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+" vim600: set foldmethod=marker:
+"
+" Vim plugin to assist in working with files under control of various Version
+" Control Systems, such as CVS, SVN, SVK, and git.
+"
+" Maintainer:    Bob Hiestand <bob.hiestand@gmail.com>
+" License:
+" Copyright (c) Bob Hiestand
+"
+" Permission is hereby granted, free of charge, to any person obtaining a copy
+" of this software and associated documentation files (the "Software"), to
+" deal in the Software without restriction, including without limitation the
+" rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+" sell copies of the Software, and to permit persons to whom the Software is
+" furnished to do so, subject to the following conditions:
+"
+" The above copyright notice and this permission notice shall be included in
+" all copies or substantial portions of the Software.
+"
+" THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+" IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+" FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+" AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+" LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+" FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+" IN THE SOFTWARE.
+"
+" Section: Documentation {{{1
+"
+" Provides functions to invoke various source control commands on the current
+" file (either the current buffer, or, in the case of an directory buffer, the
+" directory and all subdirectories associated with the current buffer).  The
+" output of the commands is captured in a new scratch window.
+"
+" This plugin needs additional extension plugins, each specific to a source
+" control system, to function.  Several options include the name of the
+" version control system in the option name.  Such options use the placeholder
+" text '{VCSType}', which would be replaced in actual usage with 'CVS' or
+" 'SVN', for instance.
+"
+" Command documentation {{{2
+"
+" VCSAdd           Adds the current file to source control.
+"
+" VCSAnnotate[!]   Displays the current file with each line annotated with the
+"                  version in which it was most recently changed.  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 VCSAnnotate buffer
+"                  already, the version number on the current line is used.
+"
+"                  If '!' is used, the view of the annotated buffer is split
+"                  so that the annotation is in a separate window from the
+"                  content, and each is highlighted separately.
+"
+" VCSBlame         Alias for 'VCSAnnotate'.
+"
+" VCSCommit[!]     Commits changes to the current file to source control.
+"
+"                  If called with arguments, the arguments are the log message.
+"
+"                  If '!' is used, 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.
+"
+" VCSDelete        Deletes the current file and removes it from source control.
+"
+" VCSDiff          With no arguments, this displays the differences between
+"                  the current file and its parent version under source
+"                  control in a new scratch buffer.
+"
+"                  With one argument, the diff is performed on the
+"                  current file against the specified revision.
+"
+"                  With two arguments, the diff is performed between the
+"                  specified revisions of the current file.
+"
+"                  This command uses the 'VCSCommand{VCSType}DiffOpt' variable
+"                  to specify diff options.  If that variable does not exist,
+"                  a plugin-specific default is used.  If you wish to have no
+"                  options, then set it to the empty string.
+"
+" VCSGotoOriginal  Jumps to the source buffer if the current buffer is a VCS
+"                  scratch buffer.  If VCSGotoOriginal[!] is used, remove all
+"                  VCS scratch buffers associated with the original file.
+"
+" VCSInfo          Displays extended information about the current file in a
+"                  new scratch buffer.
+"
+" VCSLock          Locks the current file in order to prevent other users from
+"                  concurrently modifying it.  The exact semantics of this
+"                  command depend on the underlying VCS.
+"
+" VCSLog           Displays the version history of the current file in a new
+"                  scratch buffer.
+"
+" VCSRemove        Alias for 'VCSDelete'.
+"
+" VCSRevert        Replaces the modified version of the current file with the
+"                  most recent version from the repository.
+"
+" VCSReview        Displays a particular version of the current file in a new
+"                  scratch buffer.  If no argument is given, the most recent
+"                  version of the file on the current branch is retrieved.
+"
+" VCSStatus        Displays versioning information about the current file in a
+"                  new scratch buffer.
+"
+" VCSUnlock        Unlocks the current file in order to allow other users from
+"                  concurrently modifying it.  The exact semantics of this
+"                  command depend on the underlying VCS.
+"
+" VCSUpdate        Updates the current file with any relevant changes from the
+"                  repository.
+"
+" VCSVimDiff       Uses vimdiff to display differences between versions of the
+"                  current file.
+"
+"                  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 scratch 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.
+"
+" Mapping documentation: {{{2
+"
+" By default, a mapping is defined for each command.  User-provided mappings
+" can be used instead by mapping to <Plug>CommandName, for instance:
+"
+" nmap ,ca <Plug>VCSAdd
+"
+" The default mappings are as follow:
+"
+"   <Leader>ca VCSAdd
+"   <Leader>cn VCSAnnotate
+"   <Leader>cN VCSAnnotate!
+"   <Leader>cc VCSCommit
+"   <Leader>cD VCSDelete
+"   <Leader>cd VCSDiff
+"   <Leader>cg VCSGotoOriginal
+"   <Leader>cG VCSGotoOriginal!
+"   <Leader>ci VCSInfo
+"   <Leader>cl VCSLog
+"   <Leader>cL VCSLock
+"   <Leader>cr VCSReview
+"   <Leader>cs VCSStatus
+"   <Leader>cu VCSUpdate
+"   <Leader>cU VCSUnlock
+"   <Leader>cv VCSVimDiff
+"
+" Options documentation: {{{2
+"
+" Several variables are checked by the script to determine behavior as follow:
+"
+" VCSCommandCommitOnWrite
+"   This variable, if set to a non-zero value, causes the pending commit to
+"   take place immediately as soon as the log message buffer is written.  If
+"   set to zero, only the VCSCommit mapping will cause the pending commit to
+"   occur.  If not set, it defaults to 1.
+"
+" VCSCommandDeleteOnHide
+"   This variable, if set to a non-zero value, causes the temporary VCS result
+"   buffers to automatically delete themselves when hidden.
+"
+" VCSCommand{VCSType}DiffOpt
+"   This variable, if set, determines the options passed to the diff command
+"   of the underlying VCS.  Each VCS plugin defines a default value.
+"
+" VCSCommandDiffSplit
+"   This variable overrides the VCSCommandSplit variable, but only for buffers
+"   created with VCSVimDiff.
+"
+" VCSCommandDisableAll
+"   This variable, if set, prevents the plugin or any extensions from loading
+"   at all.  This is useful when a single runtime distribution is used on
+"   multiple systems with varying versions.
+"
+" VCSCommandDisableMappings
+"   This variable, if set to a non-zero value, prevents the default command
+"   mappings from being set.
+"
+" VCSCommandDisableExtensionMappings
+"   This variable, if set to a non-zero value, prevents the default command
+"   mappings from being set for commands specific to an individual VCS.
+"
+" VCSCommandDisableMenu
+"   This variable, if set to a non-zero value, prevents the default command
+"   menu from being set.
+"
+" VCSCommandEdit
+"   This variable controls whether to split the current window to display a
+"   scratch buffer ('split'), or to display it in the current buffer ('edit').
