#!/bin/bash

# Hook called before a commit is created. It will try to format each file which
# has been added/copy/modified/renamed up to a maximum of 5 times and if a 
# stable code formatting can be achieved, the commit operation will be allowed
# to proceed. If no stable code formatting is achieved in 5 passes, the commit
# operation will be aborted.

# Note on amended commits. Amending a commit can add/modify/remove files to/from an
# original commit. The pre-commit hook was already run against the original commit files
# when that commit was created. The pre-commit hook ran on an amended commit will only
# check those files which have actually been added/modified compared to the original commit.
# Files that were not touched by the amending operation, will not be tested again.


# set default encoding to UTF-8
export LANG=C.UTF-8
export LC_ALL=C.UTF-8

SCRIPT_DIR=`dirname $(readlink -f "$0")`

# Check code format information exists
MOD_ROOT_DIR=`git rev-parse --show-toplevel 2>/dev/null`
CONFIG_INDEX_FILE=${MOD_ROOT_DIR}/.repo_settings/code_format.txt
if [ ! -e "${CONFIG_INDEX_FILE}" ]; then
  echo "No code format version information file found for repository."
  exit 0
fi

# Get TDE root folder
REMOTE_URL=$(git config --get remote.origin.url)
if [ "$REMOTE_URL" != "${REMOTE_URL%/tde}" ]; then
  echo " --- This script can only be run on valid TDE repositories. Aborting."
  exit 1
fi

TDE_ROOT_DIR=$( cd `git rev-parse --show-toplevel 2>/dev/null` && cd .. &&
           cd `git rev-parse --show-toplevel 2>/dev/null` && pwd )
if [[ "$TDE_ROOT_DIR" != */tde ]]; then
  echo " --- Unable to find TDE root folder. Aborting."
  exit 2
fi

# Find code format version and configuration file
MOD_CFG_ENTRY=`grep "Version" "${CONFIG_INDEX_FILE}" | grep -v "^\s*#"`
if [ -z "${MOD_CFG_ENTRY}" ]; then
  echo " --- Unable to find the format version information. Aborting."
  exit 4
fi
if [ `echo "${MOD_CFG_ENTRY}" | wc -l` != 1 ]; then
  echo " --- Multiple entries found in the format configuration file. Aborting."
  exit 5
fi
MOD_CFG_VERSION=`echo "${MOD_CFG_ENTRY}" | sed "s|^\s*Version\s\+\([0-9]\+\)\s*$|\1|"`
MOD_CFG_FILE=${TDE_ROOT_DIR}/scripts/code-format/uncrustify_cfg_files/uncrustify_tde_${MOD_CFG_VERSION}.cfg
if [ ! -e "${MOD_CFG_FILE}" ]; then
  echo " --- Unable to find the specified format configuration version file. Aborting."
  exit 6
fi

echo "-----------------"
echo "Formatting code before committing"
echo "-----------------"

# Check whether files adhere to the required code format
VALID_EXTENSIONS=".h .cpp .c .h.cmake .cpp.cmake .c.cmake .hpp .hxx .hh .cxx .cc .hpp.cmake"
while read -r FILE_AND_STATUS; do
  if [[ "${FILE_AND_STATUS}" =~ ([ACMR])[[:space:]]+(.*) ]]; then
    FILE_STATUS="${BASH_REMATCH[1]}"
    FILE_NAME="${BASH_REMATCH[2]}"
    # Only check files of the proper type
    for FILE_EXT in $VALID_EXTENSIONS; do
      if [[ "${FILE_NAME}" = *${FILE_EXT} ]]; then
        echo "File: ${FILE_NAME} --- Git status: ${FILE_STATUS}"
        MOD_CFG_FILE="${MOD_CFG_FILE}" ${TDE_ROOT_DIR}/scripts/code-format/format_file ${FILE_NAME}
        if [ $? -ne 0 ]; then
          echo -e "\n--------------------------------------------------------"
          echo      " Process aborted due to failed code format verification "
          echo -e   "--------------------------------------------------------\n"
          exit 1
        fi
        echo "------"
        break
      fi
    done
  fi
done < <(git diff --name-status --cached --diff-filter=ACMR)

echo -e "\n----------------------------------------------"
echo      " All files adhere to the required code format "
echo      "----------------------------------------------"