implemented serve command and added async runtime

Cargo.toml

@@ -11,8 +11,12 @@ license-file = "LICENSE.txt"
 bytes = "1.4.0"
 clap = { version = "4.1.8", features = ["derive"] }
 colored = "2.0.0"
+futures = "0.3.26"
 home = "0.5.4"
+live-server = "0.6.0"
+notify = { version = "5.1.0", features = ["serde"] }
 regex = "1.7.1"
 reqwest = { version = "0.11.14", features = ["blocking"] }
 text_io = "0.1.12"
+tokio = { version = "1.26.0", features = ["full"] }
 zip-extract = "0.1.1"

src/app/commands/serve.rs

@@ -1,3 +1,110 @@
-pub fn serve() {
-    println!("serving the developement version")
+use colored::Colorize;
+use live_server::listen;
+use notify::{
+    event::{self, ModifyKind},
+    Config, Event, EventKind, RecommendedWatcher, RecursiveMode, Watcher,
+};
+use std::{env, path::Path};
+use tokio::sync::mpsc::{channel, Receiver};
+
+use crate::app::{
+    builder::{
+        asciidoctor::{AsciiDoctorDocsBuilder, AsciiDoctorSlideBuilder},
+        Builder,
+    },
+    fs_util,
+};
+
+pub async fn serve() {
+    tokio::join!(watch_and_build(), start_server());
+
+    println!("stopping live server");
+}
+
+async fn watch_and_build() {
+    watch(Path::new("./docs"))
+        .await
+        .expect("something went wrong")
+}
+
+async fn start_server() {
+    println!("Serving at http://localhost:8080");
+
+    let Ok(()) = listen("localhost", 8080, "./dist").await else {
+        panic!("could not start server")
+    };
+}
+
+async fn watch(path: &Path) -> notify::Result<()> {
+    let (mut watcher, mut rx) = watcher()?;
+
+    watcher.watch(path.as_ref(), RecursiveMode::Recursive)?;
+
+    while let Some(res) = rx.recv().await {
+        match res {
+            Ok(event) => file_change(event),
+            Err(e) => println!("watch error: {:?}", e),
+        }
+    }
+
+    Ok(())
+}
+
+fn file_change(event: Event) {
+    match event.kind {
+        EventKind::Modify(ModifyKind::Data(_)) => {
+            build_file(event.paths).expect("building file failed");
+            ()
+        }
+        _ => (),
+    }
+}
+
+fn build_file(paths: Vec<std::path::PathBuf>) -> Result<(), String> {
+    let invalid_path_message = "changed path is invalid";
+    let in_path = paths
+        .first()
+        .expect(invalid_path_message)
+        .to_str()
+        .expect(invalid_path_message)
+        .replace(&current_dir(), "")
+        .replace("/./", "./");
+    let out_path = in_path
+        .replace("./docs/", "./dist/")
+        .replace(".adoc", ".html");
+
+    println!("{} {}", "[Rebuilding]".green(), in_path);
+
+    if in_path.starts_with("./docs/slides") {
+        let slide_builder = AsciiDoctorSlideBuilder {};
+        slide_builder.build(&in_path, &out_path)
+    } else {
+        let doc_builder = AsciiDoctorDocsBuilder {};
+        doc_builder.build(&in_path, &out_path)
+    }
+}
+
+fn current_dir() -> String {
+    let err_message = "something went wrong";
+    return String::from(
+        env::current_dir()
+            .expect(err_message)
+            .to_str()
+            .expect(err_message),
+    );
+}
+
+fn watcher() -> notify::Result<(RecommendedWatcher, Receiver<notify::Result<Event>>)> {
+    let (tx, rx) = channel(1);
+
+    let watcher = RecommendedWatcher::new(
+        move |res| {
+            futures::executor::block_on(async {
+                tx.send(res).await.unwrap();
+            });
+        },
+        Config::default(),
+    )?;
+
+    Ok((watcher, rx))
 }

src/app/mod.rs

@@ -15,16 +15,16 @@ pub struct App;
 
 impl App {
 
-    pub fn start(&self) {
+    pub async fn start(&self) {
         let args = args();
         Self::setup_environment_variables();
 
         match args.command {
-            CommandArg::Build => build(),
+            CommandArg::Build => build().await,
             CommandArg::Health => health(),
-            CommandArg::InstallReveal => install_reveal(),
-            CommandArg::Serve => serve()
-        }
+            CommandArg::InstallReveal => install_reveal().await,
+            CommandArg::Serve => serve().await
+        };
     }
 
     fn setup_environment_variables() {

src/main.rs

@@ -5,7 +5,8 @@ mod test;
 
 use app::App;
 
-fn main() {
+#[tokio::main]
+async fn main() {
     let app = App::new();
-    app.start();
+    app.start().await;
 }