zccache 1.12.1

Local-first compiler cache for C/C++/Rust/Emscripten
Documentation 
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//! Types backing the request-level fast path and cross-root validation cache.
//!
//! These records describe pre-computed compile-request data so repeated
//! invocations of the same request can skip arg parsing, dep-graph
//! registration, system-include discovery, and response-file expansion.

use super::*;

/// Pre-computed compile request data for the request-level fast path.
pub(super) struct RequestCacheEntry {
    pub(super) context_key: ContextKey,
    pub(super) root: Option<NormalizedPath>,
    pub(super) source_path: CachedRequestPath,
    pub(super) output_path: CachedRequestPath,
    /// Issue #643: where the user wants the depfile written on hit.
    /// `Some` when the original miss saw `-MD`/`-MF` flags, `None`
    /// otherwise. Captured as `CachedRequestPath` so cross-worktree
    /// hits (`cross_root_shareable`) get the destination rebased to
    /// the current key root just like `source_path` / `output_path`.
    pub(super) depfile_path: Option<CachedRequestPath>,
    pub(super) input_paths: Vec<CachedRequestPath>,
    pub(super) cross_root_shareable: bool,
    pub(super) cached_at: std::time::Instant,
}

#[derive(Debug, Clone, PartialEq, Eq, Hash)]
pub(super) struct RequestValidationKey {
    pub(super) request_fp: ContentHash,
    pub(super) root: NormalizedPath,
}

pub(super) struct RequestValidationEntry {
    pub(super) artifact_key_hex: String,
    pub(super) clock: Clock,
    pub(super) cached_at: std::time::Instant,
}

pub(super) struct SessionWorktreeRoot {
    pub(super) working_dir: NormalizedPath,
    pub(super) root: Option<NormalizedPath>,
}

#[derive(Clone)]
pub(super) enum CachedRequestPath {
    RootRelative(NormalizedPath),
    Absolute(NormalizedPath),
}

impl CachedRequestPath {
    pub(super) fn capture(path: &Path, key_root: Option<&Path>) -> Self {
        if let Some(root) = key_root {
            if let Ok(relative) = path.strip_prefix(root) {
                return Self::RootRelative(NormalizedPath::new(relative));
            }
        }
        Self::Absolute(NormalizedPath::new(path))
    }

    pub(super) fn resolve(&self, key_root: Option<&Path>) -> NormalizedPath {
        match (self, key_root) {
            (Self::RootRelative(relative), Some(root)) => root.join(relative).into(),
            (Self::RootRelative(relative), None) | (Self::Absolute(relative), _) => {
                relative.clone()
            }
        }
    }

    pub(super) fn is_root_relative(&self) -> bool {
        matches!(self, Self::RootRelative(_))
    }
}