#!/bin/sh
set -eu

resolve_root() {
    dir=$1
    set -- "$dir"/*
    if [ "$#" -eq 1 ] && [ -d "$1" ]; then
        printf '%s\n' "$1"
    else
        printf '%s\n' "$dir"
    fi
}

depot_install() {
    : "${DESTDIR:?DESTDIR is not set}"

    bin_archive=
    src_archive=

    for f in ./*.tar.gz; do
        [ -f "$f" ] || continue
        case "$(basename "$f")" in
            pandoc-*-linux-amd64.tar.gz) bin_archive=$f ;;
            *) src_archive=$f ;;
        esac
    done

    [ -n "${bin_archive}" ] || {
        echo "missing pandoc binary archive" >&2
        exit 1
    }
    [ -n "${src_archive}" ] || {
        echo "missing pandoc source archive" >&2
        exit 1
    }

    tmpdir=$(mktemp -d)
    trap 'rm -rf "$tmpdir"' EXIT HUP INT TERM

    bin_unpack=$tmpdir/bin
    src_unpack=$tmpdir/src
    mkdir -p "$bin_unpack" "$src_unpack"

    tar -xzf "$bin_archive" -C "$bin_unpack"
    tar -xzf "$src_archive" -C "$src_unpack"

    bin_root=$(resolve_root "$bin_unpack")
    src_root=$(resolve_root "$src_unpack")

    install -d "$DESTDIR/usr"
    install -d "$DESTDIR/usr/share/pandoc"

    cp -a "$bin_root/bin" "$bin_root/share" "$DESTDIR/usr/"
    cp -a "$src_root/data" "$src_root/citeproc" "$DESTDIR/usr/share/pandoc/"

    install -Dm644 "$src_root/COPYRIGHT" "$DESTDIR/usr/share/pandoc/COPYRIGHT"
    install -Dm644 "$src_root/MANUAL.txt" "$DESTDIR/usr/share/pandoc/MANUAL.txt"

    "$bin_root/bin/pandoc" --bash-completion | \
        install -Dm644 /dev/stdin "$DESTDIR/usr/share/bash-completion/completions/pandoc"
}