" 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 <[email protected]>
" License:       This file is placed in the public domain.
" Credits:
"                Bob Hiestand <[email protected]> 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 syntaxic 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, ' ')
 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, ' ')
 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 existance 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 <[email protected]>
Credits:  Bob Hiestand <[email protected]>
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 overriden 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.
==============================================================================
=== END_DOC
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