tmux/cmd-set-environment.c
Nicholas Marriott 3964309c67 Add a command queue to standardize and simplify commands that call other
commands and allow a command to block execution of subsequent commands. This
allows run-shell and if-shell to be synchronous which has been much requested.

Each client has a default command queue and commands are consumed one at a time
from it. A command may suspend execution from the queue by returning
CMD_RETURN_WAIT and then resume it by calling cmd_continue() - for example
run-shell does this from the callback that is fired after the job is freed.

When the command queue becomes empty, command clients are automatically exited
(unless attaching). A callback is also fired - this is used for nested commands
in, for example, if-shell which can block execution of the client's cmdq until
a new cmdq becomes empty.

Also merge all the old error/info/print functions together and lose the old
curclient/cmdclient distinction - a cmdq is bound to one client (or none if in
the configuration file), this is a command client if c->session is NULL
otherwise an attached client.
2013-02-23 22:25:58 +00:00

95 lines
2.4 KiB
C

/* $Id$ */
/*
* Copyright (c) 2009 Nicholas Marriott <nicm@users.sourceforge.net>
*
* 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.
*/
enum cmd_retval cmd_set_environment_exec(struct cmd *, struct cmd_q *);
const struct cmd_entry cmd_set_environment_entry = {
"set-environment", "setenv",
"grt:u", 1, 2,
"[-gru] " CMD_TARGET_SESSION_USAGE " name [value]",
0,
NULL,
NULL,
cmd_set_environment_exec
};
enum cmd_retval
cmd_set_environment_exec(struct cmd *self, struct cmd_q *cmdq)
{
struct args *args = self->args;
struct session *s;
struct environ *env;
const char *name, *value;
name = args->argv[0];
if (*name == '\0') {
cmdq_error(cmdq, "empty variable name");
return (CMD_RETURN_ERROR);
}
if (strchr(name, '=') != NULL) {
cmdq_error(cmdq, "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 ((s = cmd_find_session(cmdq, args_get(args, 't'), 0)) == NULL)
return (CMD_RETURN_ERROR);
env = &s->environ;
}
if (args_has(self->args, 'u')) {
if (value != NULL) {
cmdq_error(cmdq, "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(cmdq, "can't specify a value with -r");
return (CMD_RETURN_ERROR);
}
environ_set(env, name, NULL);
} else {
if (value == NULL) {
cmdq_error(cmdq, "no value specified");
return (CMD_RETURN_ERROR);
}
environ_set(env, name, value);
}
return (CMD_RETURN_NORMAL);
}