gix_diff/tree_with_rewrites/change.rs
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use crate::blob::{DiffLineStats, ResourceKind};
use crate::tree;
use bstr::BString;
use bstr::{BStr, ByteSlice};
/// Represents any possible change in order to turn one tree into another, which references data owned by its producer.
#[derive(Debug, Clone, Copy)]
pub enum ChangeRef<'a> {
/// An entry was added, like the addition of a file or directory.
Addition {
/// The location of the file or directory.
///
/// It may be empty if [file names](super::Options::location) is `None`.
location: &'a BStr,
/// The mode of the added entry.
entry_mode: gix_object::tree::EntryMode,
/// Identifies a relationship between this instance and another one,
/// making it easy to reconstruct the top-level of directory changes.
relation: Option<tree::visit::Relation>,
/// The object id of the added entry.
id: gix_hash::ObjectId,
},
/// An entry was deleted, like the deletion of a file or directory.
Deletion {
/// The location of the file or directory.
///
/// It may be empty if [file names](super::Options::location) is `None`.
/// are tracked.
location: &'a BStr,
/// The mode of the deleted entry.
entry_mode: gix_object::tree::EntryMode,
/// Identifies a relationship between this instance and another one,
/// making it easy to reconstruct the top-level of directory changes.
relation: Option<tree::visit::Relation>,
/// The object id of the deleted entry.
id: gix_hash::ObjectId,
},
/// An entry was modified, e.g. changing the contents of a file adjusts its object id and turning
/// a file into a symbolic link adjusts its mode.
Modification {
/// The location of the file or directory.
///
/// It may be empty if [file names](super::Options::location) is `None`.
/// are tracked.
location: &'a BStr,
/// The mode of the entry before the modification.
previous_entry_mode: gix_object::tree::EntryMode,
/// The object id of the entry before the modification.
previous_id: gix_hash::ObjectId,
/// The mode of the entry after the modification.
entry_mode: gix_object::tree::EntryMode,
/// The object id after the modification.
id: gix_hash::ObjectId,
},
/// Entries are considered rewritten if they are not trees and they, according to some understanding of identity, were renamed
/// or copied.
/// In case of renames, this means they originally appeared as [`Deletion`](ChangeRef::Deletion) signalling their source as well as an
/// [`Addition`](ChangeRef::Addition) acting as destination.
///
/// In case of copies, the `copy` flag is true and typically represents a perfect copy of a source was made.
///
/// This variant can only be encountered if [rewrite tracking](super::Options::rewrites) is enabled.
///
/// Note that mode changes may have occurred as well, i.e. changes from executable to non-executable or vice-versa.
Rewrite {
/// The location of the source of the rename or copy operation.
///
/// It may be empty if [file names](super::Options::location) is `None`.
/// are tracked.
source_location: &'a BStr,
/// The mode of the entry before the rename.
source_entry_mode: gix_object::tree::EntryMode,
/// Identifies a relationship between the source and another source,
/// making it easy to reconstruct the top-level of directory changes.
source_relation: Option<tree::visit::Relation>,
/// The object id of the entry before the rename.
///
/// Note that this is the same as `id` if we require the [similarity to be 100%](super::Rewrites::percentage), but may
/// be different otherwise.
source_id: gix_hash::ObjectId,
/// Information about the diff we performed to detect similarity and match the `source_id` with the current state at `id`.
/// It's `None` if `source_id` is equal to `id`, as identity made an actual diff computation unnecessary.
diff: Option<DiffLineStats>,
/// The mode of the entry after the rename.
/// It could differ but still be considered a rename as we are concerned only about content.
entry_mode: gix_object::tree::EntryMode,
/// The object id after the rename.
id: gix_hash::ObjectId,
/// The location after the rename or copy operation.
///
/// It may be empty if [file names](super::Options::location) is `None`.
location: &'a BStr,
/// Identifies a relationship between this destination and another destination,
/// making it easy to reconstruct the top-level of directory changes.
relation: Option<tree::visit::Relation>,
/// If true, this rewrite is created by copy, and `source_id` is pointing to its source. Otherwise, it's a rename, and `source_id`
/// points to a deleted object, as renames are tracked as deletions and additions of the same or similar content.
copy: bool,
},
}
/// Represents any possible change in order to turn one tree into another, with fully-owned data.
#[derive(Debug, Clone)]
pub enum Change {
/// An entry was added, like the addition of a file or directory.
Addition {
/// The location of the file or directory.
///
/// It may be empty if [file names](super::Options::location) is `None`.
location: BString,
/// Identifies a relationship between this instance and another one,
/// making it easy to reconstruct the top-level of directory changes.
relation: Option<tree::visit::Relation>,
/// The mode of the added entry.
entry_mode: gix_object::tree::EntryMode,
/// The object id of the added entry.
id: gix_hash::ObjectId,
},
/// An entry was deleted, like the deletion of a file or directory.
Deletion {
/// The location of the file or directory.
