test: Add a whitespace check to the travis build

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>

1 files changed, 59 insertions, 0 deletions

diff --git a/scripts/check_whitespace.py b/scripts/check_whitespace.py
new file mode 100755
index 00000000..6f32c24f
--- /dev/null
+++ b/scripts/check_whitespace.py
@@ -0,0 +1,59 @@
+#!/usr/bin/env python2
+# Check files for whitespace problems
+#
+# Copyright (C) 2018  Kevin O'Connor <kevin@koconnor.net>
+#
+# This file may be distributed under the terms of the GNU GPLv3 license.
+import sys, os.path
+
+HaveError = False
+
+def report_error(filename, lineno, msg):
+    global HaveError
+    HaveError = True
+    sys.stderr.write("Whitespace error in file %s on line %d: %s\n" % (
+        filename, lineno + 1, msg))
+
+def check_file(filename):
+    # Open and read file
+    try:
+        f = open(filename, 'rb')
+        data = f.read()
+        f.close()
+    except IOError:
+        return
+    if not data:
+        # Empty files are okay
+        return
+    # Do checks
+    lineno = 0
+    for lineno, line in enumerate(data.split('\n')):
+        # Check for control characters
+        for c in line:
+            oc = ord(c)
+            if oc < 32:
+                char_name = repr(c)
+                if oc == 9:
+                    if os.path.basename(filename).lower() == 'makefile':
+                        continue
+                    char_name = 'tab'
+                report_error(filename, lineno, "Invalid %s character" % (
+                    char_name,))
+                break
+        # Check for trailing space
+        if line.endswith(' '):
+            report_error(filename, lineno, "Trailing space")
+    if not data.endswith('\n'):
+        report_error(filename, lineno, "No newline at end of file")
+    if data.endswith('\n\n'):
+        report_error(filename, lineno, "Extra newlines at end of file")
+
+def main():
+    files = sys.argv[1:]
+    for filename in files:
+        check_file(filename)
+    if HaveError:
+        sys.exit(-1)
+
+if __name__ == '__main__':
+    main()