Make Preprocessor context store config and root

src/book/mod.rs

@@ -157,9 +157,7 @@ impl MDBook {
         debug!("[fn]: build");
 
         let mut preprocessed_book = self.book.clone();
-        let preprocess_ctx = PreprocessorContext {
-            src_dir: self.source_dir(),
-        };
+        let preprocess_ctx = PreprocessorContext::new(self.root.clone(), self.config.clone());
 
         for preprocessor in &self.preprocessors {
             preprocessor.run(&preprocess_ctx, &mut preprocessed_book)?;
@@ -222,10 +220,7 @@ impl MDBook {
 
         let temp_dir = TempDir::new("mdbook")?;
 
-        let src_dir = self.source_dir();
-        let preprocess_context = PreprocessorContext {
-            src_dir
-        };
+        let preprocess_context = PreprocessorContext::new(self.root.clone(), self.config.clone());
 
         LinkPreprocessor::new().run(&preprocess_context, &mut self.book)?;
 

src/preprocess/links.rs

@@ -24,11 +24,13 @@ impl Preprocessor for LinkPreprocessor {
     }
 
     fn run(&self, ctx: &PreprocessorContext, book: &mut Book) -> Result<()> {
+        let src_dir = ctx.root.join(&ctx.config.book.src);
+
         for section in &mut book.sections {
             match *section {
                 BookItem::Chapter(ref mut ch) => {
                     let base = ch.path.parent()
-                        .map(|dir| ctx.src_dir.join(dir))
+                        .map(|dir| src_dir.join(dir))
                         .ok_or_else(|| String::from("Invalid bookitem path!"))?;
                     let content = replace_all(&ch.content, base)?;
                     ch.content = content

src/preprocess/mod.rs

@@ -3,12 +3,20 @@ pub use self::links::LinkPreprocessor;
 mod links;
 
 use book::Book;
+use config::Config;
 use errors::*;
 
 use std::path::PathBuf;
 
 pub struct PreprocessorContext {
-    pub src_dir: PathBuf
+    pub root: PathBuf,
+    pub config: Config,
+}
+
+impl PreprocessorContext {
+    pub fn new(root: PathBuf, config: Config) -> Self {
+        PreprocessorContext { root, config }
+    }
 }
 
 pub trait Preprocessor {