git-gui: Modified makefile to embed version into git-gui script.

We want to embed the version of git-gui directly into the script file,
so that we can display it properly in the about dialog.  Consequently
I've refactored the Makefile process to act like the one in core git.git
with regards to shell scripts, allowing git-gui to be constructed by a
sed replacement performed on git-gui.sh.

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

.gitignore

@@ -0,0 +1,2 @@
+git-citool
+git-gui

Makefile

@@ -1,4 +1,13 @@
-all: git-gui
+all::
+
+SCRIPT_SH = git-gui.sh
+GITGUI_BUILT_INS = git-citool
+ALL_PROGRAMS = $(GITGUI_BUILT_INS) $(patsubst %.sh,%,$(SCRIPT_SH))
+GITGUI_VERSION := $(shell git describe)
+
+ifndef SHELL_PATH
+	SHELL_PATH = /bin/sh
+endif
 
 gitexecdir := $(shell git --exec-path)
 INSTALL = install
@@ -6,9 +15,25 @@ INSTALL = install
 DESTDIR_SQ = $(subst ','\'',$(DESTDIR))
 gitexecdir_SQ = $(subst ','\'',$(gitexecdir))
 
-GITGUI_BUILTIN = git-citool
+SHELL_PATH_SQ = $(subst ','\'',$(SHELL_PATH))
+
+$(patsubst %.sh,%,$(SCRIPT_SH)) : % : %.sh
+	rm -f $@ $@+
+	sed -e '1s|#!.*/sh|#!$(SHELL_PATH_SQ)|' \
+		-e 's/@@GITGUI_VERSION@@/$(GITGUI_VERSION)/g' \
+		$@.sh >$@+
+	chmod +x $@+
+	mv $@+ $@
+
+$(GITGUI_BUILT_INS): git-gui
+	rm -f $@ && ln git-gui $@
+
+all:: $(ALL_PROGRAMS)
 
 install: all
 	$(INSTALL) -d -m755 '$(DESTDIR_SQ)$(gitexecdir_SQ)'
 	$(INSTALL) git-gui '$(DESTDIR_SQ)$(gitexecdir_SQ)'
-	$(foreach p,$(GITGUI_BUILTIN), rm -f '$(DESTDIR_SQ)$(gitexecdir_SQ)/$p' && ln '$(DESTDIR_SQ)$(gitexecdir_SQ)/git-gui' '$(DESTDIR_SQ)$(gitexecdir_SQ)/$p' ;)
+	$(foreach p,$(GITGUI_BUILT_INS), rm -f '$(DESTDIR_SQ)$(gitexecdir_SQ)/$p' && ln '$(DESTDIR_SQ)$(gitexecdir_SQ)/git-gui' '$(DESTDIR_SQ)$(gitexecdir_SQ)/$p' ;)
+
+clean::
+	rm -f $(ALL_PROGRAMS)

git-citool

@@ -1 +0,0 @@
-git-gui

git-gui.sh

@@ -3,7 +3,7 @@
 exec wish "$0" -- "$@"
 
 set copyright {
-Copyright Š 2006 Shawn Pearce, Paul Mackerras.
+Copyright © 2006, 2007 Shawn Pearce, Paul Mackerras.
 
 All rights reserved.
 
@@ -11,6 +11,7 @@ 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 appvers {@@GITGUI_VERSION@@}
 set appname [lindex [file split $argv0] end]
 set gitdir {}