Re-add version option that prints git sha

Author: torbiak

Makefile

@@ -11,8 +11,9 @@ HEADERS := config.h jot.h pk.h
 
 all: ptrkeys
 
+ptrkeys: VERSION := $(shell git rev-parse HEAD)
 ptrkeys: ${HEADERS} ptrkeys.c pk.c
-	${CC} -o $@ ${CPPFLAGS} ${CFLAGS} ${LDFLAGS} ptrkeys.c pk.c
+	${CC} -o $@ ${CPPFLAGS} ${CFLAGS} ${LDFLAGS} -DVERSION=\"${VERSION}\" ptrkeys.c pk.c
 
 config.h:
 	cp config.def.h $@

ptrkeys.1

@@ -3,16 +3,24 @@
 ptrkeys \- mouse keys for X11
 .SH SYNOPSIS
 .B ptrkeys
-.RB [ \-d ]
+.RB [ \-d | \-\-debug ]
+.RB [ \-h | \-\-help ]
+.RB [ \-\-version ]
 .SH DESCRIPTION
 ptrkeys binds the keyboard to pointer movement, scrolling, and mouse button presses on X.
 .P
 See README.md in the source repository for more information.
 .SH OPTIONS
 .TP
-.B \-d
-enable debug output
-.SH KEY BINDINGS
+.B \-d, \-\-debug
+Enable debug output.
+.TP
+.B \-h, \-\-help
+Print help.
+.TP
+.B \-\-version
+Print version.
+.SH DEFAULT KEY BINDINGS
 By default ptrkeys has a handful of "global hotkeys", marked with "(global)" below, that are passively grabbed with X and used to actively grab the keyboard so the rest of the keybindings are active.
 .SS Enable/Disable
 .TP

ptrkeys.c

@@ -7,7 +7,7 @@
 #include "pk.h"
 #include "jot.h"
 
-#define USAGE "usage: ptrkeys [-d|--debug] [-h|--help]\n"
+#define USAGE "usage: ptrkeys [-d|--debug] [-h|--help] [--version]\n"
 
 static void onsigint();
 static void setsighandler();
@@ -45,6 +45,9 @@ parseargs(int argc, char *argv[])
 		} else if (!strcmp(argv[i], "-h") || !strcmp(argv[i], "--help")) {
 			fprintf(stdout, USAGE);
 			exit(0);
+		} else if (!strcmp(argv[i], "--version")) {
+			fprintf(stdout, VERSION "\n");
+			exit(0);
 		} else {
 			fprintf(stderr, USAGE);
 			exit(1);