forked from extern/nushell
118 lines
3.8 KiB
Rust
118 lines
3.8 KiB
Rust
use crate::commands::WholeStreamCommand;
|
|
use crate::prelude::*;
|
|
use log::trace;
|
|
use nu_errors::ShellError;
|
|
use nu_protocol::{
|
|
Primitive, ReturnSuccess, Signature, SyntaxShape, TaggedDictBuilder, UntaggedValue,
|
|
};
|
|
use nu_source::Tagged;
|
|
|
|
#[derive(Deserialize)]
|
|
struct SplitColumnArgs {
|
|
separator: Tagged<String>,
|
|
rest: Vec<Tagged<String>>,
|
|
#[serde(rename(deserialize = "collapse-empty"))]
|
|
collapse_empty: bool,
|
|
}
|
|
|
|
pub struct SubCommand;
|
|
|
|
impl WholeStreamCommand for SubCommand {
|
|
fn name(&self) -> &str {
|
|
"split column"
|
|
}
|
|
|
|
fn signature(&self) -> Signature {
|
|
Signature::build("split column")
|
|
.required(
|
|
"separator",
|
|
SyntaxShape::Any,
|
|
"the character that denotes what separates columns",
|
|
)
|
|
.switch("collapse-empty", "remove empty columns", Some('c'))
|
|
.rest(SyntaxShape::String, "column names to give the new columns")
|
|
}
|
|
|
|
fn usage(&self) -> &str {
|
|
"splits contents across multiple columns via the separator."
|
|
}
|
|
|
|
fn run(
|
|
&self,
|
|
args: CommandArgs,
|
|
registry: &CommandRegistry,
|
|
) -> Result<OutputStream, ShellError> {
|
|
split_column(args, registry)
|
|
}
|
|
}
|
|
|
|
fn split_column(args: CommandArgs, registry: &CommandRegistry) -> Result<OutputStream, ShellError> {
|
|
let name_span = args.call_info.name_tag.span;
|
|
let registry = registry.clone();
|
|
let stream = async_stream! {
|
|
let (SplitColumnArgs { separator, rest, collapse_empty }, mut input) = args.process(®istry).await?;
|
|
while let Some(v) = input.next().await {
|
|
if let Ok(s) = v.as_string() {
|
|
let splitter = separator.replace("\\n", "\n");
|
|
trace!("splitting with {:?}", splitter);
|
|
|
|
let split_result: Vec<_> = if collapse_empty {
|
|
s.split(&splitter).filter(|s| !s.is_empty()).collect()
|
|
} else {
|
|
s.split(&splitter).collect()
|
|
};
|
|
|
|
trace!("split result = {:?}", split_result);
|
|
|
|
let positional: Vec<_> = rest.iter().map(|f| f.item.clone()).collect();
|
|
|
|
// If they didn't provide column names, make up our own
|
|
if positional.is_empty() {
|
|
let mut gen_columns = vec![];
|
|
for i in 0..split_result.len() {
|
|
gen_columns.push(format!("Column{}", i + 1));
|
|
}
|
|
|
|
let mut dict = TaggedDictBuilder::new(&v.tag);
|
|
for (&k, v) in split_result.iter().zip(gen_columns.iter()) {
|
|
dict.insert_untagged(v.clone(), Primitive::String(k.into()));
|
|
}
|
|
|
|
yield ReturnSuccess::value(dict.into_value());
|
|
} else {
|
|
let mut dict = TaggedDictBuilder::new(&v.tag);
|
|
for (&k, v) in split_result.iter().zip(positional.iter()) {
|
|
dict.insert_untagged(
|
|
v,
|
|
UntaggedValue::Primitive(Primitive::String(k.into())),
|
|
);
|
|
}
|
|
yield ReturnSuccess::value(dict.into_value());
|
|
}
|
|
} else {
|
|
yield Err(ShellError::labeled_error_with_secondary(
|
|
"Expected a string from pipeline",
|
|
"requires string input",
|
|
name_span,
|
|
"value originates from here",
|
|
v.tag.span,
|
|
));
|
|
}
|
|
}
|
|
};
|
|
|
|
Ok(stream.to_output_stream())
|
|
}
|
|
|
|
#[cfg(test)]
|
|
mod tests {
|
|
use super::SubCommand;
|
|
|
|
#[test]
|
|
fn examples_work_as_expected() {
|
|
use crate::examples::test as test_examples;
|
|
|
|
test_examples(SubCommand {})
|
|
}
|
|
}
|