1 files changed, 83 insertions, 0 deletions
diff --git a/tools/lint/hooks_js_format.py b/tools/lint/hooks_js_format.py
new file mode 100755
index 0000000000..1b0386685e
--- /dev/null
+++ b/tools/lint/hooks_js_format.py
@@ -0,0 +1,83 @@
+#!/usr/bin/env python3
+# 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
+import subprocess
+import sys
+from subprocess import CalledProcessError, check_output
+
+here = os.path.dirname(os.path.realpath(__file__))
+topsrcdir = os.path.join(here, os.pardir, os.pardir)
+
+EXTRA_PATHS = (
+    "python/mach",
+    "python/mozbuild",
+    "python/mozversioncontrol",
+    "testing/mozbase/mozfile",
+    "third_party/python/jsmin",
+)
+sys.path[:0] = [os.path.join(topsrcdir, p) for p in EXTRA_PATHS]
+
+from mozversioncontrol import InvalidRepoPath, get_repository_object
+
+
+def run_js_format(hooktype, changedFiles):
+    try:
+        vcs = get_repository_object(topsrcdir)
+    except InvalidRepoPath:
+        return
+
+    if not changedFiles:
+        # No files have been touched
+        return
+
+    extensions = (".js", ".jsx", ".jsm", ".json", ".mjs", "sjs", "html", "xhtml")
+    path_list = []
+    for filename in sorted(changedFiles):
+        # Ignore files unsupported in eslint and prettier
+        if filename.endswith(extensions):
+            path_list.append(filename)
+
+    if not path_list:
+        # No files have been touched
+        return
+
+    arguments = ["eslint", "--fix"] + path_list
+    # On windows we need this to call the command in a shell, see Bug 1511594
+    if os.name == "nt":
+        js_format_cmd = ["sh", "mach"] + arguments
+    else:
+        js_format_cmd = [os.path.join(topsrcdir, "mach")] + arguments
+    if "commit" in hooktype:
+        # don't prevent commits, just display the eslint and prettier results
+        subprocess.call(js_format_cmd)
+
+        vcs.add_remove_files(*path_list)
+
+        return False
+    print("warning: '{}' is not a valid js-format hooktype".format(hooktype))
+    return False
+
+
+def git():
+    hooktype = os.path.basename(__file__)
+    if hooktype == "hooks_js_format.py":
+        hooktype = "pre-push"
+
+    try:
+        changedFiles = check_output(
+            ["git", "diff", "--staged", "--diff-filter=d", "--name-only", "HEAD"],
+            text=True,
+        ).split()
+        # TODO we should detect if we are in a "add -p" mode and show a warning
+        return run_js_format(hooktype, changedFiles)
+
+    except CalledProcessError:
+        print("Command to retrieve local files failed")
+        return 1
+
+
+if __name__ == "__main__":
+    sys.exit(git())