commit b3af55572e7ae9d4d8689f29208da5cd88b4472d
Author: John Burwell <john@b-wells.us>
Date:   Sun Apr 23 16:22:08 2023 -0500

    initial commit

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..a672fc2
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,164 @@
+messages.db
+config.yaml
+
+# Byte-compiled / optimized / DLL files
+__pycache__/
+*.py[cod]
+*$py.class
+
+# C extensions
+*.so
+
+# Distribution / packaging
+.Python
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+wheels/
+share/python-wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+MANIFEST
+
+# PyInstaller
+#  Usually these files are written by a python script from a template
+#  before PyInstaller builds the exe, so as to inject date/other infos into it.
+*.manifest
+*.spec
+
+# Installer logs
+pip-log.txt
+pip-delete-this-directory.txt
+
+# Unit test / coverage reports
+htmlcov/
+.tox/
+.nox/
+.coverage
+.coverage.*
+.cache
+nosetests.xml
+coverage.xml
+*.cover
+*.py,cover
+.hypothesis/
+.pytest_cache/
+cover/
+
+# Translations
+*.mo
+*.pot
+
+# Django stuff:
+*.log
+local_settings.py
+db.sqlite3
+db.sqlite3-journal
+
+# Flask stuff:
+instance/
+.webassets-cache
+
+# Scrapy stuff:
+.scrapy
+
+# Sphinx documentation
+docs/_build/
+
+# PyBuilder
+.pybuilder/
+target/
+
+# Jupyter Notebook
+.ipynb_checkpoints
+
+# IPython
+profile_default/
+ipython_config.py
+
+# pyenv
+#   For a library or package, you might want to ignore these files since the code is
+#   intended to run in multiple environments; otherwise, check them in:
+# .python-version
+
+# pipenv
+#   According to pypa/pipenv#598, it is recommended to include Pipfile.lock in version control.
+#   However, in case of collaboration, if having platform-specific dependencies or dependencies
+#   having no cross-platform support, pipenv may install dependencies that don't work, or not
+#   install all needed dependencies.
+#Pipfile.lock
+
+# poetry
+#   Similar to Pipfile.lock, it is generally recommended to include poetry.lock in version control.
+#   This is especially recommended for binary packages to ensure reproducibility, and is more
+#   commonly ignored for libraries.
+#   https://python-poetry.org/docs/basic-usage/#commit-your-poetrylock-file-to-version-control
+#poetry.lock
+
+# pdm
+#   Similar to Pipfile.lock, it is generally recommended to include pdm.lock in version control.
+#pdm.lock
+#   pdm stores project-wide configurations in .pdm.toml, but it is recommended to not include it
+#   in version control.
+#   https://pdm.fming.dev/#use-with-ide
+.pdm.toml
+
+# PEP 582; used by e.g. github.com/David-OConnor/pyflow and github.com/pdm-project/pdm
+__pypackages__/
+
+# Celery stuff
+celerybeat-schedule
+celerybeat.pid
+
+# SageMath parsed files
+*.sage.py
+
+# Environments
+.env
+.venv
+env/
+venv/
+ENV/
+env.bak/
+venv.bak/
+
+# Spyder project settings
+.spyderproject
+.spyproject
+
+# Rope project settings
+.ropeproject
+
+# mkdocs documentation
+/site
+
+# mypy
+.mypy_cache/
+.dmypy.json
+dmypy.json
+
+# Pyre type checker
+.pyre/
+
+# pytype static type analyzer
+.pytype/
+
+# Cython debug symbols
+cython_debug/
+
+# PyCharm
+#  JetBrains specific template is maintained in a separate JetBrains.gitignore that can
+#  be found at https://github.com/github/gitignore/blob/main/Global/JetBrains.gitignore
+#  and can be added to the global gitignore or merged into this file.  For a more nuclear
+#  option (not recommended) you can uncomment the following to ignore the entire idea folder.
+#.idea/
+
diff --git a/main.py b/main.py
new file mode 100644
index 0000000..100b55c
--- /dev/null
+++ b/main.py
@@ -0,0 +1,47 @@
+import argparse
+import sys
+
+from rsbbs.bbs import BBS
+
+
+def main():
+
+    # Parse and handle the system invocation arguments
+    sysv_parser = argparse.ArgumentParser(
+        description="A Really Simple BBS.")
