Add --get option.

doc/sigrok-cli.1

@@ -445,6 +445,11 @@ frames, then quit.
 .BR "\-\-continuous"
 Sample continuously until stopped. Not all devices support this.
 .TP
+.BR "\-\-get " <variable>
+Get the value of
+.B <variable>
+from the specified device and print it.
+.TP
 .BR "\-\-set"
 Set one or more variables specified with the \fB\-\-config\fP option, without
 doing any acquisition.

main.c

@@ -71,6 +71,42 @@ int select_channels(struct sr_dev_inst *sdi)
 	return SR_OK;
 }
 
+static void get_option(void)
+{
+	struct sr_dev_inst *sdi;
+	struct sr_channel_group *cg;
+	const struct sr_config_info *ci;
+	GSList *devices;
+	GVariant *gvar;
+	int ret;
+	char *s;
+
+	if (!(devices = device_scan())) {
+		g_critical("No devices found.");
+		return;
+	}
+	sdi = devices->data;
+	g_slist_free(devices);
+
+	if (sr_dev_open(sdi) != SR_OK) {
+		g_critical("Failed to open device.");
+		return;
+	}
+
+	cg = select_channel_group(sdi);
+	if (!(ci = sr_config_info_name_get(opt_get)))
+		g_critical("Unknown option '%s'", opt_get);
+
+	if ((ret = sr_config_get(sdi->driver, sdi, cg, ci->key, &gvar)) != SR_OK)
+		g_critical("Failed to get '%s': %s", opt_get, sr_strerror(ret));
+	s = g_variant_print(gvar, FALSE);
+	printf("%s\n", s);
+	g_free(s);
+
+	g_variant_unref(gvar);
+	sr_dev_close(sdi);
+}
+
 static void set_options(void)
 {
 	struct sr_dev_inst *sdi;
@@ -176,6 +212,8 @@ int main(int argc, char **argv)
 		show_dev_detail();
 	else if (opt_input_file)
 		load_input_file();
+	else if (opt_get)
+		get_option();
 	else if (opt_set)
 		set_options();
 	else if (opt_samples || opt_time || opt_frames || opt_continuous)

options.c

@@ -45,6 +45,7 @@ gchar *opt_time = NULL;
 gchar *opt_samples = NULL;
 gchar *opt_frames = NULL;
 gchar *opt_continuous = NULL;
+gchar *opt_get = NULL;
 gchar *opt_set = NULL;
 
 /* defines a callback function that generates
@@ -85,6 +86,7 @@ CHECK_ONCE(opt_pd_binary)
 CHECK_ONCE(opt_time)
 CHECK_ONCE(opt_samples)
 CHECK_ONCE(opt_frames)
+CHECK_ONCE(opt_get)
 
 #undef CHECK_STR_ONCE
 
@@ -140,6 +142,7 @@ static const GOptionEntry optargs[] = {
 			"Number of frames to acquire", NULL},
 	{"continuous", 0, 0, G_OPTION_ARG_NONE, &opt_continuous,
 			"Sample continuously", NULL},
+	{"get", 0, 0, G_OPTION_ARG_CALLBACK, &check_opt_get, "Get device option only", NULL},
 	{"set", 0, 0, G_OPTION_ARG_NONE, &opt_set, "Set device options only", NULL},
 	{NULL, 0, 0, 0, NULL, NULL, NULL}
 };

sigrok-cli.h

@@ -109,6 +109,7 @@ extern gchar *opt_time;
 extern gchar *opt_samples;
 extern gchar *opt_frames;
 extern gchar *opt_continuous;
+extern gchar *opt_get;
 extern gchar *opt_set;
 int parse_options(int argc, char **argv);
 void show_help(void);