars('revision', 'branch', 'repository')
   "echomsg "DBG ".revision."#".branch."#".repository
   if revision != ""
     let b:HGRevision=revision
   else
     unlet! b:HGRevision
   endif
   if branch != ""
     let b:HGBranch=branch
   else
     unlet! b:HGBranch
   endif
   if repository != ""
      let b:HGRepository=repository
   else
      unlet! b:HGRepository
   endif
   silent do HGCommand User HGBufferSetup
   let b:HGBufferSetup=1
 endfunction
 
 " Function: s:HGMarkOrigBufferForSetup(hgbuffer) {{{2
 " Resets the buffer setup state of the original buffer for a given HG buffer.
 " Returns:  The HG buffer number in a passthrough mode.
 
 function! s:HGMarkOrigBufferForSetup(hgBuffer)
   checktime
   if a:hgBuffer != -1
     let origBuffer = <SID>HGBufferCheck(a:hgBuffer)
     "This should never not work, but I'm paranoid
     if origBuffer != a:hgBuffer
       call setbufvar(origBuffer, "HGBufferSetup", 0)
     endif
   else
     "We are presumably in the original buffer
     let b:HGBufferSetup = 0
     "We do the setup now as now event will be triggered allowing it later.
     call <SID>HGSetupBuffer()
   endif
   return a:hgBuffer
 endfunction
 
 " Function: s:HGOverrideOption(option, [value]) {{{2
 " Provides a temporary override for the given HG option.  If no value is
 " passed, the override is disabled.
 
 function! s:HGOverrideOption(option, ...)
   if a:0 == 0
     unlet! s:{a:option}Override
   else
     let s:{a:option}Override = a:1
   endif
 endfunction
 
 " Function: s:HGWipeoutCommandBuffers() {{{2
 " Clears all current HG buffers of the specified type for a given source.
 
 function! s:HGWipeoutCommandBuffers(originalBuffer, hgCommand)
   let buffer = 1
   while buffer <= bufnr('$')
     if getbufvar(buffer, 'HGOrigBuffNR') == a:originalBuffer
       if getbufvar(buffer, 'HGCommand') == a:hgCommand
         execute 'bw' buffer
       endif
     endif
     let buffer = buffer + 1
   endwhile
 endfunction
 
 " Function: s:HGInstallDocumentation(full_name, revision)              {{{2
 "   Install help documentation.
 " Arguments:
 "   full_name: Full name of this vim plugin script, including path name.
 "   revision:  Revision of the vim script. #version# mark in the document file
 "              will be replaced with this string with 'v' prefix.
 " Return:
 "   1 if new document installed, 0 otherwise.
 " Note: Cleaned and generalized by guo-peng Wen
 "'''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
 " Helper function to make mkdir as portable as possible
 function! s:HGFlexiMkdir(dir)
   if exists("*mkdir") " we can use Vim's own mkdir()
     call mkdir(a:dir)
   elseif !exists("+shellslash")
     call system("mkdir -p '".a:dir."'")
   else " M$
     let l:ssl = &shellslash
     try
       set shellslash
       " no single quotes?
       call system('mkdir "'.a:dir.'"')
     finally
       let &shellslash = l:ssl
     endtry
   endif
 endfunction
 
 function! s:HGInstallDocumentation(full_name)
   " Figure out document path based on full name of this script:
   let l:vim_doc_path = fnamemodify(a:full_name, ":h:h") . "/doc"
   if filewritable(l:vim_doc_path) != 2
     echomsg s:script_name . ": Trying to update docs at" l:vim_doc_path
     silent! call <SID>HGFlexiMkdir(l:vim_doc_path)
     if filewritable(l:vim_doc_path) != 2
       " Try first item in 'runtimepath':
       let l:vim_doc_path =
             \ substitute(&runtimepath, '^\([^,]*\).*', '\1/doc', 'e')
       if filewritable(l:vim_doc_path) != 2
         echomsg s:script_name . ": Trying to update docs at" l:vim_doc_path
         silent! call <SID>HGFlexiMkdir(l:vim_doc_path)
         if filewritable(l:vim_doc_path) != 2
           " Put a warning:
           echomsg "Unable to open documentation directory"
           echomsg " type `:help add-local-help' for more information."
           return 0
         endif
       endif
     endif
   endif
 
   " Full name of documentation file:
   let l:doc_file =
         \ l:vim_doc_path . "/" . s:script_name . ".txt"
   " Bail out if document file is still up to date:
   if filereadable(l:doc_file)  &&
         \ getftime(a:full_name) < getftime(l:doc_file)
     return 0
   endif
 
   " temporary global settings
   let l:lz = &lazyredraw
   let l:hls = &hlsearch
   set lazyredraw nohlsearch
   " Create a new buffer & read in the plugin file (me):
   1 new
   setlocal noswapfile modifiable nomodeline
   if has("folding")
     setlocal nofoldenable
   endif
   silent execute "read" escape(a:full_name, " ")
   let l:doc_buf = bufnr("%")
 
   1
   " Delete from first line to a line starts with
   " === START_DOC
   silent 1,/^=\{3,}\s\+START_DOC\C/ delete _
   " Delete from a line starts with
   " === END_DOC
   " to the end of the documents:
   silent /^=\{3,}\s\+END_DOC\C/,$ delete _
 
   " Add modeline for help doc: the modeline string is mangled intentionally
   " to avoid it be recognized by VIM:
   call append(line("$"), "")
   call append(line("$"), " v" . "im:tw=78:ts=8:ft=help:norl:")
 
   " Replace revision:
   silent execute "normal :1s/#version#/" . s:script_version . "/\<CR>"
   " Save the help document and wipe out buffer:
   silent execute "wq!" escape(l:doc_file, " ") "| bw" l:doc_buf
   " Build help tags:
   silent execute "helptags" l:vim_doc_path
 
   let &hlsearch = l:hls
   let &lazyredraw = l:lz
   return 1
 endfunction
 
 " Section: Public functions {{{1
 
 " Function: HGGetRevision() {{{2
 " Global function for retrieving the current buffer's HG revision number.
 " Returns: Revision number or an empty string if an error occurs.
 