+
+    sysv_parser.add_argument('-d', '--debug', 
+                             action='store_true', 
+                             default=None,
+                             dest="debug",
+                             help="Enable debugging output to stdout", 
+                             required=False)
+    
+    sysv_parser.add_argument('-s', '--calling-station', 
+                             action='store', 
+                             default='N0CALL',
+                             dest="calling_station",
+                             help="The callsign of the calling station", 
+                             required=True)
+    
+    sysv_parser.add_argument('-f', '--config-file', 
+                             action='store', 
+                             default='config.yaml',
+                             dest="config_file",
+                             help="specify path to config.yaml file", 
+                             required=False)
+    
+    sysv_parser.add_argument('-v', '--version', 
+                             action='version', 
+                             version=f"{sysv_parser.prog} version zero point aitch point negative purple")
+    
+    sysv_args = sysv_parser.parse_args(sys.argv[1:])
+
+    # Instantiate the BBS object with the supplied (or default) config file
+    bbs = BBS(sysv_args)
+
+    # Start the main BBS loop
+    bbs.main()
+
+if __name__ == "__main__":
+    main()
diff --git a/requirements.txt b/requirements.txt
new file mode 100644
index 0000000..bee6c14
--- /dev/null
+++ b/requirements.txt
@@ -0,0 +1 @@
+PyYAML==6.0
diff --git a/rsbbs/__init__.py b/rsbbs/__init__.py
new file mode 100644
index 0000000..c29fc49
--- /dev/null
+++ b/rsbbs/__init__.py
@@ -0,0 +1 @@
+__all__ = ["bbs", "message", "project_root"]
\ No newline at end of file
diff --git a/rsbbs/bbs.py b/rsbbs/bbs.py
new file mode 100644
index 0000000..bbcd5f2
--- /dev/null
+++ b/rsbbs/bbs.py
@@ -0,0 +1,271 @@
+import logging.config
+import os
+import subprocess
+import sys
+import yaml
+
+from sqlalchemy import create_engine, delete, select
+from sqlalchemy.orm import Session
+from typing import *
+
+from rsbbs.message import Message, Base
+from rsbbs.parser import Parser
+
+
+# Main BBS class
+
+class BBS():
+
+    def __init__(self, sysv_args):
+
+        self.config = self.load_config(sysv_args.config_file)
+        self.sysv_args = sysv_args
+        self.calling_station = sysv_args.calling_station
+
+        logging.config.dictConfig(self.config['logging'])
+
+    @property
+    def config(self):
+        return self._config
+
+    @config.setter
+    def config(self, value):
+        self._config = value
+
+    # Load the config file
+    def load_config(self, config_file):
+
+        try:
+            with open(config_file, 'r') as stream:
+                config = yaml.safe_load(stream)
+        except yaml.YAMLError as e:
+            print("Could not load configuration file. Error: {}".format(e))
+            exit(1)
+        except FileNotFoundError as e:
+            print('Configuration file full path: {}'.format(os.path.abspath(config_file)))
+            print("Configuration file {} could not be found. Error: {}".format(config_file, e))
+            exit(1)
+        except Exception as msg:
+            print("Error while loading configuration file {}. Error: {}".format(config_file))
+            exit(1)
+
+        logging.info("Configuration file was successfully loaded. File name: {}".format(config_file))
+
+        return config
+    
+
+    # Set up the BBS command parser
+
+    @property
+    def parser(self):
+        commands = [
+            # (name, aliases, helpmsg, function, {arg: {arg attributes}, ...})
+            ('bye', ['b', 'q'], 'Sign off and disconnect', self.bye, {}),
+            ('delete', ['k', 'd'], 'Delete a message', self.delete,
+                {'number': {'help': 'The numeric index of the message to delete'}},
+            ),
+            ('deletem', ['dm', 'km'], 'Delete all your messages', self.delete_mine, {}),
+            ('help', ['h', '?'], 'Show help', self.help, {}),
+            ('heard', ['j'], 'Show heard stations log', self.heard, {}),
+            ('list', ['l'], 'List all messages', self.list, {}),
