sysfiles.py

'''
Operations about system files.
'''
import os.path as osp
import matplotlib.font_manager as mfm
import sys

def systemFontPath():
    'Return the path of system font'
    return osp.dirname(mfm.findSystemFonts()[0])

def addPath(filename):
    'Return the path of filename in system font directory'
    return osp.join(systemFontPath(), filename)

def defaultFont():
    'Return a default monospace font path'
    fnlist = [osp.basename(font) for font in mfm.findSystemFonts()]
    expected = ['simsun.ttc', 'simkai.ttf', 'simhei.ttf']
    for fn in expected:
        if fn in fnlist:
            return addPath(fn)
    return mfm.findSystemFonts()[0] # Just assume it works lol

def fontExist(filename):
    'Return True if filename exists in system font directory'
    return osp.exists(addPath(filename))

def hanFont():
    'Return the expected font for Chinese characters. By default it should be ./fonts/SourceHanSerifSC-Regular.otf'
    if osp.exists('./fonts/SourceHanSerifSC-Regular.otf'):
        return './fonts/SourceHanSerifSC-Regular.otf'
    elif fontExist('SourceHanSerifSC-Regular.otf'):
        return addPath('SourceHanSerifSC-Regular.otf')
    else:
        return defaultFont()