#!/bin/sh
# Tcl ignores the next line -*- tcl -*- \
 if test "z$*" = zversion \
 || test "z$*" = z--version; \
 then \
	echo 'git-gui version @@GITGUI_VERSION@@'; \
	exit; \
 fi; \
 argv0=$0; \
 exec wish "$argv0" -- "$@"

set appvers {@@GITGUI_VERSION@@}
set copyright [encoding convertfrom utf-8 {
Copyright © 2006, 2007 Shawn Pearce, et. al.

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA}]

######################################################################
##
## Tcl/Tk sanity check

if {[catch {package require Tcl 8.4} err]
 || [catch {package require Tk  8.4} err]
} {
	catch {wm withdraw .}
	tk_messageBox \
		-icon error \
		-type ok \
		-title [mc "git-gui: fatal error"] \
		-message $err
	exit 1
}

catch {rename send {}} ; # What an evil concept...

######################################################################
##
## locate our library

set oguilib {@@GITGUI_LIBDIR@@}
set oguirel {@@GITGUI_RELATIVE@@}
if {$oguirel eq {1}} {
	set oguilib [file dirname [file normalize $argv0]]
	if {[file tail $oguilib] eq {git-core}} {
		set oguilib [file dirname $oguilib]
	}
	set oguilib [file dirname $oguilib]
	set oguilib [file join $oguilib share git-gui lib]
	set oguimsg [file join $oguilib msgs]
} elseif {[string match @@* $oguirel]} {
	set oguilib [file join [file dirname [file normalize $argv0]] lib]
	set oguimsg [file join [file dirname [file normalize $argv0]] po]
} else {
	set oguimsg [file join $oguilib msgs]
}
unset oguirel

######################################################################
##
## enable verbose loading?

if {![catch {set _verbose $env(GITGUI_VERBOSE)}]} {
	unset _verbose
	rename auto_load real__auto_load
	proc auto_load {name args} {
		puts stderr "auto_load $name"
		return [uplevel 1 real__auto_load $name $args]
	}
	rename source real__source
	proc source {name} {
		puts stderr "source    $name"
		uplevel 1 real__source $name
	}
}

######################################################################
##
## Internationalization (i18n) through msgcat and gettext. See
## http://www.gnu.org/software/gettext/manual/html_node/Tcl.html

package require msgcat

proc _mc_trim {fmt} {
	set cmk [string first @@ $fmt]
	if {$cmk > 0} {
		return [string range $fmt 0 [expr {$cmk - 1}]]
	}
	return $fmt
}

proc mc {en_fmt args} {
	set fmt [_mc_trim [::msgcat::mc $en_fmt]]
	if {[catch {set msg [eval [list format $fmt] $args]} err]} {
		set msg [eval [list format [_mc_trim $en_fmt]] $args]
	}
	return $msg
}

proc strcat {args} {
	return [join $args {}]
}

::msgcat::mcload $oguimsg
unset oguimsg

######################################################################
##
## read only globals

set _appname {Git Gui}
set _gitdir {}
set _gitexec {}
set _reponame {}
set _iscygwin {}
set _search_path {}

set _trace [lsearch -exact $argv --trace]
if {$_trace >= 0} {
	set argv [lreplace $argv $_trace $_trace]
	set _trace 1
} else {
	set _trace 0
}

proc appname {} {
	global _appname
	return $_appname
}

proc gitdir {args} {
	global _gitdir
	if {$args eq {}} {
		return $_gitdir
	}
	return [eval [list file join $_gitdir] $args]
}

proc gitexec {args} {
	global _gitexec
	if {$_gitexec eq {}} {
		if {[catch {set _gitexec [git --exec-path]} err]} {
			error "Git not installed?\n\n$err"
		}
		if {[is_Cygwin]} {
			set _gitexec [exec cygpath \
				--windows \
				--absolute \
				$_gitexec]
		} else {
			set _gitexec [file normalize $_gitexec]
		}
	}
	if {$args eq {}} {
		return $_gitexec
	}
	return [eval [list file join $_gitexec] $args]
}

proc reponame {} {
	return $::_reponame
}

proc is_MacOSX {} {
	if {[tk windowingsystem] eq {aqua}} {
		return 1
	}
	return 0
}

proc is_Windows {} {
	if {$::tcl_platform(platform) eq {windows}} {
		return 1
	}
	return 0
}

proc is_Cygwin {} {
	global _iscygwin
	if {$_iscygwin eq {}} {
		if {$::tcl_platform(platform) eq {windows}} {
			if {[catch {set p [exec cygpath --windir]} err]} {
				set _iscygwin 0
			} else {
				set _iscygwin 1
			}
		} else {
			set _iscygwin 0
		}
	}
	return $_iscygwin
}

proc is_enabled {option} {
	global enabled_options
	if {[catch {set on $enabled_options($option)}]} {return 0}
	return $on
}

proc enable_option {option} {
	global enabled_options
	set enabled_options($option) 1
}

proc disable_option {option} {
	global enabled_options
	set enabled_options($option) 0
}

######################################################################
##
## config

proc is_many_config {name} {
	switch -glob -- $name {
	gui.recentrepo -
	remote.*.fetch -
	remote.*.push
		{return 1}
	*
		{return 0}
	}
}

proc is_config_true {name} {
	global repo_config
	if {[catch {set v $repo_config($name)}]} {
		return 0
	} elseif {$v eq {true} || $v eq {1} || $v eq {yes}} {
		return 1
	} else {
		return 0
	}
}

proc get_config {name} {
	global repo_config
	if {[catch {set v $repo_config($name)}]} {
		return {}
	} else {
		return $v
	}
}

######################################################################
##
## handy utils

proc _trace_exec {cmd} {
	if {!$::_trace} return
	set d {}
	foreach v $cmd {
		if {$d ne {}} {
			append d { }
		}
		if {[regexp {[ \t\r\n'"$?*]} $v]} {
			set v [sq $v]
		}
		append d $v
	}
	puts stderr $d
}

proc _git_cmd {name} {
	global _git_cmd_path

	if {[catch {set v $_git_cmd_path($name)}]} {
		switch -- $name {
		  version   -
		--version   -
		--exec-path { return [list $::_git $name] }
		}

		set p [gitexec git-$name$::_search_exe]
		if {[file exists $p]} {
			set v [list $p]
		} elseif {[is_Windows] && [file exists [gitexec git-$name]]} {
			# Try to determine what sort of magic will make
			# git-$name go and do its thing, because native
			# Tcl on Windows doesn't know it.
			#
			set p [gitexec git-$name]
			set f [open $p r]
			set s [gets $f]
			close $f

			switch -glob -- [lindex $s 0] {
			#!*sh     { set i sh     }
			#!*perl   { set i perl   }
			#!*python { set i python }
			default   { error "git-$name is not supported: $s" }
			}

			upvar #0 _$i interp
			if {![info exists interp]} {
				set interp [_which $i]
			}
			if {$interp eq {}} {
				error "git-$name requires $i (not in PATH)"
			}
			set v [concat [list $interp] [lrange $s 1 end] [list $p]]
		} else {
			# Assume it is builtin to git somehow and we
			# aren't actually able to see a file for it.
			#
			set v [list $::_git $name]
		}
		set _git_cmd_path($name) $v
	}
	return $v
}

proc _which {what args} {
	global env _search_exe _search_path

	if {$_search_path eq {}} {
		if {[is_Cygwin] && [regexp {^(/|\.:)} $env(PATH)]} {
			set _search_path [split [exec cygpath \
				--windows \
				--path \
				--absolute \
				$env(PATH)] {;}]
			set _search_exe .exe
		} elseif {[is_Windows]} {
			set gitguidir [file dirname [info script]]
			regsub -all ";" $gitguidir "\\;" gitguidir
			set env(PATH) "$gitguidir;$env(PATH)"
			set _search_path [split $env(PATH) {;}]
			set _search_exe .exe
		} else {
			set _search_path [split $env(PATH) :]
			set _search_exe {}
		}
	}

	if {[is_Windows] && [lsearch -exact $args -script] >= 0} {
		set suffix {}
	} else {
		set suffix $_search_exe
	}

	foreach p $_search_path {
		set p [file join $p $what$suffix]
		if {[file exists $p]} {
			return [file normalize $p]
		}
	}
	return {}
}

proc _lappend_nice {cmd_var} {
	global _nice
	upvar $cmd_var cmd

	if {![info exists _nice]} {
		set _nice [_which nice]
	}
	if {$_nice ne {}} {
		lappend cmd $_nice
	}
}

proc git {args} {
	set opt [list]

	while {1} {
		switch -- [lindex $args 0] {
		--nice {
			_lappend_nice opt
		}

		default {
			break
		}

		}

		set args [lrange $args 1 end]
	}

	set cmdp [_git_cmd [lindex $args 0]]
	set args [lrange $args 1 end]

	_trace_exec [concat $opt $cmdp $args]
	set result [eval exec $opt $cmdp $args]
	if {$::_trace} {
		puts stderr "< $result"
	}
	return $result
}

proc _open_stdout_stderr {cmd} {
	_trace_exec $cmd
	if {[catch {
			set fd [open [concat [list | ] $cmd] r]
		} err]} {
		if {   [lindex $cmd end] eq {2>@1}
		    && $err eq {can not find channel named "1"}
			} {
			# Older versions of Tcl 8.4 don't have this 2>@1 IO
			# redirect operator.  Fallback to |& cat for those.
			# The command was not actually started, so its safe
			# to try to start it a second time.
			#
			set fd [open [concat \
				[list | ] \
				[lrange $cmd 0 end-1] \
				[list |& cat] \
				] r]
		} else {
			error $err
		}
	}
	fconfigure $fd -eofchar {}
	return $fd
}

proc git_read {args} {
	set opt [list]

	while {1} {
		switch -- [lindex $args 0] {
		--nice {
			_lappend_nice opt
		}

		--stderr {
			lappend args 2>@1
		}

		default {
			break
		}

		}

		set args [lrange $args 1 end]
	}

	set cmdp [_git_cmd [lindex $args 0]]
	set args [lrange $args 1 end]

	return [_open_stdout_stderr [concat $opt $cmdp $args]]
}

proc git_write {args} {
	set opt [list]

	while {1} {
		switch -- [lindex $args 0] {
		--nice {
			_lappend_nice opt
		}

		default {
			break
		}

		}

		set args [lrange $args 1 end]
	}

	set cmdp [_git_cmd [lindex $args 0]]
	set args [lrange $args 1 end]

	_trace_exec [concat $opt $cmdp $args]
	return [open [concat [list | ] $opt $cmdp $args] w]
}

proc githook_read {hook_name args} {
	set pchook [gitdir hooks $hook_name]
	lappend args 2>@1

