feat: add replace_last filter

src/filters/string.ts

@@ -82,6 +82,15 @@ export function replace_first (v: string, arg1: string, arg2: string) {
   return stringify(v).replace(String(arg1), arg2)
 }
 
+export function replace_last (v: string, arg1: string, arg2: string) {
+  const str = stringify(v)
+  const pattern = String(arg1)
+  const index = str.lastIndexOf(pattern)
+  if (index === -1) return str
+  const replacement = String(arg2)
+  return str.substring(0, index) + replacement + str.substring(index + pattern.length)
+}
+
 export function truncate (v: string, l = 50, o = '...') {
   v = stringify(v)
   if (v.length <= l) return v

test/integration/filters/string.ts

@@ -202,4 +202,14 @@ describe('filters/string', function () {
       return test('{{ "1 2 3 4 5 6 7 8 9 a b c d e f" | truncatewords }}', '1 2 3 4 5 6 7 8 9 a b c d e f...')
     })
   })
+  describe('replace_last', function () {
+    it('should replace the last occurrence of substring', function () {
+      return test('{{ "Take my protein pills and put my helmet on" | replace_last: "my", "your" }}',
+        'Take my protein pills and put your helmet on')
+    })
+    it('should handle substring not found', function () {
+      return test('{{ "Take my protein pills and put my helmet on" | replace_last: "nosuchthing", "your" }}',
+        'Take my protein pills and put my helmet on')
+    })
+  })
 })