Add version support

Initial commit at version 1.1.0-rc1. This adds support for the
-V,--version switches to print current program version to stdout.

2 files changed, 35 insertions, 6 deletions

diff --git a/Makefile b/Makefile
index 15186c0..1497243 100644
--- a/Makefile
+++ b/Makefile
@@ -5,10 +5,18 @@ BINDIR=/usr/bin
 INITDIR=/etc/rc.d
 CONFDIR=/etc/
 
+VERSION      = 1
+PATCHLEVEL   = 1
+SUBLEVEL     = 0
+EXTRAVERSION = -rc1
+
+VERSTR = "$(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL))$(EXTRAVERSION)"
+
+
 all:
 	if [ ! -d obj ]; then mkdir obj; fi
 	cc $(CCOPTS) $(DBG) src/config.c -c -o obj/config.o
-	cc $(CCOPTS) $(DBG) obj/*.o src/main.c -o luminous
+	cc $(CCOPTS) $(DBG) -DVERSTR=$(VERSTR) obj/*.o src/main.c -o luminous
 
 install:
 	install -D luminous    ${DESTDIR}/${BINDIR}/luminous
diff --git a/src/main.c b/src/main.c
index f3ab73a..5a790e2 100644
--- a/src/main.c
+++ b/src/main.c
@@ -24,6 +24,10 @@
 
 #define CONF "/etc/luminous.conf"
 
+// For string macros
+#define xstr(s) str(s)
+#define str(s) #s
+
 
 struct props {
   int lvl;
@@ -48,6 +52,19 @@ void props_new(struct props* p) {
 
 
 /**
+ * version_print:
+ * @fd File descriptor to print version information to
+ *
+ * Prints version information for the current build to the specified file
+ * descriptor.
+ * NOTE: Version information is pulled from a macro defined by the Makefile.
+ */
+void version_print(FILE* fd) {
+  fprintf(fd, "luminous %s\n", xstr(VERSTR));
+}
+
+
+/**
  * fgeti:
  * @path
  *
@@ -177,11 +194,12 @@ void usage() {
 "  luminous --rate 10 --step 8 --level [+-]400\n"
 "\n"
 "Arguments:\n"
-"  -h,--help  Print this helptext\n"
-"  -s,--step  Fade step (default: 6)\n"
-"  -r,--rate  Time in milliseconds between fade steps (default: 10)\n"
-"  -l,--level Brightness level to change to. Supports absolute values and\n"
-"             relative values prefixed with + and -."
+"  -h,--help    Print this helptext\n"
+"  -s,--step    Fade step (default: 6)\n"
+"  -r,--rate    Time in milliseconds between fade steps (default: 10)\n"
+"  -l,--level   Brightness level to change to. Supports absolute values and\n"
+"               relative values prefixed with + and -.\n"
+"  -V,--version Print program version"
 "\n\n"
 );
 }
@@ -226,6 +244,9 @@ int parseargs(struct props* out, int argc, char* argv[]) {
       } else {
         out->lvl = atoi(argv[i]);
       }
+    } else if(strcmp(argv[i], "-V") == 0 || strcmp(argv[i], "--version") == 0) {
+      version_print(stdout);
+      return -2;
     } else if(strcmp(argv[i], "-h") == 0 || strcmp(argv[i], "--help") == 0) {
       usage();
       return -2;