First pass at custom app-settings support (#1381)

* First draft of custom app settings support.

* WIP new settings

* Working per-app custom settings

* Revert design to use "bound settings"

firmware/application/app_settings.cpp

@@ -23,7 +23,9 @@
 
 #include "app_settings.hpp"
 
+#include "convert.hpp"
 #include "file.hpp"
+#include "file_reader.hpp"
 #include "portapack.hpp"
 #include "portapack_persistent_memory.hpp"
 #include "utility.hpp"
@@ -36,6 +38,126 @@ namespace fs = std::filesystem;
 using namespace portapack;
 using namespace std::literals;
 
+namespace {
+fs::path get_settings_path(const std::string& app_name) {
+    return fs::path{u"/SETTINGS"} / app_name + u".ini";
+}
+}  // namespace
+
+void BoundSetting::parse(std::string_view value) {
+    switch (type_) {
+        case SettingType::I64:
+            parse_int(value, as<int64_t>());
+            break;
+        case SettingType::I32:
+            parse_int(value, as<int32_t>());
+            break;
+        case SettingType::U32:
+            parse_int(value, as<uint32_t>());
+            break;
+        case SettingType::U8:
+            parse_int(value, as<uint8_t>());
+            break;
+        case SettingType::String:
+            as<std::string>() = std::string{value};
+            break;
+        case SettingType::Bool: {
+            int parsed = 0;
+            parse_int(value, parsed);
+            as<bool>() = (parsed != 0);
+            break;
+        }
+    };
+}
+
+void BoundSetting::write(File& file) const {
+    // NB: Write directly without allocations. This happens on every
+    // app exit when enabled so should be fast to keep the UX responsive.
+    StringFormatBuffer buffer;
+    size_t length = 0;
+
+    file.write(name_.data(), name_.length());
+    file.write("=", 1);
+
+    switch (type_) {
+        case SettingType::I64:
+            file.write(to_string_dec_int(as<int64_t>(), buffer, length), length);
+            break;
+        case SettingType::I32:
+            file.write(to_string_dec_int(as<int32_t>(), buffer, length), length);
+            break;
+        case SettingType::U32:
+            file.write(to_string_dec_uint(as<uint32_t>(), buffer, length), length);
+            break;
+        case SettingType::U8:
+            file.write(to_string_dec_uint(as<uint8_t>(), buffer, length), length);
+            break;
+        case SettingType::String: {
+            const auto& str = as<std::string>();
+            file.write(str.data(), str.length());
+            break;
+        }
+        case SettingType::Bool:
+            file.write(as<bool>() ? "1" : "0", 1);
+            break;
+    }
+
+    file.write("\r\n", 2);
+}
+
+SettingsStore::SettingsStore(std::string_view store_name, SettingBindings bindings)
+    : store_name_{store_name}, bindings_{bindings} {
+    load_settings(store_name_, bindings_);
+}
+
+SettingsStore::~SettingsStore() {
+    save_settings(store_name_, bindings_);
+}
+
+bool load_settings(std::string_view store_name, SettingBindings& bindings) {
+    File f;
+    auto path = get_settings_path(std::string{store_name});
+
+    auto error = f.open(path);
+    if (error)
+        return false;
+
+    auto reader = FileLineReader(f);
+    for (const auto& line : reader) {
+        auto cols = split_string(line, '=');
+
+        if (cols.size() != 2)
+            continue;
+
+        // Find a binding with the name.
+        auto it = std::find_if(
+            bindings.begin(), bindings.end(),
+            [name = cols[0]](auto& bound_setting) {
+                return name == bound_setting.name();
+            });
+
+        // If found, parse the value.
+        if (it != bindings.end())
+            it->parse(cols[1]);
+    }
+
+    return true;
+}
+
+bool save_settings(std::string_view store_name, const SettingBindings& bindings) {
+    File f;
+    auto path = get_settings_path(std::string{store_name});
+
+    auto error = f.create(path);
+    if (error)
+        return false;
+
+    for (const auto& bound_setting : bindings)
+        bound_setting.write(f);
+
+    return true;
+}
+
 namespace app_settings {
 
 template <typename T>
@@ -64,10 +186,6 @@ static void write_setting(File& file, std::string_view setting_name, const T& va
     file.write("\r\n", 2);
 }
 
