From 81b63c707ed5962d45bd575c946a7127c19a3e35 Mon Sep 17 00:00:00 2001
From: Eygene Ryabinkin <rea-git@codelabs.ru>
Date: Wed, 28 Mar 2007 04:12:07 -0700
Subject: [PATCH] Add --with-tcltk and --without-tcltk to configure.

--with-tcltk enables the search of the Tcl/Tk interpreter. If no
interpreter is found then Tcl/Tk dependend parts are disabled.

--without-tcltk unconditionally disables Tcl/Tk dependent parts.

The original behaviour is not changed: bare './configure' just
installs the Tcl/Tk part doing no checks for the interpreter.

Signed-off-by: Eygene Ryabinkin <rea-git@codelabs.ru>
---
 Makefile      | 12 +++++++++++-
 config.mak.in |  1 +
 configure.ac  | 26 ++++++++++++++++++++++++++
 3 files changed, 38 insertions(+), 1 deletion(-)

diff --git a/Makefile b/Makefile
index 0797ad4a99..da086a7fed 100644
--- a/Makefile
+++ b/Makefile
@@ -112,6 +112,10 @@ all::
 #
 # Define NO_TCLTK if you do not want Tcl/Tk GUI.
 #
+# The TCLTK_PATH variable governs the location of the Tck/Tk interpreter.
+# If not set it defaults to the bare 'wish'. If it is set to the empty
+# string then NO_TCLTK will be forced (this is used by configure script).
+#
 
 GIT-VERSION-FILE: .FORCE-GIT-VERSION-FILE
 	@$(SHELL_PATH) ./GIT-VERSION-GEN
@@ -161,6 +165,7 @@ AR = ar
 TAR = tar
 INSTALL = install
 RPMBUILD = rpmbuild
+TCLTK_PATH = wish
 
 # sparse is architecture-neutral, which means that we need to tell it
 # explicitly what architecture to check for. Fix this up for yours..
@@ -616,6 +621,10 @@ ifdef NO_PERL_MAKEMAKER
 	export NO_PERL_MAKEMAKER
 endif
 
+ifeq ($(TCLTK_PATH),)
+NO_TCLTK=NoThanks
+endif
+
 QUIET_SUBDIR0  = $(MAKE) -C # space to separate -C and subdir
 QUIET_SUBDIR1  =
 
@@ -654,6 +663,7 @@ prefix_SQ = $(subst ','\'',$(prefix))
 
 SHELL_PATH_SQ = $(subst ','\'',$(SHELL_PATH))
 PERL_PATH_SQ = $(subst ','\'',$(PERL_PATH))
+TCLTK_PATH_SQ = $(subst ','\'',$(TCLTK_PATH))
 
 LIBS = $(GITLIBS) $(EXTLIBS)
 
@@ -676,7 +686,7 @@ endif
 
 all::
 ifndef NO_TCLTK
-	$(QUIET_SUBDIR0)git-gui $(QUIET_SUBDIR1) all
+	$(QUIET_SUBDIR0)git-gui TCLTK_PATH='$(TCLTK_PATH_SQ)' $(QUIET_SUBDIR1) all
 endif
 	$(QUIET_SUBDIR0)perl $(QUIET_SUBDIR1) PERL_PATH='$(PERL_PATH_SQ)' prefix='$(prefix_SQ)' all
 	$(QUIET_SUBDIR0)templates $(QUIET_SUBDIR1)
diff --git a/config.mak.in b/config.mak.in
index 9a578405d8..eb9d7a5549 100644
--- a/config.mak.in
+++ b/config.mak.in
@@ -6,6 +6,7 @@ CFLAGS = @CFLAGS@
 AR = @AR@
 TAR = @TAR@
 #INSTALL = @INSTALL@		# needs install-sh or install.sh in sources
+TCLTK_PATH = @TCLTK_PATH@
 
 prefix = @prefix@
 exec_prefix = @exec_prefix@
diff --git a/configure.ac b/configure.ac
index 3a8e778def..01fa0f0bda 100644
--- a/configure.ac
+++ b/configure.ac
@@ -75,6 +75,14 @@ GIT_ARG_SET_PATH(shell)
 # Define PERL_PATH to provide path to Perl.
 GIT_ARG_SET_PATH(perl)
 #
+# Declare the with-tcltk/without-tcltk options.
+AC_ARG_WITH(tcltk,
+AS_HELP_STRING([--with-tcltk],[use Tcl/Tk GUI (default is YES)])
+AS_HELP_STRING([],[ARG is the full path to the Tcl/Tk interpreter.])
+AS_HELP_STRING([],[Bare --with-tcltk will make the GUI part only if])
+AS_HELP_STRING([],[Tcl/Tk interpreter will be found in a system.]),\
+GIT_PARSE_WITH(tcltk))
+#
 
 
 ## Checks for programs.
@@ -84,6 +92,24 @@ AC_PROG_CC([cc gcc])
 #AC_PROG_INSTALL		# needs install-sh or install.sh in sources
 AC_CHECK_TOOL(AR, ar, :)
 AC_CHECK_PROGS(TAR, [gtar tar])
+# TCLTK_PATH will be set to some value if we want Tcl/Tk
+# or will be empty otherwise.
+if test -z "$NO_TCLTK"; then
+  if test "$with_tcltk" = ""; then
+  # No Tcl/Tk switches given. Do not check for Tcl/Tk, use bare 'wish'.
+    TCLTK_PATH=wish
+    AC_SUBST(TCLTK_PATH)
+  elif test "$with_tcltk" = "yes"; then
+  # Tcl/Tk check requested.
+    AC_CHECK_PROGS(TCLTK_PATH, [wish], )
+  elif test -x "$with_tcltk"; then
+    AC_MSG_RESULT([Using Tcl/Tk interpreter $with_tcltk])
+    TCLTK_PATH="$with_tcltk"
+    AC_SUBST(TCLTK_PATH)
+  else
+    AC_MSG_ERROR([Tcl/Tk interpreter was not found in $with_tcltk])
+  fi
+fi
 
 ## Checks for libraries.
 AC_MSG_NOTICE([CHECKS for libraries])