From ebcf41c25b9c9e3afa6e95ddc49b2c652a979d3c Mon Sep 17 00:00:00 2001
From: Michael Bryan <michaelfbryan@gmail.com>
Date: Mon, 11 Dec 2017 11:42:36 +1100
Subject: [PATCH] Improved error messages using
 error_chain::ChainedError::display_chain()

---
 src/bin/mdbook.rs | 6 ++++--
 src/book/mod.rs   | 7 +++++++
 2 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/src/bin/mdbook.rs b/src/bin/mdbook.rs
index 53de436c..4d7fbd6b 100644
--- a/src/bin/mdbook.rs
+++ b/src/bin/mdbook.rs
@@ -1,17 +1,18 @@
 #[macro_use]
 extern crate clap;
 extern crate env_logger;
+extern crate error_chain;
 extern crate log;
 extern crate mdbook;
 extern crate open;
 
 use std::env;
 use std::ffi::OsStr;
-use std::io::{self, Write};
 use std::path::{Path, PathBuf};
 use clap::{App, AppSettings, ArgMatches};
 use log::{LogLevelFilter, LogRecord};
 use env_logger::LogBuilder;
+use error_chain::ChainedError;
 
 pub mod build;
 pub mod init;
@@ -59,7 +60,8 @@ fn main() {
     };
 
     if let Err(e) = res {
-        writeln!(&mut io::stderr(), "An error occured:\n{}", e).ok();
+        eprintln!("{}", e.display_chain());
+
         ::std::process::exit(101);
     }
 }
diff --git a/src/book/mod.rs b/src/book/mod.rs
index 5116e175..941682ee 100644
--- a/src/book/mod.rs
+++ b/src/book/mod.rs
@@ -48,11 +48,18 @@ impl MDBook {
         let config_location = book_root.join("book.toml");
 
         let config = if config_location.exists() {
+            debug!("[*] Loading config from {}", config_location.display());
             Config::from_disk(&config_location)?
         } else {
             Config::default()
         };
 
+        if log_enabled!(::log::LogLevel::Trace) {
+            for line in format!("Config: {:#?}", config).lines() {
+                trace!("{}", line);
+            }
+        }
+
         MDBook::load_with_config(book_root, config)
     }