Better shelf_url backreference setup

src/cmd/shelf.rs

@@ -26,18 +26,20 @@ fn process_book(
     index_file: &mut File,
     summary: &mut File,
     shelf_source: &PathBuf,
+    shelf_url: &PathBuf,
 ) -> Result<()> {
     let book_dir = path.try_resolve()?;
     let book_dir = std::fs::canonicalize(book_dir)?;
     let mut book = MDBook::load(book_dir)?;
 
     // Build book
-    let mut path = current_dir()?;
     let title = book.config.book.title.clone().unwrap();
+    let mut path = current_dir()?;
     path.push(BOOKS_DIR);
     path.push(title);
     book.config.build.build_dir = path;
-    book.config.book.shelf_url = Some(PathBuf::from(r"../../shelf/book/index.html"));
+    // Create back reference to bookshelf
+    book.config.book.shelf_url = Some(shelf_url.to_path_buf());
     book.build()?;
 
     // Create post in index file
@@ -77,6 +79,7 @@ pub fn execute(_args: &ArgMatches) -> Result<()> {
     let _ = std::fs::remove_dir_all(REPOS_DIR);
     let shelf_book = MDBook::init(SHELF_DIR).create_gitignore(false).build()?;
     let shelf_source = shelf_book.source_dir();
+    let shelf_url = PathBuf::from(format!("../../{SHELF_DIR}/book/{INDEX_HTML_FILE}"));
 
     let mut index_file_name = shelf_book.source_dir();
     index_file_name.push(INDEX_MD_FILE);
@@ -145,9 +148,16 @@ pub fn execute(_args: &ArgMatches) -> Result<()> {
                 &mut index_file,
                 &mut summary,
                 &shelf_source,
+                &shelf_url,
             )?
         } else if let Some(path) = &sb.path {
-            process_book(path, &mut index_file, &mut summary, &shelf_source)?
+            process_book(
+                path,
+                &mut index_file,
+                &mut summary,
+                &shelf_source,
+                &shelf_url,
+            )?
         } else {
             warn!("Neither path or git specified. Invalid book");
         }