nushell/crates/nu-cli/src/commands/group_by_date.rs

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use crate::commands::WholeStreamCommand;
use crate::prelude::*;
use nu_errors::ShellError;
use nu_protocol::{ReturnSuccess, Signature, SyntaxShape, UntaggedValue, Value};
use nu_source::Tagged;
pub struct GroupByDate;
#[derive(Deserialize)]
pub struct GroupByDateArgs {
column_name: Option<Tagged<String>>,
format: Option<Tagged<String>>,
}
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#[async_trait]
impl WholeStreamCommand for GroupByDate {
fn name(&self) -> &str {
"group-by date"
}
fn signature(&self) -> Signature {
Signature::build("group-by date")
.optional(
"column_name",
SyntaxShape::String,
"the name of the column to group by",
)
.named(
"format",
SyntaxShape::String,
"Specify date and time formatting",
Some('f'),
)
}
fn usage(&self) -> &str {
"Creates a new table with the data from the table rows grouped by the column given."
}
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async fn run(
&self,
args: CommandArgs,
registry: &CommandRegistry,
) -> Result<OutputStream, ShellError> {
group_by_date(args, registry).await
}
fn examples(&self) -> Vec<Example> {
vec![Example {
description: "Group files by type",
example: "ls | group-by date --format '%d/%m/%Y'",
result: None,
}]
}
}
enum Grouper {
ByDate(Option<Tagged<String>>),
}
enum GroupByColumn {
Name(Option<Tagged<String>>),
}
pub async fn group_by_date(
args: CommandArgs,
registry: &CommandRegistry,
) -> Result<OutputStream, ShellError> {
let registry = registry.clone();
let name = args.call_info.name_tag.clone();
let (
GroupByDateArgs {
column_name,
format,
},
input,
) = args.process(&registry).await?;
let values: Vec<Value> = input.collect().await;
if values.is_empty() {
Err(ShellError::labeled_error(
"Expected table from pipeline",
"requires a table input",
name,
))
} else {
let values = UntaggedValue::table(&values).into_value(&name);
let grouper_column = if let Some(column_name) = column_name {
GroupByColumn::Name(Some(column_name))
} else {
GroupByColumn::Name(None)
};
let grouper_date = if let Some(date_format) = format {
Grouper::ByDate(Some(date_format))
} else {
Grouper::ByDate(None)
};
match (grouper_date, grouper_column) {
(Grouper::ByDate(None), GroupByColumn::Name(None)) => {
let block = Box::new(move |row: &Value| row.format("%Y-%b-%d"));
match crate::utils::data::group(&values, &Some(block), &name) {
Ok(grouped) => Ok(OutputStream::one(ReturnSuccess::value(grouped))),
Err(err) => Err(err),
}
}
(Grouper::ByDate(None), GroupByColumn::Name(Some(column_name))) => {
let block = Box::new(move |row: &Value| {
let group_key = match row.get_data_by_key(column_name.borrow_spanned()) {
Some(group_key) => Ok(group_key),
None => Err(suggestions(column_name.borrow_tagged(), &row)),
};
group_key?.format("%Y-%b-%d")
});
match crate::utils::data::group(&values, &Some(block), &name) {
Ok(grouped) => Ok(OutputStream::one(ReturnSuccess::value(grouped))),
Err(err) => Err(err),
}
}
(Grouper::ByDate(Some(fmt)), GroupByColumn::Name(None)) => {
let block = Box::new(move |row: &Value| row.format(&fmt));
match crate::utils::data::group(&values, &Some(block), &name) {
Ok(grouped) => Ok(OutputStream::one(ReturnSuccess::value(grouped))),
Err(err) => Err(err),
}
}
(Grouper::ByDate(Some(fmt)), GroupByColumn::Name(Some(column_name))) => {
let block = Box::new(move |row: &Value| {
let group_key = match row.get_data_by_key(column_name.borrow_spanned()) {
Some(group_key) => Ok(group_key),
None => Err(suggestions(column_name.borrow_tagged(), &row)),
};
group_key?.format(&fmt)
});
match crate::utils::data::group(&values, &Some(block), &name) {
Ok(grouped) => Ok(OutputStream::one(ReturnSuccess::value(grouped))),
Err(err) => Err(err),
}
}
}
}
}
pub fn suggestions(tried: Tagged<&str>, for_value: &Value) -> ShellError {
let possibilities = for_value.data_descriptors();
let mut possible_matches: Vec<_> = possibilities
.iter()
.map(|x| (natural::distance::levenshtein_distance(x, &tried), x))
.collect();
possible_matches.sort();
if !possible_matches.is_empty() {
ShellError::labeled_error(
"Unknown column",
format!("did you mean '{}'?", possible_matches[0].1),
tried.tag(),
)
} else {
ShellError::labeled_error(
"Unknown column",
"row does not contain this column",
tried.tag(),
)
}
}
#[cfg(test)]
mod tests {
use super::GroupByDate;
#[test]
fn examples_work_as_expected() {
use crate::examples::test as test_examples;
test_examples(GroupByDate {})
}
}