Rearranged the code and added CLI that installs tools locally.

src/core/matcher.ts

@@ -0,0 +1,67 @@
+import { PlatformInfo } from './platform';
+
+export interface MatchOptions {
+  fileName?: string;
+  fileType?: string;
+}
+
+export function getMatchingAsset(assets: any[], platform: PlatformInfo, options: MatchOptions): any {
+  const { fileName, fileType = 'archive' } = options;
+  let extPattern: string;
+  if (fileType === 'archive') {
+    extPattern = '\\.(zip|tar\\.gz|tar|tgz|7z)';
+  } else if (fileType === 'package') {
+    extPattern = '\\.(deb|rpm|pkg)';
+  } else {
+    extPattern = fileType;
+  }
+
+  if (!fileName) {
+    // Rule 1: Default matching rule
+    const pattern = `${platform.systemPattern}[_-]${platform.archPattern}.*${extPattern}$`;
+    const regex = new RegExp(pattern, 'i');
+    const matchingAssets = assets.filter((a: any) => regex.test(a.name));
+    if (matchingAssets.length === 0) {
+      throw new Error(`No assets matched the default criteria: ${pattern}`);
+    }
+    if (matchingAssets.length > 1) {
+      throw new Error(`Multiple assets matched the default criteria: ${matchingAssets.map((a: any) => a.name).join(', ')}`);
+    }
+    return matchingAssets[0];
+  } else if (fileName.startsWith('~')) {
+    // Rule 3: Regex matching rule
+    let pattern = fileName.substring(1);
+    const hasSystem = pattern.includes('{{SYSTEM}}');
+    const hasArch = pattern.includes('{{ARCH}}');
+    const hasExt = pattern.includes('{{EXT_PATTERN}}');
+    const hasEnd = pattern.endsWith('$');
+
+    if (!hasSystem && !hasArch && !hasExt && !hasEnd) {
+      pattern += `.*{{SYSTEM}}[_-]{{ARCH}}.*{{EXT_PATTERN}}$`;
+    } else if (hasSystem && hasArch && !hasExt && !hasEnd) {
+      pattern += `.*{{EXT_PATTERN}}$`;
+    }
+
+    const finalPattern = pattern
+      .replace(/{{SYSTEM}}/g, platform.systemPattern)
+      .replace(/{{ARCH}}/g, platform.archPattern)
+      .replace(/{{EXT_PATTERN}}/g, extPattern);
+
+    const regex = new RegExp(finalPattern, 'i');
+    const matchingAssets = assets.filter((a: any) => regex.test(a.name));
+    if (matchingAssets.length === 0) {
+      throw new Error(`No assets matched the regex: ${finalPattern}`);
+    }
+    if (matchingAssets.length > 1) {
+      throw new Error(`Multiple assets matched the criteria: ${matchingAssets.map((a: any) => a.name).join(', ')}`);
+    }
+    return matchingAssets[0];
+  } else {
+    // Rule 2: Literal matching rule
+    const asset = assets.find((a: any) => a.name === fileName);
+    if (!asset) {
+      throw new Error(`No asset found matching the exact name: ${fileName}`);
+    }
+    return asset;
+  }
+}