From 86a0bc9ed3d6bc493950575cea8d94e6f6e41cbd Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Daniel=20Mart=C3=AD?= <mvdan@mvdan.cc>
Date: Tue, 14 Nov 2023 20:50:17 +0000
Subject: [PATCH] syntax: support brace expansions with uppercase letters

They clearly work in Bash:

    $ echo test{A..C}
    testA testB testC

Updates #1042.
---
 expand/braces_test.go | 4 ++++
 syntax/braces.go      | 3 ++-
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/expand/braces_test.go b/expand/braces_test.go
index 4743cbe1..2ae4d27d 100644
--- a/expand/braces_test.go
+++ b/expand/braces_test.go
@@ -101,6 +101,10 @@ var braceTests = []struct {
 		litWord("a{c..f}"),
 		litWords("ac", "ad", "ae", "af"),
 	},
+	{
+		litWord("a{H..K}"),
+		litWords("aH", "aI", "aJ", "aK"),
+	},
 	{
 		litWord("a{-..f}"),
 		litWords("a{-..f}"),
diff --git a/syntax/braces.go b/syntax/braces.go
index f3452819..94c64ea8 100644
--- a/syntax/braces.go
+++ b/syntax/braces.go
@@ -110,7 +110,8 @@ func SplitBraces(word *Word) bool {
 					val := elem.Lit()
 					if _, err := strconv.Atoi(val); err == nil {
 					} else if len(val) == 1 &&
-						'a' <= val[0] && val[0] <= 'z' {
+						(('a' <= val[0] && val[0] <= 'z') ||
+							('A' <= val[0] && val[0] <= 'Z')) {
 						chars[i] = true
 					} else {
 						broken = true