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