Expand tabs to spaces in all found files

expand_tabs.sh

#! /bin/bash

COLOR_NC='\033[0m' # No Color
COLOR_LIGHT_GREEN='\033[1;32m'

usage() { 
  echo "$0 <files glob>
  expand tabs to spaces in given files, printing names of files that would change.
  " && \
  grep " .)\ #" $0; exit 0; 
}

SPACES=2
while getopts ":hrt:" arg; do
  case $arg in
    t) # Number of spaces to replace each tab with
      SPACES=${OPTARG}
      ;;
    r) # Expand tabs in-place, actually replacing files.
      REPLACE=true
      ;;
    h | *) # Display help.
      usage
      exit 0
      ;;
  esac
done

shift $(($OPTIND - 1))

FILES=$1;
[[ -z "$FILES" ]] && usage && exit -1;

FOUND_FILES=$(find . -name $FILES -not -path '*/\.*')

WORK_DIR=`mktemp -d`

# deletes the temp directory
function cleanup {      
  rm -rf "$WORK_DIR"
}

# register the cleanup function to be called on the EXIT signal
trap cleanup EXIT

NUM_LINES=0
while read -r line; do
  if [[ -z "$line" ]]; then
    continue
  fi

  echo "line: $line"
  mkdir -p `dirname $WORK_DIR/$line`
  expand -t 2 $line > $WORK_DIR/$line
  HAS_DIFF=`diff -q $line $WORK_DIR/$line`
  if [[ ! -z "$HAS_DIFF" ]]; then
    if [[ $REPLACE ]]; then
      mv $WORK_DIR/$line $line
      echo -e "$line ${COLOR_LIGHT_GREEN}overwritten${COLOR_NC}"
    else
      echo $line
      NUM_LINES=$((NUM_LINES+1))
    fi
  fi
done <<< "$FOUND_FILES"

exit $NUM_LINES