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cli: try to run external notmuch- prefixed commands as subcommands

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If the given subcommand is not known to notmuch, try to execute
external notmuch-<subcommand> instead. This allows users to have their
own notmuch related tools be run via the notmuch command, not unlike
git does. Also notmuch-emacs-mua will be executable via 'notmuch
emacs-mua'.

By design, this does not allow notmuch's own subcommands to be
overriden using external commands.
This commit is contained in:
Jani Nikula 2016-10-22 15:50:05 +03:00 committed by David Bremner
parent b810e64242
commit 429c30c2bc
1 changed files with 37 additions and 2 deletions
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39
notmuch.c
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@ -363,6 +363,39 @@ notmuch_command (notmuch_config_t *config,
return EXIT_SUCCESS;
}
/*
* Try to run subcommand in argv[0] as notmuch- prefixed external
* command. argv must be NULL terminated (argv passed to main always
* is).
*
* Does not return if the external command is found and
* executed. Return TRUE if external command is not found. Return
* FALSE on errors.
*/
static notmuch_bool_t try_external_command(char *argv[])
{
char *old_argv0 = argv[0];
notmuch_bool_t ret = TRUE;
argv[0] = talloc_asprintf (NULL, "notmuch-%s", old_argv0);
/*
* This will only return on errors. Not finding an external
* command (ENOENT) is not an error from our perspective.
*/
execvp (argv[0], argv);
if (errno != ENOENT) {
fprintf (stderr, "Error: Running external command '%s' failed: %s\n",
argv[0], strerror(errno));
ret = FALSE;
}
talloc_free (argv[0]);
argv[0] = old_argv0;
return ret;
}
int
main (int argc, char *argv[])
{
@ -406,8 +439,10 @@ main (int argc, char *argv[])
command = find_command (command_name);
if (!command) {
fprintf (stderr, "Error: Unknown command '%s' (see \"notmuch help\")\n",
command_name);
/* This won't return if the external command is found. */
if (try_external_command(argv + opt_index))
fprintf (stderr, "Error: Unknown command '%s' (see \"notmuch help\")\n",
command_name);
ret = EXIT_FAILURE;
goto DONE;
}