1 files changed, 163 insertions, 0 deletions
diff --git a/ctdb/common/cmdline.h b/ctdb/common/cmdline.h
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+++ b/ctdb/common/cmdline.h
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+/*
+   Command line processing
+
+   Copyright (C) Amitay Isaacs  2018
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program 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 General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef __CTDB_CMDLINE_H__
+#define __CTDB_CMDLINE_H__
+
+#include <popt.h>
+#include <talloc.h>
+
+/**
+ * @file cmdline.h
+ *
+ * @brief Command-line handling with options and commands
+ *
+ * This abstraction encapsulates the boiler-plate for parsing options,
+ * commands and arguments on command-line.
+ *
+ * Options handling is done using popt.
+ */
+
+/**
+ * @brief Abstract data structure holding command-line configuration
+ */
+struct cmdline_context;
+
+/**
+ * @brief A command definition structure
+ *
+ * @name is the name of the command
+ * @fn is the implementation of the command
+ * @msg_help is the help message describing command
+ * @msg_args is the help message describing arguments
+ *
+ * A command name can be a single word or multiple words separated with spaces.
+ *
+ * An implementation function should return 0 on success and non-zero value
+ * on failure.  This value is returned as result in @cmdline_run.
+ */
+struct cmdline_command {
+	const char *name;
+	int (*fn)(TALLOC_CTX *mem_ctx,
+		  int argc,
+		  const char **argv,
+		  void *private_data);
+	const char *msg_help;
+	const char *msg_args;
+};
+
+/**
+ * @brief convinience macro to define the end of commands list
+ *
+ * Here is an example of defining commands list.
+ *
+ * struct cmdline_command commands[] = {
+ *	{ "command1", command1_func, "Run command1", NULL },
+ *	{ "command2", command2_func, "Run command2", "<filename>" },
+ *	CMDLINE_TABLEEND
+ * };
+ */
+#define CMDLINE_TABLEEND  { NULL, NULL, NULL, NULL }
+
+/**
+ * @brief Initialize cmdline abstraction
+ *
+ * If there are no options, options can be NULL.
+ *
+ * Help options (--help, -h) are automatically added to the options.
+ *
+ * @param[in] mem_ctx Talloc memory context
+ * @param[in] prog Program name
+ * @param[in] options Command-line options
+ * @param[in] section Name of section grouping specified commands
+ * @param[in] commands Commands array
+ * @param[out] result New cmdline context
+ * @return 0 on success, errno on failure
+ *
+ * Freeing cmdline context will free up all the resources.
+ */
+int cmdline_init(TALLOC_CTX *mem_ctx,
+		 const char *prog,
+		 struct poptOption *options,
+		 const char *section,
+		 struct cmdline_command *commands,
+		 struct cmdline_context **result);
+
+
+/**
+ * @brief Add command line section/commands
+ *
+ * @param[in] cmdline Cmdline context
+ * @param[in] section Name of section grouping specified commands
+ * @param[in] commands Commands array
+ * @return 0 on success, errno on failure
+ */
+int cmdline_add(struct cmdline_context *cmdline,
+		const char *section,
+		struct cmdline_command *commands);
+
+/**
+ * @brief Parse command line options and commands/arguments
+ *
+ * This function parses the arguments to process options and commands.
+ *
+ * This function should be passed the arguments to main() and parse_options
+ * should be set to true.  If cmdline is used for handling second-level
+ * commands, then parse_options should be set to false.
+ *
+ * If argv does not match any command, then ENOENT is returned.
+ *
+ * @param[in] cmdline Cmdline context
+ * @param[in] argc Number of arguments
+ * @param[in] argv Arguments array
+ * @param[in] parse_options Whether to parse for options
+ * @return 0 on success, errno on failure
+ */
+int cmdline_parse(struct cmdline_context *cmdline,
+		  int argc,
+		  const char **argv,
+		  bool parse_options);
+
+/**
+ * @brief Excecute the function for the command matched by @cmdline_parse
+ *
+ * @param[in] cmdline Cmdline context
+ * @param[in] private_data Private data for implementation function
+ * @param[out] result Return value from the implementation function
+ * @return 0 on success, errno on failure
+ *
+ * If help options are specified, then detailed help will be printed and
+ * the return value will be EAGAIN.
+ */
+int cmdline_run(struct cmdline_context *cmdline,
+		void *private_data,
+		int *result);
+
+/**
+ * @brief Print usage help message to stdout
+ *
+ * @param[in] cmdline Cmdline context
+ * @param[in] command Command string
+ *
+ * If command is NULL, then full help is printed.
+ * If command is specified, then compact help is printed.
+ */
+void cmdline_usage(struct cmdline_context *cmdline, const char *command);
+
+#endif /* __CTDB_CMDLINE_H__ */