 function! HGGetRevision()
   let revision=""
   exec <SID>HGGetStatusVars('revision', '', '')
   return revision
 endfunction
 
 " Function: HGDisableBufferSetup() {{{2
 " Global function for deactivating the buffer autovariables.
 
 function! HGDisableBufferSetup()
   let g:HGCommandEnableBufferSetup=0
   silent! augroup! HGCommandPlugin
 endfunction
 
 " Function: HGEnableBufferSetup() {{{2
 " Global function for activating the buffer autovariables.
 
 function! HGEnableBufferSetup()
   let g:HGCommandEnableBufferSetup=1
   augroup HGCommandPlugin
     au!
     au BufEnter * call <SID>HGSetupBuffer()
     au BufWritePost * call <SID>HGSetupBuffer()
     " Force resetting up buffer on external file change (HG update)
     au FileChangedShell * call <SID>HGSetupBuffer(1)
   augroup END
 
   " Only auto-load if the plugin is fully loaded.  This gives other plugins a
   " chance to run.
   if g:loaded_hgcommand == 2
     call <SID>HGSetupBuffer()
   endif
 endfunction
 
 " Function: HGGetStatusLine() {{{2
 " Default (sample) status line entry for HG files.  This is only useful if
 " HG-managed buffer mode is on (see the HGCommandEnableBufferSetup variable
 " for how to do this).
 
 function! HGGetStatusLine()
   if exists('b:HGSourceFile')
     " This is a result buffer
     let value='[' . b:HGCommand . ' ' . b:HGSourceFile
     if exists('b:HGStatusText')
       let value=value . ' ' . b:HGStatusText
     endif
     let value = value . ']'
     return value
   endif
 
   if exists('b:HGRevision')
         \ && b:HGRevision != ''
         \ && exists('b:HGRepository')
         \ && b:HGRepository != ''
         \ && exists('g:HGCommandEnableBufferSetup')
         \ && g:HGCommandEnableBufferSetup
     if !exists('b:HGBranch')
       let l:branch=''
     else
       let l:branch=b:HGBranch
     endif
     return '[HG ' . b:HGRepository . '/' . l:branch .'/' . b:HGRevision . ']'
   else
     return ''
   endif
 endfunction
 
 " Section: HG command functions {{{1
 
 " Function: s:HGAdd() {{{2
 function! s:HGAdd()
   return <SID>HGMarkOrigBufferForSetup(<SID>HGDoCommand('add', 'hgadd', ''))
 endfunction
 
 " Function: s:HGAnnotate(...) {{{2
 function! s:HGAnnotate(...)
   if a:0 == 0
     if &filetype == "HGAnnotate"
       " This is a HGAnnotate buffer.  Perform annotation of the version
       " indicated by the current line.
       let revision = substitute(getline("."),'\(^[0-9]*\):.*','\1','')
       if <SID>HGGetOption('HGCommandAnnotateParent', 0) != 0 && revision > 0
         let revision = revision - 1
       endif
     else
       let revision=HGGetRevision()
       if revision == ""
         echoerr "Unable to obtain HG version information."
         return -1
       endif
     endif
   else
     let revision=a:1
   endif
 
   if revision == "NEW"
     echo "No annotatation available for new file."
     return -1
   endif
 
   let resultBuffer=<SID>HGDoCommand('annotate -ndu -r ' . revision, 'hgannotate', revision)
   "echomsg "DBG: ".resultBuffer
   if resultBuffer !=  -1
     set filetype=HGAnnotate
   endif
 
   return resultBuffer
 endfunction
 
 " Function: s:HGCommit() {{{2
 function! s:HGCommit(...)
   " Handle the commit message being specified.  If a message is supplied, it
   " is used; if bang is supplied, an empty message is used; otherwise, the
   " user is provided a buffer from which to edit the commit message.
   if a:2 != "" || a:1 == "!"
     return <SID>HGMarkOrigBufferForSetup(<SID>HGDoCommand('commit -m "' . a:2 . '"', 'hgcommit', ''))
   endif
 
   let hgBufferCheck=<SID>HGCurrentBufferCheck()
   if hgBufferCheck ==  -1
     echo "Original buffer no longer exists, aborting."
     return -1
   endif
 
   " Protect against windows' backslashes in paths.  They confuse exec'd
   " commands.
 
   let shellSlashBak = &shellslash
   try
     set shellslash
 
     let messageFileName = tempname()
 
     let fileName=bufname(hgBufferCheck)
     let realFilePath=<SID>HGResolveLink(fileName)
     let newCwd=fnamemodify(realFilePath, ':h')
     if strlen(newCwd) == 0
       " Account for autochdir being in effect, which will make this blank, but
       " we know we'll be in the current directory for the original file.
       let newCwd = getcwd()
     endif
 
     let realFileName=fnamemodify(realFilePath, ':t')
 
     if <SID>HGEditFile(messageFileName, hgBufferCheck) == -1
       return
     endif
 
     " Protect against case and backslash issues in Windows.
     let autoPattern = '\c' . messageFileName
 
     " Ensure existence of group
     augroup HGCommit
     augroup END
 
     execute 'au HGCommit BufDelete' autoPattern 'call delete("' . messageFileName . '")'
     execute 'au HGCommit BufDelete' autoPattern 'au! HGCommit * ' autoPattern
 
     " Create a commit mapping.  The mapping must clear all autocommands in case
     " it is invoked when HGCommandCommitOnWrite is active, as well as to not
     " invoke the buffer deletion autocommand.
 
