/* $OpenBSD$ */

/*
* Copyright (c) 2009 Tiago Cunha <[email protected]>
* Copyright (c) 2009 Nicholas Marriott <[email protected]>
*
* 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/wait.h>

#include <ctype.h>
#include <stdlib.h>
#include <string.h>

#include "tmux.h"

/*
* Runs a command without a window.
*/

static enum args_parse_type     cmd_run_shell_args_parse(struct args *, u_int,
                                   char **);
static enum cmd_retval          cmd_run_shell_exec(struct cmd *,
                                   struct cmdq_item *);

static void     cmd_run_shell_timer(int, short, void *);
static void     cmd_run_shell_callback(struct job *);
static void     cmd_run_shell_free(void *);
static void     cmd_run_shell_print(struct job *, const char *);

const struct cmd_entry cmd_run_shell_entry = {
       .name = "run-shell",
       .alias = "run",

       .args = { "bd:Ct:c:", 0, 2, cmd_run_shell_args_parse },
       .usage = "[-bC] [-c start-directory] [-d delay] " CMD_TARGET_PANE_USAGE
                " [shell-command]",

       .target = { 't', CMD_FIND_PANE, CMD_FIND_CANFAIL },

       .flags = 0,
       .exec = cmd_run_shell_exec
};

struct cmd_run_shell_data {
       struct client                   *client;
       char                            *cmd;
       struct args_command_state       *state;
       char                            *cwd;
       struct cmdq_item                *item;
       struct session                  *s;
       int                              wp_id;
       struct event                     timer;
       int                              flags;
};

static enum args_parse_type
cmd_run_shell_args_parse(struct args *args, __unused u_int idx,
   __unused char **cause)
{
       if (args_has(args, 'C'))
               return (ARGS_PARSE_COMMANDS_OR_STRING);
       return (ARGS_PARSE_STRING);
}

static void
cmd_run_shell_print(struct job *job, const char *msg)
{
       struct cmd_run_shell_data       *cdata = job_get_data(job);
       struct window_pane              *wp = NULL;
       struct cmd_find_state            fs;
       struct window_mode_entry        *wme;

       if (cdata->wp_id != -1)
               wp = window_pane_find_by_id(cdata->wp_id);
       if (wp == NULL) {
               if (cdata->item != NULL) {
                       cmdq_print(cdata->item, "%s", msg);
                       return;
               }
               if (cdata->item != NULL && cdata->client != NULL)
                       wp = server_client_get_pane(cdata->client);
               if (wp == NULL && cmd_find_from_nothing(&fs, 0) == 0)
                       wp = fs.wp;
               if (wp == NULL)
                       return;
       }

       wme = TAILQ_FIRST(&wp->modes);
       if (wme == NULL || wme->mode != &window_view_mode)
               window_pane_set_mode(wp, NULL, &window_view_mode, NULL, NULL);
       window_copy_add(wp, 1, "%s", msg);
}

static enum cmd_retval
cmd_run_shell_exec(struct cmd *self, struct cmdq_item *item)
{
       struct args                     *args = cmd_get_args(self);
       struct cmd_find_state           *target = cmdq_get_target(item);
       struct cmd_run_shell_data       *cdata;
       struct client                   *c = cmdq_get_client(item);
       struct client                   *tc = cmdq_get_target_client(item);
       struct session                  *s = target->s;
       struct window_pane              *wp = target->wp;
       const char                      *delay, *cmd;
       double                           d;
       struct timeval                   tv;
       char                            *end;
       int                              wait = !args_has(args, 'b');

       if ((delay = args_get(args, 'd')) != NULL) {
               d = strtod(delay, &end);
               if (*end != '\0') {
                       cmdq_error(item, "invalid delay time: %s", delay);
                       return (CMD_RETURN_ERROR);
               }
       } else if (args_count(args) == 0)
               return (CMD_RETURN_NORMAL);

       cdata = xcalloc(1, sizeof *cdata);
       if (!args_has(args, 'C')) {
               cmd = args_string(args, 0);
               if (cmd != NULL)
                       cdata->cmd = format_single_from_target(item, cmd);
       } else {
               cdata->state = args_make_commands_prepare(self, item, 0, NULL,
                   wait, 1);
       }

       if (args_has(args, 't') && wp != NULL)
               cdata->wp_id = wp->id;
       else
               cdata->wp_id = -1;

