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Allow let/let-env to see custom command input (#854)

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JT 2022-01-26 14:00:25 -05:00 committed by GitHub
parent 83ec374995
commit 78b5da8255
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5 changed files with 68 additions and 52 deletions
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8
crates/nu-command/src/core_commands/let_.rs
View File

@ -1,4 +1,4 @@
use nu_engine::eval_expression;
use nu_engine::eval_expression_with_input;
use nu_protocol::ast::Call;
use nu_protocol::engine::{Command, EngineState, Stack};
use nu_protocol::{Category, Example, PipelineData, Signature, SyntaxShape};
@ -31,7 +31,7 @@ impl Command for Let {
engine_state: &EngineState,
stack: &mut Stack,
call: &Call,
_input: PipelineData,
input: PipelineData,
) -> Result<nu_protocol::PipelineData, nu_protocol::ShellError> {
let var_id = call.positional[0]
.as_var()
@ -41,11 +41,11 @@ impl Command for Let {
.as_keyword()
.expect("internal error: missing keyword");
let rhs = eval_expression(engine_state, stack, keyword_expr)?;
let rhs = eval_expression_with_input(engine_state, stack, keyword_expr, input, false)?;
//println!("Adding: {:?} to {}", rhs, var_id);
stack.add_var(var_id, rhs);
stack.add_var(var_id, rhs.into_value(call.head));
Ok(PipelineData::new(call.head))
}

7
crates/nu-command/src/env/let_env.rs vendored
View File

@ -1,4 +1,4 @@
use nu_engine::{current_dir, eval_expression};
use nu_engine::{current_dir, eval_expression_with_input};
use nu_protocol::ast::Call;
use nu_protocol::engine::{Command, EngineState, Stack};
use nu_protocol::{Category, PipelineData, Signature, SyntaxShape, Value};
@ -31,7 +31,7 @@ impl Command for LetEnv {
engine_state: &EngineState,
stack: &mut Stack,
call: &Call,
_input: PipelineData,
input: PipelineData,
) -> Result<nu_protocol::PipelineData, nu_protocol::ShellError> {
let env_var = call.positional[0]
.as_string()
@ -41,7 +41,8 @@ impl Command for LetEnv {
.as_keyword()
.expect("internal error: missing keyword");
let rhs = eval_expression(engine_state, stack, keyword_expr)?;
let rhs = eval_expression_with_input(engine_state, stack, keyword_expr, input, false)?
.into_value(call.head);
if env_var == "PWD" {
let cwd = current_dir(engine_state, stack)?;

95
crates/nu-engine/src/eval.rs
View File

@ -405,6 +405,48 @@ pub fn eval_expression(
}
}
/// Checks the expression to see if it's a internal or external call. If so, passes the input
/// into the call and gets out the result
/// Otherwise, invokes the expression
pub fn eval_expression_with_input(
engine_state: &EngineState,
stack: &mut Stack,
expr: &Expression,
mut input: PipelineData,
last_expression: bool,
) -> Result<PipelineData, ShellError> {
match expr {
Expression {
expr: Expr::Call(call),
..
} => {
input = eval_call(engine_state, stack, call, input)?;
}
Expression {
expr: Expr::ExternalCall(head, args),
..
} => {
input = eval_external(engine_state, stack, head, args, input, last_expression)?;
}
Expression {
expr: Expr::Subexpression(block_id),
..
} => {
let block = engine_state.get_block(*block_id);
// FIXME: protect this collect with ctrl-c
input = eval_subexpression(engine_state, stack, block, input)?;
}
elem => {
input = eval_expression(engine_state, stack, elem)?.into_pipeline_data();
}
}
Ok(input)
}
pub fn eval_block(
engine_state: &EngineState,
stack: &mut Stack,
@ -415,31 +457,13 @@ pub fn eval_block(
for (stmt_idx, stmt) in block.stmts.iter().enumerate() {
if let Statement::Pipeline(pipeline) = stmt {
for (i, elem) in pipeline.expressions.iter().enumerate() {
match elem {
Expression {
expr: Expr::Call(call),
..
} => {
input = eval_call(engine_state, stack, call, input)?;
}
Expression {
expr: Expr::ExternalCall(head, args),
..
} => {
input = eval_external(
engine_state,
stack,
head,
args,
input,
i == pipeline.expressions.len() - 1,
)?;
}
elem => {
input = eval_expression(engine_state, stack, elem)?.into_pipeline_data();
}
}
input = eval_expression_with_input(
engine_state,
stack,
elem,
input,
i == pipeline.expressions.len() - 1,
)?
}
}
@ -511,25 +535,8 @@ pub fn eval_subexpression(
) -> Result<PipelineData, ShellError> {
for stmt in block.stmts.iter() {
if let Statement::Pipeline(pipeline) = stmt {
for elem in pipeline.expressions.iter() {
match elem {
Expression {
expr: Expr::Call(call),
..
} => {
input = eval_call(engine_state, stack, call, input)?;
}
Expression {
expr: Expr::ExternalCall(head, args),
..
} => {
input = eval_external(engine_state, stack, head, args, input, false)?;
}
elem => {
input = eval_expression(engine_state, stack, elem)?.into_pipeline_data();
}
}
for expr in pipeline.expressions.iter() {
input = eval_expression_with_input(engine_state, stack, expr, input, false)?
}
}
}

2
crates/nu-engine/src/lib.rs
View File

@ -9,5 +9,5 @@ pub use call_ext::CallExt;
pub use column::get_columns;
pub use documentation::{generate_docs, get_brief_help, get_documentation, get_full_help};
pub use env::*;
pub use eval::{eval_block, eval_expression, eval_operator};
pub use eval::{eval_block, eval_expression, eval_expression_with_input, eval_operator};
pub use glob_from::glob_from;

8
src/tests/test_engine.rs
View File

@ -166,3 +166,11 @@ fn divide_filesize() -> TestResult {
fn date_comparison() -> TestResult {
run_test(r#"(date now) < ((date now) + 2min)"#, "true")
}
#[test]
fn let_sees_input() -> TestResult {
run_test(
r#"def c [] { let x = str length; $x }; "hello world" | c"#,
"11",
)
}