forked from extern/nushell
c33104c4ae
* :Interm work porting compact to engine-q * Port 'compact' command from nushell to engine-q * Fixed example
117 lines
3.6 KiB
Rust
117 lines
3.6 KiB
Rust
use nu_engine::CallExt;
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use nu_protocol::{
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ast::Call, engine::Command, engine::EngineState, engine::Stack, Category, Example,
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PipelineData, ShellError, Signature, Span, SyntaxShape, Value,
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};
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#[derive(Clone)]
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pub struct Compact;
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impl Command for Compact {
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fn name(&self) -> &str {
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"compact"
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}
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fn signature(&self) -> Signature {
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Signature::build("compact")
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.rest(
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"columns",
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SyntaxShape::Any,
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"the columns to compact from the table",
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)
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.category(Category::Filters)
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}
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fn usage(&self) -> &str {
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"Creates a table with non-empty rows."
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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<nu_protocol::PipelineData, ShellError> {
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compact(engine_state, stack, call, input)
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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: "Filter out all records where 'Hello' is null (returns nothing)",
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example: r#"echo [["Hello" "World"]; [$nothing 3]]| compact Hello"#,
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result: Some(Value::List {
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vals: vec![],
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span: Span::test_data(),
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}),
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},
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Example {
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description: "Filter out all records where 'World' is null (Returns the table)",
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example: r#"echo [["Hello" "World"]; [$nothing 3]]| compact World"#,
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result: Some(Value::List {
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vals: vec![Value::Record {
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cols: vec!["Hello".into(), "World".into()],
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vals: vec![Value::nothing(Span::test_data()), Value::test_int(3)],
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span: Span::test_data(),
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}],
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span: Span::test_data(),
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}),
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},
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Example {
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description: "Filter out all instances of nothing from a list (Returns [1,2]",
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example: r#"echo [1, $nothing, 2] | compact"#,
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result: Some(Value::List {
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vals: vec![Value::test_int(1), Value::test_int(2)],
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span: Span::test_data(),
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}),
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},
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]
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}
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}
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pub fn compact(
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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<nu_protocol::PipelineData, ShellError> {
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let columns: Vec<String> = call.rest(engine_state, stack, 0)?;
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input.filter(
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move |item| {
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match item {
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// Nothing is filtered out
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Value::Nothing { .. } => false,
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Value::Record { .. } => {
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for column in columns.iter() {
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match item.get_data_by_key(column) {
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None => return false,
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Some(x) => {
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if let Value::Nothing { .. } = x {
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return false;
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}
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}
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}
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}
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// No defined columns contained Nothing
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true
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}
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// Any non-Nothing, non-record should be kept
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_ => true,
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}
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},
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engine_state.ctrlc.clone(),
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)
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}
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#[cfg(test)]
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mod tests {
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use super::Compact;
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#[test]
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fn examples_work_as_expected() {
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use crate::test_examples;
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test_examples(Compact {})
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}
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}
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