-static fs::path get_settings_path(const std::string& app_name) {
-    return fs::path{u"/SETTINGS"} / app_name + u".ini";
-}
-
 namespace setting {
 constexpr std::string_view baseband_bandwidth = "baseband_bandwidth="sv;
 constexpr std::string_view sampling_rate = "sampling_rate="sv;
@@ -88,13 +206,6 @@ constexpr std::string_view squelch = "squelch="sv;
 constexpr std::string_view volume = "volume="sv;
 }  // namespace setting
 
-// TODO: Only load/save values that are declared used.
-// This will prevent switching apps from changing setting unnecessarily.
-// TODO: Track which values are actually read.
-// TODO: Maybe just use a dictionary which would allow for custom settings.
-// TODO: Create a control value binding which will allow controls to
-//       be declaratively bound to a setting and persistence will be magic.
-
 ResultCode load_settings(const std::string& app_name, AppSettings& settings) {
     if (!portapack::persistent_memory::load_app_settings())
         return ResultCode::SettingsDisabled;

firmware/application/app_settings.hpp

@@ -2,6 +2,7 @@
  * Copyright (C) 2015 Jared Boone, ShareBrained Technology, Inc.
  * Copyright (C) 2016 Furrtek
  * Copyright (C) 2022 Arjan Onwezen
+ * Copyright (C) 2023 Kyle Reed
  *
  * This file is part of PortaPack.
  *
@@ -27,12 +28,77 @@
 #include <cstddef>
 #include <cstdint>
 #include <string>
+#include <string_view>
 #include <utility>
+#include <variant>
 
 #include "file.hpp"
 #include "max283x.hpp"
 #include "string_format.hpp"
 
+/* Represents a named setting bound to a variable instance. */
+/* Using void* instead of std::variant, because variant is a pain to dispatch over. */
+class BoundSetting {
+    /* The type of bound setting. */
+    enum class SettingType : uint8_t {
+        I64,
+        I32,
+        U32,
+        U8,
+        String,
+        Bool,
+    };
+
+   public:
+    BoundSetting(std::string_view name, int64_t* target)
+        : name_{name}, target_{target}, type_{SettingType::I64} {}
+
+    BoundSetting(std::string_view name, int32_t* target)
+        : name_{name}, target_{target}, type_{SettingType::I32} {}
+
+    BoundSetting(std::string_view name, uint32_t* target)
+        : name_{name}, target_{target}, type_{SettingType::U32} {}
+
+    BoundSetting(std::string_view name, uint8_t* target)
+        : name_{name}, target_{target}, type_{SettingType::U8} {}
+
+    BoundSetting(std::string_view name, std::string* target)
+        : name_{name}, target_{target}, type_{SettingType::String} {}
+
+    BoundSetting(std::string_view name, bool* target)
+        : name_{name}, target_{target}, type_{SettingType::Bool} {}
+
+    std::string_view name() const { return name_; }
+    void parse(std::string_view value);
+    void write(File& file) const;
+
+   private:
+    template <typename T>
+    constexpr auto& as() const {
+        return *reinterpret_cast<T*>(target_);
+    }
+
+    std::string_view name_;
+    void* target_;
+    SettingType type_;
+};
+
+using SettingBindings = std::vector<BoundSetting>;
+
+/* RAII wrapper for Settings that loads/saves to the SD card. */
+class SettingsStore {
+   public:
+    SettingsStore(std::string_view store_name, SettingBindings bindings);
+    ~SettingsStore();
+
+   private:
+    std::string_view store_name_;
+    SettingBindings bindings_;
+};
+
+bool load_settings(std::string_view store_name, SettingBindings& bindings);
+bool save_settings(std::string_view store_name, const SettingBindings& bindings);
+
 namespace app_settings {
 
 enum class ResultCode : uint8_t {

firmware/application/apps/pocsag_app.cpp

@@ -71,6 +71,8 @@ POCSAGAppView::POCSAGAppView(NavigationView& nav)
     if (!settings_.loaded())
         field_frequency.set_value(initial_target_frequency);
 
