1 files changed, 123 insertions, 0 deletions
diff --git a/cli/util/progress_bar/mod.rs b/cli/util/progress_bar/mod.rs
new file mode 100644
index 000000000..122db7a59
--- /dev/null
+++ b/cli/util/progress_bar/mod.rs
@@ -0,0 +1,123 @@
+// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
+
+use crate::colors;
+
+use self::draw_thread::DrawThread;
+use self::draw_thread::ProgressBarEntry;
+
+use super::console::console_size;
+
+mod draw_thread;
+mod renderer;
+
+// Inspired by Indicatif, but this custom implementation allows
+// for more control over what's going on under the hood.
+
+pub struct UpdateGuard {
+  maybe_entry: Option<ProgressBarEntry>,
+}
+
+impl Drop for UpdateGuard {
+  fn drop(&mut self) {
+    if let Some(entry) = &self.maybe_entry {
+      entry.finish();
+    }
+  }
+}
+
+impl UpdateGuard {
+  pub fn set_position(&self, value: u64) {
+    if let Some(entry) = &self.maybe_entry {
+      entry.set_position(value);
+    }
+  }
+
+  pub fn set_total_size(&self, value: u64) {
+    if let Some(entry) = &self.maybe_entry {
+      entry.set_total_size(value);
+    }
+  }
+}
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum ProgressBarStyle {
+  DownloadBars,
+  TextOnly,
+}
+
+#[derive(Clone, Debug)]
+pub struct ProgressBar {
+  draw_thread: Option<DrawThread>,
+}
+
+impl ProgressBar {
+  /// Checks if progress bars are supported
+  pub fn are_supported() -> bool {
+    atty::is(atty::Stream::Stderr)
+      && log::log_enabled!(log::Level::Info)
+      && console_size()
+        .map(|s| s.cols > 0 && s.rows > 0)
+        .unwrap_or(false)
+  }
+
+  pub fn new(style: ProgressBarStyle) -> Self {
+    Self {
+      draw_thread: match Self::are_supported() {
+        true => Some(DrawThread::new(match style {
+          ProgressBarStyle::DownloadBars => {
+            Box::new(renderer::BarProgressBarRenderer)
+          }
+          ProgressBarStyle::TextOnly => {
+            Box::new(renderer::TextOnlyProgressBarRenderer)
+          }
+        })),
+        false => None,
+      },
+    }
+  }
+
+  pub fn is_enabled(&self) -> bool {
+    self.draw_thread.is_some()
+  }
+
+  pub fn update(&self, msg: &str) -> UpdateGuard {
+    match &self.draw_thread {
+      Some(draw_thread) => {
+        let entry = draw_thread.add_entry(msg.to_string());
+        UpdateGuard {
+          maybe_entry: Some(entry),
+        }
+      }
+      None => {
+        // if we're not running in TTY, fallback to using logger crate
+        if !msg.is_empty() {
+          log::log!(log::Level::Info, "{} {}", colors::green("Download"), msg);
+        }
+        UpdateGuard { maybe_entry: None }
+      }
+    }
+  }
+
+  pub fn clear_guard(&self) -> ClearGuard {
+    if let Some(draw_thread) = &self.draw_thread {
+      draw_thread.increment_clear();
+    }
+    ClearGuard { pb: self.clone() }
+  }
+
+  fn decrement_clear(&self) {
+    if let Some(draw_thread) = &self.draw_thread {
+      draw_thread.decrement_clear();
+    }
+  }
+}
+
+pub struct ClearGuard {
+  pb: ProgressBar,
+}
+
+impl Drop for ClearGuard {
+  fn drop(&mut self) {
+    self.pb.decrement_clear();
+  }
+}