#!/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.

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

set single_commit 0
set status_active 0
set diff_active 0
set checkin_active 0
set commit_active 0
set update_index_fd {}

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 == {none}} {
		set index_lock_type $type
		foreach w $disable_on_lock {
			uplevel #0 $w disabled
		}
		return 1
	} elseif {$index_lock_type == {begin-update} && $type == {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

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

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

	array unset file_states
	foreach w [list $ui_index $ui_other] {
		$w conf -state normal
		$w delete 0.0 end
		$w conf -state disabled
	}

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

	set status_active 1
	set ui_status_value {Refreshing file status...}
	set fd_rf [open "| git update-index -q --unmerged --refresh" r]
	fconfigure $fd_rf -blocking 0 -translation binary
	fileevent $fd_rf readable [list read_refresh $fd_rf $final]
}

proc read_refresh {fd final} {
	global gitdir PARENT commit_type
	global ui_index ui_other ui_status_value ui_comm
	global status_active file_states

	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 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 pck [split $buf_rdi "\0"]
	set buf_rdi [lindex $pck end]
	foreach {m p} [lrange $pck 0 end-1] {
		if {$m != {} && $p != {}} {
			display_file $p [string index $m end]_
		}
	}
	status_eof $fd buf_rdi $final
}

proc read_diff_files {fd final} {
	global buf_rdf

	append buf_rdf [read $fd]
	set pck [split $buf_rdf "\0"]
	set buf_rdf [lindex $pck end]
	foreach {m p} [lrange $pck 0 end-1] {
		if {$m != {} && $p != {}} {
			display_file $p _[string index $m end]
		}
	}
	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 $buf
	global ui_fname_value ui_status_value file_states

	if {[eof $fd]} {
		set $buf {}
		close $fd
		if {[incr status_active -1] == 0} {
			unlock_index

			set ui_status_value $final
			if {$ui_fname_value != {} && [array names file_states \
				-exact $ui_fname_value] != {}}  {
				show_diff $ui_fname_value
			} else {
				clear_diff
			}
		}
	}
}

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

proc clear_diff {} {
	global ui_diff ui_fname_value ui_fstatus_value

	$ui_diff conf -state normal
	$ui_diff delete 0.0 end
	$ui_diff conf -state disabled
	set ui_fname_value {}
	set ui_fstatus_value {}
}

proc show_diff {path} {
	global file_states PARENT diff_3way diff_active
	global ui_diff ui_fname_value ui_fstatus_value ui_status_value

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

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

	set cmd [list | git diff-index -p $PARENT -- $path]
	switch $m {
	AM {
	}
	MM {
		set cmd [list | git diff-index -p -c $PARENT $path]
	}
	_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 $path"
			error_popup "Error loading file:\n$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
	}
	}

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

	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.}
	}
}

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

proc load_last_commit {} {
	global HEAD PARENT commit_type ui_comm

	if {$commit_type == {amend}} return
	if {$commit_type != {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 $fd
		} err]} {
		error_popup "Error loading commit data for amend:\n$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
		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 commit_active ui_status_value
	global ui_comm

	if {$commit_active || ![lock_index update]} return

	# -- Our in memory state should match the repository.
	#
	repository_state curHEAD cur_type
	if {$commit_type == {amend} 
		&& $cur_type == {normal}
		&& $curHEAD == $HEAD} {
	} elseif {$commit_type != $cur_type || $HEAD != $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 $path has merge conflicts.
You must resolve them and check the file in before committing.
"
			unlock_index
			return
		}
		default {
			error_popup "Unknown file state [lindex $s 0] detected.

File $path cannot be committed by this program.
"
		}
		}
	}
	if {!$files_ready} {
		error_popup {No checked-in files to commit.

You must check-in 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 == {}} {
		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) == {windows} && [file isfile $pchook]} {
		set pchook [list sh -c \
			"if test -x \"$pchook\"; then exec \"$pchook\"; fi"]
	} elseif {[file executable $pchook]} {
		set pchook [list $pchook]
	} else {
		set pchook {}
	}
	if {$pchook != {} && [catch {eval exec $pchook} err]} {
		hook_failed_popup pre-commit $err
		unlock_index
		return
	}

	# -- Write the tree in the background.
	#
	set commit_active 1
	set ui_status_value {Committing changes...}

	set fd_wt [open "| git write-tree" r]
	fileevent $fd_wt readable [list commit_stage2 $fd_wt $curHEAD $msg]
}

proc commit_stage2 {fd_wt curHEAD msg} {
	global single_commit gitdir PARENT commit_type
	global commit_active ui_status_value ui_comm

	gets $fd_wt tree_id
	close $fd_wt

	if {$tree_id == {}} {
		error_popup "write-tree failed"
		set commit_active 0
		set ui_status_value {Commit failed.}
		unlock_index
		return
	}

