feat(rules): add scope-delimiter-style

@commitlint/rules/src/index.ts

@@ -18,6 +18,7 @@ import { headerMinLength } from "./header-min-length.js";
 import { headerTrim } from "./header-trim.js";
 import { referencesEmpty } from "./references-empty.js";
 import { scopeCase } from "./scope-case.js";
+import { scopeDelimiterStyle } from "./scope-delimiter-style.js";
 import { scopeEmpty } from "./scope-empty.js";
 import { scopeEnum } from "./scope-enum.js";
 import { scopeMaxLength } from "./scope-max-length.js";
@@ -57,6 +58,7 @@ export default {
 	"header-trim": headerTrim,
 	"references-empty": referencesEmpty,
 	"scope-case": scopeCase,
+	"scope-delimiter-style": scopeDelimiterStyle,
 	"scope-empty": scopeEmpty,
 	"scope-enum": scopeEnum,
 	"scope-max-length": scopeMaxLength,

@commitlint/rules/src/scope-case.test.ts

@@ -322,3 +322,64 @@ test('with slash in subject should succeed for "always sentence case"', async ()
 	const expected = true;
 	expect(actual).toEqual(expected);
 });
+
+test("with object-based configuration should use default delimiters", async () => {
+	const commit = await parse("feat(scope/my-scope, shared-scope): subject");
+	const [actual] = scopeCase(commit, "always", {
+		cases: ["kebab-case"],
+	});
+	const expected = true;
+	expect(actual).toEqual(expected);
+});
+
+test("with object-based configuration should support custom single delimiter", async () => {
+	const commit = await parse("feat(scope|my-scope): subject");
+	const [actual] = scopeCase(commit, "always", {
+		cases: ["kebab-case"],
+		delimiters: ["|"],
+	});
+	const expected = true;
+	expect(actual).toEqual(expected);
+});
+
+test("with object-based configuration should support multiple custom delimiters", async () => {
+	const commit = await parse(
+		"feat(scope|my-scope/shared-scope,common-scope): subject",
+	);
+	const [actual] = scopeCase(commit, "always", {
+		cases: ["kebab-case"],
+		delimiters: ["|", "/", ","],
+	});
+	const expected = true;
+	expect(actual).toEqual(expected);
+});
+
+test("with object-based configuration should fall back to default delimiters when empty array provided", async () => {
+	const commit = await parse("feat(scope/my-scope): subject");
+	const [actual] = scopeCase(commit, "always", {
+		cases: ["kebab-case"],
+		delimiters: [],
+	});
+	const expected = true;
+	expect(actual).toEqual(expected);
+});
+
+test("with object-based configuration should handle special delimiters", async () => {
+	const commit = await parse("feat(scope*my-scope): subject");
+	const [actual] = scopeCase(commit, "always", {
+		cases: ["kebab-case"],
+		delimiters: ["*"],
+	});
+	const expected = true;
+	expect(actual).toEqual(expected);
+});
+
+test('with object-based configuration should respect "never" when custom delimiter is used', async () => {
+	const commit = await parse("feat(scope|my-scope): subject");
+	const [actual] = scopeCase(commit, "never", {
+		cases: ["kebab-case"],
+		delimiters: ["|"],
+	});
+	const expected = false;
+	expect(actual).toEqual(expected);
+});

@commitlint/rules/src/scope-case.ts

@@ -4,18 +4,29 @@ import { TargetCaseType, SyncRule } from "@commitlint/types";
 
 const negated = (when?: string) => when === "never";
 
-export const scopeCase: SyncRule<TargetCaseType | TargetCaseType[]> = (
-	parsed,
-	when = "always",
-	value = [],
-) => {
+export const scopeCase: SyncRule<
+	| TargetCaseType
+	| TargetCaseType[]
+	| {
+			cases: TargetCaseType[];
+			delimiters?: string[];
+	  }
+> = (parsed, when = "always", value = []) => {
 	const { scope } = parsed;
 
 	if (!scope) {
 		return [true];
 	}
+	const isObjectBasedConfiguration =
+		!Array.isArray(value) && !(typeof value === "string");
 
-	const checks = (Array.isArray(value) ? value : [value]).map((check) => {
+	const checks = (
+		isObjectBasedConfiguration
+			? value.cases
+			: Array.isArray(value)
+				? value
+				: [value]
+	).map((check) => {
 		if (typeof check === "string") {
 			return {
 				when: "always",
@@ -25,14 +36,22 @@ export const scopeCase: SyncRule<TargetCaseType | TargetCaseType[]> = (
 		return check;
 	});
 
