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load_env.rs
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load_env.rs
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use nu_engine::{current_dir, CallExt};
use nu_protocol::ast::Call;
use nu_protocol::engine::{Command, EngineState, Stack};
use nu_protocol::{
Category, Example, PipelineData, Record, ShellError, Signature, SyntaxShape, Type, Value,
};
#[derive(Clone)]
pub struct LoadEnv;
impl Command for LoadEnv {
fn name(&self) -> &str {
"load-env"
}
fn usage(&self) -> &str {
"Loads an environment update from a record."
}
fn signature(&self) -> nu_protocol::Signature {
Signature::build("load-env")
.input_output_types(vec![
(Type::Record(vec![]), Type::Nothing),
(Type::Nothing, Type::Nothing),
])
.allow_variants_without_examples(true)
.optional(
"update",
SyntaxShape::Record(vec![]),
"The record to use for updates.",
)
.category(Category::FileSystem)
}
fn run(
&self,
engine_state: &EngineState,
stack: &mut Stack,
call: &Call,
input: PipelineData,
) -> Result<PipelineData, ShellError> {
let arg: Option<Record> = call.opt(engine_state, stack, 0)?;
let span = call.head;
match arg {
Some(record) => {
for (env_var, rhs) in record {
let env_var_ = env_var.as_str();
if ["FILE_PWD", "CURRENT_FILE", "PWD"].contains(&env_var_) {
return Err(ShellError::AutomaticEnvVarSetManually {
envvar_name: env_var,
span: call.head,
});
}
stack.add_env_var(env_var, rhs);
}
Ok(PipelineData::empty())
}
None => match input {
PipelineData::Value(Value::Record { val, .. }, ..) => {
for (env_var, rhs) in *val {
let env_var_ = env_var.as_str();
if ["FILE_PWD", "CURRENT_FILE"].contains(&env_var_) {
return Err(ShellError::AutomaticEnvVarSetManually {
envvar_name: env_var,
span: call.head,
});
}
if env_var == "PWD" {
let cwd = current_dir(engine_state, stack)?;
let rhs = rhs.coerce_into_string()?;
let rhs = nu_path::expand_path_with(rhs, cwd);
stack.add_env_var(
env_var,
Value::string(rhs.to_string_lossy(), call.head),
);
} else {
stack.add_env_var(env_var, rhs);
}
}
Ok(PipelineData::empty())
}
_ => Err(ShellError::UnsupportedInput {
msg: "'load-env' expects a single record".into(),
input: "value originated from here".into(),
msg_span: span,
input_span: input.span().unwrap_or(span),
}),
},
}
}
fn examples(&self) -> Vec<Example> {
vec![
Example {
description: "Load variables from an input stream",
example: r#"{NAME: ABE, AGE: UNKNOWN} | load-env; $env.NAME"#,
result: Some(Value::test_string("ABE")),
},
Example {
description: "Load variables from an argument",
example: r#"load-env {NAME: ABE, AGE: UNKNOWN}; $env.NAME"#,
result: Some(Value::test_string("ABE")),
},
]
}
}
#[cfg(test)]
mod tests {
use super::LoadEnv;
#[test]
fn examples_work_as_expected() {
use crate::test_examples;
test_examples(LoadEnv {})
}
}