forked from extern/nushell
51 lines
1.4 KiB
Rust
51 lines
1.4 KiB
Rust
use nu_engine::eval_expression;
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use nu_protocol::ast::Call;
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use nu_protocol::engine::{Command, EvaluationContext};
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use nu_protocol::{PipelineData, Signature, SyntaxShape, Value};
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#[derive(Clone)]
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pub struct LetEnv;
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impl Command for LetEnv {
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fn name(&self) -> &str {
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"let-env"
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}
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fn usage(&self) -> &str {
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"Create an environment variable and give it a value."
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}
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fn signature(&self) -> nu_protocol::Signature {
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Signature::build("let-env")
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.required("var_name", SyntaxShape::String, "variable name")
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.required(
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"initial_value",
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SyntaxShape::Keyword(b"=".to_vec(), Box::new(SyntaxShape::String)),
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"equals sign followed by value",
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)
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}
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fn run(
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&self,
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context: &EvaluationContext,
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call: &Call,
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_input: PipelineData,
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) -> Result<nu_protocol::PipelineData, nu_protocol::ShellError> {
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let env_var = call.positional[0]
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.as_string()
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.expect("internal error: missing variable");
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let keyword_expr = call.positional[1]
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.as_keyword()
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.expect("internal error: missing keyword");
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let rhs = eval_expression(context, keyword_expr)?;
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let rhs = rhs.as_string()?;
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//println!("Adding: {:?} to {}", rhs, var_id);
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context.add_env_var(env_var, rhs);
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Ok(PipelineData::new())
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}
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}
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