Initial commit

- Basic main window
- Are you sure you want to exit modal
- Basic settings window

.gitignore

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+*.o
+*.obj
+logmeow
+logmeow.exe

.gitmodules

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+[submodule "imgui"]
+	path = imgui
+	url = https://github.com/ocornut/imgui.git

Makefile

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+#
+# Cross Platform Makefile
+# Compatible with MSYS2/MINGW, Ubuntu 14.04.1 and Mac OS X
+#
+# You will need SDL2 (http://www.libsdl.org):
+# Linux:
+#   apt-get install libsdl2-dev
+# Mac OS X:
+#   brew install sdl2
+# MSYS2:
+#   pacman -S mingw-w64-i686-SDL2
+#
+
+#CXX = g++
+#CXX = clang++
+
+EXE = logmeow
+IMGUI_DIR = imgui
+SOURCES = main.cpp config.cpp event_loop.cpp
+SOURCES += $(IMGUI_DIR)/imgui.cpp $(IMGUI_DIR)/imgui_demo.cpp $(IMGUI_DIR)/imgui_draw.cpp $(IMGUI_DIR)/imgui_tables.cpp $(IMGUI_DIR)/imgui_widgets.cpp
+SOURCES += $(IMGUI_DIR)/misc/cpp/imgui_stdlib.cpp $(IMGUI_DIR)/backends/imgui_impl_sdl.cpp $(IMGUI_DIR)/backends/imgui_impl_opengl3.cpp
+OBJS = $(addsuffix .o, $(basename $(notdir $(SOURCES))))
+UNAME_S := $(shell uname -s)
+LINUX_GL_LIBS = -lGL
+
+CXXFLAGS = -std=c++11 -I$(IMGUI_DIR) -I$(IMGUI_DIR)/misc/cpp -I$(IMGUI_DIR)/backends
+CXXFLAGS += -g -Wall -Wformat
+LIBS =
+
+##---------------------------------------------------------------------
+## OPENGL ES
+##---------------------------------------------------------------------
+
+## This assumes a GL ES library available in the system, e.g. libGLESv2.so
+# CXXFLAGS += -DIMGUI_IMPL_OPENGL_ES2
+# LINUX_GL_LIBS = -lGLESv2
+## If you're on a Raspberry Pi and want to use the legacy drivers,
+## use the following instead:
+# LINUX_GL_LIBS = -L/opt/vc/lib -lbrcmGLESv2
+
+##---------------------------------------------------------------------
+## BUILD FLAGS PER PLATFORM
+##---------------------------------------------------------------------
+
+ifeq ($(UNAME_S), Linux) #LINUX
+	ECHO_MESSAGE = "Linux"
+	LIBS += $(LINUX_GL_LIBS) -ldl `sdl2-config --libs`
+
+	CXXFLAGS += `sdl2-config --cflags`
+	CFLAGS = $(CXXFLAGS)
+endif
+
+ifeq ($(UNAME_S), Darwin) #APPLE
+	ECHO_MESSAGE = "Mac OS X"
+	LIBS += -framework OpenGL -framework Cocoa -framework IOKit -framework CoreVideo `sdl2-config --libs`
+	LIBS += -L/usr/local/lib -L/opt/local/lib
+
+	CXXFLAGS += `sdl2-config --cflags`
+	CXXFLAGS += -I/usr/local/include -I/opt/local/include
+	CFLAGS = $(CXXFLAGS)
+endif
+
+ifeq ($(OS), Windows_NT)
+	ECHO_MESSAGE = "MinGW"
+	LIBS += -lgdi32 -lopengl32 -limm32 `pkg-config --static --libs sdl2`
+
+	CXXFLAGS += `pkg-config --cflags sdl2`
+	CFLAGS = $(CXXFLAGS)
+endif
+
+##---------------------------------------------------------------------
+## BUILD RULES
+##---------------------------------------------------------------------
+
+%.o:%.cpp
+	$(CXX) $(CXXFLAGS) -c -o $@ $<
+
+%.o:$(IMGUI_DIR)/%.cpp
+	$(CXX) $(CXXFLAGS) -c -o $@ $<
+
+%.o:$(IMGUI_DIR)/misc/cpp/%.cpp
+	$(CXX) $(CXXFLAGS) -c -o $@ $<
+
+%.o:$(IMGUI_DIR)/backends/%.cpp
+	$(CXX) $(CXXFLAGS) -c -o $@ $<
+
+$(EXE): $(OBJS)
+	$(CXX) -o $@ $^ $(CXXFLAGS) $(LIBS)
+
+clean:
+	rm -f $(EXE) $(OBJS)