+"   If not set, it defaults to 'split'.
+"
+" VCSCommandEnableBufferSetup
+"   This variable, if set to a non-zero value, activates VCS buffer management
+"   mode.  This mode means that the buffer variable 'VCSRevision' is set if
+"   the file is VCS-controlled.  This is useful for displaying version
+"   information in the status bar.  Additional options may be set by
+"   individual VCS plugins.
+"
+" VCSCommandMappings
+"   This variable, if set, overrides the default mappings used for shortcuts.
+"   It should be a List of 2-element Lists, each containing a shortcut and
+"   function name pair.
+"
+" VCSCommandMapPrefix
+"   This variable, if set, overrides the default mapping prefix ('<Leader>c').
+"   This allows customization of the mapping space used by the vcscommand
+"   shortcuts.
+"
+" VCSCommandMenuPriority
+"   This variable, if set, overrides the default menu priority '' (empty)
+"
+" VCSCommandMenuRoot
+"   This variable, if set, overrides the default menu root 'Plugin.VCS'
+"
+" VCSCommandResultBufferNameExtension
+"   This variable, if set to a non-blank value, is appended to the name of the
+"   VCS command output buffers.  For example, '.vcs'.  Using this option may
+"   help avoid problems caused by autocommands dependent on file extension.
+"
+" VCSCommandResultBufferNameFunction
+"   This variable, if set, specifies a custom function for naming VCS command
+"   output buffers.  This function will be passed the following arguments:
+"
+"   command - name of the VCS command being executed (such as 'Log' or
+"   'Diff').
+"
+"   originalBuffer - buffer number of the source file.
+"
+"   vcsType - type of VCS controlling this file (such as 'CVS' or 'SVN').
+"
+"   statusText - extra text associated with the VCS action (such as version
+"   numbers).
+"
+" VCSCommandSplit
+"   This variable controls the orientation of the various window splits that
+"   may occur (such as with VCSVimDiff, when using a VCS command on a VCS
+"   command buffer, or when the 'VCSCommandEdit' 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
+"   VCSVimDiff windows.
+"
+" VCSCommandVCSTypeOverride
+"   This variable allows the VCS type detection to be overridden on a
+"   path-by-path basis.  The value of this variable is expected to be a List
+"   of Lists.  Each high-level List item is a List containing two elements.
+"   The first element is a regular expression that will be matched against the
+"   full file name of a given buffer.  If it matches, the second element will
+"   be used as the VCS type.
+"
+" Event documentation {{{2
+"   For additional customization, VCSCommand.vim uses User event autocommand
+"   hooks.  Each event is in the VCSCommand group, and different patterns
+"   match the various hooks.
+"
+"   For instance, the following could be added to the vimrc to provide a 'q'
+"   mapping to quit a VCS scratch buffer:
+"
+"   augroup VCSCommand
+"     au VCSCommand User VCSBufferCreated silent! nmap <unique> <buffer> q :bwipeout<cr>
+"   augroup END
+"
+"   The following hooks are available:
+"
+"   VCSBufferCreated           This event is fired just after a VCS command
+"                              output buffer is created.  It is executed
+"                              within the context of the new buffer.
+"
+"   VCSBufferSetup             This event is fired just after VCS buffer setup
+"                              occurs, if enabled.
+"
+"   VCSPluginInit              This event is fired when the VCSCommand plugin
+"                              first loads.
+"
+"   VCSPluginFinish            This event is fired just after the VCSCommand
+"                              plugin loads.
+"
+"   VCSVimDiffFinish           This event is fired just after the VCSVimDiff
+"                              command executes to allow customization of,
+"                              for instance, window placement and focus.
+"
+" Section: Plugin header {{{1
+
+" loaded_VCSCommand 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('VCSCommandDisableAll')
+	finish
+endif
+
+if exists('loaded_VCSCommand')
+	finish
+endif
+let loaded_VCSCommand = 1
+
+if v:version < 700
+	echohl WarningMsg|echomsg 'VCSCommand requires at least VIM 7.0'|echohl None
+	finish
+endif
+
+let s:save_cpo=&cpo
+set cpo&vim
+
+" Section: Event group setup {{{1
+
+augroup VCSCommand
+augroup END
+
+augroup VCSCommandCommit
+augroup END
+
+" Section: Plugin initialization {{{1
+silent do VCSCommand User VCSPluginInit
+
+" Section: Constants declaration {{{1
+
+let g:VCSCOMMAND_IDENTIFY_EXACT = 1
+let g:VCSCOMMAND_IDENTIFY_INEXACT = -1
+
+" Section: Script variable initialization {{{1
+
+" Hidden functions for use by extensions
+let s:VCSCommandUtility = {}
+
+" plugin-specific information:  {vcs -> [script, {command -> function}, {key -> mapping}]}
+let s:plugins = {}
+
+" temporary values of overridden configuration variables
+let s:optionOverrides = {}
+
+" state flag used to vary behavior of certain automated actions
+let s:isEditFileRunning = 0
+
+" Section: Utility functions {{{1
+
+" Function: s:ReportError(mapping) {{{2
+" Displays the given error in a consistent faction.  This is intended to be
+" invoked from a catch statement.
+
+function! s:ReportError(error)
+	echohl WarningMsg|echomsg 'VCSCommand:  ' . a:error|echohl None
+endfunction
+
+" Function: s:VCSCommandUtility.system(...) {{{2
+" Replacement for system() function.  This version protects the quoting in the
+" command line on Windows systems.
+
+function! s:VCSCommandUtility.system(...)
+	if (has("win32") || has("win64")) && &sxq !~ '"'
+		let save_sxq = &sxq
+		set sxq=\"
+	endif
+	try
+		return call('system', a:000)
+	finally
+		if exists("save_sxq")
+			let &sxq = save_sxq
+		endif
+	endtry
+endfunction
+
+" Function: s:VCSCommandUtility.addMenuItem(shortcut, command) {{{2
+" Adds the given menu item.
+
+function! s:VCSCommandUtility.addMenuItem(shortcut, command)
+	if s:menuEnabled
+	    exe 'amenu <silent> '.s:menuPriority.' '.s:menuRoot.'.'.a:shortcut.' '.a:command
+	endif
+endfunction
+
+" Function: s:ClearMenu() {{{2
+" Removes all VCSCommand menu items
+function! s:ClearMenu()
+	if s:menuEnabled
+		execute 'aunmenu' s:menuRoot
+	endif
+endfunction
+
+" Function: s:CreateMapping(shortcut, expansion, display) {{{2
+" Creates the given mapping by prepending the contents of
+" 'VCSCommandMapPrefix' (by default '<Leader>c') to the given shortcut and
+" mapping it to the given plugin function.  If a mapping exists for the
+" specified shortcut + prefix, emit an error but continue.  If a mapping
+" exists for the specified function, do nothing.
