#!/usr/bin/env bash
###########################################################################
#    prepare-commit.sh
#    ---------------------
#    Date                 : August 2008
#    Copyright            : (C) 2008 by Juergen E. Fischer
#    Email                : jef at norbit dot de
###########################################################################
#                                                                         #
#   This program is free software; you can redistribute it and/or modify  #
#   it under the terms of the GNU General Public License as published by  #
#   the Free Software Foundation; either version 2 of the License, or     #
#   (at your option) any later version.                                   #
#                                                                         #
###########################################################################

TOPLEVEL=$(git rev-parse --show-toplevel)

PATH=$TOPLEVEL/scripts:$PATH:$PWD/scripts

if ! tty -s && [[ "$0" =~ /pre-commit ]]; then
    exec </dev/tty
fi

cd "$TOPLEVEL"

# GNU prefix command for mac os support (gsed, gsplit)
GP=
if [[ "$OSTYPE" =~ darwin* ]]; then
  GP=g
fi

if ! type -p astyle.sh >/dev/null; then
  echo astyle.sh not found
  exit 1
fi

if ! type -p colordiff >/dev/null; then
  colordiff()
  {
    cat "$@"
  }
fi

if [ "$1" = "-c" ]; then
  echo "Cleaning..."
  remove_temporary_files.sh
fi

set -e

# determine changed files
MODIFIED=$(git status --porcelain| ${GP}sed -ne "s/^ *[MA]  *//p" | sort -u)

if [ -z "$MODIFIED" ]; then
  echo nothing was modified
  exit 0
fi

if [[ -n "$QGIS_CHECK_SPELLING" && -x "${TOPLEVEL}"/scripts/spell_check/check_spelling.sh ]]; then "${TOPLEVEL}"/scripts/spell_check/check_spelling.sh "$MODIFIED"; fi

FILES_CHANGED=0

# save original changes
REV=$(git log -n1 --pretty=%H)
#git diff >sha-"$REV".diff

ASTYLEDIFF=astyle.$REV.diff
true > "$ASTYLEDIFF"

# reformat
i=0
N=$(echo "$MODIFIED" | wc -w)
for f in $MODIFIED; do
  (( i++ )) || true

  case "$f" in
  *.cpp|*.c|*.h|*.cxx|*.hxx|*.c++|*.h++|*.cc|*.hh|*.C|*.H|*.py|*.mm)
    ;;

  *)
    continue
    ;;
  esac

  m=$f.$REV.prepare

  cp "$f" "$m"
  ASTYLEPROGRESS=" [$i/$N]" astyle.sh "$f"
  if diff -u "$m" "$f" >>"$ASTYLEDIFF"; then
    # no difference found
    rm "$m"
  fi
done

if [ -s "$ASTYLEDIFF" ]; then
  if tty -s; then
    # review astyle changes
    colordiff <"$ASTYLEDIFF" | less -r
    rm "$ASTYLEDIFF"
  else
    echo "Files changed (see $ASTYLEDIFF)"
  fi
  FILES_CHANGED=1
else
  rm "$ASTYLEDIFF"
fi

exit $FILES_CHANGED

# vim: set ts=2 expandtab :
