Update dependencies and refactor mdbook-toc into a preprocessor

Cargo.toml

@@ -4,9 +4,10 @@ version = "0.1.0"
 authors = ["Jan-Erik Rediger <janerik@fnordig.de>"]
 
 [dependencies]
-mdbook = { git = "https://github.com/badboy/mdBook", branch = "fix-section-numbering" }
-pulldown-cmark = "0.1.2"
-pulldown-cmark-to-cmark = "1.1.0"
-env_logger = "0.5.10"
-log = "0.4.3"
-clap = "2.32.0"
+mdbook = "0.3.0"
+pulldown-cmark = "0.5"
+pulldown-cmark-to-cmark = "1.2"
+env_logger = "0.6"
+log = "0.4"
+clap = "2.33"
+serde_json = "1.0"

src/bin/mdbook-toc.rs

@@ -0,0 +1,64 @@
+extern crate clap;
+extern crate mdbook;
+extern crate mdbook_toc;
+extern crate serde_json;
+
+use clap::{App, Arg, ArgMatches, SubCommand};
+use mdbook::errors::Error;
+use mdbook::preprocess::{CmdPreprocessor, Preprocessor};
+use mdbook_toc::Toc;
+
+use std::io;
+use std::process;
+
+pub fn make_app() -> App<'static, 'static> {
+    App::new("mdbook-toc")
+        .about("mdbook preprocessor to Table of Contents")
+        .subcommand(
+            SubCommand::with_name("supports")
+                .arg(Arg::with_name("renderer").required(true))
+                .about("Check whether a renderer is supported by this preprocessor"))
+}
+
+fn main() {
+    let matches = make_app().get_matches();
+
+    if let Some(sub_args) = matches.subcommand_matches("supports") {
+        handle_supports(sub_args);
+    } else {
+        if let Err(e) = handle_preprocessing() {
+            eprintln!("{}", e);
+            process::exit(1);
+        }
+    }
+}
+
+fn handle_preprocessing() -> Result<(), Error> {
+    let (ctx, book) = CmdPreprocessor::parse_input(io::stdin())?;
+
+    if ctx.mdbook_version != mdbook::MDBOOK_VERSION {
+        eprintln!(
+            "Warning: The mdbook-toc preprocessor was built against version \
+             {} of mdbook, but we're being called from version {}",
+            mdbook::MDBOOK_VERSION,
+            ctx.mdbook_version
+        );
+    }
+
+    let processed_book = Toc.run(&ctx, book)?;
+    serde_json::to_writer(io::stdout(), &processed_book)?;
+
+    Ok(())
+}
+
+fn handle_supports(sub_args: &ArgMatches) -> ! {
+    let renderer = sub_args.value_of("renderer").expect("Required argument");
+    let supported = Toc.supports_renderer(&renderer);
+
+    // Signal whether the renderer is supported by exiting with 1 or 0.
+    if supported {
+        process::exit(0);
+    } else {
+        process::exit(1);
+    }
+}

src/main.rs

@@ -1,64 +0,0 @@
-extern crate env_logger;
-extern crate mdbook;
-extern crate mdbook_toc;
-extern crate clap;
-
-use mdbook::MDBook;
-use mdbook::errors::Result;
-use mdbook_toc::Toc;
-use clap::{App, ArgMatches};
-
-use std::env;
-use std::process;
-use std::path::{Path, PathBuf};
-
-fn get_book_dir(args: &ArgMatches) -> PathBuf {
-    if let Some(dir) = args.value_of("dir") {
-        // Check if path is relative from current dir, or absolute...
-        let p = Path::new(dir);
-        if p.is_relative() {
-            env::current_dir().unwrap().join(dir)
-        } else {
-            p.to_path_buf()
-        }
-    } else {
-        env::current_dir().expect("Unable to determine the current directory")
-    }
-}
-
-pub fn make_app<'a, 'b>() -> App<'a, 'b> {
-    App::new("mdbook-toc")
-        .about("Build the book from the markdown files with ToC support")
-        .arg_from_usage(
-            "-d, --dest-dir=[dest-dir] 'The output directory for your book{n}(Defaults to ./book \
-             when omitted)'",
-        )
-        .arg_from_usage(
-            "[dir] 'A directory for your book{n}(Defaults to Current Directory when omitted)'",
-        )
-}
-
-pub fn execute(args: &ArgMatches) -> Result<()> {
-    let book_dir = get_book_dir(args);
-    let mut book = MDBook::load(&book_dir)?;
-
-    if let Some(dest_dir) = args.value_of("dest-dir") {
-        book.config.build.build_dir = PathBuf::from(dest_dir);
-    }
-
-    book.with_preprecessor(Toc);
-    book.build()?;
-
-    Ok(())
-}
-
-fn main() {
-    env_logger::init();
-    let app = make_app();
-    let matches = app.get_matches();
-
-    if let Err(e) = execute(&matches) {
-        eprintln!("{}", e);
-        process::exit(1);
-    }
-}