#!/bin/sh
# Tcl ignores the next line -*- tcl -*- \
exec wish "$0" -- "$@"

# Copyright (C) 2006 Shawn Pearce, Paul Mackerras.  All rights reserved.
# This program is free software; it may be used, copied, modified
# and distributed under the terms of the GNU General Public Licence,
# either version 2, or (at your option) any later version.

set appname [lindex [file split $argv0] end]
set gitdir {}

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

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

proc load_config {include_global} {
	global repo_config global_config default_config

	array unset global_config
	if {$include_global} {
		catch {
			set fd_rc [open "| git repo-config --global --list" r]
			while {[gets $fd_rc line] >= 0} {
				if {[regexp {^([^=]+)=(.*)$} $line line name value]} {
					if {[is_many_config $name]} {
						lappend global_config($name) $value
					} else {
						set global_config($name) $value
					}
				}
			}
			close $fd_rc
		}
	}

	array unset repo_config
	catch {
		set fd_rc [open "| git repo-config --list" r]
		while {[gets $fd_rc line] >= 0} {
			if {[regexp {^([^=]+)=(.*)$} $line line name value]} {
				if {[is_many_config $name]} {
					lappend repo_config($name) $value
				} else {
					set repo_config($name) $value
				}
			}
		}
		close $fd_rc
	}

	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)
		}
	}
}

proc save_config {} {
	global default_config font_descs
	global repo_config global_config
	global repo_config_new global_config_new

	foreach option $font_descs {
		set name [lindex $option 0]
		set font [lindex $option 1]
		font configure $font \
			-family $global_config_new(gui.$font^^family) \
			-size $global_config_new(gui.$font^^size)
		font configure ${font}bold \
			-family $global_config_new(gui.$font^^family) \
			-size $global_config_new(gui.$font^^size)
		set global_config_new(gui.$name) [font configure $font]
		unset global_config_new(gui.$font^^family)
		unset global_config_new(gui.$font^^size)
	}

	foreach name [array names default_config] {
		set value $global_config_new($name)
		if {$value ne $global_config($name)} {
			if {$value eq $default_config($name)} {
				catch {exec git repo-config --global --unset $name}
			} else {
				regsub -all "\[{}\]" $value {"} value
				exec git repo-config --global $name $value
			}
			set global_config($name) $value
			if {$value eq $repo_config($name)} {
				catch {exec git repo-config --unset $name}
				set repo_config($name) $value
			}
		}
	}

	foreach name [array names default_config] {
		set value $repo_config_new($name)
		if {$value ne $repo_config($name)} {
			if {$value eq $global_config($name)} {
				catch {exec git repo-config --unset $name}
			} else {
				regsub -all "\[{}\]" $value {"} value
				exec git repo-config $name $value
			}
			set repo_config($name) $value
		}
	}
}

proc error_popup {msg} {
	global gitdir appname

	set title $appname
	if {$gitdir ne {}} {
		append title { (}
		append title [lindex \
			[file split [file normalize [file dirname $gitdir]]] \
			end]
		append title {)}
	}
	tk_messageBox \
		-parent . \
		-icon error \
		-type ok \
		-title "$title: error" \
		-message $msg
}

proc info_popup {msg} {
	global gitdir appname

	set title $appname
	if {$gitdir ne {}} {
		append title { (}
		append title [lindex \
			[file split [file normalize [file dirname $gitdir]]] \
			end]
		append title {)}
	}
	tk_messageBox \
		-parent . \
		-icon error \
		-type ok \
		-title $title \
		-message $msg
}

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

if {   [catch {set cdup [exec git rev-parse --show-cdup]} err]
	|| [catch {set gitdir [exec git rev-parse --git-dir]} err]} {
	catch {wm withdraw .}
	error_popup "Cannot find the git directory:\n\n$err"
	exit 1
}
if {$cdup ne ""} {
	cd $cdup
}
unset cdup

set single_commit 0
if {$appname eq {git-citool}} {
	set single_commit 1
}

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

set status_active 0
set diff_active 0

set disable_on_lock [list]
set index_lock_type none

set HEAD {}
set PARENT {}
set commit_type {}

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-update} && $type eq {update}} {
		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 {hdvar ctvar} {
	global gitdir
	upvar $hdvar hd $ctvar ct

	if {[catch {set hd [exec git rev-parse --verify HEAD]}]} {
		set ct initial
	} elseif {[file exists [file join $gitdir MERGE_HEAD]]} {
		set ct merge
	} else {
		set ct normal
	}
}

proc update_status {{final Ready.}} {
	global HEAD PARENT commit_type
	global ui_index ui_other ui_status_value ui_comm
	global status_active file_states
	global repo_config

	if {$status_active || ![lock_index read]} return

	repository_state new_HEAD new_type
	if {$commit_type eq {amend}
		&& $new_type eq {normal}
		&& $new_HEAD eq $HEAD} {
	} else {
		set HEAD $new_HEAD
		set PARENT $new_HEAD
		set commit_type $new_type
	}

	array unset file_states

	if {![$ui_comm edit modified]
		|| [string trim [$ui_comm get 0.0 end]] eq {}} {
		if {[load_message GITGUI_MSG]} {
		} elseif {[load_message MERGE_MSG]} {
		} elseif {[load_message SQUASH_MSG]} {
		}
		$ui_comm edit modified false
		$ui_comm edit reset
	}

	if {$repo_config(gui.trustmtime) eq {true}} {
		update_status_stage2 {} $final
	} else {
		set status_active 1
		set ui_status_value {Refreshing file status...}
		set cmd [list git update-index]
		lappend cmd -q
		lappend cmd --unmerged
		lappend cmd --ignore-missing
		lappend cmd --refresh
		set fd_rf [open "| $cmd" r]
		fconfigure $fd_rf -blocking 0 -translation binary
		fileevent $fd_rf readable \
			[list update_status_stage2 $fd_rf $final]
	}
}

proc update_status_stage2 {fd final} {
	global gitdir PARENT commit_type
	global ui_index ui_other ui_status_value ui_comm
	global status_active
	global buf_rdi buf_rdf buf_rlo

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

	set ls_others [list | git ls-files --others -z \
		--exclude-per-directory=.gitignore]
	set info_exclude [file join $gitdir info exclude]
	if {[file readable $info_exclude]} {
		lappend ls_others "--exclude-from=$info_exclude"
	}

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

	set status_active 3
	set ui_status_value {Scanning for modified files ...}
	set fd_di [open "| git diff-index --cached -z $PARENT" r]
	set fd_df [open "| git diff-files -z" r]
	set fd_lo [open $ls_others r]

