#!/bin/bash

function rename_directories {
  find . -type d -not -path '*/\.git/*' -execdir rename "$SEARCH" "$REPLACE" {} \; > /dev/null 2>&1
}

function rename_files {
  find . -name '*' -type f -not -path '*/\.git/*' -exec rename "$SEARCH" "$REPLACE" {} \;
}

function rename_inline {
  find . -name '*' -type f -not -path '*/\.git/*' -exec sed -i "s/${SEARCH}/${REPLACE}/g" {} \;
}

# das erste Argument der Funktion ist die Anzahl der Argumente des aufrufenden Scripts
# das zweite Argument ist die erwünschte Anzahl an Argumenten
function check_argument_count {
  if [ "$1" -lt "$2" ] ; then
    echo ">>> Not enough arguments..."
    exit 1
  elif [ "$1" -gt "$2" ] ; then
    echo ">>> Too many arguments..."
    exit 2
  fi
}

function print_help {
cat <<EOF

Description:
Search and replace recursively.

Usage:
sr [-h|-d|-i|-f] <search> <replace>

Options:
-d      Rename only directories.
-f      Rename only files.
-i      Rename only in files.
-h      Print this help.

Author:
michael.grote@posteo.de - git.mgrote.net
EOF
}

SEARCH="$2"
REPLACE="$3"

case "$1" in
  -f)
    check_argument_count "$#" "3"
    rename_files
    ;;
  -i)
    check_argument_count "$#" "3"
    rename_inline
    ;;
  -d)
    check_argument_count "$#" "3"
    rename_directories > /dev/null 2>&1
    ;;
  -h)
    print_help
    exit 0
    ;;
  # ohne Parameter wird alles gemacht
  *)
    check_argument_count "$#" "2"
    SEARCH=$1
    REPLACE=$2
    echo ">>> Rename files..."
    rename_files
    echo ">>> Rename directories..."
    rename_directories > /dev/null 2>&1
    echo ">>> Rename inline..."
    rename_inline
   ;;
esac