config.cpp

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+#include <cstdio>
+#include <cstdlib>
+#include <cstring>
+#include <string>
+#include <fstream>
+
+#include "config.h"
+
+std::string get_config_path() {
+    const char* path;
+
+    path = getenv("XDG_CONFIG_HOME");
+    if (path) {
+        return std::string(path) + "/logmeow/config";
+    }
+    path = getenv("HOME");
+    if (path) {
+        return std::string(path) + "/.config/logmeow/config";
+    }
+
+    throw std::runtime_error("cannot find suitable config folder, please set XDG_CONFIG_HOME or HOME");
+}
+
+Config parse_config(FILE* file) {
+    size_t line_capacity_size = 128 * sizeof(char);
+    char* line = static_cast<char*>(malloc(line_capacity_size));
+    if (line == nullptr) {
+        throw std::bad_alloc();
+    }
+    Config config;
+
+    while (true) {
+        errno = 0;
+        if (getline(&line, &line_capacity_size, file) < 0) {
+            int errsv = errno;
+            free(line);
+            if (errsv == ENOMEM) {
+                throw std::bad_alloc();
+            } else if (errsv != 0) {
+                throw std::system_error(errsv, std::generic_category(), "getline()");
+            } else {
+                break;
+            }
+        }
+        if (line_capacity_size == 0 || line[0] == '\0' || line[0] == '#') {
+            continue;
+        }
+        if (char* newline = strchr(line, '\n')) {
+            *newline = '\0';
+        }
+
+        if (strncmp(line, "logcat_command=", 15 * sizeof(char)) == 0) {
+            config.logcat_command = &line[16];
+        } else {
+            std::invalid_argument e = std::invalid_argument(std::string("unknown config line: ") + line);
+            free(line);
+            throw e;
+        }
+    }
+
+    return config;
+}
+
+void write_config(std::ofstream& file, const Config& config) {
+    file << "# This is an auto-generated file, comments made will be lost\n"
+         << "# This is a poor man's config file \"format\", there are only three legal lines:\n"
+         << "#     # a comment, only available at the start of a line\n"
+         << "#     (an empty line, no whitespace)\n"
+         << "#     key=value pairs, no spaces around the delimiter, and no unknown keys\n\n"
+         << "logcat_command=" << config.logcat_command;
+}

config.h

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+#pragma once
+
+#include <string>
+#include <fstream>
+
+struct Config {
+    std::string logcat_command;
+};
+
+std::string get_config_path();
+Config parse_config(FILE* file);
+void write_config(std::ofstream& file, const Config& config);

event_loop.cpp

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+#include <imgui.h>
+#include <imgui_stdlib.h>
+
+#include "config.h"
+
+static inline void settings_window(Config& inactive_config, bool* show_settings_window) {
+    // by default, the settings window is a bit cramped
+    ImGui::SetNextWindowSize(ImVec2(575, 75), ImGuiCond_FirstUseEver);
+    if (!ImGui::Begin("Settings", show_settings_window)) {
+        ImGui::End();
+        return;
+    }
+    ImGui::Text("Persistence coming soon(tm)");
+    ImGui::InputTextWithHint("Logcat command", "adb logcat -Dv 'threadtime UTC epoch usec'", &inactive_config.logcat_command);
+    ImGui::End();
+}
+
+static inline void main_window(Config& active_config, Config& inactive_config, bool* show_demo_window,
+        bool* show_settings_window, bool* save_settings_when_settings_window_closed, bool* exit_requested_rev) {
+    if (!ImGui::Begin("LogMeow", exit_requested_rev)) {
+        ImGui::End();
+        return;
+    }
+    ImGui::Checkbox("Show Dear ImGui Demo Window", show_demo_window);
+    if (ImGui::Button("Settings")) {
+        if (!*show_settings_window) {
+            inactive_config = active_config;
+        }
+        *show_settings_window = true;
+        *save_settings_when_settings_window_closed = true;
+    }
+    ImGui::Text("Application average %.3f ms/frame (%.1f FPS)", 1000.0f / ImGui::GetIO().Framerate, ImGui::GetIO().Framerate);
+    ImGui::End();
+}
+
+static inline void exit_modal_if_necessary(bool* run_event_loop) {
+    if (ImGui::BeginPopupModal("Exit?", nullptr, ImGuiWindowFlags_NoResize)) {
+        ImGui::Text("Are you sure you want to exit?");
+
+        if (ImGui::Button("Yes", ImVec2(120, 0))) {
+            *run_event_loop = false;
+        }
+        ImGui::SameLine();
+        if (ImGui::Button("No", ImVec2(120, 0))) {
+            ImGui::CloseCurrentPopup();
+        }
+        ImGui::SetItemDefaultFocus();
+        ImGui::EndPopup();
+    }
+}
+
+void event_loop(Config& active_config, bool* run_event_loop) {
+    static bool show_demo_window = false;
+    static bool show_settings_window = false;
+    static bool save_settings_when_settings_window_closed = false;
+    static bool exit_requested_rev = true;
+    static Config inactive_config;
+
+    if (show_demo_window) {
+        ImGui::ShowDemoWindow(&show_demo_window);
+    }
+
+    if (show_settings_window) {
+        settings_window(inactive_config, &show_settings_window);
+    } else if (save_settings_when_settings_window_closed) {
+        active_config = inactive_config;
+    }
+
+    if (!exit_requested_rev) {
+        ImGui::OpenPopup("Exit?");
+        exit_requested_rev = true;
+    }
+    exit_modal_if_necessary(run_event_loop);
+    main_window(active_config, inactive_config, &show_demo_window, &show_settings_window, &save_settings_when_settings_window_closed, &exit_requested_rev);
+}

