Start working on a graphical Terminal program.

4 files changed, 597 insertions, 0 deletions

diff --git a/Terminal/Makefile b/Terminal/Makefile
new file mode 100644
index 0000000000..40e66f47fe
--- /dev/null
+++ b/Terminal/Makefile
@@ -0,0 +1,33 @@
+OBJS = \
+    Terminal.o \
+    main.o
+
+APP = Terminal
+
+ARCH_FLAGS =
+STANDARD_FLAGS = -std=c++17 -nostdinc++ -nostdlib -nostdinc
+USERLAND_FLAGS = -ffreestanding -fno-stack-protector -fno-ident
+WARNING_FLAGS = -Wextra -Wall -Wundef -Wcast-qual -Wwrite-strings
+FLAVOR_FLAGS = -march=i386 -mregparm=3 -m32 -fno-exceptions -fno-rtti -fmerge-all-constants -fno-unroll-loops -fno-pie -fno-pic
+OPTIMIZATION_FLAGS = -Oz -fno-asynchronous-unwind-tables
+INCLUDE_FLAGS = -I.. -I. -I../LibC
+
+DEFINES = -DSERENITY -DSANITIZE_PTRS -DUSERLAND
+
+CXXFLAGS = $(WARNING_FLAGS) $(OPTIMIZATION_FLAGS) $(USERLAND_FLAGS) $(FLAVOR_FLAGS) $(ARCH_FLAGS) $(STANDARD_FLAGS) $(INCLUDE_FLAGS) $(DEFINES)
+CXX = clang
+LD = ld
+AR = ar
+LDFLAGS = -static --strip-debug -melf_i386 --build-id=none -z norelro -z now -e _start --gc-sections
+
+all: $(APP)
+
+$(APP): $(OBJS)
+	$(LD) -o $(APP) $(LDFLAGS) $(OBJS) ../LibC/LibC.a
+
+.cpp.o:
+	@echo "CXX $<"; $(CXX) $(CXXFLAGS) -o $@ -c $<
+
+clean:
+	@echo "CLEAN"; rm -f $(APPS) $(OBJS)
+
diff --git a/Terminal/Terminal.cpp b/Terminal/Terminal.cpp
new file mode 100644
index 0000000000..2aebda19f7
--- /dev/null
+++ b/Terminal/Terminal.cpp
@@ -0,0 +1,446 @@
+#include "Terminal.h"
+#include <AK/AKString.h>
+#include <Widgets/Font.h>
+#include <Widgets/Painter.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <gui.h>
+
+void Terminal::create_window()
+{
+    auto& font = Font::defaultFont();
+
+    m_pixel_width = m_columns * font.glyphWidth();
+    m_pixel_height = m_rows * font.glyphHeight();
+
+    GUI_CreateWindowParameters params;
+    params.rect = { { 300, 300 }, { m_pixel_width, m_pixel_height } };
+    params.background_color = 0x000000;
+    strcpy(params.title, "Terminal");
+    m_window_id = gui_create_window(&params);
+    ASSERT(m_window_id > 0);
+    if (m_window_id < 0) {
+        perror("gui_create_window");
+        exit(1);
+    }
+
+    GUI_WindowBackingStoreInfo info;
+    int rc = gui_get_window_backing_store(m_window_id, &info);
+    if (rc < 0) {
+        perror("gui_get_window_backing_store");
+        exit(1);
+    }
+
+    m_backing = GraphicsBitmap::create_wrapper(info.size, info.pixels);
+    dbgprintf("(Terminal:%d) window backing %ux%u @ %p\n", getpid(), info.size.width, info.size.height, info.pixels);
+
+}
+
+Terminal::Terminal()
+{
+    set_size(80, 25);
+    m_horizontal_tabs = static_cast<byte*>(malloc(columns()));
+    for (unsigned i = 0; i < columns(); ++i)
+        m_horizontal_tabs[i] = (i % 8) == 0;
+    // Rightmost column is always last tab on line.
