utility: show version (git commit): initial implementation.

1 files changed, 18 insertions, 0 deletions

diff --git a/src/perk.c b/src/perk.c
index 72cfa37..b8a4ac4 100644
--- a/src/perk.c
+++ b/src/perk.c
@@ -2,11 +2,26 @@
 #include <unistd.h>
 #include <perk/perk.h>
 #include <perk/perk_output.h>
+#include "perk_version.h"
 
 #ifndef PERK_DRIVER_FLAGS
 #define PERK_DRIVER_FLAGS	PERK_DRIVER_VERBOSITY_ERRORS|PERK_DRIVER_VERBOSITY_USAGE
 #endif
 
+static const char vermsg[] = "%s (git://midipix.org/perk): commit %s.\n";
+
+static void perk_version(struct pe_driver_ctx * dctx)
+{
+	char	buf[512];
+	size_t	len;
+
+	if (dctx->cctx.fdout >= 0) {
+		len = sprintf(buf,vermsg,dctx->program,PERK_GIT_VERSION);
+		write(dctx->cctx.fdout,buf,len);
+	} else
+		fprintf(stdout,vermsg,dctx->program,PERK_GIT_VERSION);
+}
+
 static void perk_paragraph_break(struct pe_unit_ctx * uctx, int * fpara)
 {
 	if (*fpara) {
@@ -51,6 +66,9 @@ static int perk_main(int argc, const char ** argv, const char ** envp)
 	if ((ret = pe_get_driver_ctx(argv,envp,PERK_DRIVER_FLAGS,&dctx)))
 		return (ret == PERK_USAGE) ? 0 : 2;
 
+	if (dctx->cctx.drvflags & PERK_DRIVER_VERSION)
+		perk_version(dctx);
+
 	for (unit=dctx->units; *unit; unit++) {
 		if (!(pe_get_unit_ctx(dctx,*unit,&uctx))) {
 			perk_perform_unit_actions(uctx);