event_loop.h

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+#pragma once
+
+#include "config.h"
+
+void event_loop(Config& config, bool* run_event_loop);

imgui

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+Subproject commit e57871bb95faec757e51214bc0e1ae29b13258ab

imgui.ini

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+[Window][Debug##Default]
+Pos=60,60
+Size=400,400
+Collapsed=0
+
+[Window][LogMeow]
+Pos=60,60
+Size=339,94
+Collapsed=0
+
+[Window][Exit?]
+Pos=549,324
+Size=264,71
+Collapsed=0
+
+[Window][Settings]
+Pos=88,228
+Size=575,75
+Collapsed=0
+

main.cpp

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+#include <cstdio>
+#include <sys/stat.h>
+
+#include <imgui.h>
+#include <imgui_impl_sdl.h>
+#include <imgui_impl_opengl3.h>
+#include <SDL.h>
+#if defined(IMGUI_IMPL_OPENGL_ES2)
+#include <SDL_opengles2.h>
+#else
+#include <SDL_opengl.h>
+#endif
+
+#include "config.h"
+#include "event_loop.h"
+
+int main(int, char**)
+{
+    Config config;
+    FILE* config_file = nullptr;
+    try {
+        config_file = fopen(get_config_path().c_str(), "r");
+        if (config_file) {
+            config = parse_config(config_file);
+        } else if (errno != ENOENT) {
+            perror("Failed to open config file");
+            return 1;
+        }
+    } catch (const std::exception& e) {
+        fprintf(stderr, "Failed to parse config: %s\n", e.what());
+        return 1;
+    }
+    if (config_file) {
+        if (fclose(config_file)) {
+            perror("Failed to close config file");
+        }
+    }
+
+    // Setup SDL
+    // (Some versions of SDL before <2.0.10 appears to have performance/stalling issues on a minority of Windows systems,
+    // depending on whether SDL_INIT_GAMECONTROLLER is enabled or disabled.. updating to the latest version of SDL is recommended!)
+    if (SDL_Init(SDL_INIT_VIDEO | SDL_INIT_TIMER | SDL_INIT_GAMECONTROLLER) != 0)
+    {
+        printf("Error: %s\n", SDL_GetError());
+        return -1;
+    }
+
+    // Decide GL+GLSL versions
+#if defined(IMGUI_IMPL_OPENGL_ES2)
+    // GL ES 2.0 + GLSL 100
+    const char* glsl_version = "#version 100";
+    SDL_GL_SetAttribute(SDL_GL_CONTEXT_FLAGS, 0);
+    SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_ES);
+    SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 2);
+    SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 0);
+#elif defined(__APPLE__)
+    // GL 3.2 Core + GLSL 150
+    const char* glsl_version = "#version 150";
+    SDL_GL_SetAttribute(SDL_GL_CONTEXT_FLAGS, SDL_GL_CONTEXT_FORWARD_COMPATIBLE_FLAG); // Always required on Mac
+    SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_CORE);
+    SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 3);
+    SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 2);
+#else
+    // GL 3.0 + GLSL 130
+    const char* glsl_version = "#version 130";
+    SDL_GL_SetAttribute(SDL_GL_CONTEXT_FLAGS, 0);
+    SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_CORE);
+    SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 3);
+    SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 0);
+#endif
+
+    // Create window with graphics context
+    SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
+    SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, 24);
+    SDL_GL_SetAttribute(SDL_GL_STENCIL_SIZE, 8);
+    SDL_WindowFlags window_flags = (SDL_WindowFlags)(SDL_WINDOW_OPENGL | SDL_WINDOW_RESIZABLE | SDL_WINDOW_ALLOW_HIGHDPI);
+    SDL_Window* window = SDL_CreateWindow("LogMeow", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 1280, 720, window_flags);
+    SDL_GLContext gl_context = SDL_GL_CreateContext(window);
+    SDL_GL_MakeCurrent(window, gl_context);
+    SDL_GL_SetSwapInterval(1); // Enable vsync
+
+    // Setup Dear ImGui context
+    IMGUI_CHECKVERSION();
+    ImGui::CreateContext();
