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

95 lines
2.5 KiB
Rust
Raw Normal View History

2022-01-05 05:35:50 +01:00
use nu_engine::{current_dir, CallExt};
use nu_protocol::ast::Call;
use nu_protocol::engine::{Command, EngineState, Stack};
use nu_protocol::{Category, PipelineData, ShellError, Signature, SyntaxShape, Value};
/// Source a file for environment variables.
#[derive(Clone)]
pub struct Enter;
impl Command for Enter {
fn name(&self) -> &str {
"enter"
}
fn signature(&self) -> Signature {
Signature::build("enter")
.required(
"path",
SyntaxShape::Filepath,
"the path to enter as a new shell",
)
.category(Category::Shells)
}
fn usage(&self) -> &str {
"Enters a new shell at the given path."
}
fn run(
&self,
engine_state: &EngineState,
stack: &mut Stack,
call: &Call,
_input: PipelineData,
) -> Result<PipelineData, ShellError> {
let new_path: Value = call.req(engine_state, stack, 0)?;
let cwd = current_dir(engine_state, stack)?;
2022-01-05 06:50:27 +01:00
if let Ok(s) = new_path.as_path() {
if !s.exists() {
2022-01-05 05:35:50 +01:00
return Err(ShellError::DirectoryNotFound(new_path.span()?));
}
}
let cwd = Value::String {
val: cwd.to_string_lossy().to_string(),
span: call.head,
};
let shells = stack.get_env_var(engine_state, "NUSHELL_SHELLS");
let mut 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 mut current_shell = if let Some(v) = current_shell {
v.as_integer().unwrap_or_default() as usize
} else {
0
};
if current_shell + 1 > shells.len() {
shells.push(new_path.clone());
current_shell = shells.len();
} else {
shells.insert(current_shell + 1, new_path.clone());
current_shell += 1;
}
stack.add_env_var(
"NUSHELL_SHELLS".into(),
Value::List {
vals: shells,
span: call.head,
},
);
stack.add_env_var(
"NUSHELL_CURRENT_SHELL".into(),
Value::Int {
val: current_shell as i64,
span: call.head,
},
);
stack.add_env_var("PWD".into(), new_path);
Ok(PipelineData::new(call.head))
}
}