use same parser to parse cli and gui arguments

[Freed-Wu]

fix #175

❯ time pix2tex -h
usage: pix2tex [-h] [-t TEMPERATURE] [-c CONFIG] [-m CHECKPOINT] [--no-cuda] [--no-resize] [-s] [-f FILE] [-k] [--gui] [--gnome]

options:
  -h, --help            show this help message and exit
  -t TEMPERATURE, --temperature TEMPERATURE
                        Softmax sampling frequency
  -c CONFIG, --config CONFIG
                        path to config file
  -m CHECKPOINT, --checkpoint CHECKPOINT
                        path to weights file
  --no-cuda             Compute on CPU
  --no-resize           Resize the image beforehand
  -s, --show            Show the rendered predicted latex code (cli only)
  -f FILE, --file FILE  Predict LaTeX code from image file instead of clipboard (cli only)
  -k, --katex           Render the latex code in the browser (cli only)
  --gui                 Use GUI (gui only)
  --gnome               Use gnome-screenshot to capture screenshot (gui only)
pix2tex -h  0.03s user 0.01s system 99% cpu 0.041 total

I use same parser to parse cli and gui arguments. Only --gui or --gnome or
the name is pix2tex_gui or latexocr, it will use gui.

name = os.path.split(sys.argv[0])[-1]
if arguments.gui or arguments.gnome or name in ['pix2tex_gui', 'latexocr']:
    from .gui import main
else:
    from .cli import main

And now you can:

❯ python -m pix2tex -h
usage: __main__.py [-h] [-t TEMPERATURE] [-c CONFIG] [-m CHECKPOINT] [--no-cuda] [--no-resize] [-s] [-f FILE] [-k] [--gui] [--gnome]

options:
  -h, --help            show this help message and exit
  -t TEMPERATURE, --temperature TEMPERATURE
                        Softmax sampling frequency
  -c CONFIG, --config CONFIG
                        path to config file
  -m CHECKPOINT, --checkpoint CHECKPOINT
                        path to weights file
  --no-cuda             Compute on CPU
  --no-resize           Resize the image beforehand
  -s, --show            Show the rendered predicted latex code (cli only)
  -f FILE, --file FILE  Predict LaTeX code from image file instead of clipboard (cli only)
  -k, --katex           Render the latex code in the browser (cli only)
  --gui                 Use GUI (gui only)
  --gnome               Use gnome-screenshot to capture screenshot (gui only)

or

❯ pix2tex/__main__.py -h
usage: __main__.py [-h] [-t TEMPERATURE] [-c CONFIG] [-m CHECKPOINT] [--no-cuda] [--no-resize] [-s] [-f FILE] [-k] [--gui] [--gnome]

options:
  -h, --help            show this help message and exit
  -t TEMPERATURE, --temperature TEMPERATURE
                        Softmax sampling frequency
  -c CONFIG, --config CONFIG
                        path to config file
  -m CHECKPOINT, --checkpoint CHECKPOINT
                        path to weights file
  --no-cuda             Compute on CPU
  --no-resize           Resize the image beforehand
  -s, --show            Show the rendered predicted latex code (cli only)
  -f FILE, --file FILE  Predict LaTeX code from image file instead of clipboard (cli only)
  -k, --katex           Render the latex code in the browser (cli only)
  --gui                 Use GUI (gui only)
  --gnome               Use gnome-screenshot to capture screenshot (gui only)