+    check_log.set_value(enable_logging);
+
     receiver_model.enable();
 
     // TODO: app setting instead?
@@ -88,7 +90,6 @@ POCSAGAppView::POCSAGAppView(NavigationView& nav)
         logger->append(LOG_ROOT_DIR "/POCSAG.TXT");
 
     audio::output::start();
-
     baseband::set_pocsag();
 }
 
@@ -99,8 +100,9 @@ void POCSAGAppView::focus() {
 POCSAGAppView::~POCSAGAppView() {
     audio::output::stop();
 
-    // Save ignored address
+    // Save settings.
     persistent_memory::set_pocsag_ignore_address(sym_ignore.value_dec_u32());
+    enable_logging = check_log.value();
 
     receiver_model.disable();
     baseband::shutdown();

firmware/application/apps/pocsag_app.hpp

@@ -65,7 +65,14 @@ class POCSAGAppView : public View {
     NavigationView& nav_;
     RxRadioState radio_state_{};
     app_settings::SettingsManager settings_{
-        "rx_pocsag", app_settings::Mode::RX};
+        "rx_pocsag",
+        app_settings::Mode::RX};
+
+    // Settings
+    bool enable_logging = false;
+    SettingsStore settings_store_{
+        "rx_pocsag_ui",
+        {{"enable_logging", &enable_logging}}};
 
     uint32_t last_address = 0xFFFFFFFF;
     pocsag::POCSAGState pocsag_state{};

firmware/application/apps/ui_text_editor.cpp

@@ -360,6 +360,8 @@ TextEditorView::TextEditorView(NavigationView& nav)
             &text_size,
         });
 
+    viewer.set_font_zoom(enable_zoom);
+
     viewer.on_select = [this]() {
         // Treat as if menu button was pressed.
         if (button_menu.on_select)
@@ -382,7 +384,7 @@ TextEditorView::TextEditorView(NavigationView& nav)
     };
 
     menu.on_zoom() = [this]() {
-        viewer.toggle_font_zoom();
+        enable_zoom = viewer.toggle_font_zoom();
         refresh_ui();
         hide_menu(true);
     };

firmware/application/apps/ui_text_editor.hpp

@@ -32,6 +32,7 @@
 #include "ui_styles.hpp"
 #include "ui_widget.hpp"
 
+#include "app_settings.hpp"
 #include "file_wrapper.hpp"
 #include "optional.hpp"
 
@@ -80,7 +81,10 @@ class TextViewer : public Widget {
 
     const Style& style() { return *font_style; }
     void set_font_zoom(bool zoom);
-    void toggle_font_zoom() { set_font_zoom(!font_zoom); };
+    bool toggle_font_zoom() {
+        set_font_zoom(!font_zoom);
+        return font_zoom;
+    };
 
    private:
     bool font_zoom{};
@@ -220,6 +224,12 @@ class TextEditorView : public View {
     void on_show() override;
 
    private:
+    // Settings
+    bool enable_zoom = false;
+    SettingsStore settings_store_{
+        "notepad",
+        {{"enable_zoom", &enable_zoom}}};
+
     static constexpr size_t max_edit_length = 1024;
     std::string edit_line_buffer_{};
 

firmware/application/freqman_db.cpp

@@ -270,18 +270,18 @@ std::string to_freqman_string(const freqman_entry& entry) {
 
