From dc0db358abe19481e475e10c32149b53370f1a1c Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Thu, 30 May 2024 05:57:31 +0200
Subject: Merging upstream version 1.72.1+dfsg1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 vendor/gix-commitgraph/src/access.rs | 97 ++++++++++++++++++++++++++++++++++++
 1 file changed, 97 insertions(+)
 create mode 100644 vendor/gix-commitgraph/src/access.rs

(limited to 'vendor/gix-commitgraph/src/access.rs')

diff --git a/vendor/gix-commitgraph/src/access.rs b/vendor/gix-commitgraph/src/access.rs
new file mode 100644
index 000000000..ce3688f78
--- /dev/null
+++ b/vendor/gix-commitgraph/src/access.rs
@@ -0,0 +1,97 @@
+use crate::{file, file::Commit, File, Graph, Position};
+
+/// Access
+impl Graph {
+    /// Returns the commit at the given position `pos`.
+    ///
+    /// # Panics
+    /// If `pos` is greater or equal to [`num_commits()`][Graph::num_commits()].
+    pub fn commit_at(&self, pos: Position) -> Commit<'_> {
+        let r = self.lookup_by_pos(pos);
+        r.file.commit_at(r.pos)
+    }
+
+    /// Returns the commit matching the given `id`.
+    pub fn commit_by_id(&self, id: impl AsRef<gix_hash::oid>) -> Option<Commit<'_>> {
+        let r = self.lookup_by_id(id.as_ref())?;
+        Some(r.file.commit_at(r.file_pos))
+    }
+
+    /// Returns the `hash` at the given position `pos`.
+    ///
+    /// # Panics
+    /// If `pos` is greater or equal to [`num_commits()`][Graph::num_commits()].
+    pub fn id_at(&self, pos: Position) -> &gix_hash::oid {
+        let r = self.lookup_by_pos(pos);
+        r.file.id_at(r.pos)
+    }
+
+    /// Iterate over commits in unsorted order.
+    pub fn iter_commits(&self) -> impl Iterator<Item = Commit<'_>> {
+        self.files.iter().flat_map(|file| file.iter_commits())
+    }
+
+    /// Iterate over commit IDs in unsorted order.
+    pub fn iter_ids(&self) -> impl Iterator<Item = &gix_hash::oid> {
+        self.files.iter().flat_map(|file| file.iter_ids())
+    }
+
+    /// Translate the given `id` to its position in the file.
+    pub fn lookup(&self, id: impl AsRef<gix_hash::oid>) -> Option<Position> {
+        Some(self.lookup_by_id(id.as_ref())?.graph_pos)
+    }
+
+    /// Returns the number of commits stored in this file.
+    pub fn num_commits(&self) -> u32 {
+        self.files.iter().map(|f| f.num_commits()).sum()
+    }
+}
+
+/// Access fundamentals
+impl Graph {
+    fn lookup_by_id(&self, id: &gix_hash::oid) -> Option<LookupByIdResult<'_>> {
+        let mut current_file_start = 0;
+        for file in &self.files {
+            if let Some(lex_pos) = file.lookup(id) {
+                return Some(LookupByIdResult {
+                    file,
+                    file_pos: lex_pos,
+                    graph_pos: Position(current_file_start + lex_pos.0),
+                });
+            }
+            current_file_start += file.num_commits();
+        }
+        None
+    }
+
+    fn lookup_by_pos(&self, pos: Position) -> LookupByPositionResult<'_> {
+        let mut remaining = pos.0;
+        for (file_index, file) in self.files.iter().enumerate() {
+            match remaining.checked_sub(file.num_commits()) {
+                Some(v) => remaining = v,
+                None => {
+                    return LookupByPositionResult {
+                        file,
+                        _file_index: file_index,
+                        pos: file::Position(remaining),
+                    }
+                }
+            }
+        }
+        panic!("graph position too large: {}", pos.0);
+    }
+}
+
+#[derive(Clone)]
+struct LookupByIdResult<'a> {
+    pub file: &'a File,
+    pub graph_pos: Position,
+    pub file_pos: file::Position,
+}
+
+#[derive(Clone)]
+struct LookupByPositionResult<'a> {
+    pub file: &'a File,
+    pub _file_index: usize,
+    pub pos: file::Position,
+}
-- 
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