better plugin check

src/install-plugin.ts

@@ -41,13 +41,17 @@ async function getPackageJsonPackages() {
   return dependencies;
 }
 
-async function checkPluginExists(name: string) {
+async function checkPluginExists(
+  name: string,
+  allowCommunity: boolean,
+  allowOfficial: boolean,
+) {
   const deps = await getPackageJsonPackages();
   const entry = Object.entries(deps).find(
     ([packageName, version]) =>
       packageName === name ||
-      packageName === `@koishijs/plugin-${name}` ||
-      packageName.endsWith(`koishi-plugin-${name}`),
+      (allowOfficial && packageName === `@koishijs/plugin-${name}`) ||
+      (allowCommunity && packageName.endsWith(`koishi-plugin-${name}`)),
   );
   if (!entry) {
     return;
@@ -90,7 +94,17 @@ async function installPlugin(name: string, info: any) {
     return;
   }
   logger.info(`Installing plugin ${name}@${version || 'unknown'}.`);
-  const existingPluginVersion = await checkPluginExists(name);
+  const allowCommunity = !info.$official;
+  const allowOfficial = !info.$community;
+  if (!allowCommunity && !allowOfficial) {
+    logger.warn(`Plugin ${name} is neither official nor community, skipping.`);
+    return;
+  }
+  const existingPluginVersion = await checkPluginExists(
+    name,
+    allowCommunity,
+    allowOfficial,
+  );
   if (
     existingPluginVersion &&
     (existingPluginVersion === version || !version)
@@ -105,10 +119,10 @@ async function installPlugin(name: string, info: any) {
   if (name.includes(communityPrefix) || name.startsWith(officialPrefix)) {
     installList.push(`${name}@${installVersion}`);
   } else {
-    if (!info.$community) {
+    if (allowOfficial) {
       installList.push(`${officialPrefix}${name}@${installVersion}`);
     }
-    if (!info.$official) {
+    if (allowCommunity) {
       installList.push(`${communityPrefix}${name}@${installVersion}`);
     }
   }