+
+function! s:CreateMapping(shortcut, expansion, display)
+	let lhs = VCSCommandGetOption('VCSCommandMapPrefix', '<Leader>c') . a:shortcut
+	if !hasmapto(a:expansion)
+		try
+			execute 'nmap <silent> <unique>' lhs a:expansion
+		catch /^Vim(.*):E227:/
+			if(&verbose != 0)
+				echohl WarningMsg|echomsg 'VCSCommand:  mapping ''' . lhs . ''' already exists, refusing to overwrite.  The mapping for ' . a:display . ' will not be available.'|echohl None
+			endif
+		endtry
+	endif
+endfunction
+
+" Function: s:ExecuteExtensionMapping(mapping) {{{2
+" Invokes the appropriate extension mapping depending on the type of the
+" current buffer.
+
+function! s:ExecuteExtensionMapping(mapping)
+	let buffer = bufnr('%')
+	let vcsType = VCSCommandGetVCSType(buffer)
+	if !has_key(s:plugins, vcsType)
+		throw 'Unknown VCS type:  ' . vcsType
+	endif
+	if !has_key(s:plugins[vcsType][2], a:mapping)
+		throw 'This extended mapping is not defined for ' . vcsType
+	endif
+	silent execute 'normal' ':' .  s:plugins[vcsType][2][a:mapping] . "\<CR>"
+endfunction
+
+" Function: s:ExecuteVCSCommand(command, argList) {{{2
+" Calls the indicated plugin-specific VCS command on the current buffer.
+" Returns: buffer number of resulting output scratch buffer, or -1 if an error
+" occurs.
+
+function! s:ExecuteVCSCommand(command, argList)
+	try
+		let buffer = bufnr('%')
+
+		let vcsType = VCSCommandGetVCSType(buffer)
+		if !has_key(s:plugins, vcsType)
+			throw 'Unknown VCS type:  ' . vcsType
+		endif
+
+		let originalBuffer = VCSCommandGetOriginalBuffer(buffer)
+		let bufferName = bufname(originalBuffer)
+
+		" It is already known that the directory is under VCS control.  No further
+		" checks are needed.  Otherwise, perform some basic sanity checks to avoid
+		" VCS-specific error messages from confusing things.
+		if !isdirectory(bufferName)
+			if !filereadable(bufferName)
+				throw 'No such file ' . bufferName
+			endif
+		endif
+
+		let functionMap = s:plugins[vcsType][1]
+		if !has_key(functionMap, a:command)
+			throw 'Command ''' . a:command . ''' not implemented for ' . vcsType
+		endif
+		return functionMap[a:command](a:argList)
+	catch
+		call s:ReportError(v:exception)
+		return -1
+	endtry
+endfunction
+
+" Function: s:GenerateResultBufferName(command, originalBuffer, vcsType, statusText) {{{2
+" Default method of generating the name for VCS result buffers.  This can be
+" overridden with the VCSResultBufferNameFunction variable.
+
+function! s:GenerateResultBufferName(command, originalBuffer, vcsType, statusText)
+	let fileName = bufname(a:originalBuffer)
+	let bufferName = a:vcsType . ' ' . a:command
+	if strlen(a:statusText) > 0
+		let bufferName .= ' ' . a:statusText
+	endif
+	let bufferName .= ' ' . fileName
+	let counter = 0
+	let versionedBufferName = bufferName
+	while bufexists(versionedBufferName)
+		let counter += 1
+		let versionedBufferName = bufferName . ' (' . counter . ')'
+	endwhile
+	return versionedBufferName
+endfunction
+
+" Function: s:GenerateResultBufferNameWithExtension(command, originalBuffer, vcsType, statusText) {{{2
+" Method of generating the name for VCS result buffers that uses the original
+" file name with the VCS type and command appended as extensions.
+
+function! s:GenerateResultBufferNameWithExtension(command, originalBuffer, vcsType, statusText)
+	let fileName = bufname(a:originalBuffer)
+	let bufferName = a:vcsType . ' ' . a:command
+	if strlen(a:statusText) > 0
+		let bufferName .= ' ' . a:statusText
+	endif
+	let bufferName .= ' ' . fileName . VCSCommandGetOption('VCSCommandResultBufferNameExtension', '.vcs')
+	let counter = 0
+	let versionedBufferName = bufferName
+	while bufexists(versionedBufferName)
+		let counter += 1
+		let versionedBufferName = '(' . counter . ') ' . bufferName
+	endwhile
+	return versionedBufferName
+endfunction
+
+" Function: s:EditFile(command, originalBuffer, statusText) {{{2
+" Creates a new buffer of the given name and associates it with the given
+" original buffer.
+
+function! s:EditFile(command, originalBuffer, statusText)
+	let vcsType = getbufvar(a:originalBuffer, 'VCSCommandVCSType')
+
+	" Protect against useless buffer set-up
+	let s:isEditFileRunning += 1
+	try
+		let editCommand = VCSCommandGetOption('VCSCommandEdit', 'split')
+		if editCommand == 'split'
+			if VCSCommandGetOption('VCSCommandSplit', 'horizontal') == 'horizontal'
+				rightbelow split
+			else
+				vert rightbelow split
+			endif
+		endif
+
+		enew
+
+		call s:SetupScratchBuffer(a:command, vcsType, a:originalBuffer, a:statusText)
+
+	finally
+		let s:isEditFileRunning -= 1
+	endtry
+endfunction
+
+" Function: s:SetupScratchBuffer(command, vcsType, originalBuffer, statusText) {{{2
+" Creates convenience buffer variables and the name of a vcscommand result
+" buffer.
+
+function! s:SetupScratchBuffer(command, vcsType, originalBuffer, statusText)
+	let nameExtension = VCSCommandGetOption('VCSCommandResultBufferNameExtension', '')
+	if nameExtension == ''
+		let nameFunction = VCSCommandGetOption('VCSCommandResultBufferNameFunction', 's:GenerateResultBufferName')
+	else
+		let nameFunction = VCSCommandGetOption('VCSCommandResultBufferNameFunction', 's:GenerateResultBufferNameWithExtension')
+	endif
+
+	let name = call(nameFunction, [a:command, a:originalBuffer, a:vcsType, a:statusText])
+
+	let b:VCSCommandCommand = a:command
+	let b:VCSCommandOriginalBuffer = a:originalBuffer
+	let b:VCSCommandSourceFile = bufname(a:originalBuffer)
+	let b:VCSCommandVCSType = a:vcsType
+	if a:statusText != ''
+		let b:VCSCommandStatusText = a:statusText
+	endif
+
+	setlocal buftype=nofile
+	setlocal noswapfile
+	let &filetype = tolower(a:vcsType . a:command)
+
+	if VCSCommandGetOption('VCSCommandDeleteOnHide', 0)
+		setlocal bufhidden=delete
+	endif
+	silent noautocmd file `=name`
+endfunction
+
+" Function: s:SetupBuffer() {{{2
+" Attempts to set the b:VCSCommandBufferInfo variable
+
+function! s:SetupBuffer()
+	if (exists('b:VCSCommandBufferSetup') && b:VCSCommandBufferSetup)
+		" This buffer is already set up.
