1 files changed, 156 insertions, 0 deletions
diff --git a/tools/lint/eslint/__init__.py b/tools/lint/eslint/__init__.py
new file mode 100644
index 0000000000..af3f5efc56
--- /dev/null
+++ b/tools/lint/eslint/__init__.py
@@ -0,0 +1,156 @@
+# -*- Mode: python; c-basic-offset: 4; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# 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 json
+import os
+import signal
+import subprocess
+import sys
+
+sys.path.append(os.path.join(os.path.dirname(__file__), "eslint"))
+from eslint import setup_helper
+from mozbuild.nodeutil import find_node_executable
+from mozlint import result
+
+ESLINT_ERROR_MESSAGE = """
+An error occurred running eslint. Please check the following error messages:
+
+{}
+""".strip()
+
+ESLINT_NOT_FOUND_MESSAGE = """
+Could not find eslint!  We looked at the --binary option, at the ESLINT
+environment variable, and then at your local node_modules path. Please Install
+eslint and needed plugins with:
+
+mach eslint --setup
+
+and try again.
+""".strip()
+
+
+def setup(root, **lintargs):
+    setup_helper.set_project_root(root)
+
+    if not setup_helper.check_node_executables_valid():
+        return 1
+
+    return setup_helper.eslint_maybe_setup()
+
+
+def lint(paths, config, binary=None, fix=None, rules=[], setup=None, **lintargs):
+    """Run eslint."""
+    log = lintargs["log"]
+    setup_helper.set_project_root(lintargs["root"])
+    module_path = setup_helper.get_project_root()
+
+    # Valid binaries are:
+    #  - Any provided by the binary argument.
+    #  - Any pointed at by the ESLINT environmental variable.
+    #  - Those provided by |mach lint --setup|.
+
+    if not binary:
+        binary, _ = find_node_executable()
+
+    if not binary:
+        print(ESLINT_NOT_FOUND_MESSAGE)
+        return 1
+
+    extra_args = lintargs.get("extra_args") or []
+    exclude_args = []
+    for path in config.get("exclude", []):
+        exclude_args.extend(
+            ["--ignore-pattern", os.path.relpath(path, lintargs["root"])]
+        )
+
+    for rule in rules:
+        extra_args.extend(["--rule", rule])
+
+    cmd_args = (
+        [
+            binary,
+            os.path.join(module_path, "node_modules", "eslint", "bin", "eslint.js"),
+            # This keeps ext as a single argument.
+            "--ext",
+            "[{}]".format(",".join(config["extensions"])),
+            "--format",
+            "json",
+            "--no-error-on-unmatched-pattern",
+        ]
+        + rules
+        + extra_args
+        + exclude_args
+        + paths
+    )
+    log.debug("Command: {}".format(" ".join(cmd_args)))
+    results = run(cmd_args, config)
+    fixed = 0
+    # eslint requires that --fix be set before the --ext argument.
+    if fix:
+        fixed += len(results)
+        cmd_args.insert(2, "--fix")
+        results = run(cmd_args, config)
+        fixed = fixed - len(results)
+
+    return {"results": results, "fixed": fixed}
+
+
+def run(cmd_args, config):
+
+    shell = False
+    if (
+        os.environ.get("MSYSTEM") in ("MINGW32", "MINGW64")
+        or "MOZILLABUILD" in os.environ
+    ):
+        # The eslint binary needs to be run from a shell with msys
+        shell = True
+    encoding = "utf-8"
+
+    orig = signal.signal(signal.SIGINT, signal.SIG_IGN)
+    proc = subprocess.Popen(
+        cmd_args, shell=shell, stdout=subprocess.PIPE, stderr=subprocess.PIPE
+    )
+    signal.signal(signal.SIGINT, orig)
+
+    try:
+        output, errors = proc.communicate()
+    except KeyboardInterrupt:
+        proc.kill()
+        return []
+
+    if errors:
+        errors = errors.decode(encoding, "replace")
+        print(ESLINT_ERROR_MESSAGE.format(errors))
+
+    if proc.returncode >= 2:
+        return 1
+
+    if not output:
+        return []  # no output means success
+    output = output.decode(encoding, "replace")
+    try:
+        jsonresult = json.loads(output)
+    except ValueError:
+        print(ESLINT_ERROR_MESSAGE.format(output))
+        return 1
+
+    results = []
+    for obj in jsonresult:
+        errors = obj["messages"]
+
+        for err in errors:
+            err.update(
+                {
+                    "hint": err.get("fix"),
+                    "level": "error" if err["severity"] == 2 else "warning",
+                    "lineno": err.get("line") or 0,
+                    "path": obj["filePath"],
+                    "rule": err.get("ruleId"),
+                }
+            )
+            results.append(result.from_config(config, **err))
+
+    return results