#! /bin/bash

#Usage:
#There are 3 argument structures:
#-a <name : string> <type : string> <compress : bool> <delete: bool> <destination : string> <address : string>
#-m <name :string> <current_dir : string> <new_dir : string>
#-r <name : string> <directory : string>

#list of sources to download.
repo_list="repo_list.txt"

error() {
    echo "error: $@" 1>&2
    exit 1
}

assert_cmd() {
    command -v "$1" &>/dev/null || error "command $1 does not exist"
}

verify_add() {
    printf "%s\n" "$@" "" >> "${repo_list}"
}

verify_backup() {
    # ??? dude what ???

    #files.
    if [ -f "$2"+"$1"+".*" ]; then
        rm -rf "$2"+="$1"+=".*"
    fi

    #folders.
    if [ -d "$2"+"$1"+".*" ]; then
        rm -rf "$2"+"$1"
    fi
}

verify_repository() {
    case "$1" in
    git)
        assert_cmd git
        git ls-remote --exit-code --heads "$2" master || return
        ;;
    svn)
        assert_cmd svn
        # ...
        ;;
    *)
        error "invalid repository type $1"
        ;;
    esac
}

# etc ...

while getopts amr opt; do
    case "${opt}" in
    a)
        (( $# < 7 )) && error "missing command line arguments"

        # these commands don't fail
        verify_add "$1" "$3" "$6" "$7"
        verify_backup "$2" "$6"

        # this one might
        verify_repository "$3" "$7" || error "cannot verify repository"

        # ...
        ;;
    [mr])
        error "not yet implemented"
        ;;
    *)
        error "unknown option"
        ;;
    esac
done