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/*
Shellexec plugin for DeaDBeeF
Copyright (C) 2009 Viktor Semykin <thesame.ml@gmail.com>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include "../../deadbeef.h"
#define trace(...) { fprintf(stderr, __VA_ARGS__); }
//#define trace(fmt,...)
static DB_misc_t plugin;
static DB_functions_t *deadbeef;
static DB_plugin_action_t *actions;
DB_plugin_t *
shellexec_load (DB_functions_t *api) {
deadbeef = api;
return DB_PLUGIN (&plugin);
}
static char*
trim (char* s)
{
char *h, *t;
for (h = s; *h == ' ' || *h == '\t'; h++);
for (t = s + strlen (s); *t == ' ' || *t == '\t'; t--);
* (t+1) = 0;
return h;
}
static int
shell_quote (const char *source, char *dest)
{
char *sp, *dp;
for (sp = source, dp = dest; *sp; sp++, dp++)
{
if (*sp == '\'')
{
strcpy (dp, "'\\''");
dp += 3;
}
else
*dp = *sp;
}
*dp = 0;
}
/*
format_shell_command function
Similarly to db_format_title formats track's string
and quotes all fields to make them safe for shell
%a, %t, %b, %B, %C, %n, %N, %y, %g, %c, %r are handled. Use double-% to
skip field.
Example:
Format string:
echo %a - %t %%a - %%t
Output:
echo 'Blind Faith' - 'Can'\''t Find My Way Home' %a - %t
*/
static const char*
format_shell_command (DB_playItem_t *it, const char *format)
{
char *p;
const char *trailing = format;
const char *field;
char *res, *res_p;
res = res_p = malloc (65536); //FIXME: possible heap corruption
for (;;)
{
p = strchr (trailing, '%');
if (!p) break;
switch (*(p+1))
{
case 'a': field = "artist"; break;
case 't': field = "title"; break;
case 'b': field = "album"; break;
case 'B': field = "band"; break;
case 'C': field = "composer"; break;
case 'n': field = "track"; break;
case 'N': field = "numtracks"; break;
case 'y': field = "year"; break;
case 'g': field = "genre"; break;
case 'c': field = "comment"; break;
case 'r': field = "copyright"; break;
case 'f': break;
default: field = NULL;
}
if (field == NULL)
{
int l = ((*(p+1) == '%') ? 1 : 0);
trace ("field is null; p: %s; p+1: %s; l: %d; trailing: %s; res_p: %s\n", p, p+1, l, trailing, res_p);
strncpy (res_p, trailing, p-trailing+l);
res_p += (p-trailing+l);
trailing = p+l+1;
trace ("res: %s; trailing: %s\n", res, res_p, trailing);
continue;
}
else
{
const char *meta;
if (*(p+1) == 'f')
meta = it->fname;
else
meta = deadbeef->pl_find_meta (it, field);
char quoted [strlen (meta) * 4 + 1]; //Worst case is when all chars are single quote
shell_quote (meta, quoted);
strncpy (res_p, trailing, p-trailing);
res_p += (p-trailing);
*res_p++ = '\'';
strcpy (res_p, quoted);
res_p += strlen (quoted);
*res_p++ = '\'';
trailing = p+2;
}
}
strcpy (res_p, trailing);
return res;
}
static int
shx_callback (DB_playItem_t *it, void *data)
{
const char *cmd = format_shell_command (it, data);
printf ("%s\n", cmd);
system (cmd);
free (cmd);
return 0;
}
static DB_plugin_action_t *
shx_get_actions (DB_playItem_t *unused)
{
return actions;
}
static int
shx_start ()
{
actions = NULL;
DB_plugin_action_t *prev = NULL;
DB_conf_item_t *item = deadbeef->conf_find ("shellexec.", NULL);
while (item)
{
size_t l = strlen (item->value) + 1;
char tmp[l];
strcpy (tmp, item->value);
trace ("Shellexec: %s\n", tmp);
char *semicolon = strchr (tmp, ':');
if (!semicolon)
{
fprintf (stdout, "Shellexec: wrong option <%s>\n", tmp);
continue;
}
*semicolon = 0;
DB_plugin_action_t *action = calloc (sizeof (DB_plugin_action_t), 1);
action->title = strdup (trim (semicolon + 1));
action->callback = shx_callback;
action->data = strdup (trim (tmp));
action->flags = DB_ACTION_SINGLE_TRACK | DB_ACTION_ALLOW_MULTIPLE_TRACKS;
action->next = NULL;
if (prev)
prev->next = action;
prev = action;
if (!actions)
actions = action;
item = deadbeef->conf_find ("shellexec.", item);
}
return 0;
}
// define plugin interface
static DB_misc_t plugin = {
.plugin.api_vmajor = DB_API_VERSION_MAJOR,
.plugin.api_vminor = DB_API_VERSION_MINOR,
.plugin.type = DB_PLUGIN_MISC,
.plugin.id = "shellexec",
.plugin.name = "Shell commands",
.plugin.descr = "Executes configurable shell commands for tracks",
.plugin.author = "Viktor Semykin",
.plugin.email = "thesame.ml@gmail.com",
.plugin.website = "http://deadbeef.sf.net",
.plugin.start = shx_start,
.plugin.get_actions = shx_get_actions
};
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