[F] Fix logging

src/logging.rs

@@ -1,40 +1,26 @@
 use std::cell::RefCell;
 use std::fmt;
-use std::io::{self, IsTerminal, Write};
-use std::sync::{Mutex, OnceLock};
+use std::io::{self, Write};
+use std::sync::{Arc, Mutex, OnceLock};
 
-use console::style;
-
-static OUTPUT: OnceLock<Mutex<OutputState>> = OnceLock::new();
+static OUTPUT: OnceLock<Mutex<()>> = OnceLock::new();
 
 thread_local! {
-    static REPO_LOG: RefCell<Option<RepoLog>> = const { RefCell::new(None) };
+    static REPO_LOG: RefCell<Option<ActiveRepoLog>> = const { RefCell::new(None) };
 }
 
-#[derive(Default)]
-struct OutputState {
-    status: Option<StatusState>,
+#[derive(Clone)]
+pub(crate) struct RepoLogContext {
+    inner: Arc<RepoLog>,
 }
 
-struct StatusState {
-    slots: Vec<Option<String>>,
-    visible: bool,
-    interactive: bool,
+struct ActiveRepoLog {
+    context: RepoLogContext,
+    owner: bool,
 }
 
 struct RepoLog {
-    repo_name: String,
-    slot: usize,
-    width: usize,
-    lines: Vec<String>,
-}
-
-pub struct StatusGuard;
-
-impl Drop for StatusGuard {
-    fn drop(&mut self) {
-        finish_status_area();
-    }
+    lines: Mutex<Vec<String>>,
 }
 
 pub struct RepoLogGuard;
@@ -45,180 +31,119 @@ impl Drop for RepoLogGuard {
     }
 }
 
-pub fn start_status_area(slots: usize) -> StatusGuard {
-    with_output(|output| {
-        if let Some(status) = output.status.as_mut() {
-            clear_status(status);
-        }
-        output.status = Some(StatusState {
-            slots: vec![None; slots],
-            visible: false,
-            interactive: io::stdout().is_terminal() && slots > 0,
-        });
-        if let Some(status) = output.status.as_mut() {
-            draw_status(status);
-        }
-    });
-    StatusGuard
-}
-
-pub fn start_repo_log(repo_name: String, slot: usize, width: usize) -> RepoLogGuard {
+pub fn start_repo_log() -> RepoLogGuard {
+    let context = RepoLogContext {
+        inner: Arc::new(RepoLog {
+            lines: Mutex::new(Vec::new()),
+        }),
+    };
     REPO_LOG.with(|repo_log| {
-        *repo_log.borrow_mut() = Some(RepoLog {
-            repo_name,
-            slot,
-            width,
-            lines: Vec::new(),
+        *repo_log.borrow_mut() = Some(ActiveRepoLog {
+            context,
+            owner: true,
         });
     });
     RepoLogGuard
 }
 
-pub fn finish_repo_log() {
-    let repo_log = REPO_LOG.with(|repo_log| repo_log.borrow_mut().take());
-    let Some(repo_log) = repo_log else {
-        return;
-    };
-
-    with_output(|output| {
-        if let Some(status) = output.status.as_mut() {
-            clear_status(status);
-            if repo_log.slot < status.slots.len() {
-                status.slots[repo_log.slot] = None;
-            }
-        }
-        for line in repo_log.lines {
-            println!("{line}");
-        }
-        if let Some(status) = output.status.as_mut() {
-            draw_status(status);
-        }
-    });
+pub(crate) fn current_repo_log_context() -> Option<RepoLogContext> {
+    REPO_LOG.with(|repo_log| {
+        repo_log
+            .borrow()
+            .as_ref()
+            .map(|repo_log| repo_log.context.clone())
+    })
 }
 