-	// Scopes may contain slash or comma delimiters to separate them and mark them as individual segments.
-	// This means that each of these segments should be tested separately with `ensure`.
-	const delimiters = /\/|\\|, ?/g;
-	const scopeSegments = scope.split(delimiters);
+	const delimiters =
+		isObjectBasedConfiguration && value.delimiters?.length
+			? value.delimiters
+			: ["/", "\\", ","];
+	const delimiterPatterns = delimiters.map((delimiter) => {
+		return delimiter === ","
+			? ", ?"
+			: delimiter.replace(/[.*+?^${}()|[\]\\]/g, "\\$&");
+	});
+	const delimiterRegex = new RegExp(delimiterPatterns.join("|"));
+	const scopeSegments = scope.split(delimiterRegex);
 
 	const result = checks.some((check) => {
 		const r = scopeSegments.every(
-			(segment) => delimiters.test(segment) || ensureCase(segment, check.case),
+			(segment) =>
+				delimiterRegex.test(segment) || ensureCase(segment, check.case),
 		);
 
 		return negated(check.when) ? !r : r;

@commitlint/rules/src/scope-delimiter-style.test.ts

@@ -0,0 +1,194 @@
+import { describe, test, expect } from "vitest";
+import parse from "@commitlint/parse";
+import { scopeDelimiterStyle } from "./scope-delimiter-style.js";
+
+const messages = {
+	noScope: "feat: subject",
+
+	kebabScope: "feat(lint-staged): subject",
+	snakeScope: "feat(my_scope): subject",
+
+	defaultSlash: "feat(core/api): subject",
+	defaultComma: "feat(core,api): subject",
+	defaultCommaSpace: "feat(core, api): subject",
+	defaultBackslash: "feat(core\\api): subject",
+
+	nonDefaultPipe: "feat(core|api): subject",
+	nonDefaultStar: "feat(core*api): subject",
+	mixedCustom: "feat(core|api/utils): subject",
+} as const;
+
+describe("Scope Delimiter Validation", () => {
+	describe("Messages without scopes", () => {
+		test('Succeeds for "always" when there is no scope', async () => {
+			const [actual, error] = scopeDelimiterStyle(
+				await parse(messages.noScope),
+				"always",
+			);
+
+			expect(actual).toEqual(true);
+			expect(error).toEqual(undefined);
+		});
+
+		test('Succeeds for "never" when there is no scope', async () => {
+			const [actual, error] = scopeDelimiterStyle(
+				await parse(messages.noScope),
+				"never",
+			);
+
+			expect(actual).toEqual(true);
+			expect(error).toEqual(undefined);
+		});
+	});
+
+	describe('"always" with default configuration', () => {
+		test.each([
+			{ scenario: "kebab-case scope", commit: messages.kebabScope },
+			{ scenario: "snake_case scope", commit: messages.snakeScope },
+		] as const)(
+			"Treats $scenario as part of the scope and not a delimiter",
+			async ({ commit }) => {
+				const [actual, error] = scopeDelimiterStyle(
+					await parse(commit),
+					"always",
+				);
+
+				expect(actual).toEqual(true);
+				expect(error).toEqual("scope delimiters must be one of [/, \\, ,]");
+			},
+		);
+
+		test.each([
+			{ scenario: "comma ',' delimiter", commit: messages.defaultComma },
+			{ scenario: "slash '/' delimiter", commit: messages.defaultSlash },
+			{
+				scenario: "backslash '\\' delimiter",
+				commit: messages.defaultBackslash,
+			},
+		] as const)("Succeeds when only $scenario is used", async ({ commit }) => {
+			const [actual, error] = scopeDelimiterStyle(
+				await parse(commit),
+				"always",
+			);
+
+			expect(actual).toEqual(true);
+			expect(error).toEqual("scope delimiters must be one of [/, \\, ,]");
+		});
+
+		test.each([
+			{ scenario: "comma without space", commit: messages.defaultComma },
+			{ scenario: "comma with space", commit: messages.defaultCommaSpace },
+		] as const)(
+			"Normalizes $scenario as the same delimiter ','",
+			async ({ commit }) => {
+				const [actual, error] = scopeDelimiterStyle(
+					await parse(commit),
+					"always",
+				);
+
+				expect(actual).toEqual(true);
+				expect(error).toEqual("scope delimiters must be one of [/, \\, ,]");
+			},
+		);
+
+		test("Fails when a non-default delimiter is used", async () => {
+			const [actual, error] = scopeDelimiterStyle(
+				await parse(messages.nonDefaultStar),
+				"always",
+			);
+
+			expect(actual).toEqual(false);
+			expect(error).toEqual("scope delimiters must be one of [/, \\, ,]");
+		});
+	});
+
+	describe('"never" with default configuration', () => {
+		test("Fails when scope uses only default delimiters", async () => {
+			const [actual, error] = scopeDelimiterStyle(
+				await parse(messages.defaultSlash),
+				"never",
+			);
+
+			expect(actual).toEqual(false);
+			expect(error).toEqual("scope delimiters must not be one of [/, \\, ,]");
+		});
+
+		test("Succeeds when scope uses only non-default delimiter", async () => {
+			const [actual, error] = scopeDelimiterStyle(
+				await parse(messages.nonDefaultPipe),
+				"never",
+			);
+
+			expect(actual).toEqual(true);
+			expect(error).toEqual("scope delimiters must not be one of [/, \\, ,]");
+		});
+	});
+
+	describe("Custom configuration", () => {
+		test("Falls back to default delimiters when delimiters is an empty array", async () => {
+			const [actual, error] = scopeDelimiterStyle(
+				await parse(messages.defaultComma),
+				"always",
+				[],
+			);
+
+			expect(actual).toEqual(true);
+			expect(error).toEqual("scope delimiters must be one of [/, \\, ,]");
+		});
+
+		test("Succeeds when a custom single allowed delimiter is used", async () => {
+			const [actual, error] = scopeDelimiterStyle(
+				await parse(messages.nonDefaultStar),
+				"always",
+				["*"],
+			);
+
+			expect(actual).toEqual(true);
+			expect(error).toEqual("scope delimiters must be one of [*]");
+		});
+
+		test("Fails when ',' is used but only '/' is allowed", async () => {
+			const [actual, error] = scopeDelimiterStyle(
+				await parse(messages.defaultComma),
+				"always",
+				["/"],
+			);
+
+			expect(actual).toEqual(false);
+			expect(error).toEqual("scope delimiters must be one of [/]");
+		});
+
+		test("Succeeds when both '/' and '|' are allowed and used in the scope", async () => {
+			const [actual, error] = scopeDelimiterStyle(
+				await parse(messages.mixedCustom),
+				"always",
+				["/", "|"],
+			);
+
+			expect(actual).toEqual(true);
+			expect(error).toEqual("scope delimiters must be one of [/, |]");
+		});
+
+		test('In "never" mode fails when explicitly forbidden delimiter is used', async () => {
+			const [actual, error] = scopeDelimiterStyle(
+				await parse(messages.nonDefaultPipe),
+				"never",
+				["|"],
+			);
+
+			expect(actual).toEqual(false);
+			expect(error).toEqual("scope delimiters must not be one of [|]");
+		});
+
+		test('In "never" mode succeeds when delimiter is not in the forbidden list', async () => {
+			const [actual, error] = scopeDelimiterStyle(
+				await parse(messages.nonDefaultPipe),
+				"never",
+				["/"],
+			);
+
+			expect(actual).toEqual(true);
+			expect(error).toEqual("scope delimiters must not be one of [/]");
+		});
+	});
+});

