From da32711e1a3f7c11e798563dd2f39d4035f33c11 Mon Sep 17 00:00:00 2001
From: Armin Ronacher <armin.ronacher@active-4.com>
Date: Wed, 27 Jan 2021 18:08:36 +0100
Subject: [PATCH] Added DiffHook::apply_to_hook

---
 CHANGELOG.md              |  4 ++++
 src/algorithms/capture.rs | 27 +++++++++++++++++++++++++++
 2 files changed, 31 insertions(+)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index a27ef1f..77f9091 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 All notable changes to similar are documented here.
 
+## 0.5.0
+
+* Add `DiffOp::apply_to_hook` to apply a captured op to a diff hook.
+
 ## 0.4.0
 
 * Change `get_close_matches` to use Python's quick ratio optimization
diff --git a/src/algorithms/capture.rs b/src/algorithms/capture.rs
index c2393cd..537026d 100644
--- a/src/algorithms/capture.rs
+++ b/src/algorithms/capture.rs
@@ -109,6 +109,33 @@ impl DiffOp {
             ),
         }
     }
+
+    /// Apply this operation to a diff hook.
+    pub fn apply_to_hook<D: DiffHook>(&self, d: &mut D) -> Result<(), D::Error> {
+        match *self {
+            DiffOp::Equal {
+                old_index,
+                new_index,
+                len,
+            } => d.equal(old_index, new_index, len),
+            DiffOp::Delete {
+                old_index,
+                old_len,
+                new_index,
+            } => d.delete(old_index, old_len, new_index),
+            DiffOp::Insert {
+                old_index,
+                new_index,
+                new_len,
+            } => d.insert(old_index, new_index, new_len),
+            DiffOp::Replace {
+                old_index,
+                old_len,
+                new_index,
+                new_len,
+            } => d.replace(old_index, old_len, new_index, new_len),
+        }
+    }
 }
 
 /// A [`DiffHook`] that captures all diff operations.