mirror of
https://github.com/nushell/nushell.git
synced 2024-12-23 23:49:44 +01:00
allow where to work with variables (#5955)
* allow `where` to work with variables; breaking change * change is no longer breaking, adds named to allow passage of blocks * adds tests * fmt
This commit is contained in:
pwygab
GitHub
parent
22edb37162
commit
e77219a59f
@ -2,7 +2,8 @@ use nu_engine::{eval_block, CallExt};
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use nu_protocol::ast::Call;
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use nu_protocol::engine::{CaptureBlock, Command, EngineState, Stack};
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use nu_protocol::{
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Category, Example, IntoInterruptiblePipelineData, PipelineData, Signature, SyntaxShape, Value,
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Category, Example, IntoInterruptiblePipelineData, IntoPipelineData, PipelineData, ShellError,
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Signature, Span, SyntaxShape, Value,
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};
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#[derive(Clone)]
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@ -19,7 +20,13 @@ impl Command for Where {
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fn signature(&self) -> nu_protocol::Signature {
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Signature::build("where")
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.required("cond", SyntaxShape::RowCondition, "condition")
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.optional("cond", SyntaxShape::RowCondition, "condition")
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.named(
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"block",
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SyntaxShape::Block(Some(vec![SyntaxShape::Any])),
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"use where with a block or variable instead",
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Some('b'),
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)
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.category(Category::Filters)
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}
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@ -34,51 +41,172 @@ impl Command for Where {
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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 span = call.head;
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if let Ok(Some(capture_block)) = call.get_flag::<CaptureBlock>(engine_state, stack, "block")
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{
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let metadata = input.metadata();
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let ctrlc = engine_state.ctrlc.clone();
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let engine_state = engine_state.clone();
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let block = engine_state.get_block(capture_block.block_id).clone();
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let mut stack = stack.captures_to_stack(&capture_block.captures);
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let orig_env_vars = stack.env_vars.clone();
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let orig_env_hidden = stack.env_hidden.clone();
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let span = call.head;
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let redirect_stdout = call.redirect_stdout;
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let redirect_stderr = call.redirect_stderr;
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let metadata = input.metadata();
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match input {
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PipelineData::Value(Value::Range { .. }, ..)
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| PipelineData::Value(Value::List { .. }, ..)
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| PipelineData::ListStream { .. } => Ok(input
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.into_iter()
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.filter_map(move |x| {
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stack.with_env(&orig_env_vars, &orig_env_hidden);
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let block: CaptureBlock = call.req(engine_state, stack, 0)?;
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let mut stack = stack.captures_to_stack(&block.captures);
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let block = engine_state.get_block(block.block_id).clone();
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if let Some(var) = block.signature.get_positional(0) {
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if let Some(var_id) = &var.var_id {
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stack.add_var(*var_id, x.clone());
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}
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}
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let ctrlc = engine_state.ctrlc.clone();
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let engine_state = engine_state.clone();
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let redirect_stdout = call.redirect_stdout;
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let redirect_stderr = call.redirect_stderr;
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Ok(input
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.into_iter()
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.filter_map(move |value| {
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if let Some(var) = block.signature.get_positional(0) {
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if let Some(var_id) = &var.var_id {
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stack.add_var(*var_id, value.clone());
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}
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match eval_block(
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&engine_state,
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&mut stack,
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&block,
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x.clone().into_pipeline_data(),
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redirect_stdout,
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redirect_stderr,
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) {
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Ok(v) => {
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if v.into_value(span).is_true() {
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Some(x)
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} else {
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None
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}
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}
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Err(error) => Some(Value::Error { error }),
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}
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})
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.into_pipeline_data(ctrlc)),
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PipelineData::ExternalStream { stdout: None, .. } => {
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Ok(PipelineData::new(call.head))
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}
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let result = eval_block(
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&engine_state,
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&mut stack,
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&block,
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PipelineData::new(span),
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redirect_stdout,
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redirect_stderr,
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);
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PipelineData::ExternalStream {
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stdout: Some(stream),
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..
