Add the new book struct

src/book/book.rs

@@ -0,0 +1,77 @@
+use book::metadata::BookMetadata;
+use book::chapter::Chapter;
+
+
+/// The `Book` struct contains the metadata and chapters for one language of the book.
+/// Multiple `Book` structs are combined in the `MDBook` struct to support multi-language books.
+pub struct Book {
+    metadata: BookMetadata,
+
+    preface: Vec<Chapter>,
+    chapters: Vec<Chapter>,
+    appendix: Vec<Chapter>,
+}
+
+impl Book {
+    /// Creates a new book with the given title, chapters are added with the `add_chapter` method
+    pub fn new(title: &str) -> Self {
+        Book {
+            metadata: BookMetadata::new(title),
+
+            preface: Vec::new(),
+            chapters: Vec::new(),
+            appendix: Vec::new(),
+        }
+    }
+
+    /// Adds a new chapter at the end of the book
+    pub fn add_chapter(&mut self, chapter: Chapter) -> &mut Self {
+        self.chapters.push(chapter);
+        self
+    }
+
+    /// Adds a new preface chapter to the book, the preface chapters are in the order they were added
+    pub fn add_preface_chapter(&mut self, chapter: Chapter) -> &mut Self {
+        self.preface.push(chapter);
+        self
+    }
+
+    /// Adds a new appendix chapter to the book, they are in de order they are added
+    pub fn add_appendix_chapter(&mut self, chapter: Chapter) -> &mut Self {
+        self.appendix.push(chapter);
+        self
+    }
+
+
+    /// This method takes a slice `&[x, y, z]` as parameter and returns the corresponding chapter.
+    /// For example, to retrieve chapter 2.3 we would use:
+    /// ```
+    /// #extern crate mdbook;
+    /// #use mdbook::book::Book;
+    /// #fn main() {
+    /// #let book = Book::new("Test");
+    /// let chapter_2_3 = book.get_chapter(&[2, 3]);
+    /// #}
+    /// ```
+    pub fn get_chapter(&self, section: &[usize]) -> Option<&Chapter> {
+        match section.len() {
+            0 => None,
+            1 => self.chapters.get(section[0]),
+            _ => {
+                self.chapters
+                    .get(section[0])
+                    .and_then(|ch| ch.get_sub_chapter(&section[1..]))
+            },
+        }
+    }
+
+    /// Returns a mutable reference to the metadata for modification
+    pub fn mut_metadata(&mut self) -> &mut BookMetadata {
+        &mut self.metadata
+    }
+
+    // Returns a reference to the metadata
+    pub fn metadata(&self) -> &BookMetadata {
+        &self.metadata
+    }
+}

src/book/chapter.rs

@@ -1,5 +1,3 @@
-use book::metadata::BookMetadata;
-
 use std::path;
 
 /// The Chapter struct holds the title of the chapter as written in the SUMMARY.md file,

src/book/mod.rs

@@ -1,5 +1,12 @@
 pub mod bookitem;
 pub mod bookconfig;
+pub mod metadata;
+pub mod chapter;
+pub mod book;
+
+pub use self::metadata::{Author, Language, BookMetadata};
+pub use self::chapter::Chapter;
+pub use self::book::Book;
 
 pub use self::bookitem::{BookItem, BookItems};
 pub use self::bookconfig::BookConfig;