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 <string.h>
  24
  25 #include "tmux.h"
  26
  27 /*
  28  * Executes a tmux command if a shell command returns true.
  29  */
  30
  31 int     cmd_if_shell_check(struct args *);
  32 int     cmd_if_shell_exec(struct cmd *, struct cmd_ctx *);
  33
  34 void    cmd_if_shell_callback(struct job *);
  35 void    cmd_if_shell_free(void *);
  36
  37 const struct cmd_entry cmd_if_shell_entry = {
  38         "if-shell", "if",
  39         "", 2, 4,
  40         "shell-command command [else command]",
  41         0,
  42         NULL,
  43         cmd_if_shell_check,
  44         cmd_if_shell_exec
  45 };
  46
  47 struct cmd_if_shell_data {
  48         char            *cmd_if;
  49         char            *cmd_else;
  50         struct cmd_ctx   ctx;
  51 };
  52
  53 int
  54 cmd_if_shell_check(struct args *args)
  55 {
  56         if (args->argc == 3)
  57                 return (-1);
  58         if (args->argc == 4 && strcmp(args->argv[2], "else") != 0)
  59                 return (-1);
  60         return (0);
  61 }
  62
  63 int
  64 cmd_if_shell_exec(struct cmd *self, struct cmd_ctx *ctx)
  65 {
  66         struct args                     *args = self->args;
  67         struct cmd_if_shell_data        *cdata;
  68         const char                      *shellcmd = args->argv[0];
  69
  70         cdata = xmalloc(sizeof *cdata);
  71         cdata->cmd_if = xstrdup(args->argv[1]);
  72         if (args->argc == 4)
  73                 cdata->cmd_else = xstrdup(args->argv[3]);
  74         else
  75                 cdata->cmd_else = NULL;
  76         memcpy(&cdata->ctx, ctx, sizeof cdata->ctx);
  77
  78         if (ctx->cmdclient != NULL)
  79                 ctx->cmdclient->references++;
  80         if (ctx->curclient != NULL)
  81                 ctx->curclient->references++;
  82
  83         job_run(shellcmd, cmd_if_shell_callback, cmd_if_shell_free, cdata);
  84
  85         return (1);     /* don't let client exit */
  86 }
  87
  88 void
  89 cmd_if_shell_callback(struct job *job)
  90 {
  91         struct cmd_if_shell_data        *cdata = job->data;
  92         struct cmd_ctx                  *ctx = &cdata->ctx;
  93         struct cmd_list                 *cmdlist;
  94         char                            *cmd;
  95         char                            *cause;
  96
  97         if (!WIFEXITED(job->status) || WEXITSTATUS(job->status) != 0) {
  98                 cmd = cdata->cmd_else;
  99                 if (cmd == NULL)
 100                         return;
 101         } else
 102                 cmd = cdata->cmd_if;
 103         if (cmd_string_parse(cmd, &cmdlist, &cause) != 0) {
 104                 if (cause != NULL) {
 105                         ctx->error(ctx, "%s", cause);
 106                         xfree(cause);
 107                 }
 108                 return;
 109         }
 110
 111         cmd_list_exec(cmdlist, ctx);
 112         cmd_list_free(cmdlist);
 113 }
 114
 115 void
 116 cmd_if_shell_free(void *data)
 117 {
 118         struct cmd_if_shell_data        *cdata = data;
 119         struct cmd_ctx                  *ctx = &cdata->ctx;
 120         struct msg_exit_data             exitdata;
 121
 122         if (ctx->cmdclient != NULL) {
 123                 ctx->cmdclient->references--;
 124                 exitdata.retcode = ctx->cmdclient->retcode;
 125                 ctx->cmdclient->flags |= CLIENT_EXIT;
 126         }
 127         if (ctx->curclient != NULL)
 128                 ctx->curclient->references--;
 129
 130         if (cdata->cmd_else != NULL)
 131                 xfree(cdata->cmd_else);
 132         xfree(cdata->cmd_if);
 133         xfree(cdata);
 134 }