Experiment with async/await-enabled ps

Cargo.lock

@@ -641,11 +641,6 @@ dependencies = [
  "winapi 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
-[[package]]
-name = "doc-comment"
-version = "0.3.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-
 [[package]]
 name = "dtoa"
 version = "0.4.4"
@@ -821,6 +816,15 @@ dependencies = [
  "futures-core-preview 0.3.0-alpha.18 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "futures-timer"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "futures-preview 0.3.0-alpha.18 (registry+https://github.com/rust-lang/crates.io-index)",
+ "pin-utils 0.1.0-alpha.4 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "futures-util-preview"
 version = "0.3.0-alpha.18"
@@ -1566,6 +1570,7 @@ dependencies = [
  "enum-utils 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures-async-stream 0.1.0-alpha.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures-preview 0.3.0-alpha.18 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures-timer 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures_codec 0.2.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "getset 0.0.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "git2 0.9.2 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1582,6 +1587,7 @@ dependencies = [
  "nom5_locate 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "onig_sys 69.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "ordered-float 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "pin-utils 0.1.0-alpha.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "pretty-hex 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "pretty_assertions 0.6.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "pretty_env_logger 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1602,7 +1608,6 @@ dependencies = [
  "subprocess 0.1.18 (registry+https://github.com/rust-lang/crates.io-index)",
  "surf 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "syntect 3.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "sysinfo 0.9.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "tempfile 3.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "term 0.5.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "textwrap 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -2619,18 +2624,6 @@ dependencies = [
  "yaml-rust 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
-[[package]]
-name = "sysinfo"
-version = "0.9.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "cfg-if 0.1.9 (registry+https://github.com/rust-lang/crates.io-index)",
- "doc-comment 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.60 (registry+https://github.com/rust-lang/crates.io-index)",
- "rayon 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "winapi 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
 [[package]]
 name = "tempfile"
 version = "3.1.0"
@@ -3181,7 +3174,6 @@ dependencies = [
 "checksum dirs 1.0.5 (registry+https://github.com/rust-lang/crates.io-index)" = "3fd78930633bd1c6e35c4b42b1df7b0cbc6bc191146e512bb3bedf243fcc3901"
 "checksum dirs 2.0.2 (registry+https://github.com/rust-lang/crates.io-index)" = "13aea89a5c93364a98e9b37b2fa237effbb694d5cfe01c5b70941f7eb087d5e3"
 "checksum dirs-sys 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)" = "afa0b23de8fd801745c471deffa6e12d248f962c9fd4b4c33787b055599bde7b"
-"checksum doc-comment 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)" = "923dea538cea0aa3025e8685b20d6ee21ef99c4f77e954a30febbaac5ec73a97"
 "checksum dtoa 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)" = "ea57b42383d091c85abcc2706240b94ab2a8fa1fc81c10ff23c4de06e2a90b5e"
 "checksum dunce 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)" = "d0ad6bf6a88548d1126045c413548df1453d9be094a8ab9fd59bf1fdd338da4f"
 "checksum either 1.5.2 (registry+https://github.com/rust-lang/crates.io-index)" = "5527cfe0d098f36e3f8839852688e63c8fff1c90b2b405aef730615f9a7bcf7b"
@@ -3204,6 +3196,7 @@ dependencies = [
 "checksum futures-io-preview 0.3.0-alpha.18 (registry+https://github.com/rust-lang/crates.io-index)" = "ee7de0c1c9ed23f9457b0437fec7663ce64d9cc3c906597e714e529377b5ddd1"
 "checksum futures-preview 0.3.0-alpha.18 (registry+https://github.com/rust-lang/crates.io-index)" = "efa8f90c4fb2328e381f8adfd4255b4a2b696f77d1c63a3dee6700b564c4e4b5"
 "checksum futures-sink-preview 0.3.0-alpha.18 (registry+https://github.com/rust-lang/crates.io-index)" = "e9b65a2481863d1b78e094a07e9c0eed458cc7dc6e72b22b7138b8a67d924859"
+"checksum futures-timer 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)" = "8f9eb554aa23143abc64ec4d0016f038caf53bb7cbc3d91490835c54edc96550"
 "checksum futures-util-preview 0.3.0-alpha.18 (registry+https://github.com/rust-lang/crates.io-index)" = "7df53daff1e98cc024bf2720f3ceb0414d96fbb0a94f3cad3a5c3bf3be1d261c"
 "checksum futures_codec 0.2.5 (registry+https://github.com/rust-lang/crates.io-index)" = "36552cd31353fd135114510d53b8d120758120c36aa636a9341970f9efb1e4a0"
 "checksum getrandom 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)" = "34f33de6f0ae7c9cb5e574502a562e2b512799e32abb801cd1e79ad952b62b49"
@@ -3393,7 +3386,6 @@ dependencies = [
 "checksum syn 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)" = "c65d951ab12d976b61a41cf9ed4531fc19735c6e6d84a4bb1453711e762ec731"
 "checksum synstructure 0.10.2 (registry+https://github.com/rust-lang/crates.io-index)" = "02353edf96d6e4dc81aea2d8490a7e9db177bf8acb0e951c24940bf866cb313f"
 "checksum syntect 3.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "e80b8831c5a543192ffc3727f01cf0e57579c6ac15558e3048bfb5708892167b"
-"checksum sysinfo 0.9.2 (registry+https://github.com/rust-lang/crates.io-index)" = "a8e841d2045e01c28343a09841a4c2323d0e936dbb813c95d6c76d13a88668d2"
 "checksum tempfile 3.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "7a6e24d9338a0a5be79593e2fa15a648add6138caa803e2d5bc782c371732ca9"
 "checksum term 0.5.2 (registry+https://github.com/rust-lang/crates.io-index)" = "edd106a334b7657c10b7c540a0106114feadeb4dc314513e97df481d5d966f42"
 "checksum term_size 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)" = "9e5b9a66db815dcfd2da92db471106457082577c3c278d4138ab3e3b4e189327"

