#!/bin/bash
#
# Syntax:  grepem [-h] [-v] [-w] [-u] regexp [file [...]]
#
# Purpose: Performs a grep on the given files and opens those that match
#          the given regular expression regexp.
#          If only one input argument is specified, the grep is performed
#          on all files in the current directory.
#          If the option -w is specified, grepem searches for  string  as a
#          word.
#          By default grepem does a case-insensitive grep. However, if the
#          option -u is specified, grepem distinguishes between upper
#          and lower case letters.
#          By default emacs is used to open the files, unless the -v flag
#          is present; in that case vi is used.

# Created: Jul 31, 2007       by Bart De Schutter
# Last revised: Aug  6, 2007  by Bart De Schutter
#
# See http://www.deschutter.info/util/scripts.html for the latest version of
# this script.

# Status: public
# Category: files

#
# Process input arguments.
#

editor="emacs"
case_string="-i"
word_string=""
while getopts :hvwu option
do
   case "$option" in
      h) sed '/^$/q;/^#!/d;s/^# //;s/^#//' $0 >&2
         exit 1
         ;;
      v) editor="vi";;
      w) word_string="-w";;
      u) case_string="";;
      \?) echo >&2
         echo >&2 "Unknown option: $OPTARG"
         echo >&2
         sed '/^$/q;/^#!/d;s/^# //;s/^#//' $0 >&2
         exit 1
         ;;
   esac
done
shift $(($OPTIND-1))

if [ $# -eq 0 ];
then
   echo >&2
   echo >&2 "ERROR: ${0##*/} requires at least 1 input argument."
   echo >&2
   sed '/^$/q;/^#!/d;s/^# //;s/^#//' $0 >&2
   exit 1
fi

#
# Perform grep and open files that match the given regexp.
#
if [ $# -eq 1 ];
then
   lst=$(grep -l $case_string $word_string "$1" *)
else
   lst=$(grep -l $case_string $word_string "$@")
fi
if [ ! -z "$lst" ]
then
   # Do some processing in order to be able to deal with files that
   # contain a space or a # in their name.
   lst=$(echo "$lst" | sed -e 's/ /\\ /g;s/#/\\#/g' | tr "\n" " " )
   eval $editor $lst
else
   echo "No files found that match the given regular expression."
fi