     execute 'nnoremap <silent> <buffer> <Plug>HGCommit '.
           \ ':au! HGCommit * ' . autoPattern . '<CR>'.
           \ ':g/^HG:/d<CR>'.
           \ ':update<CR>'.
           \ ':call <SID>HGFinishCommit("' . messageFileName . '",' .
           \                             '"' . newCwd . '",' .
           \                             '"' . realFileName . '",' .
           \                             hgBufferCheck . ')<CR>'
 
     silent 0put ='HG: ----------------------------------------------------------------------'
     silent put =\"HG: Enter Log.  Lines beginning with `HG:' are removed automatically\"
     silent put ='HG: Type <leader>cc (or your own <Plug>HGCommit mapping)'
 
     if <SID>HGGetOption('HGCommandCommitOnWrite', 1) == 1
       execute 'au HGCommit BufWritePre' autoPattern 'g/^HG:/d'
       execute 'au HGCommit BufWritePost' autoPattern 'call <SID>HGFinishCommit("' . messageFileName . '", "' . newCwd . '", "' . realFileName . '", ' . hgBufferCheck . ') | au! * ' autoPattern
       silent put ='HG: or write this buffer'
     endif
 
     silent put ='HG: to finish this commit operation'
     silent put ='HG: ----------------------------------------------------------------------'
     $
     let b:HGSourceFile=fileName
     let b:HGCommand='HGCommit'
     set filetype=hg
   finally
     let &shellslash = shellSlashBak
   endtry
 
 endfunction
 
 " Function: s:HGDiff(...) {{{2
 function! s:HGDiff(...)
   if a:0 == 1
     let revOptions = '-r' . a:1
     let caption = a:1 . ' -> current'
   elseif a:0 == 2
     let revOptions = '-r' . a:1 . ' -r' . a:2
     let caption = a:1 . ' -> ' . a:2
   else
     let revOptions = ''
     let caption = ''
   endif
 
   let hgdiffopt=<SID>HGGetOption('HGCommandDiffOpt', 'w')
 
   if hgdiffopt == ""
     let diffoptionstring=""
   else
     let diffoptionstring=" -" . hgdiffopt . " "
   endif
 
   let resultBuffer = <SID>HGDoCommand('diff ' . diffoptionstring . revOptions , 'hgdiff', caption)
   if resultBuffer != -1
     set filetype=diff
   endif
   return resultBuffer
 endfunction
 
 
 " Function: s:HGGotoOriginal(["!]) {{{2
 function! s:HGGotoOriginal(...)
   let origBuffNR = <SID>HGCurrentBufferCheck()
   if origBuffNR > 0
     let origWinNR = bufwinnr(origBuffNR)
     if origWinNR == -1
       execute 'buffer' origBuffNR
     else
       execute origWinNR . 'wincmd w'
     endif
     if a:0 == 1
       if a:1 == "!"
         let buffnr = 1
         let buffmaxnr = bufnr("$")
         while buffnr <= buffmaxnr
           if getbufvar(buffnr, "HGOrigBuffNR") == origBuffNR
             execute "bw" buffnr
           endif
           let buffnr = buffnr + 1
         endwhile
       endif
     endif
   endif
 endfunction
 
 " Function: s:HGFinishCommit(messageFile, targetDir, targetFile) {{{2
 function! s:HGFinishCommit(messageFile, targetDir, targetFile, origBuffNR)
   if filereadable(a:messageFile)
     let oldCwd=getcwd()
     if strlen(a:targetDir) > 0
       execute 'cd' escape(a:targetDir, ' ')
     endif
     let resultBuffer=<SID>HGCreateCommandBuffer('commit -l "' . a:messageFile . '" "'. a:targetFile . '"', 'hgcommit', '', a:origBuffNR)
     execute 'cd' escape(oldCwd, ' ')
     execute 'bw' escape(a:messageFile, ' *?\')
     silent execute 'call delete("' . a:messageFile . '")'
     return <SID>HGMarkOrigBufferForSetup(resultBuffer)
   else
     echoerr "Can't read message file; no commit is possible."
     return -1
   endif
 endfunction
 
 " Function: s:HGLog() {{{2
 function! s:HGLog(...)
   if a:0 == 0
     let versionOption = ""
     let caption = ''
   else
     let versionOption=" -r" . a:1
     let caption = a:1
   endif
 
   let resultBuffer=<SID>HGDoCommand('log' . versionOption, 'hglog', caption)
   if resultBuffer != ""
     set filetype=rcslog
   endif
   return resultBuffer
 endfunction
 
 " Function: s:HGRevert() {{{2
 function! s:HGRevert()
   return <SID>HGMarkOrigBufferForSetup(<SID>HGDoCommand('revert', 'hgrevert', ''))
 endfunction
 
 " Function: s:HGReview(...) {{{2
 function! s:HGReview(...)
   if a:0 == 0
     let versiontag=""
     if <SID>HGGetOption('HGCommandInteractive', 0)
       let versiontag=input('Revision:  ')
     endif
     if versiontag == ""
       let versiontag="(current)"
       let versionOption=""
     else
       let versionOption=" -r " . versiontag . " "
     endif
   else
     let versiontag=a:1
     let versionOption=" -r " . versiontag . " "
   endif
 
   let resultBuffer = <SID>HGDoCommand('cat' . versionOption, 'hgreview', versiontag)
   if resultBuffer > 0
     let &filetype=getbufvar(b:HGOrigBuffNR, '&filetype')
   endif
 
   return resultBuffer
 endfunction
 
 " Function: s:HGStatus() {{{2
 function! s:HGStatus()
   return <SID>HGDoCommand('status', 'hgstatus', '')
 endfunction
 
 
 " Function: s:HGUpdate() {{{2
 function! s:HGUpdate()
   return <SID>HGMarkOrigBufferForSetup(<SID>HGDoCommand('update', 'update', ''))
 endfunction
 
 " Function: s:HGVimDiff(...) {{{2
 function! s:HGVimDiff(...)
   let originalBuffer = <SID>HGCurrentBufferCheck()
   let s:HGCommandEditFileRunning = s:HGCommandEditFileRunning + 1
   try
     " If there's already a VimDiff'ed window, restore it.
     " There may only be one HGVimDiff original window at a time.
 
     if exists("s:vimDiffSourceBuffer") && s:vimDiffSourceBuffer != originalBuffer
       " Clear the existing vimdiff setup by removing the result buffers.
       call <SID>HGWipeoutCommandBuffers(s:vimDiffSourceBuffer, 'vimdiff')
     endif
 
