feat: allow to override preconfigured options

README.md

@@ -59,7 +59,7 @@ issueParser('Issue description, ref group/user/package#1, !2, implement #3, /dup
 ### Bitbucket format
 
 ```js
-const issueParser = require('issue-parser')
+const issueParser = require('issue-parser');
 const parse = issueParser('bitbucket');
 
 issueParser('Issue description, ref user/package#1, fixing #2. /cc @user');
@@ -76,7 +76,7 @@ issueParser('Issue description, ref user/package#1, fixing #2. /cc @user');
 ### Custom format
 
 ```js
-const issueParser = require('issue-parser')
+const issueParser = require('issue-parser');
 const parse = issueParser({referenceActions: ['complete'], issuePrefixes: ['🐛']});
 
 issueParser('Issue description, related to user/package🐛1, Complete 🐛2');
@@ -266,7 +266,7 @@ Fix #1 Fix #2a Fix a#3
 
 ## API
 
-### issueParser([options]) => parse
+### issueParser([options], [overrides]) => parse
 
 Create a [parser](#parsetext--result).
 
@@ -317,6 +317,17 @@ Default: `['issues', 'pull', 'merge_requests']`
 
 List of URL segment used to identify issues and pull requests with [full URL](#parse-references-with-full-issue-url).
 
+#### overrides
+
+Type: `Object`<br>
+Option overrides. Useful when using predefined [`options`](#options) (such as `github`, `gitlab` or `bitbucket`). The `overrides` object can define the same properties as [`options`](#options). 
+
+For example, the following will use all the `github` predefined options but with a different `hosts` option:
+```js
+const issueParser = require('issue-parser');
+const parse = issueParser('github', {hosts: ['https://custom-url.com']});
+```
+
 ### parse(text) => Result
 
 Parse an issue description and returns a [Result](#result) object.

index.js

@@ -103,12 +103,25 @@ function parse(text, regexp, mentionRegexp, {issuePrefixes, hosts, referenceActi
 	return results;
 }
 
-module.exports = options => {
-	if (options !== undefined && !isString(options) && !isPlainObject(options)) {
+module.exports = (options = 'default', overrides = {}) => {
+	if (!isString(options) && !isPlainObject(options)) {
 		throw new TypeError('Options must be a String or an Object');
 	}
 
-	const opts = Object.assign({}, hostConfig.default, isString(options) ? hostConfig[options.toLowerCase()] : options);
+	if (isString(options) && !includesIgnoreCase(Object.keys(hostConfig), options)) {
+		throw new TypeError(`The supported configuration are [${Object.keys(hostConfig).join(', ')}], got '${options}'`);
+	}
+
+	if (!isPlainObject(overrides)) {
+		throw new TypeError('Override must be an Object');
+	}
+
+	const opts = Object.assign(
+		{},
+		hostConfig.default,
+		isString(options) ? hostConfig[options.toLowerCase()] : options,
+		overrides
+	);
 
 	for (const opt of Object.keys(opts)) {
 		if (isString(opts[opt])) {

test/index.test.js

@@ -135,6 +135,35 @@ test('Parse with custom options', t => {
 	);
 });
 
+test('Parse with options overrides', t => {
+	t.deepEqual(
+		m('default', {
+			referenceActions: ['fix'],
+			duplicateActions: [],
+			mentionsPrefixes: '!',
+			issuePrefixes: ['#'],
+			hosts: ['http://host1.com/', 'http://host2.com'],
+			issueURLSegments: ['bugs'],
+		})(
+			'Fix #1 reSOLved gh-2 CLOSES Gh-3 fixed o/r#4 #5 o/r#6 fixing #7 http://host1.com/o/r/bugs/8 http://host2.com/o/r/bugs/9 Duplicate OF #10 !user @other'
+		),
+		{
+			actions: [{raw: 'Fix #1', action: 'Fix', slug: undefined, prefix: '#', issue: '1'}],
+			refs: [
+				{raw: 'o/r#4', slug: 'o/r', prefix: '#', issue: '4'},
+				{raw: '#5', slug: undefined, prefix: '#', issue: '5'},
+				{raw: 'o/r#6', slug: 'o/r', prefix: '#', issue: '6'},
+				{raw: '#7', slug: undefined, prefix: '#', issue: '7'},
+				{raw: 'http://host1.com/o/r/bugs/8', slug: 'o/r', prefix: undefined, issue: '8'},
+				{raw: 'http://host2.com/o/r/bugs/9', slug: 'o/r', prefix: undefined, issue: '9'},
+				{raw: '#10', slug: undefined, prefix: '#', issue: '10'},
+			],
+			duplicates: [],
+			mentions: [{raw: '!user', prefix: '!', user: 'user'}],
+		}
+	);
+});
+
 test('"allRefs" returns "refs", "actions" and "duplicates"', t => {
 	t.deepEqual(m('github')('Fix #1 #2 Duplicate of #3').allRefs, [
 		{raw: 'Fix #1', action: 'Fix', slug: undefined, prefix: '#', issue: '1'},
@@ -269,12 +298,22 @@ test('Empty String', t => {
 });
 
 test('Throw TypeError for invalid options', t => {
+	t.throws(() => m('missing-option'), TypeError);
 	t.throws(() => m([]), TypeError);
 	t.throws(() => m(1), TypeError);
 	t.throws(() => m({referenceActions: 1}), TypeError);
 	t.throws(() => m({referenceActions: [1]}), TypeError);
 });
 
+test('Throw TypeError for invalid overrides', t => {
+	t.throws(() => m({}, []), TypeError);
+	t.throws(() => m({}, 1), TypeError);
+	t.throws(() => m({}, {referenceActions: 1}), TypeError);
+	t.throws(() => m({}, {referenceActions: [1]}), TypeError);
+	t.throws(() => m({}, ''), TypeError);
+	t.throws(() => m({}, 'string'), TypeError);
+});
+
 test('Throw TypeError for invalid input', t => {
 	t.throws(() => m()(), TypeError);
 	t.throws(() => m()(1), TypeError);