///
/// It may be empty if [file names](super::Options::location) is `None`.
location: BString,
/// Identifies a relationship between this instance and another one,
/// making it easy to reconstruct the top-level of directory changes.
relation: Option<tree::visit::Relation>,
/// The mode of the deleted entry.
entry_mode: gix_object::tree::EntryMode,
/// The object id of the deleted entry.
id: gix_hash::ObjectId,
},
/// An entry was modified, e.g. changing the contents of a file adjusts its object id and turning
/// a file into a symbolic link adjusts its mode.
Modification {
/// The location of the file or directory.
///
/// It may be empty if [file names](super::Options::location) is `None`.
location: BString,
/// The mode of the entry before the modification.
previous_entry_mode: gix_object::tree::EntryMode,
/// The object id of the entry before the modification.
previous_id: gix_hash::ObjectId,
/// The mode of the entry after the modification.
entry_mode: gix_object::tree::EntryMode,
/// The object id after the modification.
id: gix_hash::ObjectId,
},
/// Entries are considered rewritten if they are not trees and they, according to some understanding of identity, were renamed
/// or copied.
/// In case of renames, this means they originally appeared as [`Deletion`](ChangeRef::Deletion) signalling their source as well as an
/// [`Addition`](ChangeRef::Addition) acting as destination.
///
/// In case of copies, the `copy` flag is true and typically represents a perfect copy of a source was made.
///
/// This variant can only be encountered if [rewrite tracking](super::Options::rewrites) is enabled.
///
/// Note that mode changes may have occurred as well, i.e. changes from executable to non-executable or vice-versa.
Rewrite {
/// The location of the source of the rename operation.
///
/// It may be empty if [file names](super::Options::location) is `None`.
source_location: BString,
/// The mode of the entry before the rename.
source_entry_mode: gix_object::tree::EntryMode,
/// Identifies a relationship between the source and another source,
/// making it easy to reconstruct the top-level of directory changes.
source_relation: Option<tree::visit::Relation>,
/// The object id of the entry before the rename.
///
/// Note that this is the same as `id` if we require the [similarity to be 100%](super::Rewrites::percentage), but may
/// be different otherwise.
source_id: gix_hash::ObjectId,
/// Information about the diff we performed to detect similarity and match the `source_id` with the current state at `id`.
/// It's `None` if `source_id` is equal to `id`, as identity made an actual diff computation unnecessary.
diff: Option<DiffLineStats>,
/// The mode of the entry after the rename.
/// It could differ but still be considered a rename as we are concerned only about content.
entry_mode: gix_object::tree::EntryMode,
/// The object id after the rename.
id: gix_hash::ObjectId,
/// The location after the rename or copy operation.
///
/// It may be empty if [file names](super::Options::location) is `None`.
location: BString,
/// Identifies a relationship between this destination and another destination,
/// making it easy to reconstruct the top-level of directory changes.
relation: Option<tree::visit::Relation>,
/// If true, this rewrite is created by copy, and `source_id` is pointing to its source. Otherwise, it's a rename, and `source_id`
/// points to a deleted object, as renames are tracked as deletions and additions of the same or similar content.
copy: bool,
},
}
/// Lifecycle
impl ChangeRef<'_> {
/// Copy this instance into a fully-owned version
pub fn into_owned(self) -> Change {
match self {
ChangeRef::Addition {
location,
entry_mode,
id,
relation,
} => Change::Addition {
location: location.to_owned(),
entry_mode,
id,
relation,
},
ChangeRef::Deletion {
location,
entry_mode,
id,
relation,
} => Change::Deletion {
location: location.to_owned(),
entry_mode,
id,
relation,
},
ChangeRef::Modification {
location,
previous_entry_mode,
previous_id,
entry_mode,
id,
} => Change::Modification {
location: location.to_owned(),
previous_entry_mode,
previous_id,
entry_mode,
id,
},
ChangeRef::Rewrite {
source_location,
source_relation,
source_entry_mode,
source_id,
diff,
entry_mode,
id,
location,
relation,
copy,
} => Change::Rewrite {
source_location: source_location.to_owned(),
source_relation,
source_entry_mode,
source_id,
diff,
entry_mode,
id,
location: location.to_owned(),
relation,
copy,
},
}
}
}
/// Lifecycle
impl Change {
/// Return an attached version of this instance that uses `old_repo` for previous values and `new_repo` for current values.
