[WIP] Add config file and scripts to set configs from CLI

WIP: while the config file can be generated and updated, the scripts do
not access values from it, yet.

Credits to @jung-benjamin for coming up with the idea of a config file,
thanks!

.gitignore

@@ -4,3 +4,5 @@ eggs/
 .eggs/
 *.egg-info/
 *.egg
+
+config.ini

scripts/__init__.py

@@ -8,6 +8,7 @@
 
 from .init_python import init_python
 from .init_latex import init_latex
+from .config import cmdline_config
 
 __author__ = "Max Schalz"
 __copyright__ = "Copyright 2021, Max Schalz"

scripts/config.py

@@ -0,0 +1,71 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+
+import argparse
+import configparser
+import os
+
+CONFIG_FNAME = "config.ini"
+CONFIG_PATH = os.path.join(os.path.dirname(os.path.abspath(__file__)),
+                           "..")
+
+def argparser():
+    """Argument parser to obtain config updates from the commandline."""
+    default_config = generate_default_config()
+
+    description = "Update the default values in the configuration file."
+    description += " Allowed sections and options are:\n"
+    for section in default_config.sections():
+        description += f"  {section}\n"
+        for option in default_config.options(section):
+            description += f"    {option}\n"
+    parser = argparse.ArgumentParser(
+        description=description,
+        formatter_class=argparse.RawTextHelpFormatter)
+
+    section = "Config section, e.g., 'global'"
+    parser.add_argument("section", metavar="section", type=str,
+                        help=section)
+    option = "Config option, e.g., 'author'"
+    parser.add_argument("option", metavar="option", type=str,
+                        help=option) 
+    value = "Config value, e.g., 'Jane Doe'"
+    parser.add_argument("value", metavar="value", type=str, help=value)         
+
+    return parser.parse_args()
+
+def cmdline_config():
+    args = argparser()
+    update_config(args.section, args.option, args.value)
+
+def generate_default_config():
+    """Generate a default config parser."""
+    config = configparser.ConfigParser()
+
+    config["global"] = {"author": "Jane Doe"}
+    config["python"] = {"license": "BSD-3-Clause"}
+    config["latex"] = {"title": "Document"}
+
+    return config 
+
+def update_config(section, option, value):
+    """Update an already existing config file."""
+    if not os.path.isfile(os.path.join(CONFIG_PATH, CONFIG_FNAME)):
+        generate_default_config()
+
+    config = configparser.ConfigParser()
+    if os.path.isfile(os.path.join(CONFIG_PATH, CONFIG_FNAME)):
+        with open(os.path.join(CONFIG_PATH, CONFIG_FNAME), "r") as f:
+            config.read_file(f)
+    else:
+        config = generate_default_config()
+
+    if not config.has_section(section):
+        raise TypeError(f"Invalid section: {section}")
+    if not config.has_option(section, option):
+        raise TypeError(f"Invalid option: {option}")
+    config.set(section, option, value)
+
+    with open(os.path.join(CONFIG_PATH, CONFIG_FNAME), "w") as f:
+        config.write(f)
+

setup.py

@@ -18,7 +18,8 @@ def main():
                      "Programming Language :: Python :: 3"],
         install_requires=None,
         entry_points={"console_scripts": ["initpython = scripts:init_python",
-                                          "initlatex = scripts:init_latex"]},
+                                          "initlatex = scripts:init_latex",
+                                          "initconfig = scripts:cmdline_config"]},
     )
 
 if __name__=="__main__":