1 files changed, 143 insertions, 0 deletions
diff --git a/cli/util/progress_bar.rs b/cli/util/progress_bar.rs
new file mode 100644
index 000000000..5b49fb279
--- /dev/null
+++ b/cli/util/progress_bar.rs
@@ -0,0 +1,143 @@
+// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
+
+use crate::colors;
+use deno_core::parking_lot::Mutex;
+use indexmap::IndexSet;
+use std::sync::Arc;
+use std::time::Duration;
+
+#[derive(Clone, Debug, Default)]
+pub struct ProgressBar(Arc<Mutex<ProgressBarInner>>);
+
+#[derive(Debug)]
+struct ProgressBarInner {
+  pb: Option<indicatif::ProgressBar>,
+  is_tty: bool,
+  in_flight: IndexSet<String>,
+}
+
+impl Default for ProgressBarInner {
+  fn default() -> Self {
+    Self {
+      pb: None,
+      is_tty: colors::is_tty(),
+      in_flight: IndexSet::default(),
+    }
+  }
+}
+
+impl ProgressBarInner {
+  fn get_or_create_pb(&mut self) -> indicatif::ProgressBar {
+    if let Some(pb) = self.pb.as_ref() {
+      return pb.clone();
+    }
+
+    let pb = indicatif::ProgressBar::new_spinner();
+    pb.enable_steady_tick(Duration::from_millis(120));
+    pb.set_prefix("Download");
+    pb.set_style(
+      indicatif::ProgressStyle::with_template(
+        "{prefix:.green} {spinner:.green} {msg}",
+      )
+      .unwrap()
+      .tick_strings(&["⠋", "⠙", "⠹", "⠸", "⠼", "⠴", "⠦", "⠧", "⠇", "⠏"]),
+    );
+    self.pb = Some(pb);
+    self.pb.as_ref().unwrap().clone()
+  }
+
+  fn add_in_flight(&mut self, msg: &str) {
+    if self.in_flight.contains(msg) {
+      return;
+    }
+
+    self.in_flight.insert(msg.to_string());
+  }
+
+  /// Returns if removed "in-flight" was last entry and progress
+  /// bar needs to be updated.
+  fn remove_in_flight(&mut self, msg: &str) -> bool {
+    if !self.in_flight.contains(msg) {
+      return false;
+    }
+
+    let mut is_last = false;
+    if let Some(last) = self.in_flight.last() {
+      is_last = last == msg;
+    }
+    self.in_flight.remove(msg);
+    is_last
+  }
+
+  fn update_progress_bar(&mut self) {
+    let pb = self.get_or_create_pb();
+    if let Some(msg) = self.in_flight.last() {
+      pb.set_message(msg.clone());
+    }
+  }
+}
+
+pub struct UpdateGuard {
+  pb: ProgressBar,
+  msg: String,
+  noop: bool,
+}
+
+impl Drop for UpdateGuard {
+  fn drop(&mut self) {
+    if self.noop {
+      return;
+    }
+
+    let mut inner = self.pb.0.lock();
+    if inner.remove_in_flight(&self.msg) {
+      inner.update_progress_bar();
+    }
+  }
+}
+
+impl ProgressBar {
+  pub fn update(&self, msg: &str) -> UpdateGuard {
+    let mut guard = UpdateGuard {
+      pb: self.clone(),
+      msg: msg.to_string(),
+      noop: false,
+    };
+    let mut inner = self.0.lock();
+
+    // If we're not running in TTY we're just gonna fallback
+    // to using logger crate.
+    if !inner.is_tty {
+      log::log!(log::Level::Info, "{} {}", colors::green("Download"), msg);
+      guard.noop = true;
+      return guard;
+    }
+
+    inner.add_in_flight(msg);
+    inner.update_progress_bar();
+    guard
+  }
+
+  pub fn clear(&self) {
+    let mut inner = self.0.lock();
+
+    if let Some(pb) = inner.pb.as_ref() {
+      pb.finish_and_clear();
+      inner.pb = None;
+    }
+  }
+
+  pub fn clear_guard(&self) -> ClearGuard {
+    ClearGuard { pb: self.clone() }
+  }
+}
+
+pub struct ClearGuard {
+  pb: ProgressBar,
+}
+
+impl Drop for ClearGuard {
+  fn drop(&mut self) {
+    self.pb.clear();
+  }
+}