     switch (entry.type) {
         case freqman_type::Single:
-            append_field("f", to_string_dec_uint64(entry.frequency_a));
+            append_field("f", to_string_dec_uint(entry.frequency_a));
             break;
         case freqman_type::Range:
-            append_field("a", to_string_dec_uint64(entry.frequency_a));
-            append_field("b", to_string_dec_uint64(entry.frequency_b));
+            append_field("a", to_string_dec_uint(entry.frequency_a));
+            append_field("b", to_string_dec_uint(entry.frequency_b));
 
             if (is_valid(entry.step))
                 append_field("s", freqman_entry_get_step_string_short(entry.step));
             break;
         case freqman_type::HamRadio:
-            append_field("r", to_string_dec_uint64(entry.frequency_a));
-            append_field("t", to_string_dec_uint64(entry.frequency_b));
+            append_field("r", to_string_dec_uint(entry.frequency_a));
+            append_field("t", to_string_dec_uint(entry.frequency_b));
 
             if (is_valid(entry.tone))
                 append_field("c", tonekey::tone_key_value_string(entry.tone));

firmware/application/string_format.cpp

@@ -59,30 +59,37 @@ static char* to_string_dec_uint_pad_internal(
     return q;
 }
 
-template <typename Int>
-char* to_string_dec_uint_internal(Int n, StringFormatBuffer& buffer, size_t& length) {
+static char* to_string_dec_uint_internal(uint64_t n, StringFormatBuffer& buffer, size_t& length) {
     auto end = &buffer.back();
     auto start = to_string_dec_uint_internal(end, n);
     length = end - start;
     return start;
 }
 
-char* to_string_dec_uint(uint32_t n, StringFormatBuffer& buffer, size_t& length) {
+char* to_string_dec_uint(uint64_t n, StringFormatBuffer& buffer, size_t& length) {
     return to_string_dec_uint_internal(n, buffer, length);
 }
 
-char* to_string_dec_uint64(uint64_t n, StringFormatBuffer& buffer, size_t& length) {
-    return to_string_dec_uint_internal(n, buffer, length);
+char* to_string_dec_int(int64_t n, StringFormatBuffer& buffer, size_t& length) {
+    bool negative = n < 0;
+    auto start = to_string_dec_uint(negative ? -n : n, buffer, length);
+
+    if (negative) {
+        *(--start) = '-';
+        ++length;
+    }
+
+    return start;
 }
 
-std::string to_string_dec_uint(uint32_t n) {
+std::string to_string_dec_int(int64_t n) {
     StringFormatBuffer b{};
     size_t len{};
-    char* str = to_string_dec_uint(n, b, len);
+    char* str = to_string_dec_int(n, b, len);
     return std::string(str, len);
 }
 
-std::string to_string_dec_uint64(uint64_t n) {
+std::string to_string_dec_uint(uint64_t n) {
     StringFormatBuffer b{};
     size_t len{};
     char* str = to_string_dec_uint(n, b, len);
@@ -194,14 +201,14 @@ std::string to_string_rounded_freq(const uint64_t f, int8_t precision) {
     };
 
     if (precision < 1) {
-        final_str = to_string_dec_uint64(f / 1000000);
+        final_str = to_string_dec_uint(f / 1000000);
     } else {
         if (precision > 6)
             precision = 6;
 
         uint32_t divisor = pow10[6 - precision];
 
-        final_str = to_string_dec_uint64(f / 1000000) + "." + to_string_dec_int(((f + (divisor / 2)) / divisor) % pow10[precision], precision, '0');
+        final_str = to_string_dec_uint(f / 1000000) + "." + to_string_dec_int(((f + (divisor / 2)) / divisor) % pow10[precision], precision, '0');
     }
     return final_str;
 }

firmware/application/string_format.hpp

@@ -43,17 +43,17 @@ const char unit_prefix[7]{'n', 'u', 'm', 0, 'k', 'M', 'G'};
 
 using StringFormatBuffer = std::array<char, 24>;
 