     " Split and diff
     if(a:0 == 2)
       " Reset the vimdiff system, as 2 explicit versions were provided.
       if exists('s:vimDiffSourceBuffer')
         call <SID>HGWipeoutCommandBuffers(s:vimDiffSourceBuffer, 'vimdiff')
       endif
       let resultBuffer = <SID>HGReview(a:1)
       if resultBuffer < 0
         echomsg "Can't open HG revision " . a:1
         return resultBuffer
       endif
       let b:HGCommand = 'vimdiff'
       diffthis
       let s:vimDiffBufferCount = 1
       let s:vimDiffScratchList = '{'. resultBuffer . '}'
       " If no split method is defined, cheat, and set it to vertical.
       try
         call <SID>HGOverrideOption('HGCommandSplit', <SID>HGGetOption('HGCommandDiffSplit', <SID>HGGetOption('HGCommandSplit', 'vertical')))
         let resultBuffer=<SID>HGReview(a:2)
       finally
         call <SID>HGOverrideOption('HGCommandSplit')
       endtry
       if resultBuffer < 0
         echomsg "Can't open HG revision " . a:1
         return resultBuffer
       endif
       let b:HGCommand = 'vimdiff'
       diffthis
       let s:vimDiffBufferCount = 2
       let s:vimDiffScratchList = s:vimDiffScratchList . '{'. resultBuffer . '}'
     else
       " Add new buffer
       try
         " Force splitting behavior, otherwise why use vimdiff?
         call <SID>HGOverrideOption("HGCommandEdit", "split")
         call <SID>HGOverrideOption("HGCommandSplit", <SID>HGGetOption('HGCommandDiffSplit', <SID>HGGetOption('HGCommandSplit', 'vertical')))
         if(a:0 == 0)
           let resultBuffer=<SID>HGReview()
         else
           let resultBuffer=<SID>HGReview(a:1)
         endif
       finally
         call <SID>HGOverrideOption("HGCommandEdit")
         call <SID>HGOverrideOption("HGCommandSplit")
       endtry
       if resultBuffer < 0
         echomsg "Can't open current HG revision"
         return resultBuffer
       endif
       let b:HGCommand = 'vimdiff'
       diffthis
 
       if !exists('s:vimDiffBufferCount')
         " New instance of vimdiff.
         let s:vimDiffBufferCount = 2
         let s:vimDiffScratchList = '{' . resultBuffer . '}'
 
         " This could have been invoked on a HG result buffer, not the
         " original buffer.
         wincmd W
         execute 'buffer' originalBuffer
         " Store info for later original buffer restore
         let s:vimDiffRestoreCmd =
               \    "call setbufvar(".originalBuffer.", \"&diff\", ".getbufvar(originalBuffer, '&diff').")"
               \ . "|call setbufvar(".originalBuffer.", \"&foldcolumn\", ".getbufvar(originalBuffer, '&foldcolumn').")"
               \ . "|call setbufvar(".originalBuffer.", \"&foldenable\", ".getbufvar(originalBuffer, '&foldenable').")"
               \ . "|call setbufvar(".originalBuffer.", \"&foldmethod\", '".getbufvar(originalBuffer, '&foldmethod')."')"
               \ . "|call setbufvar(".originalBuffer.", \"&scrollbind\", ".getbufvar(originalBuffer, '&scrollbind').")"
               \ . "|call setbufvar(".originalBuffer.", \"&wrap\", ".getbufvar(originalBuffer, '&wrap').")"
               \ . "|if &foldmethod=='manual'|execute 'normal! zE'|endif"
         diffthis
         wincmd w
       else
         " Adding a window to an existing vimdiff
         let s:vimDiffBufferCount = s:vimDiffBufferCount + 1
         let s:vimDiffScratchList = s:vimDiffScratchList . '{' . resultBuffer . '}'
       endif
     endif
 
     let s:vimDiffSourceBuffer = originalBuffer
 
     " Avoid executing the modeline in the current buffer after the autocommand.
 
     let currentBuffer = bufnr('%')
     let saveModeline = getbufvar(currentBuffer, '&modeline')
     try
       call setbufvar(currentBuffer, '&modeline', 0)
       silent do HGCommand User HGVimDiffFinish
     finally
       call setbufvar(currentBuffer, '&modeline', saveModeline)
     endtry
     return resultBuffer
   finally
     let s:HGCommandEditFileRunning = s:HGCommandEditFileRunning - 1
   endtry
 endfunction
 
 " Section: Command definitions {{{1
 " Section: Primary commands {{{2
 com! HGAdd call <SID>HGAdd()
 com! -nargs=? HGAnnotate call <SID>HGAnnotate(<f-args>)
 com! -bang -nargs=? HGCommit call <SID>HGCommit(<q-bang>, <q-args>)
 com! -nargs=* HGDiff call <SID>HGDiff(<f-args>)
 com! -bang HGGotoOriginal call <SID>HGGotoOriginal(<q-bang>)
 com! -nargs=? HGLog call <SID>HGLog(<f-args>)
 com! HGRevert call <SID>HGRevert()
 com! -nargs=? HGReview call <SID>HGReview(<f-args>)
 com! HGStatus call <SID>HGStatus()
 com! HGUpdate call <SID>HGUpdate()
 com! -nargs=* HGVimDiff call <SID>HGVimDiff(<f-args>)
 
 " Section: HG buffer management commands {{{2
 com! HGDisableBufferSetup call HGDisableBufferSetup()
 com! HGEnableBufferSetup call HGEnableBufferSetup()
 
 " Allow reloading hgcommand.vim
 com! HGReload unlet! g:loaded_hgcommand | runtime plugin/hgcommand.vim
 
 " Section: Plugin command mappings {{{1
 nnoremap <silent> <Plug>HGAdd :HGAdd<CR>
 nnoremap <silent> <Plug>HGAnnotate :HGAnnotate<CR>
 nnoremap <silent> <Plug>HGCommit :HGCommit<CR>
 nnoremap <silent> <Plug>HGDiff :HGDiff<CR>
 nnoremap <silent> <Plug>HGGotoOriginal :HGGotoOriginal<CR>
 nnoremap <silent> <Plug>HGClearAndGotoOriginal :HGGotoOriginal!<CR>
 nnoremap <silent> <Plug>HGLog :HGLog<CR>
 nnoremap <silent> <Plug>HGRevert :HGRevert<CR>
 nnoremap <silent> <Plug>HGReview :HGReview<CR>
 nnoremap <silent> <Plug>HGStatus :HGStatus<CR>
 nnoremap <silent> <Plug>HGUpdate :HGUpdate<CR>
 nnoremap <silent> <Plug>HGVimDiff :HGVimDiff<CR>
 
