grep-shortcuts

#!/bin/bash

me="grep-shortcuts"
mode=`basename $0`

if [ "$mode" = "$me" ] && [ -z "$*" ]; then
  here=`dirname $0`
  if [ -z "$ZDOTDIR" ]; then
    echo "\$ZDOTDIR not set; aborting." >&2
    exit 1
  fi

  echo -n "Setting up handy grep shortcuts in $here ..."
  cd "$here"
  # see also global aliases in .zshrc
  for switches in '' {,i}{,l,L}{,r,R}{,v}{,C}; do
    cmd=g$switches
    preexisting=$( which $cmd 2>/dev/null )
    if [ $? = 0 ] && [ "$ZDOTDIR/bin/$cmd" != "$preexisting" ]; then
        echo -ne "\nWARNING! $cmd already found on path" >&2
    fi
    if ! [ -e $cmd ]; then
        ln -s $me $cmd
        echo -n " $cmd"
    fi
  done
  echo
  exit 0
fi

switches="${mode#g}"
color=
case "$switches" in
    *C*)
        switches="${switches//C/}"
        color=--color=always
        ;;
esac

[ -n "$switches" ] && switches=-$switches

exec grep -E $switches $color "$@"