Added gitpod config

.gitpod.yml

@@ -0,0 +1,12 @@
+ports:
+- port: 3000
+  onOpen: open-preview
+- port: 3001
+  onOpen: ignore
+tasks:
+- init: cargo build
+  command: >
+    cd ./book-example &&
+    ../target/debug/mdbook serve \
+        --hostname 0.0.0.0 \
+        --websocket-url $(echo $GITPOD_WORKSPACE_URL | sed 's/https:\/\//wss:\/\/3001-/g')

README.md

@@ -17,6 +17,7 @@
         <td colspan="2">
             <a href="https://crates.io/crates/mdbook"><img src="https://img.shields.io/crates/v/mdbook.svg"></a>
             <a href="LICENSE"><img src="https://img.shields.io/github/license/rust-lang-nursery/mdBook.svg"></a>
+            <a href="https://gitpod.io/from-referrer/"><img src="https://img.shields.io/badge/setup-automated-blue?logo=gitpod"></a>
         </td>
     </tr>
 </table>
@@ -79,8 +80,11 @@ There are multiple ways to install mdBook.
 
 4. **For Contributions**
 
-   If you want to contribute to mdBook you will have to clone the repository on
-   your local machine:
+   If you want to contribute to mdBook you have two options:
+
+   ***Local Development***
+
+   Clone the repository on your local machine:
 
    ```
    git clone https://github.com/rust-lang-nursery/mdBook.git
@@ -95,6 +99,11 @@ There are multiple ways to install mdBook.
    The resulting binary can be found in `mdBook/target/debug/` under the name
    `mdBook` or `mdBook.exe`.
 
+   ***Online Development***
+
+   You can start a readily configured online workspace using Gitpod.
+
+   [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io#https://github.com/rust-lang-nursery/mdBook)
 
 ## Usage
 

src/cmd/serve.rs

@@ -58,6 +58,13 @@ pub fn make_subcommand<'a, 'b>() -> App<'a, 'b> {
                 .empty_values(false)
                 .help("Port to use for WebSockets livereload connections"),
         )
+        .arg(
+            Arg::with_name("websocket-url")
+                .long("websocket-url")
+                .takes_value(true)
+                .empty_values(false)
+                .help("URL to use for WebSockets livereload connections (Defaults to 'ws://{websocket-hostname}:{websocket-port})')"),
+        )
         .arg_from_usage("-o, --open 'Opens the book server in a web browser'")
 }
 
@@ -67,17 +74,21 @@ pub fn execute(args: &ArgMatches) -> Result<()> {
     let mut book = MDBook::load(&book_dir)?;
 
     let port = args.value_of("port").unwrap();
-    let ws_port = args.value_of("websocket-port").unwrap();
     let hostname = args.value_of("hostname").unwrap();
-    let public_address = args.value_of("websocket-hostname").unwrap_or(hostname);
+    let ws_port = args.value_of("websocket-port").unwrap();
+    let ws_hostname = args.value_of("websocket-hostname").unwrap_or(hostname);
+    let ws_url = match args.value_of("websocket-url") {
+        Some(url) => String::from(url),
+        None => format!("ws://{}:{}", ws_hostname, ws_port)
+    };
+    let ws_url = &ws_url[..];
     let open_browser = args.is_present("open");
 
     let address = format!("{}:{}", hostname, port);
     let ws_address = format!("{}:{}", hostname, ws_port);
 
-    let livereload_url = format!("ws://{}:{}", public_address, ws_port);
     book.config
-        .set("output.html.livereload-url", &livereload_url)?;
+        .set("output.html.livereload-url", &ws_url)?;
 
     if let Some(dest_dir) = args.value_of("dest-dir") {
         book.config.build.build_dir = dest_dir.into();
@@ -117,7 +128,7 @@ pub fn execute(args: &ArgMatches) -> Result<()> {
         let result = MDBook::load(&book_dir)
             .and_then(|mut b| {
                 b.config
-                    .set("output.html.livereload-url", &livereload_url)?;
+                    .set("output.html.livereload-url", &ws_url)?;
                 Ok(b)
             })
             .and_then(|b| b.build());