 " Section: Default mappings {{{1
 if !hasmapto('<Plug>HGAdd')
   nmap <unique> <Leader>hga <Plug>HGAdd
 endif
 if !hasmapto('<Plug>HGAnnotate')
   nmap <unique> <Leader>hgn <Plug>HGAnnotate
 endif
 if !hasmapto('<Plug>HGClearAndGotoOriginal')
   nmap <unique> <Leader>hgG <Plug>HGClearAndGotoOriginal
 endif
 if !hasmapto('<Plug>HGCommit')
   nmap <unique> <Leader>hgc <Plug>HGCommit
 endif
 if !hasmapto('<Plug>HGDiff')
   nmap <unique> <Leader>hgd <Plug>HGDiff
 endif
 if !hasmapto('<Plug>HGGotoOriginal')
   nmap <unique> <Leader>hgg <Plug>HGGotoOriginal
 endif
 if !hasmapto('<Plug>HGLog')
   nmap <unique> <Leader>hgl <Plug>HGLog
 endif
 if !hasmapto('<Plug>HGRevert')
   nmap <unique> <Leader>hgq <Plug>HGRevert
 endif
 if !hasmapto('<Plug>HGReview')
   nmap <unique> <Leader>hgr <Plug>HGReview
 endif
 if !hasmapto('<Plug>HGStatus')
   nmap <unique> <Leader>hgs <Plug>HGStatus
 endif
 if !hasmapto('<Plug>HGUpdate')
   nmap <unique> <Leader>hgu <Plug>HGUpdate
 endif
 if !hasmapto('<Plug>HGVimDiff')
   nmap <unique> <Leader>hgv <Plug>HGVimDiff
 endif
 
 " Section: Menu items {{{1
 silent! aunmenu Plugin.HG
 amenu <silent> &Plugin.HG.&Add        <Plug>HGAdd
 amenu <silent> &Plugin.HG.A&nnotate   <Plug>HGAnnotate
 amenu <silent> &Plugin.HG.&Commit     <Plug>HGCommit
 amenu <silent> &Plugin.HG.&Diff       <Plug>HGDiff
 amenu <silent> &Plugin.HG.&Log        <Plug>HGLog
 amenu <silent> &Plugin.HG.Revert      <Plug>HGRevert
 amenu <silent> &Plugin.HG.&Review     <Plug>HGReview
 amenu <silent> &Plugin.HG.&Status     <Plug>HGStatus
 amenu <silent> &Plugin.HG.&Update     <Plug>HGUpdate
 amenu <silent> &Plugin.HG.&VimDiff    <Plug>HGVimDiff
 
 " Section: Autocommands to restore vimdiff state {{{1
 function! s:HGVimDiffRestore(vimDiffBuff)
   let s:HGCommandEditFileRunning = s:HGCommandEditFileRunning + 1
   try
     if exists("s:vimDiffSourceBuffer")
       if a:vimDiffBuff == s:vimDiffSourceBuffer
         " Original file is being removed.
         unlet! s:vimDiffSourceBuffer
         unlet! s:vimDiffBufferCount
         unlet! s:vimDiffRestoreCmd
         unlet! s:vimDiffScratchList
       elseif match(s:vimDiffScratchList, '{' . a:vimDiffBuff . '}') >= 0
         let s:vimDiffScratchList = substitute(s:vimDiffScratchList, '{' . a:vimDiffBuff . '}', '', '')
         let s:vimDiffBufferCount = s:vimDiffBufferCount - 1
         if s:vimDiffBufferCount == 1 && exists('s:vimDiffRestoreCmd')
           " All scratch buffers are gone, reset the original.
           " Only restore if the source buffer is still in Diff mode
 
           let sourceWinNR=bufwinnr(s:vimDiffSourceBuffer)
           if sourceWinNR != -1
             " The buffer is visible in at least one window
             let currentWinNR = winnr()
             while winbufnr(sourceWinNR) != -1
               if winbufnr(sourceWinNR) == s:vimDiffSourceBuffer
                 execute sourceWinNR . 'wincmd w'
                 if getwinvar('', "&diff")
                   execute s:vimDiffRestoreCmd
                 endif
               endif
               let sourceWinNR = sourceWinNR + 1
             endwhile
             execute currentWinNR . 'wincmd w'
           else
             " The buffer is hidden.  It must be visible in order to set the
             " diff option.
             let currentBufNR = bufnr('')
             execute "hide buffer" s:vimDiffSourceBuffer
             if getwinvar('', "&diff")
               execute s:vimDiffRestoreCmd
             endif
             execute "hide buffer" currentBufNR
           endif
 
           unlet s:vimDiffRestoreCmd
           unlet s:vimDiffSourceBuffer
           unlet s:vimDiffBufferCount
           unlet s:vimDiffScratchList
         elseif s:vimDiffBufferCount == 0
           " All buffers are gone.
           unlet s:vimDiffSourceBuffer
           unlet s:vimDiffBufferCount
           unlet s:vimDiffScratchList
         endif
       endif
     endif
   finally
     let s:HGCommandEditFileRunning = s:HGCommandEditFileRunning - 1
   endtry
 endfunction
 
 augroup HGVimDiffRestore
   au!
   au BufUnload * call <SID>HGVimDiffRestore(expand("<abuf>"))
 augroup END
 
 " Section: Optional activation of buffer management {{{1
 
 if s:HGGetOption('HGCommandEnableBufferSetup', 1)
   call HGEnableBufferSetup()
 endif
 
 " Section: Doc installation {{{1
 
 if <SID>HGInstallDocumentation(expand("<sfile>:p"))
   echomsg s:script_name s:script_version . ": updated documentation"
 endif
 
