From: Simon Ruderich <simon@ruderich.org>
Date: Sun, 18 May 2014 15:20:23 +0000 (+0200)
Subject: add option -v to display current version
X-Git-Url: https://ruderich.org/simon/gitweb/?p=wall-notify%2Fwall-notify.git;a=commitdiff_plain;h=69c5d0cd4e891afaf104d286f7266559afa5a08e

add option -v to display current version

This includes the current Git commit id if a git checkout is used.
---

diff --git a/.gitignore b/.gitignore
index caf945d..2dc54ac 100644
--- a/.gitignore
+++ b/.gitignore
@@ -15,6 +15,7 @@
 /src/.deps/
 /src/Makefile
 /src/Makefile.in
+/src/git_version
 /src/wall-notify
 /src/wall-notify.o
 /stamp-h1
diff --git a/man/wall-notify.txt b/man/wall-notify.txt
index e059204..4a53825 100644
--- a/man/wall-notify.txt
+++ b/man/wall-notify.txt
@@ -10,7 +10,7 @@ wall-notify - receive wall messages and pass them to a notification program
 SYNOPSIS
 --------
 
-*wall-notify* ['-X'] ['-m'] 'cmd' ['args']..
+*wall-notify* ['-X'] ['-m'] ['-v'] 'cmd' ['args']..
 
 
 DESCRIPTION
@@ -35,6 +35,9 @@ OPTIONS
     only messages from root are allowed. Be careful when using this option, it
     might be abused by local users to send fake messages.
 
+*-v*::
+    Display version.
+
 
 AUTHORS
 -------
diff --git a/src/Makefile.am b/src/Makefile.am
index 5b18bbe..e6a1295 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -1 +1,10 @@
 bin_PROGRAMS = wall-notify
+
+# Provide current Git commit id as macro.
+AM_CPPFLAGS = -DGIT_VERSION="\"`cat $(srcdir)/git_version`\""
+wall-notify.$(OBJEXT): $(srcdir)/git_version
+
+$(srcdir)/git_version: $(SOURCES)
+	test -d $(top_srcdir)/.git && git describe --always >$@ || :>$@
+clean-local:
+	rm -f $(srcdir)/git_version
diff --git a/src/wall-notify.c b/src/wall-notify.c
index bd1e8ad..9056af3 100644
--- a/src/wall-notify.c
+++ b/src/wall-notify.c
@@ -361,11 +361,12 @@ static void *x11_event_loop_thread(void *unused) {
 #endif
 
 static void usage(const char *argv0) {
-    fprintf(stderr, "usage: %s [-X] [-m] <cmd args..>\n", argv0);
+    fprintf(stderr, "usage: %s [-X] [-m] [-v] <cmd args..>\n", argv0);
     fprintf(stderr, "Pass wall messages to <cmd args..>.\n");
     fprintf(stderr, "\n");
     fprintf(stderr, "-X quit when the current X session terminates\n");
     fprintf(stderr, "-m allow messages from normal users (like `mesg y`)\n");
+    fprintf(stderr, "-v display version\n");
 #ifdef DONT_USE_X11
     fprintf(stderr, "\n");
     fprintf(stderr, "compiled without X11 support, -X disabled\n");
@@ -392,7 +393,7 @@ int main(int argc, char **argv) {
      * the optstring with "+" fixes this behaver. This is not POSIX
      * compatible, but the option should be ignored on other systems.
      */
-    while ((option = getopt(argc, argv, "+Xmh")) != -1) {
+    while ((option = getopt(argc, argv, "+Xmhv")) != -1) {
         switch (option) {
             case 'X':
                 enable_x11 = 1;
@@ -403,6 +404,12 @@ int main(int argc, char **argv) {
             case 'h':
                 usage(argv[0]);
                 break;
+            case 'v':
+                printf("%s%s\n",
+                       PACKAGE_STRING,
+                       strlen(GIT_VERSION) ? " (Git " GIT_VERSION ")" : "");
+                exit(0);
+                break;
             default:
                 fprintf(stderr, "%s: unknown option '%s'!\n\n",
                                 argv[0], argv[optind - 1]);