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Add XDG JSON theme, font and button configuration with installer repair
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#include "config.hpp"
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#include <algorithm>
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#include <cctype>
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#include <chrono>
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#include <cstdlib>
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#include <fstream>
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#include <stdexcept>
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#include <string_view>
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namespace frameyap {
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namespace {
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struct Json {
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std::string value;
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std::map<std::string, Json> object;
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bool is_string = false, is_object = false;
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};
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struct Parser {
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std::string_view s;
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size_t pos = 0;
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void ws() { while (pos < s.size() && (s[pos] == ' ' || s[pos] == '\n' || s[pos] == '\r' || s[pos] == '\t')) ++pos; }
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bool eat(char c) { ws(); if (pos < s.size() && s[pos] == c) { ++pos; return true; } return false; }
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[[noreturn]] void fail() const { throw std::runtime_error("Invalid FrameYap JSON config at byte " + std::to_string(pos)); }
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std::string str() {
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if (!eat('"')) fail();
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std::string out;
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while (pos < s.size()) {
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unsigned char c = s[pos++];
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if (c == '"') return out;
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if (c < 0x20) fail();
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if (c != '\\') { out += char(c); continue; }
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if (pos == s.size()) fail();
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c = s[pos++];
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switch (c) {
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case '"': case '\\': case '/': out += char(c); break;
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case 'b': out += '\b'; break; case 'f': out += '\f'; break;
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case 'n': out += '\n'; break; case 'r': out += '\r'; break; case 't': out += '\t'; break;
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case 'u': {
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auto hex = [&]() {
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unsigned n = 0;
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for (int i = 0; i < 4; ++i) {
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if (pos == s.size()) fail();
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char h = s[pos++];
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if (!std::isxdigit(static_cast<unsigned char>(h))) fail();
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n = n * 16 + (h <= '9' ? h - '0' : (h <= 'F' ? h - 'A' + 10 : h - 'a' + 10));
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}
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return n;
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};
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unsigned cp = hex();
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if (cp >= 0xd800 && cp <= 0xdbff) {
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if (pos + 2 > s.size() || s.substr(pos, 2) != "\\u") fail();
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pos += 2;
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unsigned low = hex();
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if (low < 0xdc00 || low > 0xdfff) fail();
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cp = 0x10000 + ((cp - 0xd800) << 10) + low - 0xdc00;
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} else if (cp >= 0xdc00 && cp <= 0xdfff) fail();
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if (cp < 0x80) out += char(cp);
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else if (cp < 0x800) { out += char(0xc0 | (cp >> 6)); out += char(0x80 | (cp & 63)); }
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else if (cp < 0x10000) { out += char(0xe0 | (cp >> 12)); out += char(0x80 | ((cp >> 6) & 63)); out += char(0x80 | (cp & 63)); }
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else { out += char(0xf0 | (cp >> 18)); out += char(0x80 | ((cp >> 12) & 63)); out += char(0x80 | ((cp >> 6) & 63)); out += char(0x80 | (cp & 63)); }
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break;
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}
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default: fail();
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}
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}
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fail();
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}
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Json parse(unsigned depth = 0) {
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if (depth > 8) fail();
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ws();
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if (pos == s.size()) fail();
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Json result;
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if (s[pos] == '"') { result.value = str(); result.is_string = true; return result; }
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if (eat('{')) {
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result.is_object = true;
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if (eat('}')) return result;
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do {
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ws(); if (pos == s.size() || s[pos] != '"') fail();
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auto key = str();
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if (!eat(':')) fail();
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auto [it, inserted] = result.object.emplace(std::move(key), parse(depth + 1));
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if (!inserted) fail();
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if (eat('}')) return result;
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} while (eat(','));
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fail();
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}
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if (eat('[')) {
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if (eat(']')) return result;
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do { parse(depth + 1); if (eat(']')) return result; } while (eat(','));
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fail();
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}
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size_t start = pos;
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if (s.substr(pos, 4) == "true" || s.substr(pos, 4) == "null") pos += 4;
