generate::make_link () {
    local -r what="$1"; shift
    local -r line="${1/=> }"; shift
    local link
    local descr

    while read -r token; do
        if [ -z "$link" ]; then
            link="$token"
        elif [ -z "$descr" ]; then
            descr="$token"
        else
            descr="$descr $token"
        fi
    done < <(echo "$line" | tr ' ' '\n')

    if grep -E -q "$IMAGE_PATTERN" <<< "$link"; then
        if [ $what == md ]; then
            md::make_img "$link" "$descr"
        else
            html::make_img "$link" "$(html::special "$descr")"
        fi
        return
    fi

    if [ $what == md ]; then
        md::make_link "$link" "$descr"
    else
        html::make_link "$link" "$(html::special "$descr")"
    fi
}

generate::fromgmi_ () {
    local -r src="$1"; shift
    local -r format="$1"; shift
    local dest=${src/gemtext/$format}
    dest=${dest/.gmi/.$format}
    local dest_dir=$(dirname "$dest")

    test ! -d "$dest_dir" && mkdir -p "$dest_dir"
    if [ $format == html ]; then
        cat header.html.part > "$dest.tmp"
        html::fromgmi < "$src" >> "$dest.tmp"
        cat footer.html.part >> "$dest.tmp"
    elif [ $format == md ]; then
        md::fromgmi < "$src" >> "$dest.tmp"
    fi

    mv "$dest.tmp" "$dest"
    test "$ADD_GIT" == yes && git add "$dest"
}

generate::fromgmi_add_docs () {
    local -r src="$1"; shift
    local -r format="$1"; shift
    local -r dest=${src/gemtext/$format}
    local -r dest_dir=$(dirname "$dest")

    test ! -d "$dest_dir" && mkdir -p "$dest_dir"
    cp "$src" "$dest"
    test "$ADD_GIT" == yes && git add "$dest"
}

generate::fromgmi_convert_atom () {
    local -r format="$1"; shift

    test $format != html && return
    $SED 's|.gmi|.html|g; s|gemini://|https://|g' \
        < $CONTENT_DIR/gemtext/gemfeed/atom.xml \
        > $CONTENT_DIR/html/gemfeed/atom.xml
    test "$ADD_GIT" == yes && git add $CONTENT_DIR/html/gemfeed/atom.xml
}

generate::fromgmi_cleanup () {
    local -r src="$1"; shift
    local -r format="$1"; shift
    local dest=${src/.$format/.gmi}
    dest=${dest/$format/gemtext}

    test ! -f "$dest" && test "$ADD_GIT" == yes && git rm "$src"
}

generate::fromgmi () {
    find $CONTENT_DIR/gemtext -type f -name \*.gmi | while read -r src; do
        for format in "$@"; do
            generate::fromgmi_ "$src" "$format"
        done
    done

    # Add non-.gmi files to html dir.
    find $CONTENT_DIR/gemtext -type f | grep -E -v '(.gmi|atom.xml|.tmp)$' |
    while read -r src; do
        for format in "$@"; do
            generate::fromgmi_add_docs "$src" "$format"
        done
    done

    # Add atom feed for HTML
    for format in "$@"; do
        generate::fromgmi_convert_atom "$format"
    done

    # Remove obsolete files from ./html/
    for format in "$@"; do
        find $CONTENT_DIR/$format -type f | while read -r src; do
            generate::fromgmi_cleanup "$src" "$format"
        done
    done
}