Allow finger indices to be specified for chords

[frankdeath]

Allow the finger indices to be specified for chords, either inside the circles or below the fretboard like this (or both):

https://upload.wikimedia.org/wikipedia/commons/thumb/3/32/G_major_chord_for_guitar_%28open%29.svg/198px-G_major_chord_for_guitar_%28open%29.svg.png

If there is already a way to do that, it isn't obvious to me.

[EricDuminil]

I couldn't find a way to specify a custom text inside the circles, at least not without modifying the library.

It's not too hard to replace the tuning text with finger indices, though.

Here's a working example, which should create G, Am, B7 and Dm chords:

from fretboardgtr import ChordGtr

"""Display the finger indices for chord, instead of the tuning"""

def chord_with_finger_indices(which_frets, which_fingers, pathname, extension='png'):
    ## Draw the chord, without showing tuning
    F=ChordGtr(fingering=which_frets)
    F.theme(show_note_name=False,
            show_degree_name=False,
            color_chord=False,
            open_color_chord=False,
            show_tun=False,
            fontsize_bottom_tuning=40  # Will be used for finger indices
            )
    F.pathname(pathname + '.svg')
    F.draw()

    ## Hack: Display the finger indices instead of the tuning.
    F.tuning = which_fingers
    #NOTE: Don't draw again, it would break the logic. Only show_tuning()
    F.show_tuning()

    F.save(extension=extension)

chord_with_finger_indices([3, 2, 0, 0, 0, 3], # Which frets are played?
                          ['2', '1', ' ', ' ', ' ', '3'], # With which fingers?
                          'g_chord', 'png')

chord_with_finger_indices([None, 0, 2, 2, 1, 0],
                          [' ', ' ', '2', '3', '1', ' '],
                          'am_chord', 'png')

chord_with_finger_indices([None, 2, 1, 2, 0, 2],
                          [' ', '2', '1', '3', ' ', '4'],
                          'b7_chord', 'png')

chord_with_finger_indices([None, None, 0, 2, 3, 1],
                          [' ', ' ', ' ', '2', '3', '1'],
                          'dm_chord', 'png')

Here's the output for G and Dm: