2019-12-31 08:36:08 +01:00
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#![allow(clippy::should_implement_trait)]
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Extract core stuff into own crates
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`).
2019-11-26 03:30:48 +01:00
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#[derive(Debug)]
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pub enum MaybeOwned<'a, T> {
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Owned(T),
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Borrowed(&'a T),
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}
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impl<T> MaybeOwned<'_, T> {
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pub fn borrow(&self) -> &T {
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match self {
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MaybeOwned::Owned(v) => v,
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MaybeOwned::Borrowed(v) => v,
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}
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}
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}
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