测试是否安装了Font

#include<iostream>
#include<fstream>
#include<vector>

bool is_font_installed(const std::string& font_name) {
    /* 检查路径 /usr/share/fonts 中是否存在指定的字体 */
    std::string font_path = "/usr/share/fonts";
    std::vector<std::string> font_list = {};

    std::ifstream f(font_path, std::ios::binary);
    if (!f.fail()) {
        std::string current_font;
        while (getline(f, current_font)) {
            font_list.push_back(current_font);
        }
        return std::find(font_list.begin(), font_list.end(), font_name) != font_list.end();
    }
    f.close();
    return false;
}

int main() {
    std::string font_name = "Roboto-Regular.ttf";
    bool installed = is_font_installed(font_name);

    std::cout << "字体 "<< font_name << " 是否已安装为： "<< installed<< std::endl;
    return 0;
}

import re
import os
from fontTools.ttLib import TTFont

def is_font_installed(font_name):
    os_path = os.getcwd()
    fs_path = os.path.join(os_path, "/usr/share/fonts")

    fonts = os.listdir(fs_path)
    for font in fonts:
        if re.match(re.compile(font_name), f"{os.path.join(fs_path, font)}"):
            return True
    return False

f1 = TTFont("Roboto-Regular.ttf")
if f1.fontName:
    print(f1.fontName)
else:
    print("未找到字体")
# 结果：Roboto-Regular.ttf 是否已安装为： False