#!/bin/bash
## Copyright (c) 2016, Alliance for Open Media. All rights reserved
##
## This source code is subject to the terms of the BSD 2 Clause License and
## the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
## was not distributed with this source code in the LICENSE file, you can
## obtain it at www.aomedia.org/license/software. If the Alliance for Open
## Media Patent License 1.0 was not distributed with this source code in the
## PATENTS file, you can obtain it at www.aomedia.org/license/patent.
##

if [ "$(uname -o 2>/dev/null)" = "Cygwin" ] \
   && cygpath --help >/dev/null 2>&1; then
    FIXPATH='cygpath -m'
else
    FIXPATH='echo_path'
fi

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

die_unknown(){
    echo "Unknown option \"$1\"." >&2
    echo "See ${self_basename} --help for available options." >&2
    exit 1
}

echo_path() {
    for path; do
        echo "$path"
    done
}

# Output one, possibly changed based on the system, path per line.
fix_path() {
    $FIXPATH "$@"
}

# Corrects the paths in file_list in one pass for efficiency.
# $1 is the name of the array to be modified.
fix_file_list() {
    declare -n array_ref=$1
    files=$(fix_path "${array_ref[@]}")
    local IFS=$'\n'
    array_ref=($files)
}

generate_uuid() {
    local hex="0123456789ABCDEF"
    local i
    local uuid=""
    local j
    #93995380-89BD-4b04-88EB-625FBE52EBFB
    for ((i=0; i<32; i++)); do
        (( j = $RANDOM % 16 ))
        uuid="${uuid}${hex:$j:1}"
    done
    echo "${uuid:0:8}-${uuid:8:4}-${uuid:12:4}-${uuid:16:4}-${uuid:20:12}"
}

indent1="    "
indent=""
indent_push() {
    indent="${indent}${indent1}"
}
indent_pop() {
    indent="${indent%${indent1}}"
}

tag_attributes() {
    for opt in "$@"; do
        optval="${opt#*=}"
        [ -n "${optval}" ] ||
            die "Missing attribute value in '$opt' while generating $tag tag"
        echo "${indent}${opt%%=*}=\"${optval}\""
    done
}

open_tag() {
    local tag=$1
    shift
    if [ $# -ne 0 ]; then
        echo "${indent}<${tag}"
        indent_push
        tag_attributes "$@"
        echo "${indent}>"
    else
        echo "${indent}<${tag}>"
        indent_push
    fi
}

close_tag() {
    local tag=$1
    indent_pop
    echo "${indent}</${tag}>"
}

tag() {
    local tag=$1
    shift
    if [ $# -ne 0 ]; then
        echo "${indent}<${tag}"
        indent_push
        tag_attributes "$@"
        indent_pop
        echo "${indent}/>"
    else
        echo "${indent}<${tag}/>"
    fi
}