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<?php
// initialize modules:
function module_init() {
module_list();
}
// apply function $function to every known module:
function module_iterate($function, $argument = "") {
foreach (module_list() as $name) $function($name, $argument);
}
// invoke hook $hook of module $name with optional arguments:
function module_invoke($name, $hook, $a1 = NULL, $a2 = NULL) {
$function = $name ."_". $hook;
if (function_exists($function)) {
return $function($a1, $a2);
}
}
// return array of module names (includes lazy module loading):
function module_list() {
static $list;
if (!$list) {
$handle = opendir("modules");
$list = array();
while ($file = readdir($handle)) {
if (".module" == substr($file, -7)) {
$filename = substr($file, 0, -7);
include "modules/$filename.module";
$list[$filename] = $filename;
}
}
closedir($handle);
asort($list);
}
return $list;
}
// return 1 if module $name exists, 0 otherwise:
function module_exist($name) {
$list = module_list();
return ($list[$name]) ? 1 : 0;
}
// return 1 if module $name implements hook $hook, 0 otherwise:
function module_hook($name, $hook) {
return function_exists($name ."_". $hook);
}
// rehash module-exported blocks:
function module_rehash_blocks($name) {
db_query("UPDATE blocks SET remove = '1' WHERE module = '$name'");
if ($blocks = module_invoke($name, "block")) {
foreach ($blocks as $offset=>$block) {
foreach ($block as $item=>$data) {
$block[$item] = addslashes($data);
}
if (!db_fetch_object(db_query("SELECT * FROM blocks WHERE module = '$name' AND name = '$block[info]'"))) {
db_query("INSERT INTO blocks (name, module, delta) VALUES ('$block[info]', '$name', '$offset')");
}
else {
db_query("UPDATE blocks SET delta = '$offset', remove = '0' WHERE module = '$name' AND name = '$block[info]'");
}
}
}
db_query("DELETE FROM blocks WHERE module = '$name' AND remove = '1'");
}
// rehash a module:
function module_rehash($name) {
if (module_exist($name)) {
$result = db_query("SELECT * FROM modules WHERE name = '$name'");
if (!$object = db_fetch_object($result)) {
db_query("INSERT INTO modules (name) VALUES ('$name')");
}
// rehash module-exported blocks (if necessary):
module_rehash_blocks($name);
}
else {
// remove all reference to module:
db_query("DELETE FROM modules WHERE name = '$name'");
db_query("DELETE FROM blocks WHERE module = '$name'");
}
}
?>
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