+    m_horizontal_tabs[columns() - 1] = 1;
+
+    m_buffer = (byte*)malloc(rows() * columns() * 2);
+    word* line_mem = reinterpret_cast<word*>(m_buffer);
+    for (word i = 0; i < rows() * columns(); ++i)
+        line_mem[i] = 0x0720;
+
+    inject_string_at(2, 2, "I am text inside the Terminal buffer.");
+}
+
+void Terminal::inject_string_at(word row, word column, const String& string)
+{
+    for (size_t i = 0; i < string.length(); ++i) {
+        put_character_at(row, column + i, string[i]);
+    }
+}
+
+Terminal::~Terminal()
+{
+    kfree(m_horizontal_tabs);
+    m_horizontal_tabs = nullptr;
+}
+
+void Terminal::clear()
+{
+    word* linemem = (word*)m_buffer;
+    for (word i = 0; i < rows() * columns(); ++i)
+        linemem[i] = 0x0720;
+    set_cursor(0, 0);
+}
+
+inline bool is_valid_parameter_character(byte ch)
+{
+    return ch >= 0x30 && ch <= 0x3f;
+}
+
+inline bool is_valid_intermediate_character(byte ch)
+{
+    return ch >= 0x20 && ch <= 0x2f;
+}
+
+inline bool is_valid_final_character(byte ch)
+{
+    return ch >= 0x40 && ch <= 0x7e;
+}
+
+unsigned parseUInt(const String& str, bool& ok)
+{
+    unsigned value = 0;
+    for (size_t i = 0; i < str.length(); ++i) {
+        if (str[i] < '0' || str[i] > '9') {
+            ok = false;
+            return 0;
+        }
+        value = value * 10;
+        value += str[i] - '0';
+    }
+    ok = true;
+    return value;
+}
+
+enum class VGAColor : byte {
+    Black = 0,
+    Blue,
+    Green,
+    Cyan,
+    Red,
+    Magenta,
+    Brown,
+    LightGray,
+    DarkGray,
+    BrightBlue,
+    BrightGreen,
+    BrightCyan,
+    BrightRed,
+    BrightMagenta,
+    Yellow,
+    White,
+};
+
+enum class ANSIColor : byte {
+    Black = 0,
+    Red,
+    Green,
+    Brown,
+    Blue,
+    Magenta,
+    Cyan,
+    LightGray,
+    DarkGray,
+    BrightRed,
+    BrightGreen,
+    Yellow,
+    BrightBlue,
+    BrightMagenta,
+    BrightCyan,
+    White,
+};
+
+static inline VGAColor ansi_color_to_vga(ANSIColor color)
+{
+    switch (color) {
+    case ANSIColor::Black: return VGAColor::Black;
+    case ANSIColor::Red: return VGAColor::Red;
+    case ANSIColor::Brown: return VGAColor::Brown;
+    case ANSIColor::Blue: return VGAColor::Blue;
+    case ANSIColor::Magenta: return VGAColor::Magenta;
+    case ANSIColor::Green: return VGAColor::Green;
+    case ANSIColor::Cyan: return VGAColor::Cyan;
+    case ANSIColor::LightGray: return VGAColor::LightGray;
+    case ANSIColor::DarkGray: return VGAColor::DarkGray;
+    case ANSIColor::BrightRed: return VGAColor::BrightRed;
+    case ANSIColor::BrightGreen: return VGAColor::BrightGreen;
+    case ANSIColor::Yellow: return VGAColor::Yellow;
+    case ANSIColor::BrightBlue: return VGAColor::BrightBlue;
+    case ANSIColor::BrightMagenta: return VGAColor::BrightMagenta;
+    case ANSIColor::BrightCyan: return VGAColor::BrightCyan;
+    case ANSIColor::White: return VGAColor::White;
+    }
+    ASSERT_NOT_REACHED();
+    return VGAColor::LightGray;
+}
+
+static inline byte ansi_color_to_vga(byte color)
