Auto merge of #44636 - GuillaumeGomez:little-error-msg, r=michaelwoerister

Add short error message-format

Fixes #42653.

Author: bors

src/librustc/session/config.rs

@@ -156,6 +156,7 @@ impl OutputType {
 pub enum ErrorOutputType {
     HumanReadable(ColorConfig),
     Json,
+    Short(ColorConfig),
 }
 
 impl Default for ErrorOutputType {
@@ -1362,7 +1363,7 @@ pub fn rustc_optgroups() -> Vec<RustcOptGroup> {
         opt::multi("Z", "", "Set internal debugging options", "FLAG"),
         opt::opt_s("", "error-format",
                       "How errors and other messages are produced",
-                      "human|json"),
+                      "human|json|short"),
         opt::opt_s("", "color", "Configure coloring of output:
                                  auto   = colorize, if output goes to a tty (default);
                                  always = always colorize output;
@@ -1429,15 +1430,16 @@ pub fn build_session_options_and_crate_config(matches: &getopts::Matches)
     // opt_present because the latter will panic.
     let error_format = if matches.opts_present(&["error-format".to_owned()]) {
         match matches.opt_str("error-format").as_ref().map(|s| &s[..]) {
-            Some("human")   => ErrorOutputType::HumanReadable(color),
-            Some("json") => ErrorOutputType::Json,
+            Some("human") => ErrorOutputType::HumanReadable(color),
+            Some("json")  => ErrorOutputType::Json,
+            Some("short") => ErrorOutputType::Short(color),
 
             None => ErrorOutputType::HumanReadable(color),
 
             Some(arg) => {
                 early_error(ErrorOutputType::HumanReadable(color),
-                            &format!("argument for --error-format must be human or json (instead \
-                                      was `{}`)",
+                            &format!("argument for --error-format must be `human`, `json` or \
+                                      `short` (instead was `{}`)",
                                      arg))
             }
         }

src/librustc/session/mod.rs

@@ -715,19 +715,23 @@ pub fn build_session_with_codemap(sopts: config::Options,
 
     let emitter: Box<Emitter> = match (sopts.error_format, emitter_dest) {
         (config::ErrorOutputType::HumanReadable(color_config), None) => {
-            Box::new(EmitterWriter::stderr(color_config,
-                                           Some(codemap.clone())))
+            Box::new(EmitterWriter::stderr(color_config, Some(codemap.clone()), false))
         }
         (config::ErrorOutputType::HumanReadable(_), Some(dst)) => {
-            Box::new(EmitterWriter::new(dst,
-                                        Some(codemap.clone())))
+            Box::new(EmitterWriter::new(dst, Some(codemap.clone()), false))
         }
         (config::ErrorOutputType::Json, None) => {
             Box::new(JsonEmitter::stderr(Some(registry), codemap.clone()))
         }
         (config::ErrorOutputType::Json, Some(dst)) => {
             Box::new(JsonEmitter::new(dst, Some(registry), codemap.clone()))
         }
+        (config::ErrorOutputType::Short(color_config), None) => {
+            Box::new(EmitterWriter::stderr(color_config, Some(codemap.clone()), true))
+        }
+        (config::ErrorOutputType::Short(_), Some(dst)) => {
+            Box::new(EmitterWriter::new(dst, Some(codemap.clone()), true))
+        }
     };
 
     let diagnostic_handler =
@@ -891,10 +895,12 @@ pub enum IncrCompSession {
 pub fn early_error(output: config::ErrorOutputType, msg: &str) -> ! {
     let emitter: Box<Emitter> = match output {
         config::ErrorOutputType::HumanReadable(color_config) => {
-            Box::new(EmitterWriter::stderr(color_config,
-                                           None))
+            Box::new(EmitterWriter::stderr(color_config, None, false))
         }
         config::ErrorOutputType::Json => Box::new(JsonEmitter::basic()),
+        config::ErrorOutputType::Short(color_config) => {
+            Box::new(EmitterWriter::stderr(color_config, None, true))
+        }
     };
     let handler = errors::Handler::with_emitter(true, false, emitter);
     handler.emit(&MultiSpan::new(), msg, errors::Level::Fatal);
@@ -904,10 +910,12 @@ pub fn early_error(output: config::ErrorOutputType, msg: &str) -> ! {
 pub fn early_warn(output: config::ErrorOutputType, msg: &str) {
     let emitter: Box<Emitter> = match output {
         config::ErrorOutputType::HumanReadable(color_config) => {
-            Box::new(EmitterWriter::stderr(color_config,
-                                           None))
+            Box::new(EmitterWriter::stderr(color_config, None, false))
         }
         config::ErrorOutputType::Json => Box::new(JsonEmitter::basic()),
+        config::ErrorOutputType::Short(color_config) => {
+            Box::new(EmitterWriter::stderr(color_config, None, true))
+        }
     };
     let handler = errors::Handler::with_emitter(true, false, emitter);
     handler.emit(&MultiSpan::new(), msg, errors::Level::Warning);

src/librustc_driver/lib.rs

@@ -138,7 +138,9 @@ pub fn run<F>(run_compiler: F) -> isize
                 }
                 None => {
                     let emitter =
-                        errors::emitter::EmitterWriter::stderr(errors::ColorConfig::Auto, None);
+                        errors::emitter::EmitterWriter::stderr(errors::ColorConfig::Auto,
+                                                               None,
+                                                               true);
                     let handler = errors::Handler::with_emitter(true, false, Box::new(emitter));
                     handler.emit(&MultiSpan::new(),
                                  "aborting due to previous error(s)",
@@ -1208,7 +1210,9 @@ pub fn monitor<F: FnOnce() + Send + 'static>(f: F) {
         // Thread panicked without emitting a fatal diagnostic
         if !value.is::<errors::FatalError>() {
             let emitter =
-                Box::new(errors::emitter::EmitterWriter::stderr(errors::ColorConfig::Auto, None));
+                Box::new(errors::emitter::EmitterWriter::stderr(errors::ColorConfig::Auto,
+                                                                None,
+                                                                false));
             let handler = errors::Handler::with_emitter(true, false, emitter);
 
             // a .span_bug or .bug call has already printed what