Switch everything to StructOpt (#277)

* Add types for Rojo's subcommands

* Flesh out CLI types

* Port everything to structopt instead of clap

src/commands/init.rs

@@ -1,17 +1,12 @@
-use std::path::PathBuf;
-
 use failure::Fail;
 
-use crate::project::{Project, ProjectInitError};
+use crate::{
+    cli::{InitCommand, InitKind},
+    project::{Project, ProjectInitError},
+};
 
 #[derive(Debug, Fail)]
 pub enum InitError {
-    #[fail(
-        display = "Invalid project kind '{}', valid kinds are 'place' and 'model'",
-        _0
-    )]
-    InvalidKind(String),
-
     #[fail(display = "Project init error: {}", _0)]
     ProjectInitError(#[fail(cause)] ProjectInitError),
 }
@@ -20,23 +15,16 @@ impl_from!(InitError {
     ProjectInitError => ProjectInitError,
 });
 
-#[derive(Debug)]
-pub struct InitOptions<'a> {
-    pub fuzzy_project_path: PathBuf,
-    pub kind: Option<&'a str>,
-}
-
-pub fn init(options: &InitOptions) -> Result<(), InitError> {
+pub fn init(options: InitCommand) -> Result<(), InitError> {
     let (project_path, project_kind) = match options.kind {
-        Some("place") | None => {
-            let path = Project::init_place(&options.fuzzy_project_path)?;
+        InitKind::Place => {
+            let path = Project::init_place(&options.path)?;
             (path, "place")
         }
-        Some("model") => {
-            let path = Project::init_model(&options.fuzzy_project_path)?;
+        InitKind::Model => {
+            let path = Project::init_model(&options.path)?;
             (path, "model")
         }
-        Some(invalid) => return Err(InitError::InvalidKind(invalid.to_string())),
     };
 
     println!(