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https://github.com/nushell/nushell.git
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193b00764b
* Moves off of draining between filters. Instead, the sink will pull on the stream, and will drain element-wise. This moves the whole stream to being lazy. * Adds ctrl-c support and connects it into some of the key points where we pull on the stream. If a ctrl-c is detect, we immediately halt pulling on the stream and return to the prompt. * Moves away from having a SourceMap where anchor locations are stored. Now AnchorLocation is kept directly in the Tag. * To make this possible, split tag and span. Span is largely used in the parser and is copyable. Tag is now no longer copyable.
95 lines
2.9 KiB
Rust
95 lines
2.9 KiB
Rust
use nu::{
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serve_plugin, CallInfo, Plugin, Primitive, ReturnSuccess, ReturnValue, ShellError, Signature,
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Tagged, TaggedItem, Value,
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};
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struct Sum {
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total: Option<Tagged<Value>>,
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}
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impl Sum {
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fn new() -> Sum {
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Sum { total: None }
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}
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fn sum(&mut self, value: Tagged<Value>) -> Result<(), ShellError> {
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match value.item() {
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Value::Primitive(Primitive::Nothing) => Ok(()),
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Value::Primitive(Primitive::Int(i)) => {
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match &self.total {
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Some(Tagged {
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item: Value::Primitive(Primitive::Int(j)),
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tag,
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}) => {
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//TODO: handle overflow
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self.total = Some(Value::int(i + j).tagged(tag));
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Ok(())
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}
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None => {
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self.total = Some(value.clone());
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Ok(())
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}
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_ => Err(ShellError::labeled_error(
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"Could not sum non-integer or unrelated types",
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"source",
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value.tag,
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)),
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}
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}
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Value::Primitive(Primitive::Bytes(b)) => {
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match &self.total {
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Some(Tagged {
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item: Value::Primitive(Primitive::Bytes(j)),
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tag,
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}) => {
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//TODO: handle overflow
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self.total = Some(Value::bytes(b + j).tagged(tag));
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Ok(())
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}
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None => {
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self.total = Some(value);
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Ok(())
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}
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_ => Err(ShellError::labeled_error(
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"Could not sum non-integer or unrelated types",
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"source",
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value.tag,
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)),
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}
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}
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x => Err(ShellError::labeled_error(
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format!("Unrecognized type in stream: {:?}", x),
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"source",
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value.tag,
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)),
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}
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}
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}
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impl Plugin for Sum {
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fn config(&mut self) -> Result<Signature, ShellError> {
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Ok(Signature::build("sum")
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.desc("Sum a column of values.")
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.filter())
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}
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fn begin_filter(&mut self, _: CallInfo) -> Result<Vec<ReturnValue>, ShellError> {
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Ok(vec![])
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}
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fn filter(&mut self, input: Tagged<Value>) -> Result<Vec<ReturnValue>, ShellError> {
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self.sum(input)?;
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Ok(vec![])
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}
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fn end_filter(&mut self) -> Result<Vec<ReturnValue>, ShellError> {
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match self.total {
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None => Ok(vec![]),
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Some(ref v) => Ok(vec![ReturnSuccess::value(v.clone())]),
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}
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}
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}
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fn main() {
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serve_plugin(&mut Sum::new());
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}
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