	# On Windows [file executable] might lie so we need to ask
	# the shell if the hook is executable.  Yes that's annoying.
	#
	if {[is_Windows]} {
		upvar #0 _sh interp
		if {![info exists interp]} {
			set interp [_which sh]
		}
		if {$interp eq {}} {
			error "hook execution requires sh (not in PATH)"
		}

		set scr {if test -x "$1";then exec "$@";fi}
		set sh_c [list $interp -c $scr $interp $pchook]
		return [_open_stdout_stderr [concat $sh_c $args]]
	}

	if {[file executable $pchook]} {
		return [_open_stdout_stderr [concat [list $pchook] $args]]
	}

	return {}
}

proc kill_file_process {fd} {
	set process [pid $fd]

	catch {
		if {[is_Windows]} {
			# Use a Cygwin-specific flag to allow killing
			# native Windows processes
			exec kill -f $process
		} else {
			exec kill $process
		}
	}
}

proc sq {value} {
	regsub -all ' $value "'\\''" value
	return "'$value'"
}

proc load_current_branch {} {
	global current_branch is_detached

	set fd [open [gitdir HEAD] r]
	if {[gets $fd ref] < 1} {
		set ref {}
	}
	close $fd

	set pfx {ref: refs/heads/}
	set len [string length $pfx]
	if {[string equal -length $len $pfx $ref]} {
		# We're on a branch.  It might not exist.  But
		# HEAD looks good enough to be a branch.
		#
		set current_branch [string range $ref $len end]
		set is_detached 0
	} else {
		# Assume this is a detached head.
		#
		set current_branch HEAD
		set is_detached 1
	}
}

auto_load tk_optionMenu
rename tk_optionMenu real__tkOptionMenu
proc tk_optionMenu {w varName args} {
	set m [eval real__tkOptionMenu $w $varName $args]
	$m configure -font font_ui
	$w configure -font font_ui
	return $m
}

proc rmsel_tag {text} {
	$text tag conf sel \
		-background [$text cget -background] \
		-foreground [$text cget -foreground] \
		-borderwidth 0
	$text tag conf in_sel -background lightgray
	bind $text <Motion> break
	return $text
}

set root_exists 0
bind . <Visibility> {
	bind . <Visibility> {}
	set root_exists 1
}

if {[is_Windows]} {
	wm iconbitmap . -default $oguilib/git-gui.ico
}

######################################################################
##
## config defaults

set cursor_ptr arrow
font create font_diff -family Courier -size 10
font create font_ui
catch {
	label .dummy
	eval font configure font_ui [font actual [.dummy cget -font]]
	destroy .dummy
}

font create font_uiitalic
font create font_uibold
font create font_diffbold
font create font_diffitalic

foreach class {Button Checkbutton Entry Label
		Labelframe Listbox Menu Message
		Radiobutton Spinbox Text} {
	option add *$class.font font_ui
}
unset class

if {[is_Windows] || [is_MacOSX]} {
	option add *Menu.tearOff 0
}

if {[is_MacOSX]} {
	set M1B M1
	set M1T Cmd
} else {
	set M1B Control
	set M1T Ctrl
}

proc bind_button3 {w cmd} {
	bind $w <Any-Button-3> $cmd
	if {[is_MacOSX]} {
		# Mac OS X sends Button-2 on right click through three-button mouse,
		# or through trackpad right-clicking (two-finger touch + click).
		bind $w <Any-Button-2> $cmd
		bind $w <Control-Button-1> $cmd
	}
}

proc apply_config {} {
	global repo_config font_descs

	foreach option $font_descs {
		set name [lindex $option 0]
		set font [lindex $option 1]
		if {[catch {
			set need_weight 1
			foreach {cn cv} $repo_config(gui.$name) {
				if {$cn eq {-weight}} {
					set need_weight 0
				}
				font configure $font $cn $cv
			}
			if {$need_weight} {
				font configure $font -weight normal
			}
			} err]} {
			error_popup [strcat [mc "Invalid font specified in %s:" "gui.$name"] "\n\n$err"]
		}
		foreach {cn cv} [font configure $font] {
			font configure ${font}bold $cn $cv
			font configure ${font}italic $cn $cv
		}
		font configure ${font}bold -weight bold
		font configure ${font}italic -slant italic
	}
}

set default_config(branch.autosetupmerge) true
set default_config(merge.tool) {}
set default_config(merge.keepbackup) true
set default_config(merge.diffstat) true
set default_config(merge.summary) false
set default_config(merge.verbosity) 2
set default_config(user.name) {}
set default_config(user.email) {}

set default_config(gui.matchtrackingbranch) false
set default_config(gui.pruneduringfetch) false
set default_config(gui.trustmtime) false
set default_config(gui.fastcopyblame) false
set default_config(gui.copyblamethreshold) 40
set default_config(gui.blamehistoryctx) 7
set default_config(gui.diffcontext) 5
set default_config(gui.commitmsgwidth) 75
set default_config(gui.newbranchtemplate) {}
set default_config(gui.spellingdictionary) {}
set default_config(gui.fontui) [font configure font_ui]
set default_config(gui.fontdiff) [font configure font_diff]
set font_descs {
	{fontui   font_ui   {mc "Main Font"}}
	{fontdiff font_diff {mc "Diff/Console Font"}}
}

######################################################################
##
## find git

set _git  [_which git]
if {$_git eq {}} {
	catch {wm withdraw .}
	tk_messageBox \
		-icon error \
		-type ok \
		-title [mc "git-gui: fatal error"] \
		-message [mc "Cannot find git in PATH."]
	exit 1
}

######################################################################
##
## version check

if {[catch {set _git_version [git --version]} err]} {
	catch {wm withdraw .}
	tk_messageBox \
		-icon error \
		-type ok \
		-title [mc "git-gui: fatal error"] \
		-message "Cannot determine Git version:

$err

[appname] requires Git 1.5.0 or later."
	exit 1
}
if {![regsub {^git version } $_git_version {} _git_version]} {
	catch {wm withdraw .}
	tk_messageBox \
		-icon error \
		-type ok \
		-title [mc "git-gui: fatal error"] \
		-message [strcat [mc "Cannot parse Git version string:"] "\n\n$_git_version"]
	exit 1
}

set _real_git_version $_git_version
regsub -- {[\-\.]dirty$} $_git_version {} _git_version
regsub {\.[0-9]+\.g[0-9a-f]+$} $_git_version {} _git_version
regsub {\.rc[0-9]+$} $_git_version {} _git_version
regsub {\.GIT$} $_git_version {} _git_version
regsub {\.[a-zA-Z]+\.[0-9]+$} $_git_version {} _git_version

if {![regexp {^[1-9]+(\.[0-9]+)+$} $_git_version]} {
	catch {wm withdraw .}
	if {[tk_messageBox \
		-icon warning \
		-type yesno \
		-default no \
		-title "[appname]: warning" \
		 -message [mc "Git version cannot be determined.

%s claims it is version '%s'.

%s requires at least Git 1.5.0 or later.

Assume '%s' is version 1.5.0?
" $_git $_real_git_version [appname] $_real_git_version]] eq {yes}} {
		set _git_version 1.5.0
	} else {
		exit 1
	}
}
unset _real_git_version

proc git-version {args} {
	global _git_version

	switch [llength $args] {
	0 {
		return $_git_version
	}

	2 {
		set op [lindex $args 0]
		set vr [lindex $args 1]
		set cm [package vcompare $_git_version $vr]
		return [expr $cm $op 0]
	}

	4 {
		set type [lindex $args 0]
		set name [lindex $args 1]
		set parm [lindex $args 2]
		set body [lindex $args 3]

		if {($type ne {proc} && $type ne {method})} {
			error "Invalid arguments to git-version"
		}
		if {[llength $body] < 2 || [lindex $body end-1] ne {default}} {
			error "Last arm of $type $name must be default"
		}

		foreach {op vr cb} [lrange $body 0 end-2] {
			if {[git-version $op $vr]} {
				return [uplevel [list $type $name $parm $cb]]
			}
		}

		return [uplevel [list $type $name $parm [lindex $body end]]]
	}

	default {
		error "git-version >= x"
	}

	}
}

if {[git-version < 1.5]} {
	catch {wm withdraw .}
	tk_messageBox \
		-icon error \
		-type ok \
		-title [mc "git-gui: fatal error"] \
		-message "[appname] requires Git 1.5.0 or later.

You are using [git-version]:

[git --version]"
	exit 1
}

######################################################################
##
## configure our library

set idx [file join $oguilib tclIndex]
if {[catch {set fd [open $idx r]} err]} {
	catch {wm withdraw .}
	tk_messageBox \
		-icon error \
		-type ok \
		-title [mc "git-gui: fatal error"] \
		-message $err
	exit 1
}
if {[gets $fd] eq {# Autogenerated by git-gui Makefile}} {
	set idx [list]
	while {[gets $fd n] >= 0} {
		if {$n ne {} && ![string match #* $n]} {
			lappend idx $n
		}
	}
} else {
	set idx {}
}
close $fd

if {$idx ne {}} {
	set loaded [list]
	foreach p $idx {
		if {[lsearch -exact $loaded $p] >= 0} continue
		source [file join $oguilib $p]
		lappend loaded $p
	}
	unset loaded p
} else {
	set auto_path [concat [list $oguilib] $auto_path]
}
unset -nocomplain idx fd

######################################################################
##
## config file parsing

git-version proc _parse_config {arr_name args} {
	>= 1.5.3 {
		upvar $arr_name arr
		array unset arr
		set buf {}
		catch {
			set fd_rc [eval \
				[list git_read config] \
				$args \
				[list --null --list]]
			fconfigure $fd_rc -translation binary
			set buf [read $fd_rc]
			close $fd_rc
		}
		foreach line [split $buf "\0"] {
			if {[regexp {^([^\n]+)\n(.*)$} $line line name value]} {
				if {[is_many_config $name]} {
					lappend arr($name) $value
				} else {
					set arr($name) $value
				}
			}
		}
	}
	default {
		upvar $arr_name arr
		array unset arr
		catch {
			set fd_rc [eval [list git_read config --list] $args]
			while {[gets $fd_rc line] >= 0} {
				if {[regexp {^([^=]+)=(.*)$} $line line name value]} {
					if {[is_many_config $name]} {
						lappend arr($name) $value
					} else {
						set arr($name) $value
					}
				}
			}
			close $fd_rc
		}
	}
}

proc load_config {include_global} {
	global repo_config global_config default_config

	if {$include_global} {
		_parse_config global_config --global
	}
	_parse_config repo_config

	foreach name [array names default_config] {
		if {[catch {set v $global_config($name)}]} {
			set global_config($name) $default_config($name)
		}
		if {[catch {set v $repo_config($name)}]} {
			set repo_config($name) $default_config($name)
		}
	}
}

######################################################################
##
## feature option selection

if {[regexp {^git-(.+)$} [file tail $argv0] _junk subcommand]} {
	unset _junk
} else {
	set subcommand gui
}
if {$subcommand eq {gui.sh}} {
	set subcommand gui
}
if {$subcommand eq {gui} && [llength $argv] > 0} {
	set subcommand [lindex $argv 0]
	set argv [lrange $argv 1 end]
}

enable_option multicommit
enable_option branch
enable_option transport
disable_option bare

switch -- $subcommand {
browser -
blame {
	enable_option bare

	disable_option multicommit
	disable_option branch
	disable_option transport
}
citool {
	enable_option singlecommit

	disable_option multicommit
	disable_option branch
	disable_option transport
}
}

######################################################################
##
## repository setup

if {[catch {
		set _gitdir $env(GIT_DIR)
		set _prefix {}
		}]
	&& [catch {
		set _gitdir [git rev-parse --git-dir]
		set _prefix [git rev-parse --show-prefix]
	} err]} {
	load_config 1
	apply_config
	choose_repository::pick
}
if {![file isdirectory $_gitdir] && [is_Cygwin]} {
	catch {set _gitdir [exec cygpath --windows $_gitdir]}
}
if {![file isdirectory $_gitdir]} {
	catch {wm withdraw .}
	error_popup [strcat [mc "Git directory not found:"] "\n\n$_gitdir"]
	exit 1
}
if {$_prefix ne {}} {
	regsub -all {[^/]+/} $_prefix ../ cdup
	if {[catch {cd $cdup} err]} {
		catch {wm withdraw .}
		error_popup [strcat [mc "Cannot move to top of working directory:"] "\n\n$err"]
		exit 1
	}
	unset cdup
} elseif {![is_enabled bare]} {
	if {[lindex [file split $_gitdir] end] ne {.git}} {
		catch {wm withdraw .}
		error_popup [strcat [mc "Cannot use funny .git directory:"] "\n\n$_gitdir"]
		exit 1
	}
	if {[catch {cd [file dirname $_gitdir]} err]} {
		catch {wm withdraw .}
		error_popup [strcat [mc "No working directory"] " [file dirname $_gitdir]:\n\n$err"]
		exit 1
	}
}
set _reponame [file split [file normalize $_gitdir]]
if {[lindex $_reponame end] eq {.git}} {
	set _reponame [lindex $_reponame end-1]
} else {
	set _reponame [lindex $_reponame end]
}

