Adds --theme-only option which will only copy the theme folder

guide/src/cli/init.md

@@ -52,3 +52,8 @@ directory called `theme` in your source directory so that you can modify it.
 
 The theme is selectively overwritten, this means that if you don't want to
 overwrite a specific file, just delete it and the default file will be used.
+
+#### --theme-only
+
+Optionally you can use `--theme-only` flag, only the default theme will be copied into a
+directory called `theme` in your source directory so that you can modify it.

src/book/init.rs

@@ -106,7 +106,9 @@ impl BookBuilder {
         Ok(())
     }
 
-    fn copy_across_theme(&self) -> Result<()> {
+    /// Copies the theme to the generated book (so users can tweak
+    /// it)?
+    pub fn copy_across_theme(&self) -> Result<()> {
         debug!("Copying theme");
 
         let html_config = self.config.html_config().unwrap_or_default();

src/cmd/init.rs

@@ -17,6 +17,7 @@ pub fn make_subcommand<'a, 'b>() -> App<'a, 'b> {
              (Defaults to the Current Directory when omitted)'",
         )
         .arg_from_usage("--theme 'Copies the default theme into your source folder'")
+        .arg_from_usage("--theme-only 'Copies only the default theme into your source folder'")
         .arg_from_usage("--force 'Skips confirmation prompts'")
 }
 
@@ -27,7 +28,10 @@ pub fn execute(args: &ArgMatches) -> Result<()> {
     let mut config = config::Config::default();
 
     // If flag `--theme` is present, copy theme to src
-    if args.is_present("theme") {
+    if args.is_present("theme-only") {
+        builder.copy_across_theme();
+        return Ok(());
+    } else if args.is_present("theme") {
         let theme_dir = book_dir.join("theme");
         println!();
         println!("Copying the default theme to {}", theme_dir.display());