From 81a302b197caff599ed82fb3ccda19089a6c1cb4 Mon Sep 17 00:00:00 2001
From: Miran <narimiran@disroot.org>
Date: Fri, 30 Oct 2020 10:04:53 +0100
Subject: [PATCH] fix `toHex` - make it work with int literals (#15770)

(cherry picked from commit c0fdc8b215b02736cdb1c275a92b1d5a513f8bad)
---
 lib/pure/strutils.nim | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/lib/pure/strutils.nim b/lib/pure/strutils.nim
index 20ad2f5174..94bdafc106 100644
--- a/lib/pure/strutils.nim
+++ b/lib/pure/strutils.nim
@@ -981,6 +981,18 @@ proc toHex*(x: BiggestInt, len: Positive): string {.noSideEffect,
     doAssert c.toHex(6) == "FFFFF8"
   toHexImpl(cast[BiggestUInt](x), len, x < 0)
 
+proc toHex*(x: int, len: Positive): string {.noSideEffect.} =
+  ## Converts `x` to its hexadecimal representation.
+  ##
+  ## The resulting string will be exactly `len` characters long. No prefix like
+  ## ``0x`` is generated. `x` is treated as an unsigned value.
+  runnableExamples:
+    doAssert toHex(62, 3) == "03E"
+    doAssert toHex(4097, 3) == "001"
+    doAssert toHex(4097, 4) == "1001"
+    doAssert toHex(-8, 6) == "FFFFF8"
+  toHexImpl(cast[BiggestUInt](x), len, x < 0)
+
 proc toHex*[T: SomeInteger](x: T): string {.noSideEffect.} =
   ## Shortcut for ``toHex(x, T.sizeof * 2)``
   runnableExamples: