changeset 46063:dacb771f6dd2

copies-rust: extract the processing of a ChangedFiles in its own function This is a reasonably independent piece of code that we can extract in its own function. This extraction will be very useful for the next changeset, where we will change the iteration order (but still do the same kind of processing). Differential Revision: https://phab.mercurial-scm.org/D9421
author Pierre-Yves David <pierre-yves.david@octobus.net>
date Fri, 20 Nov 2020 14:17:08 +0100
parents 12192fdbf3ac
children 24751551fe64
files rust/hg-core/src/copy_tracing.rs
diffstat 1 files changed, 52 insertions(+), 40 deletions(-) [+]
line wrap: on
line diff
--- a/rust/hg-core/src/copy_tracing.rs	Fri Nov 20 14:03:40 2020 +0100
+++ b/rust/hg-core/src/copy_tracing.rs	Fri Nov 20 14:17:08 2020 +0100
@@ -360,46 +360,8 @@
                 assert_eq!(rev, p2);
                 Parent::SecondParent
             };
-            let mut new_copies = copies.clone();
-
-            for action in changes.iter_actions(parent) {
-                match action {
-                    Action::Copied(dest, source) => {
-                        let entry;
-                        if let Some(v) = copies.get(source) {
-                            entry = match &v.path {
-                                Some(path) => Some((*(path)).to_owned()),
-                                None => Some(source.to_owned()),
-                            }
-                        } else {
-                            entry = Some(source.to_owned());
-                        }
-                        // Each new entry is introduced by the children, we
-                        // record this information as we will need it to take
-                        // the right decision when merging conflicting copy
-                        // information. See merge_copies_dict for details.
-                        let ttpc = TimeStampedPathCopy {
-                            rev: *child,
-                            path: entry,
-                        };
-                        new_copies.insert(dest.to_owned(), ttpc);
-                    }
-                    Action::Removed(f) => {
-                        // We must drop copy information for removed file.
-                        //
-                        // We need to explicitly record them as dropped to
-                        // propagate this information when merging two
-                        // TimeStampedPathCopies object.
-                        if new_copies.contains_key(f.as_ref()) {
-                            let ttpc = TimeStampedPathCopy {
-                                rev: *child,
-                                path: None,
-                            };
-                            new_copies.insert(f.to_owned(), ttpc);
-                        }
-                    }
-                }
-            }
+            let new_copies =
+                add_from_changes(&copies, &changes, parent, *child);
 
             // Merge has two parents needs to combines their copy information.
             //
@@ -441,6 +403,56 @@
     result
 }
 
+/// Combine ChangedFiles with some existing PathCopies information and return
+/// the result
+fn add_from_changes(
+    base_copies: &TimeStampedPathCopies,
+    changes: &ChangedFiles,
+    parent: Parent,
+    current_rev: Revision,
+) -> TimeStampedPathCopies {
+    let mut copies = base_copies.clone();
+    for action in changes.iter_actions(parent) {
+        match action {
+            Action::Copied(dest, source) => {
+                let entry;
+                if let Some(v) = base_copies.get(source) {
+                    entry = match &v.path {
+                        Some(path) => Some((*(path)).to_owned()),
+                        None => Some(source.to_owned()),
+                    }
+                } else {
+                    entry = Some(source.to_owned());
+                }
+                // Each new entry is introduced by the children, we
+                // record this information as we will need it to take
+                // the right decision when merging conflicting copy
+                // information. See merge_copies_dict for details.
+                let ttpc = TimeStampedPathCopy {
+                    rev: current_rev,
+                    path: entry,
+                };
+                copies.insert(dest.to_owned(), ttpc);
+            }
+            Action::Removed(f) => {
+                // We must drop copy information for removed file.
+                //
+                // We need to explicitly record them as dropped to
+                // propagate this information when merging two
+                // TimeStampedPathCopies object.
+                if copies.contains_key(f.as_ref()) {
+                    let ttpc = TimeStampedPathCopy {
+                        rev: current_rev,
+                        path: None,
+                    };
+                    copies.insert(f.to_owned(), ttpc);
+                }
+            }
+        }
+    }
+    copies
+}
+
 /// merge two copies-mapping together, minor and major
 ///
 /// In case of conflict, value from "major" will be picked, unless in some