From 88ce1638164b828317892ddd1ebec4540d046788 Mon Sep 17 00:00:00 2001
From: TimoEg <TimoEge@online.de>
Date: Thu, 10 Oct 2024 17:59:03 +0200
Subject: [PATCH] fixed default __os__

---
 README.md                            |  3 ---
 installation_instruction/__main__.py | 31 ++++++++++++++++++++++++++++
 2 files changed, 31 insertions(+), 3 deletions(-)

diff --git a/README.md b/README.md
index 3a8ac59..e588ed2 100644
--- a/README.md
+++ b/README.md
@@ -114,9 +114,6 @@ description:
   pip: Standard python package manager.
 ```
 
-> [!CAUTION]
-> Currently `__os__` automatic detection not working.
-
 * For the package to set the default os to the running system, name the property `__os__`.
 
 ```yaml
diff --git a/installation_instruction/__main__.py b/installation_instruction/__main__.py
index c9df53a..6c6f509 100644
--- a/installation_instruction/__main__.py
+++ b/installation_instruction/__main__.py
@@ -27,6 +27,7 @@
 import click
 import json
 import platformdirs
+import platform
 
 from .__init__ import __version__, __description__, __repository__, __author__, __author_email__, __license__
 from .get_flags_and_options_from_schema import _get_flags_and_options
@@ -39,6 +40,29 @@
 License: {__license__}
 Repository: {__repository__}"""
 
+def _get_system(option_types):
+    """
+    Returns the os from the list of possible os systems defined in the schema.
+
+    :param option_types: list of system from the schema.
+    :type option_types: list
+    :return: os system from input list or None.
+    :rtype: string or None
+    """    
+    
+    system = platform.system()
+    system_names = {
+        'Linux': 'linux',
+        'Darwin': 'mac',
+        'Windows': 'win',
+    }
+    
+    new_default = system_names.get(system,None)
+    for type in option_types:
+        if new_default in type.lower(): 
+            return type
+
+    return None
 
 class ConfigReadCommand(click.MultiCommand):
     """
@@ -65,6 +89,13 @@ def get_command(self, ctx, config_file: str) -> click.Command|None:
             _red_echo("Error (parsing options from schema): " + str(e))
             exit(1)
 
+        #set new default value for __os__ Option
+        for option in options:
+            if '__os__' in option.name:
+                system_default = _get_system(option.type.choices)
+                if system_default:
+                    option.default = system_default
+
         def callback(**kwargs):
             inst = instruction.validate_and_render(kwargs)
             if inst[1]: