Replace last usages of difference with dissimilar

Cargo.lock

@@ -342,12 +342,6 @@ dependencies = [
  "lazy_static",
 ]
 
-[[package]]
-name = "difference"
-version = "2.0.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "524cbf6897b527295dff137cec09ecf3a05f4fddffd7dfcd1585403449e74198"
-
 [[package]]
 name = "dissimilar"
 version = "1.0.2"
@@ -1170,7 +1164,6 @@ name = "proc_macro_srv"
 version = "0.0.0"
 dependencies = [
  "cargo_metadata",
- "difference",
  "libloading",
  "mbe",
  "memmap",
@@ -1621,7 +1614,7 @@ dependencies = [
 name = "test_utils"
 version = "0.0.0"
 dependencies = [
- "difference",
+ "dissimilar",
  "rustc-hash",
  "serde_json",
  "stdx",

crates/proc_macro_srv/Cargo.toml

@@ -21,7 +21,6 @@ test_utils = { path = "../test_utils", version = "0.0.0" }
 
 [dev-dependencies]
 cargo_metadata = "=0.12.0"
-difference = "2.0.0"
 
 # used as proc macro test targets
 serde_derive = "1.0.106"

crates/test_utils/Cargo.toml

@@ -11,7 +11,7 @@ doctest = false
 
 [dependencies]
 # Avoid adding deps here, this crate is widely used in tests it should compile fast!
-difference = "2.0.0"
+dissimilar = "1.0.2"
 text-size = "1.0.0"
 serde_json = "1.0.48"
 rustc-hash = "1.1.0"

crates/test_utils/src/lib.rs

@@ -20,7 +20,7 @@ use serde_json::Value;
 use stdx::lines_with_ends;
 use text_size::{TextRange, TextSize};
 
-pub use difference::Changeset as __Changeset;
+pub use dissimilar::diff as __diff;
 pub use rustc_hash::FxHashMap;
 
 pub use crate::fixture::Fixture;
@@ -45,8 +45,8 @@ macro_rules! assert_eq_text {
             if left.trim() == right.trim() {
                 std::eprintln!("Left:\n{:?}\n\nRight:\n{:?}\n\nWhitespace difference\n", left, right);
             } else {
-                let changeset = $crate::__Changeset::new(left, right, "\n");
-                std::eprintln!("Left:\n{}\n\nRight:\n{}\n\nDiff:\n{}\n", left, right, changeset);
+                let diff = $crate::__diff(left, right);
+                std::eprintln!("Left:\n{}\n\nRight:\n{}\n\nDiff:\n{}\n", left, right, $crate::format_diff(diff));
             }
             std::eprintln!($($tt)*);
             panic!("text differs");
@@ -392,3 +392,16 @@ pub fn project_dir() -> PathBuf {
     let dir = env!("CARGO_MANIFEST_DIR");
     PathBuf::from(dir).parent().unwrap().parent().unwrap().to_owned()
 }
+
+pub fn format_diff(chunks: Vec<dissimilar::Chunk>) -> String {
+    let mut buf = String::new();
+    for chunk in chunks {
+        let formatted = match chunk {
+            dissimilar::Chunk::Equal(text) => text.into(),
+            dissimilar::Chunk::Delete(text) => format!("\x1b[41m{}\x1b[0m", text),
+            dissimilar::Chunk::Insert(text) => format!("\x1b[42m{}\x1b[0m", text),
+        };
+        buf.push_str(&formatted);
+    }
+    buf
+}