GitDiff: unified diff viewer + PR diffs

Author: nicosuave

macos/Sources/Features/GitDiff/DiffModels.swift

@@ -0,0 +1,78 @@
+import Foundation
+
+enum DiffDocumentSource: Hashable {
+    case workingTree(scope: GitDiffScope)
+    case pullRequest(number: Int)
+}
+
+struct DiffDocument: Hashable {
+    var source: DiffDocumentSource
+    var files: [DiffFile]
+}
+
+enum DiffFileStatus: String, Hashable {
+    case modified
+    case added
+    case deleted
+    case renamed
+    case copied
+    case binary
+    case combinedUnsupported
+    case unknown
+}
+
+struct DiffFile: Identifiable, Hashable {
+    let pathOld: String?
+    let pathNew: String?
+    let status: DiffFileStatus
+    let additions: Int
+    let deletions: Int
+    let hunks: [DiffHunk]
+
+    // Used for binary diffs and unsupported combined diffs.
+    let fallbackText: String?
+    let isTooLargeToRender: Bool
+
+    var id: String { primaryPath }
+
+    var primaryPath: String {
+        (pathNew?.isEmpty == false ? pathNew : nil)
+            ?? (pathOld?.isEmpty == false ? pathOld : nil)
+            ?? "Diff"
+    }
+
+    var displayTitle: String {
+        guard let pathOld, let pathNew, !pathOld.isEmpty, !pathNew.isEmpty, pathOld != pathNew else {
+            return primaryPath
+        }
+        return "\(pathNew) \u{2190} \(pathOld)"
+    }
+
+    var isBinary: Bool { status == .binary }
+    var isCombinedUnsupported: Bool { status == .combinedUnsupported }
+}
+
+struct DiffHunk: Identifiable, Hashable {
+    let id: String
+    let header: String
+    let oldStart: Int
+    let oldCount: Int
+    let newStart: Int
+    let newCount: Int
+    let lines: [DiffLine]
+}
+
+enum DiffLineKind: Hashable {
+    case context
+    case add
+    case del
+    case meta
+}
+
+struct DiffLine: Identifiable, Hashable {
+    let id: String
+    let kind: DiffLineKind
+    let oldLine: Int?
+    let newLine: Int?
+    let text: String
+}