evan
b3b5a9b2a3
Keeps one writer for saved state: ui.setTheme() writes through settings.setTheme() and then reloads the palette C cannot see.
129 lines
3.5 KiB
C++
129 lines
3.5 KiB
C++
#include "settings.h"
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#include <SD.h>
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extern "C" {
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#include <lauxlib.h>
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#include <lua.h>
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}
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Settings settings;
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static constexpr const char* PATH = "/settings.lua";
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static constexpr const char* TEMP_PATH = "/settings.tmp";
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static constexpr const char* BACKUP_PATH = "/settings.bak";
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static int16_t fieldOr(lua_State* L, const char* key, int16_t fallback) {
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lua_getfield(L, -1, key);
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int16_t value = lua_isinteger(L, -1) ? lua_tointeger(L, -1) : fallback;
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lua_pop(L, 1);
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return value;
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}
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static String stringFieldOr(lua_State* L, const char* key,
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const String& fallback) {
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lua_getfield(L, -1, key);
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String value = lua_isstring(L, -1) ? lua_tostring(L, -1) : fallback;
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lua_pop(L, 1);
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return value;
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}
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static String luaString(const String& value) {
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String out = "\"";
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for (size_t i = 0; i < value.length(); i++) {
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unsigned char c = value[i];
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if (c == '\\' || c == '\"') {
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out += '\\';
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out += (char)c;
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} else if (c >= 32 && c < 127) {
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out += (char)c;
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} else {
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char escaped[5];
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snprintf(escaped, sizeof(escaped), "\\%03u", c);
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out += escaped;
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}
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}
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out += '\"';
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return out;
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}
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bool Settings::setRotation(int16_t degrees) {
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if (degrees % 90 != 0 || degrees < 0 || degrees > 270)
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return false;
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rotation = degrees;
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return true;
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}
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bool Settings::load() {
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File f = SD.open(PATH);
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if (!f)
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return false;
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String source = f.readString();
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f.close();
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lua_State* L = luaL_newstate();
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if (!L)
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return false;
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bool ok =
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luaL_loadbuffer(L, source.c_str(), source.length(), PATH) == LUA_OK &&
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lua_pcall(L, 0, 1, 0) == LUA_OK && lua_istable(L, -1);
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if (ok) {
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rotation = fieldOr(L, "rotation", rotation);
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timezone = stringFieldOr(L, "timezone", timezone);
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theme = stringFieldOr(L, "theme", theme);
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lua_getfield(L, -1, "touch");
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if (lua_istable(L, -1)) {
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touchX0 = fieldOr(L, "x0", touchX0);
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touchY0 = fieldOr(L, "y0", touchY0);
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touchX1 = fieldOr(L, "x1", touchX1);
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touchY1 = fieldOr(L, "y1", touchY1);
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}
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lua_pop(L, 1);
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lua_getfield(L, -1, "wifi");
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if (lua_istable(L, -1)) {
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wifiSsid = stringFieldOr(L, "ssid", wifiSsid);
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wifiPassword = stringFieldOr(L, "password", wifiPassword);
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}
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lua_pop(L, 1);
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}
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lua_close(L);
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return ok;
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}
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bool Settings::save() const {
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String source = "return {\n rotation = " + String(rotation) + ",\n";
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source += " timezone = " + luaString(timezone) + ",\n";
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source += " theme = " + luaString(theme) + ",\n";
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source += " touch = { x0 = " + String(touchX0) +
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", y0 = " + String(touchY0) + ", x1 = " + String(touchX1) +
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", y1 = " + String(touchY1) + " },\n";
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source += " wifi = { ssid = " + luaString(wifiSsid) +
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", password = " + luaString(wifiPassword) + " },\n}\n";
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if (SD.exists(TEMP_PATH))
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SD.remove(TEMP_PATH);
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File f = SD.open(TEMP_PATH, FILE_WRITE);
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if (!f)
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return false;
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bool ok = f.write(reinterpret_cast<const uint8_t*>(source.c_str()),
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source.length()) == source.length();
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f.close();
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if (!ok) {
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SD.remove(TEMP_PATH);
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return false;
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}
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if (SD.exists(BACKUP_PATH))
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SD.remove(BACKUP_PATH);
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bool hadSettings = SD.exists(PATH);
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if (hadSettings && !SD.rename(PATH, BACKUP_PATH))
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return false;
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if (SD.rename(TEMP_PATH, PATH)) {
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if (hadSettings)
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SD.remove(BACKUP_PATH);
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return true;
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}
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if (hadSettings)
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SD.rename(BACKUP_PATH, PATH);
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return false;
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}
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