+            ('listm', ['lm'], 'List only messages addressed to you', self.list_mine, {}),
+            ('read', ['r'], 'Read messages', self.read, 
+                {'number': {'help': 'Message number to read'}}
+            ),
+            ('readm', ['rm'], 'Read only messages addressed to you', self.read_mine, {}),
+            ('send', ['s'], 'Send a new message to a user', self.send,
+                {
+                    'callsign': {'help': 'Message recipient callsign'},
+                    '--subject': {'help': 'Message subject'},
+                    '--message': {'help': 'Message'},
+                },
+            ),
+            ('sendp', ['sp'], 'Send a private message to a user', self.send_private,
+                {
+                    'callsign': {'help': 'Message recipient callsign'},
+                    '--subject': {'help': 'Message subject'},
+                    '--message': {'help': 'Message'},
+                },
+            ),
+        ]
+        return Parser(commands).parser
+
+
+    # Database
+
+    @property
+    def engine(self):
+        engine = create_engine('sqlite:///messages.db', echo=self.sysv_args.debug)
+        Base.metadata.create_all(engine)
+        return engine
+    
+
+    # Input and output
+
+    @property
+    def input_stream(self):
+        return sys.stdin
+    
+    def read_line(self, prompt):
+        output = None
+        while output == None:
+            if prompt:
+                self.write_output(prompt)
+            input = sys.stdin.readline().strip()
+            if input != "":
+                output = input
+        return output
+
+    def read_multiline(self, prompt):
+        output = ""
+        if prompt:
+            self.write_output(prompt)
+        while True:
+            line = sys.stdin.readline()
+            if line.lower().strip() == "/ex":
+                break
+            else:
+                output += line
+        return output
+
+    def write_output(self, output):
+        sys.stdout.write(output + '\r\n')
+
+    def print_message_list(self, results):
+        self.write_output(f"{'MSG#': <{5}} {'TO': <{9}} {'FROM': <{9}} {'DATE': <{10}}  SUBJECT")
+        for result in results:
+            self.write_output(f"{result.Message.id: <{5}} {result.Message.recipient: <{9}} {result.Message.sender: <{9}} {result.Message.datetime.strftime('%Y-%m-%d')}  {result.Message.subject}")
+
+    def print_message(self, message):
+        self.write_output(f"")
+        self.write_output(f"Message: {message.Message.id}")
+        self.write_output(f"Date:    {message.Message.datetime.strftime('%A, %B %-d, %Y at %-H:%M %p UTC')}")
+        # self.write_output(f"Date:    {message.Message.datetime.strftime('%Y-%m-%dT%H:%M:%S+0000')}")
+        self.write_output(f"From:    {message.Message.sender}")
+        self.write_output(f"To:      {message.Message.recipient}")
+        self.write_output(f"Subject: {message.Message.subject}")
+        self.write_output(f"\r\n{message.Message.message}")
+
+
+    # BBS command functions
+
+    def bye(self, args):
+        '''Disconnect and exit'''
+        self.write_output("Bye!")
+        exit(0)
+
+    def delete(self, args):
+        '''Delete message specified by numeric index'''
+        with Session(self.engine) as session:
+            try:
+                message = session.get(Message, args.number)
+                session.delete(message)
+                session.commit()
+                self.write_output(f"Deleted message #{args.number}")
+            except Exception as e:
+                self.write_output(f"Unable to delete message #{args.number}")
+
+    def delete_mine(self, args):
+        '''Delete all messages addressed to user'''
+        with Session(self.engine) as session:
+            try:
+                statement = delete(Message).where(Message.recipient == self.calling_station).returning(Message)
+                results = session.execute(statement)
+                count = len(results.all())
+                if count > 0:
+                    self.write_output(f"Deleted {count} messages")
+                    session.commit()
+                else:
+                    self.write_output(f"No messages to delete.")