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

proc load_message {file} {
	global gitdir ui_comm

	set f [file join $gitdir $file]
	if {[file isfile $f]} {
		if {[catch {set fd [open $f r]}]} {
			return 0
		}
		set content [string trim [read $fd]]
		close $fd
		$ui_comm delete 0.0 end
		$ui_comm insert end $content
		return 1
	}
	return 0
}

proc read_diff_index {fd final} {
	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

		set c $z2
		incr z2 -1
		display_file \
			[string range $buf_rdi $z1 $z2] \
			[string index $buf_rdi [expr $z1 - 2]]_
		incr c
	}
	if {$c < $n} {
		set buf_rdi [string range $buf_rdi $c end]
	} else {
		set buf_rdi {}
	}

	status_eof $fd buf_rdi $final
}

proc read_diff_files {fd final} {
	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

		set c $z2
		incr z2 -1
		display_file \
			[string range $buf_rdf $z1 $z2] \
			_[string index $buf_rdf [expr $z1 - 2]]
		incr c
	}
	if {$c < $n} {
		set buf_rdf [string range $buf_rdf $c end]
	} else {
		set buf_rdf {}
	}

	status_eof $fd buf_rdf $final
}

proc read_ls_others {fd final} {
	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] {
		display_file $p _O
	}
	status_eof $fd buf_rlo $final
}

proc status_eof {fd buf final} {
	global status_active ui_status_value
	upvar $buf to_clear

	if {[eof $fd]} {
		set to_clear {}
		close $fd

		if {[incr status_active -1] == 0} {
			display_all_files
			unlock_index
			reshow_diff
			set ui_status_value $final
		}
	}
}

######################################################################
##
## diff

proc clear_diff {} {
	global ui_diff ui_fname_value ui_fstatus_value ui_index ui_other

	$ui_diff conf -state normal
	$ui_diff delete 0.0 end
	$ui_diff conf -state disabled

	set ui_fname_value {}
	set ui_fstatus_value {}

	$ui_index tag remove in_diff 0.0 end
	$ui_other tag remove in_diff 0.0 end
}

proc reshow_diff {} {
	global ui_fname_value ui_status_value file_states

	if {$ui_fname_value eq {}
		|| [catch {set s $file_states($ui_fname_value)}]} {
		clear_diff
	} else {
		show_diff $ui_fname_value
	}
}

proc handle_empty_diff {} {
	global ui_fname_value file_states file_lists

	set path $ui_fname_value
	set s $file_states($path)
	if {[lindex $s 0] ne {_M}} return

	info_popup "No differences detected.

[short_path $path] has no changes.

The modification date of this file was updated by another
application and you currently have the Trust File Modification
Timestamps option enabled, so Git did not automatically detect
that there are no content differences in this file.

This file will now be removed from the modified files list, to
prevent possible confusion.
"
	if {[catch {exec git update-index -- $path} err]} {
		error_popup "Failed to refresh index:\n\n$err"
	}

	clear_diff
	set old_w [mapcol [lindex $file_states($path) 0] $path]
	set lno [lsearch -sorted $file_lists($old_w) $path]
	if {$lno >= 0} {
		set file_lists($old_w) \
			[lreplace $file_lists($old_w) $lno $lno]
		incr lno
		$old_w conf -state normal
		$old_w delete $lno.0 [expr $lno + 1].0
		$old_w conf -state disabled
	}
}

proc show_diff {path {w {}} {lno {}}} {
	global file_states file_lists
	global PARENT diff_3way diff_active repo_config
	global ui_diff ui_fname_value ui_fstatus_value ui_status_value

	if {$diff_active || ![lock_index read]} return

	clear_diff
	if {$w eq {} || $lno == {}} {
		foreach w [array names file_lists] {
			set lno [lsearch -sorted $file_lists($w) $path]
			if {$lno >= 0} {
				incr lno
				break
			}
		}
	}
	if {$w ne {} && $lno >= 1} {
		$w tag add in_diff $lno.0 [expr $lno + 1].0
	}

	set s $file_states($path)
	set m [lindex $s 0]
	set diff_3way 0
	set diff_active 1
	set ui_fname_value [escape_path $path]
	set ui_fstatus_value [mapdesc $m $path]
	set ui_status_value "Loading diff of [escape_path $path]..."

	set cmd [list | git diff-index]
	lappend cmd --no-color
	lappend cmd -p

	switch $m {
	MM {
		lappend cmd -c
	}
	_O {
		if {[catch {
				set fd [open $path r]
				set content [read $fd]
				close $fd
			} err ]} {
			set diff_active 0
			unlock_index
			set ui_status_value "Unable to display [escape_path $path]"
			error_popup "Error loading file:\n\n$err"
			return
		}
		$ui_diff conf -state normal
		$ui_diff insert end $content
		$ui_diff conf -state disabled
		set diff_active 0
		unlock_index
		set ui_status_value {Ready.}
		return
	}
	}

	lappend cmd $PARENT
	lappend cmd --
	lappend cmd $path

	if {[catch {set fd [open $cmd r]} err]} {
		set diff_active 0
		unlock_index
		set ui_status_value "Unable to display [escape_path $path]"
		error_popup "Error loading diff:\n\n$err"
		return
	}

	fconfigure $fd -blocking 0 -translation auto
	fileevent $fd readable [list read_diff $fd]
}

proc read_diff {fd} {
	global ui_diff ui_status_value diff_3way diff_active
	global repo_config

	while {[gets $fd line] >= 0} {
		if {[string match {diff --git *} $line]} continue
		if {[string match {diff --combined *} $line]} continue
		if {[string match {--- *} $line]} continue
		if {[string match {+++ *} $line]} continue
		if {[string match index* $line]} {
			if {[string first , $line] >= 0} {
				set diff_3way 1
			}
		}

		$ui_diff conf -state normal
		if {!$diff_3way} {
			set x [string index $line 0]
			switch -- $x {
			"@" {set tags da}
			"+" {set tags dp}
			"-" {set tags dm}
			default {set tags {}}
			}
		} else {
			set x [string range $line 0 1]
			switch -- $x {
			default {set tags {}}
			"@@" {set tags da}
			"++" {set tags dp; set x " +"}
			" +" {set tags {di bold}; set x "++"}
			"+ " {set tags dni; set x "-+"}
			"--" {set tags dm; set x " -"}
			" -" {set tags {dm bold}; set x "--"}
			"- " {set tags di; set x "+-"}
			default {set tags {}}
			}
			set line [string replace $line 0 1 $x]
		}
		$ui_diff insert end $line $tags
		$ui_diff insert end "\n"
		$ui_diff conf -state disabled
	}

	if {[eof $fd]} {
		close $fd
		set diff_active 0
		unlock_index
		set ui_status_value {Ready.}

		if {$repo_config(gui.trustmtime) eq {true}
			&& [$ui_diff index end] eq {2.0}} {
			handle_empty_diff
		}
	}
}

######################################################################
##
## commit

proc load_last_commit {} {
	global HEAD PARENT commit_type ui_comm

	if {$commit_type eq {amend}} return
	if {$commit_type ne {normal}} {
		error_popup "Can't amend a $commit_type commit."
		return
	}

	set msg {}
	set parent {}
	set parent_count 0
	if {[catch {
			set fd [open "| git cat-file commit $HEAD" r]
			while {[gets $fd line] > 0} {
				if {[string match {parent *} $line]} {
					set parent [string range $line 7 end]
					incr parent_count
				}
			}
			set msg [string trim [read $fd]]
			close $fd
		} err]} {
		error_popup "Error loading commit data for amend:\n\n$err"
		return
	}

	if {$parent_count == 0} {
		set commit_type amend
		set HEAD {}
		set PARENT {}
		update_status
	} elseif {$parent_count == 1} {
		set commit_type amend
		set PARENT $parent
		$ui_comm delete 0.0 end
		$ui_comm insert end $msg
		$ui_comm edit modified false
		$ui_comm edit reset
		update_status
	} else {
		error_popup {You can't amend a merge commit.}
		return
	}
}

proc commit_tree {} {
	global tcl_platform HEAD gitdir commit_type file_states
	global pch_error
	global ui_status_value ui_comm

	if {![lock_index update]} return

	# -- Our in memory state should match the repository.
	#
	repository_state curHEAD cur_type
	if {$commit_type eq {amend}
		&& $cur_type eq {normal}
		&& $curHEAD eq $HEAD} {
	} elseif {$commit_type ne $cur_type || $HEAD ne $curHEAD} {
		error_popup {Last scanned state does not match repository state.

