Set the spell checking language accroding the value of the magic comm…

lib/linter-provider.coffee

@@ -19,6 +19,22 @@ module.exports = class LinterProvider
           console.log data
 
 
+  magicCommentLanguageSetting = (content) ->
+    magicCommentPattern = ///
+      \%\s*!TeX\s* # Starting with %!TeX
+      spellcheck\s*=\s*
+      ([\w-]+) # capture language setting
+    ///ig # ignore Case
+
+    match = magicCommentPattern.exec content
+    if match
+      lang = match[1].replace /_/, '-'
+    else
+      'auto'
+
+
+
+
   lint: (TextEditor) ->
     new Promise (Resolve) ->
       received = ""
@@ -40,8 +56,11 @@ module.exports = class LinterProvider
         lthostname = 'languagetool.org'
         ltport = 443
 
+      language = magicCommentLanguageSetting editorContent
+      console.log language
+
       post_data_dict = {
-        'language': 'auto'
+        'language': language
         'text': editorContent
         'motherTongue': atom.config.get 'linter-languagetool.motherTongue'
       }

spec/linter-languagetool-spec.js

@@ -49,4 +49,25 @@ describe('The languagetool-linter for AtomLinter', () => {
       });
     });
   });
+
+  it('checks an mixed language example text taken from the languagetool homepage with TeX magic comment to define the language', () => {
+    waitsForPromise(() => {
+      return atom.workspace.open(__dirname + '/test_files/languagetool-mc-test.txt').then(editor => {
+        return lint(editor).then(messages => {
+          expect(messages.length).toEqual(22);
+
+          expect(messages[21].severity).toBeDefined();
+          expect(messages[21].severity).toEqual('error');
+          expect(messages[21].excerpt).toBeDefined();
+          expect(messages[21].excerpt).toEqual('Rechtschreibfehler');
+          expect(messages[21].location.file).toBeDefined();
+          expect(messages[21].location.file).toMatch(/.+languagetool-mc-test\.txt$/);
+          expect(messages[21].location.position).toBeDefined();
+          expect(messages[21].location.position.length).toEqual(2);
+          expect(messages[21].location.position).toEqual([[6, 0], [6, 6]]);
+        });
+      });
+    });
+  });
+
 });

spec/test_files/languagetool-mc-test.txt

@@ -0,0 +1,7 @@
+% !TeX spellcheck = de_DE
+
+Paste your own text here and click the 'Check Text' button.
+Click the colored phrases for details on potential errors.
+
+
+Füghen Sie hier Ihren Text ein.