	# -- Create the commit.
	#
	set cmd [list git commit-tree $tree_id]
	if {$PARENT != {}} {
		lappend cmd -p $PARENT
	}
	if {$commit_type == {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 $fd_mh
			} err]} {
			error_popup "Loading MERGE_HEADs failed:\n$err"
			set commit_active 0
			set ui_status_value {Commit failed.}
			unlock_index
			return
		}
	}
	if {$PARENT == {}} {
		# git commit-tree writes to stderr during initial commit.
		lappend cmd 2>/dev/null
	}
	lappend cmd << $msg
	if {[catch {set cmt_id [eval exec $cmd]} err]} {
		error_popup "commit-tree failed:\n$err"
		set commit_active 0
		set ui_status_value {Commit failed.}
		unlock_index
		return
	}

	# -- Update the HEAD ref.
	#
	set reflogm commit
	if {$commit_type != {normal}} {
		append reflogm " ($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 $cmd} err]} {
		error_popup "update-ref failed:\n$err"
		set commit_active 0
		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}
	}

	$ui_comm delete 0.0 end
	$ui_comm edit modified false

	if {$single_commit} do_quit

	set commit_type {}
	set commit_active 0
	set HEAD $cmt_id
	set PARENT $cmt_id
	unlock_index
	update_status "Changes committed as $cmt_id."
}

######################################################################
##
## 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 -v
	lappend cmd $remote
	console_exec $w $cmd
}

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

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

proc mapcol {state path} {
	global all_cols

	if {[catch {set r $all_cols($state)}]} {
		puts "error: no column for state={$state} $path"
		return o
	}
	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 bsearch {w path} {
	set hi [expr [lindex [split [$w index end] .] 0] - 2]
	if {$hi == 0} {
		return -1
	}
	set lo 0
	while {$lo < $hi} {
		set mi [expr [expr $lo + $hi] / 2]
		set ti [expr $mi + 1]
		set cmp [string compare [$w get $ti.1 $ti.end] $path]
		if {$cmp < 0} {
			set lo $ti
		} elseif {$cmp == 0} {
			return $mi
		} else {
			set hi $mi
		}
	}
	return -[expr $lo + 1]
}

proc merge_state {path state} {
	global file_states

	if {[array names file_states -exact $path] == {}}  {
		set o __
		set s [list $o none none]
	} else {
		set s $file_states($path)
		set o [lindex $s 0]
	}

	set m [lindex $s 0]
	if {[string index $state 0] == "_"} {
		set state [string index $m 0][string index $state 1]
	} elseif {[string index $state 0] == "*"} {
		set state _[string index $state 1]
	}

	if {[string index $state 1] == "_"} {
		set state [string index $state 0][string index $m 1]
	} elseif {[string index $state 1] == "*"} {
		set state [string index $state 0]_
	}

	set file_states($path) [lreplace $s 0 0 $state]
	return $o
}

proc display_file {path state} {
	global ui_index ui_other file_states

	set old_m [merge_state $path $state]
	set s $file_states($path)
	set m [lindex $s 0]

	if {[mapcol $m $path] == "o"} {
		set ii 1
		set ai 2
		set iw $ui_index
		set aw $ui_other
	} else {
		set ii 2
		set ai 1
		set iw $ui_other
		set aw $ui_index
	}

	set d [lindex $s $ii]
	if {$d != "none"} {
		set lno [bsearch $iw $path]
		if {$lno >= 0} {
			incr lno
			$iw conf -state normal
			$iw delete $lno.0 [expr $lno + 1].0
			$iw conf -state disabled
			set s [lreplace $s $ii $ii none]
		}
	}

	set d [lindex $s $ai]
	if {$d == "none"} {
		set lno [expr abs([bsearch $aw $path] + 1) + 1]
		$aw conf -state normal
		set ico [$aw image create $lno.0 \
			-align center -padx 5 -pady 1 \
			-image [mapicon $m $path]]
		$aw insert $lno.1 "$path\n"
		$aw conf -state disabled
		set file_states($path) [lreplace $s $ai $ai [list $ico]]
	} elseif {[mapicon $m $path] != [mapicon $old_m $path]} {
		set ico [lindex $d 0]
		$aw image conf $ico -image [mapicon $m $path]
	}
}

