feat: add remove_last filter

src/filters/string.ts

@@ -39,6 +39,14 @@ export function remove_first (v: string, l: string) {
   return stringify(v).replace(String(l), '')
 }
 
+export function remove_last (v: string, l: string) {
+  const str = stringify(v)
+  const pattern = String(l)
+  const index = str.lastIndexOf(pattern)
+  if (index === -1) return str
+  return str.substring(0, index) + str.substring(index + pattern.length + 1)
+}
+
 export function rstrip (str: string, chars?: string) {
   if (chars) {
     chars = escapeRegExp(stringify(chars))

test/integration/filters/string.ts

@@ -202,13 +202,23 @@ 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('remove_last', function () {
+    it('should remove the last occurrence of substring', function () {
+      return test('{{ "I strained to see the train through the rain" | remove_last: "rain" }}',
+        'I strained to see the train through the ')
+    })
+    it('should handle substring not found', function () {
+      return test('{{ "I strained to see the train through the rain" | remove_last: "no such thing" }}',
+        'I strained to see the train through the rain')
+    })
+  })
   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" }}',
+      return test('{{ "Take my protein pills and put my helmet on" | replace_last: "no such thing", "your" }}',
         'Take my protein pills and put my helmet on')
     })
   })