+		return
+	endif
+
+	if !isdirectory(@%) && (strlen(&buftype) > 0 || !filereadable(@%))
+		" No special status for special buffers other than directory buffers.
+		return
+	endif
+
+	if !VCSCommandGetOption('VCSCommandEnableBufferSetup', 0) || s:isEditFileRunning > 0
+		unlet! b:VCSCommandBufferSetup
+		return
+	endif
+
+	try
+		let vcsType = VCSCommandGetVCSType(bufnr('%'))
+		let b:VCSCommandBufferInfo = s:plugins[vcsType][1].GetBufferInfo()
+		silent do VCSCommand User VCSBufferSetup
+	catch /No suitable plugin/
+		" This is not a VCS-controlled file.
+		let b:VCSCommandBufferInfo = []
+	endtry
+
+	let b:VCSCommandBufferSetup = 1
+endfunction
+
+" Function: s:MarkOrigBufferForSetup(buffer) {{{2
+" Resets the buffer setup state of the original buffer for a given VCS scratch
+" buffer.
+" Returns:  The VCS buffer number in a passthrough mode.
+
+function! s:MarkOrigBufferForSetup(buffer)
+	checktime
+	if a:buffer > 0
+		let origBuffer = VCSCommandGetOriginalBuffer(a:buffer)
+		" This should never not work, but I'm paranoid
+		if origBuffer != a:buffer
+			call setbufvar(origBuffer, 'VCSCommandBufferSetup', 0)
+		endif
+	endif
+	return a:buffer
+endfunction
+
+" Function: s:OverrideOption(option, [value]) {{{2
+" Provides a temporary override for the given VCS option.  If no value is
+" passed, the override is disabled.
+
+function! s:OverrideOption(option, ...)
+	if a:0 == 0
+		call remove(s:optionOverrides[a:option], -1)
+	else
+		if !has_key(s:optionOverrides, a:option)
+			let s:optionOverrides[a:option] = []
+		endif
+		call add(s:optionOverrides[a:option], a:1)
+	endif
+endfunction
+
+" Function: s:WipeoutCommandBuffers() {{{2
+" Clears all current VCS output buffers of the specified type for a given source.
+
+function! s:WipeoutCommandBuffers(originalBuffer, VCSCommand)
+	let buffer = 1
+	while buffer <= bufnr('$')
+		if getbufvar(buffer, 'VCSCommandOriginalBuffer') == a:originalBuffer
+			if getbufvar(buffer, 'VCSCommandCommand') == a:VCSCommand
+				execute 'bw' buffer
+			endif
+		endif
+		let buffer = buffer + 1
+	endwhile
+endfunction
+
+" Function: s:VimDiffRestore(vimDiffBuff) {{{2
+" Checks whether the given buffer is one whose deletion should trigger
+" restoration of an original buffer after it was diffed.  If so, it executes
+" the appropriate setting command stored with that original buffer.
+
+function! s:VimDiffRestore(vimDiffBuff)
+	let s:isEditFileRunning += 1
+	try
+		if exists('t:vcsCommandVimDiffSourceBuffer')
+			if a:vimDiffBuff == t:vcsCommandVimDiffSourceBuffer
+				" Original file is being removed.
+				unlet! t:vcsCommandVimDiffSourceBuffer
+				unlet! t:vcsCommandVimDiffRestoreCmd
+				unlet! t:vcsCommandVimDiffScratchList
+			else
+				let index = index(t:vcsCommandVimDiffScratchList, a:vimDiffBuff)
+				if index >= 0
+					call remove(t:vcsCommandVimDiffScratchList, index)
+					if len(t:vcsCommandVimDiffScratchList) == 0
+						if exists('t:vcsCommandVimDiffRestoreCmd')
+							" All scratch buffers are gone, reset the original.
+							" Only restore if the source buffer is still in Diff mode
+
+							let sourceWinNR = bufwinnr(t:vcsCommandVimDiffSourceBuffer)
+							if sourceWinNR != -1
+								" The buffer is visible in at least one window
+								let currentWinNR = winnr()
+								while winbufnr(sourceWinNR) != -1
+									if winbufnr(sourceWinNR) == t:vcsCommandVimDiffSourceBuffer
+										execute sourceWinNR . 'wincmd w'
+										if getwinvar(0, '&diff')
+											execute t:vcsCommandVimDiffRestoreCmd
+										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' t:vcsCommandVimDiffSourceBuffer
+								if getwinvar(0, '&diff')
+									execute t:vcsCommandVimDiffRestoreCmd
+								endif
+								execute 'hide buffer' currentBufNR
+							endif
+
+							unlet t:vcsCommandVimDiffRestoreCmd
+						endif
+						" All buffers are gone.
+						unlet t:vcsCommandVimDiffSourceBuffer
+						unlet t:vcsCommandVimDiffScratchList
+					endif
+				endif
+			endif
+		endif
+	finally
+		let s:isEditFileRunning -= 1
+	endtry
+endfunction
+
+" Section: Generic VCS command functions {{{1
+
+" Function: s:VCSAnnotate(...) {{{2
+function! s:VCSAnnotate(bang, ...)
+	try
+		let line = line('.')
+		let currentBuffer = bufnr('%')
+		let originalBuffer = VCSCommandGetOriginalBuffer(currentBuffer)
+
+		let annotateBuffer = s:ExecuteVCSCommand('Annotate', a:000)
+		if annotateBuffer == -1
+			return -1
+		endif
+		if a:bang == '!' && VCSCommandGetOption('VCSCommandDisableSplitAnnotate', 0) == 0
+			let vcsType = VCSCommandGetVCSType(annotateBuffer)
+			let functionMap = s:plugins[vcsType][1]
+			let splitRegex = ''
+			if has_key(s:plugins[vcsType][1], 'AnnotateSplitRegex')
+				let splitRegex = s:plugins[vcsType][1]['AnnotateSplitRegex']
+			endif
+			let splitRegex = VCSCommandGetOption('VCSCommand' . vcsType . 'AnnotateSplitRegex', splitRegex)
+			if splitRegex == ''
+				return annotateBuffer
+			endif
+			let originalFileType = getbufvar(originalBuffer, '&ft')
+			let annotateFileType = getbufvar(annotateBuffer, '&ft')
+			execute "normal 0zR\<c-v>G/" . splitRegex . "/e\<cr>d"
+			call setbufvar('%', '&filetype', getbufvar(originalBuffer, '&filetype'))
+			set scrollbind
+			leftabove vert new
+			normal 0P
+			execute "normal" . col('$') . "\<c-w>|"
+			call s:SetupScratchBuffer('annotate', vcsType, originalBuffer, 'header')
+			wincmd l
+		endif
+
+		if currentBuffer == originalBuffer
+			" Starting from the original source buffer, so the
+			" current line is relevant.
