libjam 0.1.8

A library jam for Python.

libjam

A library jam for Python.

Installing

libjam is available on PyPI, and can be installed using pip.

pip install libjam

To install the latest bleeding edge:

pip install git+https://github.com/philippkosarev/libjam.git

Modules

Captain

Makes creating command line interfaces easy.

Example CLI project:

example.py:

from libjam import Captain

class CLI:
  'An example CLI for the libjam library'
  def shout(self, *text):
    'Shouts the given text back'
    text = ' '.join(text)
    if options.get('world'):
      text += ' world'
    print(text + '!')

cli = CLI()
captain = Captain(cli)
captain.add_option(
  'world', ['world', 'w'],
  "Adds ' world' before the exclamation mark",
)
global options
function, args, options = captain.parse()
function(*args)

Usage:

$ ./example.py
example.py: No command specified.
Try 'example.py --help' for more information.

$ ./example.py shout Hello
Hello!

$ ./example.py shout Hello --world
Hello world!

$ ./example.py --help
Usage:
  example.py shout [TEXT]...
Synopsis:
  example.py [OPTION]... COMMAND [ARGS]...
Description:
  An example CLI for the libjam library.
Commands:
  shout - Shouts the given text back.
Options:
  -w, --world - Adds ' world' before the exclamation mark.
  -h, --help  - Prints this page.

Drawer

Responsible for file operations. Accepts the '/' as the file separator regardless the operating system.

Example CLI for calculating filesizes

mass.py:

#! /usr/bin/env python3

from libjam import Captain, drawer, typewriter
import sys

def print_progress(todo, done):
  typewriter.print_progress('Calculating file size', todo, done)

def mass(*paths):
  'Prints human-readable size of files'
  if len(paths) == 0:
    paths = ['./']
  n_paths = len(paths)
  results = {}
  for i, path in enumerate(paths):
    if n_paths > 1:
      print_progress(i+1, n_paths)
    if not drawer.exists(path):
      typewriter.clear_lines(0)
      print(f'{path}: No such file or directory.', file=sys.stderr)
      continue
    size = drawer.get_filesize(path)
    results[path] = size
  results = dict(sorted(results.items(), key=lambda item: item[1], reverse=True))
  typewriter.clear_lines(0)
  for file in results:
    size = results.get(file)
    size, units, _ = drawer.get_readable_filesize(size)
    size = round(size, 1)
    print(f'{file}: {size} {units.upper()}')

captain = Captain(mass)

def main():
  args = captain.parse()
  try:
    return mass(*args)
  except KeyboardInterrupt:
    print()
    sys.exit(1)

if __name__ == '__main__':
  sys.exit(main())

Usage:

$ ./mass.py
./: 100.9 MB

$ ./mass.py downloads pictures videos
videos: 34.7 GB
downloads: 12.6 GB
pictures: 2.2 GB

$ ./mass.py -h
Synopsis:
  mass.py [OPTION]... [PATHS]...
Description:
  Prints human-readable size of files.
Options:
  -h, --help - Prints this page.

Typewriter

Transforms text and prints to the terminal.

Notebook

Allows reading and writing .toml, .ini and .json files and provides an application configuration management system with the Notebook.Ledger class.

Example of an app configured through Notebook.Ledger:

# Imports
from libjam import notebook, drawer

# Defining default values
default_downloads_dir = drawer.absolute_path('~/Downloads')
if not drawer.is_folder(default_downloads_dir):
  default_downloads_dir = None
default_values = {
  'downloads-directory': default_downloads_dir,
}
# Config template
template = '''\
# An override for the default downloads directory
# downloads-directory = ''
'''

# Initialising config
ledger = notebook.Ledger('download-manager')
config_obj = ledger.init_config('config', default_values, template)
config_dict = config_obj.read()

# Checking values
downloads_dir = config_dict.get('downloads-directory')
if downloads_dir is None:
    config_obj.on_error(
      "Could not automatically find an existing Downloads directory. "
      "Please specify 'downloads-directory' in the configuration manually."
  )
if not drawer.exists(downloads_dir):
  config_obj.on_error("The specified 'downloads-directory' does not exist")

download_manager.py:

#! /usr/bin/env python3

# Imports
import requests

# Getting downloads_dir from config
from config import downloads_dir

# The rest of the program...

Example output:

$ ./download_manager.py
Configuration error(s):
/home/philipp/.config/download-manager/config.toml:
  - Could not automatically find an existing Downloads directory. Please specify 'downloads-directory' in the configuration manually.

Clipboard

Provides a few list operations such as deduplicate.

Flashcard

Provides the prompt_yn function.

Cloud

Provides the download function.