Its highly likely that another Git program modified the
repository since our last scan.  A rescan is required
before committing.
}
		unlock_index
		update_status
		return
	}

	# -- At least one file should differ in the index.
	#
	set files_ready 0
	foreach path [array names file_states] {
		set s $file_states($path)
		switch -glob -- [lindex $s 0] {
		_? {continue}
		A? -
		D? -
		M? {set files_ready 1; break}
		U? {
			error_popup "Unmerged files cannot be committed.

File [short_path $path] has merge conflicts.
You must resolve them and include the file before committing.
"
			unlock_index
			return
		}
		default {
			error_popup "Unknown file state [lindex $s 0] detected.

File [short_path $path] cannot be committed by this program.
"
		}
		}
	}
	if {!$files_ready} {
		error_popup {No included files to commit.

You must include at least 1 file before you can commit.
}
		unlock_index
		return
	}

	# -- A message is required.
	#
	set msg [string trim [$ui_comm get 1.0 end]]
	if {$msg eq {}} {
		error_popup {Please supply a commit message.

A good commit message has the following format:

- First line: Describe in one sentance what you did.
- Second line: Blank
- Remaining lines: Describe why this change is good.
}
		unlock_index
		return
	}

	# -- Ask the pre-commit hook for the go-ahead.
	#
	set pchook [file join $gitdir hooks pre-commit]
	if {$tcl_platform(platform) eq {windows} && [file isfile $pchook]} {
		set pchook [list sh -c [concat \
			"if test -x \"$pchook\";" \
			"then exec \"$pchook\" 2>&1;" \
			"fi"]]
	} elseif {[file executable $pchook]} {
		set pchook [list $pchook |& cat]
	} else {
		set pchook {}
	}
	if {$pchook ne {}} {
		set ui_status_value {Calling pre-commit hook...}
		set pch_error {}
		set fd_ph [open "| $pchook" r]
		fconfigure $fd_ph -blocking 0 -translation binary
		fileevent $fd_ph readable \
			[list commit_stage1 $fd_ph $curHEAD $msg]
	} else {
		commit_stage2 $curHEAD $msg
	}
}

proc commit_stage1 {fd_ph curHEAD msg} {
	global pch_error ui_status_value

	append pch_error [read $fd_ph]
	fconfigure $fd_ph -blocking 1
	if {[eof $fd_ph]} {
		if {[catch {close $fd_ph}]} {
			set ui_status_value {Commit declined by pre-commit hook.}
			hook_failed_popup pre-commit $pch_error
			unlock_index
		} else {
			commit_stage2 $curHEAD $msg
		}
		set pch_error {}
	} else {
		fconfigure $fd_ph -blocking 0
	}
}

proc commit_stage2 {curHEAD msg} {
	global ui_status_value

	# -- Write the tree in the background.
	#
	set ui_status_value {Committing changes...}
	set fd_wt [open "| git write-tree" r]
	fileevent $fd_wt readable [list commit_stage3 $fd_wt $curHEAD $msg]
}

proc commit_stage3 {fd_wt curHEAD msg} {
	global single_commit gitdir HEAD PARENT commit_type tcl_platform
	global ui_status_value ui_comm
	global file_states

	gets $fd_wt tree_id
	if {$tree_id eq {} || [catch {close $fd_wt} err]} {
		error_popup "write-tree failed:\n\n$err"
		set ui_status_value {Commit failed.}
		unlock_index
		return
	}

	# -- Create the commit.
	#
	set cmd [list git commit-tree $tree_id]
	if {$PARENT ne {}} {
		lappend cmd -p $PARENT
	}
	if {$commit_type eq {merge}} {
		if {[catch {
				set fd_mh [open [file join $gitdir MERGE_HEAD] r]
				while {[gets $fd_mh merge_head] >= 0} {
					lappend cmd -p $merge_head
				}
				close $fd_mh
			} err]} {
			error_popup "Loading MERGE_HEAD failed:\n\n$err"
			set ui_status_value {Commit failed.}
			unlock_index
			return
		}
	}
	if {$PARENT eq {}} {
		# git commit-tree writes to stderr during initial commit.
		lappend cmd 2>/dev/null
	}
	lappend cmd << $msg
	if {[catch {set cmt_id [eval exec $cmd]} err]} {
		error_popup "commit-tree failed:\n\n$err"
		set ui_status_value {Commit failed.}
		unlock_index
		return
	}

	# -- Update the HEAD ref.
	#
	set reflogm commit
	if {$commit_type ne {normal}} {
		append reflogm " ($commit_type)"
	}
	set i [string first "\n" $msg]
	if {$i >= 0} {
		append reflogm {: } [string range $msg 0 [expr $i - 1]]
	} else {
		append reflogm {: } $msg
	}
	set cmd [list git update-ref -m $reflogm HEAD $cmt_id $curHEAD]
	if {[catch {eval exec $cmd} err]} {
		error_popup "update-ref failed:\n\n$err"
		set ui_status_value {Commit failed.}
		unlock_index
		return
	}

	# -- Cleanup after ourselves.
	#
	catch {file delete [file join $gitdir MERGE_HEAD]}
	catch {file delete [file join $gitdir MERGE_MSG]}
	catch {file delete [file join $gitdir SQUASH_MSG]}
	catch {file delete [file join $gitdir GITGUI_MSG]}

	# -- Let rerere do its thing.
	#
	if {[file isdirectory [file join $gitdir rr-cache]]} {
		catch {exec git rerere}
	}

	# -- Run the post-commit hook.
	#
	set pchook [file join $gitdir hooks post-commit]
	if {$tcl_platform(platform) eq {windows} && [file isfile $pchook]} {
		set pchook [list sh -c [concat \
			"if test -x \"$pchook\";" \
			"then exec \"$pchook\";" \
			"fi"]]
	} elseif {![file executable $pchook]} {
		set pchook {}
	}
	if {$pchook ne {}} {
		catch {exec $pchook &}
	}

	$ui_comm delete 0.0 end
	$ui_comm edit modified false
	$ui_comm edit reset

	if {$single_commit} do_quit

	# -- Update status without invoking any git commands.
	#
	set commit_type normal
	set HEAD $cmt_id
	set PARENT $cmt_id

	foreach path [array names file_states] {
		set s $file_states($path)
		set m [lindex $s 0]
		switch -glob -- $m {
		A? -
		M? -
		D? {set m _[string index $m 1]}
		}

		if {$m eq {__}} {
			unset file_states($path)
		} else {
			lset file_states($path) 0 $m
		}
	}

	display_all_files
	unlock_index
	reshow_diff
	set ui_status_value \
		"Changes committed as [string range $cmt_id 0 7]."
}

######################################################################
##
## fetch pull push

proc fetch_from {remote} {
	set w [new_console "fetch $remote" \
		"Fetching new changes from $remote"]
	set cmd [list git fetch]
	lappend cmd $remote
	console_exec $w $cmd
}

proc pull_remote {remote branch} {
	global HEAD commit_type file_states repo_config

	if {![lock_index update]} return

	# -- Our in memory state should match the repository.
	#
	repository_state curHEAD cur_type
	if {$commit_type ne $cur_type || $HEAD ne $curHEAD} {
		error_popup {Last scanned state does not match repository state.