       if (wait) {
               cdata->client = c;
               cdata->item = item;
       } else {
               cdata->client = tc;
               cdata->flags |= JOB_NOWAIT;
       }
       if (cdata->client != NULL)
               cdata->client->references++;
       if (args_has(args, 'c'))
               cdata->cwd = xstrdup(args_get(args, 'c'));
       else
               cdata->cwd = xstrdup(server_client_get_cwd(c, s));

       cdata->s = s;
       if (s != NULL)
               session_add_ref(s, __func__);

       evtimer_set(&cdata->timer, cmd_run_shell_timer, cdata);
       if (delay != NULL) {
               timerclear(&tv);
               tv.tv_sec = (time_t)d;
               tv.tv_usec = (d - (double)tv.tv_sec) * 1000000U;
               evtimer_add(&cdata->timer, &tv);
       } else
               event_active(&cdata->timer, EV_TIMEOUT, 1);

       if (!wait)
               return (CMD_RETURN_NORMAL);
       return (CMD_RETURN_WAIT);
}

static void
cmd_run_shell_timer(__unused int fd, __unused short events, void* arg)
{
       struct cmd_run_shell_data       *cdata = arg;
       struct client                   *c = cdata->client;
       const char                      *cmd = cdata->cmd;
       struct cmdq_item                *item = cdata->item, *new_item;
       struct cmd_list                 *cmdlist;
       char                            *error;

       if (cdata->state == NULL) {
               if (cmd == NULL) {
                       if (cdata->item != NULL)
                               cmdq_continue(cdata->item);
                       cmd_run_shell_free(cdata);
                       return;
               }
               if (job_run(cmd, 0, NULL, NULL, cdata->s, cdata->cwd, NULL,
                   cmd_run_shell_callback, cmd_run_shell_free, cdata,
                   cdata->flags, -1, -1) == NULL)
                       cmd_run_shell_free(cdata);
               return;
       }

       cmdlist = args_make_commands(cdata->state, 0, NULL, &error);
       if (cmdlist == NULL) {
               if (cdata->item == NULL) {
                       *error = toupper((u_char)*error);
                       status_message_set(c, -1, 1, 0, "%s", error);
               } else
                       cmdq_error(cdata->item, "%s", error);
               free(error);
       } else if (item == NULL) {
               new_item = cmdq_get_command(cmdlist, NULL);
               cmdq_append(c, new_item);
       } else {
               new_item = cmdq_get_command(cmdlist, cmdq_get_state(item));
               cmdq_insert_after(item, new_item);
       }

       if (cdata->item != NULL)
               cmdq_continue(cdata->item);
       cmd_run_shell_free(cdata);
}

static void
cmd_run_shell_callback(struct job *job)
{
       struct cmd_run_shell_data       *cdata = job_get_data(job);
       struct bufferevent              *event = job_get_event(job);
       struct cmdq_item                *item = cdata->item;
       char                            *cmd = cdata->cmd, *msg = NULL, *line;
       size_t                           size;
       int                              retcode, status;

       do {
               line = evbuffer_readln(event->input, NULL, EVBUFFER_EOL_LF);
               if (line != NULL) {
                       cmd_run_shell_print(job, line);
                       free(line);
               }
       } while (line != NULL);

       size = EVBUFFER_LENGTH(event->input);
       if (size != 0) {
               line = xmalloc(size + 1);
               memcpy(line, EVBUFFER_DATA(event->input), size);
               line[size] = '\0';

               cmd_run_shell_print(job, line);

               free(line);
       }

       status = job_get_status(job);
       if (WIFEXITED(status)) {
               if ((retcode = WEXITSTATUS(status)) != 0)
                       xasprintf(&msg, "'%s' returned %d", cmd, retcode);
       } else if (WIFSIGNALED(status)) {
               retcode = WTERMSIG(status);
               xasprintf(&msg, "'%s' terminated by signal %d", cmd, retcode);
               retcode += 128;
       } else
               retcode = 0;
       if (msg != NULL)
               cmd_run_shell_print(job, msg);
       free(msg);

       if (item != NULL) {
               if (cmdq_get_client(item) != NULL &&
                   cmdq_get_client(item)->session == NULL)
                       cmdq_get_client(item)->retval = retcode;
               cmdq_continue(item);
       }
}

static void
cmd_run_shell_free(void *data)
{
       struct cmd_run_shell_data       *cdata = data;

       evtimer_del(&cdata->timer);
       if (cdata->s != NULL)
               session_remove_ref(cdata->s, __func__);
       if (cdata->client != NULL)
               server_client_unref(cdata->client);
       if (cdata->state != NULL)
               args_make_commands_free(cdata->state);
       free(cdata->cwd);
       free(cdata->cmd);
       free(cdata);
}

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