@commitlint/rules/src/scope-delimiter-style.ts

@@ -0,0 +1,41 @@
+import * as ensure from "@commitlint/ensure";
+import message from "@commitlint/message";
+import { SyncRule } from "@commitlint/types";
+
+export const scopeDelimiterStyle: SyncRule<string[]> = (
+	{ scope },
+	when = "always",
+	value = [],
+) => {
+	if (!scope) {
+		return [true];
+	}
+
+	const delimiters = value.length ? value : ["/", "\\", ","];
+	const scopeRawDelimiters = scope.match(/[^A-Za-z0-9-_]+/g) ?? [];
+	const scopeDelimiters = [
+		...new Set(
+			scopeRawDelimiters.map((delimiter) => {
+				const trimmed = delimiter.trim();
+
+				if (trimmed === ",") {
+					return ",";
+				}
+
+				return delimiter;
+			}),
+		),
+	];
+
+	const isAllDelimitersAllowed = scopeDelimiters.every((delimiter) => {
+		return ensure.enum(delimiter, delimiters);
+	});
+	const isNever = when === "never";
+
+	return [
+		isNever ? !isAllDelimitersAllowed : isAllDelimitersAllowed,
+		message([
+			`scope delimiters must ${isNever ? "not " : ""}be one of [${delimiters.join(", ")}]`,
+		]),
+	];
+};