Its highly likely that another Git program modified the
repository since our last scan.  A rescan is required
before a pull can be started.
}
		unlock_index
		update_status
		return
	}

	# -- No differences should exist before a pull.
	#
	if {[array size file_states] != 0} {
		error_popup {Uncommitted but modified files are present.

You should not perform a pull with unmodified files in your working
directory as Git would be unable to recover from an incorrect merge.

Commit or throw away all changes before starting a pull operation.
}
		unlock_index
		return
	}

	set w [new_console "pull $remote $branch" \
		"Pulling new changes from branch $branch in $remote"]
	set cmd [list git pull]
	if {$repo_config(gui.pullsummary) eq {false}} {
		lappend cmd --no-summary
	}
	lappend cmd $remote
	lappend cmd $branch
	console_exec $w $cmd [list post_pull_remote $remote $branch]
}

proc post_pull_remote {remote branch success} {
	global HEAD PARENT commit_type
	global ui_status_value

	unlock_index
	if {$success} {
		repository_state HEAD commit_type
		set PARENT $HEAD
		set $ui_status_value {Ready.}
	} else {
		update_status \
			"Conflicts detected while pulling $branch from $remote."
	}
}

proc push_to {remote} {
	set w [new_console "push $remote" \
		"Pushing changes to $remote"]
	set cmd [list git push]
	lappend cmd $remote
	console_exec $w $cmd
}

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

proc mapcol {state path} {
	global all_cols ui_other

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

proc mapicon {state path} {
	global all_icons

	if {[catch {set r $all_icons($state)}]} {
		puts "error: no icon for 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 escape_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

proc merge_state {path new_state} {
	global file_states next_icon_id

	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 {$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 _
	}

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

proc display_file {path state} {
	global file_states file_lists status_active

	set old_m [merge_state $path $state]
	if {$status_active} return

	set s $file_states($path)
	set new_m [lindex $s 0]
	set new_w [mapcol $new_m $path] 
	set old_w [mapcol $old_m $path]
	set new_icon [mapicon $new_m $path]

	if {$new_w ne $old_w} {
		set lno [lsearch -sorted $file_lists($old_w) $path]
		if {$lno >= 0} {
			incr lno
			$old_w conf -state normal
			$old_w delete $lno.0 [expr $lno + 1].0
			$old_w conf -state disabled
		}

		lappend file_lists($new_w) $path
		set file_lists($new_w) [lsort $file_lists($new_w)]
		set lno [lsearch -sorted $file_lists($new_w) $path]
		incr lno
		$new_w conf -state normal
		$new_w image create $lno.0 \
			-align center -padx 5 -pady 1 \
			-name [lindex $s 1] \
			-image $new_icon
		$new_w insert $lno.1 "[escape_path $path]\n"
		$new_w conf -state disabled
	} elseif {$new_icon ne [mapicon $old_m $path]} {
		$new_w conf -state normal
		$new_w image conf [lindex $s 1] -image $new_icon
		$new_w conf -state disabled
	}
}

proc display_all_files {} {
	global ui_index ui_other file_states file_lists

	$ui_index conf -state normal
	$ui_other conf -state normal

	$ui_index delete 0.0 end
	$ui_other delete 0.0 end

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

	foreach path [lsort [array names file_states]] {
		set s $file_states($path)
		set m [lindex $s 0]
		set w [mapcol $m $path]
		lappend file_lists($w) $path
		$w image create end \
			-align center -padx 5 -pady 1 \
			-name [lindex $s 1] \
			-image [mapicon $m $path]
		$w insert end "[escape_path $path]\n"
	}

	$ui_index conf -state disabled
	$ui_other conf -state disabled
}

proc update_index {pathList} {
	global update_index_cp update_index_rsd ui_status_value

	if {![lock_index update]} return

	set update_index_cp 0
	set update_index_rsd 0
	set totalCnt [llength $pathList]
	set batch [expr {int($totalCnt * .01) + 1}]
	if {$batch > 25} {set batch 25}

	set ui_status_value "Including files ... 0/$totalCnt 0%"
	set ui_status_value [format \
		"Including files ... %i/%i files (%.2f%%)" \
		$update_index_cp \
		$totalCnt \
		0.0]
	set fd [open "| git update-index --add --remove -z --stdin" w]
	fconfigure $fd -blocking 0 -translation binary
	fileevent $fd writable [list \
		write_update_index \
		$fd \
		$pathList \
		$totalCnt \
		$batch \
		]
}

proc write_update_index {fd pathList totalCnt batch} {
	global update_index_cp update_index_rsd ui_status_value
	global file_states ui_fname_value

	if {$update_index_cp >= $totalCnt} {
		close $fd
		unlock_index
		if {$update_index_rsd} {
			reshow_diff
		} else {
			set ui_status_value {Ready.}
		}
		return
	}

	for {set i $batch} \
		{$update_index_cp < $totalCnt && $i > 0} \
		{incr i -1} {
		set path [lindex $pathList $update_index_cp]
		incr update_index_cp

		switch -- [lindex $file_states($path) 0] {
		AM -
		_O {set new A*}
		_M -
		MM {set new M*}
		AD -
		_D {set new D*}
		default {continue}
		}

		puts -nonewline $fd $path
		puts -nonewline $fd "\0"
		display_file $path $new
		if {$ui_fname_value eq $path} {
			set update_index_rsd 1
		}
	}

	set ui_status_value [format \
		"Including files ... %i/%i files (%.2f%%)" \
		$update_index_cp \
		$totalCnt \
		[expr {100.0 * $update_index_cp / $totalCnt}]]
}

