git-gui: Hide commit related UI during citool --nocommit

If the user started git-gui as "git citool --nocommit" then they
don't need the new commit / amend commit radio buttons, or the sign
off button in the UI.  Rather than use up space with options the
user cannot activate they are simply not installed into the UI.

Signed-off-by: Shawn O. Pearce <spearce@spearce.org>

git-gui.sh

@@ -2271,6 +2271,7 @@ proc commit_btn_caption {} {
 if {[is_enabled multicommit] || [is_enabled singlecommit]} {
 	menu .mbar.commit
 
+	if {![is_enabled nocommit]} {
 		.mbar.commit add radiobutton \
 			-label [mc "New Commit"] \
 			-command do_select_commit_type \
@@ -2288,6 +2289,7 @@ if {[is_enabled multicommit] || [is_enabled singlecommit]} {
 			[list .mbar.commit entryconf [.mbar.commit index last] -state]
 
 		.mbar.commit add separator
+	}
 
 	.mbar.commit add command -label [mc Rescan] \
 		-command ui_do_rescan \
@@ -2329,9 +2331,11 @@ if {[is_enabled multicommit] || [is_enabled singlecommit]} {
 
 	.mbar.commit add separator
 
+	if {![is_enabled nocommit]} {
 		.mbar.commit add command -label [mc "Sign Off"] \
 			-command do_signoff \
 			-accelerator $M1T-S
+	}
 
 	.mbar.commit add command -label [commit_btn_caption] \
 		-command do_commit \
@@ -2657,9 +2661,11 @@ pack .vpane.lower.commarea.buttons.incall -side top -fill x
 lappend disable_on_lock \
 	{.vpane.lower.commarea.buttons.incall conf -state}
 
+if {![is_enabled nocommit]} {
 	button .vpane.lower.commarea.buttons.signoff -text [mc "Sign Off"] \
 		-command do_signoff
 	pack .vpane.lower.commarea.buttons.signoff -side top -fill x
+}
 
 button .vpane.lower.commarea.buttons.commit -text [commit_btn_caption] \
 	-command do_commit
@@ -2667,15 +2673,10 @@ pack .vpane.lower.commarea.buttons.commit -side top -fill x
 lappend disable_on_lock \
 	{.vpane.lower.commarea.buttons.commit conf -state}
 
+if {![is_enabled nocommit]} {
 	button .vpane.lower.commarea.buttons.push -text [mc Push] \
 		-command do_push_anywhere
 	pack .vpane.lower.commarea.buttons.push -side top -fill x
-
-if {[is_enabled nocommitmsg]} {
-	.vpane.lower.commarea.buttons.signoff configure -state disabled
-}
-if {[is_enabled nocommit]} {
-	.vpane.lower.commarea.buttons.push configure -state disabled
 }
 
 # -- Commit Message Buffer
@@ -2684,6 +2685,8 @@ frame .vpane.lower.commarea.buffer
 frame .vpane.lower.commarea.buffer.header
 set ui_comm .vpane.lower.commarea.buffer.t
 set ui_coml .vpane.lower.commarea.buffer.header.l
+
+if {![is_enabled nocommit]} {
 	radiobutton .vpane.lower.commarea.buffer.header.new \
 		-text [mc "New Commit"] \
 		-command do_select_commit_type \
@@ -2698,6 +2701,8 @@ radiobutton .vpane.lower.commarea.buffer.header.amend \
 		-value amend
 	lappend disable_on_lock \
 		[list .vpane.lower.commarea.buffer.header.amend conf -state]
+}
+
 label $ui_coml \
 	-anchor w \
 	-justify left
@@ -2715,8 +2720,11 @@ proc trace_commit_type {varname args} {
 }
 trace add variable commit_type write trace_commit_type
 pack $ui_coml -side left -fill x
+
+if {![is_enabled nocommit]} {
 	pack .vpane.lower.commarea.buffer.header.amend -side right
 	pack .vpane.lower.commarea.buffer.header.new -side right
+}
 
 text $ui_comm -background white -foreground black \
 	-borderwidth 1 \