+    ImGuiIO& io = ImGui::GetIO(); (void)io;
+    io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard;       // Enable Keyboard Controls
+    //io.ConfigFlags |= ImGuiConfigFlags_NavEnableGamepad;      // Enable Gamepad Controls
+
+    // Setup Dear ImGui style
+    ImGui::StyleColorsDark();
+    //ImGui::StyleColorsLight();
+
+    // Setup Platform/Renderer backends
+    ImGui_ImplSDL2_InitForOpenGL(window, gl_context);
+    ImGui_ImplOpenGL3_Init(glsl_version);
+
+    // Load Fonts
+    // - If no fonts are loaded, dear imgui will use the default font. You can also load multiple fonts and use ImGui::PushFont()/PopFont() to select them.
+    // - AddFontFromFileTTF() will return the ImFont* so you can store it if you need to select the font among multiple.
+    // - If the file cannot be loaded, the function will return NULL. Please handle those errors in your application (e.g. use an assertion, or display an error and quit).
+    // - The fonts will be rasterized at a given size (w/ oversampling) and stored into a texture when calling ImFontAtlas::Build()/GetTexDataAsXXXX(), which ImGui_ImplXXXX_NewFrame below will call.
+    // - Use '#define IMGUI_ENABLE_FREETYPE' in your imconfig file to use Freetype for higher quality font rendering.
+    // - Read 'docs/FONTS.md' for more instructions and details.
+    // - Remember that in C/C++ if you want to include a backslash \ in a string literal you need to write a double backslash \\ !
+    //io.Fonts->AddFontDefault();
+    //io.Fonts->AddFontFromFileTTF("c:\\Windows\\Fonts\\segoeui.ttf", 18.0f);
+    //io.Fonts->AddFontFromFileTTF("../../misc/fonts/DroidSans.ttf", 16.0f);
+    //io.Fonts->AddFontFromFileTTF("../../misc/fonts/Roboto-Medium.ttf", 16.0f);
+    //io.Fonts->AddFontFromFileTTF("../../misc/fonts/Cousine-Regular.ttf", 15.0f);
+    //ImFont* font = io.Fonts->AddFontFromFileTTF("c:\\Windows\\Fonts\\ArialUni.ttf", 18.0f, NULL, io.Fonts->GetGlyphRangesJapanese());
+    //IM_ASSERT(font != NULL);
+
+    // Main loop
+    bool run_event_loop = true;
+    while (run_event_loop)
+    {
+        // Poll and handle events (inputs, window resize, etc.)
+        // You can read the io.WantCaptureMouse, io.WantCaptureKeyboard flags to tell if dear imgui wants to use your inputs.
+        // - When io.WantCaptureMouse is true, do not dispatch mouse input data to your main application, or clear/overwrite your copy of the mouse data.
+        // - When io.WantCaptureKeyboard is true, do not dispatch keyboard input data to your main application, or clear/overwrite your copy of the keyboard data.
+        // Generally you may always pass all inputs to dear imgui, and hide them from your application based on those two flags.
+        SDL_Event event;
+        while (SDL_PollEvent(&event))
+        {
+            ImGui_ImplSDL2_ProcessEvent(&event);
+            if (event.type == SDL_QUIT) {
+                run_event_loop = false;
+            } else if (event.type == SDL_WINDOWEVENT && event.window.event == SDL_WINDOWEVENT_CLOSE && event.window.windowID == SDL_GetWindowID(window))
+                run_event_loop = false;
+        }
+
+        // Start the Dear ImGui frame
+        ImGui_ImplOpenGL3_NewFrame();
+        ImGui_ImplSDL2_NewFrame();
+        ImGui::NewFrame();
+
+        event_loop(config, &run_event_loop);
+
+        // Rendering
+        ImGui::Render();
+        glViewport(0, 0, (int)io.DisplaySize.x, (int)io.DisplaySize.y);
+        glClearColor(0.15f, 0.15f, 0.15f, 1.0f);
+        glClear(GL_COLOR_BUFFER_BIT);
+        ImGui_ImplOpenGL3_RenderDrawData(ImGui::GetDrawData());
+        SDL_GL_SwapWindow(window);
+    }
+
+    // Cleanup
+    ImGui_ImplOpenGL3_Shutdown();
+    ImGui_ImplSDL2_Shutdown();
+    ImGui::DestroyContext();
+
+    SDL_GL_DeleteContext(gl_context);
+    SDL_DestroyWindow(window);
+    SDL_Quit();
+
+    return 0;
+}