progress bar

Cargo.toml

@@ -28,6 +28,7 @@ ansi_term = "0.12.1"
 chrono = "0.4.24"
 clap = { version = "4.1.1", features = ["derive"] }
 clap_complete = "4.1.1"
+crossterm = "0.26.1"
 dirs = "5.0"
 errno = "0.3.1"
 filesize = "0.2.0"

src/context/mod.rs

@@ -180,6 +180,10 @@ pub struct Context {
     #[arg(long)]
     pub no_config: bool,
 
+    /// Hides the progress indicator
+    #[arg(long)]
+    pub no_progress: bool,
+
     /// Omit disk usage from output
     #[arg(long)]
     pub suppress_size: bool,
@@ -525,10 +529,17 @@ impl Context {
     }
 
     /// Setter for `window_width` which is set to the current terminal emulator's window width.
+    #[inline]
     pub fn set_window_width(&mut self) {
         self.window_width = crate::tty::get_window_width(self.stdout_is_tty);
     }
 
+    /// Answers whether disk usage is asked to be reported in bytes.
+    pub const fn byte_metric(&self) -> bool {
+        matches!(self.disk_usage, DiskUsage::Logical)
+            || matches!(self.disk_usage, DiskUsage::Physical)
+    }
+
     /// Do any of the components of a path match the provided glob? This is used for ensuring that
     /// all children of a directory that a glob targets gets captured.
     #[inline]

src/disk_usage/file_size/byte.rs

@@ -17,8 +17,8 @@ pub struct Metric {
     prefix_kind: PrefixKind,
 
     /// To prevent allocating the same string twice. We allocate the first time
-    /// in [`crate::tree::update_column_properties`] in order to compute the max column width for
-    /// human-readable size and the second time during the actual render.
+    /// in [`crate::tree::Tree::update_column_properties`] in order to compute the max column width for
+    /// human-readable size and cache it. It will then be used again when preparing the output.
     cached_display: RefCell<String>,
 }
 

src/main.rs

@@ -1,25 +1,27 @@
 #![cfg_attr(windows, feature(windows_by_handle))]
 #![warn(
     clippy::all,
-    clippy::correctness,
-    clippy::suspicious,
-    clippy::style,
+    clippy::cargo,
     clippy::complexity,
-    clippy::perf,
-    clippy::pedantic,
+    clippy::correctness,
     clippy::nursery,
-    clippy::cargo
+    clippy::pedantic,
+    clippy::perf,
+    clippy::style,
+    clippy::suspicious
 )]
 #![allow(
-    clippy::struct_excessive_bools,
-    clippy::too_many_arguments,
+    clippy::cast_possible_truncation,
     clippy::cast_precision_loss,
     clippy::cast_sign_loss,
-    clippy::cast_possible_truncation
+    clippy::let_underscore_untyped,
+    clippy::struct_excessive_bools,
+    clippy::too_many_arguments
 )]
 
 use clap::CommandFactory;
 use context::{layout, Context};
+use progress::Message;
 use render::{Engine, Flat, Inverted, Regular};
 use std::{error::Error, io::stdout};
 use tree::Tree;
@@ -39,6 +41,9 @@ mod fs;
 /// All things related to icons on how to map certain files to the appropriate icons.
 mod icons;
 
+/// Concerned with displaying a progress indicator when stdout is a tty.
+mod progress;
+
 /// Concerned with taking an initialized [`Tree`] and its [`Node`]s and rendering the output.
 ///
 /// [`Tree`]: tree::Tree
@@ -68,22 +73,31 @@ fn main() -> Result<(), Box<dyn Error>> {
 
     styles::init(ctx.no_color());
 
-    let (tree, ctx) = Tree::try_init_and_update_context(ctx)?;
+    let indicator = (ctx.stdout_is_tty && !ctx.no_progress).then(progress::Indicator::measure);
 
-    match ctx.layout {
+    let (tree, ctx) = Tree::try_init_and_update_context(ctx, indicator.as_ref())?;
+
+    let output = match ctx.layout {
         layout::Type::Flat => {
             let render = Engine::<Flat>::new(tree, ctx);
-            println!("{render}");
+            format!("{render}")
         }
         layout::Type::Inverted => {
             let render = Engine::<Inverted>::new(tree, ctx);
-            println!("{render}");
+            format!("{render}")
         }
         layout::Type::Regular => {
             let render = Engine::<Regular>::new(tree, ctx);
-            println!("{render}");
+            format!("{render}")
         }
+    };
+
+    if let Some(progress) = indicator {
+        progress.mailbox().send(Message::RenderReady)?;
+        progress.join_handle.join().unwrap()?;
     }
 
+    println!("{output}");
+
     Ok(())
 }