X-Git-Url: https://git.lttng.org/?p=lttng-tools.git;a=blobdiff_plain;f=src%2Fbin%2Flttng%2Fcommands%2Fhelp.cpp;fp=src%2Fbin%2Flttng%2Fcommands%2Fhelp.cpp;h=a9a01e7f14a65db8084e5b8cdbdaa6c0ad038c8d;hp=0000000000000000000000000000000000000000;hb=48a4000561343808724f7cb5fa8c131877489ccd;hpb=81663f073dbfb4b61c06a0ceb8ca33c4fc41b1c5

diff --git a/src/bin/lttng/commands/help.cpp b/src/bin/lttng/commands/help.cpp
new file mode 100644
index 000000000..a9a01e7f1
--- /dev/null
+++ b/src/bin/lttng/commands/help.cpp
@@ -0,0 +1,120 @@
+/*
+ * Copyright (C) 2015 Philippe Proulx <pproulx@efficios.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0-only
+ *
+ */
+
+#define _LGPL_SOURCE
+#include <popt.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "../command.h"
+#include <common/utils.h>
+
+#ifdef LTTNG_EMBED_HELP
+static const char *help_msg =
+#include <lttng-help.1.h>
+;
+#endif
+
+static const char *lttng_help_msg =
+#ifdef LTTNG_EMBED_HELP
+#include <lttng.1.h>
+#else
+NULL
+#endif
+;
+
+enum {
+	OPT_HELP = 1,
+	OPT_LIST_OPTIONS,
+};
+
+static struct poptOption long_options[] = {
+	/* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
+	{"help",      'h', POPT_ARG_NONE, 0, OPT_HELP, 0, 0},
+	{"list-options", 0, POPT_ARG_NONE, NULL, OPT_LIST_OPTIONS, NULL, NULL},
+	{0, 0, 0, 0, 0, 0, 0}
+};
+
+/*
+ *  cmd_help
+ */
+int cmd_help(int argc, const char **argv, const struct cmd_struct commands[])
+{
+	int opt, ret = CMD_SUCCESS;
+	char *cmd_name;
+	static poptContext pc;
+	const struct cmd_struct *cmd;
+	int found = 0;
+	const char *cmd_argv[2];
+
+	pc = poptGetContext(NULL, argc, argv, long_options, 0);
+	poptReadDefaultConfig(pc, 0);
+
+	while ((opt = poptGetNextOpt(pc)) != -1) {
+		switch (opt) {
+		case OPT_HELP:
+			SHOW_HELP();
+			goto end;
+		case OPT_LIST_OPTIONS:
+			list_cmd_options(stdout, long_options);
+			goto end;
+		default:
+			ret = CMD_UNDEFINED;
+			goto end;
+		}
+	}
+
+	/* Get command name */
+	cmd_name = (char *) poptGetArg(pc);
+
+	if (cmd_name == NULL) {
+		/* Fall back to lttng(1) */
+		ret = utils_show_help(1, "lttng", lttng_help_msg);
+		if (ret) {
+			ERR("Cannot show --help for `lttng`");
+			perror("exec");
+			ret = CMD_ERROR;
+		}
+
+		goto end;
+	}
+
+	/* Help about help? */
+	if (strcmp(cmd_name, "help") == 0) {
+		SHOW_HELP();
+		goto end;
+	}
+
+	/* Make sure command name exists */
+	cmd = &commands[0];
+
+	while (cmd->name != NULL) {
+		if (strcmp(cmd->name, cmd_name) == 0) {
+			found = 1;
+			break;
+		}
+
+		cmd++;
+	}
+
+	if (!found) {
+		ERR("Unknown command \"%s\"", cmd_name);
+		ret = CMD_ERROR;
+		goto end;
+	}
+
+	/* Show command's help */
+	cmd_argv[0] = cmd->name;
+	cmd_argv[1] = "--help";
+	LTTNG_ASSERT(cmd->func);
+	ret = cmd->func(2, cmd_argv);
+
+end:
+	poptFreeContext(pc);
+	return ret;
+}