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#!/bin/bash

set -e

kw_prog_name="$(basename $0)"
kw_config_dir="${XDG_CONFIG_HOME:-$HOME/.config}/intel-linux-gfx-mirror-docs"

# These vars are set in ~/.config/intel-linux-docs/config.
DOCDIR=
PREHOOK=
POSTHOOK=

function kw_print_help() {
    echo "NAME"
    echo "    $kw_prog_name"
    echo ""
    echo "SYNOPSIS"
    echo "    $kw_prog_name [-h|--help] <all|ivb|snb|ilk|g45|g35>"
    echo ""
    echo "DESCRIPTION"
    echo "    Download the Intel OpenSource HD Graphics Programmer's Reference"
    echo "    Manuals from http://intellinuxgraphics.org."
}

function kw_fatal_error() {
    echo "error: $kw_prog_name: $@"
    exit 1
}

function kw_usage_error() {
    echo "usage error: $kw_prog_name"
    echo
    kw_print_help
    exit 1
}

function kw_load_config() {
    local conf_file="$kw_config_dir/conf"
    local example_file="$conf_file.example"

    # Write out example file.
    mkdir -p "$kw_config_dir"
    cat > "$example_file" <<-EOF
		#DOCDIR="\$HOME/doc/intel-linux-gfx/prm"
		#PREHOOK=
		#POSTHOOK=
		EOF

    if [[ -r "$conf_file" ]]; then
        source "$conf_file"
    fi

    # Set defaults for config vars.
    DOCDIR="${DOCDIR:-$HOME/doc/intel-linux-gfx/prm}"
}

function kw_run_prehook() {
    if [[ "$PREHOOK" ]]; then
        cd "$kw_config_dir"
        "$PREHOOK" "$@"
    fi
}

function kw_run_posthook() {
    if [[ "$POSTHOOK" ]]; then
        cd "$kw_config_dir"
        "$POSTHOOK" "$@"
    fi
}

function kw_download_files() {
    local outdir="$DOCDIR/$1"
    shift

    local cutdirs=$(echo $1 | sed 's@[^/]@@g' | wc -c)

    for x in "$@"; do
        wget \
            "--mirror" \
            "--no-parent" \
            "--directory-prefix=$outdir" \
            "--no-host-directories" \
            "--cut-dirs=$cutdirs" \
            "http://intellinuxgraphics.org/$x"
    done
}

function kw_mirror_ivb() {
    kw_run_prehook ivb

    kw_download_files 'ivb' \
        \
        'documentation/IVB/IHD_OS_Vol1_Part1.pdf' \
        'documentation/IVB/IHD_OS_Vol1_Part2.pdf' \
        'documentation/IVB/IHD_OS_Vol1_Part3.pdf' \
        'documentation/IVB/IHD_OS_Vol1_Part4.pdf' \
        'documentation/IVB/IHD_OS_Vol1_Part5.pdf' \
        'documentation/IVB/IHD_OS_Vol1_Part6.pdf' \
        'documentation/IVB/IHD_OS_Vol1_Part7.pdf' \
        \
        'documentation/IVB/IHD_OS_Vol2_Part1.pdf' \
        'documentation/IVB/IHD_OS_Vol2_Part2.pdf' \
        'documentation/IVB/IHD_OS_Vol2_Part3.pdf' \
        \
        'documentation/IVB/IHD_OS_Vol3_Part1.pdf' \
        'documentation/IVB/IHD_OS_Vol3_Part2.pdf' \
        'documentation/IVB/IHD_OS_Vol3_Part3.pdf' \
        'documentation/IVB/IHD_OS_Vol3_Part4.pdf' \
        \
        'documentation/IVB/IHD_OS_Vol4_Part1.pdf' \
        'documentation/IVB/IHD_OS_Vol4_Part2.pdf' \
        'documentation/IVB/IHD_OS_Vol4_Part3.pdf' \

    kw_run_posthook ivb
}

function kw_mirror_snb() {
    kw_run_prehook snb

    kw_download_files 'snb' \
        \
        'documentation/SNB/IHD_OS_Vol1_Part1.pdf' \
        'documentation/SNB/IHD_OS_Vol1_Part2.pdf' \
        'documentation/SNB/IHD_OS_Vol1_Part3.pdf' \
        'documentation/SNB/IHD_OS_Vol1_Part4.pdf' \
        'documentation/SNB/IHD_OS_Vol1_Part5.pdf' \
        \
        'documentation/SNB/IHD_OS_Vol2_Part1.pdf' \
        'documentation/SNB/IHD_OS_Vol2_Part2.pdf' \
        \
        'documentation/SNB/IHD_OS_Vol3_Part1.pdf' \
        'documentation/SNB/IHD_OS_Vol3_Part2.pdf' \
        'documentation/SNB/IHD_OS_Vol3_Part3.pdf' \
        \
        'documentation/SNB/IHD_OS_Vol4_Part1.pdf' \
        'documentation/SNB/IHD_OS_Vol4_Part2.pdf' \

    kw_run_posthook snb
}

function kw_mirror_ilk() {
    kw_run_prehook ilk

    kw_download_files 'ilk' \
        \
        'IHD_OS_Vol1_Part1.pdf' \
        'IHD_OS_Vol1_Part2.pdf' \
        'IHD_OS_Vol1_Part3.pdf' \
        'IHD_OS_Vol1_Part4.pdf' \
        'IHD_OS_Vol1_Part5.pdf' \
        \
        'IHD_OS_Vol2_Part1.pdf' \
        'IHD_OS_Vol2_Part2.pdf' \
        \
        'IHD_OS_Vol3_Part1.pdf' \
        'IHD_OS_Vol3_Part2.pdf' \
        'IHD_OS_Vol3_Part3.pdf' \
        \
        'IHD_OS_Vol4_Part1.pdf' \
        'IHD_OS_Vol4_Part2.pdf' \

    kw_run_posthook ilk
}

function kw_mirror_g45() {
    kw_run_prehook g45

    kw_download_files 'g45' \
        'Vol_1a_G45_core_updated.pdf' \
        'Vol_2_G45_3dmedia.pdf' \
        'Vol_3_G45_register.pdf' \
        'Vol_4_G45_subsystem.pdf' \

    kw_run_posthook g45
}

function kw_mirror_g35() {
    kw_run_prehook g35

    kw_download_files 'g35' \
        'VOL_1_graphics_core.pdf' \
        'VOL_2_3D_media_web_updated.pdf' \
        'VOL_3_display_registers_updated.pdf' \
        'VOL_4_subsystem_core.pdf' \

    kw_run_posthook g35
}

# ----------------------------------------------
# main
# ----------------------------------------------


if [[ $# -eq 0 ]]; then
    kw_usage_error
fi

if [[ "$1" = "-h" ]] || [[ "$1" = "--help" ]]; then
    kw_print_help
    exit
fi

for x in "$@"; do
    case "$x" in
        "all"|"ivb"|"snb"|"ilk"|"g45"|"g35")
            ;;
        *)
            kw_usage_error
            ;;
    esac
done

kw_load_config

for api in "$@"; do
    case "$1" in
        "ivb")
            kw_mirror_ivb
            ;;
        "snb")
            kw_mirror_snb
            ;;
        "ilk")
            kw_mirror_ilk
            ;;
        "g45")
            kw_mirror_g45
            ;;
        "g35")
            kw_mirror_g35
            ;;
        "all")
            kw_mirror_ivb
            kw_mirror_snb
            kw_mirror_ilk
            kw_mirror_g45
            kw_mirror_g35
            ;;
        *)
            kw_usage_error
            ;;
    esac
done