+{
+    return (byte)ansi_color_to_vga((ANSIColor)color);
+}
+
+void Terminal::escape$m(const Vector<unsigned>& params)
+{
+    for (auto param : params) {
+        switch (param) {
+        case 0:
+            // Reset
+            m_current_attribute = 0x07;
+            break;
+        case 1:
+            // Bold
+            m_current_attribute |= 8;
+            break;
+        case 30:
+        case 31:
+        case 32:
+        case 33:
+        case 34:
+        case 35:
+        case 36:
+        case 37:
+            // Foreground color
+            m_current_attribute &= ~0x7;
+            m_current_attribute |= ansi_color_to_vga(param - 30);
+            break;
+        case 40:
+        case 41:
+        case 42:
+        case 43:
+        case 44:
+        case 45:
+        case 46:
+        case 47:
+            // Background color
+            m_current_attribute &= ~0x70;
+            m_current_attribute |= ansi_color_to_vga(param - 30) << 8;
+            break;
+        }
+    }
+}
+
+void Terminal::escape$s(const Vector<unsigned>&)
+{
+    m_saved_cursor_row = m_cursor_row;
+    m_saved_cursor_column = m_cursor_column;
+}
+
+void Terminal::escape$u(const Vector<unsigned>&)
+{
+    set_cursor(m_saved_cursor_row, m_saved_cursor_column);
+}
+
+void Terminal::escape$H(const Vector<unsigned>& params)
+{
+    unsigned row = 1;
+    unsigned col = 1;
+    if (params.size() >= 1)
+        row = params[0];
+    if (params.size() >= 2)
+        col = params[1];
+    set_cursor(row - 1, col - 1);
+}
+
+void Terminal::escape$A(const Vector<unsigned>& params)
+{
+    int num = 1;
+    if (params.size() >= 1)
+        num = params[0];
+    int new_row = (int)m_cursor_row - num;
+    if (new_row < 0)
+        new_row = 0;
+    set_cursor(new_row, m_cursor_column);
+}
+
+void Terminal::escape$D(const Vector<unsigned>& params)
+{
+    int num = 1;
+    if (params.size() >= 1)
+        num = params[0];
+    int new_column = (int)m_cursor_column - num;
+    if (new_column < 0)
+        new_column = 0;
+    set_cursor(m_cursor_row, new_column);
+}
+
+void Terminal::escape$J(const Vector<unsigned>& params)
+{
+    int mode = 0;
+    if (params.size() >= 1)
+        mode = params[0];
+    switch (mode) {
+    case 0:
+        // FIXME: Clear from cursor to end of screen.
+        notImplemented();
+        break;
+    case 1:
+        // FIXME: Clear from cursor to beginning of screen.
+        notImplemented();
+        break;
+    case 2:
+        clear();
+        break;
+    case 3:
+        // FIXME: <esc>[3J should also clear the scrollback buffer.
+        clear();
+        break;
+    }
+}
+
+void Terminal::execute_escape_sequence(byte final)
+{
+    auto paramparts = String((const char*)m_parameters.data(), m_parameters.size()).split(';');
+    Vector<unsigned> params;
+    for (auto& parampart : paramparts) {
+        bool ok;
+        unsigned value = parseUInt(parampart, ok);
+        if (!ok) {
+            // FIXME: Should we do something else?
