update_index

#! /bin/sh
# update_index (Bourne shell script) -- adds line(s) for downloads to the appropriate index.txt
# Usage: update_index [ -s | <filename> <url> ] <description>
# Where
#     -s        accept "filename = url" on stdin instead of on the command line

self=`basename $0`
allowed_options=s

# create_entry() takes a filename, a URL and a description as arguments
function create_entry
{
  if [ "$3" ] ; then
    echo "$1 <$2>	$3"
  else
    echo "$1 <$2>"
  fi
}


# == command-line handling ==
# process options
set -e
eval set -- `getopt --shell=sh -n $self --options=+$allowed_options "$@"`
set +e        # getopt would have already reported the error

while [ x"$1" != x-- ] ; do
  case "$1" in
    -s) use_stdin=true ;;
  esac
  shift       # get rid of the option (or its arg if the inner shift already got rid it)
done
shift       # get rid of the "--"

# process remaining args
if [ $use_stdin ] ; then
  # accept "filename = url" on stdin
  read l
  # extract the text from before and after the " = ", respectively
  filename=${l% =*}
  url=${l#*= }
else
  filename="$1"
  url="$2"
  shift
  shift
fi
desc="$*" 

# == processing ==
# only the non-directory part of the filename is saved in the index
basename=${filename##*/}

# figure out which index.txt to append to and do so
index=${filename%/*}/index.txt
create_entry "$basename" "$url" "$desc" >> $index