#!/usr/bin/env bash
#
# Script to compare the scaladoc of the current commit with the scaladoc
# of the parent commit. No arguments.
#


oldsha=$(git log -1 --format="%H" HEAD^)
oldsha=${oldsha#g}
oldsha=${oldsha:0:10}

sha=`sh tools/get-scala-commit-sha`
echo "parent commit sha: $oldsha. current commit sha: $sha"

# create scaladoc for parent commit if not done already
if [ ! -f "build/scaladoc-output-$oldsha.txt" ]
then
  echo "making scaladoc for parent commit ($oldsha)"
  git checkout HEAD^
  ant docs.lib -Dscaladoc.raw.output='yes' > build/scaladoc-output-$oldsha.txt
  cp -r build/scaladoc/ build/scaladoc-${oldsha}
  git checkout $sha
fi

# create scaladoc for current commit
echo "making scaladoc for current commit ($sha)"
ant docs.lib -Dscaladoc.raw.output='yes' > build/scaladoc-output-$sha.txt
cp -r build/scaladoc/ build/scaladoc-${sha}
echo "opendiff build/scaladoc-output-$oldsha.txt build/scaladoc-output-$sha.txt"
opendiff build/scaladoc-output-$oldsha.txt build/scaladoc-output-$sha.txt

echo "Comparing files..."

difffile=build/scaladoc-diff-${sha}-$oldsha.txt
sh tools/scaladoc-compare build/scaladoc-${sha}/ build/scaladoc-$oldsha/ &> $difffile
open $difffile &

# Adapted from tools/scaladoc-compare
echo "Comparing versions with difftool: build/scaladoc-${sha}/ build/scaladoc-$oldsha/"
NEW_PATH=build/scaladoc-${sha}/
OLD_PATH=build/scaladoc-$oldsha/

FILES=`find $NEW_PATH -name '*.html.raw'`
if [ "$FILES" == "" ]
then
  echo "No .html.raw files found in $NEW_PATH!"
  exit 1
fi

for NEW_FILE in $FILES
do
  OLD_FILE=${NEW_FILE/$NEW_PATH/$OLD_PATH}
  if [ -f $OLD_FILE ]
  then
    DIFF=`diff -q -w $NEW_FILE $OLD_FILE 2>&1`
    if [ "$DIFF" != "" ]
    then
      opendiff $OLD_FILE $NEW_FILE > /dev/null
      echo "next [y\N]? "
      read -n 1 -s input

      if [ "$input" == "N" ]
      then exit 0
      fi
    fi
  else
    echo -e "$NEW_FILE: No corresponding file (expecting $OLD_FILE)\n\n"
  fi
done

echo "Done."