Put render novel into separate function

Cargo.lock

@@ -170,6 +170,7 @@ dependencies = [
  "data-stream",
  "dialogi",
  "header-config",
+ "indexmap",
  "maud",
  "percent-encoding",
  "pukram2html",

Cargo.toml

@@ -12,3 +12,4 @@ dialogi = "0.3.1"
 vn-settings = "0.1.0"
 threadpool = "1.8.1"
 header-config = "0.1.5"
+indexmap = "2.9.0"

src/main.rs

@@ -21,6 +21,7 @@ use data_stream::{
 use dialog::parse_map;
 use dialogi::DialogParameter;
 use header_config::parse_config;
+use indexmap::IndexMap;
 use maud::html;
 use percent_encoding::percent_decode_str;
 use pukram2html::{Settings, convert, convert_extended, convert_subheader};
@@ -604,7 +605,12 @@ fn handle_relative_connection(
         .map(|parent| parse_config(&parent.with_extension("vng")).ok())
         .unwrap_or_default();
 
-    if let Some(mut config_map) = config_map {
+    fn render_novel(
+        mut config_map: IndexMap<Box<str>, Box<str>>,
+        pk_path: &Path,
+        stream: &mut TcpStream,
+        start_level: usize,
+    ) -> std::result::Result<(), dialogi::ParsingError> {
         let mut player_settings = PlayerSettings {
             colors: ColorSettings::common(),
             timing: TimingSettings::common(),
@@ -646,10 +652,7 @@ fn handle_relative_connection(
             }
         }
 
-        let Ok(dialogs) = parse_map(file_paths.pk, &mut settings_context) else {
-            fail(stream);
-            return;
-        };
+        let dialogs = parse_map(pk_path, &mut settings_context)?;
 
         let mut sections = Vec::new();
 
@@ -885,6 +888,15 @@ fn handle_relative_connection(
         };
 
         let _ = write!(stream, "{}", html.into_string());
+
+        Ok(())
+    }
+
+    if let Some(config_map) = config_map {
+        if render_novel(config_map, file_paths.pk, &mut stream, start_level).is_err() {
+            fail(stream);
+            return;
+        }
     } else {
         let Ok(pk_file) = File::open(file_paths.pk) else {
             unreachable!();