Refactor CodeDiff

app/src/components/Sidebar/CodeDiff/util.tsx

@@ -0,0 +1,33 @@
+export function trimNewlineRight(str: string) {
+  if (str.slice(-1) === '\n') {
+    return str.slice(0, -1)
+  }
+
+  return str
+}
+
+const gutterBaseStyle = {
+  width: '100%',
+}
+
+const additionStyle = {
+  ...gutterBaseStyle,
+  backgroundColor: 'rgba(10, 255, 10, 0.3)',
+}
+
+const deletionStyle = {
+  ...gutterBaseStyle,
+  backgroundColor: 'rgba(255, 10, 10, 0.3)',
+}
+
+export function lineChangeStyle(change: Diff.Change) {
+  if (change.added === true) {
+    return additionStyle
+  }
+
+  if (change.removed === true) {
+    return deletionStyle
+  }
+
+  return gutterBaseStyle
+}