/* $OpenBSD: cmd-save-buffer.c,v 1.57 2025/10/28 07:32:26 nicm Exp $ */

/*
 * Copyright (c) 2009 Tiago Cunha <me@tiagocunha.org>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * 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 MIND, 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.
 */

#include <sys/types.h>
#include <sys/stat.h>

#include <errno.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <vis.h>

#include "tmux.h"

/*
 * Saves a paste buffer to a file.
 */

static enum cmd_retval  cmd_save_buffer_exec(struct cmd *, struct cmdq_item *);

const struct cmd_entry cmd_save_buffer_entry = {
        .name = "save-buffer",
        .alias = "saveb",

        .args = { "ab:", 1, 1, NULL },
        .usage = "[-a] " CMD_BUFFER_USAGE " path",

        .flags = CMD_AFTERHOOK,
        .exec = cmd_save_buffer_exec
};

const struct cmd_entry cmd_show_buffer_entry = {
        .name = "show-buffer",
        .alias = "showb",

        .args = { "b:", 0, 0, NULL },
        .usage = CMD_BUFFER_USAGE,

        .flags = CMD_AFTERHOOK,
        .exec = cmd_save_buffer_exec
};

static void
cmd_save_buffer_done(__unused struct client *c, const char *path, int error,
    __unused int closed, __unused struct evbuffer *buffer, void *data)
{
        struct cmdq_item        *item = data;

        if (!closed)
                return;

        if (error != 0)
                cmdq_error(item, "%s: %s", strerror(error), path);
        cmdq_continue(item);
}

static enum cmd_retval
cmd_save_buffer_exec(struct cmd *self, struct cmdq_item *item)
{
        struct args             *args = cmd_get_args(self);
        struct client           *c = cmdq_get_client(item);
        struct paste_buffer     *pb;
        int                      flags;
        const char              *bufname = args_get(args, 'b'), *bufdata;
        size_t                   bufsize;
        char                    *path;
        struct evbuffer         *evb;

        if (bufname == NULL) {
                if ((pb = paste_get_top(NULL)) == NULL) {
                        cmdq_error(item, "no buffers");
                        return (CMD_RETURN_ERROR);
                }
        } else {
                pb = paste_get_name(bufname);
                if (pb == NULL) {
                        cmdq_error(item, "no buffer %s", bufname);
                        return (CMD_RETURN_ERROR);
                }
        }
        bufdata = paste_buffer_data(pb, &bufsize);

        if (cmd_get_entry(self) == &cmd_show_buffer_entry) {
                if (c->session != NULL || (c->flags & CLIENT_CONTROL)) {
                        evb = evbuffer_new();
                        if (evb == NULL)
                                fatalx("out of memory");
                        evbuffer_add(evb, bufdata, bufsize);
                        cmdq_print_data(item, evb);
                        evbuffer_free(evb);
                        return (CMD_RETURN_NORMAL);
                }
                path = xstrdup("-");
        } else
                path = format_single_from_target(item, args_string(args, 0));
        if (args_has(args, 'a'))
                flags = O_APPEND;
        else
                flags = O_TRUNC;
        file_write(cmdq_get_client(item), path, flags, bufdata, bufsize,
            cmd_save_buffer_done, item);
        free(path);

        return (CMD_RETURN_WAIT);
}