Add support for --library-path to rustbook test

This makes it possible to test an mdbook which has dependencies other
than the direct crate for the book itself, e.g. the `trpl` crate used in
_The Rust Programming Language_.

src/tools/rustbook/src/main.rs

@@ -1,9 +1,9 @@
 use std::env;
 use std::path::{Path, PathBuf};
 
-use clap::{ArgMatches, Command, arg, crate_version};
-use mdbook::MDBook;
+use clap::{arg, crate_version, ArgMatches, Command};
 use mdbook::errors::Result as Result3;
+use mdbook::MDBook;
 use mdbook_i18n_helpers::preprocessors::Gettext;
 use mdbook_spec::Spec;
 use mdbook_trpl_listing::TrplListing;
@@ -26,6 +26,20 @@ fn main() {
                               (Defaults to the current directory when omitted)")
     .value_parser(clap::value_parser!(PathBuf));
 
+    // Note: we don't parse this into a `PathBuf` because it is comma separated
+    // strings *and* we will ultimately pass it into `MDBook::test()`, which
+    // accepts `Vec<&str>`. Although it is a bit annoying that `-l/--lang` and
+    // `-L/--library-path` are so close, this is the same set of arguments we
+    // would pass when invoking mdbook on the CLI, so making them match when
+    // invoking rustbook makes for good consistency.
+    let library_path_arg = arg!(
+        -L --"library-path"
+        "A comma-separated list of directories to add to the crate search\n\
+        path when building tests"
+    )
+    .required(false)
+    .value_parser(parse_library_paths);
+
     let matches = Command::new("rustbook")
         .about("Build a book with mdBook")
         .author("Steve Klabnik <steve@steveklabnik.com>")
@@ -42,7 +56,8 @@ fn main() {
         .subcommand(
             Command::new("test")
                 .about("Tests that a book's Rust code samples compile")
-                .arg(dir_arg),
+                .arg(dir_arg)
+                .arg(library_path_arg),
         )
         .get_matches();
 
@@ -106,14 +121,22 @@ pub fn build(args: &ArgMatches) -> Result3<()> {
 
 fn test(args: &ArgMatches) -> Result3<()> {
     let book_dir = get_book_dir(args);
+    let library_paths = args
+        .try_get_one::<Vec<String>>("library_path")?
+        .map(|v| v.iter().map(|s| s.as_str()).collect::<Vec<&str>>())
+        .unwrap_or_default();
     let mut book = load_book(&book_dir)?;
-    book.test(vec![])
+    book.test(library_paths)
 }
 
 fn get_book_dir(args: &ArgMatches) -> PathBuf {
     if let Some(p) = args.get_one::<PathBuf>("dir") {
         // Check if path is relative from current dir, or absolute...
-        if p.is_relative() { env::current_dir().unwrap().join(p) } else { p.to_path_buf() }
+        if p.is_relative() {
+            env::current_dir().unwrap().join(p)
+        } else {
+            p.to_path_buf()
+        }
     } else {
         env::current_dir().unwrap()
     }
@@ -125,12 +148,16 @@ fn load_book(book_dir: &Path) -> Result3<MDBook> {
     Ok(book)
 }
 
+fn parse_library_paths(input: &str) -> Result<Vec<String>, String> {
+    Ok(input.split(",").map(String::from).collect())
+}
+
 fn handle_error(error: mdbook::errors::Error) -> ! {
     eprintln!("Error: {}", error);
 
     for cause in error.chain().skip(1) {
         eprintln!("\tCaused By: {}", cause);
     }
 
-    ::std::process::exit(101);
+    std::process::exit(101);
 }