pyenv-virtualenvs.py

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##
#  @package pyenv-virtualenvs
#  @file pyenv-virtualenvs.py
#  @author Michael Paul Korthals
#  @date 2025-07-10
#  @version 1.0.0
#  @copyright © 2025 Michael Paul Korthals. All rights reserved.
#  See License details in the documentation.
#
#  Utility application to list the installed Python versions and
#  virtual environments. In addition the Project properties will
#  be listed and its locations will be displayed in a folder tree.
#
 
# --- IMPORTS ----------------------------------------------------------
 
# Python
import argparse
import os
import sys
 
# Avoid colored output problems
os.system('')
 
# Community
try:
    import virtualenv
except ImportError():
    print(
        '\x1b[101mCRITICAL %s\x1b[0m'
        %
        'Cannot find package "%s".'
        %
        'virtualenv'
    )
    print(
        '\x1b[37mINFO     %s\x1b[0m'
         %
        'Install it using "pip". Then try again.')
    import virtualenv
 
# My
import lib.hlp as hlp
import lib.log as log
import lib.tbl as tbl
 
 
# --- RUN ---------------------------------------------------------------
 
## Sub routine to run the application.
#
#  @return RC = 0 or other values in case of error.
def run() -> int:
    rc: int = 0
    cwd = os.getcwd()
    # noinspection PyBroadException
    try:
        while True:
            log.verbose(
                'Listing Python virtual environments in "pyenv".'
            )
            log.verbose('Determining Python versions ...')
            # Determine Python version, which is capable
            # to install Python virtual environment.
            versions_dir = os.path.join(
                os.environ['PYENV_ROOT'],
                'versions'
            )
            if not os.path.isdir(versions_dir):
                log.error('Cannot find any Python version in "pyenv".')
                log.info('Install a Python version 3.3+ into "pyenv".')
                rc = 1
                break
            vers = hlp.getPythonVersions(
                '*',
                venv_capable=False,
                as_paths=True
            )
            if len(vers) == 0:
                log.error('Cannot find a Python version in "pyenv".')
                log.info('Install a Python version 3.3+ into "pyenv".')
                rc = 1
                break
            per = os.environ['PYENV_ROOT']
            # Pass 1: Collect the Python versions.
            pyts = [
                [tbl.HEADER, 'G', 'Venv-Capable', 'Version', '"pyenv" Location'],
                [tbl.SEPARATOR]
            ]
            for ver in vers:
                pyts_item = [
                    tbl.DATA,
                    hlp.getGlobalStar(ver),
                    hlp.getColoredVenvCapability(ver),
                    os.path.basename(ver),
                    '%PYENV_ROOT%' + os.sep + ver[len(per):]
                ]
                pyts.append(pyts_item)
            # End for
            pyts.append([tbl.SEPARATOR])
            # Pass 2: Collect the virtual environments.
            pves = [
                [tbl.HEADER, 'A', 'Version', 'Name', '"pyenv" Location'],
                [tbl.SEPARATOR]
            ]
            for ver in vers:
                venvs = hlp.getEnvs(ver,'*', as_paths=True)
                for venv in venvs:
                    act = ' '
                    if (
                        ('PROMPT' in os.environ)
                        and
                        (f'({os.path.basename(venv)})' in os.environ['PROMPT'])
                    ):
                        act = '*'
                    pves.append([
                        tbl.DATA,
                        act,
                        os.path.basename(ver),
                        os.path.basename(venv),
                        '%PYENV_ROOT%' + os.sep + venv[len(per):]
                    ])
            # End for
            pves.append([tbl.SEPARATOR])
            # Pass 3: Output list of Python versions.
            table_pyts = tbl.SimpleTable(
                pyts,
                headline='INSTALLED PYTHON VERSIONS (G = global):'
            )
            table_pyts.run()
            # Pass 4: Output list of virtual environments.
            table_pves = tbl.SimpleTable(
                pves,
                headline='AVAILABLE PYTHON VIRTUAL ENVIRONMENTS (A = active):'
            )
            table_pves.run()
            # Output list of project properties (if exists)
            hlp.listProjectProperties()
            log.verbose(f'Done (RC = {rc}).')
            # Go on
            break
        # End while
    except:
        log.error(sys.exc_info())
        rc = 1
    finally:
        os.chdir(cwd)
    return rc
 
 
# --- MAIN --------------------------------------------------------------
 
## Parse CLI arguments for this application.<br>
#  <br>
#  Implement this as required, but don't touch the interface definition
#  for input and output.
#
#  @return A tuple of:
#    * Namespace to read arguments in "dot" notation or None
#    in case of help or error.
#    * RC = 0 or another value in case of error.
def parseCliArguments() -> tuple[(argparse.Namespace, None), int]:
    rc: int = 0
    # noinspection PyBroadException
    try:
        parser = argparse.ArgumentParser(
# --- BEGIN CHANGE -----------------------------------------------------
            prog='pyenv virtualenvs',
            description='Output lists of Python versions, virtual environments and related project properties.'
        )
# --- END CHANGE -------------------------------------------------------
        return parser.parse_args(), rc
    except SystemExit:
        return None, 0  # -h, --help
    except:
        log.error(sys.exc_info())
        return None, 1
 
## Main routine of the application.
#
#  @return RC = 0 or other values in case of error.
def main() -> int:
    # noinspection PyBroadException
    try:
        while True:
            # Audit the operating system platform
            rc = hlp.auditPlatform('Windows')
            if rc != 0:
                # Deviation: Reject unsupported platform
                break
            # Audit the global Python version number
            rc = hlp.auditGlobalPythonVersion('3.6')
            if rc != 0:
                # Deviation: Reject unsupported Python version
                break
            # Initialize the colored logging to console
            log.initLogging()
            # Audit the "pyenv" version number
            rc = hlp.auditPyEnv('3')
            if rc != 0:
                # Deviation: Reject unsupported "pyenv" version
                break
            # Parse arguments
            log.verbose('Parsing arguments ...')
            args, rc = parseCliArguments()
            if rc != 0:
                break
            if args is None:  # -h, --help
                break
            # Run this application
            log.verbose('Running application ...')
            rc = run()
            if rc != 0:
                break
            # Go on
            break
        # End while
    except Exception as exc:
        if log.isInitialized():
            log.error(sys.exc_info())
        else:
            print(
                '\x1b[91mERROR: Unexpected error "%s".\x1b[0m'
                %
                str(exc)
            )
        rc = 1
    return rc
 
 
if __name__ == "__main__":
    sys.exit(main())
 
# --- END OF CODE ------------------------------------------------------