Add 'rojo doc' command

src/bin.rs

@@ -11,6 +11,7 @@ fn run(subcommand: Subcommand) -> Result<(), Box<dyn Error>> {
         Subcommand::Serve(serve_options) => cli::serve(serve_options)?,
         Subcommand::Build(build_options) => cli::build(build_options)?,
         Subcommand::Upload(upload_options) => cli::upload(upload_options)?,
+        Subcommand::Doc => cli::doc()?,
     }
 
     Ok(())

src/cli/doc.rs

@@ -0,0 +1,26 @@
+use opener::{open, OpenError};
+use snafu::Snafu;
+
+#[derive(Debug, Snafu)]
+pub struct DocError(Error);
+
+#[derive(Debug, Snafu)]
+enum Error {
+    Open { source: OpenError },
+}
+
+impl From<OpenError> for Error {
+    fn from(source: OpenError) -> Self {
+        Error::Open { source }
+    }
+}
+
+pub fn doc() -> Result<(), DocError> {
+    doc_inner()?;
+    Ok(())
+}
+
+fn doc_inner() -> Result<(), Error> {
+    open("https://rojo.space/docs")?;
+    Ok(())
+}

src/cli/mod.rs

@@ -1,6 +1,7 @@
 //! Defines Rojo's CLI through structopt types.
 
 mod build;
+mod doc;
 mod init;
 mod serve;
 mod upload;
@@ -17,6 +18,7 @@ use std::{
 use structopt::StructOpt;
 
 pub use self::build::*;
+pub use self::doc::*;
 pub use self::init::*;
 pub use self::serve::*;
 pub use self::upload::*;
@@ -48,6 +50,9 @@ pub enum Subcommand {
 
     /// Generates a place or model file out of the project and uploads it to Roblox.
     Upload(UploadCommand),
+
+    /// Open Rojo's documentation in your browser.
+    Doc,
 }
 
 /// Initializes a new Rojo project.