 " Section: Plugin completion {{{1
 
 " delete one-time vars and functions
 delfunction <SID>HGInstallDocumentation
 delfunction <SID>HGFlexiMkdir
 delfunction <SID>HGCleanupOnFailure
 unlet s:script_version s:script_name
 
 let g:loaded_hgcommand=2
 silent do HGCommand User HGPluginFinish
 
 let &cpo = s:save_cpo
 unlet s:save_cpo
 " vim:se expandtab sts=2 sw=2:
 finish
 
 """"""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""
 " Section: Documentation content                                          {{{1
 """"""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""
 === START_DOC
 *hgcommand.txt*	  Mercurial vim integration		             #version#
 
 
 			 HGCOMMAND REFERENCE MANUAL~
 
 
 Author:  Mathieu Clabaut <[e-mail]>
 Credits:  Bob Hiestand <[e-mail]>
 Mercurial: http://mercurial.selenic.com/
    Mercurial (noted Hg) is a fast, lightweight Source Control Management
    system designed for efficient handling of very large distributed projects.
 
 ==============================================================================
 1. Contents						  *hgcommand-contents*
 
 	Installation		: |hgcommand-install|
         HGCommand Intro	        : |hgcommand|
 	HGCommand Manual	: |hgcommand-manual|
 	Customization		: |hgcommand-customize|
 	Bugs			: |hgcommand-bugs|
 
 ==============================================================================
 2. HGCommand Installation				   *hgcommand-install*
 
    In order to install the plugin, place the hgcommand.vim file into a plugin'
    directory in your runtime path (please see |add-global-plugin| and
    |'runtimepath'|.
 
    HGCommand may be customized by setting variables, creating maps, and
    specifying event handlers.  Please see |hgcommand-customize| for more
    details.
 
                                                          *hgcommand-auto-help*
    The help file is automagically generated when the |hgcommand| script is
    loaded for the first time.
 
 ==============================================================================
 
 3. HGCommand Intro					           *hgcommand*
                                                              *hgcommand-intro*
 
    The HGCommand plugin provides global ex commands for manipulating
    HG-controlled source files.  In general, each command operates on the
    current buffer and accomplishes a separate hg function, such as update,
    commit, log, and others (please see |hgcommand-commands| for a list of all
    available commands).  The results of each operation are displayed in a
    scratch buffer.  Several buffer variables are defined for those scratch
    buffers (please see |hgcommand-buffer-variables|).
 
    The notion of "current file" means either the current buffer, or, in the
    case of a directory buffer, the file on the current line within the buffer.
 
    For convenience, any HGCommand invoked on a HGCommand scratch buffer acts
    as though it was invoked on the original file and splits the screen so that
    the output appears in a new window.
 
    Many of the commands accept revisions as arguments.  By default, most
    operate on the most recent revision on the current branch if no revision is
    specified (though see |HGCommandInteractive| to prompt instead).
 
    Each HGCommand is mapped to a key sequence starting with the <Leader>
    keystroke.  The default mappings may be overridden by supplying different
    mappings before the plugin is loaded, such as in the vimrc, in the standard
    fashion for plugin mappings.  For examples, please see
    |hgcommand-mappings-override|.
 
    The HGCommand plugin may be configured in several ways.  For more details,
    please see |hgcommand-customize|.
 
 ==============================================================================
 4. HGCommand Manual					    *hgcommand-manual*
 
 4.1 HGCommand commands					  *hgcommand-commands*
 
    HGCommand defines the following commands:
 
       |:HGAdd|
       |:HGAnnotate|
       |:HGCommit|
       |:HGDiff|
       |:HGGotoOriginal|
       |:HGLog|
       |:HGRevert|
       |:HGReview|
       |:HGStatus|
       |:HGUpdate|
       |:HGVimDiff|
 
 :HGAdd							              *:HGAdd*
 
    This command performs "hg add" on the current file.  Please note, this does
    not commit the newly-added file.
 
 :HGAnnotate						         *:HGAnnotate*
 
    This command performs "hg annotate" on the current file.  If an argument is
    given, the argument is used as a revision number to display.  If not given
    an argument, it uses the most recent version of the file on the current
    branch.  Additionally, if the current buffer is a HGAnnotate buffer
    already, the version number on the current line is used.
 
    If the |HGCommandAnnotateParent| variable is set to a non-zero value, the
    version previous to the one on the current line is used instead.  This
    allows one to navigate back to examine the previous version of a line.
 
    The filetype of the HGCommand scratch buffer is set to 'HGAnnotate', to
    take advantage of the bundled syntax file.
 
 
 :HGCommit[!]						           *:HGCommit*
 
    If called with arguments, this performs "hg commit" using the arguments as
    the log message.
 
    If '!' is used with no arguments, an empty log message is committed.
 
    If called with no arguments, this is a two-step command.  The first step
    opens a buffer to accept a log message.  When that buffer is written, it is
    automatically closed and the file is committed using the information from
    that log message.  The commit can be abandoned if the log message buffer is
    deleted or wiped before being written.
 
    Alternatively, the mapping that is used to invoke :HGCommit (by default
    <Leader>hgc) can be used in the log message buffer to immediately commit.
    This is useful if the |HGCommandCommitOnWrite| variable is set to 0 to
    disable the normal commit-on-write behavior.
 
 :HGDiff						                     *:HGDiff*
 
    With no arguments, this performs "hg diff" on the current file against the
    current repository version.
 
    With one argument, "hg diff" is performed on the current file against the
    specified revision.
 
    With two arguments, hg diff is performed between the specified revisions of
    the current file.
 
    This command uses the 'HGCommandDiffOpt' variable to specify diff options.
    If that variable does not exist, then 'wbBc' is assumed.  If you wish to
    have no options, then set it to the empty string.
 
 
 :HGGotoOriginal					             *:HGGotoOriginal*
 
    This command returns the current window to the source buffer, if the
    current buffer is a HG command output buffer.
 
 :HGGotoOriginal!
 
    Like ":HGGotoOriginal" but also executes :bufwipeout on all HG command
    output buffers for the source buffer.
 
