Properly handle GitHub username starting with digit

Author: object-Object

CHANGELOG.md

@@ -1,5 +1,11 @@
 # Changelog
 
+## `2.2.3` - 2025-12-13
+
+### Fixes
+
+- Fixed a crash caused by the use of a GitHub username starting with a digit.
+
 ## `2.2.2` - 2025-10-27
 
 ### Changes

copier.yml

@@ -25,6 +25,12 @@ github_user:
     {%- import "macros/validators.jinja" as validators -%}
     {{- validators.not_empty(github_user) -}}
 
+sanitized_github_user:
+  when: false
+  default: |
+    {%- set v = github_user|lower|replace('-', '_') -%}
+    {{- '_'~v if v[0].isdigit() else v -}}
+
 github_repo:
   type: str
   help: GitHub repository name
@@ -33,7 +39,7 @@ github_repo:
 java_package:
   type: str
   help: Base Java package (eg. net.minecraft, at.petrak.hexcasting)
-  default: "io.github.{{ github_user|lower|replace('-', '_') }}.{{ modid }}"
+  default: "io.github.{{ sanitized_github_user }}.{{ modid }}"
   validator: |
     {%- import "macros/validators.jinja" as validators -%}
     {{- validators.not_empty(java_package) -}}

ctt.toml

@@ -12,3 +12,7 @@ mappings_name = "Mojmap"
 
 [output.".ctt/yarn"]
 mappings_name = "Yarn"
+
+[output.".ctt/leading_number_username"]
+mappings_name = "Mojmap"
+github_user = "1leadingnum"