+            except Exception as e:
+                self.write_output(f"Unable to delete messages: {e}")
+
+    def heard(self, args):
+        '''Show heard stations log'''
+        self.write_output(f"Heard stations:")
+        result = subprocess.run(['mheard'], capture_output=True, text=True)
+        self.write_output(result.stdout)
+
+    def help(self, args):
+        '''Print help'''
+        self.parser.print_help()
+
+    def list(self, args):
+        '''List all messages'''
+        with Session(self.engine) as session:
+            statement = select(Message).where((Message.is_private == False) | (Message.recipient == self.calling_station))
+            results = session.execute(statement)
+            self.print_message_list(results)
+
+    def list_mine(self, args):
+        '''List only messages addressed to user'''
+        with Session(self.engine) as session:
+            statement = select(Message).where(Message.recipient == self.calling_station)
+            results = session.execute(statement)
+            self.print_message_list(results)
+
+    def read(self, args):
+        '''Read messages'''
+        with Session(self.engine) as session:
+            statement = select(Message).where(Message.id == args.number)
+            result = session.execute(statement).one()
+            self.print_message(result)
+
+    def read_mine(self, args):
+        '''Read only messages addressed to user'''
+        with Session(self.engine) as session:
+            statement = select(Message).where(Message.recipient == self.calling_station)
+            result = session.execute(statement)
+            for message in result.all():
+                self.print_message(message)
+                self.write_output("Enter to continue")
+                sys.stdin.readline()
+
+    def send(self, args, is_private=False):
+        '''Create a message addressed to another user'''
+        if not args.callsign:
+            args.callsign = self.read_line("Callsign:")
+        if not args.subject:
+            args.subject = self.read_line("Subject:")
+        if not args.message:
+            args.message = self.read_multiline("Message - end with /ex on a single line:")
+        with Session(self.engine) as session:
+            session.add(Message(
+                sender=self.calling_station.upper(),
+                recipient=args.callsign.upper(),
+                subject=args.subject,
+                message=args.message,
+                is_private=is_private
+            ))
+            try:
+                session.commit()
+                self.write_output("Message saved!")
+            except Exception as e:
+                session.rollback()
+                self.write_output("Error saving message. Contact the sysop for assistance.")
+
+    def send_private(self, args):
+        self.send(args, is_private=True)
+
+    # Main loop
+
+    def main(self):
+        # Show greeting
+        self.write_output(f"[RSBBS-1.0.0] listening on {self.config['callsign']} ")
+        self.write_output(f"Welcome to {self.config['bbs_name']}, {self.calling_station}")
+        self.write_output(self.config['banner_message'])
+        self.write_output("For help, enter 'h'")
+
+        # Show initial prompt to the calling user
+        self.write_output(self.config['command_prompt'])
+
+        # Parse the BBS interactive commands for the rest of time
+        for line in self.input_stream:
+            try:
+                args = self.parser.parse_args(line.split())
+                args.func(args)
+            except Exception as msg:
+                pass
+
+            # Show our prompt to the calling user again
+            self.write_output(self.config['command_prompt'])
diff --git a/rsbbs/config.yaml.sample b/rsbbs/config.yaml.sample
new file mode 100644
index 0000000..8403556
--- /dev/null
+++ b/rsbbs/config.yaml.sample
@@ -0,0 +1,44 @@
+---
+# Really Simple BBS Config File
+
+
+# Basic BBS info
+
+bbs_name: Really Simple BBS
+callsign: KI5QKX-10
+banner_message: KI5QKX-10 welcomes you
+command_prompt: "ENTER COMMAND >"
+
+
+# Logging
+
+logging:
+
+    version: 1
+    disable_existing_loggers: true
+
+    formatters:
+        briefFormatter:
+            format: '%(levelname)s: %(message)s'
+        preciseFormatter:
+            format: '%(asctime)s - %(module)s - %(levelname)s: %(message)s'
+            datefmt: '%Y/%m/%d %H:%M:%S'
+
+    handlers:
+        console:
+            class: logging.StreamHandler
+            formatter: briefFormatter
+            level: ERROR
+            stream: ext://sys.stdout
+        file:
+            class : logging.FileHandler
+            formatter: preciseFormatter
+            level: DEBUG
+            ## Note that file does not have to exist, but the directories (in case of full path name) should
+            filename: reference_data_manager.log
+
+    root:
+        level: DEBUG
+        handlers: [console, file]
+
+...
