Trim modeline when checking it

Author: Nixinova

changelog.md

@@ -2,6 +2,7 @@
 
 ## Next
 - Fixed file extensions with multiple delimiters not being prioritised over basic extensions.
+- Fixed modeline checking not trimming comments from the first line.
 
 ## 2.5.1
 *2022-06-26*

src/index.ts

@@ -185,8 +185,9 @@ async function analyse(input?: string | string[], opts: T.Options = {}): Promise
 				// Check for interpreter match
 				const matchesInterpretor = data.interpreters?.some(interpreter => firstLine!.match(`\\b${interpreter}\\b`));
 				// Check modeline declaration
-				const matchesLang = firstLine!.toLowerCase().match(langMatcher(lang));
-				const matchesAlias = data.aliases?.some(lang => firstLine!.toLowerCase().match(langMatcher(lang)));
+				const modelineText = firstLine!.toLowerCase().replace(/^.*-\*-(.+)-\*-.*$/, '$1');
+				const matchesLang = modelineText.match(langMatcher(lang));
+				const matchesAlias = data.aliases?.some(lang => modelineText.match(langMatcher(lang)));
 				// Add language
 				const interpretorCheck = opts.checkShebang && matchesInterpretor;
 				const modelineCheck = opts.checkModeline && (matchesLang || matchesAlias);

test/unit.js

@@ -52,6 +52,7 @@ async function unitTest() {
 	await test(['emacs_cs', '# -*- c# -*-'], ['files', 'C#']);
 	await test(['vim_sh', '# vim: filetype=sh'], ['files', 'Shell']);
 	await test(['vim_ruby', '# vim: syntax = ruby'], ['files', 'Ruby']);
+	await test(['XCompose', '# for Emacs: -*- coding: utf-8 -*-'], ['files', 'XCompose'])
 	desc('heuristics');
 	await test(['c-sharp.cs', 'namespace example {} // empty'], ['files', 'C#']);
 	await test(['smalltalk.cs', '!interface methodsFor: instance'], ['files', 'Smalltalk']);