######################################################################
##
## remote management

proc load_all_remotes {} {
	global gitdir all_remotes repo_config

	set all_remotes [list]
	set rm_dir [file join $gitdir remotes]
	if {[file isdirectory $rm_dir]} {
		set all_remotes [concat $all_remotes [glob \
			-types f \
			-tails \
			-nocomplain \
			-directory $rm_dir *]]
	}

	foreach line [array names repo_config remote.*.url] {
		if {[regexp ^remote\.(.*)\.url\$ $line line name]} {
			lappend all_remotes $name
		}
	}

	set all_remotes [lsort -unique $all_remotes]
}

proc populate_remote_menu {m pfx op} {
	global all_remotes

	foreach remote $all_remotes {
		$m add command -label "$pfx $remote..." \
			-command [list $op $remote] \
			-font font_ui
	}
}

proc populate_pull_menu {m} {
	global gitdir repo_config all_remotes disable_on_lock

	foreach remote $all_remotes {
		set rb {}
		if {[array get repo_config remote.$remote.url] ne {}} {
			if {[array get repo_config remote.$remote.fetch] ne {}} {
				regexp {^([^:]+):} \
					[lindex $repo_config(remote.$remote.fetch) 0] \
					line rb
			}
		} else {
			catch {
				set fd [open [file join $gitdir remotes $remote] r]
				while {[gets $fd line] >= 0} {
					if {[regexp {^Pull:[ \t]*([^:]+):} $line line rb]} {
						break
					}
				}
				close $fd
			}
		}

		set rb_short $rb
		regsub ^refs/heads/ $rb {} rb_short
		if {$rb_short ne {}} {
			$m add command \
				-label "Branch $rb_short from $remote..." \
				-command [list pull_remote $remote $rb] \
				-font font_ui
			lappend disable_on_lock \
				[list $m entryconf [$m index last] -state]
		}
	}
}

######################################################################
##
## 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

set ui_index .vpane.files.index.list
set ui_other .vpane.files.other.list
set max_status_desc 0
foreach i {
		{__ i plain    "Unmodified"}
		{_M i mod      "Modified"}
		{M_ i fulltick "Checked in"}
		{MM i parttick "Partially included"}

		{_O o plain    "Untracked"}
		{A_ o fulltick "Added"}
		{AM o parttick "Partially added"}
		{AD o question "Added (but now gone)"}

		{_D i question "Missing"}
		{D_ i removed  "Removed"}
		{DD i removed  "Removed"}
		{DO i removed  "Removed (still exists)"}

		{UM i merge    "Merge conflicts"}
		{U_ i merge    "Merge conflicts"}
	} {
	if {$max_status_desc < [string length [lindex $i 3]]} {
		set max_status_desc [string length [lindex $i 3]]
	}
	if {[lindex $i 1] eq {i}} {
		set all_cols([lindex $i 0]) $ui_index
	} else {
		set all_cols([lindex $i 0]) $ui_other
	}
	set all_icons([lindex $i 0]) file_[lindex $i 2]
	set all_descs([lindex $i 0]) [lindex $i 3]
}
unset filemask i

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

proc is_MacOSX {} {
	global tcl_platform tk_library
	if {$tcl_platform(platform) eq {unix}
		&& $tcl_platform(os) eq {Darwin}
		&& [string match /Library/Frameworks/* $tk_library]} {
		return 1
	}
	return 0
}

proc bind_button3 {w cmd} {
	bind $w <Any-Button-3> $cmd
	if {[is_MacOSX]} {
		bind $w <Control-Button-1> $cmd
	}
}

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
}

proc hook_failed_popup {hook msg} {
	global gitdir appname

	set w .hookfail
	toplevel $w

	frame $w.m
	label $w.m.l1 -text "$hook hook failed:" \
		-anchor w \
		-justify left \
		-font font_uibold
	text $w.m.t \
		-background white -borderwidth 1 \
		-relief sunken \
		-width 80 -height 10 \
		-font font_diff \
		-yscrollcommand [list $w.m.sby set]
	label $w.m.l2 \
		-text {You must correct the above errors before committing.} \
		-anchor w \
		-justify left \
		-font font_uibold
	scrollbar $w.m.sby -command [list $w.m.t yview]
	pack $w.m.l1 -side top -fill x
	pack $w.m.l2 -side bottom -fill x
	pack $w.m.sby -side right -fill y
	pack $w.m.t -side left -fill both -expand 1
	pack $w.m -side top -fill both -expand 1 -padx 5 -pady 10

	$w.m.t insert 1.0 $msg
	$w.m.t conf -state disabled

	button $w.ok -text OK \
		-width 15 \
		-font font_ui \
		-command "destroy $w"
	pack $w.ok -side bottom

	bind $w <Visibility> "grab $w; focus $w"
	bind $w <Key-Return> "destroy $w"
	wm title $w "$appname ([lindex [file split \
		[file normalize [file dirname $gitdir]]] \
		end]): error"
	tkwait window $w
}

set next_console_id 0

proc new_console {short_title long_title} {
	global next_console_id console_data
	set w .console[incr next_console_id]
	set console_data($w) [list $short_title $long_title]
	return [console_init $w]
}

proc console_init {w} {
	global console_cr console_data
	global gitdir appname M1B

	set console_cr($w) 1.0
	toplevel $w
	frame $w.m
	label $w.m.l1 -text "[lindex $console_data($w) 1]:" \
		-anchor w \
		-justify left \
		-font font_uibold
	text $w.m.t \
		-background white -borderwidth 1 \
		-relief sunken \
		-width 80 -height 10 \
		-font font_diff \
		-state disabled \
		-yscrollcommand [list $w.m.sby set]
	label $w.m.s -anchor w \
		-justify left \
		-font font_uibold
	scrollbar $w.m.sby -command [list $w.m.t yview]
	pack $w.m.l1 -side top -fill x
	pack $w.m.s -side bottom -fill x
	pack $w.m.sby -side right -fill y
	pack $w.m.t -side left -fill both -expand 1
	pack $w.m -side top -fill both -expand 1 -padx 5 -pady 10

	menu $w.ctxm -tearoff 0
	$w.ctxm add command -label "Copy" \
		-font font_ui \
		-command "tk_textCopy $w.m.t"
	$w.ctxm add command -label "Select All" \
		-font font_ui \
		-command "$w.m.t tag add sel 0.0 end"
	$w.ctxm add command -label "Copy All" \
		-font font_ui \
		-command "
			$w.m.t tag add sel 0.0 end
			tk_textCopy $w.m.t
			$w.m.t tag remove sel 0.0 end
		"

	button $w.ok -text {Running...} \
		-width 15 \
		-font font_ui \
		-state disabled \
		-command "destroy $w"
	pack $w.ok -side bottom

	bind_button3 $w.m.t "tk_popup $w.ctxm %X %Y"
	bind $w.m.t <$M1B-Key-a> "$w.m.t tag add sel 0.0 end;break"
	bind $w.m.t <$M1B-Key-A> "$w.m.t tag add sel 0.0 end;break"
	bind $w <Visibility> "focus $w"
	wm title $w "$appname ([lindex [file split \
		[file normalize [file dirname $gitdir]]] \
		end]): [lindex $console_data($w) 0]"
	return $w
}

proc console_exec {w cmd {after {}}} {
	global tcl_platform

	# -- Windows tosses the enviroment when we exec our child.
	#    But most users need that so we have to relogin. :-(
	#
	if {$tcl_platform(platform) eq {windows}} {
		set cmd [list sh --login -c "cd \"[pwd]\" && [join $cmd { }]"]
	}

