1 files changed, 25 insertions, 0 deletions
diff --git a/helix-core/src/transaction.rs b/helix-core/src/transaction.rs
new file mode 100644
index 00000000..ecbe0c50
--- /dev/null
+++ b/helix-core/src/transaction.rs
@@ -0,0 +1,25 @@
+pub struct Change {
+    from: usize,
+    to: usize,
+    insert: Option<String>,
+}
+
+impl Change {
+    pub fn new(from: usize, to: usize, insert: Option<String>) {
+        // old_extent, new_extent, insert
+    }
+}
+
+pub struct Transaction {}
+
+// ChangeSpec = Change | ChangeSet | Vec<Change>
+// ChangeDesc as a ChangeSet without text: can't be applied, cheaper to store.
+// ChangeSet = ChangeDesc with Text
+pub struct ChangeSet {
+    // basically Vec<ChangeDesc> where ChangeDesc = (current len, replacement len?)
+    // (0, n>0) for insertion, (n>0, 0) for deletion, (>0, >0) for replacement
+    sections: Vec<(usize, isize)>,
+}
+//
+// trait Transaction
+// trait StrictTransaction