#!/bin/sh

#
# Remove the trailing whitespaces and tabs from file
#
# Usage ./remove_trailing_whitespaces <file> <file> ....
#
# Any modified file is renamed to file~~
# Any file that has suffix ~ in the input list is skipped
#

tmpfile=/tmp/xxx.$$

#
# If we have GNU sed, we can use 's/[ \t]+$//'.
# But on freeBSD and Darwin, \t does not match tab so
# this doesn't work. We use [[:blank:]] instead.
#
for file in $* ; do
  if test -f $file ; then 
    case $file in 
     *~)
       echo "Skipping $file"
       ;;
     *) 
       sed -e 's/[[:blank:]]*$//' "${file}" > $tmpfile
       diff -q $tmpfile $file > /dev/null
       if test $? -ne 0 ; then
         echo "Removed spaces in $file"
         mv $file $file~~
         cp $tmpfile $file
       fi
       rm $tmpfile
       ;;
    esac
  else
    if test -e $file ; then
      echo "Skipping $file"
    else
      echo "Warning: $file not found"
    fi
  fi
done