From ae429cd78a1f52272d5f51991ebb9b04b542ce01 Mon Sep 17 00:00:00 2001
From: "Kartik K. Agaram" <vc@akkartik.com>
Date: Fri, 17 Mar 2023 21:18:17 -0700
Subject: bring a few things in sync between run and source

---
 source_text.lua | 24 ++++++++++++++++++++----
 1 file changed, 20 insertions(+), 4 deletions(-)

(limited to 'source_text.lua')

diff --git a/source_text.lua b/source_text.lua
index 7c00191..1a43842 100644
--- a/source_text.lua
+++ b/source_text.lua
@@ -1721,10 +1721,26 @@ function rtrim(s)
   return s:gsub('%s+$', '')
 end
 
-function starts_with(s, sub)
-  return s:find(sub, 1, --[[no escapes]] true) == 1
+function starts_with(s, prefix)
+  if #s < #prefix then
+    return false
+  end
+  for i=1,#prefix do
+    if s:sub(i,i) ~= prefix:sub(i,i) then
+      return false
+    end
+  end
+  return true
 end
 
-function ends_with(s, sub)
-  return s:reverse():find(sub:reverse(), 1, --[[no escapes]] true) == 1
+function ends_with(s, suffix)
+  if #s < #suffix then
+    return false
+  end
+  for i=0,#suffix-1 do
+    if s:sub(#s-i,#s-i) ~= suffix:sub(#suffix-i,#suffix-i) then
+      return false
+    end
+  end
+  return true
 end
-- 
cgit 1.4.1-2-gfad0