	# -- Tcl won't let us redirect both stdout and stderr to
	#    the same pipe.  So pass it through cat...
	#
	set cmd [concat | $cmd |& cat]

	set fd_f [open $cmd r]
	fconfigure $fd_f -blocking 0 -translation binary
	fileevent $fd_f readable [list console_read $w $fd_f $after]
}

proc console_read {w fd after} {
	global console_cr console_data

	set buf [read $fd]
	if {$buf ne {}} {
		if {![winfo exists $w]} {console_init $w}
		$w.m.t conf -state normal
		set c 0
		set n [string length $buf]
		while {$c < $n} {
			set cr [string first "\r" $buf $c]
			set lf [string first "\n" $buf $c]
			if {$cr < 0} {set cr [expr $n + 1]}
			if {$lf < 0} {set lf [expr $n + 1]}

			if {$lf < $cr} {
				$w.m.t insert end [string range $buf $c $lf]
				set console_cr($w) [$w.m.t index {end -1c}]
				set c $lf
				incr c
			} else {
				$w.m.t delete $console_cr($w) end
				$w.m.t insert end "\n"
				$w.m.t insert end [string range $buf $c $cr]
				set c $cr
				incr c
			}
		}
		$w.m.t conf -state disabled
		$w.m.t see end
	}

	fconfigure $fd -blocking 1
	if {[eof $fd]} {
		if {[catch {close $fd}]} {
			if {![winfo exists $w]} {console_init $w}
			$w.m.s conf -background red -text {Error: Command Failed}
			$w.ok conf -text Close
			$w.ok conf -state normal
			set ok 0
		} elseif {[winfo exists $w]} {
			$w.m.s conf -background green -text {Success}
			$w.ok conf -text Close
			$w.ok conf -state normal
			set ok 1
		}
		array unset console_cr $w
		array unset console_data $w
		if {$after ne {}} {
			uplevel #0 $after $ok
		}
		return
	}
	fconfigure $fd -blocking 0
}

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

set starting_gitk_msg {Please wait... Starting gitk...}

proc do_gitk {} {
	global tcl_platform ui_status_value starting_gitk_msg

	set ui_status_value $starting_gitk_msg
	after 10000 {
		if {$ui_status_value eq $starting_gitk_msg} {
			set ui_status_value {Ready.}
		}
	}

	if {$tcl_platform(platform) eq {windows}} {
		exec sh -c gitk &
	} else {
		exec gitk &
	}
}

proc do_repack {} {
	set w [new_console "repack" "Repacking the object database"]
	set cmd [list git repack]
	lappend cmd -a
	lappend cmd -d
	console_exec $w $cmd
}

set is_quitting 0

proc do_quit {} {
	global gitdir ui_comm is_quitting repo_config

	if {$is_quitting} return
	set is_quitting 1

	# -- Stash our current commit buffer.
	#
	set save [file join $gitdir GITGUI_MSG]
	set msg [string trim [$ui_comm get 0.0 end]]
	if {[$ui_comm edit modified] && $msg ne {}} {
		catch {
			set fd [open $save w]
			puts $fd [string trim [$ui_comm get 0.0 end]]
			close $fd
		}
	} elseif {$msg eq {} && [file exists $save]} {
		file delete $save
	}

	# -- 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] 1]
	lappend cfg_geometry [lindex [.vpane.files sash coord 0] 0]
	if {[catch {set rc_geometry $repo_config(gui.geometry)}]} {
		set rc_geometry {}
	}
	if {$cfg_geometry ne $rc_geometry} {
		catch {exec git repo-config gui.geometry $cfg_geometry}
	}

	destroy .
}

proc do_rescan {} {
	update_status
}

proc do_include_all {} {
	global file_states

	if {![lock_index begin-update]} return

	set pathList [list]
	foreach path [array names file_states] {
		set s $file_states($path)
		set m [lindex $s 0]
		switch -- $m {
		AM -
		MM -
		_M -
		_D {lappend pathList $path}
		}
	}
	if {$pathList eq {}} {
		unlock_index
	} else {
		update_index $pathList
	}
}

set GIT_COMMITTER_IDENT {}

proc do_signoff {} {
	global ui_comm GIT_COMMITTER_IDENT

	if {$GIT_COMMITTER_IDENT eq {}} {
		if {[catch {set me [exec git var GIT_COMMITTER_IDENT]} err]} {
			error_popup "Unable to obtain your identity:\n\n$err"
			return
		}
		if {![regexp {^(.*) [0-9]+ [-+0-9]+$} \
			$me me GIT_COMMITTER_IDENT]} {
			error_popup "Invalid GIT_COMMITTER_IDENT:\n\n$me"
			return
		}
	}

	set sob "Signed-off-by: $GIT_COMMITTER_IDENT"
	set last [$ui_comm get {end -1c linestart} {end -1c}]
	if {$last ne $sob} {
		$ui_comm edit separator
		if {$last ne {}
			&& ![regexp {^[A-Z][A-Za-z]*-[A-Za-z-]+: *} $last]} {
			$ui_comm insert end "\n"
		}
		$ui_comm insert end "\n$sob"
		$ui_comm edit separator
		$ui_comm see end
	}
}

proc do_amend_last {} {
	load_last_commit
}

proc do_commit {} {
	commit_tree
}

proc do_options {} {
	global appname gitdir font_descs
	global repo_config global_config
	global repo_config_new global_config_new

	load_config 1
	array unset repo_config_new
	array unset global_config_new
	foreach name [array names repo_config] {
		set repo_config_new($name) $repo_config($name)
	}
	foreach name [array names global_config] {
		set global_config_new($name) $global_config($name)
	}
	set reponame [lindex [file split \
		[file normalize [file dirname $gitdir]]] \
		end]

	set w .options_editor
	toplevel $w
	wm geometry $w "+[winfo rootx .]+[winfo rooty .]"

	label $w.header -text "$appname Options" \
		-font font_uibold
	pack $w.header -side top -fill x

	frame $w.buttons
	button $w.buttons.restore -text {Restore Defaults} \
		-font font_ui \
		-command do_restore_defaults
	pack $w.buttons.restore -side left
	button $w.buttons.save -text Save \
		-font font_ui \
		-command [list do_save_config $w]
	pack $w.buttons.save -side right
	button $w.buttons.cancel -text {Cancel} \
		-font font_ui \
		-command [list destroy $w]
	pack $w.buttons.cancel -side right
	pack $w.buttons -side bottom -fill x -pady 10 -padx 10

	labelframe $w.repo -text "$reponame Repository" \
		-font font_ui \
		-relief raised -borderwidth 2
	labelframe $w.global -text {Global (All Repositories)} \
		-font font_ui \
		-relief raised -borderwidth 2
	pack $w.repo -side left -fill both -expand 1 -pady 5 -padx 5
	pack $w.global -side right -fill both -expand 1 -pady 5 -padx 5

	foreach option {
		{pullsummary {Show Pull Summary}}
		{trustmtime {Trust File Modification Timestamps}}
		} {
		set name [lindex $option 0]
		set text [lindex $option 1]
		foreach f {repo global} {
			checkbutton $w.$f.$name -text $text \
				-variable ${f}_config_new(gui.$name) \
				-onvalue true \
				-offvalue false \
				-font font_ui
			pack $w.$f.$name -side top -anchor w
		}
	}

