Fix heading links in nested pages

src/renderer/html_handlebars/hbs_renderer.rs

@@ -63,14 +63,16 @@ impl HtmlHandlebars {
                 debug!("[*]: Render template");
                 let rendered = ctx.handlebars.render("index", &ctx.data)?;
 
-                let filename = Path::new(&ch.path).with_extension("html");
+                let filepath = Path::new(&ch.path).with_extension("html");
                 let rendered = self.post_process(rendered,
-                    filename.file_name().unwrap().to_str().unwrap_or(""),
-                    ctx.book.get_html_config().get_playpen_config());
+                    &normalize_path(filepath.to_str()
+                        .ok_or(Error::from(format!("Bad file name: {}", filepath.display())))?),
+                    ctx.book.get_html_config().get_playpen_config()
+                );
 
                 // Write to file
-                info!("[*] Creating {:?} ✓", filename.display());
-                ctx.book.write_file(filename, &rendered.into_bytes())?;
+                info!("[*] Creating {:?} ✓", filepath.display());
+                ctx.book.write_file(filepath, &rendered.into_bytes())?;
 
                 if ctx.is_index {
                     self.render_index(ctx.book, ch, &ctx.destination)?;
@@ -111,9 +113,9 @@ impl HtmlHandlebars {
         Ok(())
     }
 
-    fn post_process(&self, rendered: String, filename: &str, playpen_config: &PlaypenConfig) -> String {
-        let rendered = build_header_links(&rendered, filename);
-        let rendered = fix_anchor_links(&rendered, filename);
+    fn post_process(&self, rendered: String, filepath: &str, playpen_config: &PlaypenConfig) -> String {
+        let rendered = build_header_links(&rendered, &filepath);
+        let rendered = fix_anchor_links(&rendered, &filepath);
         let rendered = fix_code_blocks(&rendered);
         let rendered = add_playpen_pre(&rendered, playpen_config);
 
@@ -182,7 +184,7 @@ impl HtmlHandlebars {
         Ok(())
     }
 
-    /// Helper function to write a file to the build directory, normalizing 
+    /// Helper function to write a file to the build directory, normalizing
     /// the path to be relative to the book root.
     fn write_custom_file(&self, custom_file: &Path, book: &MDBook) -> Result<()> {
         let mut data = Vec::new();
@@ -284,7 +286,7 @@ impl Renderer for HtmlHandlebars {
 
         let rendered = self.post_process(rendered, "print.html",
             book.get_html_config().get_playpen_config());
-        
+
         book.write_file(
             Path::new("print").with_extension("html"),
             &rendered.into_bytes(),
@@ -412,7 +414,7 @@ fn make_data(book: &MDBook) -> Result<serde_json::Map<String, serde_json::Value>
 
 /// Goes through the rendered HTML, making sure all header tags are wrapped in
 /// an anchor so people can link to sections directly.
-fn build_header_links(html: &str, filename: &str) -> String {
+fn build_header_links(html: &str, filepath: &str) -> String {
     let regex = Regex::new(r"<h(\d)>(.*?)</h\d>").unwrap();
     let mut id_counter = HashMap::new();
 
@@ -422,14 +424,14 @@ fn build_header_links(html: &str, filename: &str) -> String {
                 "Regex should ensure we only ever get numbers here",
             );
 
-            wrap_header_with_link(level, &caps[2], &mut id_counter, filename)
+            wrap_header_with_link(level, &caps[2], &mut id_counter, filepath)
         })
         .into_owned()
 }
 
 /// Wraps a single header tag with a link, making sure each tag gets its own
 /// unique ID by appending an auto-incremented number (if necessary).
-fn wrap_header_with_link(level: usize, content: &str, id_counter: &mut HashMap<String, usize>, filename: &str)
+fn wrap_header_with_link(level: usize, content: &str, id_counter: &mut HashMap<String, usize>, filepath: &str)
     -> String {
     let raw_id = id_from_content(content);
 
@@ -443,11 +445,11 @@ fn wrap_header_with_link(level: usize, content: &str, id_counter: &mut HashMap<S
     *id_count += 1;
 
     format!(
-        r#"<a class="header" href="{filename}#{id}" id="{id}"><h{level}>{text}</h{level}></a>"#,
+        r##"<a class="header" href="{filepath}#{id}" id="{id}"><h{level}>{text}</h{level}></a>"##,
         level = level,
         id = id,
         text = content,
-        filename = filename
+        filepath = filepath
     )
 }
 
@@ -457,7 +459,7 @@ fn id_from_content(content: &str) -> String {
     let mut content = content.to_string();
 
