text: /* $OpenBSD$ */
  
  /*
   * Copyright (c) 2009 Nicholas Marriott <nicholas.marriott@gmail.com>
   *
   * 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 <stdlib.h>
  #include <string.h>
  
  #include "tmux.h"
  
  /*
   * Set an environment variable.
   */
  
  static enum cmd_retval	cmd_set_environment_exec(struct cmd *,
  			    struct cmdq_item *);
  
  const struct cmd_entry cmd_set_environment_entry = {
  	.name = "set-environment",
  	.alias = "setenv",
  
  	.args = { "grt:u", 1, 2 },
  	.usage = "[-gru] " CMD_TARGET_SESSION_USAGE " name [value]",
  
  	.target = { 't', CMD_FIND_SESSION, CMD_FIND_CANFAIL },
  
  	.flags = CMD_AFTERHOOK,
  	.exec = cmd_set_environment_exec
  };
  
  static enum cmd_retval
  cmd_set_environment_exec(struct cmd *self, struct cmdq_item *item)
  {
  	struct args	*args = self->args;
  	struct environ	*env;
  	const char	*name, *value, *target;
  
  	name = args->argv[0];
  	if (*name == '\0') {
  		cmdq_error(item, "empty variable name");
  		return (CMD_RETURN_ERROR);
  	}
  	if (strchr(name, '=') != NULL) {
  		cmdq_error(item, "variable name contains =");
  		return (CMD_RETURN_ERROR);
  	}
  
  	if (args->argc < 2)
  		value = NULL;
  	else
  		value = args->argv[1];
  
  	if (args_has(self->args, 'g'))
  		env = global_environ;
  	else {
  		if (item->target.s == NULL) {
  			target = args_get(args, 't');
  			if (target != NULL)
  				cmdq_error(item, "no such session: %s", target);
  			else
  				cmdq_error(item, "no current session");
  			return (CMD_RETURN_ERROR);
  		}
  		env = item->target.s->environ;
  	}
  
  	if (args_has(self->args, 'u')) {
  		if (value != NULL) {
  			cmdq_error(item, "can't specify a value with -u");
  			return (CMD_RETURN_ERROR);
  		}
  		environ_unset(env, name);
  	} else if (args_has(self->args, 'r')) {
  		if (value != NULL) {
  			cmdq_error(item, "can't specify a value with -r");
  			return (CMD_RETURN_ERROR);
  		}
  		environ_clear(env, name);
  	} else {
  		if (value == NULL) {
  			cmdq_error(item, "no value specified");
  			return (CMD_RETURN_ERROR);
  		}
  		environ_set(env, name, "%s", value);
  	}
  
  	return (CMD_RETURN_NORMAL);
  }
  