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else if (s.substr(pos, 5) == "false") pos += 5;
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else {
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if (s[pos] == '-') ++pos;
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if (pos == s.size()) fail();
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if (s[pos] == '0') ++pos;
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else { if (s[pos] < '1' || s[pos] > '9') fail(); while (pos < s.size() && std::isdigit(static_cast<unsigned char>(s[pos]))) ++pos; }
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if (pos < s.size() && s[pos] == '.') { ++pos; size_t at = pos; while (pos < s.size() && std::isdigit(static_cast<unsigned char>(s[pos]))) ++pos; if (at == pos) fail(); }
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if (pos < s.size() && (s[pos] == 'e' || s[pos] == 'E')) {
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++pos; if (pos < s.size() && (s[pos] == '-' || s[pos] == '+')) ++pos;
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size_t at = pos; while (pos < s.size() && std::isdigit(static_cast<unsigned char>(s[pos]))) ++pos;
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if (at == pos) fail();
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}
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}
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if (pos == start) fail();
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return result;
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}
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};
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Rgba color(const Json& json) {
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if (!json.is_string || json.value.size() != 7 || json.value[0] != '#')
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throw std::runtime_error("Theme colors must be #RRGGBB strings");
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Rgba c{0, 0, 0, 255};
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for (int i = 0; i < 3; ++i) {
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auto digit = [](char ch) -> int {
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if (ch >= '0' && ch <= '9') return ch - '0';
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if (ch >= 'a' && ch <= 'f') return ch - 'a' + 10;
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if (ch >= 'A' && ch <= 'F') return ch - 'A' + 10;
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return -1;
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};
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int hi = digit(json.value[1 + 2*i]), lo = digit(json.value[2 + 2*i]);
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if (hi < 0 || lo < 0) throw std::runtime_error("Theme colors must be #RRGGBB strings");
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c[i] = static_cast<unsigned char>(hi * 16 + lo);
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}
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return c;
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}
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std::filesystem::path xdg_root(const char* variable, const char* fallback) {
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const char* env = std::getenv(variable);
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if (env && *env && std::filesystem::path(env).is_absolute()) return env;
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const char* home = std::getenv("HOME");
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if (home && *home && std::filesystem::path(home).is_absolute()) return std::filesystem::path(home) / fallback;
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return {};
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}
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std::string read_file(const std::filesystem::path& p) {
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std::ifstream in(p, std::ios::binary);
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if (!in) throw std::runtime_error("Cannot read " + p.string());
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std::string data;
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char buf[4097];
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in.read(buf, sizeof(buf));
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if (in.gcount() == sizeof(buf)) throw std::runtime_error("FrameYap config/input file too large: " + p.string());
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data.assign(buf, size_t(in.gcount()));
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return data;
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}
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void write_file(const std::filesystem::path& path, const std::string& content) {
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auto temporary = path.string() + ".tmp." + std::to_string(std::chrono::steady_clock::now().time_since_epoch().count());
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try {
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{
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std::ofstream out(temporary, std::ios::binary | std::ios::trunc);
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out << content;
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if (!out) throw std::runtime_error("Could not write generated OpenVR binding: " + path.string());
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}
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std::filesystem::rename(temporary, path);
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} catch (...) {
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std::error_code ignored;
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std::filesystem::remove(temporary, ignored);
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throw;
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}
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}
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} // namespace
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std::filesystem::path default_config_path() {
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auto root = xdg_root("XDG_CONFIG_HOME", ".config");
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return root.empty() ? root : root / "frameyap/config.json";
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}
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Config load_config(const std::filesystem::path& path) {
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Config config;
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if (path.empty() || !std::filesystem::exists(path)) return config;
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auto bytes = read_file(path);
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Parser parser{bytes};
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auto root = parser.parse(); parser.ws();
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if (parser.pos != bytes.size() || !root.is_object) throw std::runtime_error("Invalid FrameYap config object: " + path.string());
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for (const auto& [key, value] : root.object) {
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if (key == "font") {
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if (!value.is_string) throw std::runtime_error("Config font must be a path string");
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config.font = value.value;
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} else if (key == "theme") {
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if (!value.is_object) throw std::runtime_error("Config theme must be an object");
