nushell/crates/nu-cli/src/commands/wrap.rs
Jonathan Turner 076fde16dd
Evaluation of command arguments (#1801)
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* Finish adding the baseline refactors for argument invocation

* Finish cleanup and add test

* Add missing plugin references
2020-05-16 15:18:24 +12:00

115 lines
3.1 KiB
Rust

use crate::commands::WholeStreamCommand;
use crate::context::CommandRegistry;
use crate::prelude::*;
use indexmap::IndexMap;
use nu_errors::ShellError;
use nu_protocol::{ReturnSuccess, Signature, SyntaxShape, UntaggedValue, Value};
use nu_source::Tagged;
pub struct Wrap;
#[derive(Deserialize)]
struct WrapArgs {
column: Option<Tagged<String>>,
}
impl WholeStreamCommand for Wrap {
fn name(&self) -> &str {
"wrap"
}
fn signature(&self) -> Signature {
Signature::build("wrap").optional(
"column",
SyntaxShape::String,
"the name of the new column",
)
}
fn usage(&self) -> &str {
"Wraps the given data in a table."
}
fn run(
&self,
args: CommandArgs,
registry: &CommandRegistry,
) -> Result<OutputStream, ShellError> {
// args.process(registry, wrap)?.run()
wrap(args, registry)
}
fn examples(&self) -> &[Example] {
&[
Example {
description: "Wrap a list into a table with the default column name",
example: "echo [1 2 3] | wrap",
},
Example {
description: "Wrap a list into a table with a given column name",
example: "echo [1 2 3] | wrap MyColumn",
},
]
}
}
fn wrap(args: CommandArgs, registry: &CommandRegistry) -> Result<OutputStream, ShellError> {
let registry = registry.clone();
let stream = async_stream! {
let (WrapArgs { column }, mut input) = args.process(&registry).await?;
let mut result_table = vec![];
let mut are_all_rows = true;
while let Some(value) = input.next().await {
match value {
Value {
value: UntaggedValue::Row(_),
..
} => {
result_table.push(value);
}
_ => {
are_all_rows = false;
let mut index_map = IndexMap::new();
index_map.insert(
match &column {
Some(key) => key.item.clone(),
None => "Column".into(),
},
value,
);
result_table.push(UntaggedValue::row(index_map).into_value(Tag::unknown()));
}
}
}
if are_all_rows {
let mut index_map = IndexMap::new();
index_map.insert(
match &column {
Some(key) => key.item.clone(),
None => "Column".into(),
},
UntaggedValue::table(&result_table).into_value(Tag::unknown()),
);
let row = UntaggedValue::row(index_map).into_untagged_value();
yield ReturnSuccess::value(row);
} else {
for item in result_table
.iter()
.map(|row| ReturnSuccess::value(row.clone())) {
yield item;
}
}
};
Ok(stream.to_output_stream())
}