######################################################################
##
## global init

set current_diff_path {}
set current_diff_side {}
set diff_actions [list]

set HEAD {}
set PARENT {}
set MERGE_HEAD [list]
set commit_type {}
set empty_tree {}
set current_branch {}
set is_detached 0
set current_diff_path {}
set is_3way_diff 0
set selected_commit_type new

######################################################################
##
## task management

set rescan_active 0
set diff_active 0
set last_clicked {}

set disable_on_lock [list]
set index_lock_type none

proc lock_index {type} {
	global index_lock_type disable_on_lock

	if {$index_lock_type eq {none}} {
		set index_lock_type $type
		foreach w $disable_on_lock {
			uplevel #0 $w disabled
		}
		return 1
	} elseif {$index_lock_type eq "begin-$type"} {
		set index_lock_type $type
		return 1
	}
	return 0
}

proc unlock_index {} {
	global index_lock_type disable_on_lock

	set index_lock_type none
	foreach w $disable_on_lock {
		uplevel #0 $w normal
	}
}

######################################################################
##
## status

proc repository_state {ctvar hdvar mhvar} {
	global current_branch
	upvar $ctvar ct $hdvar hd $mhvar mh

	set mh [list]

	load_current_branch
	if {[catch {set hd [git rev-parse --verify HEAD]}]} {
		set hd {}
		set ct initial
		return
	}

	set merge_head [gitdir MERGE_HEAD]
	if {[file exists $merge_head]} {
		set ct merge
		set fd_mh [open $merge_head r]
		while {[gets $fd_mh line] >= 0} {
			lappend mh $line
		}
		close $fd_mh
		return
	}

	set ct normal
}

proc PARENT {} {
	global PARENT empty_tree

	set p [lindex $PARENT 0]
	if {$p ne {}} {
		return $p
	}
	if {$empty_tree eq {}} {
		set empty_tree [git mktree << {}]
	}
	return $empty_tree
}

proc rescan {after {honor_trustmtime 1}} {
	global HEAD PARENT MERGE_HEAD commit_type
	global ui_index ui_workdir ui_comm
	global rescan_active file_states
	global repo_config

	if {$rescan_active > 0 || ![lock_index read]} return

	repository_state newType newHEAD newMERGE_HEAD
	if {[string match amend* $commit_type]
		&& $newType eq {normal}
		&& $newHEAD eq $HEAD} {
	} else {
		set HEAD $newHEAD
		set PARENT $newHEAD
		set MERGE_HEAD $newMERGE_HEAD
		set commit_type $newType
	}

	array unset file_states

	if {!$::GITGUI_BCK_exists &&
		(![$ui_comm edit modified]
		|| [string trim [$ui_comm get 0.0 end]] eq {})} {
		if {[string match amend* $commit_type]} {
		} elseif {[load_message GITGUI_MSG]} {
		} elseif {[load_message MERGE_MSG]} {
		} elseif {[load_message SQUASH_MSG]} {
		}
		$ui_comm edit reset
		$ui_comm edit modified false
	}

	if {$honor_trustmtime && $repo_config(gui.trustmtime) eq {true}} {
		rescan_stage2 {} $after
	} else {
		set rescan_active 1
		ui_status [mc "Refreshing file status..."]
		set fd_rf [git_read update-index \
			-q \
			--unmerged \
			--ignore-missing \
			--refresh \
			]
		fconfigure $fd_rf -blocking 0 -translation binary
		fileevent $fd_rf readable \
			[list rescan_stage2 $fd_rf $after]
	}
}

if {[is_Cygwin]} {
	set is_git_info_exclude {}
	proc have_info_exclude {} {
		global is_git_info_exclude

		if {$is_git_info_exclude eq {}} {
			if {[catch {exec test -f [gitdir info exclude]}]} {
				set is_git_info_exclude 0
			} else {
				set is_git_info_exclude 1
			}
		}
		return $is_git_info_exclude
	}
} else {
	proc have_info_exclude {} {
		return [file readable [gitdir info exclude]]
	}
}

proc rescan_stage2 {fd after} {
	global rescan_active buf_rdi buf_rdf buf_rlo

	if {$fd ne {}} {
		read $fd
		if {![eof $fd]} return
		close $fd
	}

	set ls_others [list --exclude-per-directory=.gitignore]
	if {[have_info_exclude]} {
		lappend ls_others "--exclude-from=[gitdir info exclude]"
	}
	set user_exclude [get_config core.excludesfile]
	if {$user_exclude ne {} && [file readable $user_exclude]} {
		lappend ls_others "--exclude-from=$user_exclude"
	}

	set buf_rdi {}
	set buf_rdf {}
	set buf_rlo {}

	set rescan_active 3
	ui_status [mc "Scanning for modified files ..."]
	set fd_di [git_read diff-index --cached -z [PARENT]]
	set fd_df [git_read diff-files -z]
	set fd_lo [eval git_read ls-files --others -z $ls_others]

	fconfigure $fd_di -blocking 0 -translation binary -encoding binary
	fconfigure $fd_df -blocking 0 -translation binary -encoding binary
	fconfigure $fd_lo -blocking 0 -translation binary -encoding binary
	fileevent $fd_di readable [list read_diff_index $fd_di $after]
	fileevent $fd_df readable [list read_diff_files $fd_df $after]
	fileevent $fd_lo readable [list read_ls_others $fd_lo $after]
}

proc load_message {file} {
	global ui_comm

	set f [gitdir $file]
	if {[file isfile $f]} {
		if {[catch {set fd [open $f r]}]} {
			return 0
		}
		fconfigure $fd -eofchar {}
		set content [string trim [read $fd]]
		close $fd
		regsub -all -line {[ \r\t]+$} $content {} content
		$ui_comm delete 0.0 end
		$ui_comm insert end $content
		return 1
	}
	return 0
}

proc read_diff_index {fd after} {
	global buf_rdi

	append buf_rdi [read $fd]
	set c 0
	set n [string length $buf_rdi]
	while {$c < $n} {
		set z1 [string first "\0" $buf_rdi $c]
		if {$z1 == -1} break
		incr z1
		set z2 [string first "\0" $buf_rdi $z1]
		if {$z2 == -1} break

		incr c
		set i [split [string range $buf_rdi $c [expr {$z1 - 2}]] { }]
		set p [string range $buf_rdi $z1 [expr {$z2 - 1}]]
		merge_state \
			[encoding convertfrom $p] \
			[lindex $i 4]? \
			[list [lindex $i 0] [lindex $i 2]] \
			[list]
		set c $z2
		incr c
	}
	if {$c < $n} {
		set buf_rdi [string range $buf_rdi $c end]
	} else {
		set buf_rdi {}
	}

	rescan_done $fd buf_rdi $after
}

proc read_diff_files {fd after} {
	global buf_rdf

	append buf_rdf [read $fd]
	set c 0
	set n [string length $buf_rdf]
	while {$c < $n} {
		set z1 [string first "\0" $buf_rdf $c]
		if {$z1 == -1} break
		incr z1
		set z2 [string first "\0" $buf_rdf $z1]
		if {$z2 == -1} break

		incr c
		set i [split [string range $buf_rdf $c [expr {$z1 - 2}]] { }]
		set p [string range $buf_rdf $z1 [expr {$z2 - 1}]]
		merge_state \
			[encoding convertfrom $p] \
			?[lindex $i 4] \
			[list] \
			[list [lindex $i 0] [lindex $i 2]]
		set c $z2
		incr c
	}
	if {$c < $n} {
		set buf_rdf [string range $buf_rdf $c end]
	} else {
		set buf_rdf {}
	}

	rescan_done $fd buf_rdf $after
}

proc read_ls_others {fd after} {
	global buf_rlo

	append buf_rlo [read $fd]
	set pck [split $buf_rlo "\0"]
	set buf_rlo [lindex $pck end]
	foreach p [lrange $pck 0 end-1] {
		set p [encoding convertfrom $p]
		if {[string index $p end] eq {/}} {
			set p [string range $p 0 end-1]
		}
		merge_state $p ?O
	}
	rescan_done $fd buf_rlo $after
}

proc rescan_done {fd buf after} {
	global rescan_active current_diff_path
	global file_states repo_config
	upvar $buf to_clear

	if {![eof $fd]} return
	set to_clear {}
	close $fd
	if {[incr rescan_active -1] > 0} return

	prune_selection
	unlock_index
	display_all_files
	if {$current_diff_path ne {}} reshow_diff
	if {$current_diff_path eq {}} select_first_diff

	uplevel #0 $after
}

proc prune_selection {} {
	global file_states selected_paths

	foreach path [array names selected_paths] {
		if {[catch {set still_here $file_states($path)}]} {
			unset selected_paths($path)
		}
	}
}

######################################################################
##
## ui helpers

proc mapicon {w state path} {
	global all_icons

	if {[catch {set r $all_icons($state$w)}]} {
		puts "error: no icon for $w state={$state} $path"
		return file_plain
	}
	return $r
}

proc mapdesc {state path} {
	global all_descs

	if {[catch {set r $all_descs($state)}]} {
		puts "error: no desc for state={$state} $path"
		return $state
	}
	return $r
}

proc ui_status {msg} {
	global main_status
	if {[info exists main_status]} {
		$main_status show $msg
	}
}

proc ui_ready {{test {}}} {
	global main_status
	if {[info exists main_status]} {
		$main_status show [mc "Ready."] $test
	}
}

proc escape_path {path} {
	regsub -all {\\} $path "\\\\" path
	regsub -all "\n" $path "\\n" path
	return $path
}

proc short_path {path} {
	return [escape_path [lindex [file split $path] end]]
}

set next_icon_id 0
set null_sha1 [string repeat 0 40]

proc merge_state {path new_state {head_info {}} {index_info {}}} {
	global file_states next_icon_id null_sha1

	set s0 [string index $new_state 0]
	set s1 [string index $new_state 1]

	if {[catch {set info $file_states($path)}]} {
		set state __
		set icon n[incr next_icon_id]
	} else {
		set state [lindex $info 0]
		set icon [lindex $info 1]
		if {$head_info eq {}}  {set head_info  [lindex $info 2]}
		if {$index_info eq {}} {set index_info [lindex $info 3]}
	}

	if     {$s0 eq {?}} {set s0 [string index $state 0]} \
	elseif {$s0 eq {_}} {set s0 _}

	if     {$s1 eq {?}} {set s1 [string index $state 1]} \
	elseif {$s1 eq {_}} {set s1 _}

	if {$s0 eq {A} && $s1 eq {_} && $head_info eq {}} {
		set head_info [list 0 $null_sha1]
	} elseif {$s0 ne {_} && [string index $state 0] eq {_}
		&& $head_info eq {}} {
		set head_info $index_info
	}

	set file_states($path) [list $s0$s1 $icon \
		$head_info $index_info \
		]
	return $state
}