-pub fn repo_prefix(repo_name: &str, width: usize) -> String {
-    let mut prefix = repo_name.chars().take(width).collect::<String>();
-    if repo_name.chars().count() > width && width > 0 {
-        prefix.pop();
-        prefix.push('~');
+pub(crate) fn inherit_repo_log(context: Option<RepoLogContext>) -> InheritedRepoLogGuard {
+    let previous = REPO_LOG.with(|repo_log| {
+        let mut repo_log = repo_log.borrow_mut();
+        let previous = repo_log.take();
+        if let Some(context) = context {
+            *repo_log = Some(ActiveRepoLog {
+                context,
+                owner: false,
+            });
+        }
+        previous
+    });
+    InheritedRepoLogGuard { previous }
+}
+
+pub(crate) struct InheritedRepoLogGuard {
+    previous: Option<ActiveRepoLog>,
+}
+
+impl Drop for InheritedRepoLogGuard {
+    fn drop(&mut self) {
+        REPO_LOG.with(|repo_log| {
+            *repo_log.borrow_mut() = self.previous.take();
+        });
     }
-    format!("{prefix:<width$}")
+}
+
+pub fn finish_repo_log() {
+    let active = REPO_LOG.with(|repo_log| repo_log.borrow_mut().take());
+    let Some(active) = active else {
+        return;
+    };
+    if !active.owner {
+        return;
+    }
+
+    let repo_log = active.context.inner;
+    let lines = {
+        let mut lines = repo_log
+            .lines
+            .lock()
+            .unwrap_or_else(|poisoned| poisoned.into_inner());
+        std::mem::take(&mut *lines)
+    };
+
+    with_output(|| {
+        for line in lines {
+            println!("{line}");
+        }
+    });
 }
 
 pub fn line(args: fmt::Arguments<'_>) {
     let text = args.to_string();
-    let captured = REPO_LOG.with(|repo_log| {
-        let mut repo_log = repo_log.borrow_mut();
-        let Some(repo_log) = repo_log.as_mut() else {
-            return false;
-        };
-
-        if text.is_empty() {
-            repo_log.lines.push(String::new());
-            return true;
-        }
-
-        for line in text.lines() {
-            repo_log.lines.push(line.to_string());
-            if !line.trim().is_empty() {
-                update_status(repo_log, line.trim());
-            }
-        }
-        true
-    });
-
-    if captured {
+    let context = current_repo_log_context();
+    if let Some(context) = context {
+        capture_repo_line(&context, &text);
         return;
     }
 
-    with_output(|output| {
-        if let Some(status) = output.status.as_mut() {
-            clear_status(status);
-        }
+    with_output(|| {
         println!("{text}");
-        if let Some(status) = output.status.as_mut() {
-            draw_status(status);
-        }
     });
 }
 
-fn update_status(repo_log: &RepoLog, line: &str) {
-    let repo = repo_prefix(&repo_log.repo_name, repo_log.width);
-    let line = truncate_status(line, 96);
-    with_output(|output| {
-        let Some(status) = output.status.as_mut() else {
-            return;
-        };
-        if repo_log.slot >= status.slots.len() {
-            return;
-        }
-        clear_status(status);
-        status.slots[repo_log.slot] = Some(format!(
-            "{} {} {}",
-            style(format!("worker {}", repo_log.slot + 1)).dim(),
-            style(repo).cyan().bold(),
-            line
-        ));
-        draw_status(status);
-    });
-}
-
-fn truncate_status(value: &str, max_chars: usize) -> String {
-    if value.chars().count() <= max_chars {
-        return value.to_string();
-    }
-    let mut output = value.chars().take(max_chars).collect::<String>();
-    output.pop();
-    output.push('~');
-    output
-}
-
-fn finish_status_area() {
-    with_output(|output| {
-        if let Some(status) = output.status.as_mut() {
-            clear_status(status);
-        }
-        output.status = None;
-    });
-}
-
-fn with_output(action: impl FnOnce(&mut OutputState)) {
-    let output = OUTPUT.get_or_init(|| Mutex::new(OutputState::default()));
-    let mut output = output
+fn capture_repo_line(context: &RepoLogContext, text: &str) {
+    let mut lines = context
+        .inner
+        .lines
         .lock()
         .unwrap_or_else(|poisoned| poisoned.into_inner());
-    action(&mut output);
+    if text.is_empty() {
+        lines.push(String::new());
+        return;
+    }
+    for line in text.lines() {
+        lines.push(line.to_string());
+    }
+}
+
+fn with_output(action: impl FnOnce()) {
+    let output = OUTPUT.get_or_init(|| Mutex::new(()));
+    let _output = output
+        .lock()
+        .unwrap_or_else(|poisoned| poisoned.into_inner());
+    action();
     let _ = io::stdout().flush();
 }
 
