Add git version handling to build system

When building from a git tree, the version number built into the
binary will be appended with +git-XXXXXXXX.

The base version number is stored in-tree in configure.in and is that
of the last tagged release.  Presumably the git version is later than
the last tag, so we use '+git' rather than '-git' to produce the
correct the lexical sort order -- though of course the sort order
between any two git revisions can only be determined from the git tree
rather than from a lexical sort.

.gitignore

@@ -20,4 +20,6 @@ stamp-h1*
 /ChangeLog
 /INSTALL
 /mtr
+/version.h
+/version.h.tmp
 

Makefile.am

@@ -17,11 +17,24 @@ mtr_SOURCES = mtr.c \
               select.c select.h \
               mtr-curses.h \
               mtr-gtk.h
+nodist_mtr_SOURCES = version.h
 EXTRA_mtr_SOURCES = curses.c \
                     gtk.c
 mtr_DEPENDENCIES = $(GTK_OBJ) $(CURSES_OBJ)
 mtr_LDFLAGS = $(GTK_OBJ) $(CURSES_OBJ)
 
+CLEANFILES = version.h
+BUILT_SOURCES = version.h
+
+version.h: version.h.tmp Makefile $(mtr_SOURCES)
+	@cat $< > $@; \
+	if [ -d .git ] && [ -n "$$(which git)" ]; then \
+	  xver="+git-$$(git rev-list -n1 --abbrev=8 --abbrev-commit HEAD)"; \
+	  sed \
+	    -e "/#define *MTR_VERSION */{s/\"\([^\"]*\)\"/\"\1$$xver\"/;}" \
+	    $< > $@; \
+	fi;
+
 EXTRA_DIST = SECURITY mtr.8 Makefile Makefile.dist
 distclean-local:
 	(sleep 3; cp Makefile.dist Makefile) &

configure.in

@@ -1,6 +1,7 @@
 AC_INIT(mtr.c)
 AM_INIT_AUTOMAKE(mtr, 0.83)
 
+AC_CONFIG_FILES([version.h.tmp:version.h.in])
 
 AC_SUBST(GTK_OBJ)
 AC_SUBST(CURSES_OBJ)

curses.c

@@ -64,6 +64,7 @@
 #include "net.h"
 #include "dns.h"
 #include "asn.h"
+#include "version.h"
 #include <glib.h>
 #endif
 
@@ -565,7 +566,7 @@ void mtr_curses_redraw(void)
 
   move(0, 0);
   attron(A_BOLD);
-  pwcenter("My traceroute  [v" VERSION "]");
+  pwcenter("My traceroute  [v" MTR_VERSION "]");
   attroff(A_BOLD);
 
   mvprintw(1, 0, "%s (%s)", LocalHostname, net_localaddr());

gtk.c

@@ -36,6 +36,7 @@
 #include "net.h"
 #include "dns.h"
 #include "mtr-gtk.h"
+#include "version.h"
 
 #include "img/mtr_icon.xpm"
 #endif
@@ -167,7 +168,7 @@ gint About_clicked(UNUSED GtkWidget *Button, UNUSED gpointer data)
     };
 
   gtk_show_about_dialog(GTK_WINDOW(main_window)
-    , "version", VERSION
+    , "version", MTR_VERSION
     , "copyright", "Copyright \xc2\xa9 1997,1998  Matt Kimball"
     , "website", "http://www.bitwizard.nl/mtr/"
     , "authors", authors

mtr.c

@@ -35,6 +35,7 @@
 #include "report.h"
 #include "net.h"
 #include "asn.h"
+#include "version.h"
 
 
 #ifdef ENABLE_IPV6
@@ -387,7 +388,7 @@ int main(int argc, char **argv)
   }
 
   if (PrintVersion) {
-    printf ("mtr " VERSION "\n");
+    printf ("mtr " MTR_VERSION "\n");
     exit(0);
   }
 

version.h.in

@@ -0,0 +1,20 @@
+/*
+    mtr  --  a network diagnostic tool
+    Copyright (C) 1997,1998  Matt Kimball
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License version 2 as 
+    published by the Free Software Foundation.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+#define MTR_VERSION "@VERSION@"
+