proc display_file_helper {w path icon_name old_m new_m} {
	global file_lists

	if {$new_m eq {_}} {
		set lno [lsearch -sorted -exact $file_lists($w) $path]
		if {$lno >= 0} {
			set file_lists($w) [lreplace $file_lists($w) $lno $lno]
			incr lno
			$w conf -state normal
			$w delete $lno.0 [expr {$lno + 1}].0
			$w conf -state disabled
		}
	} elseif {$old_m eq {_} && $new_m ne {_}} {
		lappend file_lists($w) $path
		set file_lists($w) [lsort -unique $file_lists($w)]
		set lno [lsearch -sorted -exact $file_lists($w) $path]
		incr lno
		$w conf -state normal
		$w image create $lno.0 \
			-align center -padx 5 -pady 1 \
			-name $icon_name \
			-image [mapicon $w $new_m $path]
		$w insert $lno.1 "[escape_path $path]\n"
		$w conf -state disabled
	} elseif {$old_m ne $new_m} {
		$w conf -state normal
		$w image conf $icon_name -image [mapicon $w $new_m $path]
		$w conf -state disabled
	}
}

proc display_file {path state} {
	global file_states selected_paths
	global ui_index ui_workdir

	set old_m [merge_state $path $state]
	set s $file_states($path)
	set new_m [lindex $s 0]
	set icon_name [lindex $s 1]

	set o [string index $old_m 0]
	set n [string index $new_m 0]
	if {$o eq {U}} {
		set o _
	}
	if {$n eq {U}} {
		set n _
	}
	display_file_helper	$ui_index $path $icon_name $o $n

	if {[string index $old_m 0] eq {U}} {
		set o U
	} else {
		set o [string index $old_m 1]
	}
	if {[string index $new_m 0] eq {U}} {
		set n U
	} else {
		set n [string index $new_m 1]
	}
	display_file_helper	$ui_workdir $path $icon_name $o $n

	if {$new_m eq {__}} {
		unset file_states($path)
		catch {unset selected_paths($path)}
	}
}

proc display_all_files_helper {w path icon_name m} {
	global file_lists

	lappend file_lists($w) $path
	set lno [expr {[lindex [split [$w index end] .] 0] - 1}]
	$w image create end \
		-align center -padx 5 -pady 1 \
		-name $icon_name \
		-image [mapicon $w $m $path]
	$w insert end "[escape_path $path]\n"
}

proc display_all_files {} {
	global ui_index ui_workdir
	global file_states file_lists
	global last_clicked

	$ui_index conf -state normal
	$ui_workdir conf -state normal

	$ui_index delete 0.0 end
	$ui_workdir delete 0.0 end
	set last_clicked {}

	set file_lists($ui_index) [list]
	set file_lists($ui_workdir) [list]

	foreach path [lsort [array names file_states]] {
		set s $file_states($path)
		set m [lindex $s 0]
		set icon_name [lindex $s 1]

		set s [string index $m 0]
		if {$s ne {U} && $s ne {_}} {
			display_all_files_helper $ui_index $path \
				$icon_name $s
		}

		if {[string index $m 0] eq {U}} {
			set s U
		} else {
			set s [string index $m 1]
		}
		if {$s ne {_}} {
			display_all_files_helper $ui_workdir $path \
				$icon_name $s
		}
	}

	$ui_index conf -state disabled
	$ui_workdir conf -state disabled
}

######################################################################
##
## icons

set filemask {
#define mask_width 14
#define mask_height 15
static unsigned char mask_bits[] = {
   0xfe, 0x1f, 0xfe, 0x1f, 0xfe, 0x1f, 0xfe, 0x1f, 0xfe, 0x1f, 0xfe, 0x1f,
   0xfe, 0x1f, 0xfe, 0x1f, 0xfe, 0x1f, 0xfe, 0x1f, 0xfe, 0x1f, 0xfe, 0x1f,
   0xfe, 0x1f, 0xfe, 0x1f, 0xfe, 0x1f};
}

image create bitmap file_plain -background white -foreground black -data {
#define plain_width 14
#define plain_height 15
static unsigned char plain_bits[] = {
   0xfe, 0x01, 0x02, 0x03, 0x02, 0x05, 0x02, 0x09, 0x02, 0x1f, 0x02, 0x10,
   0x02, 0x10, 0x02, 0x10, 0x02, 0x10, 0x02, 0x10, 0x02, 0x10, 0x02, 0x10,
   0x02, 0x10, 0x02, 0x10, 0xfe, 0x1f};
} -maskdata $filemask

image create bitmap file_mod -background white -foreground blue -data {
#define mod_width 14
#define mod_height 15
static unsigned char mod_bits[] = {
   0xfe, 0x01, 0x02, 0x03, 0x7a, 0x05, 0x02, 0x09, 0x7a, 0x1f, 0x02, 0x10,
   0xfa, 0x17, 0x02, 0x10, 0xfa, 0x17, 0x02, 0x10, 0xfa, 0x17, 0x02, 0x10,
   0xfa, 0x17, 0x02, 0x10, 0xfe, 0x1f};
} -maskdata $filemask

image create bitmap file_fulltick -background white -foreground "#007000" -data {
#define file_fulltick_width 14
#define file_fulltick_height 15
static unsigned char file_fulltick_bits[] = {
   0xfe, 0x01, 0x02, 0x1a, 0x02, 0x0c, 0x02, 0x0c, 0x02, 0x16, 0x02, 0x16,
   0x02, 0x13, 0x00, 0x13, 0x86, 0x11, 0x8c, 0x11, 0xd8, 0x10, 0xf2, 0x10,
   0x62, 0x10, 0x02, 0x10, 0xfe, 0x1f};
} -maskdata $filemask

image create bitmap file_parttick -background white -foreground "#005050" -data {
#define parttick_width 14
#define parttick_height 15
static unsigned char parttick_bits[] = {
   0xfe, 0x01, 0x02, 0x03, 0x7a, 0x05, 0x02, 0x09, 0x7a, 0x1f, 0x02, 0x10,
   0x7a, 0x14, 0x02, 0x16, 0x02, 0x13, 0x8a, 0x11, 0xda, 0x10, 0x72, 0x10,
   0x22, 0x10, 0x02, 0x10, 0xfe, 0x1f};
} -maskdata $filemask

image create bitmap file_question -background white -foreground black -data {
#define file_question_width 14
#define file_question_height 15
static unsigned char file_question_bits[] = {
   0xfe, 0x01, 0x02, 0x02, 0xe2, 0x04, 0xf2, 0x09, 0x1a, 0x1b, 0x0a, 0x13,
   0x82, 0x11, 0xc2, 0x10, 0x62, 0x10, 0x62, 0x10, 0x02, 0x10, 0x62, 0x10,
   0x62, 0x10, 0x02, 0x10, 0xfe, 0x1f};
} -maskdata $filemask

image create bitmap file_removed -background white -foreground red -data {
#define file_removed_width 14
#define file_removed_height 15
static unsigned char file_removed_bits[] = {
   0xfe, 0x01, 0x02, 0x03, 0x02, 0x05, 0x02, 0x09, 0x02, 0x1f, 0x02, 0x10,
   0x1a, 0x16, 0x32, 0x13, 0xe2, 0x11, 0xc2, 0x10, 0xe2, 0x11, 0x32, 0x13,
   0x1a, 0x16, 0x02, 0x10, 0xfe, 0x1f};
} -maskdata $filemask

image create bitmap file_merge -background white -foreground blue -data {
#define file_merge_width 14
#define file_merge_height 15
static unsigned char file_merge_bits[] = {
   0xfe, 0x01, 0x02, 0x03, 0x62, 0x05, 0x62, 0x09, 0x62, 0x1f, 0x62, 0x10,
   0xfa, 0x11, 0xf2, 0x10, 0x62, 0x10, 0x02, 0x10, 0xfa, 0x17, 0x02, 0x10,
   0xfa, 0x17, 0x02, 0x10, 0xfe, 0x1f};
} -maskdata $filemask

image create bitmap file_statechange -background white -foreground green -data {
#define file_merge_width 14
#define file_merge_height 15
static unsigned char file_statechange_bits[] = {
   0xfe, 0x01, 0x02, 0x03, 0x02, 0x05, 0x02, 0x09, 0x02, 0x1f, 0x62, 0x10,
   0x62, 0x10, 0xba, 0x11, 0xba, 0x11, 0x62, 0x10, 0x62, 0x10, 0x02, 0x10,
   0x02, 0x10, 0x02, 0x10, 0xfe, 0x1f};
} -maskdata $filemask

set ui_index .vpane.files.index.list
set ui_workdir .vpane.files.workdir.list

set all_icons(_$ui_index)   file_plain
set all_icons(A$ui_index)   file_fulltick
set all_icons(M$ui_index)   file_fulltick
set all_icons(D$ui_index)   file_removed
set all_icons(U$ui_index)   file_merge
set all_icons(T$ui_index)   file_statechange

set all_icons(_$ui_workdir) file_plain
set all_icons(M$ui_workdir) file_mod
set all_icons(D$ui_workdir) file_question
set all_icons(U$ui_workdir) file_merge
set all_icons(O$ui_workdir) file_plain
set all_icons(T$ui_workdir) file_statechange

set max_status_desc 0
foreach i {
		{__ {mc "Unmodified"}}

		{_M {mc "Modified, not staged"}}
		{M_ {mc "Staged for commit"}}
		{MM {mc "Portions staged for commit"}}
		{MD {mc "Staged for commit, missing"}}

		{_T {mc "File type changed, not staged"}}
		{T_ {mc "File type changed, staged"}}

		{_O {mc "Untracked, not staged"}}
		{A_ {mc "Staged for commit"}}
		{AM {mc "Portions staged for commit"}}
		{AD {mc "Staged for commit, missing"}}

		{_D {mc "Missing"}}
		{D_ {mc "Staged for removal"}}
		{DO {mc "Staged for removal, still present"}}

		{_U {mc "Requires merge resolution"}}
		{U_ {mc "Requires merge resolution"}}
		{UU {mc "Requires merge resolution"}}
		{UM {mc "Requires merge resolution"}}
		{UD {mc "Requires merge resolution"}}
		{UT {mc "Requires merge resolution"}}
	} {
	set text [eval [lindex $i 1]]
	if {$max_status_desc < [string length $text]} {
		set max_status_desc [string length $text]
	}
	set all_descs([lindex $i 0]) $text
}
unset i

######################################################################
##
## util

proc scrollbar2many {list mode args} {
	foreach w $list {eval $w $mode $args}
}

proc many2scrollbar {list mode sb top bottom} {
	$sb set $top $bottom
	foreach w $list {$w $mode moveto $top}
}

proc incr_font_size {font {amt 1}} {
	set sz [font configure $font -size]
	incr sz $amt
	font configure $font -size $sz
	font configure ${font}bold -size $sz
	font configure ${font}italic -size $sz
}

######################################################################
##
## ui commands

set starting_gitk_msg [mc "Starting gitk... please wait..."]

proc do_gitk {revs} {
	# -- Always start gitk through whatever we were loaded with.  This
	#    lets us bypass using shell process on Windows systems.
	#
	set exe [_which gitk -script]
	set cmd [list [info nameofexecutable] $exe]
	if {$exe eq {}} {
		error_popup [mc "Couldn't find gitk in PATH"]
	} else {
		global env

		if {[info exists env(GIT_DIR)]} {
			set old_GIT_DIR $env(GIT_DIR)
		} else {
			set old_GIT_DIR {}
		}

		set pwd [pwd]
		cd [file dirname [gitdir]]
		set env(GIT_DIR) [file tail [gitdir]]

		eval exec $cmd $revs &

		if {$old_GIT_DIR eq {}} {
			unset env(GIT_DIR)
		} else {
			set env(GIT_DIR) $old_GIT_DIR
		}
		cd $pwd

		ui_status $::starting_gitk_msg
		after 10000 {
			ui_ready $starting_gitk_msg
		}
	}
}

set is_quitting 0

proc do_quit {} {
	global ui_comm is_quitting repo_config commit_type
	global GITGUI_BCK_exists GITGUI_BCK_i
	global ui_comm_spell

	if {$is_quitting} return
	set is_quitting 1

	if {[winfo exists $ui_comm]} {
		# -- Stash our current commit buffer.
		#
		set save [gitdir GITGUI_MSG]
		if {$GITGUI_BCK_exists && ![$ui_comm edit modified]} {
			file rename -force [gitdir GITGUI_BCK] $save
			set GITGUI_BCK_exists 0
		} else {
			set msg [string trim [$ui_comm get 0.0 end]]
			regsub -all -line {[ \r\t]+$} $msg {} msg
			if {(![string match amend* $commit_type]
				|| [$ui_comm edit modified])
				&& $msg ne {}} {
				catch {
					set fd [open $save w]
					puts -nonewline $fd $msg
					close $fd
				}
			} else {
				catch {file delete $save}
			}
		}

