Added arg for init to specify directory

src/main.rs

@@ -1,6 +1,7 @@
 extern crate mdbook;
 extern crate getopts;
 use std::env;
+use std::path::PathBuf;
 
 use mdbook::MDBook;
 
@@ -112,7 +113,12 @@ fn init(args: Vec<String>) {
         return;
     }
 
-    let dir = std::env::current_dir().unwrap();
+    let dir = if args.len() <= 2 {
+        std::env::current_dir().unwrap()
+    } else {
+        std::env::current_dir().unwrap().join(&args[2])
+    };
+
     let book = MDBook::new();
 
     if let Err(e) = book.init(&dir) {
@@ -140,6 +146,13 @@ fn build(args: Vec<String>) {
     if matches.opt_present("help") {
         println!("{}", usage);
     }
+
+    let dir = std::env::current_dir().unwrap();
+    let book = MDBook::new();
+
+    if let Err(e) = book.build(&dir) {
+        println!("Error: {}", e);
+    }
 }
 
 fn watch(args: Vec<String>) {

src/mdbook.rs

@@ -1,6 +1,8 @@
 use std::path::PathBuf;
 use std::fs::{self, File, metadata};
 use std::io::Write;
+use std::io::{Error, ErrorKind};
+//use std::error::Error;
 
 pub struct MDBook {
     dest: PathBuf,
@@ -8,6 +10,7 @@ pub struct MDBook {
 }
 
 impl MDBook {
+
     pub fn new() -> Self {
         MDBook {
             dest: PathBuf::from("book"),
@@ -15,11 +18,11 @@ impl MDBook {
         }
     }
 
-    pub fn init(&self, dir: &PathBuf) -> Result<(),&str> {
+    pub fn init(&self, dir: &PathBuf) -> Result<(), Error> {
 
         // Hacky way to check if the directory exists... Until PathExt moves to stable
         match metadata(dir) {
-            Err(_) => return Err("Destination path does not exist"),
+            Err(_) => return Err(Error::new(ErrorKind::Other, "Directory does not exist")),
             _ => {}
         }
 
@@ -69,17 +72,22 @@ impl MDBook {
         };
 
         if let Ok(mut f) = summary {
-            writeln!(f, "# Summary");
-            writeln!(f, "");
-            writeln!(f, "[Chapter 1](./chapter_1.md)");
+            try!(writeln!(f, "# Summary"));
+            try!(writeln!(f, ""));
+            try!(writeln!(f, "[Chapter 1](./chapter_1.md)"));
 
             let mut chapter_1 = File::create(&src.join("chapter_1.md")).unwrap();
-            writeln!(chapter_1, "# Chapter 1");
+            try!(writeln!(chapter_1, "# Chapter 1"));
         }
 
         return Ok(());
     }
 
+    pub fn build(&self, dir: &PathBuf) -> Result<(), Error> {
+
+        Ok(())
+    }
+
     pub fn set_dest(mut self, dest: PathBuf) -> Self {
         self.dest =  dest;
         self
@@ -89,4 +97,5 @@ impl MDBook {
         self.src = src;
         self
     }
+
 }