+			if a:0 == 0
+				" No argument list means that we're annotating
+				" the current version, so jumping to the same
+				" line is the expected action.
+				execute "normal" line . 'G'
+				if has('folding')
+					" The execution of the buffer created autocommand
+					" re-folds the buffer.  Display the current line
+					" unfolded.
+					normal zv
+				endif
+			endif
+		endif
+
+		return annotateBuffer
+	catch
+		call s:ReportError(v:exception)
+		return -1
+	endtry
+endfunction
+
+" Function: s:VCSCommit() {{{2
+function! s:VCSCommit(bang, message)
+	try
+		let vcsType = VCSCommandGetVCSType(bufnr('%'))
+		if !has_key(s:plugins, vcsType)
+			throw 'Unknown VCS type:  ' . vcsType
+		endif
+
+		let originalBuffer = VCSCommandGetOriginalBuffer(bufnr('%'))
+
+		" 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 strlen(a:message) > 0 || a:bang == '!'
+			return s:VCSFinishCommit([a:message], originalBuffer)
+		endif
+
+		call s:EditFile('commitlog', originalBuffer, '')
+		setlocal ft=vcscommit
+
+		" Create a commit mapping.
+
+		nnoremap <silent> <buffer> <Plug>VCSCommit :call <SID>VCSFinishCommitWithBuffer()<CR>
+
+		silent 0put ='VCS: ----------------------------------------------------------------------'
+		silent put ='VCS: Please enter log message.  Lines beginning with ''VCS:'' are removed automatically.'
+		silent put ='VCS: To finish the commit, Type <leader>cc (or your own <Plug>VCSCommit mapping)'
+
+		if VCSCommandGetOption('VCSCommandCommitOnWrite', 1) == 1
+			setlocal buftype=acwrite
+			au VCSCommandCommit BufWriteCmd <buffer> call s:VCSFinishCommitWithBuffer()
+			silent put ='VCS: or write this buffer'
+		endif
+
+		silent put ='VCS: ----------------------------------------------------------------------'
+		$
+		setlocal nomodified
+		silent do VCSCommand User VCSBufferCreated
+	catch
+		call s:ReportError(v:exception)
+		return -1
+	endtry
+endfunction
+
+" Function: s:VCSFinishCommitWithBuffer() {{{2
+" Wrapper for s:VCSFinishCommit which is called only from a commit log buffer
+" which removes all lines starting with 'VCS:'.
+
+function! s:VCSFinishCommitWithBuffer()
+	setlocal nomodified
+	let currentBuffer = bufnr('%')
+	let logMessageList = getbufline('%', 1, '$')
+	call filter(logMessageList, 'v:val !~ ''^\s*VCS:''')
+	let resultBuffer = s:VCSFinishCommit(logMessageList, b:VCSCommandOriginalBuffer)
+	if resultBuffer >= 0
+		execute 'bw' currentBuffer
+	endif
+	return resultBuffer
+endfunction
+
+" Function: s:VCSFinishCommit(logMessageList, originalBuffer) {{{2
+function! s:VCSFinishCommit(logMessageList, originalBuffer)
+	let messageFileName = tempname()
+	call writefile(a:logMessageList, messageFileName)
+	try
+		let resultBuffer = s:ExecuteVCSCommand('Commit', [messageFileName])
+		if resultBuffer < 0
+			return resultBuffer
+		endif
+		return s:MarkOrigBufferForSetup(resultBuffer)
+	finally
+		call delete(messageFileName)
+	endtry
+endfunction
+
+" Function: s:VCSGotoOriginal(bang) {{{2
+function! s:VCSGotoOriginal(bang)
+	let originalBuffer = VCSCommandGetOriginalBuffer(bufnr('%'))
+	if originalBuffer > 0
+		let origWinNR = bufwinnr(originalBuffer)
+		if origWinNR == -1
+			execute 'buffer' originalBuffer
+		else
+			execute origWinNR . 'wincmd w'
+		endif
+		if a:bang == '!'
+			let buffnr = 1
+			let buffmaxnr = bufnr('$')
+			while buffnr <= buffmaxnr
+				if getbufvar(buffnr, 'VCSCommandOriginalBuffer') == originalBuffer
+					execute 'bw' buffnr
+				endif
+				let buffnr = buffnr + 1
+			endwhile
+		endif
+	endif
+endfunction
+
+function! s:VCSDiff(...)  "{{{2
+	let resultBuffer = s:ExecuteVCSCommand('Diff', a:000)
+	if resultBuffer > 0
+		let &filetype = 'diff'
+	elseif resultBuffer == 0
+		echomsg 'No differences found'
+	endif
+	return resultBuffer
+endfunction
+
+function! s:VCSReview(...)  "{{{2
+	let resultBuffer = s:ExecuteVCSCommand('Review', a:000)
+	if resultBuffer > 0
+		let &filetype = getbufvar(b:VCSCommandOriginalBuffer, '&filetype')
+	endif
+	return resultBuffer
+endfunction
+
+" Function: s:VCSVimDiff(...) {{{2
+function! s:VCSVimDiff(...)
+	try
+		let vcsType = VCSCommandGetVCSType(bufnr('%'))
+		if !has_key(s:plugins, vcsType)
+			throw 'Unknown VCS type:  ' . vcsType
+		endif
+		let originalBuffer = VCSCommandGetOriginalBuffer(bufnr('%'))
+		let s:isEditFileRunning = s:isEditFileRunning + 1
+		try
+			" If there's already a VimDiff'ed window, restore it.
+			" There may only be one VCSVimDiff original window at a time.
+
+			if exists('t:vcsCommandVimDiffSourceBuffer') && t:vcsCommandVimDiffSourceBuffer != originalBuffer
+				" Clear the existing vimdiff setup by removing the result buffers.
+				call s:WipeoutCommandBuffers(t:vcsCommandVimDiffSourceBuffer, 'vimdiff')
+			endif
+
+			let orientation = &diffopt =~ 'horizontal' ? 'horizontal' : 'vertical'
+			let orientation = VCSCommandGetOption('VCSCommandSplit', orientation)
+			let orientation = VCSCommandGetOption('VCSCommandDiffSplit', orientation)
+
+			" Split and diff
+			if(a:0 == 2)
+				" Reset the vimdiff system, as 2 explicit versions were provided.