		# -- Cancel our spellchecker if its running.
		#
		if {[info exists ui_comm_spell]} {
			$ui_comm_spell stop
		}

		# -- Remove our editor backup, its not needed.
		#
		after cancel $GITGUI_BCK_i
		if {$GITGUI_BCK_exists} {
			catch {file delete [gitdir GITGUI_BCK]}
		}

		# -- Stash our current window geometry into this repository.
		#
		set cfg_geometry [list]
		lappend cfg_geometry [wm geometry .]
		lappend cfg_geometry [lindex [.vpane sash coord 0] 0]
		lappend cfg_geometry [lindex [.vpane.files sash coord 0] 1]
		if {[catch {set rc_geometry $repo_config(gui.geometry)}]} {
			set rc_geometry {}
		}
		if {$cfg_geometry ne $rc_geometry} {
			catch {git config gui.geometry $cfg_geometry}
		}
	}

	destroy .
}

proc do_rescan {} {
	rescan ui_ready
}

proc do_commit {} {
	commit_tree
}

proc next_diff {} {
	global next_diff_p next_diff_w next_diff_i
	show_diff $next_diff_p $next_diff_w {}
}

proc find_anchor_pos {lst name} {
	set lid [lsearch -sorted -exact $lst $name]

	if {$lid == -1} {
		set lid 0
		foreach lname $lst {
			if {$lname >= $name} break
			incr lid
		}
	}

	return $lid
}

proc find_file_from {flist idx delta path mmask} {
	global file_states

	set len [llength $flist]
	while {$idx >= 0 && $idx < $len} {
		set name [lindex $flist $idx]

		if {$name ne $path && [info exists file_states($name)]} {
			set state [lindex $file_states($name) 0]

			if {$mmask eq {} || [regexp $mmask $state]} {
				return $idx
			}
		}

		incr idx $delta
	}

	return {}
}

proc find_next_diff {w path {lno {}} {mmask {}}} {
	global next_diff_p next_diff_w next_diff_i
	global file_lists ui_index ui_workdir

	set flist $file_lists($w)
	if {$lno eq {}} {
		set lno [find_anchor_pos $flist $path]
	} else {
		incr lno -1
	}

	if {$mmask ne {} && ![regexp {(^\^)|(\$$)} $mmask]} {
		if {$w eq $ui_index} {
			set mmask "^$mmask"
		} else {
			set mmask "$mmask\$"
		}
	}

	set idx [find_file_from $flist $lno 1 $path $mmask]
	if {$idx eq {}} {
		incr lno -1
		set idx [find_file_from $flist $lno -1 $path $mmask]
	}

	if {$idx ne {}} {
		set next_diff_w $w
		set next_diff_p [lindex $flist $idx]
		set next_diff_i [expr {$idx+1}]
		return 1
	} else {
		return 0
	}
}

proc next_diff_after_action {w path {lno {}} {mmask {}}} {
	global current_diff_path

	if {$path ne $current_diff_path} {
		return {}
	} elseif {[find_next_diff $w $path $lno $mmask]} {
		return {next_diff;}
	} else {
		return {reshow_diff;}
	}
}

proc select_first_diff {} {
	global ui_workdir

	if {[find_next_diff $ui_workdir {} 1 {^_?U}] ||
	    [find_next_diff $ui_workdir {} 1 {[^O]$}]} {
		next_diff
	}
}

proc toggle_or_diff {w x y} {
	global file_states file_lists current_diff_path ui_index ui_workdir
	global last_clicked selected_paths

	set pos [split [$w index @$x,$y] .]
	set lno [lindex $pos 0]
	set col [lindex $pos 1]
	set path [lindex $file_lists($w) [expr {$lno - 1}]]
	if {$path eq {}} {
		set last_clicked {}
		return
	}

	set last_clicked [list $w $lno]
	array unset selected_paths
	$ui_index tag remove in_sel 0.0 end
	$ui_workdir tag remove in_sel 0.0 end

	# Do not stage files with conflicts
	if {[info exists file_states($path)]} {
		set state [lindex $file_states($path) 0]
		if {[string first {U} $state] >= 0} {
			set col 1
		}
	}

	if {$col == 0 && $y > 1} {
		set after [next_diff_after_action $w $path $lno]

		if {$w eq $ui_index} {
			update_indexinfo \
				"Unstaging [short_path $path] from commit" \
				[list $path] \
				[concat $after [list ui_ready]]
		} elseif {$w eq $ui_workdir} {
			update_index \
				"Adding [short_path $path]" \
				[list $path] \
				[concat $after [list ui_ready]]
		}
	} else {
		show_diff $path $w $lno
	}
}

proc add_one_to_selection {w x y} {
	global file_lists last_clicked selected_paths

	set lno [lindex [split [$w index @$x,$y] .] 0]
	set path [lindex $file_lists($w) [expr {$lno - 1}]]
	if {$path eq {}} {
		set last_clicked {}
		return
	}

	if {$last_clicked ne {}
		&& [lindex $last_clicked 0] ne $w} {
		array unset selected_paths
		[lindex $last_clicked 0] tag remove in_sel 0.0 end
	}

	set last_clicked [list $w $lno]
	if {[catch {set in_sel $selected_paths($path)}]} {
		set in_sel 0
	}
	if {$in_sel} {
		unset selected_paths($path)
		$w tag remove in_sel $lno.0 [expr {$lno + 1}].0
	} else {
		set selected_paths($path) 1
		$w tag add in_sel $lno.0 [expr {$lno + 1}].0
	}
}

proc add_range_to_selection {w x y} {
	global file_lists last_clicked selected_paths

	if {[lindex $last_clicked 0] ne $w} {
		toggle_or_diff $w $x $y
		return
	}

	set lno [lindex [split [$w index @$x,$y] .] 0]
	set lc [lindex $last_clicked 1]
	if {$lc < $lno} {
		set begin $lc
		set end $lno
	} else {
		set begin $lno
		set end $lc
	}

	foreach path [lrange $file_lists($w) \
		[expr {$begin - 1}] \
		[expr {$end - 1}]] {
		set selected_paths($path) 1
	}
	$w tag add in_sel $begin.0 [expr {$end + 1}].0
}

proc show_more_context {} {
	global repo_config
	if {$repo_config(gui.diffcontext) < 99} {
		incr repo_config(gui.diffcontext)
		reshow_diff
	}
}

proc show_less_context {} {
	global repo_config
	if {$repo_config(gui.diffcontext) > 1} {
		incr repo_config(gui.diffcontext) -1
		reshow_diff
	}
}

######################################################################
##
## ui construction

load_config 0
apply_config
set ui_comm {}

# -- Menu Bar
#
menu .mbar -tearoff 0
.mbar add cascade -label [mc Repository] -menu .mbar.repository
.mbar add cascade -label [mc Edit] -menu .mbar.edit
if {[is_enabled branch]} {
	.mbar add cascade -label [mc Branch] -menu .mbar.branch
}
if {[is_enabled multicommit] || [is_enabled singlecommit]} {
	.mbar add cascade -label [mc Commit@@noun] -menu .mbar.commit
}
if {[is_enabled transport]} {
	.mbar add cascade -label [mc Merge] -menu .mbar.merge
	.mbar add cascade -label [mc Remote] -menu .mbar.remote
}
. configure -menu .mbar

# -- Repository Menu
#
menu .mbar.repository

.mbar.repository add command \
	-label [mc "Browse Current Branch's Files"] \
	-command {browser::new $current_branch}
set ui_browse_current [.mbar.repository index last]
.mbar.repository add command \
	-label [mc "Browse Branch Files..."] \
	-command browser_open::dialog
.mbar.repository add separator

.mbar.repository add command \
	-label [mc "Visualize Current Branch's History"] \
	-command {do_gitk $current_branch}
set ui_visualize_current [.mbar.repository index last]
.mbar.repository add command \
	-label [mc "Visualize All Branch History"] \
	-command {do_gitk --all}
.mbar.repository add separator

proc current_branch_write {args} {
	global current_branch
	.mbar.repository entryconf $::ui_browse_current \
		-label [mc "Browse %s's Files" $current_branch]
	.mbar.repository entryconf $::ui_visualize_current \
		-label [mc "Visualize %s's History" $current_branch]
}
trace add variable current_branch write current_branch_write

if {[is_enabled multicommit]} {
	.mbar.repository add command -label [mc "Database Statistics"] \
		-command do_stats

	.mbar.repository add command -label [mc "Compress Database"] \
		-command do_gc

	.mbar.repository add command -label [mc "Verify Database"] \
		-command do_fsck_objects

	.mbar.repository add separator

	if {[is_Cygwin]} {
		.mbar.repository add command \
			-label [mc "Create Desktop Icon"] \
			-command do_cygwin_shortcut
	} elseif {[is_Windows]} {
		.mbar.repository add command \
			-label [mc "Create Desktop Icon"] \
			-command do_windows_shortcut
	} elseif {[is_MacOSX]} {
		.mbar.repository add command \
			-label [mc "Create Desktop Icon"] \
			-command do_macosx_app
	}
}

if {[is_MacOSX]} {
	proc ::tk::mac::Quit {args} { do_quit }
} else {
	.mbar.repository add command -label [mc Quit] \
		-command do_quit \
		-accelerator $M1T-Q
}

# -- Edit Menu
#
menu .mbar.edit
.mbar.edit add command -label [mc Undo] \
	-command {catch {[focus] edit undo}} \
	-accelerator $M1T-Z
.mbar.edit add command -label [mc Redo] \
	-command {catch {[focus] edit redo}} \
	-accelerator $M1T-Y
.mbar.edit add separator
.mbar.edit add command -label [mc Cut] \
	-command {catch {tk_textCut [focus]}} \
	-accelerator $M1T-X
.mbar.edit add command -label [mc Copy] \
	-command {catch {tk_textCopy [focus]}} \
	-accelerator $M1T-C
.mbar.edit add command -label [mc Paste] \
	-command {catch {tk_textPaste [focus]; [focus] see insert}} \
	-accelerator $M1T-V
.mbar.edit add command -label [mc Delete] \
	-command {catch {[focus] delete sel.first sel.last}} \
	-accelerator Del
.mbar.edit add separator
.mbar.edit add command -label [mc "Select All"] \
	-command {catch {[focus] tag add sel 0.0 end}} \
	-accelerator $M1T-A

# -- Branch Menu
#
if {[is_enabled branch]} {
	menu .mbar.branch

	.mbar.branch add command -label [mc "Create..."] \
		-command branch_create::dialog \
		-accelerator $M1T-N
	lappend disable_on_lock [list .mbar.branch entryconf \
		[.mbar.branch index last] -state]

	.mbar.branch add command -label [mc "Checkout..."] \
		-command branch_checkout::dialog \
		-accelerator $M1T-O
	lappend disable_on_lock [list .mbar.branch entryconf \
		[.mbar.branch index last] -state]

