trfn

#!/bin/ksh
### Author: Michael Grubb <devel@dailyvoid.com>
### File: Source/Projects/Acxiom/Scripts/file/trfn
### Created: 2012-06-12 11:30
### License: Creative Commons
### Description: Transliterate Filenames

function usage {
  cat >&2 <<! 
Usage: trfn [-t] [-h] [fc tc] file1..filen
  -t Dry Run.  Prints out what new file names will be but does not rename them.
  -h This help.
  fc is the character or char class (as used by tr) to change
  tc is the character list to change to (as used by tr)
!
  exit 1
}

function check_arg_num {
  [ "$1" -gt 0 ] || usage
}

check_arg_num $#
#[ "$#" -gt 0 ] || usage

FC=' '
TC='_'

if [ "$1" = "-t" ]
then
  DRY_RUN=y
  check_arg_num $(($# - 1))
  shift
elif [ "$1" = "-h" -o "$1" = "--help" ]
then
  usage
fi

# if first arg is not a file then assume that the next two arguments
# are fc and tc
if [ ! -e "$1" ]
then
  FC="$1"
  TC="$2"
  shift; shift
fi

for f in "$@"
do
  ext=${f##*.}
  bf=${f%.*}
  bf=${bf##*/}
  dir=${f%/*}
  [ "$dir" = "$f" ] && dir=.

  tf="${dir}/$(echo $bf | tr "$FC" "$TC").${ext}"
  # get inode numbers to skip files that are the same
  fin=$(ls -i $f 2>/dev/null)
  tfin=$(ls -i $tf 2>/dev/null)

  if [ -n "$DRY_RUN" ]
  then
    print "In File: '$f'"
    print "Out File: '${tf}'"
    print
  elif [ ! "$fin" = "$tfin" ]
  then
    mv -i "$f" "$tf"
  fi
done

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