2021-09-29 20:25:05 +02:00
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use nu_engine::eval_expression;
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use nu_protocol::ast::Call;
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2021-10-25 18:58:58 +02:00
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use nu_protocol::engine::{Command, EngineState, Stack};
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2021-11-17 05:22:37 +01:00
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use nu_protocol::{Category, PipelineData, Signature, SyntaxShape};
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2021-09-29 20:25:05 +02:00
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2021-10-25 06:01:02 +02:00
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#[derive(Clone)]
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2021-09-29 20:25:05 +02:00
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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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2021-12-17 02:04:54 +01:00
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SyntaxShape::Keyword(b"=".to_vec(), Box::new(SyntaxShape::Any)),
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2021-09-29 20:25:05 +02:00
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"equals sign followed by value",
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)
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2021-11-17 05:22:37 +01:00
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.category(Category::Env)
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2021-09-29 20:25:05 +02:00
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}
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fn run(
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&self,
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2021-10-25 08:31:39 +02:00
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engine_state: &EngineState,
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stack: &mut Stack,
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2021-09-29 20:25:05 +02:00
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call: &Call,
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2021-10-25 06:01:02 +02:00
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_input: PipelineData,
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) -> Result<nu_protocol::PipelineData, nu_protocol::ShellError> {
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2021-09-29 20:25:05 +02:00
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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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2021-10-25 08:31:39 +02:00
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let rhs = eval_expression(engine_state, stack, keyword_expr)?;
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2021-09-29 20:25:05 +02:00
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2021-10-25 08:31:39 +02:00
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stack.add_env_var(env_var, rhs);
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2021-11-06 06:50:33 +01:00
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Ok(PipelineData::new(call.head))
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2021-09-29 20:25:05 +02:00
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}
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}
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