	.mbar.branch add command -label [mc "Rename..."] \
		-command branch_rename::dialog
	lappend disable_on_lock [list .mbar.branch entryconf \
		[.mbar.branch index last] -state]

	.mbar.branch add command -label [mc "Delete..."] \
		-command branch_delete::dialog
	lappend disable_on_lock [list .mbar.branch entryconf \
		[.mbar.branch index last] -state]

	.mbar.branch add command -label [mc "Reset..."] \
		-command merge::reset_hard
	lappend disable_on_lock [list .mbar.branch entryconf \
		[.mbar.branch index last] -state]
}

# -- Commit Menu
#
if {[is_enabled multicommit] || [is_enabled singlecommit]} {
	menu .mbar.commit

	.mbar.commit add radiobutton \
		-label [mc "New Commit"] \
		-command do_select_commit_type \
		-variable selected_commit_type \
		-value new
	lappend disable_on_lock \
		[list .mbar.commit entryconf [.mbar.commit index last] -state]

	.mbar.commit add radiobutton \
		-label [mc "Amend Last Commit"] \
		-command do_select_commit_type \
		-variable selected_commit_type \
		-value amend
	lappend disable_on_lock \
		[list .mbar.commit entryconf [.mbar.commit index last] -state]

	.mbar.commit add separator

	.mbar.commit add command -label [mc Rescan] \
		-command do_rescan \
		-accelerator F5
	lappend disable_on_lock \
		[list .mbar.commit entryconf [.mbar.commit index last] -state]

	.mbar.commit add command -label [mc "Stage To Commit"] \
		-command do_add_selection \
		-accelerator $M1T-T
	lappend disable_on_lock \
		[list .mbar.commit entryconf [.mbar.commit index last] -state]

	.mbar.commit add command -label [mc "Stage Changed Files To Commit"] \
		-command do_add_all \
		-accelerator $M1T-I
	lappend disable_on_lock \
		[list .mbar.commit entryconf [.mbar.commit index last] -state]

	.mbar.commit add command -label [mc "Unstage From Commit"] \
		-command do_unstage_selection
	lappend disable_on_lock \
		[list .mbar.commit entryconf [.mbar.commit index last] -state]

	.mbar.commit add command -label [mc "Revert Changes"] \
		-command do_revert_selection
	lappend disable_on_lock \
		[list .mbar.commit entryconf [.mbar.commit index last] -state]

	.mbar.commit add separator

	.mbar.commit add command -label [mc "Show Less Context"] \
		-command show_less_context \
		-accelerator $M1T-\-

	.mbar.commit add command -label [mc "Show More Context"] \
		-command show_more_context \
		-accelerator $M1T-=

	.mbar.commit add separator

	.mbar.commit add command -label [mc "Sign Off"] \
		-command do_signoff \
		-accelerator $M1T-S

	.mbar.commit add command -label [mc Commit@@verb] \
		-command do_commit \
		-accelerator $M1T-Return
	lappend disable_on_lock \
		[list .mbar.commit entryconf [.mbar.commit index last] -state]
}

# -- Merge Menu
#
if {[is_enabled branch]} {
	menu .mbar.merge
	.mbar.merge add command -label [mc "Local Merge..."] \
		-command merge::dialog \
		-accelerator $M1T-M
	lappend disable_on_lock \
		[list .mbar.merge entryconf [.mbar.merge index last] -state]
	.mbar.merge add command -label [mc "Abort Merge..."] \
		-command merge::reset_hard
	lappend disable_on_lock \
		[list .mbar.merge entryconf [.mbar.merge index last] -state]
}

# -- Transport Menu
#
if {[is_enabled transport]} {
	menu .mbar.remote

	.mbar.remote add command \
		-label [mc "Push..."] \
		-command do_push_anywhere \
		-accelerator $M1T-P
	.mbar.remote add command \
		-label [mc "Delete..."] \
		-command remote_branch_delete::dialog
}

if {[is_MacOSX]} {
	# -- Apple Menu (Mac OS X only)
	#
	.mbar add cascade -label Apple -menu .mbar.apple
	menu .mbar.apple

	.mbar.apple add command -label [mc "About %s" [appname]] \
		-command do_about
	.mbar.apple add separator
	.mbar.apple add command \
		-label [mc "Preferences..."] \
		-command do_options \
		-accelerator $M1T-,
	bind . <$M1B-,> do_options
} else {
	# -- Edit Menu
	#
	.mbar.edit add separator
	.mbar.edit add command -label [mc "Options..."] \
		-command do_options
}

# -- Help Menu
#
.mbar add cascade -label [mc Help] -menu .mbar.help
menu .mbar.help

if {![is_MacOSX]} {
	.mbar.help add command -label [mc "About %s" [appname]] \
		-command do_about
}

set browser {}
catch {set browser $repo_config(instaweb.browser)}
set doc_path [file dirname [gitexec]]
set doc_path [file join $doc_path Documentation index.html]

if {[is_Cygwin]} {
	set doc_path [exec cygpath --mixed $doc_path]
}

if {$browser eq {}} {
	if {[is_MacOSX]} {
		set browser open
	} elseif {[is_Cygwin]} {
		set program_files [file dirname [exec cygpath --windir]]
		set program_files [file join $program_files {Program Files}]
		set firefox [file join $program_files {Mozilla Firefox} firefox.exe]
		set ie [file join $program_files {Internet Explorer} IEXPLORE.EXE]
		if {[file exists $firefox]} {
			set browser $firefox
		} elseif {[file exists $ie]} {
			set browser $ie
		}
		unset program_files firefox ie
	}
}

if {[file isfile $doc_path]} {
	set doc_url "file:$doc_path"
} else {
	set doc_url {http://www.kernel.org/pub/software/scm/git/docs/}
}

if {$browser ne {}} {
	.mbar.help add command -label [mc "Online Documentation"] \
		-command [list exec $browser $doc_url &]
}
unset browser doc_path doc_url

# -- Standard bindings
#
wm protocol . WM_DELETE_WINDOW do_quit
bind all <$M1B-Key-q> do_quit
bind all <$M1B-Key-Q> do_quit
bind all <$M1B-Key-w> {destroy [winfo toplevel %W]}
bind all <$M1B-Key-W> {destroy [winfo toplevel %W]}

set subcommand_args {}
proc usage {} {
	puts stderr "usage: $::argv0 $::subcommand $::subcommand_args"
	exit 1
}

# -- Not a normal commit type invocation?  Do that instead!
#
switch -- $subcommand {
browser -
blame {
	if {$subcommand eq "blame"} {
		set subcommand_args {[--line=<num>] rev? path}
	} else {
		set subcommand_args {rev? path}
	}
	if {$argv eq {}} usage
	set head {}
	set path {}
	set jump_spec {}
	set is_path 0
	foreach a $argv {
		if {$is_path || [file exists $_prefix$a]} {
			if {$path ne {}} usage
			set path $_prefix$a
			break
		} elseif {$a eq {--}} {
			if {$path ne {}} {
				if {$head ne {}} usage
				set head $path
				set path {}
			}
			set is_path 1
		} elseif {[regexp {^--line=(\d+)$} $a a lnum]} {
			if {$jump_spec ne {} || $head ne {}} usage
			set jump_spec [list $lnum]
		} elseif {$head eq {}} {
			if {$head ne {}} usage
			set head $a
			set is_path 1
		} else {
			usage
		}
	}
	unset is_path

	if {$head ne {} && $path eq {}} {
		set path $_prefix$head
		set head {}
	}

	if {$head eq {}} {
		load_current_branch
	} else {
		if {[regexp {^[0-9a-f]{1,39}$} $head]} {
			if {[catch {
					set head [git rev-parse --verify $head]
				} err]} {
				puts stderr $err
				exit 1
			}
		}
		set current_branch $head
	}

	switch -- $subcommand {
	browser {
		if {$jump_spec ne {}} usage
		if {$head eq {}} {
			if {$path ne {} && [file isdirectory $path]} {
				set head $current_branch
			} else {
				set head $path
				set path {}
			}
		}
		browser::new $head $path
	}
	blame   {
		if {$head eq {} && ![file exists $path]} {
			puts stderr [mc "fatal: cannot stat path %s: No such file or directory" $path]
			exit 1
		}
		blame::new $head $path $jump_spec
	}
	}
	return
}
citool -
gui {
	if {[llength $argv] != 0} {
		puts -nonewline stderr "usage: $argv0"
		if {$subcommand ne {gui}
			&& [file tail $argv0] ne "git-$subcommand"} {
			puts -nonewline stderr " $subcommand"
		}
		puts stderr {}
		exit 1
	}
	# fall through to setup UI for commits
}
default {
	puts stderr "usage: $argv0 \[{blame|browser|citool}\]"
	exit 1
}
}

# -- Branch Control
#
frame .branch \
	-borderwidth 1 \
	-relief sunken
label .branch.l1 \
	-text [mc "Current Branch:"] \
	-anchor w \
	-justify left
label .branch.cb \
	-textvariable current_branch \
	-anchor w \
	-justify left
pack .branch.l1 -side left
pack .branch.cb -side left -fill x
pack .branch -side top -fill x

# -- Main Window Layout
#
panedwindow .vpane -orient horizontal
panedwindow .vpane.files -orient vertical
.vpane add .vpane.files -sticky nsew -height 100 -width 200
pack .vpane -anchor n -side top -fill both -expand 1

# -- Index File List
#
frame .vpane.files.index -height 100 -width 200
label .vpane.files.index.title -text [mc "Staged Changes (Will Commit)"] \
	-background lightgreen -foreground black
text $ui_index -background white -foreground black \
	-borderwidth 0 \
	-width 20 -height 10 \
	-wrap none \
	-cursor $cursor_ptr \
	-xscrollcommand {.vpane.files.index.sx set} \
	-yscrollcommand {.vpane.files.index.sy set} \
	-state disabled
scrollbar .vpane.files.index.sx -orient h -command [list $ui_index xview]
scrollbar .vpane.files.index.sy -orient v -command [list $ui_index yview]
pack .vpane.files.index.title -side top -fill x
pack .vpane.files.index.sx -side bottom -fill x
pack .vpane.files.index.sy -side right -fill y
pack $ui_index -side left -fill both -expand 1

# -- Working Directory File List
#
frame .vpane.files.workdir -height 100 -width 200
label .vpane.files.workdir.title -text [mc "Unstaged Changes"] \
	-background lightsalmon -foreground black
text $ui_workdir -background white -foreground black \
	-borderwidth 0 \
	-width 20 -height 10 \
	-wrap none \
	-cursor $cursor_ptr \
	-xscrollcommand {.vpane.files.workdir.sx set} \
	-yscrollcommand {.vpane.files.workdir.sy set} \
	-state disabled
scrollbar .vpane.files.workdir.sx -orient h -command [list $ui_workdir xview]
scrollbar .vpane.files.workdir.sy -orient v -command [list $ui_workdir yview]
pack .vpane.files.workdir.title -side top -fill x
pack .vpane.files.workdir.sx -side bottom -fill x
pack .vpane.files.workdir.sy -side right -fill y
pack $ui_workdir -side left -fill both -expand 1

.vpane.files add .vpane.files.workdir -sticky nsew
.vpane.files add .vpane.files.index -sticky nsew

foreach i [list $ui_index $ui_workdir] {
	rmsel_tag $i
	$i tag conf in_diff -background [$i tag cget in_sel -background]
}
unset i

# -- Diff and Commit Area
#
frame .vpane.lower -height 300 -width 400
frame .vpane.lower.commarea
frame .vpane.lower.diff -relief sunken -borderwidth 1
pack .vpane.lower.diff -fill both -expand 1
pack .vpane.lower.commarea -side bottom -fill x
.vpane add .vpane.lower -sticky nsew

