render_code_block() {
	dir=$1
	src=$2
	lang=$(normalize_lang "$3")
	open_attr=$(details_open_attr "$4")
	title=$5
	note=$6
	footer=$7
	header=$8

	[ -n "$title" ] || title=$src
	if ! safe_file_path "$dir" "$src"; then
		render_missing_block "Unsafe code source path: $src" "$title" "$note" "$header"
		return
	fi
	if ! safe_lang "$lang"; then
		render_missing_block "Unsafe code language: $lang" "$title" "$note" "$header"
		return
	fi

	code_file=$dir/$src
	title_html=$(html_escape_attr "$title")
	raw_href=articles/${dir##*/}/$src
	lang_attr=
	highlight_tmp=$tmp/code.html

	[ -n "$lang" ] && lang_attr=" data-lang=\"$lang\""

	if [ ! -f "$code_file" ]; then
		render_missing_block "Missing code source: $src" "$title" "$note" "$header"
		return
	fi
	if show_header "$header"; then
		want_header=1
		if [ -z "$footer" ] &&
		    file_line_count_le "$code_file" "$code_footer_lines"; then
			footer=false
		fi
		if show_footer "$footer"; then
			want_footer=1
		else
			want_footer=0
		fi
	else
		want_header=0
		if show_explicit_footer "$footer"; then
			want_footer=1
		else
			want_footer=0
		fi
	fi

	if [ "$want_header" = 1 ]; then
		next_block_id
	fi
	if [ "$want_footer" = 1 ]; then
		size=$(format_size "$code_file")
	fi
	rm -f "$highlight_tmp"
	case $highlighter in
		none)
			raw_code_blocks=$((raw_code_blocks + 1))
			;;
		*)
			if highlight_code "$code_file" "$lang" "$highlight_tmp" 2>/dev/null &&
			   { [ ! -s "$code_file" ] || [ -s "$highlight_tmp" ]; }; then
				highlighted_blocks=$((highlighted_blocks + 1))
			else
				rm -f "$highlight_tmp"
				raw_code_blocks=$((raw_code_blocks + 1))
			fi
			;;
	esac

	if [ "$want_header" = 1 ]; then
		printf '<details class="code-details"%s>\n' "$open_attr"
		if [ "$want_footer" = 1 ]; then
			render_block_summary "$title" "$note" "$raw_href" "$block_id" "$block_id-footer"
		else
			render_block_summary "$title" "$note" "$raw_href" "$block_id" ''
		fi
		block_class=code-block
	elif [ "$want_footer" = 1 ]; then
		printf '<div class="block-standalone">\n'
		block_class=code-block
	else
		block_class='code-block code-block-standalone'
	fi
	printf '  <pre class="%s" data-src="%s" data-title="%s"%s><code>' \
		"$block_class" "$src" "$title_html" "$lang_attr"
	if [ -f "$highlight_tmp" ]; then
		cat "$highlight_tmp"
	else
		html_escape "$code_file"
	fi
	printf '</code></pre>\n'
	if [ "$want_footer" = 1 ]; then
		if [ "$want_header" = 1 ]; then
			render_block_footer "$title" "$size" "$raw_href" "$block_id" "$block_id-footer"
		else
			render_block_footer "$title" "$size" "$raw_href" '' ''
		fi
	fi
	if [ "$want_header" = 1 ]; then
		printf '</details>\n'
	elif [ "$want_footer" = 1 ]; then
		printf '</div>\n'
	fi
}