1 files changed, 9 insertions, 1 deletions
diff --git a/src/main/kotlin/moe/nea/blog/md/LinePreProcessor.kt b/src/main/kotlin/moe/nea/blog/md/LinePreProcessor.kt
index cb9d81f..7938cbe 100644
--- a/src/main/kotlin/moe/nea/blog/md/LinePreProcessor.kt
+++ b/src/main/kotlin/moe/nea/blog/md/LinePreProcessor.kt
@@ -1,5 +1,13 @@
 package moe.nea.blog.md
 
-interface LinePreProcessor {
+fun interface LinePreProcessor {
     fun preprocess(lineIndex: Int, line: String): String?
+
+    companion object {
+        fun whileIgnoringFirst(indent: Int, wrapped: LinePreProcessor): LinePreProcessor {
+            return LinePreProcessor { lineIndex, line ->
+                line.take(indent) + wrapped.preprocess(lineIndex, line.drop(indent))
+            }
+        }
+    }
 }