# -- Commit Area Buttons
#
frame .vpane.lower.commarea.buttons
label .vpane.lower.commarea.buttons.l -text {} \
	-anchor w \
	-justify left
pack .vpane.lower.commarea.buttons.l -side top -fill x
pack .vpane.lower.commarea.buttons -side left -fill y

button .vpane.lower.commarea.buttons.rescan -text [mc Rescan] \
	-command do_rescan
pack .vpane.lower.commarea.buttons.rescan -side top -fill x
lappend disable_on_lock \
	{.vpane.lower.commarea.buttons.rescan conf -state}

button .vpane.lower.commarea.buttons.incall -text [mc "Stage Changed"] \
	-command do_add_all
pack .vpane.lower.commarea.buttons.incall -side top -fill x
lappend disable_on_lock \
	{.vpane.lower.commarea.buttons.incall conf -state}

button .vpane.lower.commarea.buttons.signoff -text [mc "Sign Off"] \
	-command do_signoff
pack .vpane.lower.commarea.buttons.signoff -side top -fill x

button .vpane.lower.commarea.buttons.commit -text [mc Commit@@verb] \
	-command do_commit
pack .vpane.lower.commarea.buttons.commit -side top -fill x
lappend disable_on_lock \
	{.vpane.lower.commarea.buttons.commit conf -state}

button .vpane.lower.commarea.buttons.push -text [mc Push] \
	-command do_push_anywhere
pack .vpane.lower.commarea.buttons.push -side top -fill x

# -- Commit Message Buffer
#
frame .vpane.lower.commarea.buffer
frame .vpane.lower.commarea.buffer.header
set ui_comm .vpane.lower.commarea.buffer.t
set ui_coml .vpane.lower.commarea.buffer.header.l
radiobutton .vpane.lower.commarea.buffer.header.new \
	-text [mc "New Commit"] \
	-command do_select_commit_type \
	-variable selected_commit_type \
	-value new
lappend disable_on_lock \
	[list .vpane.lower.commarea.buffer.header.new conf -state]
radiobutton .vpane.lower.commarea.buffer.header.amend \
	-text [mc "Amend Last Commit"] \
	-command do_select_commit_type \
	-variable selected_commit_type \
	-value amend
lappend disable_on_lock \
	[list .vpane.lower.commarea.buffer.header.amend conf -state]
label $ui_coml \
	-anchor w \
	-justify left
proc trace_commit_type {varname args} {
	global ui_coml commit_type
	switch -glob -- $commit_type {
	initial       {set txt [mc "Initial Commit Message:"]}
	amend         {set txt [mc "Amended Commit Message:"]}
	amend-initial {set txt [mc "Amended Initial Commit Message:"]}
	amend-merge   {set txt [mc "Amended Merge Commit Message:"]}
	merge         {set txt [mc "Merge Commit Message:"]}
	*             {set txt [mc "Commit Message:"]}
	}
	$ui_coml conf -text $txt
}
trace add variable commit_type write trace_commit_type
pack $ui_coml -side left -fill x
pack .vpane.lower.commarea.buffer.header.amend -side right
pack .vpane.lower.commarea.buffer.header.new -side right

text $ui_comm -background white -foreground black \
	-borderwidth 1 \
	-undo true \
	-maxundo 20 \
	-autoseparators true \
	-relief sunken \
	-width $repo_config(gui.commitmsgwidth) -height 9 -wrap none \
	-font font_diff \
	-yscrollcommand {.vpane.lower.commarea.buffer.sby set}
scrollbar .vpane.lower.commarea.buffer.sby \
	-command [list $ui_comm yview]
pack .vpane.lower.commarea.buffer.header -side top -fill x
pack .vpane.lower.commarea.buffer.sby -side right -fill y
pack $ui_comm -side left -fill y
pack .vpane.lower.commarea.buffer -side left -fill y

# -- Commit Message Buffer Context Menu
#
set ctxm .vpane.lower.commarea.buffer.ctxm
menu $ctxm -tearoff 0
$ctxm add command \
	-label [mc Cut] \
	-command {tk_textCut $ui_comm}
$ctxm add command \
	-label [mc Copy] \
	-command {tk_textCopy $ui_comm}
$ctxm add command \
	-label [mc Paste] \
	-command {tk_textPaste $ui_comm}
$ctxm add command \
	-label [mc Delete] \
	-command {$ui_comm delete sel.first sel.last}
$ctxm add separator
$ctxm add command \
	-label [mc "Select All"] \
	-command {focus $ui_comm;$ui_comm tag add sel 0.0 end}
$ctxm add command \
	-label [mc "Copy All"] \
	-command {
		$ui_comm tag add sel 0.0 end
		tk_textCopy $ui_comm
		$ui_comm tag remove sel 0.0 end
	}
$ctxm add separator
$ctxm add command \
	-label [mc "Sign Off"] \
	-command do_signoff
set ui_comm_ctxm $ctxm

# -- Diff Header
#
proc trace_current_diff_path {varname args} {
	global current_diff_path diff_actions file_states
	if {$current_diff_path eq {}} {
		set s {}
		set f {}
		set p {}
		set o disabled
	} else {
		set p $current_diff_path
		set s [mapdesc [lindex $file_states($p) 0] $p]
		set f [mc "File:"]
		set p [escape_path $p]
		set o normal
	}

	.vpane.lower.diff.header.status configure -text $s
	.vpane.lower.diff.header.file configure -text $f
	.vpane.lower.diff.header.path configure -text $p
	foreach w $diff_actions {
		uplevel #0 $w $o
	}
}
trace add variable current_diff_path write trace_current_diff_path

frame .vpane.lower.diff.header -background gold
label .vpane.lower.diff.header.status \
	-background gold \
	-foreground black \
	-width $max_status_desc \
	-anchor w \
	-justify left
label .vpane.lower.diff.header.file \
	-background gold \
	-foreground black \
	-anchor w \
	-justify left
label .vpane.lower.diff.header.path \
	-background gold \
	-foreground black \
	-anchor w \
	-justify left
pack .vpane.lower.diff.header.status -side left
pack .vpane.lower.diff.header.file -side left
pack .vpane.lower.diff.header.path -fill x
set ctxm .vpane.lower.diff.header.ctxm
menu $ctxm -tearoff 0
$ctxm add command \
	-label [mc Copy] \
	-command {
		clipboard clear
		clipboard append \
			-format STRING \
			-type STRING \
			-- $current_diff_path
	}
lappend diff_actions [list $ctxm entryconf [$ctxm index last] -state]
bind_button3 .vpane.lower.diff.header.path "tk_popup $ctxm %X %Y"

# -- Diff Body
#
frame .vpane.lower.diff.body
set ui_diff .vpane.lower.diff.body.t
text $ui_diff -background white -foreground black \
	-borderwidth 0 \
	-width 80 -height 15 -wrap none \
	-font font_diff \
	-xscrollcommand {.vpane.lower.diff.body.sbx set} \
	-yscrollcommand {.vpane.lower.diff.body.sby set} \
	-state disabled
scrollbar .vpane.lower.diff.body.sbx -orient horizontal \
	-command [list $ui_diff xview]
scrollbar .vpane.lower.diff.body.sby -orient vertical \
	-command [list $ui_diff yview]
pack .vpane.lower.diff.body.sbx -side bottom -fill x
pack .vpane.lower.diff.body.sby -side right -fill y
pack $ui_diff -side left -fill both -expand 1
pack .vpane.lower.diff.header -side top -fill x
pack .vpane.lower.diff.body -side bottom -fill both -expand 1

$ui_diff tag conf d_cr -elide true
$ui_diff tag conf d_@ -foreground blue -font font_diffbold
$ui_diff tag conf d_+ -foreground {#00a000}
$ui_diff tag conf d_- -foreground red

$ui_diff tag conf d_++ -foreground {#00a000}
$ui_diff tag conf d_-- -foreground red
$ui_diff tag conf d_+s \
	-foreground {#00a000} \
	-background {#e2effa}
$ui_diff tag conf d_-s \
	-foreground red \
	-background {#e2effa}
$ui_diff tag conf d_s+ \
	-foreground {#00a000} \
	-background ivory1
$ui_diff tag conf d_s- \
	-foreground red \
	-background ivory1

$ui_diff tag conf d<<<<<<< \
	-foreground orange \
	-font font_diffbold
$ui_diff tag conf d======= \
	-foreground orange \
	-font font_diffbold
$ui_diff tag conf d>>>>>>> \
	-foreground orange \
	-font font_diffbold

$ui_diff tag raise sel

# -- Diff Body Context Menu
#

proc create_common_diff_popup {ctxm} {
	$ctxm add command \
		-label [mc "Show Less Context"] \
		-command show_less_context
	lappend diff_actions [list $ctxm entryconf [$ctxm index last] -state]
	$ctxm add command \
		-label [mc "Show More Context"] \
		-command show_more_context
	lappend diff_actions [list $ctxm entryconf [$ctxm index last] -state]
	$ctxm add separator
	$ctxm add command \
		-label [mc Refresh] \
		-command reshow_diff
	lappend diff_actions [list $ctxm entryconf [$ctxm index last] -state]
	$ctxm add command \
		-label [mc Copy] \
		-command {tk_textCopy $ui_diff}
	lappend diff_actions [list $ctxm entryconf [$ctxm index last] -state]
	$ctxm add command \
		-label [mc "Select All"] \
		-command {focus $ui_diff;$ui_diff tag add sel 0.0 end}
	lappend diff_actions [list $ctxm entryconf [$ctxm index last] -state]
	$ctxm add command \
		-label [mc "Copy All"] \
		-command {
			$ui_diff tag add sel 0.0 end
			tk_textCopy $ui_diff
			$ui_diff tag remove sel 0.0 end
		}
	lappend diff_actions [list $ctxm entryconf [$ctxm index last] -state]
	$ctxm add separator
	$ctxm add command \
		-label [mc "Decrease Font Size"] \
		-command {incr_font_size font_diff -1}
	lappend diff_actions [list $ctxm entryconf [$ctxm index last] -state]
	$ctxm add command \
		-label [mc "Increase Font Size"] \
		-command {incr_font_size font_diff 1}
	lappend diff_actions [list $ctxm entryconf [$ctxm index last] -state]
	$ctxm add separator
	$ctxm add command -label [mc "Options..."] \
		-command do_options
}

set ctxm .vpane.lower.diff.body.ctxm
menu $ctxm -tearoff 0
$ctxm add command \
	-label [mc "Apply/Reverse Hunk"] \
	-command {apply_hunk $cursorX $cursorY}
set ui_diff_applyhunk [$ctxm index last]
lappend diff_actions [list $ctxm entryconf $ui_diff_applyhunk -state]
$ctxm add command \
	-label [mc "Apply/Reverse Line"] \
	-command {apply_line $cursorX $cursorY; do_rescan}
set ui_diff_applyline [$ctxm index last]
lappend diff_actions [list $ctxm entryconf $ui_diff_applyline -state]
$ctxm add separator
create_common_diff_popup $ctxm

set ctxmmg .vpane.lower.diff.body.ctxmmg
menu $ctxmmg -tearoff 0
$ctxmmg add command \
	-label [mc "Run Merge Tool"] \
	-command {merge_resolve_tool}
lappend diff_actions [list $ctxmmg entryconf [$ctxmmg index last] -state]
$ctxmmg add separator
$ctxmmg add command \
	-label [mc "Use Remote Version"] \
	-command {merge_resolve_one 3}
lappend diff_actions [list $ctxmmg entryconf [$ctxmmg index last] -state]
$ctxmmg add command \
	-label [mc "Use Local Version"] \
	-command {merge_resolve_one 2}
lappend diff_actions [list $ctxmmg entryconf [$ctxmmg index last] -state]
$ctxmmg add command \
	-label [mc "Revert To Base"] \
	-command {merge_resolve_one 1}
lappend diff_actions [list $ctxmmg entryconf [$ctxmmg index last] -state]
$ctxmmg add separator
create_common_diff_popup $ctxmmg

proc popup_diff_menu {ctxm ctxmmg x y X Y} {
	global current_diff_path file_states
	set ::cursorX $x
	set ::cursorY $y
	if {[info exists file_states($current_diff_path)]} {
		set state [lindex $file_states($current_diff_path) 0]
	} else {
		set state {__}
	}
	if {[string first {U} $state] >= 0} {
		tk_popup $ctxmmg $X $Y
	} else {
		if {$::ui_index eq $::current_diff_side} {
			set l [mc "Unstage Hunk From Commit"]
			set t [mc "Unstage Line From Commit"]
		} else {
			set l [mc "Stage Hunk For Commit"]
			set t [mc "Stage Line For Commit"]
		}
		if {$::is_3way_diff
			|| $current_diff_path eq {}
			|| {__} eq $state
			|| {_O} eq $state
			|| {_T} eq $state
			|| {T_} eq $state} {
			set s disabled
		} else {
			set s normal
		}
		$ctxm entryconf $::ui_diff_applyhunk -state $s -label $l
		$ctxm entryconf $::ui_diff_applyline -state $s -label $t
		tk_popup $ctxm $X $Y
	}
}
bind_button3 $ui_diff [list popup_diff_menu $ctxm $ctxmmg %x %y %X %Y]

# -- Status Bar
#
set main_status [::status_bar::new .status]
pack .status -anchor w -side bottom -fill x
$main_status show [mc "Initializing..."]

