Merge commit '4f3ab69ea0a0908260944443c739426cc384ae1a' into clippyup

[rust.git] / src / bootstrap / format.rs

diff --git a/src/bootstrap/format.rs b/src/bootstrap/format.rs
index 5e7264fe765a950ac9980b7ef55b5e05023312d6..b49322e3c028fc07d5eb1a54702a08d97d7e59be 100644 (file)
--- a/src/bootstrap/format.rs
+++ b/src/bootstrap/format.rs
@@ -1,14 +1,14 @@
 //! Runs rustfmt on the repository.
 
 use crate::builder::Builder;
-use crate::util::{output, t};
+use crate::util::{output, program_out_of_date, t};
 use ignore::WalkBuilder;
 use std::collections::VecDeque;
 use std::path::{Path, PathBuf};
 use std::process::{Command, Stdio};
 use std::sync::mpsc::SyncSender;
 
-fn rustfmt(src: &Path, rustfmt: &Path, paths: &[PathBuf], check: bool) -> impl FnMut() {
+fn rustfmt(src: &Path, rustfmt: &Path, paths: &[PathBuf], check: bool) -> impl FnMut(bool) -> bool {
     let mut cmd = Command::new(&rustfmt);
     // avoid the submodule config paths from coming into play,
     // we only allow a single global config for the workspace for now
@@ -23,7 +23,13 @@ fn rustfmt(src: &Path, rustfmt: &Path, paths: &[PathBuf], check: bool) -> impl F
     let cmd_debug = format!("{:?}", cmd);
     let mut cmd = cmd.spawn().expect("running rustfmt");
     // poor man's async: return a closure that'll wait for rustfmt's completion
-    move || {
+    move |block: bool| -> bool {
+        if !block {
+            match cmd.try_wait() {
+                Ok(Some(_)) => {}
+                _ => return false,
+            }
+        }
         let status = cmd.wait().unwrap();
         if !status.success() {
             eprintln!(
@@ -34,7 +40,92 @@ fn rustfmt(src: &Path, rustfmt: &Path, paths: &[PathBuf], check: bool) -> impl F
             );
             crate::detail_exit(1);
         }
+        true
+    }
+}
+
+fn get_rustfmt_version(build: &Builder<'_>) -> Option<(String, PathBuf)> {
+    let stamp_file = build.out.join("rustfmt.stamp");
+
+    let mut cmd = Command::new(match build.initial_rustfmt() {
+        Some(p) => p,
+        None => return None,
+    });
+    cmd.arg("--version");
+    let output = match cmd.output() {
+        Ok(status) => status,
+        Err(_) => return None,
+    };
+    if !output.status.success() {
+        return None;
+    }
+    Some((String::from_utf8(output.stdout).unwrap(), stamp_file))
+}
+
+/// Return whether the format cache can be reused.
+fn verify_rustfmt_version(build: &Builder<'_>) -> bool {
+    let Some((version, stamp_file)) = get_rustfmt_version(build) else {return false;};
+    !program_out_of_date(&stamp_file, &version)
+}
+
+/// Updates the last rustfmt version used
+fn update_rustfmt_version(build: &Builder<'_>) {
+    let Some((version, stamp_file)) = get_rustfmt_version(build) else {return;};
+    t!(std::fs::write(stamp_file, version))
+}
+
+/// Returns the files modified between the `merge-base` of HEAD and
+/// rust-lang/master and what is now on the disk.
+///
+/// Returns `None` if all files should be formatted.
+fn get_modified_files(build: &Builder<'_>) -> Option<Vec<String>> {
+    let Ok(remote) = get_rust_lang_rust_remote() else {return None;};
+    if !verify_rustfmt_version(build) {
+        return None;
     }
+    Some(
+        output(
+            build
+                .config
+                .git()
+                .arg("diff-index")
+                .arg("--name-only")
+                .arg("--merge-base")
+                .arg(&format!("{remote}/master")),
+        )
+        .lines()
+        .map(|s| s.trim().to_owned())
+        .collect(),
+    )
+}
+
+/// Finds the remote for rust-lang/rust.
+/// For example for these remotes it will return `upstream`.
+/// ```text
+/// origin  https://github.com/Nilstrieb/rust.git (fetch)
+/// origin  https://github.com/Nilstrieb/rust.git (push)
+/// upstream        https://github.com/rust-lang/rust (fetch)
+/// upstream        https://github.com/rust-lang/rust (push)
+/// ```
+fn get_rust_lang_rust_remote() -> Result<String, String> {
+    let mut git = Command::new("git");
+    git.args(["config", "--local", "--get-regex", "remote\\..*\\.url"]);
+
+    let output = git.output().map_err(|err| format!("{err:?}"))?;
+    if !output.status.success() {
+        return Err("failed to execute git config command".to_owned());
+    }
+
+    let stdout = String::from_utf8(output.stdout).map_err(|err| format!("{err:?}"))?;
+
+    let rust_lang_remote = stdout
+        .lines()
+        .find(|remote| remote.contains("rust-lang"))
+        .ok_or_else(|| "rust-lang/rust remote not found".to_owned())?;
+
+    let remote_name =
+        rust_lang_remote.split('.').nth(1).ok_or_else(|| "remote name not found".to_owned())?;
+    Ok(remote_name.into())
 }
 
 #[derive(serde::Deserialize)]
@@ -103,6 +194,14 @@ pub fn format(build: &Builder<'_>, check: bool, paths: &[PathBuf]) {
                 // preventing the latter from being formatted.
                 ignore_fmt.add(&format!("!/{}", untracked_path)).expect(&untracked_path);
             }
+            if !check && paths.is_empty() {
+                if let Some(files) = get_modified_files(build) {
+                    for file in files {
+                        println!("formatting modified file {file}");
+                        ignore_fmt.add(&format!("/{file}")).expect(&file);
+                    }
+                }
+            }
         } else {
             println!("Not in git tree. Skipping git-aware format checks");
         }
@@ -146,15 +245,23 @@ pub fn format(build: &Builder<'_>, check: bool, paths: &[PathBuf]) {
             let child = rustfmt(&src, &rustfmt_path, paths.as_slice(), check);
             children.push_back(child);
 
+            // poll completion before waiting
+            for i in (0..children.len()).rev() {
+                if children[i](false) {
+                    children.swap_remove_back(i);
+                    break;
+                }
+            }
+
             if children.len() >= max_processes {
                 // await oldest child
-                children.pop_front().unwrap()();
+                children.pop_front().unwrap()(true);
             }
         }
 
         // await remaining children
         for mut child in children {
-            child();
+            child(true);
         }
     });
 
@@ -172,4 +279,7 @@ pub fn format(build: &Builder<'_>, check: bool, paths: &[PathBuf]) {
     drop(tx);
 
     thread.join().unwrap();
+    if !check {
+        update_rustfmt_version(build);
+    }
 }