feat: Add support for .roorules configuration files

- Add .roorules to the list of supported rule files
- Improve mode-specific rule file handling to prioritize .roorules over .clinerules
- Update file loading logic to track which rule file was successfully loaded
- Add test cases for .roorules functionality

This change maintains backward compatibility with existing .clinerules while
introducing support for the new .roorules format as the preferred configuration
method.

Author: upamune

src/core/prompts/sections/__tests__/custom-instructions.test.ts

@@ -15,7 +15,8 @@ describe("loadRuleFiles", () => {
 		const result = await loadRuleFiles("/fake/path")
 		expect(mockedFs.readFile).toHaveBeenCalled()
 		expect(result).toBe(
-			"\n# Rules from .clinerules:\ncontent with spaces\n" +
+			"\n# Rules from .roorules:\ncontent with spaces\n" +
+				"\n# Rules from .clinerules:\ncontent with spaces\n" +
 				"\n# Rules from .cursorrules:\ncontent with spaces\n" +
 				"\n# Rules from .windsurfrules:\ncontent with spaces\n",
 		)
@@ -51,6 +52,9 @@ describe("loadRuleFiles", () => {
 
 	it("should combine content from multiple rule files when they exist", async () => {
 		mockedFs.readFile.mockImplementation(((filePath: string | Buffer | URL | number) => {
+			if (filePath.toString().endsWith(".roorules")) {
+				return Promise.resolve("roo rules content")
+			}
 			if (filePath.toString().endsWith(".clinerules")) {
 				return Promise.resolve("cline rules content")
 			}
@@ -62,7 +66,8 @@ describe("loadRuleFiles", () => {
 
 		const result = await loadRuleFiles("/fake/path")
 		expect(result).toBe(
-			"\n# Rules from .clinerules:\ncline rules content\n" +
+			"\n# Rules from .roorules:\nroo rules content\n" +
+				"\n# Rules from .clinerules:\ncline rules content\n" +
 				"\n# Rules from .cursorrules:\ncursor rules content\n",
 		)
 	})
@@ -86,6 +91,9 @@ describe("loadRuleFiles", () => {
 
 	it("should skip directories with same name as rule files", async () => {
 		mockedFs.readFile.mockImplementation(((filePath: string | Buffer | URL | number) => {
+			if (filePath.toString().endsWith(".roorules")) {
+				return Promise.reject({ code: "EISDIR" })
+			}
 			if (filePath.toString().endsWith(".clinerules")) {
 				return Promise.reject({ code: "EISDIR" })
 			}
@@ -121,7 +129,7 @@ describe("addCustomInstructions", () => {
 		expect(result).toContain("(es)") // Check for language code in parentheses
 		expect(result).toContain("Global Instructions:\nglobal instructions")
 		expect(result).toContain("Mode-specific Instructions:\nmode instructions")
-		expect(result).toContain("Rules from .clinerules-test-mode:\nmode specific rules")
+		expect(result).toContain("Rules from .roorules-test-mode:\nmode specific rules")
 	})
 
 	it("should return empty string when no instructions provided", async () => {

src/core/prompts/sections/custom-instructions.ts

@@ -17,7 +17,7 @@ async function safeReadFile(filePath: string): Promise<string> {
 }
 
 export async function loadRuleFiles(cwd: string): Promise<string> {
-	const ruleFiles = [".clinerules", ".cursorrules", ".windsurfrules"]
+	const ruleFiles = [".roorules", ".clinerules", ".cursorrules", ".windsurfrules"]
 	let combinedRules = ""
 
 	for (const file of ruleFiles) {
@@ -41,9 +41,19 @@ export async function addCustomInstructions(
 
 	// Load mode-specific rules if mode is provided
 	let modeRuleContent = ""
+	let usedRuleFile = ""
 	if (mode) {
-		const modeRuleFile = `.clinerules-${mode}`
-		modeRuleContent = await safeReadFile(path.join(cwd, modeRuleFile))
+		const rooModeRuleFile = `.roorules-${mode}`
+		modeRuleContent = await safeReadFile(path.join(cwd, rooModeRuleFile))
+		if (modeRuleContent) {
+			usedRuleFile = rooModeRuleFile
+		} else {
+			const clineModeRuleFile = `.clinerules-${mode}`
+			modeRuleContent = await safeReadFile(path.join(cwd, clineModeRuleFile))
+			if (modeRuleContent) {
+				usedRuleFile = clineModeRuleFile
+			}
+		}
 	}
 
 	// Add language preference if provided
@@ -69,8 +79,7 @@ export async function addCustomInstructions(
 
 	// Add mode-specific rules first if they exist
 	if (modeRuleContent && modeRuleContent.trim()) {
-		const modeRuleFile = `.clinerules-${mode}`
-		rules.push(`# Rules from ${modeRuleFile}:\n${modeRuleContent}`)
+		rules.push(`# Rules from ${usedRuleFile}:\n${modeRuleContent}`)
 	}
 
 	if (options.rooIgnoreInstructions) {