proc with_update_index {body} {
	global update_index_fd

	if {$update_index_fd == {}} {
		if {![lock_index update]} return
		set update_index_fd [open \
			"| git update-index --add --remove -z --stdin" \
			w]
		fconfigure $update_index_fd -translation binary
		uplevel 1 $body
		close $update_index_fd
		set update_index_fd {}
		unlock_index
	} else {
		uplevel 1 $body
	}
}

proc update_index {path} {
	global update_index_fd

	if {$update_index_fd == {}} {
		error {not in with_update_index}
	} else {
		puts -nonewline $update_index_fd "$path\0"
	}
}

proc toggle_mode {path} {
	global file_states ui_fname_value

	set s $file_states($path)
	set m [lindex $s 0]

	switch -- $m {
	AM -
	_O {set new A*}
	_M -
	MM {set new M*}
	AD -
	_D {set new D*}
	default {return}
	}

	with_update_index {update_index $path}
	display_file $path $new
	if {$ui_fname_value == $path} {
		show_diff $path
	}
}

######################################################################
##
## config (fetch push pull)

proc load_all_remotes {} {
	global gitdir all_remotes

	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 -directory $rm_dir * *]]
	}

	set fd_rc [open "| git repo-config --list" r]
	while {[gets $fd_rc line] >= 0} {
		if {[regexp ^remote\.(.*)\.url= $line line name]} {
			lappend all_remotes $name
		}
	}
	close $fd_rc

	set all_remotes [lsort -unique $all_remotes]
}

proc populate_remote_menu {m pfx op} {
	global gitdir all_remotes mainfont

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

######################################################################
##
## 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 max_status_desc 0
foreach i {
		{__ i plain    "Unmodified"}
		{_M i mod      "Modified"}
		{M_ i fulltick "Checked in"}
		{MM i parttick "Partially checked in"}

		{_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]]
	}
	set all_cols([lindex $i 0]) [lindex $i 1]
	set all_icons([lindex $i 0]) file_[lindex $i 2]
	set all_descs([lindex $i 0]) [lindex $i 3]
}
unset filemask i

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

proc error_popup {msg} {
	set w .error
	toplevel $w
	wm transient $w .
	show_msg $w $w $msg
}

proc show_msg {w top msg} {
	global gitdir appname mainfont

	message $w.m -text $msg -justify left -aspect 400
	pack $w.m -side top -fill x -padx 5 -pady 10
	button $w.ok -text OK \
		-width 15 \
		-font $mainfont \
		-command "destroy $top"
	pack $w.ok -side bottom
	bind $top <Visibility> "grab $top; focus $top"
	bind $top <Key-Return> "destroy $top"
	wm title $top "error: $appname ([file normalize [file dirname $gitdir]])"
	tkwait window $top
}

proc hook_failed_popup {hook msg} {
	global gitdir mainfont difffont appname

	set w .hookfail
	toplevel $w
	wm transient $w .

	frame $w.m
	label $w.m.l1 -text "$hook hook failed:" \
		-anchor w \
		-justify left \
		-font [concat $mainfont bold]
	text $w.m.t \
		-background white -borderwidth 1 \
		-relief sunken \
		-width 80 -height 10 \
		-font $difffont \
		-yscrollcommand [list $w.m.sby set]
	label $w.m.l2 \
		-text {You must correct the above errors before committing.} \
		-anchor w \
		-justify left \
		-font [concat $mainfont bold]
	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 $mainfont \
		-command "destroy $w"
	pack $w.ok -side bottom

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

set next_console_id 0

proc new_console {short_title long_title} {
	global next_console_id console_cr
	global gitdir appname mainfont difffont

	set w .console[incr next_console_id]
	set console_cr($w) 1.0
	toplevel $w
	frame $w.m
	label $w.m.l1 -text "$long_title:" \
		-anchor w \
		-justify left \
		-font [concat $mainfont bold]
	text $w.m.t \
		-background white -borderwidth 1 \
		-relief sunken \
		-width 80 -height 10 \
		-font $difffont \
		-state disabled \
		-yscrollcommand [list $w.m.sby set]
	scrollbar $w.m.sby -command [list $w.m.t yview]
	pack $w.m.l1 -side top -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

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

	bind $w <Visibility> "focus $w"
	bind $w <Destroy> break
	wm title $w "$appname ([file dirname [file normalize [file dirname $gitdir]]]): $short_title"
	return $w
}

proc console_exec {w cmd} {
	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) == {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]
}

proc console_read {w fd} {
	global console_cr

	$w.m.t conf -state normal
	set buf [read $fd]
	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

	if {[eof $fd]} {
		close $fd
		$w.ok conf -text Close
		$w.ok conf -state normal
		array unset console_cr $w
	}
}

