add config for YCM completion engine

.gitignore

@@ -9,6 +9,7 @@
 *.orig
 *.lo
 *.rej
+*.pyc
 .libs/
 .deps/
 .dirstamp

.ycm_extra_conf.py

+#!/usr/bin/python -Es
+# vim: et:ts=4:sw=4:colorcolumn=100
+#
+# Configuration for You Complete Me (YCM) code-completion engine for Vim.
+#
+# This file is released into the public domain.
+#
+
+import sys
+import os
+
+DIR = os.path.dirname(__file__)
+
+FLAGS = [
+    '-std=gnu99',
+    '-Wall', '-Wno-unused', '-Werror=implicit',
+    '-DCONFIG_DIR=', '-DRUN_DIR=', '-DSTORAGE_DIR=',
+]
+
+CONFIG_H = 'src/config.h'
+
+INCLUDES = [
+    ('src', []),
+    ('tests', ['src', 'libtap']),
+]
+
+def relative_path(filename):
+    return os.path.relpath(filename, DIR)
+
+def absolute_path(filename):
+    return os.path.normpath(os.path.join(DIR, filename))
+
+def includes_for(filename):
+    relative = relative_path(filename)
+    for prefix, includes in INCLUDES:
+        if relative.startswith(prefix + '/'):
+            return [prefix] + includes
+    return []
+
+def include_flag(path):
+    return "-I%s" % absolute_path(path)
+
+def FlagsForFile(filename):
+    # input filename is an absolute path
+    config = ["-include", absolute_path(CONFIG_H)]
+    includes = [include_flag(f) for f in includes_for(filename)]
+    return {'flags': FLAGS + config + includes, 'do_cache': True}
+
+if __name__ == '__main__':
+    print >>sys.stderr, "Not runnable."
+    sys.exit(1)