ac578b8491
* Begin allowing comments and multiline scripts. * clippy * Finish moving to groups. Test pass * Keep going * WIP * WIP * BROKEN WIP * WIP * WIP * Fix more tests * WIP: alias starts working * Broken WIP * Broken WIP * Variables begin to work * captures start working * A little better but needs fixed scope * Shorthand env setting * Update main merge * Broken WIP * WIP * custom command parsing * Custom commands start working * Fix coloring and parsing of block * Almost there * Add some tests * Add more param types * Bump version * Fix benchmark * Fix stuff
87 lines
2.3 KiB
Rust
87 lines
2.3 KiB
Rust
use crate::commands::WholeStreamCommand;
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use crate::prelude::*;
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use futures::stream::StreamExt;
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use nu_errors::ShellError;
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use nu_protocol::{Signature, UntaggedValue, Value};
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pub struct Count;
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#[derive(Deserialize)]
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pub struct CountArgs {
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column: bool,
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}
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#[async_trait]
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impl WholeStreamCommand for Count {
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fn name(&self) -> &str {
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"count"
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}
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fn signature(&self) -> Signature {
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Signature::build("count").switch(
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"column",
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"Calculate number of columns in table",
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Some('c'),
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)
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}
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fn usage(&self) -> &str {
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"Show the total number of rows or items."
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}
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async fn run(&self, args: CommandArgs) -> Result<OutputStream, ShellError> {
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let tag = args.call_info.name_tag.clone();
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let (CountArgs { column }, input) = args.process().await?;
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let rows: Vec<Value> = input.collect().await;
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let count = if column {
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if rows.is_empty() {
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0
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} else {
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match &rows[0].value {
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UntaggedValue::Row(dictionary) => dictionary.length(),
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_ => {
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return Err(ShellError::labeled_error(
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"Cannot obtain column count",
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"cannot obtain column count",
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tag,
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));
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}
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}
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}
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} else {
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rows.len()
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};
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Ok(OutputStream::one(UntaggedValue::int(count).into_value(tag)))
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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: "Count the number of entries in a list",
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example: "echo [1 2 3 4 5] | count",
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result: Some(vec![UntaggedValue::int(5).into()]),
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},
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Example {
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description: "Count the number of columns in the calendar table",
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example: "cal | count -c",
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result: None,
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},
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]
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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::Count;
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use super::ShellError;
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#[test]
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fn examples_work_as_expected() -> Result<(), ShellError> {
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use crate::examples::test as test_examples;
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Ok(test_examples(Count {})?)
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}
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}
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