Added a utility method to remove all content of a dir but not the dir itelf. Fixes #32

src/book/mdbook.rs

@@ -3,7 +3,7 @@ use std::fs::{self, File};
 use std::io::Write;
 use std::error::Error;
 
-use {BookConfig, BookItem, theme, parse};
+use {BookConfig, BookItem, theme, parse, utils};
 use book::BookItems;
 use renderer::{Renderer, HtmlHandlebars};
 use utils::{PathExt, create_path};
@@ -142,6 +142,9 @@ impl MDBook {
 
         try!(self.parse_summary());
 
+        // Clean output directory
+        try!(utils::remove_dir_content(&self.config.get_dest()));
+
         try!(self.renderer.render(
             self.iter(),
             &self.config,

src/utils/mod.rs

@@ -118,3 +118,15 @@ pub fn create_file(path: &Path) -> Result<File, Box<Error>> {
 
     Ok(f)
 }
+
+/// Removes all the content of a directory but not the directory itself
+
+pub fn remove_dir_content(dir: &Path) -> Result<(), Box<Error>> {
+    for item in try!(fs::read_dir(dir)) {
+        if let Ok(item) = item {
+            let item = item.path();
+            if item.is_dir() { try!(fs::remove_dir_all(item)); } else { try!(fs::remove_file(item)); }
+        }
+    }
+    Ok(())
+}