#!/bin/bash
## Run mplayer on given file or URL using youtube-dl to decipher youtube URLs.
## Usage: mp [-low] [-help] [-mplayer-help] [options] [url|path/]filename
##   [options]      are identical to mplayer except others listed here
##   -help          show this help screen
##   -low           use the lower bitrate youtube feed
##   -mplayer-help  same as "mplayer --help"
## mp 0.2 (c) 2008 Adam Katz <scriptsATkhopiscom>, free under GPL v2+

if type youtube-dl >/dev/null 2>&1; then
  YOUTUBE=true
  BEST_QUALITY='-b'
fi

while [ -n "$1" ]; do
  i=$((${i:-0}+1)) # array index, equiv to c-style for(i=1; "$1"; i++) { }
  if [[ "$1" =~ "^-+low$" ]] # reminder:  regex matching is bash-only
    then unset BEST_QUALITY
  elif [ "$1" = "-h" ] || [[ "$1" =~ "^-+help" ]]
    then sed -e '/^## /!d' -e 's///' "`which $0 || echo $0`"; exit 0
  elif [[ "$1" =~ "^-+mplayer" ]]
    then mplayer --help; exit $?
  elif [[ "$1" =~ "^[fh]t?tp://.*youtube\.com/.." ]]
    then if [ -n "$YOUTUBE" ]
      then ARGS[$i]=$(youtube-dl -g $BEST_QUALITY "$1")
      else echo "${0##*/}: Trying to play youtube video without youtube-dl" >&2
           ARGS[$i]="$1"
    fi
  fi
  shift
done

exec mplayer "${ARGS[@]}"  # we use arrays to preserve spacing.  requires bash.