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 <stdlib.h>
  24 #include <string.h>
  25
  26 #include "tmux.h"
  27
  28 /*
  29  * Executes a tmux command if a shell command returns true or false.
  30  */
  31
  32 enum cmd_retval  cmd_if_shell_exec(struct cmd *, struct cmd_q *);
  33
  34 void    cmd_if_shell_callback(struct job *);
  35 void    cmd_if_shell_done(struct cmd_q *);
  36 void    cmd_if_shell_free(void *);
  37
  38 const struct cmd_entry cmd_if_shell_entry = {
  39         "if-shell", "if",
  40         "bt:", 2, 3,
  41         "[-b] " CMD_TARGET_PANE_USAGE " shell-command command [command]",
  42         0,
  43         NULL,
  44         NULL,
  45         cmd_if_shell_exec
  46 };
  47
  48 struct cmd_if_shell_data {
  49         char            *cmd_if;
  50         char            *cmd_else;
  51         struct cmd_q    *cmdq;
  52         int              bflag;
  53         int              started;
  54 };
  55
  56 enum cmd_retval
  57 cmd_if_shell_exec(struct cmd *self, struct cmd_q *cmdq)
  58 {
  59         struct args                     *args = self->args;
  60         struct cmd_if_shell_data        *cdata;
  61         char                            *shellcmd;
  62         struct session                  *s;
  63         struct winlink                  *wl;
  64         struct window_pane              *wp;
  65         struct format_tree              *ft;
  66
  67         wl = cmd_find_pane(cmdq, args_get(args, 't'), &s, &wp);
  68         if (wl == NULL)
  69                 return (CMD_RETURN_ERROR);
  70
  71         ft = format_create();
  72         format_session(ft, s);
  73         format_winlink(ft, s, wl);
  74         format_window_pane(ft, wp);
  75         shellcmd = format_expand(ft, args->argv[0]);
  76         format_free(ft);
  77
  78         cdata = xmalloc(sizeof *cdata);
  79         cdata->cmd_if = xstrdup(args->argv[1]);
  80         if (args->argc == 3)
  81                 cdata->cmd_else = xstrdup(args->argv[2]);
  82         else
  83                 cdata->cmd_else = NULL;
  84         cdata->bflag = args_has(args, 'b');
  85
  86         cdata->started = 0;
  87         cdata->cmdq = cmdq;
  88         cmdq->references++;
  89
  90         job_run(shellcmd, cmd_if_shell_callback, cmd_if_shell_free, cdata);
  91         free(shellcmd);
  92
  93         if (cdata->bflag)
  94                 return (CMD_RETURN_NORMAL);
  95         return (CMD_RETURN_WAIT);
  96 }
  97
  98 void
  99 cmd_if_shell_callback(struct job *job)
 100 {
 101         struct cmd_if_shell_data        *cdata = job->data;
 102         struct cmd_q                    *cmdq = cdata->cmdq, *cmdq1;
 103         struct cmd_list                 *cmdlist;
 104         char                            *cause, *cmd;
 105
 106         if (cmdq->dead)
 107                 return;
 108
 109         if (!WIFEXITED(job->status) || WEXITSTATUS(job->status) != 0)
 110                 cmd = cdata->cmd_else;
 111         else
 112                 cmd = cdata->cmd_if;
 113         if (cmd == NULL)
 114                 return;
 115
 116         if (cmd_string_parse(cmd, &cmdlist, NULL, 0, &cause) != 0) {
 117                 if (cause != NULL) {
 118                         cmdq_error(cmdq, "%s", cause);
 119                         free(cause);
 120                 }
 121                 return;
 122         }
 123
 124         cdata->started = 1;
 125
 126         cmdq1 = cmdq_new(cmdq->client);
 127         cmdq1->emptyfn = cmd_if_shell_done;
 128         cmdq1->data = cdata;
 129
 130         cmdq_run(cmdq1, cmdlist);
 131         cmd_list_free(cmdlist);
 132 }
 133
 134 void
 135 cmd_if_shell_done(struct cmd_q *cmdq1)
 136 {
 137         struct cmd_if_shell_data        *cdata = cmdq1->data;
 138         struct cmd_q                    *cmdq = cdata->cmdq;
 139
 140         if (!cmdq_free(cmdq) && !cdata->bflag)
 141                 cmdq_continue(cmdq);
 142
 143         cmdq_free(cmdq1);
 144
 145         free(cdata->cmd_else);
 146         free(cdata->cmd_if);
 147         free(cdata);
 148 }
 149
 150 void
 151 cmd_if_shell_free(void *data)
 152 {
 153         struct cmd_if_shell_data        *cdata = data;
 154         struct cmd_q                    *cmdq = cdata->cmdq;
 155
 156         if (cdata->started)
 157                 return;
 158
 159         if (!cmdq_free(cmdq) && !cdata->bflag)
 160                 cmdq_continue(cmdq);
 161
 162         free(cdata->cmd_else);
 163         free(cdata->cmd_if);
 164         free(cdata);
 165 }