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/// Configuration related to sparse indexes.
#[derive(Debug, Default, Clone, Copy)]
pub struct Options {
/// If true, certain entries in the index will be excluded / skipped for certain operations,
/// based on the ignore patterns in the `.git/info/sparse-checkout` file. These entries will
/// carry the [`SKIP_WORKTREE`][crate::entry::Flags::SKIP_WORKTREE] flag.
///
/// This typically is the value of `core.sparseCheckout` in the git configuration.
pub sparse_checkout: bool,
/// Interpret the `.git/info/sparse-checkout` file using _cone mode_.
///
/// If true, _cone mode_ is active and entire directories will be included in the checkout, as well as files in the root
/// of the repository.
/// If false, non-cone mode is active and entries to _include_ will be matched with patterns like those found in `.gitignore` files.
///
/// This typically is the value of `core.sparseCheckoutCone` in the git configuration.
pub directory_patterns_only: bool,
/// If true, will attempt to write a sparse index file which only works in cone mode.
///
/// A sparse index has [`DIR` entries][crate::entry::Mode::DIR] that represent entire directories to be skipped
/// during checkout and other operations due to the added presence of
/// the [`SKIP_WORKTREE`][crate::entry::Flags::SKIP_WORKTREE] flag.
///
/// This is typically the value of `index.sparse` in the git configuration.
pub write_sparse_index: bool,
}
impl Options {
/// Derive a valid mode from all parameters that affect the 'sparseness' of the index.
///
/// Some combinations of them degenerate to one particular mode.
pub fn sparse_mode(&self) -> Mode {
match (
self.sparse_checkout,
self.directory_patterns_only,
self.write_sparse_index,
) {
(true, true, true) => Mode::IncludeDirectoriesStoreIncludedEntriesAndExcludedDirs,
(true, true, false) => Mode::IncludeDirectoriesStoreAllEntriesSkipUnmatched,
(true, false, _) => Mode::IncludeByIgnorePatternStoreAllEntriesSkipUnmatched,
(false, _, _) => Mode::Disabled,
}
}
}
/// Describes the configuration how a sparse index should be written, or if one should be written at all.
#[derive(Debug)]
pub enum Mode {
/// index with DIR entries for exclusion and included entries, directory-only include patterns in `.git/info/sparse-checkout` file.
IncludeDirectoriesStoreIncludedEntriesAndExcludedDirs,
/// index with all file entries and skip worktree flags for exclusion, directory-only include patterns in `.git/info/sparse-checkout` file.
IncludeDirectoriesStoreAllEntriesSkipUnmatched,
/// index with all file entries and skip-worktree flags for exclusion, `ignore` patterns to include entries in `.git/info/sparse-checkout` file.
IncludeByIgnorePatternStoreAllEntriesSkipUnmatched,
/// index with all entries, non is excluded, `.git/info/sparse-checkout` file is not considered, a regular index.
Disabled,
}
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