Initial commit

hooks/hooks.json

@@ -0,0 +1,17 @@
+{
+  "description": "Suggests test files when TypeScript source files are read",
+  "hooks": {
+    "PostToolUse": [
+      {
+        "matcher": "Read",
+        "hooks": [
+          {
+            "type": "command",
+            "command": "${CLAUDE_PLUGIN_ROOT}/hooks/test-file-suggest.ts",
+            "timeout": 30
+          }
+        ]
+      }
+    ]
+  }
+}

hooks/test-file-suggest.ts

@@ -0,0 +1,88 @@
+#!/usr/bin/env bun
+import { existsSync, readFileSync } from 'node:fs';
+import { basename, dirname, join } from 'node:path';
+import type { PostToolUseHookInput, SyncHookJSONOutput } from '@anthropic-ai/claude-agent-sdk';
+
+async function main() {
+	try {
+		// Read input from stdin
+		const input = readFileSync(0, 'utf-8');
+		const data: PostToolUseHookInput = JSON.parse(input);
+
+		// Check if the tool was Read
+		if (data.tool_name !== 'Read') {
+			process.exit(0);
+		}
+
+		// Get the file path from tool input
+		const toolInput = data.tool_input as Record<string, unknown>;
+		const filePath = toolInput.file_path as string;
+		if (!filePath) {
+			process.exit(0);
+		}
+
+		// Check if it's a TypeScript file (but not already a test file)
+		const isTypeScriptFile =
+			(filePath.endsWith('.ts') || filePath.endsWith('.tsx')) &&
+			!filePath.endsWith('.test.ts') &&
+			!filePath.endsWith('.test.tsx') &&
+			!filePath.endsWith('.spec.ts') &&
+			!filePath.endsWith('.spec.tsx');
+
+		if (!isTypeScriptFile) {
+			process.exit(0);
+		}
+
+		// Look for corresponding test files
+		const dir = dirname(filePath);
+		const file = basename(filePath);
+		const nameWithoutExt = file.replace(/\.tsx?$/, '');
+
+		const testPatterns = [
+			`${nameWithoutExt}.test.ts`,
+			`${nameWithoutExt}.test.tsx`,
+			`${nameWithoutExt}.spec.ts`,
+			`${nameWithoutExt}.spec.tsx`,
+		];
+
+		const foundTestFiles: string[] = [];
+		for (const pattern of testPatterns) {
+			const testPath = join(dir, pattern);
+			if (existsSync(testPath)) {
+				foundTestFiles.push(testPath);
+			}
+		}
+
+		// If test files were found, suggest them
+		if (foundTestFiles.length > 0) {
+			let context = '<plugin-langs-suggestion>\n';
+			context += `Source file: ${filePath}\n\n`;
+			context += 'Related test file(s):\n';
+			for (const testFile of foundTestFiles) {
+				context += `  → ${testFile}\n`;
+			}
+			context += '</plugin-langs-suggestion>';
+
+			// Return JSON with hookSpecificOutput for PostToolUse
+			const output: SyncHookJSONOutput = {
+				hookSpecificOutput: {
+					hookEventName: 'PostToolUse',
+					additionalContext: context,
+				},
+			};
+
+			console.log(JSON.stringify(output));
+		}
+
+		// Exit 0 = success
+		process.exit(0);
+	} catch (err) {
+		console.error('Error in test-file-suggest hook:', err);
+		process.exit(1);
+	}
+}
+
+main().catch((err) => {
+	console.error('Uncaught error:', err);
+	process.exit(1);
+});