1 files changed, 72 insertions, 0 deletions
diff --git a/Biz/lint.py b/Biz/lint.py
new file mode 100755
index 0000000..d12431c
--- /dev/null
+++ b/Biz/lint.py
@@ -0,0 +1,72 @@
+#!/usr/bin/env python
+"""
+all your lint are belong to us
+"""
+import os
+import subprocess
+import sys
+
+
+def run(cmd, file):
+    "Exec a linter for a file."
+    global ERRORS  # pylint: disable=global-statement
+    args = {
+        "ormolu": ["--mode", "check"],
+        "hlint": [],
+        "black": ["--quiet", "--check"],
+        "pylint": [],
+    }
+    # pylint: disable=subprocess-run-check
+    ret = subprocess.run([cmd, *args[cmd], file], stdout=subprocess.PIPE)
+    if ret.returncode != 0:
+        ERRORS += 1  # pylint: disable=undefined-variable
+        msg = ret.stdout.decode("utf-8").strip()
+        print(f"lint error: {cmd} on {file}")
+        if msg:
+            print(msg)
+
+
+def changed_files():
+    "Return a list of changed files according to git."
+    return (
+        subprocess.check_output(["git", "diff", "--cached", "--name-only"])
+        .decode("utf-8")
+        .strip()
+    )
+
+
+def group_files(files, extensions):
+    """Given a list of files and list of extensions, return a dict of:
+       {ext: [files]}
+
+    """
+    root = os.getenv("BIZ_ROOT")
+    ret = {k: [] for k in extensions}
+    for ext in extensions:
+        for file in files:
+            if file.endswith(ext):
+                ret[ext].append(os.path.join(root, file))
+    return ret
+
+
+if __name__ == "__main__":
+    ERRORS = 0
+    if "-h" in sys.argv:
+        print(f"usage: {os.path.basename(__file__)} <files...>")
+        print("if no files given, lint files staged in git")
+        sys.exit(0)
+    elif len(sys.argv) == 1:
+        FILES = group_files(changed_files(), [".hs", ".py"])
+    else:
+        FILES = group_files(sys.argv[1:], [".hs", ".py"])
+    for hs in FILES[".hs"]:
+        print(f"lint: {hs}")
+        run("ormolu", hs)
+        run("hlint", hs)
+    for py in FILES[".py"]:
+        print(f"lint: {py}")
+        run("black", py)
+        run("pylint", py)
+    run("black", __file__)
+    run("pylint", __file__)
+    sys.exit(ERRORS)