Added a test to make sure you can include rust files in chapters

src/renderer/html_handlebars/hbs_renderer.rs

@@ -38,7 +38,9 @@ impl HtmlHandlebars {
             BookItem::Chapter(ref ch)  => 
             {
                 let content = ch.content.clone();
-                let base = ch.path.parent().expect("All chapters must have a parent directory");
+                let base = ch.path.parent()
+                    .map(|dir| ctx.src_dir.join(dir))
+                    .expect("All chapters must have a parent directory");
 
                 // Parse and expand links
                 let content = preprocess::links::replace_all(&content, base)?;
@@ -239,13 +241,14 @@ impl HtmlHandlebars {
 impl Renderer for HtmlHandlebars {
     fn render(&self, book: &MDBook) -> Result<()> {
         let html_config = book.config.html_config().unwrap_or_default();
+        let src_dir = book.root.join(&book.config.book.src);
 
         debug!("[fn]: render");
         let mut handlebars = Handlebars::new();
 
         let theme_dir = match html_config.theme {
-            Some(ref theme) => theme,
-            None => Path::new("theme"),
+            Some(ref theme) => theme.to_path_buf(),
+            None => src_dir.join("theme"),
         };
 
         let theme = theme::Theme::new(theme_dir);
@@ -282,6 +285,7 @@ impl Renderer for HtmlHandlebars {
                 book: book,
                 handlebars: &handlebars,
                 destination: destination.to_path_buf(),
+                src_dir: src_dir.clone(),
                 data: data.clone(),
                 is_index: i == 0,
                 html_config: html_config.clone(),
@@ -595,6 +599,7 @@ struct RenderItemContext<'a> {
     handlebars: &'a Handlebars,
     book: &'a MDBook,
     destination: PathBuf,
+    src_dir: PathBuf,
     data: serde_json::Map<String, serde_json::Value>,
     is_index: bool,
     html_config: HtmlConfig,

tests/dummy_book/src/example.rs

@@ -0,0 +1,6 @@
+fn main() {
+    println!("Hello World!");
+#
+#    // You can even hide lines! :D
+#   println!("I am hidden! Expand the code snippet to see me");
+}

tests/dummy_book/src/second.md

@@ -1 +1,5 @@
 # Second Chapter
+
+This makes sure you can insert runnable Rust files.
+
+{{#playpen example.rs}}

tests/init.rs

@@ -2,6 +2,7 @@ extern crate mdbook;
 extern crate tempdir;
 
 use std::path::PathBuf;
+use std::fs;
 use mdbook::MDBook;
 use mdbook::config::Config;
 use tempdir::TempDir;
@@ -63,7 +64,7 @@ fn book_toml_isnt_required() {
     let temp = TempDir::new("mdbook").unwrap();
     let md = MDBook::init(temp.path()).build().unwrap();
 
-    assert!(!temp.path().join("book.toml").exists());
+    let _ = fs::remove_file(temp.path().join("book.toml"));
 
     md.read_config().unwrap().build().unwrap();
 }

tests/rendered_output.rs

@@ -10,7 +10,6 @@ mod dummy_book;
 use dummy_book::{assert_contains_strings, DummyBook};
 
 use std::fs::{remove_file, File};
-use std::io::Write;
 use std::path::Path;
 use std::ffi::OsStr;
 use walkdir::{DirEntry, WalkDir, WalkDirIterator};
@@ -256,46 +255,45 @@ fn check_spacers() {
 /// not exist.
 #[test]
 fn failure_on_missing_file() {
-    let (md, _temp) = create_missing_setup(Some(false));
+    let (mut md, _temp) = create_missing_setup(false);
 
     // On failure, `build()` does not return a specific error, so assume
     // any error is a failure due to a missing file.
-    assert!(md.read_config().unwrap().build().is_err());
+    assert!(md.build().is_err());
 }
 
 /// Ensure a missing file is created if `create-missing` is true.
 #[test]
 fn create_missing_file_with_config() {
-    let (md, temp) = create_missing_setup(Some(true));
+    let (mut md, temp) = create_missing_setup(true);
 
-    md.read_config().unwrap().build().unwrap();
+    md.build().unwrap();
     assert!(temp.path().join("src").join("intro.md").exists());
 }
 
-/// Ensure a missing file is created if `create-missing` is not set (the default
-/// is true).
-#[test]
-fn create_missing_file_without_config() {
-    let (md, temp) = create_missing_setup(None);
-
-    md.read_config().unwrap().build().unwrap();
-    assert!(temp.path().join("src").join("intro.md").exists());
-}
-
-fn create_missing_setup(create_missing: Option<bool>) -> (MDBook, TempDir) {
+fn create_missing_setup(create_missing: bool) -> (MDBook, TempDir) {
     let temp = DummyBook::new().build().unwrap();
-    let md = MDBook::load(temp.path()).unwrap();
-
-    let mut file = File::create(temp.path().join("book.toml")).unwrap();
-    match create_missing {
-        Some(true) => file.write_all(b"[build]\ncreate-missing = true\n").unwrap(),
-        Some(false) => file.write_all(b"[build]\ncreate-missing = false\n")
-            .unwrap(),
-        None => (),
-    }
-    file.flush().unwrap();
+    let mut md = MDBook::load(temp.path()).unwrap();
 
+    md.config.build.create_missing = create_missing;
     remove_file(temp.path().join("src").join("intro.md")).unwrap();
 
     (md, temp)
 }
+
+/// This makes sure you can include a Rust file with `{{#playpen example.rs}}`.
+/// Specification is in `book-example/src/format/rust.md`
+#[test]
+fn able_to_include_rust_files_in_chapters() {
+    let temp = DummyBook::new().build().unwrap();
+    let mut md = MDBook::load(temp.path()).unwrap();
+    md.build().unwrap();
+
+    let second = temp.path().join("book/second.html");
+
+    let playpen_strings = &[
+        r#"class="playpen""#,
+        r#"println!(&quot;Hello World!&quot;);"#,
+    ];
+    assert_contains_strings(second, playpen_strings);
+}