*: add indent control files

Signed-off-by: David Lamparter <equinox@opensourcerouting.org>

.clang-format

@@ -0,0 +1,25 @@
+---
+BasedOnStyle: LLVM
+Language: Cpp
+IndentWidth: 8
+UseTab: Always
+BreakBeforeBraces: Linux
+AlwaysBreakBeforeMultilineStrings: true
+AllowShortIfStatementsOnASingleLine: false
+AllowShortLoopsOnASingleLine: false
+AllowShortFunctionsOnASingleLine: false
+IndentCaseLabels: false
+AlignEscapedNewlinesLeft: false
+AlignTrailingComments: true
+AllowAllParametersOfDeclarationOnNextLine: false
+AlignAfterOpenBracket: true
+SpaceAfterCStyleCast: false
+MaxEmptyLinesToKeep: 2
+BreakBeforeBinaryOperators: NonAssignment
+BreakStringLiterals: false
+SortIncludes:    false
+IncludeCategories:
+  - Regex:           '^(<|lib)'
+    Priority:        0
+CommentPragmas: '\$(FRR|clippy)'
+ContinuationIndentWidth: 8

indent.py

@@ -0,0 +1,47 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+# 2017 by David Lamparter, placed in public domain
+
+import sys, re, subprocess, os
+
+# find all DEFUNs
+defun_re = re.compile(
+        r'^(DEF(UN(_NOSH|_HIDDEN)?|PY)\s*\(.*?)^(?=\s*\{)',
+        re.M | re.S)
+define_re = re.compile(
+        r'((^#\s*define[^\n]+[^\\]\n)+)',
+        re.M | re.S)
+# find clang-format control that we just inserted
+clean_re = re.compile(
+        r'^/\* \$FRR indent\$ \*/\s*\n\s*/\* clang-format (on|off) \*/\s*\n',
+        re.M)
+
+def wrap_file(fn):
+    with open(fn, 'r') as fd:
+        text = fd.read()
+
+        repl = r'/* $FRR indent$ */\n/* clang-format off */\n' + \
+                r'\1' + \
+                r'/* $FRR indent$ */\n/* clang-format on */\n'
+
+        # around each DEFUN, insert an indent-on/off comment
+        text = defun_re.sub(repl, text)
+        text = define_re.sub(repl, text)
+
+        ci = subprocess.Popen(['clang-format'], stdin = subprocess.PIPE, stdout = subprocess.PIPE)
+        stdout, ign = ci.communicate(text)
+        ci.wait()
+        if ci.returncode != 0:
+            raise IOError('clang-format returned %d' % (ci.returncode))
+
+        # remove the bits we inserted above
+        final = clean_re.sub('', stdout)
+
+        tmpname = fn + '.indent'
+        with open(tmpname, 'w') as ofd:
+            ofd.write(final)
+        os.rename(tmpname, fn)
+
+if __name__ == '__main__':
+    for fn in sys.argv[1:]:
+        wrap_file(fn)