+				if exists('t:vcsCommandVimDiffSourceBuffer')
+					call s:WipeoutCommandBuffers(t:vcsCommandVimDiffSourceBuffer, 'vimdiff')
+				endif
+				let resultBuffer = s:VCSReview(a:1)
+				if resultBuffer < 0
+					echomsg 'Can''t open revision ' . a:1
+					return resultBuffer
+				endif
+				let b:VCSCommandCommand = 'vimdiff'
+				diffthis
+				let t:vcsCommandVimDiffScratchList = [resultBuffer]
+				" If no split method is defined, cheat, and set it to vertical.
+				try
+					call s:OverrideOption('VCSCommandSplit', orientation)
+					let resultBuffer = s:VCSReview(a:2)
+				finally
+					call s:OverrideOption('VCSCommandSplit')
+				endtry
+				if resultBuffer < 0
+					echomsg 'Can''t open revision ' . a:1
+					return resultBuffer
+				endif
+				let b:VCSCommandCommand = 'vimdiff'
+				diffthis
+				let t:vcsCommandVimDiffScratchList += [resultBuffer]
+			else
+				" Add new buffer
+				call s:OverrideOption('VCSCommandEdit', 'split')
+				try
+					" Force splitting behavior, otherwise why use vimdiff?
+					call s:OverrideOption('VCSCommandSplit', orientation)
+					try
+						if(a:0 == 0)
+							let resultBuffer = s:VCSReview()
+						else
+							let resultBuffer = s:VCSReview(a:1)
+						endif
+					finally
+						call s:OverrideOption('VCSCommandSplit')
+					endtry
+				finally
+					call s:OverrideOption('VCSCommandEdit')
+				endtry
+				if resultBuffer < 0
+					echomsg 'Can''t open current revision'
+					return resultBuffer
+				endif
+				let b:VCSCommandCommand = 'vimdiff'
+				diffthis
+
+				if !exists('t:vcsCommandVimDiffSourceBuffer')
+					" New instance of vimdiff.
+					let t:vcsCommandVimDiffScratchList = [resultBuffer]
+
+					" This could have been invoked on a VCS result buffer, not the
+					" original buffer.
+					wincmd W
+					execute 'buffer' originalBuffer
+					" Store info for later original buffer restore
+					let t:vcsCommandVimDiffRestoreCmd =
+								\    '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.', ''&foldlevel'', '''.getbufvar(originalBuffer, '&foldlevel').''')'
+								\ . '|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 t:vcsCommandVimDiffScratchList += [resultBuffer]
+				endif
+			endif
+
+			let t:vcsCommandVimDiffSourceBuffer = 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 VCSCommand User VCSVimDiffFinish
+			finally
+				call setbufvar(currentBuffer, '&modeline', saveModeline)
+			endtry
+			return resultBuffer
+		finally
+			let s:isEditFileRunning = s:isEditFileRunning - 1
+		endtry
+	catch
+		call s:ReportError(v:exception)
+		return -1
+	endtry
+endfunction
+
+" Section: Public functions {{{1
+
+" Function: VCSCommandGetVCSType() {{{2
+" Sets the b:VCSCommandVCSType variable in the given buffer to the
+" appropriate source control system name.
+"
+" This uses the Identify extension function to test the buffer.  If the
+" Identify function returns VCSCOMMAND_IDENTIFY_EXACT, the match is considered
+" exact.  If the Identify function returns VCSCOMMAND_IDENTIFY_INEXACT, the
+" match is considered inexact, and is only applied if no exact match is found.
+" Multiple inexact matches is currently considered an error.
+
+function! VCSCommandGetVCSType(buffer)
+	let vcsType = getbufvar(a:buffer, 'VCSCommandVCSType')
+	if strlen(vcsType) > 0
+		return vcsType
+	endif
+	if exists("g:VCSCommandVCSTypeOverride")
+		let fullpath = fnamemodify(bufname(a:buffer), ':p')
+		for [path, vcsType] in g:VCSCommandVCSTypeOverride
+			if match(fullpath, path) > -1
+				call setbufvar(a:buffer, 'VCSCommandVCSType', vcsType)
+				return vcsType
+			endif
+		endfor
+	endif
+	let matches = []
+	for vcsType in keys(s:plugins)
+		let identified = s:plugins[vcsType][1].Identify(a:buffer)
+		if identified
+			if identified == g:VCSCOMMAND_IDENTIFY_EXACT
+				let matches = [vcsType]
+				break
+			else
+				let matches += [vcsType]
+			endif
+		endif
+	endfor
+	if len(matches) == 1
+		call setbufvar(a:buffer, 'VCSCommandVCSType', matches[0])
+		return matches[0]
+	elseif len(matches) == 0
+		throw 'No suitable plugin'
+	else
+		throw 'Too many matching VCS:  ' . join(matches)
+	endif
+endfunction
+
+" Function: VCSCommandChdir(directory) {{{2
+" Changes the current directory, respecting :lcd changes.
+
+function! VCSCommandChdir(directory)
+	let command = 'cd'
+	if exists("*haslocaldir") && haslocaldir()
+		let command = 'lcd'
+	endif
+	execute command escape(a:directory, ' ')
+endfunction
+
+" Function: VCSCommandChangeToCurrentFileDir() {{{2
+" Go to the directory in which the given file is located.
+
+function! VCSCommandChangeToCurrentFileDir(fileName)
+	let oldCwd = getcwd()
+	let newCwd = fnamemodify(resolve(a:fileName), ':p:h')
+	if strlen(newCwd) > 0
+		call VCSCommandChdir(newCwd)
+	endif
+	return oldCwd
+endfunction
+
+" Function: VCSCommandGetOriginalBuffer(vcsBuffer) {{{2
+" Attempts to locate the original file to which VCS operations were applied
+" for a given buffer.
+
+function! VCSCommandGetOriginalBuffer(vcsBuffer)
+	let origBuffer = getbufvar(a:vcsBuffer, 'VCSCommandOriginalBuffer')
+	if origBuffer
+		if bufexists(origBuffer)
+			return origBuffer
+		else
+			" Original buffer no longer exists.
+			throw 'Original buffer for this VCS buffer no longer exists.'
+		endif
+	else
+		" No original buffer
+		return a:vcsBuffer
+	endif
+endfunction
+
+" Function: VCSCommandRegisterModule(name, file, commandMap) {{{2
+" Allows VCS modules to register themselves.
+
+function! VCSCommandRegisterModule(name, path, commandMap, mappingMap)
+	let s:plugins[a:name] = [a:path, a:commandMap, a:mappingMap]
+	if !empty(a:mappingMap)
+				\ && !VCSCommandGetOption('VCSCommandDisableMappings', 0)
+				\ && !VCSCommandGetOption('VCSCommandDisableExtensionMappings', 0)
+		for shortcut in keys(a:mappingMap)
+			let expansion = ":call <SID>ExecuteExtensionMapping('" . shortcut . "')<CR>"
+			call s:CreateMapping(shortcut, expansion, a:name . " extension mapping " . shortcut)
+		endfor
+	endif
+	return s:VCSCommandUtility
+endfunction
+
+" Function: VCSCommandDoCommand(cmd, cmdName, statusText, [options]) {{{2
+" General skeleton for VCS function execution.  The given command is executed
+" after appending the current buffer name (or substituting it for
+" <VCSCOMMANDFILE>, if such a token is present).  The output is captured in a
+" new buffer.
