git-gui: View blame from the command line.

Viewing annotated files is one of those tasks that is relatively
difficult to do in a simple vt100 terminal emulator.  The user
really wants to be able to browse through a lot of information,
and to interact with it by navigating through revisions.

Now users can start our file viewer with annotations by running
'git gui blame commit path', thereby seeing the contents of the
given file at the given commit.  Right now I am being lazy by
not allowing the user to omit the commit name (and have us thus
assume HEAD).
Signed-off-by: NShawn O. Pearce <spearce@spearce.org>

git-gui.sh

@@ -319,16 +319,6 @@ set _reponame [lindex [file split \
 	[file normalize [file dirname $_gitdir]]] \
 	end]
 
-enable_option multicommit
-enable_option branch
-enable_option transport
-
-if {[appname] eq {git-citool}} {
-	disable_option multicommit
-	disable_option branch
-	disable_option transport
-}
-
 ######################################################################
 ##
 ## task management
@@ -1307,7 +1297,7 @@ proc commit_committree {fd_wt curHEAD msg} {
 	$ui_comm edit reset
 	$ui_comm edit modified false
 
-	if {![is_enabled multicommit]} do_quit
+	if {[is_enabled singlecommit]} do_quit
 
 	# -- Update in memory status
 	#
@@ -3236,12 +3226,17 @@ proc read_ls_tree {fd w} {
 proc show_blame {commit path} {
 	global next_browser_id blame_status blame_data
 
-	set w .browser[incr next_browser_id]
+	if {[winfo ismapped .]} {
+		set w .browser[incr next_browser_id]
+		set tl $w
+		toplevel $w
+	} else {
+		set w {}
+		set tl .
+	}
 	set blame_status($w) {Loading current file content...}
 	set texts [list]
 
-	toplevel $w
-
 	label $w.path -text "$commit:$path" \
 		-anchor w \
 		-justify left \
@@ -3399,12 +3394,12 @@ proc show_blame {commit path} {
 
 	set blame_data($w,colors) {}
 
-	bind $w <Visibility> "focus $w"
-	bind $w <Destroy> "
-		array unset blame_status $w
+	bind $tl <Visibility> "focus $tl"
+	bind $tl <Destroy> "
+		array unset blame_status {$w}
 		array unset blame_data $w,*
 	"
-	wm title $w "[appname] ([reponame]): File Viewer"
+	wm title $tl "[appname] ([reponame]): File Viewer"
 
 	set blame_data($w,total_lines) 0
 	set cmd [list git cat-file blob "$commit:$path"]
@@ -3442,7 +3437,9 @@ proc read_blame_catfile {fd w commit path texts w_lno w_file} {
 		lappend cmd $commit -- $path
 		set fd [open "| $cmd" r]
 		fconfigure $fd -blocking 0 -translation lf -encoding binary
-		fileevent $fd readable "read_blame_incremental $fd $w $texts"
+		set handler [list read_blame_incremental $fd $w]
+		append handler " $texts"
+		fileevent $fd readable $handler
 	}
 }
 
@@ -4916,10 +4913,36 @@ set font_descs {
 load_config 0
 apply_config
 
+######################################################################
+##
+## feature option selection
+
+enable_option multicommit
+enable_option branch
+enable_option transport
+
+if {[appname] eq {git-citool}} {
+	enable_option singlecommit
+
+	disable_option multicommit
+	disable_option branch
+	disable_option transport
+}
+
+switch -- [lindex $argv 0] {
+blame {
+	disable_option multicommit
+	disable_option branch
+	disable_option transport
+}
+}
+
 ######################################################################
 ##
 ## ui construction
 
+set ui_comm {}
+
 # -- Menu Bar
 #
 menu .mbar -tearoff 0
@@ -4928,7 +4951,9 @@ menu .mbar -tearoff 0
 if {[is_enabled branch]} {
 	.mbar add cascade -label Branch -menu .mbar.branch
 }
-.mbar add cascade -label Commit -menu .mbar.commit
+if {[is_enabled multicommit] || [is_enabled singlecommit]} {
+	.mbar add cascade -label Commit -menu .mbar.commit
+}
 if {[is_enabled transport]} {
 	.mbar add cascade -label Merge -menu .mbar.merge
 	.mbar add cascade -label Fetch -menu .mbar.fetch
@@ -4944,15 +4969,17 @@ menu .mbar.repository
 	-label {Browse Current Branch} \
 	-command {new_browser $current_branch} \
 	-font font_ui
+trace add variable current_branch write ".mbar.repository entryconf [.mbar.repository index last] -label \"Browse \$current_branch\" ;#"
 .mbar.repository add separator
 
 .mbar.repository add command \
 	-label {Visualize Current Branch} \
-	-command {do_gitk {}} \
+	-command {do_gitk $current_branch} \
 	-font font_ui
+trace add variable current_branch write ".mbar.repository entryconf [.mbar.repository index last] -label \"Visualize \$current_branch\" ;#"
 .mbar.repository add command \
 	-label {Visualize All Branches} \
-	-command {do_gitk {--all}} \
+	-command {do_gitk --all} \
 	-font font_ui
 .mbar.repository add separator
 