	set all_fonts [lsort [font families]]
	foreach option $font_descs {
		set name [lindex $option 0]
		set font [lindex $option 1]
		set text [lindex $option 2]

		set global_config_new(gui.$font^^family) \
			[font configure $font -family]
		set global_config_new(gui.$font^^size) \
			[font configure $font -size]

		frame $w.global.$name
		label $w.global.$name.l -text "$text:" -font font_ui
		pack $w.global.$name.l -side left -anchor w -fill x
		eval tk_optionMenu $w.global.$name.family \
			global_config_new(gui.$font^^family) \
			$all_fonts
		spinbox $w.global.$name.size \
			-textvariable global_config_new(gui.$font^^size) \
			-from 2 -to 80 -increment 1 \
			-width 3 \
			-font font_ui
		pack $w.global.$name.size -side right -anchor e
		pack $w.global.$name.family -side right -anchor e
		pack $w.global.$name -side top -anchor w -fill x
	}

	bind $w <Visibility> "grab $w; focus $w"
	bind $w <Key-Escape> "destroy $w"
	wm title $w "$appname ($reponame): Options"
	tkwait window $w
}

proc do_restore_defaults {} {
	global font_descs default_config repo_config
	global repo_config_new global_config_new

	foreach name [array names default_config] {
		set repo_config_new($name) $default_config($name)
		set global_config_new($name) $default_config($name)
	}

	foreach option $font_descs {
		set name [lindex $option 0]
		set repo_config(gui.$name) $default_config(gui.$name)
	}
	apply_config

	foreach option $font_descs {
		set name [lindex $option 0]
		set font [lindex $option 1]
		set global_config_new(gui.$font^^family) \
			[font configure $font -family]
		set global_config_new(gui.$font^^size) \
			[font configure $font -size]
	}
}

proc do_save_config {w} {
	if {[catch {save_config} err]} {
		error_popup "Failed to completely save options:\n\n$err"
	}
	destroy $w
}

# shift == 1: left click
#          3: right click  
proc click {w x y shift wx wy} {
	global ui_index ui_other file_lists

	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 {}} return

	if {$col > 0 && $shift == 1} {
		show_diff $path $w $lno
	}
}

proc unclick {w x y} {
	global file_lists

	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 {}} return

	if {$col == 0} {
		update_index [list $path]
	}
}

######################################################################
##
## 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_uibold
font create font_diffbold

set M1B M1
set M1T M1
if {$tcl_platform(platform) eq {windows}} {
	set M1B Control
	set M1T Ctrl
} elseif {[is_MacOSX]} {
	set M1B M1
	set M1T 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 {
			foreach {cn cv} $repo_config(gui.$name) {
				font configure $font $cn $cv
			}
			} err]} {
			error_popup "Invalid font specified in gui.$name:\n\n$err"
		}
		foreach {cn cv} [font configure $font] {
			font configure ${font}bold $cn $cv
		}
		font configure ${font}bold -weight bold
	}
}

set default_config(gui.trustmtime) false
set default_config(gui.pullsummary) true
set default_config(gui.fontui) [font configure font_ui]
set default_config(gui.fontdiff) [font configure font_diff]
set font_descs {
	{fontui   font_ui   {Main Font}}
	{fontdiff font_diff {Diff/Console Font}}
}
load_config 0
apply_config

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

# -- Menu Bar
menu .mbar -tearoff 0
.mbar add cascade -label Project -menu .mbar.project
.mbar add cascade -label Edit -menu .mbar.edit
.mbar add cascade -label Commit -menu .mbar.commit
if {!$single_commit} {
	.mbar add cascade -label Fetch -menu .mbar.fetch
	.mbar add cascade -label Pull -menu .mbar.pull
	.mbar add cascade -label Push -menu .mbar.push
}
. configure -menu .mbar

# -- Project Menu
menu .mbar.project
.mbar.project add command -label Visualize \
	-command do_gitk \
	-font font_ui
if {!$single_commit} {
	.mbar.project add command -label {Repack Database} \
		-command do_repack \
		-font font_ui
}
.mbar.project add command -label Quit \
	-command do_quit \
	-accelerator $M1T-Q \
	-font font_ui

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

# -- Commit Menu
menu .mbar.commit
.mbar.commit add command -label Rescan \
	-command do_rescan \
	-accelerator F5 \
	-font font_ui
lappend disable_on_lock \
	[list .mbar.commit entryconf [.mbar.commit index last] -state]
.mbar.commit add command -label {Amend Last Commit} \
	-command do_amend_last \
	-font font_ui
lappend disable_on_lock \
	[list .mbar.commit entryconf [.mbar.commit index last] -state]
.mbar.commit add command -label {Include All Files} \
	-command do_include_all \
	-accelerator $M1T-I \
	-font font_ui
lappend disable_on_lock \
	[list .mbar.commit entryconf [.mbar.commit index last] -state]
.mbar.commit add command -label {Sign Off} \
	-command do_signoff \
	-accelerator $M1T-S \
	-font font_ui
.mbar.commit add command -label Commit \
	-command do_commit \
	-accelerator $M1T-Return \
	-font font_ui
lappend disable_on_lock \
	[list .mbar.commit entryconf [.mbar.commit index last] -state]

if {!$single_commit} {
	# -- Fetch Menu
	menu .mbar.fetch

	# -- Pull Menu
	menu .mbar.pull

	# -- Push Menu
	menu .mbar.push
}

# -- Main Window Layout
panedwindow .vpane -orient vertical
panedwindow .vpane.files -orient horizontal
.vpane add .vpane.files -sticky nsew -height 100 -width 400
pack .vpane -anchor n -side top -fill both -expand 1

# -- Index File List
frame .vpane.files.index -height 100 -width 400
label .vpane.files.index.title -text {Modified Files} \
	-background green \
	-font font_ui
text $ui_index -background white -borderwidth 0 \
	-width 40 -height 10 \
	-font font_ui \
	-cursor $cursor_ptr \
	-yscrollcommand {.vpane.files.index.sb set} \
	-state disabled
scrollbar .vpane.files.index.sb -command [list $ui_index yview]
pack .vpane.files.index.title -side top -fill x
pack .vpane.files.index.sb -side right -fill y
pack $ui_index -side left -fill both -expand 1
.vpane.files add .vpane.files.index -sticky nsew

# -- Other (Add) File List
frame .vpane.files.other -height 100 -width 100
label .vpane.files.other.title -text {Untracked Files} \
	-background red \
	-font font_ui
text $ui_other -background white -borderwidth 0 \
	-width 40 -height 10 \
	-font font_ui \
	-cursor $cursor_ptr \
	-yscrollcommand {.vpane.files.other.sb set} \
	-state disabled
scrollbar .vpane.files.other.sb -command [list $ui_other yview]
pack .vpane.files.other.title -side top -fill x
pack .vpane.files.other.sb -side right -fill y
pack $ui_other -side left -fill both -expand 1
.vpane.files add .vpane.files.other -sticky nsew

$ui_index tag conf in_diff -font font_uibold
$ui_other tag conf in_diff -font font_uibold

# -- 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.commarea -side top -fill x
pack .vpane.lower.diff -side bottom -fill both -expand 1
.vpane add .vpane.lower -stick nsew