+            return;
+        }
+        params.append(value);
+    }
+    switch (final) {
+    case 'A': escape$A(params); break;
+    case 'D': escape$D(params); break;
+    case 'H': escape$H(params); break;
+    case 'J': escape$J(params); break;
+    case 'm': escape$m(params); break;
+    case 's': escape$s(params); break;
+    case 'u': escape$u(params); break;
+    default: break;
+    }
+
+    m_parameters.clear();
+    m_intermediates.clear();
+}
+
+void Terminal::scroll_up()
+{
+    if (m_cursor_row == (rows() - 1)) {
+        memcpy(m_buffer, m_buffer + 160, 160 * 24);
+        word* linemem = (word*)&m_buffer[24 * 160];
+        for (word i = 0; i < columns(); ++i)
+            linemem[i] = 0x0720;
+    } else {
+        ++m_cursor_row;
+    }
+    m_cursor_column = 0;
+}
+
+void Terminal::set_cursor(unsigned row, unsigned column)
+{
+    ASSERT(row < rows());
+    ASSERT(column < columns());
+    m_cursor_row = row;
+    m_cursor_column = column;
+}
+
+void Terminal::put_character_at(unsigned row, unsigned column, byte ch)
+{
+    ASSERT(row < rows());
+    ASSERT(column < columns());
+    word cur = (row * 160) + (column * 2);
+    m_buffer[cur] = ch;
+    m_buffer[cur + 1] = m_current_attribute;
+}
+
+void Terminal::on_char(byte ch)
+{
+    switch (m_escape_state) {
+    case ExpectBracket:
+        if (ch == '[')
+            m_escape_state = ExpectParameter;
+        else
+            m_escape_state = Normal;
+        return;
+    case ExpectParameter:
+        if (is_valid_parameter_character(ch)) {
+            m_parameters.append(ch);
+            return;
+        }
+        m_escape_state = ExpectIntermediate;
+        // fall through
+    case ExpectIntermediate:
+        if (is_valid_intermediate_character(ch)) {
+            m_intermediates.append(ch);
+            return;
+        }
+        m_escape_state = ExpectFinal;
+        // fall through
+    case ExpectFinal:
+        if (is_valid_final_character(ch)) {
+            m_escape_state = Normal;
+            execute_escape_sequence(ch);
+            return;
+        }
+        m_escape_state = Normal;
+        return;
+    case Normal:
+        break;
+    }
+
+    switch (ch) {
+    case '\0':
+        return;
+    case '\033':
+        m_escape_state = ExpectBracket;
+        return;
+    case 8: // Backspace
+        if (m_cursor_column) {
+            set_cursor(m_cursor_row, m_cursor_column - 1);
+            put_character_at(m_cursor_row, m_cursor_column, ' ');
+            return;
+        }
+        break;
+    case '\a':
+        // FIXME: Bell!
+        return;
+    case '\t': {
+        for (unsigned i = m_cursor_column; i < columns(); ++i) {
+            if (m_horizontal_tabs[i]) {
+                set_cursor(m_cursor_row, i);
+                return;
+            }
+        }
+        return;
+    }
+    case '\n':
+        scroll_up();
+        set_cursor(m_cursor_row, m_cursor_column);
+        return;
+    }
+
+    put_character_at(m_cursor_row, m_cursor_column, ch);
+
+    ++m_cursor_column;
+    if (m_cursor_column >= columns())
+        scroll_up();
+    set_cursor(m_cursor_row, m_cursor_column);
+}
+
+void Terminal::set_size(word columns, word rows)
+{
+    m_columns = columns;
+    m_rows = rows;
+}
+
+void Terminal::paint()
+{
+    Rect rect { 0, 0, m_pixel_width, m_pixel_height };
+    Font& font = Font::defaultFont();
+    Painter painter(*m_backing);
+    painter.fill_rect(rect, Color::Black);
+
+    char buf[2] = { 0, 0 };
+    for (unsigned row = 0; row < m_rows; ++row) {
+        int y = row * font.glyphHeight();
+        for (unsigned column = 0; column < m_columns; ++column) {
+            int x = column * font.glyphWidth();
+            //buf[0] = at(row, column).character;
+            buf[0] = m_buffer[(row * 160) + (column * 2)];
+            painter.draw_text({ x + 2, y + 2, font.glyphWidth(), font.glyphHeight() }, buf, Painter::TextAlignment::TopLeft, Color(0xa0, 0xa0, 0xa0));
+        }
+    }
