From b9e7efb8b5f7d424466dd1ce61fd20658f60543f Mon Sep 17 00:00:00 2001
From: "Shawn O. Pearce" <spearce@spearce.org>
Date: Thu, 17 May 2007 18:01:50 -0400
Subject: git-gui: Gracefully handle bad TCL_PATH at compile time

Petr Baudis pointed out the main git.git repository's Makefile dies
now if git-gui 0.7.0-rc1 or later is being used and TCL_PATH was not
set to a working tclsh program path.  This breaks people who may have
a working build configuration today and suddenly upgrade to the latest
git release.

The tclIndex is required for git-gui to load its associated lib files,
but using the Tcl auto_load procedure to source only the files we need
is a performance optimization.  We can emulate the auto_load by just
source'ing every file in that directory, assuming we source class.tcl
first to initialize our crude class system.

Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
---
 Makefile | 19 ++++++++++++++++---
 1 file changed, 16 insertions(+), 3 deletions(-)

(limited to 'Makefile')

diff --git a/Makefile b/Makefile
index e73b6453d9..ee564219c0 100644
--- a/Makefile
+++ b/Makefile
@@ -11,6 +11,7 @@ SCRIPT_SH = git-gui.sh
 GITGUI_BUILT_INS = git-citool
 ALL_PROGRAMS = $(GITGUI_BUILT_INS) $(patsubst %.sh,%,$(SCRIPT_SH))
 ALL_LIBFILES = $(wildcard lib/*.tcl)
+PRELOAD_FILES = lib/class.tcl
 
 ifndef SHELL_PATH
 	SHELL_PATH = /bin/sh
@@ -32,6 +33,7 @@ ifndef V
 	QUIET_GEN      = @echo '   ' GEN $@;
 	QUIET_BUILT_IN = @echo '   ' BUILTIN $@;
 	QUIET_INDEX    = @echo '   ' INDEX $(dir $@);
+	QUIET_2DEVNULL = 2>/dev/null
 endif
 
 TCL_PATH   ?= tclsh
@@ -45,6 +47,7 @@ endif
 DESTDIR_SQ = $(subst ','\'',$(DESTDIR))
 gitexecdir_SQ = $(subst ','\'',$(gitexecdir))
 SHELL_PATH_SQ = $(subst ','\'',$(SHELL_PATH))
+TCL_PATH_SQ = $(subst ','\'',$(TCL_PATH))
 TCLTK_PATH_SQ = $(subst ','\'',$(TCLTK_PATH))
 
 libdir   ?= $(sharedir)/git-gui/lib
@@ -64,16 +67,26 @@ $(GITGUI_BUILT_INS): git-gui
 	$(QUIET_BUILT_IN)rm -f $@ && ln git-gui $@
 
 lib/tclIndex: $(ALL_LIBFILES)
-	$(QUIET_INDEX)echo \
-	  source lib/class.tcl \; \
+	$(QUIET_INDEX)if echo \
+	  $(foreach p,$(PRELOAD_FILES),source $p\;) \
 	  auto_mkindex lib '*.tcl' \
-	| $(TCL_PATH)
+	| $(TCL_PATH) $(QUIET_2DEVNULL); then : ok; \
+	else \
+	 echo 1>&2 "    * $(TCL_PATH) failed; using unoptimized loading"; \
+	 rm -f $@ ; \
+	 echo '# Autogenerated by git-gui Makefile' >$@ && \
+	 echo >>$@ && \
+	 $(foreach p,$(PRELOAD_FILES) $(ALL_LIBFILES),echo '$(subst lib/,,$p)' >>$@ &&) \
+	 echo >>$@ ; \
+	fi
 
 # These can record GITGUI_VERSION
 $(patsubst %.sh,%,$(SCRIPT_SH)): GIT-VERSION-FILE GIT-GUI-VARS
+lib/tclIndex: GIT-GUI-VARS
 
 TRACK_VARS = \
 	$(subst ','\'',SHELL_PATH='$(SHELL_PATH_SQ)') \
+	$(subst ','\'',TCL_PATH='$(TCL_PATH_SQ)') \
 	$(subst ','\'',TCLTK_PATH='$(TCLTK_PATH_SQ)') \
 	$(subst ','\'',libdir='$(libdir_SQ)') \
 #end TRACK_VARS
-- 
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