Refactor list_journals()

Create three new methods for each journal list format.
- JSON, YAML, STDOUT

jrnl/output.py

@@ -25,32 +25,50 @@ def deprecated_cmd(old_cmd, new_cmd, callback=None, **kwargs):
         callback(**kwargs)
 
 
-def list_journals(configuration, format=None):
+def journal_list_to_json(journal_list):
-    from jrnl import config
-
-    """List the journals specified in the configuration file"""
-    if format == "json":
     import json
 
-        return json.dumps(configuration["journals"])
+    return json.dumps(journal_list)
-    elif format == "yaml":
+
+
+def journal_list_to_yaml(journal_list):
     from io import StringIO
 
     from ruamel.yaml import YAML
 
     output = StringIO()
-        YAML().dump(configuration["journals"], output)
+    YAML().dump(journal_list, output)
     return output.getvalue()
-    else:
+
-        result = f"Journals defined in config ({config.get_config_path()})\n"
+
-        ml = min(max(len(k) for k in configuration["journals"]), 20)
+def journal_list_to_stdout(journal_list):
-        for journal, cfg in configuration["journals"].items():
+    result = f"Journals defined in config ({journal_list['config_path']})\n"
+    ml = min(max(len(k) for k in journal_list["journals"]), 20)
+    for journal, cfg in journal_list["journals"].items():
         result += " * {:{}} -> {}\n".format(
             journal, ml, cfg["journal"] if isinstance(cfg, dict) else cfg
         )
     return result
 
 
+def list_journals(configuration, format=None):
+    from jrnl import config
+
+    """List the journals specified in the configuration file"""
+
+    journal_list = {
+        "config_path": config.get_config_path(),
+        "journals": configuration["journals"],
+    }
+
+    if format == "json":
+        return journal_list_to_json(journal_list)
+    elif format == "yaml":
+        return journal_list_to_yaml(journal_list)
+    else:
+        return journal_list_to_stdout(journal_list)
+
+
 def print_msg(msg: Message, **kwargs) -> Union[None, str]:
     """Helper function to print a single message"""
     kwargs["style"] = msg.style