Optimization for IsDirty()

cmd/micro/buffer.go

@@ -19,7 +19,8 @@ type Buffer struct {
 	name string
 
 	// This is the text stored every time the buffer is saved to check if the buffer is modified
-	savedText string
+	savedText     string
+	netInsertions int
 
 	// Provide efficient and easy access to text and lines so the rope String does not
 	// need to be constantly recalculated
@@ -84,11 +85,15 @@ func (b *Buffer) SaveAs(filename string) error {
 
 // IsDirty returns whether or not the buffer has been modified compared to the one on disk
 func (b *Buffer) IsDirty() bool {
-	return b.savedText != b.text
+	if b.netInsertions == 0 {
+		return b.savedText != b.text
+	}
+	return true
 }
 
 // Insert a string into the rope
 func (b *Buffer) Insert(idx int, value string) {
+	b.netInsertions += len(value)
 	b.r = b.r.Insert(idx, value)
 	b.Update()
 }
@@ -96,6 +101,7 @@ func (b *Buffer) Insert(idx int, value string) {
 // Remove a slice of the rope from start to end (exclusive)
 // Returns the string that was removed
 func (b *Buffer) Remove(start, end int) string {
+	b.netInsertions -= end - start
 	if start < 0 {
 		start = 0
 	}