Cargo.toml

@@ -15,7 +15,6 @@ documentation = "https://book.nushell.sh"
 
 [dependencies]
 rustyline = "5.0.2"
-sysinfo = "0.9.2"
 chrono = { version = "0.4.7", features = ["serde"] }
 derive-new = "0.5.7"
 prettytable-rs = "0.8.0"
@@ -77,6 +76,8 @@ textwrap = {version = "0.11.0", features = ["term_size"]}
 rawkey = {version = "0.1.2", optional = true }
 clipboard = {version = "0.5", optional = true }
 shellexpand = "1.0.0"
+futures-timer = "0.3.0"
+pin-utils = "0.1.0-alpha.4"
 
 [features]
 raw-key = ["rawkey", "neso"]

src/commands/ps.rs

@@ -1,8 +1,13 @@
 use crate::commands::WholeStreamCommand;
 use crate::errors::ShellError;
-use crate::object::process::process_dict;
+use crate::object::TaggedDictBuilder;
 use crate::prelude::*;
-use sysinfo::SystemExt;
+use std::time::Duration;
+use std::usize;
+
+use futures::stream::{StreamExt, TryStreamExt};
+use heim::process::{self as process, Process, ProcessResult};
+use heim::units::{ratio, Ratio};
 
 pub struct PS;
 
@@ -24,28 +29,44 @@ impl WholeStreamCommand for PS {
     }
 }
 
-fn ps(args: CommandArgs, _registry: &CommandRegistry) -> Result<OutputStream, ShellError> {
+async fn usage(process: Process) -> ProcessResult<(process::Process, Ratio)> {
-    let system;
+    let usage_1 = process.cpu_usage().await?;
+    futures_timer::Delay::new(Duration::from_millis(100)).await?;
+    let usage_2 = process.cpu_usage().await?;
 
-    #[cfg(target_os = "linux")]
+    Ok((process, usage_2 - usage_1))
-    {
+}
-        system = sysinfo::System::new();
+
-    }
+fn ps(args: CommandArgs, registry: &CommandRegistry) -> Result<OutputStream, ShellError> {
-
+    let args = args.evaluate_once(registry)?;
-    #[cfg(not(target_os = "linux"))]
+    let span = args.name_span();
-    {
+
-        use sysinfo::RefreshKind;
+    let stream = async_stream_block! {
-        let mut sy = sysinfo::System::new_with_specifics(RefreshKind::new().with_processes());
+        let processes = process::processes()
-        sy.refresh_processes();
+            .map_ok(|process| {
-
+                // Note that there is no `.await` here,
-        system = sy;
+                // as we want to pass the returned future
-    }
+                // into the `.try_buffer_unordered`.
-    let list = system.get_process_list();
+                usage(process)
-
+            })
-    let list = list
+            .try_buffer_unordered(usize::MAX);
-        .into_iter()
+        pin_utils::pin_mut!(processes);
-        .map(|(_, process)| process_dict(process, Tag::unknown_origin(args.call_info.name_span)))
+
-        .collect::<VecDeque<_>>();
+        while let Some(res) = processes.next().await {
-
+            let (process, usage) = res.unwrap();
-    Ok(list.from_input_stream())
+
+            let mut dict = TaggedDictBuilder::new(Tag::unknown_origin(span));
+            dict.insert("pid", Value::int(process.pid()));
+            if let Ok(name) = process.name().await {
+                dict.insert("name", Value::string(name));
+            }
+            if let Ok(status) = process.status().await {
+                dict.insert("status", Value::string(format!("{:?}", status)));
+            }
+            dict.insert("cpu", Value::float(usage.get::<ratio::percent>() as f64));
+            yield ReturnSuccess::value(dict.into_tagged_value());
+        }
+    };
+
+    Ok(stream.to_output_stream())
 }

src/object.rs

@@ -4,7 +4,6 @@ pub(crate) mod dict;
 pub(crate) mod files;
 pub(crate) mod into;
 pub(crate) mod meta;
-pub(crate) mod process;
 pub(crate) mod types;
 
 #[allow(unused)]

src/object/process.rs

@@ -1,29 +0,0 @@
-use crate::object::{TaggedDictBuilder, Value};
-use crate::prelude::*;
-use itertools::join;
-use sysinfo::ProcessExt;
-
-pub(crate) fn process_dict(proc: &sysinfo::Process, tag: impl Into<Tag>) -> Tagged<Value> {
-    let mut dict = TaggedDictBuilder::new(tag);
-
-    let cmd = proc.cmd();
-
-    let cmd_value = if cmd.len() == 0 {
-        Value::nothing()
-    } else {
-        Value::string(join(cmd, ""))
-    };
-
-    dict.insert("pid", Value::int(proc.pid() as i64));
-    dict.insert("status", Value::string(proc.status().to_string()));
-    dict.insert("cpu", Value::float(proc.cpu_usage() as f64));
-    //dict.insert("name", Value::string(proc.name()));
-    match cmd_value {
-        Value::Primitive(Primitive::Nothing) => {
-            dict.insert("name", Value::string(proc.name()));
-        }
-        _ => dict.insert("name", cmd_value),
-    }
-
-    dict.into_tagged_value()
-}