repurpose_package.sh

#!/usr/bin/env bash

if [ $# -le 1 ] || [ $1 == "--help" ]; then
  echo "usage: ./repurpose_package.sh <original_package_name> <new_package_name> [--dry-run, --camel-case]
  Removes the .git directory, initializes a new one,
  replaces all occurences of the original package name with the new one in all files withing all subfolders,
  replaces all occurences of the original package name with the new one wthinin all filenames."
  exit 1
fi

ORIG_NAME=$1
NEW_NAME=$2
DRY_RUN=0
CAMEL_CASE=0

if [ "$3" == "--dry-run" ] || [ "$4" == "--dry-run" ]; then
  echo "Dry run mode on - nothing will be changed."
  DRY_RUN=1
fi

if [ "$3" == "--camel-case" ] || [ "$4" == "--camel-case" ]; then
  echo "CamelCase occurences will also be replaced."
  CAMEL_CASE=1
fi

# #{ init_new_repo ()

init_new_repo ()
{
  local DRY_RUN=$1

  # Remove .git and initialize a new repository

  echo "** CREATING NEW GIT REPOSITORY **"

  # Ask for confirmation
  echo History of the old repository will be deleted.
  read -p "Are you sure? (y/n) " -r

  if [[ $REPLY =~ ^[Yy]$ ]]
  then

    if [ "$DRY_RUN" -eq 0 ]; then
      rm -rf .git
      git init
    fi
    echo Created a new git repository.

  else

    echo Not creating a new git repository.

  fi
}

# #}

# #{ replace_within_files ()

replace_within_files ()
{
  local ORIG_NAME=$1
  local NEW_NAME=$2
  local DRY_RUN=$3

  # Replace occurences within files
  readarray -d '' within_files < <(grep -rl "$ORIG_NAME" --null)

  echo "** REPLACING OCCURENCES WITHIN FILES **"

  if [[ -z "${within_files[@]}" ]]; then

    echo "No matches found for \"$ORIG_NAME\" within files!"

  else

    # Ask for confirmation
    echo These files will be modified:
    for file in "${within_files[@]}"
    do
      echo " - $file"
    done
    read -p "Are you sure? (y/n) " -r

    if [[ $REPLY =~ ^[Yy]$ ]]
    then

      for file in "${within_files[@]}"
      do
        echo " - Replacing \"$1\" with \"$2\" in file \"$file\"."
        if [ "$DRY_RUN" -eq 0 ]; then
          sed -i "s/$ORIG_NAME/$NEW_NAME/g" "$file"
        fi
      done

      echo "Replaced all occurences within files."

    else

      echo "Not replacing occurences within files."

    fi

  fi
}

# #}

# #{ replace_within_filenames ()

replace_within_filenames ()
{
  local ORIG_NAME=$1
  local NEW_NAME=$2
  local DRY_RUN=$3

  # Replace occurences in file names
  readarray -d '' files < <(find -name "*$ORIG_NAME*" -print0)

  echo "** REPLACING OCCURENCES WITHIN FILE NAMES **"

  if [[ -z "${files[@]}" ]]; then

    echo "No matches found for \"$ORIG_NAME\" in file names!"

  else

    # Ask for confirmation
    echo These files will be modified:
    for file in "${files[@]}"
    do
      echo " - $file"
    done
    read -p "Are you sure? (y/n) " -r

    if [[ $REPLY =~ ^[Yy]$ ]]
    then

      for file in "${files[@]}"
      do
        new_file=${file//$ORIG_NAME/$NEW_NAME}
        echo " - Renaming file \"$file\" to \"$new_file\"."
        if [ "$DRY_RUN" -eq 0 ]; then
          mv "$file" "$new_file"
        fi
      done

      echo "Replaced all occurences within file name."

    else

      echo "Not replacing occurences within file name."

    fi

  fi
}

# #}

init_new_repo $DRY_RUN
replace_within_files $ORIG_NAME $NEW_NAME $DRY_RUN
replace_within_filenames $ORIG_NAME $NEW_NAME $DRY_RUN

if [ "$CAMEL_CASE" -eq 1 ]; then

  ORIG_NAME_CC=`echo "$ORIG_NAME" | sed -r 's/(^|_)([a-z])/\U\2/g'`
  NEW_NAME_CC=`echo "$NEW_NAME" | sed -r 's/(^|_)([a-z])/\U\2/g'`

  replace_within_files $ORIG_NAME_CC $NEW_NAME_CC $DRY_RUN
  replace_within_filenames $ORIG_NAME_CC $NEW_NAME_CC $DRY_RUN

fi

if [ "$DRY_RUN" -eq 1 ]; then
  echo "Dry run mode on - nothing was changed."
fi