cmd-if-shell.c

   1 /* $OpenBSD$ */
   2
   3 /*
   4  * Copyright (c) 2009 Tiago Cunha <me@tiagocunha.org>
   5  * Copyright (c) 2009 Nicholas Marriott <nicm@openbsd.org>
   6  *
   7  * Permission to use, copy, modify, and distribute this software for any
   8  * purpose with or without fee is hereby granted, provided that the above
   9  * copyright notice and this permission notice appear in all copies.
  10  *
  11  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  12  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  13  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  14  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  15  * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
  16  * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
  17  * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  18  */
  19
  20 #include <sys/types.h>
  21 #include <sys/wait.h>
  22
  23 #include <ctype.h>
  24 #include <stdlib.h>
  25 #include <string.h>
  26
  27 #include "tmux.h"
  28
  29 /*
  30  * Executes a tmux command if a shell command returns true or false.
  31  */
  32
  33 static enum args_parse_type     cmd_if_shell_args_parse(struct args *, u_int,
  34                                     char **);
  35 static enum cmd_retval          cmd_if_shell_exec(struct cmd *,
  36                                     struct cmdq_item *);
  37
  38 static void     cmd_if_shell_callback(struct job *);
  39 static void     cmd_if_shell_free(void *);
  40
  41 const struct cmd_entry cmd_if_shell_entry = {
  42         .name = "if-shell",
  43         .alias = "if",
  44
  45         .args = { "bFt:", 2, 3, cmd_if_shell_args_parse },
  46         .usage = "[-bF] " CMD_TARGET_PANE_USAGE " shell-command command "
  47                  "[command]",
  48
  49         .target = { 't', CMD_FIND_PANE, CMD_FIND_CANFAIL },
  50
  51         .flags = 0,
  52         .exec = cmd_if_shell_exec
  53 };
  54
  55 struct cmd_if_shell_data {
  56         struct args_command_state       *cmd_if;
  57         struct args_command_state       *cmd_else;
  58
  59         struct client                   *client;
  60         struct cmdq_item                *item;
  61 };
  62
  63 static enum args_parse_type
  64 cmd_if_shell_args_parse(__unused struct args *args, u_int idx,
  65     __unused char **cause)
  66 {
  67         if (idx == 1 || idx == 2)
  68                 return (ARGS_PARSE_COMMANDS_OR_STRING);
  69         return (ARGS_PARSE_STRING);
  70 }
  71
  72 static enum cmd_retval
  73 cmd_if_shell_exec(struct cmd *self, struct cmdq_item *item)
  74 {
  75         struct args                     *args = cmd_get_args(self);
  76         struct cmd_find_state           *target = cmdq_get_target(item);
  77         struct cmd_if_shell_data        *cdata;
  78         struct cmdq_item                *new_item;
  79         char                            *shellcmd;
  80         struct client                   *tc = cmdq_get_target_client(item);
  81         struct session                  *s = target->s;
  82         struct cmd_list                 *cmdlist;
  83         u_int                            count = args_count(args);
  84         int                              wait = !args_has(args, 'b');
  85
  86         shellcmd = format_single_from_target(item, args_string(args, 0));
  87         if (args_has(args, 'F')) {
  88                 if (*shellcmd != '0' && *shellcmd != '\0')
  89                         cmdlist = args_make_commands_now(self, item, 1, 0);
  90                 else if (count == 3)
  91                         cmdlist = args_make_commands_now(self, item, 2, 0);
  92                 else {
  93                         free(shellcmd);
  94                         return (CMD_RETURN_NORMAL);
  95                 }
  96                 free(shellcmd);
  97                 if (cmdlist == NULL)
  98                         return (CMD_RETURN_ERROR);
  99                 new_item = cmdq_get_command(cmdlist, cmdq_get_state(item));
 100                 cmdq_insert_after(item, new_item);
 101                 return (CMD_RETURN_NORMAL);
 102         }
 103
 104         cdata = xcalloc(1, sizeof *cdata);
 105
 106         cdata->cmd_if = args_make_commands_prepare(self, item, 1, NULL, wait,
 107             0);
 108         if (count == 3) {
 109                 cdata->cmd_else = args_make_commands_prepare(self, item, 2,
 110                     NULL, wait, 0);
 111         }
 112
 113         if (wait) {
 114                 cdata->client = cmdq_get_client(item);
 115                 cdata->item = item;
 116         } else
 117                 cdata->client = tc;
 118         if (cdata->client != NULL)
 119                 cdata->client->references++;
 120
 121         if (job_run(shellcmd, 0, NULL, NULL, s,
 122             server_client_get_cwd(cmdq_get_client(item), s), NULL,
 123             cmd_if_shell_callback, cmd_if_shell_free, cdata, 0, -1,
 124             -1) == NULL) {
 125                 cmdq_error(item, "failed to run command: %s", shellcmd);
 126                 free(shellcmd);
 127                 free(cdata);
 128                 return (CMD_RETURN_ERROR);
 129         }
 130         free(shellcmd);
 131
 132         if (!wait)
 133                 return (CMD_RETURN_NORMAL);
 134         return (CMD_RETURN_WAIT);
 135 }
 136
 137 static void
 138 cmd_if_shell_callback(struct job *job)
 139 {
 140         struct cmd_if_shell_data        *cdata = job_get_data(job);
 141         struct client                   *c = cdata->client;
 142         struct cmdq_item                *item = cdata->item, *new_item;
 143         struct args_command_state       *state;
 144         struct cmd_list                 *cmdlist;
 145         char                            *error;
 146         int                              status;
 147
 148         status = job_get_status(job);
 149         if (!WIFEXITED(status) || WEXITSTATUS(status) != 0)
 150                 state = cdata->cmd_else;
 151         else
 152                 state = cdata->cmd_if;
 153         if (state == NULL)
 154                 goto out;
 155
 156         cmdlist = args_make_commands(state, 0, NULL, &error);
 157         if (cmdlist == NULL) {
 158                 if (cdata->item == NULL) {
 159                         *error = toupper((u_char)*error);
 160                         status_message_set(c, -1, 1, 0, "%s", error);
 161                 } else
 162                         cmdq_error(cdata->item, "%s", error);
 163                 free(error);
 164         } else if (item == NULL) {
 165                 new_item = cmdq_get_command(cmdlist, NULL);
 166                 cmdq_append(c, new_item);
 167         } else {
 168                 new_item = cmdq_get_command(cmdlist, cmdq_get_state(item));
 169                 cmdq_insert_after(item, new_item);
 170         }
 171
 172 out:
 173         if (cdata->item != NULL)
 174                 cmdq_continue(cdata->item);
 175 }
 176
 177 static void
 178 cmd_if_shell_free(void *data)
 179 {
 180         struct cmd_if_shell_data        *cdata = data;
 181
 182         if (cdata->client != NULL)
 183                 server_client_unref(cdata->client);
 184
 185         if (cdata->cmd_else != NULL)
 186                 args_make_commands_free(cdata->cmd_else);
 187         args_make_commands_free(cdata->cmd_if);
 188
 189         free(cdata);
 190 }