-/* uint conversion without memory allocations. */
-char* to_string_dec_uint(uint32_t n, StringFormatBuffer& buffer, size_t& length);
-char* to_string_dec_uint64(uint64_t n, StringFormatBuffer& buffer, size_t& length);
+/* Integer conversion without memory allocations. */
+char* to_string_dec_int(int64_t n, StringFormatBuffer& buffer, size_t& length);
+char* to_string_dec_uint(uint64_t n, StringFormatBuffer& buffer, size_t& length);
 
-std::string to_string_dec_uint(uint32_t n);
-std::string to_string_dec_uint64(uint64_t n);
+std::string to_string_dec_int(int64_t n);
+std::string to_string_dec_uint(uint64_t n);
 
 // TODO: Allow l=0 to not fill/justify? Already using this way in ui_spectrum.hpp...
 std::string to_string_bin(const uint32_t n, const uint8_t l = 0);
 std::string to_string_dec_uint(const uint32_t n, const int32_t l, const char fill = ' ');
-std::string to_string_dec_int(const int32_t n, const int32_t l = 0, const char fill = 0);
+std::string to_string_dec_int(const int32_t n, const int32_t l, const char fill = 0);
 std::string to_string_decimal(float decimal, int8_t precision);
 
 std::string to_string_hex(const uint64_t n, const int32_t l = 0);

firmware/test/application/test_convert.cpp

@@ -99,4 +99,10 @@ TEST_CASE("It should convert 8-bit.") {
     CHECK_EQ(val, 123);
 }
 
+TEST_CASE("It should convert negative.") {
+    int8_t val = 0;
+    REQUIRE(parse_int("-64", val));
+    CHECK_EQ(val, -64);
+}
+
 TEST_SUITE_END();

firmware/test/application/test_string_format.cpp

@@ -24,12 +24,27 @@
 
 /* TODO: Tests for all string_format functions. */
 
-TEST_CASE("to_string_dec_uint64 returns correct value.") {
-    CHECK_EQ(to_string_dec_uint64(0), "0");
-    CHECK_EQ(to_string_dec_uint64(1), "1");
-    CHECK_EQ(to_string_dec_uint64(1'000'000), "1000000");
-    CHECK_EQ(to_string_dec_uint64(1'234'567'890), "1234567890");
-    CHECK_EQ(to_string_dec_uint64(1'234'567'891), "1234567891");
+TEST_CASE("to_string_dec_int returns correct value.") {
+    CHECK_EQ(to_string_dec_int(0), "0");
+    CHECK_EQ(to_string_dec_int(1), "1");
+    CHECK_EQ(to_string_dec_int(-1), "-1");
+    CHECK_EQ(to_string_dec_int(1'000'000), "1000000");
+    CHECK_EQ(to_string_dec_int(-1'000'000), "-1000000");
+    CHECK_EQ(to_string_dec_int(1'234'567'890), "1234567890");
+    CHECK_EQ(to_string_dec_int(-1'234'567'890), "-1234567890");
+    CHECK_EQ(to_string_dec_int(1'234'567'891), "1234567891");
+    CHECK_EQ(to_string_dec_int(-1'234'567'891), "-1234567891");
+    CHECK_EQ(to_string_dec_int(9'876'543'210), "9876543210");
+    CHECK_EQ(to_string_dec_int(-9'876'543'210), "-9876543210");
+}
+
+TEST_CASE("to_string_dec_uint returns correct value.") {
+    CHECK_EQ(to_string_dec_uint(0), "0");
+    CHECK_EQ(to_string_dec_uint(1), "1");
+    CHECK_EQ(to_string_dec_uint(1'000'000), "1000000");
+    CHECK_EQ(to_string_dec_uint(1'234'567'890), "1234567890");
+    CHECK_EQ(to_string_dec_uint(1'234'567'891), "1234567891");
+    CHECK_EQ(to_string_dec_uint(9'876'543'210), "9876543210");
 }
 
 TEST_CASE("to_string_freq returns correct value.") {