Update to yansi 0.3 for proper Debug formatting.

This commit also improves the format of TOML parsing error messages.

Fixes #310.

codegen/Cargo.toml

@@ -22,5 +22,5 @@ log = "0.3"
 compiletest_rs = "0.2"
 
 [build-dependencies]
-yansi = "0.2"
+yansi = "0.3"
 version_check = "0.1.2"

lib/Cargo.toml

@@ -18,7 +18,7 @@ categories = ["web-programming::http-server"]
 tls = ["rustls", "hyper-rustls"]
 
 [dependencies]
-yansi = "0.2"
+yansi = "0.3"
 log = "0.3"
 url = "1"
 toml = { version = "0.2", default-features = false }
@@ -47,5 +47,5 @@ lazy_static = "0.2"
 rocket_codegen = { version = "0.2.8", path = "../codegen" }
 
 [build-dependencies]
-yansi = "0.2"
+yansi = "0.3"
 version_check = "0.1.2"

lib/src/config/error.rs

@@ -93,9 +93,9 @@ impl ConfigError {
                     let (line, col) = error.start;
                     let error_source = &source[lo..hi];
 
-                    error!("config file could not be parsed as TOML");
+                    error!("config file failed to parse due to invalid TOML");
                     info_!("at {:?}:{}:{}", White.paint(filename), line + 1, col + 1);
-                    trace_!("'{}' - {}", error_source, White.paint(&error.desc));
+                    trace_!("{:?} - {}", error_source, White.paint(&error.desc));
                 }
             }
             BadEnvVal(ref key, ref value, ref error) => {

lib/src/config/mod.rs

@@ -399,11 +399,18 @@ impl RocketConfig {
         let toml = parser.parse().ok_or_else(|| {
             let source = src.clone();
             let errors = parser.errors.iter()
-                .map(|error| ParsingError {
-                    byte_range: (error.lo, error.hi),
-                    start: parser.to_linecol(error.lo),
-                    end: parser.to_linecol(error.hi),
-                    desc: error.desc.clone(),
+                .map(|error| {
+                    // workaround for poor error messages `toml`
+                    let debug_desc = format!("{:?}", error.desc);
+                    // strip the leading " and trailing " from debug formatting
+                    let desc = debug_desc[1..debug_desc.len() - 1].to_string();
+
+                    ParsingError {
+                        byte_range: (error.lo, error.hi),
+                        start: parser.to_linecol(error.lo),
+                        end: parser.to_linecol(error.hi),
+                        desc: desc
+                    }
                 });
 
             ConfigError::ParseError(source, path.clone(), errors.collect())