-fn clear_status(status: &mut StatusState) {
-    if !status.interactive || !status.visible {
-        return;
-    }
-
-    let lines = status.slots.len();
-    print!("\x1b[{lines}A\r");
-    for _ in 0..lines {
-        println!("\x1b[2K");
-    }
-    print!("\x1b[{lines}A\r");
-    status.visible = false;
-}
-
-fn draw_status(status: &mut StatusState) {
-    if !status.interactive {
-        return;
-    }
-
-    for slot in &status.slots {
-        match slot {
-            Some(line) => println!("{line}"),
-            None => println!("{}", style("idle").dim()),
-        }
-    }
-    status.visible = true;
-}
-
 #[macro_export]
 macro_rules! logln {
     () => {

src/parallel.rs

@@ -20,13 +20,16 @@ where
     let worker_count = jobs.min(items.len());
     let queue = Arc::new(Mutex::new(VecDeque::from(items)));
     let (sender, receiver) = mpsc::channel();
+    let repo_log_context = crate::logging::current_repo_log_context();
 
     thread::scope(|scope| {
         for _ in 0..worker_count {
             let queue = Arc::clone(&queue);
             let sender = sender.clone();
             let f = &f;
+            let repo_log_context = repo_log_context.clone();
             scope.spawn(move || {
+                let _repo_log_guard = crate::logging::inherit_repo_log(repo_log_context);
                 while let Some(item) = pop_item(&queue) {
                     if sender.send(f(item)).is_err() {
                         break;

src/sync.rs

@@ -237,7 +237,6 @@ fn sync_group(
         );
     }
 
-    let repo_log_width = repo_log_width(&repo_names);
     let repo_jobs = repo_names
         .into_iter()
         .map(|repo_name| {
@@ -260,11 +259,10 @@ fn sync_group(
     let base_ref_state = context.ref_state.clone();
     let queue = Arc::new(Mutex::new(repo_jobs));
     let (sender, receiver) = mpsc::channel();
-    let use_status_area = worker_count > 1;
+    let use_repo_logs = worker_count > 1;
     let jobs = context.options.jobs;
-    let _status_guard = use_status_area.then(|| logging::start_status_area(worker_count));
     let failures = thread::scope(|scope| {
-        for worker_id in 0..worker_count {
+        for _ in 0..worker_count {
             let queue = Arc::clone(&queue);
             let sender = sender.clone();
             let redactor = context.redactor.clone();
@@ -275,9 +273,7 @@ fn sync_group(
 
             scope.spawn(move || {
                 while let Some(mut job) = pop_repo_job(&queue) {
-                    let _repo_log_guard = use_status_area.then(|| {
-                        logging::start_repo_log(job.repo_name.clone(), worker_id, repo_log_width)
-                    });
+                    let _repo_log_guard = use_repo_logs.then(logging::start_repo_log);
                     let repo_context = RepoSyncContext {
                         config,
                         mirror,
@@ -383,15 +379,6 @@ fn pop_repo_job(queue: &Arc<Mutex<VecDeque<RepoSyncJob>>>) -> Option<RepoSyncJob
         .pop_front()
 }
 
-fn repo_log_width(repo_names: &BTreeSet<String>) -> usize {
-    repo_names
-        .iter()
-        .map(|name| name.chars().count())
-        .max()
-        .unwrap_or(4)
-        .clamp(4, 32)
-}
-
 struct RepoSyncJob {
     repo_name: String,
     existing: Vec<EndpointRepo>,

tests/unit/logging.rs

@@ -1,13 +1,26 @@
 use super::*;
 
 #[test]
-fn repo_prefix_pads_and_truncates_to_fixed_width() {
-    assert_eq!(repo_prefix("api", 6), "api   ");
-    assert_eq!(repo_prefix("very-long-repo", 8), "very-lo~");
-}
+fn repo_log_context_is_inherited_by_parallel_workers() {
+    let _guard = start_repo_log();
 
-#[test]
-fn status_text_truncates_to_fixed_width() {
-    assert_eq!(truncate_status("short", 8), "short");
-    assert_eq!(truncate_status("very-long-status", 8), "very-lo~");
+    crate::logln!("outer line");
+    crate::parallel::map(vec!["worker line"], 1, |line| {
+        crate::logln!("{line}");
+        Ok::<_, anyhow::Error>(())
+    })
+    .unwrap();
+
+    let lines = {
+        let context = current_repo_log_context().unwrap();
+        context
+            .inner
+            .lines
+            .lock()
+            .unwrap_or_else(|poisoned| poisoned.into_inner())
+            .clone()
+    };
+    finish_repo_log();
+
+    assert_eq!(lines, vec!["outer line", "worker line"]);
 }