######################################################################
##
## 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 == $starting_gitk_msg} {
			set ui_status_value {Ready.}
		}
	}

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

proc do_quit {} {
	global gitdir ui_comm

	set save [file join $gitdir GITGUI_MSG]
	set msg [string trim [$ui_comm get 0.0 end]]
	if {[$ui_comm edit modified] && $msg != {}} {
		catch {
			set fd [open $save w]
			puts $fd [string trim [$ui_comm get 0.0 end]]
			close $fd
		}
	} elseif {$msg == {} && [file exists $save]} {
		file delete $save
	}

	destroy .
}

proc do_rescan {} {
	update_status
}

proc do_checkin_all {} {
	global checkin_active ui_status_value

	if {$checkin_active || ![lock_index begin-update]} return

	set checkin_active 1
	set ui_status_value {Checking in all files...}
	after 1 {
		with_update_index {
			foreach path [array names file_states] {
				set s $file_states($path)
				set m [lindex $s 0]
				switch -- $m {
				AM -
				MM -
				_M -
				_D {toggle_mode $path}
				}
			}
		}
		set checkin_active 0
		set ui_status_value {Ready.}
	}
}

proc do_signoff {} {
	global ui_comm

	catch {
		set me [exec git var GIT_COMMITTER_IDENT]
		if {[regexp {(.*) [0-9]+ [-+0-9]+$} $me me name]} {
			set str "Signed-off-by: $name"
			if {[$ui_comm get {end -1c linestart} {end -1c}] != $str} {
				$ui_comm insert end "\n"
				$ui_comm insert end $str
				$ui_comm see end
			}
		}
	}
}

proc do_amend_last {} {
	load_last_commit
}

proc do_commit {} {
	commit_tree
}

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

	set pos [split [$w index @$x,$y] .]
	set lno [lindex $pos 0]
	set col [lindex $pos 1]
	set path [$w get $lno.1 $lno.end]
	if {$path == {}} return

	if {$col > 0 && $shift == 1} {
		$ui_index tag remove in_diff 0.0 end
		$ui_other tag remove in_diff 0.0 end
		$w tag add in_diff $lno.0 [expr $lno + 1].0
		show_diff $path
	}
}

proc unclick {w x y} {
	set pos [split [$w index @$x,$y] .]
	set lno [lindex $pos 0]
	set col [lindex $pos 1]
	set path [$w get $lno.1 $lno.end]
	if {$path == {}} return

	if {$col == 0} {
		toggle_mode $path
	}
}

######################################################################
##
## ui init

set mainfont {Helvetica 10}
set difffont {Courier 10}
set maincursor [. cget -cursor]

switch -glob -- "$tcl_platform(platform),$tcl_platform(os)" {
windows,*   {set M1B Control; set M1T Ctrl}
unix,Darwin {set M1B M1; set M1T Cmd}
default     {set M1B M1; set M1T M1}
}

# -- Menu Bar
menu .mbar -tearoff 0
.mbar add cascade -label Project -menu .mbar.project
.mbar add cascade -label Commit -menu .mbar.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 $mainfont
.mbar.project add command -label Quit \
	-command do_quit \
	-accelerator $M1T-Q \
	-font $mainfont

# -- Commit Menu
menu .mbar.commit
.mbar.commit add command -label Rescan \
	-command do_rescan \
	-accelerator F5 \
	-font $mainfont
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 $mainfont
lappend disable_on_lock \
	[list .mbar.commit entryconf [.mbar.commit index last] -state]
.mbar.commit add command -label {Check-in All Files} \
	-command do_checkin_all \
	-accelerator $M1T-U \
	-font $mainfont
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 $mainfont
.mbar.commit add command -label Commit \
	-command do_commit \
	-accelerator $M1T-Return \
	-font $mainfont
lappend disable_on_lock \
	[list .mbar.commit entryconf [.mbar.commit index last] -state]

# -- 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
set ui_index .vpane.files.index.list
frame .vpane.files.index -height 100 -width 400
label .vpane.files.index.title -text {Modified Files} \
	-background green \
	-font $mainfont
text $ui_index -background white -borderwidth 0 \
	-width 40 -height 10 \
	-font $mainfont \
	-yscrollcommand {.vpane.files.index.sb set} \
	-cursor $maincursor \
	-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
set ui_other .vpane.files.other.list
frame .vpane.files.other -height 100 -width 100
label .vpane.files.other.title -text {Untracked Files} \
	-background red \
	-font $mainfont
text $ui_other -background white -borderwidth 0 \
	-width 40 -height 10 \
	-font $mainfont \
	-yscrollcommand {.vpane.files.other.sb set} \
	-cursor $maincursor \
	-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 [concat $mainfont bold]
$ui_other tag conf in_diff -font [concat $mainfont bold]