     // Skip any tags or html-encoded stuff
-    let repl_sub = vec![
+    const REPL_SUB: &[&str] = &[
         "<em>",
         "</em>",
         "<code>",
@@ -470,27 +472,17 @@ fn id_from_content(content: &str) -> String {
         "&#39;",
         "&quot;",
     ];
-    for sub in repl_sub {
+    for sub in REPL_SUB {
         content = content.replace(sub, "");
     }
 
-    let mut id = String::new();
-
-    for c in content.chars() {
-        if c.is_alphanumeric() || c == '-' || c == '_' {
-            id.push(c.to_ascii_lowercase());
-        } else if c.is_whitespace() {
-            id.push(c);
-        }
-    }
-
-    id
+    normalize_id(&content)
 }
 
 // anchors to the same page (href="#anchor") do not work because of
 // <base href="../"> pointing to the root folder. This function *fixes*
 // that in a very inelegant way
-fn fix_anchor_links(html: &str, filename: &str) -> String {
+fn fix_anchor_links(html: &str, filepath: &str) -> String {
     let regex = Regex::new(r##"<a([^>]+)href="#([^"]+)"([^>]*)>"##).unwrap();
     regex
         .replace_all(html, |caps: &Captures| {
@@ -499,9 +491,9 @@ fn fix_anchor_links(html: &str, filename: &str) -> String {
             let after = &caps[3];
 
             format!(
-                "<a{before}href=\"{filename}#{anchor}\"{after}>",
+                "<a{before}href=\"{filepath}#{anchor}\"{after}>",
                 before = before,
-                filename = filename,
+                filepath = filepath,
                 anchor = anchor,
                 after = after
             )
@@ -592,6 +584,26 @@ struct RenderItemContext<'a> {
     is_index: bool,
 }
 
+pub fn normalize_path(path: &str) -> String {
+    use std::path::is_separator;
+    path.chars()
+        .map(|ch| if is_separator(ch) { '/' } else { ch })
+        .collect::<String>()
+}
+
+pub fn normalize_id(content: &str) -> String {
+    content.chars()
+        .filter_map(|ch|
+            if ch.is_alphanumeric() || ch == '_' {
+                Some(ch.to_ascii_lowercase())
+            } else if ch.is_whitespace() {
+                Some('-')
+            } else {
+                None
+            }
+        )
+        .collect::<String>()
+}
 
 
 #[cfg(test)]
@@ -601,17 +613,39 @@ mod tests {
     #[test]
     fn original_build_header_links() {
         let inputs = vec![
-            ("blah blah <h1>Foo</h1>", r#"blah blah <a class="header" href="bar.rs#foo" id="foo"><h1>Foo</h1></a>"#),
-            ("<h1>Foo</h1>", r#"<a class="header" href="bar.rs#foo" id="foo"><h1>Foo</h1></a>"#),
-            ("<h3>Foo^bar</h3>", r#"<a class="header" href="bar.rs#foobar" id="foobar"><h3>Foo^bar</h3></a>"#),
-            ("<h4></h4>", r#"<a class="header" href="bar.rs#" id=""><h4></h4></a>"#),
-            ("<h4><em>Hï</em></h4>", r#"<a class="header" href="bar.rs#hï" id="hï"><h4><em>Hï</em></h4></a>"#),
-            ("<h1>Foo</h1><h3>Foo</h3>", 
-                r#"<a class="header" href="bar.rs#foo" id="foo"><h1>Foo</h1></a><a class="header" href="bar.rs#foo-1" id="foo-1"><h3>Foo</h3></a>"#),
+            (
+                "blah blah <h1>Foo</h1>",
+                r##"blah blah <a class="header" href="./some_chapter/some_section.html#foo" id="foo"><h1>Foo</h1></a>"##,
+            ),
+            (
+                "<h1>Foo</h1>",
+                r##"<a class="header" href="./some_chapter/some_section.html#foo" id="foo"><h1>Foo</h1></a>"##,
+            ),
+            (
+                "<h3>Foo^bar</h3>",
+                r##"<a class="header" href="./some_chapter/some_section.html#foobar" id="foobar"><h3>Foo^bar</h3></a>"##,
+            ),
+            (
+                "<h4></h4>",
+                r##"<a class="header" href="./some_chapter/some_section.html#" id=""><h4></h4></a>"##
+            ),
+            (
+                "<h4><em>Hï</em></h4>",
+                r##"<a class="header" href="./some_chapter/some_section.html#hï" id="hï"><h4><em>Hï</em></h4></a>"##
+            ),
+            (
+                "<h1>Foo</h1><h3>Foo</h3>",
+                r##"<a class="header" href="./some_chapter/some_section.html#foo" id="foo"><h1>Foo</h1></a><a class="header" href="./some_chapter/some_section.html#foo-1" id="foo-1"><h3>Foo</h3></a>"##
+            ),
         ];
 