 :HGLog							              *:HGLog*
 
    Performs "hg log" on the current file.
 
    If an argument is given, it is passed as an argument to the "-r" option of
    "hg log".
 
 :HGRevert						           *:HGRevert*
 
    Replaces the current file with the most recent version from the repository
    in order to wipe out any undesired changes.
 
 :HGReview						           *:HGReview*
 
    Retrieves a particular version of the current file.  If no argument is
    given, the most recent version of the file on the current branch is
    retrieved.  Otherwise, the specified version is retrieved.
 
 :HGStatus					 	           *:HGStatus*
 
    Performs "hg status" on the current file.
 
 :HGUpdate						           *:HGUpdate*
 
    Performs "hg update" on the current file.  This intentionally does not
    automatically reload the current buffer, though vim should prompt the user
    to do so if the underlying file is altered by this command.
 
 :HGVimDiff						          *:HGVimDiff*
 
    With no arguments, this prompts the user for a revision and then uses
    vimdiff to display the differences between the current file and the
    specified revision.  If no revision is specified, the most recent version
    of the file on the current branch is used.
 
    With one argument, that argument is used as the revision as above.  With
    two arguments, the differences between the two revisions is displayed using
    vimdiff.
 
    With either zero or one argument, the original buffer is used to perform
    the vimdiff.  When the other buffer is closed, the original buffer will be
    returned to normal mode.
 
    Once vimdiff mode is started using the above methods, additional vimdiff
    buffers may be added by passing a single version argument to the command.
    There may be up to 4 vimdiff buffers total.
 
    Using the 2-argument form of the command resets the vimdiff to only those 2
    versions.  Additionally, invoking the command on a different file will
    close the previous vimdiff buffers.
 
 
 4.2 Mappings						  *hgcommand-mappings*
 
    By default, a mapping is defined for each command.  These mappings execute
    the default (no-argument) form of each command.
 
       <Leader>hga HGAdd
       <Leader>hgn HGAnnotate
       <Leader>hgc HGCommit
       <Leader>hgd HGDiff
       <Leader>hgg HGGotoOriginal
       <Leader>hgG HGGotoOriginal!
       <Leader>hgl HGLog
       <Leader>hgr HGReview
       <Leader>hgs HGStatus
       <Leader>hgu HGUpdate
       <Leader>hgv HGVimDiff
 
                                                  *hgcommand-mappings-override*
 
    The default mappings can be overridden by user-provided instead by mapping
    to <Plug>CommandName.  This is especially useful when these mappings
    collide with other existing mappings (vim will warn of this during plugin
    initialization, but will not clobber the existing mappings).
 
    For instance, to override the default mapping for :HGAdd to set it to
    '\add', add the following to the vimrc: >
 
       nmap \add <Plug>HGAdd
 <
 4.3 Automatic buffer variables			  *hgcommand-buffer-variables*
 
    Several buffer variables are defined in each HGCommand result buffer.
    These may be useful for additional customization in callbacks defined in
    the event handlers (please see |hgcommand-events|).
 
    The following variables are automatically defined:
 
 b:hgOrigBuffNR						      *b:hgOrigBuffNR*
 
    This variable is set to the buffer number of the source file.
 
 b:hgcmd						                     *b:hgcmd*
 
    This variable is set to the name of the hg command that created the result
    buffer.
 ==============================================================================
 
 5. Configuration and customization			 *hgcommand-customize*
                                                             *hgcommand-config*
 
    The HGCommand plugin can be configured in two ways:  by setting
    configuration variables (see |hgcommand-options|) or by defining HGCommand
    event handlers (see |hgcommand-events|).  Additionally, the HGCommand
    plugin provides several option for naming the HG result buffers (see
    |hgcommand-naming|) and supported a customized status line (see
    |hgcommand-statusline| and |hgcommand-buffer-management|).
 
 5.1 HGCommand configuration variables			   *hgcommand-options*
 
    Several variables affect the plugin's behavior.  These variables are
    checked at time of execution, and may be defined at the window, buffer, or
    global level and are checked in that order of precedence.
 
 
    The following variables are available:
 
       |HGCommandAnnotateParent|
       |HGCommandCommitOnWrite|
       |HGCommandHGExec|
       |HGCommandDeleteOnHide|
       |HGCommandDiffOpt|
       |HGCommandDiffSplit|
       |HGCommandEdit|
       |HGCommandEnableBufferSetup|
       |HGCommandInteractive|
       |HGCommandNameMarker|
       |HGCommandNameResultBuffers|
       |HGCommandSplit|
 
 HGCommandAnnotateParent			             *HGCommandAnnotateParent*
 
    This variable, if set to a non-zero value, causes the zero-argument form of
    HGAnnotate when invoked on a HGAnnotate buffer to go to the version
    previous to that displayed on the current line. If not set, it defaults to
    0.
 
 HGCommandCommitOnWrite				      *HGCommandCommitOnWrite*
 
    This variable, if set to a non-zero value, causes the pending hg commit to
    take place immediately as soon as the log message buffer is written.  If
    set to zero, only the HGCommit mapping will cause the pending commit to
    occur.  If not set, it defaults to 1.
 
 HGCommandHGExec				                     *HGCommandHGExec*
 
    This variable controls the executable used for all HG commands.  If not
    set, it defaults to "hg".
 
 HGCommandDeleteOnHide				       *HGCommandDeleteOnHide*
 
    This variable, if set to a non-zero value, causes the temporary HG result
    buffers to automatically delete themselves when hidden.
 
 HGCommandDiffOpt				            *HGCommandDiffOpt*
 
    This variable, if set, determines the options passed to the diff command of
    HG.  If not set, it defaults to 'w'.
 
 HGCommandDiffSplit				          *HGCommandDiffSplit*
 
    This variable overrides the |HGCommandSplit| variable, but only for buffers
    created with |:HGVimDiff|.
 
 HGCommandEdit					               *HGCommandEdit*
 
    This variable controls whether the original buffer is replaced ('edit') or
    split ('split').  If not set, it defaults to 'edit'.
 
