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https://github.com/nushell/nushell.git
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f70c6d5d48
This commit extracts Tag, Span, Text, as well as source-related debug facilities into a new crate called nu_source. This change is much bigger than one might have expected because the previous code relied heavily on implementing inherent methods on `Tagged<T>` and `Spanned<T>`, which is no longer possible. As a result, this change creates more concrete types instead of using `Tagged<T>`. One notable example: Tagged<Value> became Value, and Value became UntaggedValue. This change clarifies the intent of the code in many places, but it does make it a big change.
74 lines
1.9 KiB
Rust
74 lines
1.9 KiB
Rust
use crate::commands::WholeStreamCommand;
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use crate::errors::ShellError;
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use crate::parser::CommandRegistry;
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use crate::prelude::*;
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use nu_source::Tagged;
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#[derive(Deserialize)]
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struct DefaultArgs {
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column: Tagged<String>,
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value: Value,
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}
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pub struct Default;
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impl WholeStreamCommand for Default {
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fn name(&self) -> &str {
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"default"
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}
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fn signature(&self) -> Signature {
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Signature::build("default")
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.required("column name", SyntaxShape::String, "the name of the column")
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.required(
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"column value",
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SyntaxShape::Any,
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"the value of the column to default",
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)
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}
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fn usage(&self) -> &str {
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"Sets a default row's column if missing."
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}
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fn run(
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&self,
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args: CommandArgs,
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registry: &CommandRegistry,
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) -> Result<OutputStream, ShellError> {
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args.process(registry, default)?.run()
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}
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}
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fn default(
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DefaultArgs { column, value }: DefaultArgs,
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RunnableContext { input, .. }: RunnableContext,
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) -> Result<OutputStream, ShellError> {
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let stream = input
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.values
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.map(move |item| {
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let mut result = VecDeque::new();
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let should_add = match item {
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Value {
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value: UntaggedValue::Row(ref r),
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..
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} => r.get_data(&column.item).borrow().is_none(),
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_ => false,
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};
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if should_add {
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match item.insert_data_at_path(&column.item, value.clone()) {
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Some(new_value) => result.push_back(ReturnSuccess::value(new_value)),
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None => result.push_back(ReturnSuccess::value(item)),
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}
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} else {
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result.push_back(ReturnSuccess::value(item));
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}
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result
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})
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.flatten();
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Ok(stream.to_output_stream())
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}
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