From 38f512d588db1c9d1c7352705bb57d4f066ede64 Mon Sep 17 00:00:00 2001
From: bluthej <joffrey.bluthe@e.email>
Date: Mon, 9 Oct 2023 09:28:13 +0200
Subject: [PATCH] Fix diff (old and new were reversed) (#7855)

## Summary

Fixes #7853.

The old and new source files were reversed in the call to
`TextDiff::from_lines`, so the diff output of the CLI was also reversed.

## Test Plan

Two snapshots were updated in the process, so any reversal should be
caught :)
---
 crates/ruff_cli/tests/integration_test.rs | 12 ++++++------
 crates/ruff_linter/src/source_kind.rs     |  2 +-
 2 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/crates/ruff_cli/tests/integration_test.rs b/crates/ruff_cli/tests/integration_test.rs
index 07275021c8f22..7937af211cab3 100644
--- a/crates/ruff_cli/tests/integration_test.rs
+++ b/crates/ruff_cli/tests/integration_test.rs
@@ -1111,8 +1111,8 @@ fn diff_shows_safe_fixes_by_default() {
     ----- stdout -----
     @@ -1,2 +1,2 @@
      x = {'a': 1, 'a': 1}
-    -print('foo')
-    +print(('foo'))
+    -print(('foo'))
+    +print('foo')
 
 
     ----- stderr -----
@@ -1142,10 +1142,10 @@ fn diff_shows_unsafe_fixes_with_opt_in() {
     exit_code: 1
     ----- stdout -----
     @@ -1,2 +1,2 @@
-    -x = {'a': 1}
-    -print('foo')
-    +x = {'a': 1, 'a': 1}
-    +print(('foo'))
+    -x = {'a': 1, 'a': 1}
+    -print(('foo'))
+    +x = {'a': 1}
+    +print('foo')
 
 
     ----- stderr -----
diff --git a/crates/ruff_linter/src/source_kind.rs b/crates/ruff_linter/src/source_kind.rs
index c98b5fc50ae33..1cca0017bbdaf 100644
--- a/crates/ruff_linter/src/source_kind.rs
+++ b/crates/ruff_linter/src/source_kind.rs
@@ -91,7 +91,7 @@ impl SourceKind {
     pub fn diff(&self, other: &Self, path: Option<&Path>, writer: &mut dyn Write) -> Result<()> {
         match (self, other) {
             (SourceKind::Python(src), SourceKind::Python(dst)) => {
-                let text_diff = TextDiff::from_lines(dst, src);
+                let text_diff = TextDiff::from_lines(src, dst);
                 let mut unified_diff = text_diff.unified_diff();
 
                 if let Some(path) = path {