# -- Commit Area Buttons
frame .vpane.lower.commarea.buttons
label .vpane.lower.commarea.buttons.l -text {} \
	-anchor w \
	-justify left \
	-font font_ui
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 {Rescan} \
	-command do_rescan \
	-font font_ui
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.amend -text {Amend Last} \
	-command do_amend_last \
	-font font_ui
pack .vpane.lower.commarea.buttons.amend -side top -fill x
lappend disable_on_lock \
	{.vpane.lower.commarea.buttons.amend conf -state}

button .vpane.lower.commarea.buttons.incall -text {Include All} \
	-command do_include_all \
	-font font_ui
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 {Sign Off} \
	-command do_signoff \
	-font font_ui
pack .vpane.lower.commarea.buttons.signoff -side top -fill x

button .vpane.lower.commarea.buttons.commit -text {Commit} \
	-command do_commit \
	-font font_ui
pack .vpane.lower.commarea.buttons.commit -side top -fill x
lappend disable_on_lock \
	{.vpane.lower.commarea.buttons.commit conf -state}

# -- Commit Message Buffer
frame .vpane.lower.commarea.buffer
set ui_comm .vpane.lower.commarea.buffer.t
set ui_coml .vpane.lower.commarea.buffer.l
label $ui_coml -text {Commit Message:} \
	-anchor w \
	-justify left \
	-font font_ui
trace add variable commit_type write {uplevel #0 {
	switch -glob $commit_type \
	initial {$ui_coml conf -text {Initial Commit Message:}} \
	amend   {$ui_coml conf -text {Amended Commit Message:}} \
	merge   {$ui_coml conf -text {Merge Commit Message:}} \
	*       {$ui_coml conf -text {Commit Message:}}
}}
text $ui_comm -background white -borderwidth 1 \
	-undo true \
	-maxundo 20 \
	-autoseparators true \
	-relief sunken \
	-width 75 -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 $ui_coml -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
#
menu $ui_comm.ctxm -tearoff 0
$ui_comm.ctxm add command -label "Cut" \
	-font font_ui \
	-command "tk_textCut $ui_comm"
$ui_comm.ctxm add command -label "Copy" \
	-font font_ui \
	-command "tk_textCopy $ui_comm"
$ui_comm.ctxm add command -label "Paste" \
	-font font_ui \
	-command "tk_textPaste $ui_comm"
$ui_comm.ctxm add command -label "Delete" \
	-font font_ui \
	-command "$ui_comm delete sel.first sel.last"
$ui_comm.ctxm add separator
$ui_comm.ctxm add command -label "Select All" \
	-font font_ui \
	-command "$ui_comm tag add sel 0.0 end"
$ui_comm.ctxm add command -label "Copy All" \
	-font font_ui \
	-command "
		$ui_comm tag add sel 0.0 end
		tk_textCopy $ui_comm
		$ui_comm tag remove sel 0.0 end
	"
$ui_comm.ctxm add separator
$ui_comm.ctxm add command -label "Sign Off" \
	-font font_ui \
	-command do_signoff
bind_button3 $ui_comm "tk_popup $ui_comm.ctxm %X %Y"

# -- Diff Header
set ui_fname_value {}
set ui_fstatus_value {}
frame .vpane.lower.diff.header -background orange
label .vpane.lower.diff.header.l1 -text {File:} \
	-background orange \
	-font font_ui
label .vpane.lower.diff.header.l2 -textvariable ui_fname_value \
	-background orange \
	-anchor w \
	-justify left \
	-font font_ui
label .vpane.lower.diff.header.l3 -text {Status:} \
	-background orange \
	-font font_ui
label .vpane.lower.diff.header.l4 -textvariable ui_fstatus_value \
	-background orange \
	-width $max_status_desc \
	-anchor w \
	-justify left \
	-font font_ui
pack .vpane.lower.diff.header.l1 -side left
pack .vpane.lower.diff.header.l2 -side left -fill x
pack .vpane.lower.diff.header.l4 -side right
pack .vpane.lower.diff.header.l3 -side right

# -- Diff Body
frame .vpane.lower.diff.body
set ui_diff .vpane.lower.diff.body.t
text $ui_diff -background white -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 dm -foreground red
$ui_diff tag conf dp -foreground blue
$ui_diff tag conf di -foreground {#00a000}
$ui_diff tag conf dni -foreground {#a000a0}
$ui_diff tag conf da -font font_diffbold
$ui_diff tag conf bold -font font_diffbold

# -- Diff Body Context Menu
#
menu $ui_diff.ctxm -tearoff 0
$ui_diff.ctxm add command -label "Copy" \
	-font font_ui \
	-command "tk_textCopy $ui_diff"
$ui_diff.ctxm add command -label "Select All" \
	-font font_ui \
	-command "$ui_diff tag add sel 0.0 end"
$ui_diff.ctxm add command -label "Copy All" \
	-font font_ui \
	-command "
		$ui_diff tag add sel 0.0 end
		tk_textCopy $ui_diff
		$ui_diff tag remove sel 0.0 end
	"
$ui_diff.ctxm add separator
$ui_diff.ctxm add command -label "Decrease Font Size" \
	-font font_ui \
	-command {incr_font_size font_diff -1}
$ui_diff.ctxm add command -label "Increase Font Size" \
	-font font_ui \
	-command {incr_font_size font_diff 1}
$ui_diff.ctxm add command -label {Options...} \
	-font font_ui \
	-command do_options
bind_button3 $ui_diff "tk_popup $ui_diff.ctxm %X %Y"

# -- Status Bar
set ui_status_value {Initializing...}
label .status -textvariable ui_status_value \
	-anchor w \
	-justify left \
	-borderwidth 1 \
	-relief sunken \
	-font font_ui
pack .status -anchor w -side bottom -fill x

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

# -- Key Bindings
bind $ui_comm <$M1B-Key-Return> {do_commit;break}
bind $ui_comm <$M1B-Key-i> {do_include_all;break}
bind $ui_comm <$M1B-Key-I> {do_include_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 $ui_diff <$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 .   <Destroy> do_quit
bind all <Key-F5> do_rescan
bind all <$M1B-Key-r> do_rescan
bind all <$M1B-Key-R> do_rescan
bind .   <$M1B-Key-s> do_signoff
bind .   <$M1B-Key-S> do_signoff
bind .   <$M1B-Key-i> do_include_all
bind .   <$M1B-Key-I> do_include_all
bind .   <$M1B-Key-Return> do_commit
bind all <$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]}
foreach i [list $ui_index $ui_other] {
	bind $i <Button-1> {click %W %x %y 1 %X %Y; break}
	bind $i <ButtonRelease-1> {unclick %W %x %y; break}
	bind_button3 $i {click %W %x %y 3 %X %Y; break}
}
unset i

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

wm title . "$appname ([file normalize [file dirname $gitdir]])"
focus -force $ui_comm
if {!$single_commit} {
	load_all_remotes
	populate_remote_menu .mbar.fetch From fetch_from
	populate_remote_menu .mbar.push To push_to
	populate_pull_menu .mbar.pull
}
after 1 update_status