Ensure cmus configuration integrity

Create the 'rc' file if it doesn't exist yet, and exit if the 'autosave'
file does not exist.

Author: PhilipTrauner

cmus_osx/__init__.py

@@ -14,6 +14,7 @@
 from click import echo
 from click import style
 
+from .constants import AUTOSAVE_MISSING
 from .constants import CMUS_OSX_FOLDER_NAME
 from .constants import CONFIG_NAME
 from .constants import COULD_NOT_LOCATED_CMUS_DIRECTORY
@@ -67,6 +68,16 @@ def entrypoint(ctx):
             with open(config_path, "w") as f:
                 f.write(template(ENV_VAR_PREFIX, ENV))
 
+        if not cmus_config.rc_path.is_file():
+            cmus_config.rc_path.touch()
+
+        if not cmus_config.autosave_path.is_file():
+            echo(
+                f"{style('ERROR', fg='red')}: cmus config file missing (launch cmus at least once "
+                "before attempting installation)"
+            )
+            exit(AUTOSAVE_MISSING)
+
         locals_ = locals()
 
         for local in (local for local in locals_ if local != "ctx"):

cmus_osx/constants.py

@@ -34,6 +34,7 @@
 }
 
 COULD_NOT_LOCATED_CMUS_DIRECTORY = 1
+AUTOSAVE_MISSING = 2
 
 ENV_VAR_PREFIX = "CMUS_OSX"
 ENV: Dict[str, Default] = {