         for (src, should_be) in inputs {
-            let got = build_header_links(src, "bar.rs");
+            let filepath = "./some_chapter/some_section.html";
+            let got = build_header_links(&src, filepath);
+            assert_eq!(got, should_be);
+
+            // This is redundant for most cases
+            let got = fix_anchor_links(&got, filepath);
             assert_eq!(got, should_be);
         }
     }

tests/dummy/book/first/index.md

@@ -0,0 +1,5 @@
+# First Chapter
+
+more text.
+
+## Some Section

tests/dummy-book/first/nested.md → tests/dummy/book/first/nested.md

@@ -4,4 +4,6 @@ This file has some testable code.
 
 ```rust
 assert!($TEST_STATUS);
-```
+```
+
+## Some Section

tests/helpers.rs → tests/dummy/mod.rs

@@ -1,26 +1,23 @@
-//! Helpers for tests which exercise the overall application, in particular
-//! the `MDBook` initialization and build/rendering process.
-//!
 //! This will create an entire book in a temporary directory using some
 //! dummy contents from the `tests/dummy-book/` directory.
 
+// Not all features are used in all test crates, so...
+#![allow(dead_code, unused_extern_crates)]
 
-#![allow(dead_code, unused_variables, unused_imports)]
 extern crate tempdir;
 
-use std::path::Path;
-use std::fs::{self, File};
-use std::io::{Read, Write};
+use std::fs::{create_dir_all, File};
+use std::io::Write;
 
 use tempdir::TempDir;
 
 
-const SUMMARY_MD: &'static str = include_str!("dummy-book/SUMMARY.md");
-const INTRO: &'static str = include_str!("dummy-book/intro.md");
-const FIRST: &'static str = include_str!("dummy-book/first/index.md");
-const NESTED: &'static str = include_str!("dummy-book/first/nested.md");
-const SECOND: &'static str = include_str!("dummy-book/second.md");
-const CONCLUSION: &'static str = include_str!("dummy-book/conclusion.md");
+const SUMMARY_MD: &'static str = include_str!("book/SUMMARY.md");
+const INTRO: &'static str = include_str!("book/intro.md");
+const FIRST: &'static str = include_str!("book/first/index.md");
+const NESTED: &'static str = include_str!("book/first/nested.md");
+const SECOND: &'static str = include_str!("book/second.md");
+const CONCLUSION: &'static str = include_str!("book/conclusion.md");
 
 
 /// Create a dummy book in a temporary directory, using the contents of
@@ -58,10 +55,10 @@ impl DummyBook {
         let temp = TempDir::new("dummy_book").unwrap();
 
         let src = temp.path().join("src");
-        fs::create_dir_all(&src).unwrap();
+        create_dir_all(&src).unwrap();
 
         let first = src.join("first");
-        fs::create_dir_all(&first).unwrap();
+        create_dir_all(&first).unwrap();
 
         let to_substitute = if self.passing_test { "true" } else { "false" };
         let nested_text = NESTED.replace("$TEST_STATUS", to_substitute);
@@ -91,20 +88,3 @@ impl Default for DummyBook {
         DummyBook { passing_test: true }
     }
 }
-
-
-/// Read the contents of the provided file into memory and then iterate through
-/// the list of strings asserting that the file contains all of them.
-pub fn assert_contains_strings<P: AsRef<Path>>(filename: P, strings: &[&str]) {
-    let filename = filename.as_ref();
-
-    let mut content = String::new();
-    File::open(&filename)
-        .expect("Couldn't open the provided file")
-        .read_to_string(&mut content)
-        .expect("Couldn't read the file's contents");
-
-    for s in strings {
-        assert!(content.contains(s), "Searching for {:?} in {}\n\n{}", s, filename.display(), content);
-    }
-}

tests/helpers/mod.rs

@@ -0,0 +1,24 @@
+//! Helpers for tests which exercise the overall application, in particular
+//! the `MDBook` initialization and build/rendering process.
+
+
+use std::path::Path;
+use std::fs::File;
+use std::io::Read;
+
+
+/// Read the contents of the provided file into memory and then iterate through
+/// the list of strings asserting that the file contains all of them.
+pub fn assert_contains_strings<P: AsRef<Path>>(filename: P, strings: &[&str]) {
+    let filename = filename.as_ref();
+
+    let mut content = String::new();
+    File::open(&filename)
+        .expect("Couldn't open the provided file")
+        .read_to_string(&mut content)
+        .expect("Couldn't read the file's contents");
+
+    for s in strings {
+        assert!(content.contains(s), "Searching for {:?} in {}\n\n{}", s, filename.display(), content);
+    }
+}