#!/bin/sh
set -eu

if [ $# != 2 ]; then
  echo >&2 E: Need exactly two arguments.
  return 1
fi

TSK="$1"
LINK="$2"

case "$LINK" in
  (*@*|"<*>")
    LINK="${LINK%>}"; LINK="${LINK#<}"
    echo >&2 I: "Adding MsgID <$LINK> to task $TSK"
    task "$TSK" mod data:msgid:"$LINK"
    ;;

  (*://*)
    echo >&2 I: "Adding URL $LINK to task $TSK"
    task "$TSK" mod data:url:"$LINK"
    ;;

  (*)
    if [ -f "$LINK" ]; then

      LINK="$(readlink -e "$LINK")"

      case "$LINK" in
        ($HOME/*) LINK="~${LINK#$HOME}";;
      esac
      echo >&2 I: "Adding file $LINK to task $TSK"
      task "$TSK" mod data:file:"$LINK"

    else
      echo >&2 E: "Don't know how to handle link data $LINK"
      return 1

    fi
    ;;
esac