e4226def16
This commit extracts five new crates:
- nu-source, which contains the core source-code handling logic in Nu,
including Text, Span, and also the pretty.rs-based debug logic
- nu-parser, which is the parser and expander logic
- nu-protocol, which is the bulk of the types and basic conveniences
used by plugins
- nu-errors, which contains ShellError, ParseError and error handling
conveniences
- nu-textview, which is the textview plugin extracted into a crate
One of the major consequences of this refactor is that it's no longer
possible to `impl X for Spanned<Y>` outside of the `nu-source` crate, so
a lot of types became more concrete (Value became a concrete type
instead of Spanned<Value>, for example).
This also turned a number of inherent methods in the main nu crate into
plain functions (impl Value {} became a bunch of functions in the
`value` namespace in `crate::data::value`).
75 lines
2.0 KiB
Rust
75 lines
2.0 KiB
Rust
use crate::commands::WholeStreamCommand;
|
|
use crate::context::CommandRegistry;
|
|
use crate::prelude::*;
|
|
use nu_errors::ShellError;
|
|
use nu_protocol::{ReturnSuccess, Signature, SyntaxShape, UntaggedValue, Value};
|
|
use nu_source::Tagged;
|
|
|
|
#[derive(Deserialize)]
|
|
struct DefaultArgs {
|
|
column: Tagged<String>,
|
|
value: Value,
|
|
}
|
|
|
|
pub struct Default;
|
|
|
|
impl WholeStreamCommand for Default {
|
|
fn name(&self) -> &str {
|
|
"default"
|
|
}
|
|
|
|
fn signature(&self) -> Signature {
|
|
Signature::build("default")
|
|
.required("column name", SyntaxShape::String, "the name of the column")
|
|
.required(
|
|
"column value",
|
|
SyntaxShape::Any,
|
|
"the value of the column to default",
|
|
)
|
|
}
|
|
|
|
fn usage(&self) -> &str {
|
|
"Sets a default row's column if missing."
|
|
}
|
|
|
|
fn run(
|
|
&self,
|
|
args: CommandArgs,
|
|
registry: &CommandRegistry,
|
|
) -> Result<OutputStream, ShellError> {
|
|
args.process(registry, default)?.run()
|
|
}
|
|
}
|
|
|
|
fn default(
|
|
DefaultArgs { column, value }: DefaultArgs,
|
|
RunnableContext { input, .. }: RunnableContext,
|
|
) -> Result<OutputStream, ShellError> {
|
|
let stream = input
|
|
.values
|
|
.map(move |item| {
|
|
let mut result = VecDeque::new();
|
|
|
|
let should_add = match item {
|
|
Value {
|
|
value: UntaggedValue::Row(ref r),
|
|
..
|
|
} => r.get_data(&column.item).borrow().is_none(),
|
|
_ => false,
|
|
};
|
|
|
|
if should_add {
|
|
match item.insert_data_at_path(&column.item, value.clone()) {
|
|
Some(new_value) => result.push_back(ReturnSuccess::value(new_value)),
|
|
None => result.push_back(ReturnSuccess::value(item)),
|
|
}
|
|
} else {
|
|
result.push_back(ReturnSuccess::value(item));
|
|
}
|
|
result
|
|
})
|
|
.flatten();
|
|
|
|
Ok(stream.to_output_stream())
|
|
}
|