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} => Ok(stream
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.into_iter()
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.filter_map(move |x| {
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stack.with_env(&orig_env_vars, &orig_env_hidden);
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match result {
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Ok(result) => {
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let result = result.into_value(span);
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if result.is_true() {
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Some(value)
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} else {
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None
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let x = match x {
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Ok(x) => x,
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Err(err) => return Some(Value::Error { error: err }),
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};
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if let Some(var) = block.signature.get_positional(0) {
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if let Some(var_id) = &var.var_id {
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stack.add_var(*var_id, x.clone());
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}
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}
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match eval_block(
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&engine_state,
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&mut stack,
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&block,
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x.clone().into_pipeline_data(),
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redirect_stdout,
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redirect_stderr,
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) {
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Ok(v) => {
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if v.into_value(span).is_true() {
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Some(x)
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} else {
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None
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}
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}
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Err(error) => Some(Value::Error { error }),
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}
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})
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.into_pipeline_data(ctrlc)),
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PipelineData::Value(x, ..) => {
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if let Some(var) = block.signature.get_positional(0) {
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if let Some(var_id) = &var.var_id {
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stack.add_var(*var_id, x.clone());
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}
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}
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Err(err) => Some(Value::Error { error: err }),
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Ok(match eval_block(
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&engine_state,
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&mut stack,
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&block,
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x.clone().into_pipeline_data(),
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redirect_stdout,
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redirect_stderr,
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) {
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Ok(v) => {
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if v.into_value(span).is_true() {
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Some(x)
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} else {
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None
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}
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}
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Err(error) => Some(Value::Error { error }),
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}
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.into_pipeline_data(ctrlc))
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}
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})
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.into_pipeline_data(ctrlc))
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.map(|x| x.set_metadata(metadata))
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}
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.map(|x| x.set_metadata(metadata))
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} else {
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let capture_block: Option<CaptureBlock> = call.opt(engine_state, stack, 0)?;
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if let Some(block) = capture_block {
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let span = call.head;
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let metadata = input.metadata();
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let mut stack = stack.captures_to_stack(&block.captures);
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let block = engine_state.get_block(block.block_id).clone();
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let ctrlc = engine_state.ctrlc.clone();
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let engine_state = engine_state.clone();
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let redirect_stdout = call.redirect_stdout;
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let redirect_stderr = call.redirect_stderr;
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Ok(input
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.into_iter()
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.filter_map(move |value| {
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if let Some(var) = block.signature.get_positional(0) {
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if let Some(var_id) = &var.var_id {
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stack.add_var(*var_id, value.clone());
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}
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}
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let result = eval_block(
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&engine_state,
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&mut stack,
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&block,
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PipelineData::new(span),
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redirect_stdout,
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redirect_stderr,
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);
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match result {
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Ok(result) => {
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let result = result.into_value(span);
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if result.is_true() {
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Some(value)
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} else {
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None
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}
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}
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Err(err) => Some(Value::Error { error: err }),
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}
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})
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.into_pipeline_data(ctrlc))
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.map(|x| x.set_metadata(metadata))
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} else {
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Err(ShellError::MissingParameter(
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"condition".to_string(),
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call.head,
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))
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}
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}
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}
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fn examples(&self) -> Vec<Example> {
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@ -103,6 +231,23 @@ impl Command for Where {
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example: "ls | where modified >= (date now) - 2wk",
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result: None,
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},
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Example {
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description: "Get all numbers above 3 with an existing block condition",
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example: "let a = {$in > 3}; [1, 2, 5, 6] | where -b $a",
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result: Some(Value::List {
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vals: vec![
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Value::Int {
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val: 5,
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span: Span::test_data(),
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},
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Value::Int {
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val: 6,
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span: Span::test_data(),
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},
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],
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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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