add version function, wire it up from the makefile

Makefile

@@ -1,6 +1,13 @@
+V=1
+VDEVEL=$(shell test -d .git && git describe 2>/dev/null)
+
+ifneq "$(VDEVEL)" ""
+V=$(VDEVEL)
+endif
+
 CXX := $(CXX) -std=c++11
 
-base_CXXFLAGS = -Wall -Wextra -pedantic -O2 -g
+base_CXXFLAGS = -Wall -Wextra -pedantic -O2 -g -DPONYMIX_VERSION=\"$(V)\"
 base_LIBS = -lm
 
 libpulse_CXXFLAGS = $(shell pkg-config --cflags libpulse)
@@ -35,6 +42,5 @@ install: ponymix
 clean:
 	$(RM) ponymix pulse.o
 
-V=$(shell if test -d .git; then git describe; fi)
 dist:
 	git archive --format=tar --prefix=ponymix-$(V)/ HEAD | gzip -9 > ponymix-$(V).tar.gz

bash-completion

@@ -10,7 +10,7 @@ in_array() {
 _ponymix() {
   local flags='-h --help -c --card -d --device -t --devtype
                -N --notify --source --input --sink --output
-               --sink-input --source-output'
+               --sink-input --source-output -V --version'
   local types='sink sink-input source source-output'
   local verbs=(help defaults set-default list list-short
                list-cards list-cards-short get-volume set-volume

ponymix.cc

@@ -473,10 +473,16 @@ static const std::pair<const string, const Command>& string_to_command(
   return *match;
 }
 
+static void version() {
+  fputs("ponymix v" PONYMIX_VERSION "\n", stdout);
+  exit(EXIT_SUCCESS);
+}
+
 static void usage() {
   printf("usage: %s [options] <command>...\n", program_invocation_short_name);
   fputs("\nOptions:\n"
-        " -h, --help              display this help and exit\n\n"
+        " -h, --help              display this help and exit\n"
+        " -V, --version           display program version and exit\n\n"
 
         " -c, --card CARD         target card (index or name)\n"
         " -d, --device DEVICE     target device (index or name)\n"
@@ -559,6 +565,7 @@ bool parse_options(int argc, char** argv) {
     { "help",           no_argument,       0, 'h' },
     { "notify",         no_argument,       0, 'N' },
     { "type",           required_argument, 0, 't' },
+    { "version",        no_argument,       0, 'V' },
     { "sink",           no_argument,       0, 0x100 },
     { "output",         no_argument,       0, 0x101 },
     { "source",         no_argument,       0, 0x102 },
@@ -569,7 +576,7 @@ bool parse_options(int argc, char** argv) {
   };
 
   for (;;) {
-    int opt = getopt_long(argc, argv, "c:d:hNt:", opts, nullptr);
+    int opt = getopt_long(argc, argv, "c:d:hNt:V", opts, nullptr);
     if (opt == -1)
       break;
 
@@ -590,6 +597,9 @@ bool parse_options(int argc, char** argv) {
       opt_devtype = string_to_devtype_or_die(optarg);
       opt_listrestrict = true;
       break;
+    case 'V':
+      version();
+      break;
     case 0x100:
     case 0x101:
       opt_devtype = DEVTYPE_SINK;

zsh-completion

@@ -107,6 +107,8 @@ else
         '(-c --card -d --device)'{-d,--device}'[Select Device]:devices:_devices' \
         - '(help)' \
             {-h,--help}'[display this help and exit]' \
+        - '(version)' \
+            {-V,--version}'[display program version and exit]' \
         - '(sink)' \
             '--sink[alias to type sink]' \
             '--output[alias to type sink]' \