src/Config.cpp


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#include "../include/Config.hpp"
#include "../include/Storage.hpp"
#include <assert.h>

namespace QuickMedia {
    static bool config_initialized = false;
    static Config *config = nullptr;

    static float scale = 1.0f;
    static bool scale_set = false;

    static const int XFT_DPI_DEFAULT = 96;
    // Returns XFT_DPI_DEFAULT on error
    static int xrdb_get_dpi() {
        int xft_dpi = XFT_DPI_DEFAULT;

        FILE *xrdb_query = popen("xrdb -query", "r");
        if(!xrdb_query)
            return xft_dpi;

        char line[512];
        while(fgets(line, sizeof(line), xrdb_query)) {
            int line_length = strlen(line);
            if(line_length > 0 && line[line_length - 1] == '\n') {
                line[line_length - 1] = '\0';
                line_length--;
            }

            if(line_length > 8 && memcmp(line, "Xft.dpi:", 8) == 0) {
                int xft_dpi_file = atoi(line + 8);
                if(xft_dpi_file > 0) {
                    xft_dpi = xft_dpi_file;
                    break;
                }
            }
        }

        pclose(xrdb_query);
        return xft_dpi;
    }

    static float get_ui_scale() {
        if(scale_set)
            return scale;

        char *gdk_scale = getenv("GDK_SCALE");
        if(gdk_scale) {
            setlocale(LC_ALL, "C"); // Sigh... stupid C
            scale = atof(gdk_scale);
            if(scale < 0.0001f)
                scale = 1.0f;
        } else {
            scale = (float)xrdb_get_dpi() / (float)XFT_DPI_DEFAULT;
        }

        scale_set = true;
        return scale;
    }

    // No-op if this has already been called before
    void init_config() {
        if(config_initialized)
            return;

        config_initialized = true;
        // Wtf? can't use static non-pointer config because it causes a segfault when setting config.theme.
        // It looks like a libc bug??? crashes for both gcc and clang.
        config = new Config();
        Path config_path = get_storage_dir().join("config.json");
        Json::Value json_root;
        if(!read_file_as_json(config_path, json_root) || !json_root.isObject()) {
            fprintf(stderr, "Warning: failed to parse config file: %s\n", config_path.data.c_str());
            config->scale = get_ui_scale();
            return;
        }

        const Json::Value &search_json = json_root["search"];
        if(search_json.isObject()) {
            const Json::Value &font_size_json = search_json["font_size"];
            if(font_size_json.isNumeric())
                config->search.font_size = font_size_json.asDouble();
        }

        const Json::Value &tab_json = json_root["tab"];
        if(tab_json.isObject()) {
            const Json::Value &font_size_json = tab_json["font_size"];
            if(font_size_json.isNumeric())
                config->tab.font_size = font_size_json.asDouble();
        }

        const Json::Value &body_json = json_root["body"];
        if(body_json.isObject()) {
            const Json::Value &title_font_size = body_json["title_font_size"];
            if(title_font_size.isNumeric())
                config->body.title_font_size = title_font_size.asDouble();

            const Json::Value &author_font_size = body_json["author_font_size"];
            if(author_font_size.isNumeric())
                config->body.author_font_size = author_font_size.asDouble();

            const Json::Value &description_font_size = body_json["description_font_size"];
            if(description_font_size.isNumeric())
                config->body.description_font_size = description_font_size.asDouble();

            const Json::Value &timestamp_font_size = body_json["timestamp_font_size"];
            if(timestamp_font_size.isNumeric())
                config->body.timestamp_font_size = timestamp_font_size.asDouble();

            const Json::Value &reaction_font_size = body_json["reaction_font_size"];
            if(reaction_font_size.isNumeric())
                config->body.reaction_font_size = reaction_font_size.asDouble();

            const Json::Value &embedded_load_font_size = body_json["embedded_load_font_size"];
            if(embedded_load_font_size.isNumeric())
                config->body.embedded_load_font_size = embedded_load_font_size.asDouble();
        }

        const Json::Value &input_json = json_root["input"];
        if(input_json.isObject()) {
            const Json::Value &font_size_json = input_json["font_size"];
            if(font_size_json.isNumeric())
                config->input.font_size = font_size_json.asDouble();
        }

        const Json::Value &use_system_fonts_json = json_root["use_system_fonts"];
        if(use_system_fonts_json.isBool())
            config->use_system_fonts = use_system_fonts_json.asBool();

        const Json::Value &use_system_mpv_config = json_root["use_system_mpv_config"];
        if(use_system_mpv_config.isBool())
            config->use_system_mpv_config = use_system_mpv_config.asBool();

        const Json::Value &theme_json = json_root["theme"];
        if(theme_json.isString())
            config->theme = theme_json.asString();

        const Json::Value &scale_json = json_root["scale"];
        if(scale_json.isNumeric())
            config->scale = scale_json.asDouble();
        else
            config->scale = get_ui_scale();

        const Json::Value &font_scale = json_root["font_scale"];
        if(font_scale.isNumeric())
            config->font_scale = font_scale.asDouble();
    }

    const Config& get_config() {
        init_config();
        return *config;
    }
}