+"
+" The optional 'options' Dictionary may contain the following options:
+" 	allowNonZeroExit:  if non-zero, if the underlying VCS command has a
+"		non-zero exit status, the command is still considered
+"		successfuly.  This defaults to zero.
+" Returns: name of the new command buffer containing the command results
+
+function! VCSCommandDoCommand(cmd, cmdName, statusText, options)
+	let allowNonZeroExit = 0
+	if has_key(a:options, 'allowNonZeroExit')
+		let allowNonZeroExit = a:options.allowNonZeroExit
+	endif
+
+	let originalBuffer = VCSCommandGetOriginalBuffer(bufnr('%'))
+	if originalBuffer == -1
+		throw 'Original buffer no longer exists, aborting.'
+	endif
+
+	let path = resolve(bufname(originalBuffer))
+
+	" Work with netrw or other systems where a directory listing is displayed in
+	" a buffer.
+
+	if isdirectory(path)
+		let fileName = '.'
+	else
+		let fileName = fnamemodify(path, ':t')
+	endif
+
+	if match(a:cmd, '<VCSCOMMANDFILE>') > 0
+		let fullCmd = substitute(a:cmd, '<VCSCOMMANDFILE>', fileName, 'g')
+	else
+		let fullCmd = a:cmd . ' -- "' . fileName . '"'
+	endif
+
+	" Change to the directory of the current buffer.  This is done for CVS, but
+	" is left in for other systems as it does not affect them negatively.
+
+	let oldCwd = VCSCommandChangeToCurrentFileDir(path)
+	try
+		let output = s:VCSCommandUtility.system(fullCmd)
+	finally
+		call VCSCommandChdir(oldCwd)
+	endtry
+
+	" HACK:  if line endings in the repository have been corrupted, the output
+	" of the command will be confused.
+	let output = substitute(output, "\r", '', 'g')
+
+	if v:shell_error && !allowNonZeroExit
+		if strlen(output) == 0
+			throw 'Version control command failed'
+		else
+			let output = substitute(output, '\n', '  ', 'g')
+			throw 'Version control command failed:  ' . output
+		endif
+	endif
+
+	if strlen(output) == 0
+		" Handle case of no output.  In this case, it is important to check the
+		" file status, especially since cvs edit/unedit may change the attributes
+		" of the file with no visible output.
+
+		checktime
+		return 0
+	endif
+
+	call s:EditFile(a:cmdName, originalBuffer, a:statusText)
+
+	silent 0put=output
+
+	" 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')
+		normal zR
+	endif
+
+	$d
+	1
+
+	" Define the environment and execute user-defined hooks.
+
+	silent do VCSCommand User VCSBufferCreated
+	return bufnr('%')
+endfunction
+
+" Function: VCSCommandGetOption(name, default) {{{2
+" Grab a user-specified option to override the default provided.  Options are
+" searched in the window, buffer, then global spaces.
+
+function! VCSCommandGetOption(name, default)
+	if has_key(s:optionOverrides, a:name) && len(s:optionOverrides[a:name]) > 0
+		return s:optionOverrides[a:name][-1]
+	elseif exists('w:' . a:name)
+		return w:{a:name}
+	elseif exists('b:' . a:name)
+		return b:{a:name}
+	elseif exists('g:' . a:name)
+		return g:{a:name}
+	else
+		return a:default
+	endif
+endfunction
+
+" Function: VCSCommandDisableBufferSetup() {{{2
+" Global function for deactivating the buffer autovariables.
+
+function! VCSCommandDisableBufferSetup()
+	let g:VCSCommandEnableBufferSetup = 0
+	silent! augroup! VCSCommandPlugin
+endfunction
+
+" Function: VCSCommandEnableBufferSetup() {{{2
+" Global function for activating the buffer autovariables.
+
+function! VCSCommandEnableBufferSetup()
+	let g:VCSCommandEnableBufferSetup = 1
+	augroup VCSCommandPlugin
+		au!
+		au BufEnter * call s:SetupBuffer()
+	augroup END
+
+	" Only auto-load if the plugin is fully loaded.  This gives other plugins a
+	" chance to run.
+	if g:loaded_VCSCommand == 2
+		call s:SetupBuffer()
+	endif
+endfunction
+
+" Function: VCSCommandGetStatusLine() {{{2
+" Default (sample) status line entry for VCS-controlled files.  This is only
+" useful if VCS-managed buffer mode is on (see the VCSCommandEnableBufferSetup
+" variable for how to do this).
+
+function! VCSCommandGetStatusLine()
+	if exists('b:VCSCommandCommand')
+		" This is a result buffer.  Return nothing because the buffer name
+		" contains information already.
