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# Extend `enumerate-ordered` (new major version!)
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Modify `enumerate-ordered` to add more sort-by key options (instead of just times,) including a `printf()`-like "string format" key option.
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//! User-defined arbitrary format string ordering key spec & replacement.
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use super::*;
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use std::{
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path::Path,
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};
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/// Used to identify and parse a token in a format string `%[OPT...]C` where `C` is the character used to idenfity the type's parser as valid for the sequence.
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pub trait ParseToken {
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/// The returned order-by object that can be reduced to a comparable `Cow<str>`-like slice for comparing with other tokens in a `Format` string.
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type Substitute: Ord; //TODO: What trait bounds should be on this? Is it okay to just be `Ord`??? Or must it be something like... `<T: ParseToken>: PartialOrd<T>` instead? (XXX: Is `Ord` enough here? Since the list index of `ParseToken`s will be the same for every path in any given `Format` instance... How can we do this non-polymorphically??? Am I forgetting how to write Rust now...???? ehh...)
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// Parsing stage (during arg-parse).
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/// Attempt to check if `substring` should match this parser.
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/// The layout of `substring` will be in the format `/%.*(.)/` where group 1 is the character matched (and `end_char` is the extracted codepoint of it.)
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/// # Returns
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/// If it does, the matched portion of `substring` should be returned. (__NOTE__: The returned string **must** be *within* `substring`.)
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fn visit<'matched>(&self, substring: &'matched str, end_char: char) -> Option<&'matched str>;
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/// Parse from a matched `visit()` call into the options of this instance of the parser type.
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/// The options encoded in `substring` should set the state in `self` (if there is state.)
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/// If parsing fails, the parser should return an error (which will be wrapped in context by the caller before reporting.)
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fn parse(&mut self, substring: &str) -> eyre::Result<()>;
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// Substituting state (during work for individual paths)
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/// Create a substitute for this specific substring (identified in parsing stage above) for this specific path that can inserted into the `Format`'s list of reconstituted substrings to be compared with other outputs of the *same token index* for the *same substring* of a different path in the *same `Format` host*.
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///
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/// # Panics
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/// A panic should be used to signal failure, as this method should not fail in general. Any possible failures should be reported in `parse()`
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// TOOD: Should we pass more then the `path`? I think when this `OrderBy` mode is selected, we should *not* do the `statx()` of the pathname itself before the comparison, since it may be irrelevent to the operation of this specific token, so.
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fn substitute(&self, path: &Path) -> Self::Substitute;
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}
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/// Options available for filename/path-like tokens (see below.)
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///
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/// # Example
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/// The token `%p` and `%n` can be modified with `PathTokenOpt` as: `%[S..[-]E]n` or `%[S..[-]E]p` to slice the name.
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struct PathTokenOpt {
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slice: Option<(usize, Option<usize>)>,
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}
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impl ParseToken for PathTokenOpt {
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//TODO: Impl visit, parse & substitute for `%[S..[-]E]C`
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}
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enum Token<'source> {
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/// Part is a string literal, no replacement.
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Literal(&'source str),
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/// Specifically for escaped characters (e.g. `"%%"` -> `'%'`)
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Escaped(char),
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/// Part is `%[S..E]n`: Filename (not path, just the file *name*.)
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Filename(PathTokenOpt),
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/// Part is `%[S..E]p`: *Full* path.
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Path(PathTokenOpt),
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//TODO: Add rest...
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}
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impl<'source> ParseToken for Token<'source> {
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//TODO: Add forwarding impl for each variant (where needed, like `Filename` & `Path`; for literals and escapes this can be handled here.)
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// XXX: `visit()` can be implemented without forwarding since implementors like `PathTokenOpt` can be invariant wrt. the thing they're operating on.
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//XXX: How are we going to define `Self::Substitute` here??? I think maybe having `Token` as an enum is not going to work here...
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//TODO: We might need to do this with `dyn ParseToken` and have `Format::tokens: Vec<Box<dyn ParseToken + 'input>>` instead or something...
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}
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/// A parsed format-string whose values are replaced with that of the target file when comparing via order.
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///
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/// TODO: See if we can make it work as `<&[&dyn AsRef<str> + PartialOrd<str> + '_] as PartialOrd>` or something in implementation to avoid allocating where possible when substituting the parsed tokens (order each split part of the string)
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#[derive(Debug, Clone, PartialEq, Eq, Hash)]
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pub struct Format<'input> {
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/// The parsed tokens
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tokens: Vec<Token<'input>>,
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//TODO: How to design this type...? See above `ParseToken` trait & its impl for `Token<'source>`...
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}
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