pub fn to_ref(&self) -> ChangeRef<'_> {
match self {
Change::Addition {
location,
relation,
entry_mode,
id,
} => ChangeRef::Addition {
location: location.as_bstr(),
entry_mode: *entry_mode,
id: *id,
relation: *relation,
},
Change::Deletion {
location,
relation,
entry_mode,
id,
} => ChangeRef::Deletion {
location: location.as_bstr(),
entry_mode: *entry_mode,
id: *id,
relation: *relation,
},
Change::Modification {
location,
previous_entry_mode,
previous_id,
entry_mode,
id,
} => ChangeRef::Modification {
location: location.as_bstr(),
previous_entry_mode: *previous_entry_mode,
previous_id: *previous_id,
entry_mode: *entry_mode,
id: *id,
},
Change::Rewrite {
source_location,
source_relation,
source_entry_mode,
source_id,
diff,
entry_mode,
id,
location,
relation,
copy,
} => ChangeRef::Rewrite {
source_location: source_location.as_ref(),
source_relation: *source_relation,
source_entry_mode: *source_entry_mode,
source_id: *source_id,
diff: *diff,
entry_mode: *entry_mode,
id: *id,
location: location.as_bstr(),
relation: *relation,
copy: *copy,
},
}
}
}
impl crate::blob::Platform {
/// Set ourselves up to produces blob-diffs from `change`, so this platform can be used to produce diffs easily.
/// `objects` are used to fetch object data as needed.
///
/// ### Warning about Memory Consumption
///
/// This instance only grows, so one should call [`crate::blob::Platform::clear_resource_cache`] occasionally.
pub fn set_resource_by_change(
&mut self,
change: ChangeRef<'_>,
objects: &impl gix_object::FindObjectOrHeader,
) -> Result<&mut Self, crate::blob::platform::set_resource::Error> {
match change {
ChangeRef::Addition {
location,
relation: _,
entry_mode,
id,
} => {
self.set_resource(
id.kind().null(),
entry_mode.kind(),
location,
ResourceKind::OldOrSource,
objects,
)?;
self.set_resource(id, entry_mode.kind(), location, ResourceKind::NewOrDestination, objects)?;
}
ChangeRef::Deletion {
location,
relation: _,
entry_mode,
id,
} => {
self.set_resource(id, entry_mode.kind(), location, ResourceKind::OldOrSource, objects)?;
self.set_resource(
id.kind().null(),
entry_mode.kind(),
location,
ResourceKind::NewOrDestination,
objects,
)?;
}
ChangeRef::Modification {
location,
previous_entry_mode,
previous_id,
entry_mode,
id,
} => {
self.set_resource(
previous_id,
previous_entry_mode.kind(),
location,
ResourceKind::OldOrSource,
objects,
)?;
self.set_resource(id, entry_mode.kind(), location, ResourceKind::NewOrDestination, objects)?;
}
ChangeRef::Rewrite {
source_location,
source_relation: _,
source_entry_mode,
source_id,
entry_mode,
id,
location,
relation: _,
diff: _,
copy: _,
} => {
self.set_resource(
source_id,
source_entry_mode.kind(),
source_location,
ResourceKind::OldOrSource,
objects,
)?;
self.set_resource(id, entry_mode.kind(), location, ResourceKind::NewOrDestination, objects)?;
}
}
Ok(self)
}
}
impl<'a> ChangeRef<'a> {
/// Return the relation this instance may have to other changes.
pub fn relation(&self) -> Option<tree::visit::Relation> {
match self {
ChangeRef::Addition { relation, .. }
| ChangeRef::Deletion { relation, .. }
| ChangeRef::Rewrite { relation, .. } => *relation,
ChangeRef::Modification { .. } => None,
}
}
/// Return the current mode of this instance.
pub fn entry_mode(&self) -> gix_object::tree::EntryMode {
match self {
ChangeRef::Addition { entry_mode, .. }
| ChangeRef::Deletion { entry_mode, .. }
| ChangeRef::Modification { entry_mode, .. }
| ChangeRef::Rewrite { entry_mode, .. } => *entry_mode,
}
}
/// Return the *current* location of the resource, i.e. the destination of a rename or copy, or the
/// location at which an addition, deletion or modification took place.
pub fn location(&self) -> &'a BStr {
match self {
ChangeRef::Addition { location, .. }
| ChangeRef::Deletion { location, .. }
| ChangeRef::Modification { location, .. }
| ChangeRef::Rewrite { location, .. } => location,
}
}
}
impl Change {
/// Return the relation this instance may have to other changes.
pub fn relation(&self) -> Option<tree::visit::Relation> {
match self {
Change::Addition { relation, .. }
| Change::Deletion { relation, .. }
| Change::Rewrite { relation, .. } => *relation,
Change::Modification { .. } => None,
}
}
/// Return the current mode of this instance.
pub fn entry_mode(&self) -> gix_object::tree::EntryMode {
match self {
Change::Addition { entry_mode, .. }
| Change::Deletion { entry_mode, .. }
| Change::Modification { entry_mode, .. }
| Change::Rewrite { entry_mode, .. } => *entry_mode,
}
}
/// Return the *current* location of the resource, i.e. the destination of a rename or copy, or the
/// location at which an addition, deletion or modification took place.
pub fn location(&self) -> &BStr {
match self {
Change::Addition { location, .. }
| Change::Deletion { location, .. }
| Change::Modification { location, .. }
| Change::Rewrite { location, .. } => location.as_bstr(),
}
}
}