forked from extern/nushell
95 lines
2.5 KiB
Rust
95 lines
2.5 KiB
Rust
use nu_engine::current_dir;
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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, Example, PipelineData, ShellError, Signature, Value};
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/// Source a file for environment variables.
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#[derive(Clone)]
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pub struct NextShell;
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impl Command for NextShell {
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fn name(&self) -> &str {
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"n"
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}
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fn signature(&self) -> Signature {
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Signature::build("n").category(Category::Shells)
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}
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fn usage(&self) -> &str {
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"Switch to the next shell."
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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 cwd = current_dir(engine_state, stack)?;
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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 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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current_shell += 1;
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if current_shell == shells.len() {
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current_shell = 0;
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}
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let new_path = shells[current_shell].clone();
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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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fn examples(&self) -> Vec<Example> {
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vec![
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Example {
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description: "Make two directories and enter new shells for them, use `n` to jump to the next shell",
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example: r#"mkdir foo bar; enter foo; enter ../bar; n"#,
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result: None,
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},
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Example {
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description: "Run `n` several times and note the changes of current directory",
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example: r#"n"#,
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result: None,
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},
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]
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}
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}
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