#!/usr/bin/env bash
# The MIT License (MIT)
# 
# Copyright (c) 2011-2015 Ismaël Bouya http://www.normalesup.org/~bouya/
# 
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
# 
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
# 
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.

# cmdtemp
#   List commands
# cmdtemp <n>
#   Execute command number <n>
# cmdtemp <-n>
#   Delete command number <n>
# cmdtemp <...>
#   Save command


function is_negative() {
    s=$(echo $1 | tr -d 0-9)
    if [ "$s" == "-" ]; then
        return 0
    else
        return 1
    fi
}

function is_integer() {
    s=$(echo $1 | tr -d 0-9)
    if [ -z "$s" ]; then
        return 0
    else
        return 1
    fi
}

if [ $# -eq 0 ]; then
   cat -n $HOME/.cmdtemp
   exit
fi

if is_integer "$1"; then
   ligne="$1"
   shift
   commande=`awk "FNR == $ligne" $HOME/.cmdtemp`
   echo "*** "$commande
   eval $commande
elif is_negative "$1"; then
    s=$(echo $1 | tr -d '-')
    sed -i -e $s"d" $HOME/.cmdtemp
else
    echo "$*" >> $HOME/.cmdtemp
fi