 HGCommandEnableBufferSetup			  *HGCommandEnableBufferSetup*
 
    This variable, if set to a non-zero value, activates HG buffer management
    mode see (|hgcommand-buffer-management|).  This mode means that three
    buffer variables, 'HGRepository', 'HGRevision' and 'HGBranch', are set if
    the file is HG-controlled.  This is useful for displaying version
    information in the status bar.
 
 HGCommandInteractive				        *HGCommandInteractive*
 
    This variable, if set to a non-zero value, causes appropriate commands (for
    the moment, only |:HGReview|) to query the user for a revision to use
    instead of the current revision if none is specified.
 
 HGCommandNameMarker				         *HGCommandNameMarker*
 
    This variable, if set, configures the special attention-getting characters
    that appear on either side of the hg buffer type in the buffer name.  This
    has no effect unless |HGCommandNameResultBuffers| is set to a true value.
    If not set, it defaults to '_'.
 
 HGCommandNameResultBuffers			  *HGCommandNameResultBuffers*
 
    This variable, if set to a true value, causes the hg result buffers to be
    named in the old way ('<source file name> _<hg command>_').  If not set or
    set to a false value, the result buffer is nameless.
 
 HGCommandSplit					              *HGCommandSplit*
 
    This variable controls the orientation of the various window splits that
    may occur (such as with HGVimDiff, when using a HG command on a HG command
    buffer, or when the |HGCommandEdit| variable is set to 'split'.  If set to
    'horizontal', the resulting windows will be on stacked on top of one
    another.  If set to 'vertical', the resulting windows will be side-by-side.
    If not set, it defaults to 'horizontal' for all but HGVimDiff windows.
 
 5.2 HGCommand events				            *hgcommand-events*
 
    For additional customization, HGCommand can trigger user-defined events.
    Event handlers are provided by defining User event autocommands (see
    |autocommand|, |User|) in the HGCommand group with patterns matching the
    event name.
 
    For instance, the following could be added to the vimrc to provide a 'q'
    mapping to quit a HGCommand scratch buffer: >
 
       augroup HGCommand
          au HGCommand User HGBufferCreated silent! nmap <unique> <buffer> q:
          bwipeout<cr>
       augroup END
 <
 
    The following hooks are available:
 
 HGBufferCreated		This event is fired just after a hg command result
                         buffer is created and filled with the result of a hg
                         command.  It is executed within the context of the HG
                         command buffer.  The HGCommand buffer variables may be
                         useful for handlers of this event (please see
                         |hgcommand-buffer-variables|).
 
 HGBufferSetup		This event is fired just after HG buffer setup occurs,
                         if enabled.
 
 HGPluginInit		This event is fired when the HGCommand plugin first
                         loads.
 
 HGPluginFinish		This event is fired just after the HGCommand plugin
                         loads.
 
 HGVimDiffFinish		This event is fired just after the HGVimDiff command
                         executes to allow customization of, for instance,
                         window placement and focus.
 
 5.3 HGCommand buffer naming				    *hgcommand-naming*
 
    By default, the buffers containing the result of HG commands are nameless
    scratch buffers.  It is intended that buffer variables of those buffers be
    used to customize the statusline option so that the user may fully control
    the display of result buffers.
 
    If the old-style naming is desired, please enable the
    |HGCommandNameResultBuffers| variable.  Then, each result buffer will
    receive a unique name that includes the source file name, the HG command,
    and any extra data (such as revision numbers) that were part of the
    command.
 
 5.4 HGCommand status line support			*hgcommand-statusline*
 
    It is intended that the user will customize the |'statusline'| option to
    include HG result buffer attributes.  A sample function that may be used in
    the |'statusline'| option is provided by the plugin, HGGetStatusLine().  In
    order to use that function in the status line, do something like the
    following: >
 
       set statusline=%<%f\ %{HGGetStatusLine()}\ %h%m%r%=%l,%c%V\ %P
 <
    of which %{HGGetStatusLine()} is the relevant portion.
 
    The sample HGGetStatusLine() function handles both HG result buffers and
    HG-managed files if HGCommand buffer management is enabled (please see
    |hgcommand-buffer-management|).
 
 5.5 HGCommand buffer management		         *hgcommand-buffer-management*
 
    The HGCommand plugin can operate in buffer management mode, which means
    that it attempts to set two buffer variables ('HGRevision' and 'HGBranch')
    upon entry into a buffer.  This is rather slow because it means that 'hg
    status' will be invoked at each entry into a buffer (during the |BufEnter|
    autocommand).
 
    This mode is enabled by default.  In order to disable it, set the
    |HGCommandEnableBufferSetup| variable to a false (zero) value.  Enabling
    this mode simply provides the buffer variables mentioned above.  The user
    must explicitly include those in the |'statusline'| option if they are to
    appear in the status line (but see |hgcommand-statusline| for a simple way
    to do that).
 
 ==============================================================================
 9. Tips							      *hgcommand-tips*
 
 9.1 Split window annotation, by Michael Anderson >
 
    :nmap <Leader>hgN :vs<CR><C-w>h<Leader>hgn:vertical res 40<CR>
                  \ggdddd:set scb<CR>:set nowrap<CR><C-w>lgg:set scb<CR>
                  \:set nowrap<CR>
 <
 
    This splits the buffer vertically, puts an annotation on the left (minus
    the header) with the width set to 40. An editable/normal copy is placed on
    the right.  The two versions are scroll locked so they  move as one. and
    wrapping is turned off so that the lines line up correctly. The advantages
    are...
 
    1) You get a versioning on the right.
    2) You can still edit your own code.
    3) Your own code still has syntax highlighting.
 
 ==============================================================================
 
 8. Known bugs						      *hgcommand-bugs*
 
    Please let me know if you run across any.
 
    HGVimDiff, when using the original (real) source buffer as one of the diff
    buffers, uses some hacks to try to restore the state of the original buffer
    when the scratch buffer containing the other version is destroyed.  There
    may still be bugs in here, depending on many configuration details.
 
 ==============================================================================
 
 9. TODO  						      *hgcommand-todo*
 
    Integrate symlink tracking once HG will support them.
 ==============================================================================
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