Add XDG JSON theme, font and button configuration with installer repair

tests/config_test.cpp

@@ -0,0 +1,61 @@
+#include "config.hpp"
+#include <cassert>
+#include <cstdlib>
+#include <filesystem>
+#include <fstream>
+#include <stdexcept>
+#include <string>
+#include <unistd.h>
+using namespace frameyap;
+namespace {
+void put(const std::filesystem::path& p, const std::string& s) { std::ofstream out(p); out << s; assert(out); }
+std::string get(const std::filesystem::path& p) { std::ifstream in(p); return {std::istreambuf_iterator<char>(in), {}}; }
+template<class Fn> void fails(Fn fn) { bool raised = false; try { fn(); } catch (const std::exception&) { raised = true; } assert(raised); }
+}
+int main(int argc, char** argv) {
+    assert(argc == 2);
+    const auto dir = std::filesystem::temp_directory_path() / ("frameyap-config-test-" + std::to_string(::getpid()));
+    std::filesystem::create_directories(dir);
+    ::setenv("XDG_CONFIG_HOME", dir.c_str(), 1);
+    ::setenv("XDG_CACHE_HOME", dir.c_str(), 1);
+    auto path = default_config_path();
+    assert(path == dir / "frameyap/config.json");
+    ::setenv("XDG_CONFIG_HOME", "relative", 1);
+    ::setenv("HOME", dir.c_str(), 1);
+    assert(default_config_path() == dir / ".config/frameyap/config.json");
+    ::unsetenv("HOME");
+    assert(default_config_path().empty());
+    ::setenv("XDG_CONFIG_HOME", dir.c_str(), 1);
+    assert(load_config(path).buttons.empty());
+    auto example = load_config(std::filesystem::path(argv[1]) / "config.example.json");
+    assert(example.buttons.at("ptt") == "/user/hand/right/input/x");
+    assert(example.font.empty());
+    std::filesystem::create_directories(path.parent_path());
+    put(path, R"({"theme":{"background":"#123ABC","accent":"#abcdef","frame_end":"#010203"},"font":"/nonexistent/face.ttf","buttons":{"ptt":"/user/hand/left/input/y","cancel":"/user/hand/right/input/b","right_grip":""}})");
+    auto config = load_config(path);
+    assert((config.theme.background == Rgba{0x12, 0x3a, 0xbc, 255}));
+    assert((config.theme.accent == Rgba{0xab, 0xcd, 0xef, 255}));
+    assert(config.buttons.at("right_grip").empty());
+    assert(resolve_font(argv[1], config.font) == (std::filesystem::path(argv[1]) / "fonts/Inconsolata-Regular.ttf").string());
+    auto manifest = action_manifest(argv[1], config);
+    assert(std::filesystem::is_regular_file(manifest));
+    assert(get(manifest).find("bindings_frame_controller.json") != std::string::npos);
+    auto generated = get(manifest.parent_path() / "bindings_frame_controller.json");
+    assert(generated.find("/user/hand/left/input/y") != std::string::npos);
+    assert(generated.find("/actions/frameyap/in/cancel") != std::string::npos);
+    assert(generated.find("/actions/frameyap/in/right_grip") == std::string::npos);
+    assert(action_manifest(argv[1], {}) == std::filesystem::absolute(std::filesystem::path(argv[1]) / "actions.json"));
+    put(path, R"({"buttons":{"ptt":"/user/hand/left/input/grip"}})");
+    fails([&] { action_manifest(argv[1], load_config(path)); }); // overlapping bindings are never silently chosen
+    put(path, R"({"buttons":{"ptt":"/user/hand/left/input/x\"}hack"}})");
+    fails([&] { load_config(path); });
+    put(path, R"({"theme":{"ink":"#FG0000"}})");
+    fails([&] { load_config(path); });
+    put(path, R"({"font":42})");
+    fails([&] { load_config(path); });
+    put(path, R"({"font":"a","font":"b"})");
+    fails([&] { load_config(path); });
+    put(path, "{\"font\":\"broken\"");
+    fails([&] { load_config(path); });
+    std::filesystem::remove_all(dir);
+}