Add: SASSLintBear

Closes coala#982

bear-requirements.yaml

@@ -59,6 +59,8 @@ npm_requirements:
     version: ~5
   remark-validate-links:
     version: ~5
+  sass-lint:
+    version: ~1.12.1
   standard:
     version: ~10
   stylelint:

bears/scss/SASSLintBear.py

@@ -0,0 +1,56 @@
+import json
+import os
+
+from coalib.bearlib.abstractions.Linter import linter
+from dependency_management.requirements.NpmRequirement import NpmRequirement
+from coalib.results.RESULT_SEVERITY import RESULT_SEVERITY
+from coalib.results.Result import Result
+
+
+@linter(executable='sass-lint')
+class SASSLintBear:
+    """
+    Check SCSS/SASS code to keep it clean and readable.
+    """
+
+    LANGUAGES = {'SCSS', 'SASS'}
+    REQUIREMENTS = {NpmRequirement('sass-lint', '1.12.1')}
+    AUTHORS = {'The coala developers'}
+    AUTHORS_EMAILS = {'coala-devel@googlegroups.com'}
+    LICENSE = 'AGPL-3.0'
+    CAN_DETECT = {'Syntax', 'Formatting'}
+    SEE_MORE = 'https://github.com/sasstools/sass-lint'
+
+    severity_map = {2: RESULT_SEVERITY.MAJOR,
+                    1: RESULT_SEVERITY.NORMAL,
+                    0: RESULT_SEVERITY.INFO}
+
+    @staticmethod
+    def create_arguments(filename, file, config_file,
+                         sasslint_config: str = ''):
+        """
+        :param sasslint_config: The location of the sass-lint config file.
+        """
+        args = tuple()
+        if os.path.splitext(filename)[1] == '.scss':
+            args += ('--syntax=scss',)
+        if sasslint_config:
+            args += ('--config=' + sasslint_config,)
+        args += ('--format=json', '--verbose', '--no-exit', filename)
+        return args
+
+    def process_output(self, output, filename, file):
+        if not file or not output:
+            return
+
+        output = json.loads(output)
+
+        for result in output[0]['messages']:
+            origin = (
+                '{class_name} ({rule})'.format(class_name=type(self).__name__,
+                                               rule=result['ruleId'])
+                if result['ruleId'] is not None else self)
+            yield Result.from_values(
+                origin=origin, message=result['message'],
+                file=filename, line=result['line'], diffs=None,
+                severity=self.severity_map[result['severity']])

package.json

@@ -24,6 +24,7 @@
     "remark-cli": "~2",
     "remark-lint": "~5",
     "remark-validate-links": "~5",
+    "sass-lint": "~1.12.1",
     "standard": "~10",
     "stylelint": "~7",
     "stylint": "~1.5.9",

tests/scss/SASSLintBearTest.py

@@ -0,0 +1,111 @@
+import os
+
+from bears.scss.SASSLintBear import SASSLintBear
+from coalib.testing.LocalBearTestHelper import verify_local_bear
+
+# Test examples from http://sass-lang.com/guide
+good_sass_file = '''
+nav
+  ul
+    list-style: none
+    margin: 0
+    padding: 0
+
+  li
+    display: inline-block
+
+  a
+    display: block
+    padding: 6px 12px
+    text-decoration: none
+'''
+
+bad_sass_file = '''
+nav
+  ul
+    margin: 0
+    padding: 0 !important
+    err-style: none
+
+  li
+    display: inline-block
+
+  a
+    display: block
+    padding: 6px 12px
+    text-decoration: none
+'''
+
+good_sass_file_with_config = '''
+nav
+  ul
+    margin: 0
+    padding: 0 !important
+
+  li
+    display: inline-block
+'''
+
+good_scss_file = """
+nav {
+  ul {
+    list-style: none;
+    margin: 0;
+    padding: 0;
+  }
+
+  li { display: inline-block; }
+
+  a {
+    display: block;
+    padding: 6px 12px;
+    text-decoration: none;
+  }
+}
+"""
+
+bad_scss_file = """
+nav {
+  ul {
+    margin: 0
+    padding: 0
+    list-style: none
+  }
+
+  li { display: inline-block; }
+
+  a {
+    display: block;
+    padding: 6px 12px;
+    text-decoration: none;
+}
+"""
+
+test_dir = os.path.join(os.path.dirname(__file__), 'test_files')
+
+SASSLintBearTest = verify_local_bear(
+    SASSLintBear,
+    valid_files=(good_sass_file,),
+    invalid_files=(bad_sass_file,),
+    tempfile_kwargs={'suffix': '.sass'})
+
+SASSLintBearSCSSTest = verify_local_bear(
+    SASSLintBear,
+    valid_files=(good_scss_file,),
+    invalid_files=(bad_scss_file,),
+    tempfile_kwargs={'suffix': '.scss'})
+
+SASSLintBearConfigTest = verify_local_bear(
+    SASSLintBear,
+    valid_files=(good_sass_file_with_config,),
+    invalid_files=(bad_sass_file,),
+    tempfile_kwargs={'suffix': '.sass'},
+    settings={'sasslint_config': os.path.join(test_dir, 'sass-lint.yml')})
+
+SASSLintBearEmptyFileTest = verify_local_bear(
+    SASSLintBear,
+    valid_files=('',),
+    invalid_files=tuple(),
+    filename=os.path.join(test_dir, 'test.scss'),
+    tempfile_kwargs={'suffix': '.scss'},
+    create_tempfile=False)

tests/scss/test_files/sass-lint.yml

@@ -0,0 +1,4 @@
+# Config file to allow !important to ensure it's loaded
+
+rules:
+  no-important: 0