Add the version command.

examples/Makefile.am

@@ -10,5 +10,6 @@ dctool_SOURCES = \
 	dctool.h \
 	dctool.c \
 	dctool_help.c \
+	dctool_version.c \
 	utils.h \
 	utils.c

examples/dctool.c

@@ -49,6 +49,7 @@
 
 static const dctool_command_t *g_commands[] = {
 	&dctool_help,
+	&dctool_version,
 	NULL
 };
 

examples/dctool.h

@@ -43,6 +43,7 @@ typedef struct dctool_command_t {
 } dctool_command_t;
 
 extern const dctool_command_t dctool_help;
+extern const dctool_command_t dctool_version;
 
 const dctool_command_t *
 dctool_command_find (const char *name);

examples/dctool_version.c

@@ -0,0 +1,94 @@
+/*
+ * libdivecomputer
+ *
+ * Copyright (C) 2015 Jef Driesen
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02110-1301 USA
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <stdlib.h>
+#include <unistd.h>
+#include <stdio.h>
+#ifdef HAVE_GETOPT_H
+#include <getopt.h>
+#endif
+
+#include <libdivecomputer/context.h>
+#include <libdivecomputer/descriptor.h>
+#include <libdivecomputer/version.h>
+
+#include "dctool.h"
+
+static int
+dctool_version_run (int argc, char *argv[], dc_context_t *context, dc_descriptor_t *descriptor)
+{
+	// Default option values.
+	unsigned int help = 0;
+
+	// Parse the command-line options.
+	int opt = 0;
+	const char *optstring = "h";
+#ifdef HAVE_GETOPT_LONG
+	struct option options[] = {
+		{"help",        no_argument,       0, 'h'},
+		{0,             0,                 0,  0 }
+	};
+	while ((opt = getopt_long (argc, argv, optstring, options, NULL)) != -1) {
+#else
+	while ((opt = getopt (argc, argv, optstring)) != -1) {
+#endif
+		switch (opt) {
+		case 'h':
+			help = 1;
+			break;
+		default:
+			return EXIT_FAILURE;
+		}
+	}
+
+	argc -= optind;
+	argv += optind;
+
+	// Show help message.
+	if (help) {
+		dctool_command_showhelp (&dctool_version);
+		return EXIT_SUCCESS;
+	}
+
+	printf ("libdivecomputer version %s\n", dc_version (NULL));
+
+	return EXIT_SUCCESS;
+}
+
+const dctool_command_t dctool_version = {
+	dctool_version_run,
+	DCTOOL_CONFIG_NONE,
+	"version",
+	"Show version information",
+	"Usage:\n"
+	"   dctool version [options]\n"
+	"\n"
+	"Options:\n"
+#ifdef HAVE_GETOPT_LONG
+	"   -h, --help   Show help message\n"
+#else
+	"   -h   Show help message\n"
+#endif
+};