Adding additional command line flags for help and version.

Makefile

@@ -15,11 +15,11 @@ install : $(PROGRAMS)
 	cp $^ $(HOME)/bin/
 
 dlight : dlight.o buffer.o env.o http.o rss.o lockfile.o filter.o cconf.o \
-	proc-cache.o dlhist.o hash.o xalloc.o error.o utils.o
+	proc-cache.o dlhist.o hash.o xalloc.o error.o utils.o version.o
 dlight-compile : compile.o buffer.o env.o lockfile.o filter.o cconf.o \
-	error.o
+	error.o version.o
-dlight-read-config : read-config.o buffer.o env.o cconf.o error.o
+dlight-read-config : read-config.o buffer.o env.o cconf.o error.o version.o
-dlight-filter-check: filter-check.o filter.o error.o
+dlight-filter-check: filter-check.o filter.o error.o version.o
 
 dlight-% : %.o
 	$(CC) $(LDFLAGS) -o $@ $^

compile.c

@@ -31,6 +31,7 @@
 #include "cconf.h"
 #include "lockfile.h"
 #include "filter.h"
+#include "version.h"
 
 #define isalias(x) (isalnum(x) || (x) == '-')
 
@@ -303,6 +304,18 @@ int main(int argc, char **argv) {
 	struct lockfile lock = LOCKFILE_INIT;
 	char filename[4096];
 
+	if (argc > 1) {
+		if (!strcmp(argv[1], "-h") || !strcmp(argv[1], "-help")) {
+			printf("dlight compiler\n");
+			printf("%s [--help|-h|--version|-v]\n", argv[0]);
+		} else if (!strcmp(argv[1], "-v")
+			|| !strcmp(argv[1], "--version")) {
+			printf("Version: %s\n",
+				dlight_version_str);
+		}
+		return 0;
+	}
+
 	snprintf(filename, sizeof(filename), "%s/%s",
 		env_get_dir(), "config");
 

dlight.c

@@ -14,6 +14,7 @@
 #include "filter.h"
 #include "http.h"
 #include "rss.h"
+#include "version.h"
 
 #define PROC_CACHE_PURGE_INTERVAL (60*60*6) /* 6 hours (in seconds) */
 #define DLHIST_PURGE_INTERVAL (60*60*24) /* 1 day */
@@ -103,6 +104,17 @@ int main(int argc, char *argv[]) {
 	struct cconf *config;
 	char configfile[4096];
 
+	if (argc > 1) {
+		if (!strcmp(argv[1], "-h") || !strcmp(argv[1], "-help")) {
+			printf("%s [--help|-h|--version|-v]\n", argv[0]);
+		} else if (!strcmp(argv[1], "-v")
+			|| !strcmp(argv[1], "--version")) {
+			printf("dlight version %s\n",
+				dlight_version_str);
+		}
+		return 0;
+	}
+
 	snprintf(configfile, sizeof(configfile), "%s/%s",
 		env_get_dir(), "config");
 

filter-check.c

@@ -20,13 +20,26 @@
 #include <stdio.h>
 #include "error.h"
 #include "filter.h"
+#include "version.h"
 
-const char *usagestr = "dlight-filter-check <pattern> <subject>";
+const char *usagestr =
+	"dlight-filter-check [ --help | -h | --version | -v ] "
+	"| [ <pattern> <subject> ]";
 
 int main(int argc, char **argv) {
 
-	if (argc < 3)
+	if (argc > 1) {
+		if (!strcmp(argv[1], "-h") || !strcmp(argv[1], "-help")) {
+			usage(usagestr);
+		} else if (!strcmp(argv[1], "-v")
+			|| !strcmp(argv[1], "--version")) {
+			printf("Version: %s\n",
+				dlight_version_str);
+			return 0;
+		}
+	} else if (argc < 3) {
 		usage(usagestr);
+	}
 
 	if (!filter_check_syntax(argv[1]))
 		return 0;
@@ -37,4 +50,4 @@ int main(int argc, char **argv) {
 		puts("nomatch");
 	}
 	return 0;
-}
+}

read-config.c

@@ -23,8 +23,10 @@
 #include "cconf.h"
 #include "env.h"
 #include "error.h"
+#include "version.h"
 
-static char *usagestr = "dlight-read-config [ <file> | -h ]";
+static char *usagestr =
+	"dlight-read-config [ --help | -h | --version | -v ] [ <file> ]";
 
 int main(int argc, char **argv) {
 
@@ -33,8 +35,13 @@ int main(int argc, char **argv) {
 	char file[4096];
 
 	if (argc > 1) {
-		if (!strcmp(argv[1], "-h")) {
+		if (!strcmp(argv[1], "-h") || !strcmp(argv[1], "-help")) {
 			usage(usagestr);
+		} else if (!strcmp(argv[1], "-v")
+			|| !strcmp(argv[1], "--version")) {
+			printf("Version: %s\n",
+				dlight_version_str);
+			return 0;
 		}
 		strncpy(file, argv[1], sizeof(file));
 	} else {