1 files changed, 113 insertions, 0 deletions
diff --git a/tools/lint/clippy/__init__.py b/tools/lint/clippy/__init__.py
new file mode 100644
index 0000000000..d22eea357d
--- /dev/null
+++ b/tools/lint/clippy/__init__.py
@@ -0,0 +1,113 @@
+# 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 bisect
+import json
+import os
+import signal
+import subprocess
+import sys
+
+import six
+from mozlint import result
+from mozlint.pathutils import expand_exclusions
+from mozprocess import ProcessHandler
+
+
+def in_sorted_list(l, x):
+    i = bisect.bisect_left(l, x)
+    return l[i] == x
+
+
+def handle_clippy_msg(config, line, log, base_path, files):
+    try:
+        detail = json.loads(six.ensure_text(line))
+        if "message" in detail:
+            p = detail["target"]["src_path"]
+            detail = detail["message"]
+            if "level" in detail:
+                if (
+                    detail["level"] == "error" or detail["level"] == "failure-note"
+                ) and not detail["code"]:
+                    log.debug(
+                        "Error outside of clippy."
+                        "This means that the build failed. Therefore, skipping this"
+                    )
+                    log.debug("File = {} / Detail = {}".format(p, detail))
+                    return
+                # We are in a clippy warning
+                if len(detail["spans"]) == 0:
+                    # For some reason, at the end of the summary, we can
+                    # get the following line
+                    # {'rendered': 'warning: 5 warnings emitted\n\n', 'children':
+                    # [], 'code': None, 'level': 'warning', 'message':
+                    # '5 warnings emitted', 'spans': []}
+                    # if this is the case, skip it
+                    log.debug(
+                        "Skipping the summary line {} for file {}".format(detail, p)
+                    )
+                    return
+
+                l = detail["spans"][0]
+                if not in_sorted_list(files, p):
+                    return
+                p = os.path.join(base_path, l["file_name"])
+                res = {
+                    "path": p,
+                    "level": detail["level"],
+                    "lineno": l["line_start"],
+                    "column": l["column_start"],
+                    "message": detail["message"],
+                    "hint": detail["rendered"],
+                    "rule": detail["code"]["code"],
+                    "lineoffset": l["line_end"] - l["line_start"],
+                }
+                return result.from_config(config, **res)
+
+    except json.decoder.JSONDecodeError:
+        log.debug("Could not parse the output:")
+        log.debug("clippy output: {}".format(line))
+        return
+
+
+class clippyProcess(ProcessHandler):
+    def __init__(self, *args, **kwargs):
+        kwargs["stream"] = False
+        ProcessHandler.__init__(self, *args, **kwargs)
+
+    def run(self, *args, **kwargs):
+        orig = signal.signal(signal.SIGINT, signal.SIG_IGN)
+        ProcessHandler.run(self, *args, **kwargs)
+        signal.signal(signal.SIGINT, orig)
+
+
+def lint(paths, config, fix=None, **lintargs):
+    files = list(expand_exclusions(paths, config, lintargs["root"]))
+    files.sort()
+    log = lintargs["log"]
+    results = []
+    mach_path = lintargs["root"] + "/mach"
+    march_cargo_process = subprocess.Popen(
+        [
+            sys.executable,
+            mach_path,
+            "--log-no-times",
+            "cargo",
+            "clippy",
+            "--",
+            "--message-format=json",
+        ],
+        stdout=subprocess.PIPE,
+        text=True,
+    )
+    for l in march_cargo_process.stdout:
+        r = handle_clippy_msg(config, l, log, lintargs["root"], files)
+        if r is not None:
+            results.append(r)
+    march_cargo_process.wait()
+
+    if fix:
+        log.error("Rust linting in mach does not support --fix")
+
+    return results