Auto merge of rust-lang#10747 - Alexendoo:cargo-dev-dogfood-stdout, r=flip1995

Inherit stdout/stderr for `cargo dev dogfood`

changelog: none

Prints progress as it happens and in colour, and will also show anything printed to stderr

Author: bors

clippy_dev/src/dogfood.rs

@@ -1,4 +1,4 @@
-use crate::clippy_project_root;
+use crate::{clippy_project_root, exit_if_err};
 use std::process::Command;
 
 /// # Panics
@@ -10,7 +10,7 @@ pub fn dogfood(fix: bool, allow_dirty: bool, allow_staged: bool) {
     cmd.current_dir(clippy_project_root())
         .args(["test", "--test", "dogfood"])
         .args(["--features", "internal"])
-        .args(["--", "dogfood_clippy"]);
+        .args(["--", "dogfood_clippy", "--nocapture"]);
 
     let mut dogfood_args = Vec::new();
     if fix {
@@ -27,7 +27,5 @@ pub fn dogfood(fix: bool, allow_dirty: bool, allow_staged: bool) {
 
     cmd.env("__CLIPPY_DOGFOOD_ARGS", dogfood_args.join(" "));
 
-    let output = cmd.output().expect("failed to run command");
-
-    println!("{}", String::from_utf8_lossy(&output.stdout));
+    exit_if_err(cmd.status());
 }

clippy_dev/src/lib.rs

@@ -10,7 +10,9 @@
 extern crate rustc_driver;
 extern crate rustc_lexer;
 
+use std::io;
 use std::path::PathBuf;
+use std::process::{self, ExitStatus};
 
 pub mod bless;
 pub mod dogfood;
@@ -58,3 +60,14 @@ pub fn clippy_project_root() -> PathBuf {
     }
     panic!("error: Can't determine root of project. Please run inside a Clippy working dir.");
 }
+
+pub fn exit_if_err(status: io::Result<ExitStatus>) {
+    match status.expect("failed to run command").code() {
+        Some(0) => {},
+        Some(n) => process::exit(n),
+        None => {
+            eprintln!("Killed by signal");
+            process::exit(1);
+        },
+    }
+}

clippy_dev/src/lint.rs

@@ -1,17 +1,6 @@
-use crate::cargo_clippy_path;
-use std::process::{self, Command, ExitStatus};
-use std::{fs, io};
-
-fn exit_if_err(status: io::Result<ExitStatus>) {
-    match status.expect("failed to run command").code() {
-        Some(0) => {},
-        Some(n) => process::exit(n),
-        None => {
-            eprintln!("Killed by signal");
-            process::exit(1);
-        },
-    }
-}
+use crate::{cargo_clippy_path, exit_if_err};
+use std::fs;
+use std::process::{self, Command};
 
 pub fn run<'a>(path: &str, args: impl Iterator<Item = &'a String>) {
     let is_file = match fs::metadata(path) {