diff --git a/rsbbs/message.py b/rsbbs/message.py
new file mode 100644
index 0000000..41ce3ae
--- /dev/null
+++ b/rsbbs/message.py
@@ -0,0 +1,21 @@
+from datetime import datetime, timezone
+
+from sqlalchemy import *
+from sqlalchemy.orm import *
+from typing import *
+
+# engine = create_engine('sqlite:///messages.db', echo=True)
+
+class Base(DeclarativeBase):
+    pass
+
+class Message(Base):
+    __tablename__ = 'message'
+    id: Mapped[int] = mapped_column(primary_key=True)
+    sender: Mapped[str] = mapped_column(String)
+    recipient: Mapped[str] = mapped_column(String)
+    subject: Mapped[str] = mapped_column(String)
+    message: Mapped[str] = mapped_column(String)
+    datetime: Mapped[DateTime] = mapped_column(DateTime, default=datetime.now(timezone.utc))
+    is_private: Mapped[bool] = mapped_column(Boolean)
+
diff --git a/rsbbs/parser.py b/rsbbs/parser.py
new file mode 100644
index 0000000..01ebf90
--- /dev/null
+++ b/rsbbs/parser.py
@@ -0,0 +1,44 @@
+import argparse
+
+# We want to override the error and exit methods of ArgumentParser
+# to prevent it exiting unexpectedly or spewing error data over the air
+
+class BBSArgumentParser(argparse.ArgumentParser):
+    # Override the error handler to prevent exiting on error
+    def error(self, message):
+        print(message)
+        raise Exception(message)
+
+    def exit(self):
+        pass
+
+
+class Parser(BBSArgumentParser):
+
+    def __init__(self, commands):
+        self.parser = self.init_parser(commands)
+
+    def init_parser(self, commands):
+        # Root parser for BBS commands
+        parser = BBSArgumentParser(
+            description='BBS Main Menu',
+            prog='',
+            add_help=False,
+            usage=argparse.SUPPRESS,
+        )
+
+        # We will create a subparser for each individual command
+        subparsers = parser.add_subparsers(title='Commands', dest='command')
+
+        # Loop through the commands and add each as a subparser
+        for name, aliases, help_msg, func, arguments in commands:
+            subparser = subparsers.add_parser(
+                name,
+                aliases=aliases,
+                help=help_msg,
+            )
+            for arg_name, options in arguments.items():
+                subparser.add_argument(arg_name, **options)
+            subparser.set_defaults(func=func)
+
+        return parser    
diff --git a/rsbbs/project_root.py b/rsbbs/project_root.py
new file mode 100644
index 0000000..06cf9f1
--- /dev/null
+++ b/rsbbs/project_root.py
@@ -0,0 +1,9 @@
+'''
+This is a placeholder to be able to access the location of project root directory.
+This is needed to be able to read config.yaml from this package, when it is distributed with setuptools and installed.
+'''
+
+import os
+
+def path():
+    return os.path.dirname(__file__)
diff --git a/setup.py b/setup.py
new file mode 100644
index 0000000..4c5df0f
--- /dev/null
+++ b/setup.py
@@ -0,0 +1,43 @@
+from setuptools import setup, find_packages
+
+# https://www.digitalocean.com/community/tutorials/how-to-package-and-distribute-python-applications
+
+setup(
+    name="really-simple-bbs",
+    version="0.1",
+
+    description='''A really simple BBS developed particularly with ax.25 and amateur radio in mind.''',
+
+    author='John Burwell',
+    author_email='john@atatdotdot.com',
+
+    url='https://github.com/jmbwell/really-simple-bbs',
+
+    classifiers=[
+        "Programming Language :: Python :: 3",
+        "License :: OSI Approved :: MIT License",
+    ],
+
+
+    packages=find_packages(exclude=['test*', 'Test*']),
+
+    package_data={
+        '': ['README.md', 'LICENSE'],
+        'really-simple-bbs': ['config.yaml.sample']
+      },
+
+
+    scripts=['main.py'],
+
+    entry_points={
+          'console_scripts': [
+              'really-simple-bbs = main:main',
+          ],
+      },
+
+    install_requires=[
+        'PyYAML==4.2b1',
+      ],
+
+
+)
\ No newline at end of file