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for (const auto& [name, v] : value.object) {
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Rgba* target = nullptr;
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if (name == "background") target = &config.theme.background;
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else if (name == "card") target = &config.theme.card;
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else if (name == "ink") target = &config.theme.ink;
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else if (name == "muted") target = &config.theme.muted;
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else if (name == "accent") target = &config.theme.accent;
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else if (name == "warning") target = &config.theme.warning;
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else if (name == "frame_start") target = &config.theme.frame_start;
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else if (name == "frame_end") target = &config.theme.frame_end;
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else throw std::runtime_error("Unknown theme color: " + name);
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*target = color(v);
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}
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} else if (key == "buttons") {
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if (!value.is_object) throw std::runtime_error("Config buttons must be an object");
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for (const auto& [name, v] : value.object) {
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if (name != "left_grip" && name != "right_grip" && name != "ptt" && name != "cancel" && name != "insert" && name != "enter")
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throw std::runtime_error("Unknown OpenVR button action: " + name);
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if (!v.is_string) throw std::runtime_error("Button path must be a string");
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auto path = v.value;
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if (!path.empty()) {
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auto valid = [](std::string_view prefix, const std::string& path) {
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return path.starts_with(prefix) && path.size() > prefix.size() &&
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std::all_of(path.begin() + prefix.size(), path.end(), [](unsigned char c) {
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return (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') ||
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(c >= '0' && c <= '9') || c == '_';
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});
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};
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if (!valid("/user/hand/left/input/", path) && !valid("/user/hand/right/input/", path))
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throw std::runtime_error("Invalid Frame controller button path: " + path);
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}
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config.buttons[name] = path;
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}
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} else throw std::runtime_error("Unknown FrameYap config key: " + key);
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}
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return config;
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}
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std::string resolve_font(const std::string& assets, const std::string& requested) {
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const auto bundled = std::filesystem::path(assets) / "fonts/Inconsolata-Regular.ttf";
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const std::array<std::filesystem::path, 4> candidates{requested, bundled,
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"/usr/share/fonts/truetype/dejavu/DejaVuSans.ttf", "/usr/share/fonts/TTF/DejaVuSans.ttf"};
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for (const auto& candidate : candidates)
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if (!candidate.empty() && std::filesystem::is_regular_file(candidate)) return candidate.string();
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throw std::runtime_error("No panel font found (set font in config.json or install bundled font)");
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}
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std::filesystem::path action_manifest(const std::string& assets, const Config& config) {
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auto source = std::filesystem::absolute(std::filesystem::path(assets) / "actions.json");
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if (config.buttons.empty()) return source;
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auto root = xdg_root("XDG_CACHE_HOME", ".cache");
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if (root.empty()) throw std::runtime_error("No absolute XDG_CACHE_HOME or HOME for generated bindings");
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auto dir = root / "frameyap/bindings";
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std::filesystem::create_directories(dir);
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std::map<std::string, std::string> buttons{{"left_grip", "/user/hand/left/input/grip"},
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{"right_grip", "/user/hand/right/input/grip"}, {"ptt", "/user/hand/right/input/x"}};
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for (const auto& [key, path] : config.buttons) buttons[key] = path;
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std::string binding = "{\"controller_type\":\"frame_controller\",\"name\":\"FrameYap configured controls\",\"bindings\":{\"/actions/frameyap\":{\"sources\":[";
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std::map<std::string, std::string> used;
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for (const auto& [action, path] : buttons) {
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if (path.empty()) continue;
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if (!used.emplace(path, action).second) throw std::runtime_error("Two actions share Frame button: " + path);
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if (binding.back() != '[') binding += ',';
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binding += "{\"path\":\"" + path + "\",\"mode\":\"button\",\"inputs\":{\"click\":{\"output\":\"/actions/frameyap/in/" + action + "\"}}}";
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}
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binding += "]}}}";
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auto manifest = read_file(source);
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// The OpenVR SDK resolves relative binding URLs beside its manifest.
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write_file(dir / "bindings_frame_controller.json", binding);
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write_file(dir / "bindings_knuckles.json", read_file(std::filesystem::path(assets) / "bindings_knuckles.json"));
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write_file(dir / "actions.json", manifest);
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return dir / "actions.json";
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}
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} // namespace frameyap
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