feat: desktop environment improvements

2026-02-20 09:03:30 +01:00
parent 987a85da27
commit f018ab6e4d
23 changed files with 2479 additions and 644 deletions
@@ -0,0 +1,151 @@
+/*
+    * app_klog.cpp
+    * ZenithOS Desktop - Kernel Log viewer (tails the kernel ring buffer)
+    * Copyright (c) 2026 Daniel Hammer
+*/
+
+#include "apps_common.hpp"
+
+// ============================================================================
+// Kernel Log state
+// ============================================================================
+
+static constexpr int KLOG_READ_SIZE = 65536; // matches kernel ring buffer size
+static constexpr int KLOG_POLL_MS   = 250;
+
+struct KlogState {
+    TerminalState term;
+    char* klog_buf;
+    int last_len;
+    char last_tail_byte;
+    uint64_t last_poll_ms;
+};
+
+// ============================================================================
+// Re-feed the last screenful of log into the terminal
+// ============================================================================
+
+static void klog_refeed(KlogState* klog, int n) {
+    // Find start of last `rows` lines from the end of the buffer
+    int lines_needed = klog->term.rows;
+    int start = 0;
+    for (int i = n - 1; i >= 0 && lines_needed > 0; i--) {
+        if (klog->klog_buf[i] == '\n') {
+            lines_needed--;
+            if (lines_needed == 0) { start = i + 1; break; }
+        }
+    }
+
+    // Clear terminal
+    int total = klog->term.cols * klog->term.rows;
+    for (int i = 0; i < total; i++)
+        klog->term.cells[i] = {' ', colors::TERM_FG, colors::TERM_BG};
+    klog->term.cursor_x = 0;
+    klog->term.cursor_y = 0;
+    klog->term.current_fg = colors::TERM_FG;
+    klog->term.current_bg = colors::TERM_BG;
+
+    terminal_feed(&klog->term, klog->klog_buf + start, n - start);
+}
+
+// ============================================================================
+// Callbacks
+// ============================================================================
+
+static void klog_on_draw(Window* win, Framebuffer& fb) {
+    KlogState* klog = (KlogState*)win->app_data;
+    if (!klog) return;
+
+    Rect cr = win->content_rect();
+    terminal_render(&klog->term, win->content, cr.w, cr.h);
+}
+
+static void klog_on_mouse(Window* win, MouseEvent& ev) {
+    // Read-only viewer — no mouse interaction needed
+}
+
+static void klog_on_key(Window* win, const Zenith::KeyEvent& key) {
+    // Read-only viewer — no keyboard input
+}
+
+static void klog_on_poll(Window* win) {
+    KlogState* klog = (KlogState*)win->app_data;
+    if (!klog) return;
+
+    uint64_t now = zenith::get_milliseconds();
+    if (now - klog->last_poll_ms < KLOG_POLL_MS) return;
+    klog->last_poll_ms = now;
+
+    int n = (int)zenith::read_klog(klog->klog_buf, KLOG_READ_SIZE);
+    if (n <= 0 && klog->last_len <= 0) return;
+
+    if (n > klog->last_len) {
+        // Buffer grew — feed only the new portion
+        terminal_feed(&klog->term, klog->klog_buf + klog->last_len, n - klog->last_len);
+    } else if (n == klog->last_len && n > 0) {
+        // Same size — check if the tail changed (ring buffer wrapped)
+        if (klog->klog_buf[n - 1] != klog->last_tail_byte) {
+            klog_refeed(klog, n);
+        } else {
+            return; // nothing changed
+        }
+    } else if (n < klog->last_len) {
+        // Unexpected shrink — full re-render
+        klog_refeed(klog, n);
+    }
+
+    klog->last_len = n;
+    if (n > 0) klog->last_tail_byte = klog->klog_buf[n - 1];
+}
+
+static void klog_on_close(Window* win) {
+    KlogState* klog = (KlogState*)win->app_data;
+    if (klog) {
+        if (klog->term.cells) zenith::mfree(klog->term.cells);
+        if (klog->term.alt_cells) zenith::mfree(klog->term.alt_cells);
+        if (klog->klog_buf) zenith::mfree(klog->klog_buf);
+        zenith::mfree(klog);
+        win->app_data = nullptr;
+    }
+}
+
+// ============================================================================
+// Kernel Log launcher
+// ============================================================================
+
+void open_klog(DesktopState* ds) {
+    int idx = desktop_create_window(ds, "Kernel Log", 160, 60, 720, 480);
+    if (idx < 0) return;
+
+    Window* win = &ds->windows[idx];
+    Rect cr = win->content_rect();
+    int cols = cr.w / FONT_WIDTH;
+    int rows = cr.h / FONT_HEIGHT;
+
+    KlogState* klog = (KlogState*)zenith::malloc(sizeof(KlogState));
+    zenith::memset(klog, 0, sizeof(KlogState));
+
+    // Initialize the terminal cell grid (reuse terminal infrastructure)
+    terminal_init_cells(&klog->term, cols, rows);
+
+    // Allocate klog read buffer
+    klog->klog_buf = (char*)zenith::malloc(KLOG_READ_SIZE);
+    klog->last_len = 0;
+    klog->last_tail_byte = 0;
+    klog->last_poll_ms = 0;
+
+    // Do an initial read to show existing log content
+    int n = (int)zenith::read_klog(klog->klog_buf, KLOG_READ_SIZE);
+    if (n > 0) {
+        klog_refeed(klog, n);
+        klog->last_len = n;
+        klog->last_tail_byte = klog->klog_buf[n - 1];
+    }
+
+    win->app_data = klog;
+    win->on_draw = klog_on_draw;
+    win->on_mouse = klog_on_mouse;
+    win->on_key = klog_on_key;
+    win->on_close = klog_on_close;
+    win->on_poll = klog_on_poll;
+}