#!/bin/bash
#
# This script makes a patch for LLVM ensuring the correct diff options and
# putting the files in a standard review order.


function error {
  retcode="$?"
  echo "mkpatch: error: $1 ($retcode)"
  exit 1
}

if [ ! -e llvm.spec.in ] ; then
  error "Please change directory to the LLVM top source directory"
fi
if [ "$#" -ne 1 ] ; then
  error "usage: utils/mkpatch [PATCH_NAME]"
fi
NAME="$1"
echo "mkpatch: Generating differences on top level files"
cvs diff -l -Ntdup -5 . > "$NAME".patch.raw 2>&1
echo "mkpatch: Generating differences on all directories"
cvs diff -Ntdup -5 >> "$NAME".patch.raw 2>&1 \
  autoconf docs utils include lib/System lib/Support lib/VMCore lib/AsmParser \
  lib/Bytecode lib/Analysis lib/Transforms lib/CodeGen lib/Target \
  lib/ExecutionEngine lib/Debugger lib/Linker \
  tools test runtime projects examples win32 Xcode

echo "mkpatch: Removing cruft from the patch file"
sed -e '/^[?] .*/d' -e '/^cvs diff: Diffing/d' "$NAME".patch.raw | awk '\
BEGIN { deleting = 0; } \
/^Index: .*[.]cvs$/ { deleting = 1; fname=substr($0,7); \
  print "Skipping: ", fname > "/dev/stderr"; } \
/^Index:.*/ && !/^Index: .*[.]cvs$/ { deleting = 0; } \
{ if (! deleting) { print; } } '  > "$NAME".patch  || \
  error "sed/awk cleanup failed"