Accept hex codepoints starting with %

Easier to copy/paste something from URL-encoded.

Author: arp242

CHANGELOG.md

@@ -1,3 +1,8 @@
+### unreleased
+
+- Accept hex codepoints starting with a `%` for the `print` command (e.g. `%25`
+  or `%5C`).
+
 ### v2.9.0 (2025-12-16)
 
 - Update to Unicode 17.0.

uni.go

@@ -96,10 +96,10 @@ Commands:
     print [query]    Print characters. The query can be any of the following:
 
                        Codepoint   Specific codepoint, in number formats:
-                                     hexadecimal   U+20, U20, 0x20, x20, 20
-                                     decimal       0d32
-                                     octal         0o40, o40
-                                     binary        0b100000
+                                     hex      U+20, U20, 0x20, x20, 20, %20
+                                     decimal  0d32
+                                     octal    0o40, o40
+                                     binary   0b100000
 
                        Range       Range of codepoints, as "start-end" or
                                    "start..end", using the same notation as

unidata/codepoint.go

@@ -203,7 +203,7 @@ func Find(cp rune) (Codepoint, bool) {
 // The input can be as (case-insensitive):
 //
 //	U+F1, U+00F1, UF1, F1   Unicode codepoint notation (hex)
-//	0xF1, xF1               Hex number
+//	0xF1, xF1, %F1          Hex number
 //	0d241                   Decimal number
 //	0o361, o361             Octal number
 //	0b11110001              Binary number
@@ -224,7 +224,7 @@ func FromString(s string) (Codepoint, error) {
 		s = s[2:]
 		base = 2
 
-	case strings.HasPrefix(s, "X") || strings.HasPrefix(s, "U"):
+	case strings.HasPrefix(s, "X") || strings.HasPrefix(s, "U") || strings.HasPrefix(s, "%"):
 		s = s[1:]
 	case strings.HasPrefix(s, "O"):
 		s = s[1:]