forked from extern/nushell
9996e4a1f8
# Description Continuing from #12568, this PR further reduces the size of `Expr` from 64 to 40 bytes. It also reduces `Expression` from 128 to 96 bytes and `Type` from 32 to 24 bytes. This was accomplished by: - for `Expr` with multiple fields (e.g., `Expr::Thing(A, B, C)`), merging the fields into new AST struct types and then boxing this struct (e.g. `Expr::Thing(Box<ABC>)`). - replacing `Vec<T>` with `Box<[T]>` in multiple places. `Expr`s and `Expression`s should rarely be mutated, if at all, so this optimization makes sense. By reducing the size of these types, I didn't notice a large performance improvement (at least compared to #12568). But this PR does reduce the memory usage of nushell. My config is somewhat light so I only noticed a difference of 1.4MiB (38.9MiB vs 37.5MiB). --------- Co-authored-by: Stefan Holderbach <sholderbach@users.noreply.github.com>
50 lines
1.3 KiB
Rust
50 lines
1.3 KiB
Rust
use nu_plugin::{EngineInterface, EvaluatedCall, SimplePluginCommand};
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use nu_protocol::{Category, LabeledError, Signature, Type, Value};
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use crate::ExamplePlugin;
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pub struct Config;
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impl SimplePluginCommand for Config {
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type Plugin = ExamplePlugin;
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fn name(&self) -> &str {
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"example config"
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}
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fn usage(&self) -> &str {
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"Show plugin configuration"
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}
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fn extra_usage(&self) -> &str {
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"The configuration is set under $env.config.plugins.example"
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}
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fn signature(&self) -> Signature {
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Signature::build(self.name())
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.category(Category::Experimental)
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.input_output_type(Type::Nothing, Type::table())
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}
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fn search_terms(&self) -> Vec<&str> {
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vec!["example", "configuration"]
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}
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fn run(
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&self,
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_plugin: &ExamplePlugin,
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engine: &EngineInterface,
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call: &EvaluatedCall,
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_input: &Value,
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) -> Result<Value, LabeledError> {
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let config = engine.get_plugin_config()?;
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match config {
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Some(config) => Ok(config.clone()),
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None => Err(LabeledError::new("No config sent").with_label(
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"configuration for this plugin was not found in `$env.config.plugins.example`",
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call.head,
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)),
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}
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}
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}
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