1 files changed, 41 insertions, 0 deletions
diff --git a/python/mozlint/mozlint/formatters/compact.py b/python/mozlint/mozlint/formatters/compact.py
new file mode 100644
index 0000000000..54ee194215
--- /dev/null
+++ b/python/mozlint/mozlint/formatters/compact.py
@@ -0,0 +1,41 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+import attr
+
+from ..result import Issue
+
+
+class CompactFormatter(object):
+    """Formatter for compact output.
+
+    This formatter prints one error per line, mimicking the
+    eslint 'compact' formatter.
+    """
+
+    # If modifying this format, please also update the vim errorformats in editor.py
+    fmt = "{path}: line {lineno}{column}, {level} - {message} ({rule})"
+
+    def __init__(self, summary=True):
+        self.summary = summary
+
+    def __call__(self, result):
+        message = []
+        num_problems = 0
+        for path, errors in sorted(result.issues.items()):
+            num_problems += len(errors)
+            for err in errors:
+                assert isinstance(err, Issue)
+
+                d = attr.asdict(err)
+                d["column"] = ", col %s" % d["column"] if d["column"] else ""
+                d["level"] = d["level"].capitalize()
+                d["rule"] = d["rule"] or d["linter"]
+                message.append(self.fmt.format(**d))
+
+        if self.summary and num_problems:
+            message.append(
+                "\n{} problem{}".format(num_problems, "" if num_problems == 1 else "s")
+            )
+        return "\n".join(message)