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use std::time::Duration;
use nu_protocol::{
ast::Call,
engine::{Command, EngineState, Stack},
Category, Example, IntoInterruptiblePipelineData, PipelineData, ShellError, Signature, Type,
Value,
};
#[derive(Clone)]
pub struct Ps;
impl Command for Ps {
fn name(&self) -> &str {
"ps"
}
fn signature(&self) -> Signature {
Signature::build("ps")
.input_output_types(vec![(Type::Nothing, Type::Table(vec![]))])
.switch(
"long",
"list all available columns for each entry",
Some('l'),
)
.filter()
.category(Category::System)
}
fn usage(&self) -> &str {
"View information about system processes."
}
fn search_terms(&self) -> Vec<&str> {
vec!["procedures", "operations", "tasks", "ops"]
}
fn run(
&self,
engine_state: &EngineState,
_stack: &mut Stack,
call: &Call,
_input: PipelineData,
) -> Result<nu_protocol::PipelineData, nu_protocol::ShellError> {
run_ps(engine_state, call)
}
fn examples(&self) -> Vec<Example> {
vec![
Example {
description: "List the system processes",
example: "ps",
result: None,
},
Example {
description: "List the top 5 system processes with the highest memory usage",
example: "ps | sort-by mem | last 5",
result: None,
},
Example {
description: "List the top 3 system processes with the highest CPU usage",
example: "ps | sort-by cpu | last 3",
result: None,
},
Example {
description: "List the system processes with 'nu' in their names",
example: "ps | where name =~ 'nu'",
result: None,
},
]
}
}
fn run_ps(engine_state: &EngineState, call: &Call) -> Result<PipelineData, ShellError> {
let mut output = vec![];
let span = call.head;
let long = call.has_flag("long");
for proc in nu_system::collect_proc(Duration::from_millis(100), false) {
let mut cols = vec![];
let mut vals = vec![];
cols.push("pid".to_string());
vals.push(Value::Int {
val: proc.pid() as i64,
span,
});
cols.push("name".to_string());
vals.push(Value::String {
val: proc.name(),
span,
});
#[cfg(not(windows))]
{
cols.push("status".to_string());
vals.push(Value::String {
val: proc.status(),
span,
});
}
cols.push("cpu".to_string());
vals.push(Value::Float {
val: proc.cpu_usage(),
span,
});
cols.push("mem".to_string());
vals.push(Value::Filesize {
val: proc.mem_size() as i64,
span,
});
cols.push("virtual".to_string());
vals.push(Value::Filesize {
val: proc.virtual_size() as i64,
span,
});
if long {
cols.push("command".to_string());
vals.push(Value::String {
val: proc.command(),
span,
});
#[cfg(windows)]
{
cols.push("cwd".to_string());
vals.push(Value::String {
val: proc.cwd(),
span,
});
cols.push("environment".to_string());
vals.push(Value::List {
vals: proc
.environ()
.iter()
.map(|x| Value::string(x.to_string(), span))
.collect(),
span,
});
}
}
output.push(Value::Record { cols, vals, span });
}
Ok(output
.into_iter()
.into_pipeline_data(engine_state.ctrlc.clone()))
}