nushell/crates/nu-command/src/shells/shells_.rs

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2022-01-05 05:35:50 +01:00
use nu_engine::current_dir;
use nu_protocol::ast::Call;
use nu_protocol::engine::{Command, EngineState, Stack};
use nu_protocol::{
Category, IntoInterruptiblePipelineData, PipelineData, ShellError, Signature, Value,
};
/// Source a file for environment variables.
#[derive(Clone)]
pub struct Shells;
impl Command for Shells {
fn name(&self) -> &str {
"shells"
}
fn signature(&self) -> Signature {
Signature::build("shells").category(Category::Shells)
}
fn usage(&self) -> &str {
"Lists all open shells."
}
fn run(
&self,
engine_state: &EngineState,
stack: &mut Stack,
call: &Call,
_input: PipelineData,
) -> Result<PipelineData, ShellError> {
let span = call.head;
let cwd = current_dir(engine_state, stack)?;
let cwd = Value::String {
val: cwd.to_string_lossy().to_string(),
span,
};
let shells = stack.get_env_var(engine_state, "NUSHELL_SHELLS");
let shells = if let Some(v) = shells {
v.as_list()
.map(|x| x.to_vec())
.unwrap_or_else(|_| vec![cwd])
} else {
vec![cwd]
};
let current_shell = stack.get_env_var(engine_state, "NUSHELL_CURRENT_SHELL");
let current_shell = if let Some(v) = current_shell {
v.as_integer().unwrap_or_default() as usize
} else {
0
};
let output = shells
.into_iter()
.enumerate()
.map(move |(idx, val)| Value::Record {
cols: vec!["active".to_string(), "path".to_string()],
vals: vec![
Value::Bool {
val: idx == current_shell,
span,
},
val,
],
span,
});
Ok(output.into_pipeline_data(None))
}
}