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Add a command queue to standardize and simplify commands that call other

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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.
This commit is contained in:
Nicholas Marriott
2013-03-24 09:54:10 +00:00
parent 66edb3392b
commit 20636d956d
84 changed files with 1240 additions and 1187 deletions
Download Patch File Download Diff File Expand all files Collapse all files

77
cmd-if-shell.c
View File

@ -29,15 +29,16 @@
* Executes a tmux command if a shell command returns true or false.
*/
enum cmd_retval cmd_if_shell_exec(struct cmd *, struct cmd_ctx *);
enum cmd_retval cmd_if_shell_exec(struct cmd *, struct cmd_q *);
void cmd_if_shell_callback(struct job *);
void cmd_if_shell_done(struct cmd_q *);
void cmd_if_shell_free(void *);
const struct cmd_entry cmd_if_shell_entry = {
"if-shell", "if",
"t:", 2, 3,
CMD_TARGET_PANE_USAGE " shell-command command [command]",
"bt:", 2, 3,
"[-b] " CMD_TARGET_PANE_USAGE " shell-command command [command]",
0,
NULL,
NULL,
@ -47,11 +48,13 @@ const struct cmd_entry cmd_if_shell_entry = {
struct cmd_if_shell_data {
char *cmd_if;
char *cmd_else;
struct cmd_ctx *ctx;
struct cmd_q *cmdq;
int bflag;
int started;
};
enum cmd_retval
cmd_if_shell_exec(struct cmd *self, struct cmd_ctx *ctx)
cmd_if_shell_exec(struct cmd *self, struct cmd_q *cmdq)
{
struct args *args = self->args;
struct cmd_if_shell_data *cdata;
@ -61,7 +64,7 @@ cmd_if_shell_exec(struct cmd *self, struct cmd_ctx *ctx)
struct window_pane *wp;
struct format_tree *ft;
wl = cmd_find_pane(ctx, args_get(args, 't'), &s, &wp);
wl = cmd_find_pane(cmdq, args_get(args, 't'), &s, &wp);
if (wl == NULL)
return (CMD_RETURN_ERROR);
@ -78,51 +81,83 @@ cmd_if_shell_exec(struct cmd *self, struct cmd_ctx *ctx)
cdata->cmd_else = xstrdup(args->argv[2]);
else
cdata->cmd_else = NULL;
cdata->bflag = args_has(args, 'b');
cdata->ctx = ctx;
cmd_ref_ctx(ctx);
cdata->started = 0;
cdata->cmdq = cmdq;
cmdq->references++;
job_run(shellcmd, cmd_if_shell_callback, cmd_if_shell_free, cdata);
free(shellcmd);
return (CMD_RETURN_YIELD); /* don't let client exit */
if (cdata->bflag)
return (CMD_RETURN_NORMAL);
return (CMD_RETURN_WAIT);
}
void
cmd_if_shell_callback(struct job *job)
{
struct cmd_if_shell_data *cdata = job->data;
struct cmd_ctx *ctx = cdata->ctx;
struct cmd_q *cmdq = cdata->cmdq, *cmdq1;
struct cmd_list *cmdlist;
char *cause, *cmd;
if (!WIFEXITED(job->status) || WEXITSTATUS(job->status) != 0) {
if (cmdq->dead)
return;
if (!WIFEXITED(job->status) || WEXITSTATUS(job->status) != 0)
cmd = cdata->cmd_else;
if (cmd == NULL)
return;
} else
else
cmd = cdata->cmd_if;
if (cmd_string_parse(cmd, &cmdlist, &cause) != 0) {
if (cmd == NULL)
return;
if (cmd_string_parse(cmd, &cmdlist, NULL, 0, &cause) != 0) {
if (cause != NULL) {
ctx->error(ctx, "%s", cause);
cmdq_error(cmdq, "%s", cause);
free(cause);
}
return;
}
cmd_list_exec(cmdlist, ctx);
cdata->started = 1;
cmdq1 = cmdq_new(cmdq->client);
cmdq1->emptyfn = cmd_if_shell_done;
cmdq1->data = cdata;
cmdq_run(cmdq1, cmdlist);
cmd_list_free(cmdlist);
}
void
cmd_if_shell_done(struct cmd_q *cmdq1)
{
struct cmd_if_shell_data *cdata = cmdq1->data;
struct cmd_q *cmdq = cdata->cmdq;
if (!cmdq_free(cmdq) && !cdata->bflag)
cmdq_continue(cmdq);
cmdq_free(cmdq1);
free(cdata->cmd_else);
free(cdata->cmd_if);
free(cdata);
}
void
cmd_if_shell_free(void *data)
{
struct cmd_if_shell_data *cdata = data;
struct cmd_ctx *ctx = cdata->ctx;
struct cmd_q *cmdq = cdata->cmdq;
if (ctx->cmdclient != NULL)
ctx->cmdclient->flags |= CLIENT_EXIT;
cmd_free_ctx(ctx);
if (cdata->started)
return;
if (!cmdq_free(cmdq) && !cdata->bflag)
cmdq_continue(cmdq);
free(cdata->cmd_else);
free(cdata->cmd_if);