Creating script to check formatting; for now just prints diffs

verify_formatting.py

+#!/usr/bin/env python3
+
+from __future__ import print_function
+
+import sys
+import os
+import subprocess
+
+
+def hindent(contents):
+    return subprocess.check_output(["hindent", "--style", "gibiansky"],
+                                   input=bytes(contents, 'utf-8'))
+
+
+def diff(src1, src2):
+
+    with open(".tmp1", "w") as f1:
+        f1.write(src1)
+
+    with open(".tmp2", "w") as f2:
+        f2.write(src2)
+
+    return subprocess.check_output(["diff", ".tmp1", ".tmp2"])
+
+# Verify that we're in the right directory
+try:
+    open("ihaskell.cabal", "r").close()
+except:
+    print(sys.argv[0], "must be run from the ihaskell directory",
+          file=sys.stderr)
+
+# Find all the source files
+sources = []
+for root, dirnames, filenames in os.walk("src"):
+    for filename in filenames:
+        if filename.endswith(".hs"):
+            sources.append(os.path.join(root, filename))
+
+
+hindent_outputs = {}
+for source_file in sources:
+    print("Formatting file", source_file)
+    with open(source_file, "r") as f:
+        original_source = f.read()
+    formatted_source = hindent(original_source)
+
+    hindent_outputs[source_file] = (original_source, formatted_source)
+
+diffs = {filename: diff(original, formatted)
+         for (filename, (original, formatted)) in hindent_outputs.values()}
+
+for filename, diff in diffs.items():
+    print(filename)
+    print('=' * 10)
+    print(diff)