/****************************************************************************
 * bfs                                                                      *
 * Copyright (C) 2017 Tavian Barnes <tavianator@tavianator.com>             *
 *                                                                          *
 * Permission to use, copy, modify, and/or distribute this software for any *
 * purpose with or without fee is hereby granted.                           *
 *                                                                          *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES *
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF         *
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR  *
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES   *
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN    *
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF  *
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.           *
 ****************************************************************************/

/**
 * Implementation of -exec/-execdir/-ok/-okdir.
 */

#ifndef BFS_EXEC_H
#define BFS_EXEC_H

#include "bftw.h"
#include "color.h"

struct cmdline;

/**
 * Flags for the -exec actions.
 */
enum bfs_exec_flags {
	/** Prompt the user before executing (-ok, -okdir). */
	BFS_EXEC_CONFIRM = 1 << 0,
	/** Run the command in the file's parent directory (-execdir, -okdir). */
	BFS_EXEC_CHDIR   = 1 << 1,
	/** Pass multiple files at once to the command (-exec ... {} +). */
	BFS_EXEC_MULTI   = 1 << 2,
	/** Print debugging information (-D exec). */
	BFS_EXEC_DEBUG   = 1 << 3,
};

/**
 * Buffer for a command line to be executed.
 */
struct bfs_exec {
	/** Flags for this exec buffer. */
	enum bfs_exec_flags flags;

	/** Command line template. */
	char **tmpl_argv;
	/** Command line template size. */
	size_t tmpl_argc;

	/** The built command line. */
	char **argv;
	/** Number of command line arguments. */
	size_t argc;
	/** Capacity of argv. */
	size_t argv_cap;

	/** Current size of all arguments. */
	size_t arg_size;
	/** Maximum arg_size before E2BIG. */
	size_t arg_max;

	/** A file descriptor for the working directory, for BFS_EXEC_CHDIR. */
	int wd_fd;
	/** The path to the working directory, for BFS_EXEC_CHDIR. */
	char *wd_path;
	/** Length of the working directory path. */
	size_t wd_len;

	/** The ultimate return value for bfs_exec_finish(). */
	int ret;
};

/**
 * Parse an exec action.
 *
 * @param argv
 *         The (bfs) command line argument to parse.
 * @param flags
 *         Any flags for this exec action.
 * @param cmdline
 *         The command line.
 * @return The parsed exec action, or NULL on failure.
 */
struct bfs_exec *parse_bfs_exec(char **argv, enum bfs_exec_flags flags, const struct cmdline *cmdline);

/**
 * Execute the command for a file.
 *
 * @param execbuf
 *         The parsed exec action.
 * @param ftwbuf
 *         The bftw() data for the current file.
 * @return 0 if the command succeeded, -1 if it failed.  If the command could
 *         be executed, -1 is returned, and errno will be non-zero.  For
 *         BFS_EXEC_MULTI, errors will not be reported until bfs_exec_finish().
 */
int bfs_exec(struct bfs_exec *execbuf, const struct BFTW *ftwbuf);

/**
 * Finish executing any commands.
 *
 * @param execbuf
 *         The parsed exec action.
 * @return 0 on success, -1 if any errors were encountered.
 */
int bfs_exec_finish(struct bfs_exec *execbuf);

/**
 * Free a parsed exec action.
 */
void free_bfs_exec(struct bfs_exec *execbuf);

#endif // BFS_EXEC_H