# -- Load geometry
#
catch {
set gm $repo_config(gui.geometry)
wm geometry . [lindex $gm 0]
.vpane sash place 0 \
	[lindex $gm 1] \
	[lindex [.vpane sash coord 0] 1]
.vpane.files sash place 0 \
	[lindex [.vpane.files sash coord 0] 0] \
	[lindex $gm 2]
unset gm
}

# -- Key Bindings
#
bind $ui_comm <$M1B-Key-Return> {do_commit;break}
bind $ui_comm <$M1B-Key-t> {do_add_selection;break}
bind $ui_comm <$M1B-Key-T> {do_add_selection;break}
bind $ui_comm <$M1B-Key-i> {do_add_all;break}
bind $ui_comm <$M1B-Key-I> {do_add_all;break}
bind $ui_comm <$M1B-Key-x> {tk_textCut %W;break}
bind $ui_comm <$M1B-Key-X> {tk_textCut %W;break}
bind $ui_comm <$M1B-Key-c> {tk_textCopy %W;break}
bind $ui_comm <$M1B-Key-C> {tk_textCopy %W;break}
bind $ui_comm <$M1B-Key-v> {tk_textPaste %W; %W see insert; break}
bind $ui_comm <$M1B-Key-V> {tk_textPaste %W; %W see insert; break}
bind $ui_comm <$M1B-Key-a> {%W tag add sel 0.0 end;break}
bind $ui_comm <$M1B-Key-A> {%W tag add sel 0.0 end;break}
bind $ui_comm <$M1B-Key-minus> {show_less_context;break}
bind $ui_comm <$M1B-Key-KP_Subtract> {show_less_context;break}
bind $ui_comm <$M1B-Key-equal> {show_more_context;break}
bind $ui_comm <$M1B-Key-plus> {show_more_context;break}
bind $ui_comm <$M1B-Key-KP_Add> {show_more_context;break}

bind $ui_diff <$M1B-Key-x> {tk_textCopy %W;break}
bind $ui_diff <$M1B-Key-X> {tk_textCopy %W;break}
bind $ui_diff <$M1B-Key-c> {tk_textCopy %W;break}
bind $ui_diff <$M1B-Key-C> {tk_textCopy %W;break}
bind $ui_diff <$M1B-Key-v> {break}
bind $ui_diff <$M1B-Key-V> {break}
bind $ui_diff <$M1B-Key-a> {%W tag add sel 0.0 end;break}
bind $ui_diff <$M1B-Key-A> {%W tag add sel 0.0 end;break}
bind $ui_diff <Key-Up>     {catch {%W yview scroll -1 units};break}
bind $ui_diff <Key-Down>   {catch {%W yview scroll  1 units};break}
bind $ui_diff <Key-Left>   {catch {%W xview scroll -1 units};break}
bind $ui_diff <Key-Right>  {catch {%W xview scroll  1 units};break}
bind $ui_diff <Key-k>         {catch {%W yview scroll -1 units};break}
bind $ui_diff <Key-j>         {catch {%W yview scroll  1 units};break}
bind $ui_diff <Key-h>         {catch {%W xview scroll -1 units};break}
bind $ui_diff <Key-l>         {catch {%W xview scroll  1 units};break}
bind $ui_diff <Control-Key-b> {catch {%W yview scroll -1 pages};break}
bind $ui_diff <Control-Key-f> {catch {%W yview scroll  1 pages};break}
bind $ui_diff <Button-1>   {focus %W}

if {[is_enabled branch]} {
	bind . <$M1B-Key-n> branch_create::dialog
	bind . <$M1B-Key-N> branch_create::dialog
	bind . <$M1B-Key-o> branch_checkout::dialog
	bind . <$M1B-Key-O> branch_checkout::dialog
	bind . <$M1B-Key-m> merge::dialog
	bind . <$M1B-Key-M> merge::dialog
}
if {[is_enabled transport]} {
	bind . <$M1B-Key-p> do_push_anywhere
	bind . <$M1B-Key-P> do_push_anywhere
}

bind .   <Key-F5>     do_rescan
bind .   <$M1B-Key-r> do_rescan
bind .   <$M1B-Key-R> do_rescan
bind .   <$M1B-Key-s> do_signoff
bind .   <$M1B-Key-S> do_signoff
bind .   <$M1B-Key-t> do_add_selection
bind .   <$M1B-Key-T> do_add_selection
bind .   <$M1B-Key-i> do_add_all
bind .   <$M1B-Key-I> do_add_all
bind .   <$M1B-Key-minus> {show_less_context;break}
bind .   <$M1B-Key-KP_Subtract> {show_less_context;break}
bind .   <$M1B-Key-equal> {show_more_context;break}
bind .   <$M1B-Key-plus> {show_more_context;break}
bind .   <$M1B-Key-KP_Add> {show_more_context;break}
bind .   <$M1B-Key-Return> do_commit
foreach i [list $ui_index $ui_workdir] {
	bind $i <Button-1>       "toggle_or_diff         $i %x %y; break"
	bind $i <$M1B-Button-1>  "add_one_to_selection   $i %x %y; break"
	bind $i <Shift-Button-1> "add_range_to_selection $i %x %y; break"
}
unset i

set file_lists($ui_index) [list]
set file_lists($ui_workdir) [list]

wm title . "[appname] ([reponame]) [file normalize [file dirname [gitdir]]]"
focus -force $ui_comm

# -- Warn the user about environmental problems.  Cygwin's Tcl
#    does *not* pass its env array onto any processes it spawns.
#    This means that git processes get none of our environment.
#
if {[is_Cygwin]} {
	set ignored_env 0
	set suggest_user {}
	set msg [mc "Possible environment issues exist.

The following environment variables are probably
going to be ignored by any Git subprocess run
by %s:

" [appname]]
	foreach name [array names env] {
		switch -regexp -- $name {
		{^GIT_INDEX_FILE$} -
		{^GIT_OBJECT_DIRECTORY$} -
		{^GIT_ALTERNATE_OBJECT_DIRECTORIES$} -
		{^GIT_DIFF_OPTS$} -
		{^GIT_EXTERNAL_DIFF$} -
		{^GIT_PAGER$} -
		{^GIT_TRACE$} -
		{^GIT_CONFIG$} -
		{^GIT_CONFIG_LOCAL$} -
		{^GIT_(AUTHOR|COMMITTER)_DATE$} {
			append msg " - $name\n"
			incr ignored_env
		}
		{^GIT_(AUTHOR|COMMITTER)_(NAME|EMAIL)$} {
			append msg " - $name\n"
			incr ignored_env
			set suggest_user $name
		}
		}
	}
	if {$ignored_env > 0} {
		append msg [mc "
This is due to a known issue with the
Tcl binary distributed by Cygwin."]

		if {$suggest_user ne {}} {
			append msg [mc "

A good replacement for %s
is placing values for the user.name and
user.email settings into your personal
~/.gitconfig file.
" $suggest_user]
		}
		warn_popup $msg
	}
	unset ignored_env msg suggest_user name
}

# -- Only initialize complex UI if we are going to stay running.
#
if {[is_enabled transport]} {
	load_all_remotes

	set n [.mbar.remote index end]
	populate_push_menu
	populate_fetch_menu
	set n [expr {[.mbar.remote index end] - $n}]
	if {$n > 0} {
		if {[.mbar.remote type 0] eq "tearoff"} { incr n }
		.mbar.remote insert $n separator
	}
	unset n
}

if {[winfo exists $ui_comm]} {
	set GITGUI_BCK_exists [load_message GITGUI_BCK]

	# -- If both our backup and message files exist use the
	#    newer of the two files to initialize the buffer.
	#
	if {$GITGUI_BCK_exists} {
		set m [gitdir GITGUI_MSG]
		if {[file isfile $m]} {
			if {[file mtime [gitdir GITGUI_BCK]] > [file mtime $m]} {
				catch {file delete [gitdir GITGUI_MSG]}
			} else {
				$ui_comm delete 0.0 end
				$ui_comm edit reset
				$ui_comm edit modified false
				catch {file delete [gitdir GITGUI_BCK]}
				set GITGUI_BCK_exists 0
			}
		}
		unset m
	}

	proc backup_commit_buffer {} {
		global ui_comm GITGUI_BCK_exists

		set m [$ui_comm edit modified]
		if {$m || $GITGUI_BCK_exists} {
			set msg [string trim [$ui_comm get 0.0 end]]
			regsub -all -line {[ \r\t]+$} $msg {} msg

			if {$msg eq {}} {
				if {$GITGUI_BCK_exists} {
					catch {file delete [gitdir GITGUI_BCK]}
					set GITGUI_BCK_exists 0
				}
			} elseif {$m} {
				catch {
					set fd [open [gitdir GITGUI_BCK] w]
					puts -nonewline $fd $msg
					close $fd
					set GITGUI_BCK_exists 1
				}
			}

			$ui_comm edit modified false
		}

		set ::GITGUI_BCK_i [after 2000 backup_commit_buffer]
	}

	backup_commit_buffer

	# -- If the user has aspell available we can drive it
	#    in pipe mode to spellcheck the commit message.
	#
	set spell_cmd [list |]
	set spell_dict [get_config gui.spellingdictionary]
	lappend spell_cmd aspell
	if {$spell_dict ne {}} {
		lappend spell_cmd --master=$spell_dict
	}
	lappend spell_cmd --mode=none
	lappend spell_cmd --encoding=utf-8
	lappend spell_cmd pipe
	if {$spell_dict eq {none}
	 || [catch {set spell_fd [open $spell_cmd r+]} spell_err]} {
		bind_button3 $ui_comm [list tk_popup $ui_comm_ctxm %X %Y]
	} else {
		set ui_comm_spell [spellcheck::init \
			$spell_fd \
			$ui_comm \
			$ui_comm_ctxm \
		]
	}
	unset -nocomplain spell_cmd spell_fd spell_err spell_dict
}

lock_index begin-read
if {![winfo ismapped .]} {
	wm deiconify .
}
after 1 do_rescan
if {[is_enabled multicommit]} {
	after 1000 hint_gc
}