+
+    if (m_belling)
+        painter.draw_rect(rect, Color::Red);
+
+    int rc = gui_invalidate_window(m_window_id);
+    if (rc < 0) {
+        perror("gui_invalidate_window");
+        exit(1);
+    }
+}
diff --git a/Terminal/Terminal.h b/Terminal/Terminal.h
new file mode 100644
index 0000000000..8f4ef4aa4b
--- /dev/null
+++ b/Terminal/Terminal.h
@@ -0,0 +1,70 @@
+#pragma once
+
+#include <AK/AKString.h>
+#include <AK/Types.h>
+#include <AK/Vector.h>
+#include <Widgets/GraphicsBitmap.h>
+
+
+class Terminal {
+public:
+    Terminal();
+    ~Terminal();
+
+    void create_window();
+    void paint();
+    void on_char(byte);
+
+private:
+    void scroll_up();
+    void set_cursor(unsigned row, unsigned column);
+    void put_character_at(unsigned row, unsigned column, byte ch);
+
+    void escape$A(const Vector<unsigned>&);
+    void escape$D(const Vector<unsigned>&);
+    void escape$H(const Vector<unsigned>&);
+    void escape$J(const Vector<unsigned>&);
+    void escape$m(const Vector<unsigned>&);
+    void escape$s(const Vector<unsigned>&);
+    void escape$u(const Vector<unsigned>&);
+
+    void clear();
+
+    void set_size(word columns, word rows);
+    word columns() const { return m_columns; }
+    word rows() const { return m_rows; }
+
+    void inject_string_at(word row, word column, const String&);
+
+    byte* m_buffer { nullptr };
+
+    word m_columns { 0 };
+    word m_rows { 0 };
+
+    byte m_cursor_row { 0 };
+    byte m_cursor_column { 0 };
+    byte m_saved_cursor_row { 0 };
+    byte m_saved_cursor_column { 0 };
+    byte m_current_attribute { 0x07 };
+
+    void execute_escape_sequence(byte final);
+
+    enum EscapeState {
+        Normal,
+        ExpectBracket,
+        ExpectParameter,
+        ExpectIntermediate,
+        ExpectFinal,
+    };
+    EscapeState m_escape_state { Normal };
+    Vector<byte> m_parameters;
+    Vector<byte> m_intermediates;
+    byte* m_horizontal_tabs { nullptr };
+    bool m_belling { false };
+
+    int m_window_id { 0 };
+    RetainPtr<GraphicsBitmap> m_backing;
+
+    int m_pixel_width { 0 };
+    int m_pixel_height { 0 };
+};
diff --git a/Terminal/main.cpp b/Terminal/main.cpp
new file mode 100644
index 0000000000..ed769205ba
--- /dev/null
+++ b/Terminal/main.cpp
@@ -0,0 +1,48 @@
+#include <stdio.h>
+#include <unistd.h>
+#include <errno.h>
+#include <string.h>
+#include <stdlib.h>
+#include <fcntl.h>
+#include <assert.h>
+#include <Widgets/Font.h>
+#include <Widgets/GraphicsBitmap.h>
+#include <Widgets/Painter.h>
+#include <gui.h>
+#include "Terminal.h"
+
+static void paint(GraphicsBitmap& bitmap, int width, int height);
+
+int main(int argc, char** argv)
+{
+    int fd = open("/dev/gui_events", O_RDONLY);
+    if (fd < 0) {
+        perror("open");
+        return 1;
+    }
+
+    Terminal terminal;
+    terminal.create_window();
+    terminal.paint();
+
+    for (;;) {
+        GUI_Event event;
+        ssize_t nread = read(fd, &event, sizeof(event));
+        if (nread < 0) {
+            perror("read");
+            return 1;
+        }
+        assert(nread == sizeof(event));
+        dbgprintf("(Terminal:%d) ", getpid());
+        switch (event.type) {
+        case GUI_Event::Type::Paint: dbgprintf("WID=%x Paint [%d,%d %dx%d]\n", event.window_id, event.paint.rect.location.x, event.paint.rect.location.y, event.paint.rect.size.width, event.paint.rect.size.height); break;
+        case GUI_Event::Type::MouseDown: dbgprintf("WID=%x MouseDown %d,%d\n", event.window_id, event.mouse.position.x, event.mouse.position.y); break;
+        case GUI_Event::Type::MouseUp: dbgprintf("WID=%x MouseUp %d,%d\n", event.window_id, event.mouse.position.x, event.mouse.position.y); break;
+        case GUI_Event::Type::MouseMove: dbgprintf("WID=%x MouseMove %d,%d\n", event.window_id, event.mouse.position.x, event.mouse.position.y); break;
+        }
+
+        if (event.type == GUI_Event::Type::MouseDown)
+            terminal.paint();
+    }
+    return 0;
+}