@@ -5049,73 +5076,75 @@ if {[is_enabled branch]} {
 
 # -- Commit Menu
 #
-menu .mbar.commit
-
-.mbar.commit add radiobutton \
-	-label {New Commit} \
-	-command do_select_commit_type \
-	-variable selected_commit_type \
-	-value new \
-	-font font_ui
-lappend disable_on_lock \
-	[list .mbar.commit entryconf [.mbar.commit index last] -state]
+if {[is_enabled multicommit] || [is_enabled singlecommit]} {
+	menu .mbar.commit
+
+	.mbar.commit add radiobutton \
+		-label {New Commit} \
+		-command do_select_commit_type \
+		-variable selected_commit_type \
+		-value new \
+		-font font_ui
+	lappend disable_on_lock \
+		[list .mbar.commit entryconf [.mbar.commit index last] -state]
 
-.mbar.commit add radiobutton \
-	-label {Amend Last Commit} \
-	-command do_select_commit_type \
-	-variable selected_commit_type \
-	-value amend \
-	-font font_ui
-lappend disable_on_lock \
-	[list .mbar.commit entryconf [.mbar.commit index last] -state]
+	.mbar.commit add radiobutton \
+		-label {Amend Last Commit} \
+		-command do_select_commit_type \
+		-variable selected_commit_type \
+		-value amend \
+		-font font_ui
+	lappend disable_on_lock \
+		[list .mbar.commit entryconf [.mbar.commit index last] -state]
 
-.mbar.commit add separator
+	.mbar.commit add separator
 
-.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 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 {Add To Commit} \
-	-command do_add_selection \
-	-font font_ui
-lappend disable_on_lock \
-	[list .mbar.commit entryconf [.mbar.commit index last] -state]
+	.mbar.commit add command -label {Add To Commit} \
+		-command do_add_selection \
+		-font font_ui
+	lappend disable_on_lock \
+		[list .mbar.commit entryconf [.mbar.commit index last] -state]
 
-.mbar.commit add command -label {Add All To Commit} \
-	-command do_add_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 {Add All To Commit} \
+		-command do_add_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 {Unstage From Commit} \
-	-command do_unstage_selection \
-	-font font_ui
-lappend disable_on_lock \
-	[list .mbar.commit entryconf [.mbar.commit index last] -state]
+	.mbar.commit add command -label {Unstage From Commit} \
+		-command do_unstage_selection \
+		-font font_ui
+	lappend disable_on_lock \
+		[list .mbar.commit entryconf [.mbar.commit index last] -state]
 
-.mbar.commit add command -label {Revert Changes} \
-	-command do_revert_selection \
-	-font font_ui
-lappend disable_on_lock \
-	[list .mbar.commit entryconf [.mbar.commit index last] -state]
+	.mbar.commit add command -label {Revert Changes} \
+		-command do_revert_selection \
+		-font font_ui
+	lappend disable_on_lock \
+		[list .mbar.commit entryconf [.mbar.commit index last] -state]
 
-.mbar.commit add separator
+	.mbar.commit add separator
 
-.mbar.commit add command -label {Sign Off} \
-	-command do_signoff \
-	-accelerator $M1T-S \
-	-font font_ui
+	.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]
+	.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 {[is_MacOSX]} {
 	# -- Apple Menu (Mac OS X only)
@@ -5218,6 +5247,34 @@ if {$browser ne {}} {
 }
 unset browser doc_path doc_url
 
+# -- Standard bindings
+#
+bind .   <Destroy> do_quit
+bind all <$M1B-Key-q> do_quit
+bind all <$M1B-Key-Q> do_quit
+bind all <$M1B-Key-w> {destroy [winfo toplevel %W]}
+bind all <$M1B-Key-W> {destroy [winfo toplevel %W]}
+
+# -- Not a normal commit type invocation?  Do that instead!
+#
+switch -- [lindex $argv 0] {
+blame {
+	if {[llength $argv] == 3} {
+		set current_branch [lindex $argv 1]
+		show_blame $current_branch [lindex $argv 2]
+		return
+	} else {
+		puts stderr "usage: $argv0 blame commit path"
+		exit 1
+	}
+}
+{} {}
+default {
+	puts stderr "usage: $argv0 \[{blame}\]"
+	exit 1
+}
+}
+
 # -- Branch Control
 #
 frame .branch \
@@ -5714,7 +5771,6 @@ if {[is_enabled branch]} {
 	bind . <$M1B-Key-N> do_create_branch
 }
 
-bind .   <Destroy> do_quit
 bind all <Key-F5> do_rescan
 bind all <$M1B-Key-r> do_rescan
 bind all <$M1B-Key-R> do_rescan
@@ -5723,10 +5779,6 @@ bind .   <$M1B-Key-S> do_signoff
 bind .   <$M1B-Key-i> do_add_all
 bind .   <$M1B-Key-I> do_add_all
 bind .   <$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_workdir] {
 	bind $i <Button-1>       "toggle_or_diff         $i %x %y; break"
 	bind $i <$M1B-Button-1>  "add_one_to_selection   $i %x %y; break"