Incorrect search directory docstring of qta.load_font() with directory=None

[kumattau]

https://qtawesomedocs.readthedocs.io/en/latest/_generate/qtawesome.load_font.html says,

qtawesome.load_font(prefix, ttf_filename, charmap_filename, directory=None)
Loads a font file and the associated charmap.

If directory is None, the files will be looked for in ./fonts/.

but qta.load_icon() with directory=None searches a font in "qtawesome/fonts", not current "./fonts/".
To avoid the problem and search a font in "./fonts/", users must set directory to "./fonts/" explicitly.

# -*- coding: utf-8 -*-
import sys
from qtpy import QtWidgets, QtCore
import qtawesome as qta

class AwesomeExample(QtWidgets.QDialog):

    def __init__(self):
        super().__init__()
        # Failed if directory=None
        qta.load_font("myicons", "myicons.ttf", "myicons-charmap.json")

        # Succeeds if directory is explicitly set to "./fonts/"
        # qta.load_font("myicons", "myicons.ttf", "myicons-charmap.json", directory="./fonts/")

        icon = qta.icon("myicons.verified-filled")
        button = QtWidgets.QPushButton(icon, "myicons")

        grid = QtWidgets.QGridLayout()
        grid.addWidget(button, 0, 0)
        self.setLayout(grid)
        self.setWindowTitle('Awesome')
        self.show()


def main():
    app = QtWidgets.QApplication(sys.argv)
    QtCore.QTimer.singleShot(10000, app.exit)
    _ = AwesomeExample()
    sys.exit(app.exec_())


if __name__ == '__main__':
    main()

$ python test.py
Traceback (most recent call last):
  File "test.py", line 33, in <module>
    main()
  File "test.py", line 28, in main
    _ = AwesomeExample()
  File "test.py", line 10, in __init__
    qta.load_font("myicons", "myicons.ttf", "myicons-charmap.json")
  File "/home/.local/lib/python3.8/site-packages/qtawesome/__init__.py", line 216, in load_font
    return _instance().load_font(prefix, ttf_filename, charmap_filename, directory)
  File "/home/.local/lib/python3.8/site-packages/qtawesome/iconic_font.py", line 285, in load_font
    with open(os.path.join(directory, ttf_filename), 'rb') as font_data:
FileNotFoundError: [Errno 2] No such file or directory: '/home/.local/lib/python3.8/site-packages/qtawesome/fonts/myicons.ttf'

[kumattau]

We may need to consider carefully whether to fix the problem
because it is possible that there are applications depending on the incorrect behavior of directory=None.

There is qta.load_font('spyder', 'spyder.ttf', 'spyder-charmap.json') in the document,
but spyder sets directory argument explicitly.
So spyder does not depends on the incorrect behavior of directory=None at least.

https://github.com/spyder-ide/spyder/blob/7418676022a5ddaedaff562cbff822410856fc99/spyder/utils/icon_manager.py#L376-L377

[dalthviz]

Thank you for the feedback @kumattau ! Seems like there is an inconsistency between the current functionality implemented and the docs. I think we need to change the docstring to say something along the lines of:

If directory is None, the files will be looked for in the QtAwesome `fonts` directory.

What do you think @kumattau ?

[kumattau]

@dalthviz

I think it is better to change docs keeping current API behaivor for backward compatibility.

[kumattau]

Additionally, I think 2 contrasted examples (with directory and without directory) are needed for users to understand the usage like as follows:

# cp myicon.ttf myicon-charmap.json /path/to/lib/python/site-packages/qtawesome/fonts/

qta.load_font('myicon', 'myicon.ttf', 'myicon-charmap.json')

# cp myicon.ttf myicon-charmap.json /path/to/myproject

qta.load_font('myicon', 'myicon.ttf', 'myicon-charmap.json', directory='/path/to/myproject')