1 files changed, 50 insertions, 0 deletions
diff --git a/python/mozlint/mozlint/formatters/summary.py b/python/mozlint/mozlint/formatters/summary.py
new file mode 100644
index 0000000000..e6ecf37508
--- /dev/null
+++ b/python/mozlint/mozlint/formatters/summary.py
@@ -0,0 +1,50 @@
+# 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 os
+from collections import defaultdict
+
+import mozpack.path as mozpath
+
+from ..util.string import pluralize
+
+
+class SummaryFormatter(object):
+    def __init__(self, depth=None):
+        self.depth = depth or int(os.environ.get("MOZLINT_SUMMARY_DEPTH", 1))
+
+    def __call__(self, result):
+        paths = set(
+            list(result.issues.keys()) + list(result.suppressed_warnings.keys())
+        )
+
+        commonprefix = mozpath.commonprefix([mozpath.abspath(p) for p in paths])
+        commonprefix = commonprefix.rsplit("/", 1)[0] + "/"
+
+        summary = defaultdict(lambda: [0, 0])
+        for path in paths:
+            abspath = mozpath.abspath(path)
+            assert abspath.startswith(commonprefix)
+
+            if abspath != commonprefix:
+                parts = mozpath.split(mozpath.relpath(abspath, commonprefix))[
+                    : self.depth
+                ]
+                abspath = mozpath.join(commonprefix, *parts)
+
+            summary[abspath][0] += len(
+                [r for r in result.issues[path] if r.level == "error"]
+            )
+            summary[abspath][1] += len(
+                [r for r in result.issues[path] if r.level == "warning"]
+            )
+            summary[abspath][1] += result.suppressed_warnings[path]
+
+        msg = []
+        for path, (errors, warnings) in sorted(summary.items()):
+            warning_str = (
+                ", {}".format(pluralize("warning", warnings)) if warnings else ""
+            )
+            msg.append("{}: {}{}".format(path, pluralize("error", errors), warning_str))
+        return "\n".join(msg)