added custom functionality and working with new toml as well, and update cli functions

packages/foreignthon/pyproject.toml

@@ -56,3 +56,6 @@ ignore = ["E501"]
 
 [tool.ruff.lint.per-file-ignores]
 "pack.py" = ["E501"]
+
+[tool.hatch.build.targets.wheel.force-include]
+"src/foreignthon/template.json" = "foreignthon/template.json"

packages/foreignthon/src/foreignthon/cli.py

@@ -12,18 +12,16 @@ from .transpiler import run_transpiled, transpile_file
 
 CONTEXT_SETTINGS = dict(help_option_names=["-h", "--help"])
 
-
 def _load_effective_pack(project: Path, lang: str) -> dict:
     """
-    Load installed pack then merge local custom.json on top if configured.
+    Load pack for a file. Priority:
-    Walks up from project to find .foreignthon.toml.
+    1. custom_pack in .foreignthon.toml — no installed pack needed
+    2. installed pack via entry points
     """
     import json
     from .pack import load_pack
 
-    pack = load_pack(lang)
+    # Walk up to find .foreignthon.toml
-
-    # Walk up directories to find .foreignthon.toml
     search = project if project.is_dir() else project.parent
     toml_path = None
     for parent in [search, *search.parents]:
@@ -32,20 +30,29 @@ def _load_effective_pack(project: Path, lang: str) -> dict:
             toml_path = candidate
             break
 
+    # Check for custom_pack first — if found, load it directly
+    # and merge on top of template (no installed pack required)
     if toml_path:
         for line in toml_path.read_text(encoding="utf-8").splitlines():
-            if line.strip().startswith("custom_pack"):
+            if line.strip().startswith("custom_pack") and not line.strip().startswith("#"):
                 custom_path = toml_path.parent / line.split("=", 1)[1].strip().strip('"').strip("'")
                 if custom_path.exists():
                     custom = json.loads(custom_path.read_text(encoding="utf-8"))
+                    # If custom pack has meta with a code, it's a standalone pack
+                    if custom.get("meta", {}).get("code"):
+                        return custom
+                    # Otherwise it's an override — merge on top of installed pack
+                    pack = load_pack(lang)
                     for section in ("keywords", "builtins", "exceptions", "stdlib", "error_messages"):
                         if section in custom:
                             pack[section] = {**pack.get(section, {}), **custom[section]}
                     if "postfix_keywords" in custom:
                         pack["postfix_keywords"] = custom["postfix_keywords"]
+                    return pack
                 break
 
-    return pack
+    # Fall back to installed pack
+    return load_pack(lang)
 
 
 def _pick(mapping: dict, english: str, fallback: str) -> str:
@@ -104,6 +111,15 @@ def new(name: str, lang: str, no_git: bool):
             click.echo("✗ Current directory is not empty.", err=True)
             raise SystemExit(1)
 
+    is_custom = lang == "custom"
+
+    if is_custom:
+        lang_code = click.prompt("Language code (e.g. ru, fr, de)")
+        lang_name_en = click.prompt("Language name in English (e.g. Russian)")
+        lang_name_native = click.prompt("Language name in its own script (e.g. Русский)")
+        pack = _make_scaffold_pack(lang_code, lang_name_en, lang_name_native)
+        lang = lang_code
+    else:
         try:
             pack = _load_effective_pack(project, lang)
         except PackNotFoundError:
@@ -113,12 +129,23 @@ def new(name: str, lang: str, no_git: bool):
 
     lang_name = pack["meta"]["native_name"]
 
+    if is_custom:
+        import json
+        (project / "custom.json").write_text(
+            json.dumps(pack, ensure_ascii=False, indent=2),
+            encoding="utf-8",
+        )
+        toml_custom_line = 'custom_pack = "custom.json"'
+        click.echo("  Created custom.json — fill in your translations!")
+    else:
+        toml_custom_line = '# custom_pack = "custom.json"'
+
     (project / ".foreignthon.toml").write_text(
         f'[foreignthon]\n'
         f'lang = "{lang}"\n'
         f'\n'
         f'# Optional: path to a local JSON that overrides pack keywords\n'
-        f'# custom_pack = "custom.json"\n',
+        f'{toml_custom_line}\n',
         encoding="utf-8",
     )
 
@@ -301,3 +328,19 @@ def decompile(file: Path, lang: str, postfix: bool, output: str | None):
     out_path.parent.mkdir(parents=True, exist_ok=True)
     out_path.write_text(result, encoding="utf-8")
     click.echo(f"Decompiled: {out_path}")
+
+
+def _make_scaffold_pack(lang_code: str, lang_name: str, native_name: str) -> dict:
+    """
+    Load template.json — single source of truth for all pack keys.
+    To add new keywords/builtins, edit template.json only.
+    """
+    import json
+    from importlib.resources import files
+
+    template_path = files("foreignthon") / "template.json"
+    pack = json.loads(template_path.read_text(encoding="utf-8"))
+    pack["meta"]["name"] = lang_name
+    pack["meta"]["native_name"] = native_name
+    pack["meta"]["code"] = lang_code
+    return pack