# -- Diff Header
set ui_fname_value {}
set ui_fstatus_value {}
frame .vpane.diff -height 200 -width 400
frame .vpane.diff.header
label .vpane.diff.header.l1 -text {File:} -font $mainfont
label .vpane.diff.header.l2 -textvariable ui_fname_value \
	-anchor w \
	-justify left \
	-font $mainfont
label .vpane.diff.header.l3 -text {Status:} -font $mainfont
label .vpane.diff.header.l4 -textvariable ui_fstatus_value \
	-width $max_status_desc \
	-anchor w \
	-justify left \
	-font $mainfont
pack .vpane.diff.header.l1 -side left
pack .vpane.diff.header.l2 -side left -fill x
pack .vpane.diff.header.l4 -side right
pack .vpane.diff.header.l3 -side right

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

$ui_diff tag conf dm -foreground red
$ui_diff tag conf dp -foreground blue
$ui_diff tag conf da -font [concat $difffont bold]
$ui_diff tag conf di -foreground "#00a000"
$ui_diff tag conf dni -foreground "#a000a0"
$ui_diff tag conf bold -font [concat $difffont bold]

# -- Commit Area
frame .vpane.commarea -height 170
.vpane add .vpane.commarea -stick nsew

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

button .vpane.commarea.buttons.rescan -text {Rescan} \
	-command do_rescan \
	-font $mainfont
pack .vpane.commarea.buttons.rescan -side top -fill x
lappend disable_on_lock {.vpane.commarea.buttons.rescan conf -state}

button .vpane.commarea.buttons.amend -text {Amend Last} \
	-command do_amend_last \
	-font $mainfont
pack .vpane.commarea.buttons.amend -side top -fill x
lappend disable_on_lock {.vpane.commarea.buttons.amend conf -state}

button .vpane.commarea.buttons.ciall -text {Check-in All} \
	-command do_checkin_all \
	-font $mainfont
pack .vpane.commarea.buttons.ciall -side top -fill x
lappend disable_on_lock {.vpane.commarea.buttons.ciall conf -state}

button .vpane.commarea.buttons.signoff -text {Sign Off} \
	-command do_signoff \
	-font $mainfont
pack .vpane.commarea.buttons.signoff -side top -fill x

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

# -- Commit Message Buffer
frame .vpane.commarea.buffer
set ui_comm .vpane.commarea.buffer.t
set ui_coml .vpane.commarea.buffer.l
label $ui_coml -text {Commit Message:} \
	-anchor w \
	-justify left \
	-font $mainfont
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 \
	-relief sunken \
	-width 75 -height 10 -wrap none \
	-font $difffont \
	-yscrollcommand {.vpane.commarea.buffer.sby set} \
	-cursor $maincursor
scrollbar .vpane.commarea.buffer.sby -command [list $ui_comm yview]
pack $ui_coml -side top -fill x
pack .vpane.commarea.buffer.sby -side right -fill y
pack $ui_comm -side left -fill y
pack .vpane.commarea.buffer -side left -fill y

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

# -- Key Bindings
bind $ui_comm <$M1B-Key-Return> {do_commit;break}
bind . <Destroy> do_quit
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 . <$M1B-Key-u> do_checkin_all
bind . <$M1B-Key-U> do_checkin_all
bind . <$M1B-Key-Return> do_commit
bind . <$M1B-Key-q> do_quit
bind . <$M1B-Key-Q> do_quit
foreach i [list $ui_index $ui_other] {
	bind $i <Button-1> {click %W %x %y 1 %X %Y; break}
	bind $i <Button-3> {click %W %x %y 3 %X %Y; break}
	bind $i <ButtonRelease-1> {unclick %W %x %y; break}
}
unset i M1B M1T

######################################################################
##
## main

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

if {[catch {set cdup [exec git rev-parse --show-cdup]} err]} {
	show_msg {} . "Cannot find the git directory: $err"
	exit 1
}
if {$cdup != ""} {
	cd $cdup
}
unset cdup

if {[catch {set gitdir [exec git rev-parse --git-dir]} err]} {
	show_msg {} . "Cannot find the git directory: $err"
	exit 1
}

if {$appname == {git-citool}} {
	set single_commit 1
}

wm title . "$appname ([file normalize [file dirname $gitdir]])"
focus -force $ui_comm
load_all_remotes
populate_remote_menu .mbar.fetch From fetch_from
populate_remote_menu .mbar.push To push_to
update_status