Show (git) diff signs in gutter (#3890)

* Show (git) diff signs in gutter (#3890)

Avoid string allocation when git diffing

Incrementally diff using changesets

refactor diffs to be provider indepndent and improve git implementation

remove dependency on zlib-ng

switch to asynchronus diffing with similar

Update helix-vcs/Cargo.toml

fix toml formatting

Co-authored-by: Ivan Tham <pickfire@riseup.net>

fix typo in documentation

use ropey reexpors from helix-core

fix crash when creating new file

remove useless use if io::Cursor

fix spelling mistakes

implement suggested improvement to repository loading

improve git test isolation

remove lefover comments

Co-authored-by: univerz <univerz@fu-solution.com>

fixed spelling mistake

minor cosmetic changes

fix: set self.differ to None if decoding the diff_base fails

fixup formatting

Co-authored-by: Ivan Tham <pickfire@riseup.net>

reload diff_base when file is reloaded from disk

switch to imara-diff

Fixup formatting

Co-authored-by: Blaž Hrastnik <blaz@mxxn.io>

Redraw buffer whenever a diff is updated.

Only store hunks instead of changes for individual lines to easily allow
jumping between them

Update to latest gitoxide version

Change default diff gutter position

Only update gutter after timeout

* update diff gutter synchronously, with a timeout

* Apply suggestions from code review

Co-authored-by: Blaž Hrastnik <blaz@mxxn.io>
Co-authored-by: Michael Davis <mcarsondavis@gmail.com>

* address review comments and ensure lock is always aquired

* remove configuration for redraw timeout

Co-authored-by: Blaž Hrastnik <blaz@mxxn.io>
Co-authored-by: Michael Davis <mcarsondavis@gmail.com>

1 files changed, 149 insertions, 0 deletions

diff --git a/helix-vcs/src/diff/worker/test.rs b/helix-vcs/src/diff/worker/test.rs
new file mode 100644
index 00000000..14442426
--- /dev/null
+++ b/helix-vcs/src/diff/worker/test.rs
@@ -0,0 +1,149 @@
+use helix_core::Rope;
+use tokio::task::JoinHandle;
+
+use crate::diff::{DiffHandle, Hunk};
+
+impl DiffHandle {
+    fn new_test(diff_base: &str, doc: &str) -> (DiffHandle, JoinHandle<()>) {
+        DiffHandle::new_with_handle(
+            Rope::from_str(diff_base),
+            Rope::from_str(doc),
+            Default::default(),
+        )
+    }
+    async fn into_diff(self, handle: JoinHandle<()>) -> Vec<Hunk> {
+        let hunks = self.hunks;
+        // dropping the channel terminates the task
+        drop(self.channel);
+        handle.await.unwrap();
+        let hunks = hunks.lock();
+        Vec::clone(&*hunks)
+    }
+}
+
+#[tokio::test]
+async fn append_line() {
+    let (differ, handle) = DiffHandle::new_test("foo\n", "foo\nbar\n");
+    let line_diffs = differ.into_diff(handle).await;
+    assert_eq!(
+        &line_diffs,
+        &[Hunk {
+            before: 1..1,
+            after: 1..2
+        }]
+    )
+}
+
+#[tokio::test]
+async fn prepend_line() {
+    let (differ, handle) = DiffHandle::new_test("foo\n", "bar\nfoo\n");
+    let line_diffs = differ.into_diff(handle).await;
+    assert_eq!(
+        &line_diffs,
+        &[Hunk {
+            before: 0..0,
+            after: 0..1
+        }]
+    )
+}
+
+#[tokio::test]
+async fn modify() {
+    let (differ, handle) = DiffHandle::new_test("foo\nbar\n", "foo bar\nbar\n");
+    let line_diffs = differ.into_diff(handle).await;
+    assert_eq!(
+        &line_diffs,
+        &[Hunk {
+            before: 0..1,
+            after: 0..1
+        }]
+    )
+}
+
+#[tokio::test]
+async fn delete_line() {
+    let (differ, handle) = DiffHandle::new_test("foo\nfoo bar\nbar\n", "foo\nbar\n");
+    let line_diffs = differ.into_diff(handle).await;
+    assert_eq!(
+        &line_diffs,
+        &[Hunk {
+            before: 1..2,
+            after: 1..1
+        }]
+    )
+}
+
+#[tokio::test]
+async fn delete_line_and_modify() {
+    let (differ, handle) = DiffHandle::new_test("foo\nbar\ntest\nfoo", "foo\ntest\nfoo bar");
+    let line_diffs = differ.into_diff(handle).await;
+    assert_eq!(
+        &line_diffs,
+        &[
+            Hunk {
+                before: 1..2,
+                after: 1..1
+            },
+            Hunk {
+                before: 3..4,
+                after: 2..3
+            },
+        ]
+    )
+}
+
+#[tokio::test]
+async fn add_use() {
+    let (differ, handle) = DiffHandle::new_test(
+        "use ropey::Rope;\nuse tokio::task::JoinHandle;\n",
+        "use ropey::Rope;\nuse ropey::RopeSlice;\nuse tokio::task::JoinHandle;\n",
+    );
+    let line_diffs = differ.into_diff(handle).await;
+    assert_eq!(
+        &line_diffs,
+        &[Hunk {
+            before: 1..1,
+            after: 1..2
+        },]
+    )
+}
+
+#[tokio::test]
+async fn update_document() {
+    let (differ, handle) = DiffHandle::new_test("foo\nbar\ntest\nfoo", "foo\nbar\ntest\nfoo");
+    differ.update_document(Rope::from_str("foo\ntest\nfoo bar"), false);
+    let line_diffs = differ.into_diff(handle).await;
+    assert_eq!(
+        &line_diffs,
+        &[
+            Hunk {
+                before: 1..2,
+                after: 1..1
+            },
+            Hunk {
+                before: 3..4,
+                after: 2..3
+            },
+        ]
+    )
+}
+
+#[tokio::test]
+async fn update_base() {
+    let (differ, handle) = DiffHandle::new_test("foo\ntest\nfoo bar", "foo\ntest\nfoo bar");
+    differ.update_diff_base(Rope::from_str("foo\nbar\ntest\nfoo"));
+    let line_diffs = differ.into_diff(handle).await;
+    assert_eq!(
+        &line_diffs,
+        &[
+            Hunk {
+                before: 1..2,
+                after: 1..1
+            },
+            Hunk {
+                before: 3..4,
+                after: 2..3
+            },
+        ]
+    )
+}