+		return ''
+	endif
+
+	if exists('b:VCSCommandVCSType')
+				\ && exists('g:VCSCommandEnableBufferSetup')
+				\ && g:VCSCommandEnableBufferSetup
+				\ && exists('b:VCSCommandBufferInfo')
+		return '[' . join(extend([b:VCSCommandVCSType], b:VCSCommandBufferInfo), ' ') . ']'
+	else
+		return ''
+	endif
+endfunction
+
+" Section: Command definitions {{{1
+" Section: Primary commands {{{2
+com! -nargs=* VCSAdd call s:MarkOrigBufferForSetup(s:ExecuteVCSCommand('Add', [<f-args>]))
+com! -nargs=* -bang VCSAnnotate call s:VCSAnnotate(<q-bang>, <f-args>)
+com! -nargs=* -bang VCSBlame call s:VCSAnnotate(<q-bang>, <f-args>)
+com! -nargs=? -bang VCSCommit call s:VCSCommit(<q-bang>, <q-args>)
+com! -nargs=* VCSDelete call s:ExecuteVCSCommand('Delete', [<f-args>])
+com! -nargs=* VCSDiff call s:VCSDiff(<f-args>)
+com! -nargs=0 -bang VCSGotoOriginal call s:VCSGotoOriginal(<q-bang>)
+com! -nargs=* VCSInfo call s:ExecuteVCSCommand('Info', [<f-args>])
+com! -nargs=* VCSLock call s:MarkOrigBufferForSetup(s:ExecuteVCSCommand('Lock', [<f-args>]))
+com! -nargs=* VCSLog call s:ExecuteVCSCommand('Log', [<f-args>])
+com! -nargs=* VCSRemove call s:ExecuteVCSCommand('Delete', [<f-args>])
+com! -nargs=0 VCSRevert call s:MarkOrigBufferForSetup(s:ExecuteVCSCommand('Revert', []))
+com! -nargs=? VCSReview call s:VCSReview(<f-args>)
+com! -nargs=* VCSStatus call s:ExecuteVCSCommand('Status', [<f-args>])
+com! -nargs=* VCSUnlock call s:MarkOrigBufferForSetup(s:ExecuteVCSCommand('Unlock', [<f-args>]))
+com! -nargs=0 VCSUpdate call s:MarkOrigBufferForSetup(s:ExecuteVCSCommand('Update', []))
+com! -nargs=* VCSVimDiff call s:VCSVimDiff(<f-args>)
+
+" Section: VCS buffer management commands {{{2
+com! VCSCommandDisableBufferSetup call VCSCommandDisableBufferSetup()
+com! VCSCommandEnableBufferSetup call VCSCommandEnableBufferSetup()
+
+" Allow reloading VCSCommand.vim
+com! VCSReload let savedPlugins = s:plugins|let s:plugins = {}|call s:ClearMenu()|unlet! g:loaded_VCSCommand|runtime plugin/vcscommand.vim|for plugin in values(savedPlugins)|execute 'source' plugin[0]|endfor|unlet savedPlugins
+
+" Section: Plugin command mappings {{{1
+nnoremap <silent> <Plug>VCSAdd :VCSAdd<CR>
+nnoremap <silent> <Plug>VCSAnnotate :VCSAnnotate<CR>
+nnoremap <silent> <Plug>VCSCommit :VCSCommit<CR>
+nnoremap <silent> <Plug>VCSDelete :VCSDelete<CR>
+nnoremap <silent> <Plug>VCSDiff :VCSDiff<CR>
+nnoremap <silent> <Plug>VCSGotoOriginal :VCSGotoOriginal<CR>
+nnoremap <silent> <Plug>VCSClearAndGotoOriginal :VCSGotoOriginal!<CR>
+nnoremap <silent> <Plug>VCSInfo :VCSInfo<CR>
+nnoremap <silent> <Plug>VCSLock :VCSLock<CR>
+nnoremap <silent> <Plug>VCSLog :VCSLog<CR>
+nnoremap <silent> <Plug>VCSRevert :VCSRevert<CR>
+nnoremap <silent> <Plug>VCSReview :VCSReview<CR>
+nnoremap <silent> <Plug>VCSSplitAnnotate :VCSAnnotate!<CR>
+nnoremap <silent> <Plug>VCSStatus :VCSStatus<CR>
+nnoremap <silent> <Plug>VCSUnlock :VCSUnlock<CR>
+nnoremap <silent> <Plug>VCSUpdate :VCSUpdate<CR>
+nnoremap <silent> <Plug>VCSVimDiff :VCSVimDiff<CR>
+
+" Section: Default mappings {{{1
+
+let s:defaultMappings = [
+			\['a', 'VCSAdd'],
+			\['c', 'VCSCommit'],
+			\['D', 'VCSDelete'],
+			\['d', 'VCSDiff'],
+			\['G', 'VCSClearAndGotoOriginal'],
+			\['g', 'VCSGotoOriginal'],
+			\['i', 'VCSInfo'],
+			\['L', 'VCSLock'],
+			\['l', 'VCSLog'],
+			\['N', 'VCSSplitAnnotate'],
+			\['n', 'VCSAnnotate'],
+			\['q', 'VCSRevert'],
+			\['r', 'VCSReview'],
+			\['s', 'VCSStatus'],
+			\['U', 'VCSUnlock'],
+			\['u', 'VCSUpdate'],
+			\['v', 'VCSVimDiff'],
+			\]
+
+if !VCSCommandGetOption('VCSCommandDisableMappings', 0)
+	for [s:shortcut, s:vcsFunction] in VCSCommandGetOption('VCSCommandMappings', s:defaultMappings)
+		call s:CreateMapping(s:shortcut, '<Plug>' . s:vcsFunction, '''' . s:vcsFunction . '''')
+	endfor
+	unlet s:shortcut s:vcsFunction
+endif
+unlet s:defaultMappings
+
+" Section: Menu items {{{1
+
+let s:menuEnabled = !VCSCommandGetOption('VCSCommandDisableMenu', 0)
+let s:menuRoot = VCSCommandGetOption('VCSCommandMenuRoot', '&Plugin.VCS')
+let s:menuPriority = VCSCommandGetOption('VCSCommandMenuPriority', '')
+
+for [s:shortcut, s:command] in [
+			\['&Add', '<Plug>VCSAdd'],
+			\['A&nnotate', '<Plug>VCSAnnotate'],
+			\['&Commit', '<Plug>VCSCommit'],
+			\['Delete', '<Plug>VCSDelete'],
+			\['&Diff', '<Plug>VCSDiff'],
+			\['&Info', '<Plug>VCSInfo'],
+			\['&Log', '<Plug>VCSLog'],
+			\['Revert', '<Plug>VCSRevert'],
+			\['&Review', '<Plug>VCSReview'],
+			\['&Status', '<Plug>VCSStatus'],
+			\['&Update', '<Plug>VCSUpdate'],
+			\['&VimDiff', '<Plug>VCSVimDiff']
+			\]
+	call s:VCSCommandUtility.addMenuItem(s:shortcut, s:command)
+endfor
+unlet s:shortcut s:command
+
+" Section: Autocommands to restore vimdiff state {{{1
+augroup VimDiffRestore
+	au!
+	au BufUnload * call s:VimDiffRestore(str2nr(expand('<abuf>')))
+augroup END
+
+" Section: Optional activation of buffer management {{{1
+
+if VCSCommandGetOption('VCSCommandEnableBufferSetup', 0)
+	call VCSCommandEnableBufferSetup()
+endif
+
+" Section: VIM shutdown hook {{{1
+
+" Close all result buffers when VIM exits, to prevent them from being restored
+" via viminfo.
+
+" Function: s:CloseAllResultBuffers() {{{2
+" Closes all vcscommand result buffers.
+function! s:CloseAllResultBuffers()
+	" This avoids using bufdo as that may load buffers already loaded in another
+	" vim process, resulting in an error.
+	let buffnr = 1
+	let buffmaxnr = bufnr('$')
+	while buffnr <= buffmaxnr
+		if getbufvar(buffnr, 'VCSCommandOriginalBuffer') != ""
+			execute 'bw' buffnr
+		endif
+		let buffnr = buffnr + 1
+	endwhile
+endfunction
+
+augroup VCSCommandVIMShutdown
+	au!
+	au VimLeavePre * call s:CloseAllResultBuffers()
+augroup END
+
+" Section: Plugin completion {{{1
+
+let loaded_VCSCommand = 2
+
+silent do VCSCommand User VCSPluginFinish
+
+let &cpo = s:save_cpo