wip: add clipboard support

programs/src/texteditor/main.cpp

@@ -13,6 +13,7 @@
 #include <gui/truetype.hpp>
 #include <gui/svg.hpp>
 #include <gui/dialogs.hpp>
+#include <gui/clipboard.hpp>
 #include <gui/stb_math.h>
 
 extern "C" {
@@ -442,6 +443,64 @@ static void set_status(const char* msg) {
     g_status_msg[sizeof(g_status_msg) - 1] = '\0';
 }
 
+static int selection_length() {
+    if (!g_has_selection) return 0;
+    int ss, se;
+    sel_range(&ss, &se);
+    return se - ss;
+}
+
+static bool copy_selection_to_clipboard() {
+    int len = selection_length();
+    if (len <= 0) {
+        set_status("Nothing selected");
+        return false;
+    }
+
+    int ss, se;
+    sel_range(&ss, &se);
+    if (!gui::clipboard_set_text(g_buffer + ss, len)) {
+        set_status("Copy failed");
+        return false;
+    }
+
+    set_status("Copied selection");
+    return true;
+}
+
+static bool cut_selection_to_clipboard() {
+    if (!copy_selection_to_clipboard())
+        return false;
+
+    delete_selection();
+    set_status("Cut selection");
+    return true;
+}
+
+static bool paste_from_clipboard() {
+    int clip_len = 0;
+    char* clip_text = gui::clipboard_get_text_alloc(&clip_len);
+    if (clip_text == nullptr || clip_len <= 0) {
+        if (clip_text) montauk::mfree(clip_text);
+        set_status("Clipboard is empty");
+        return false;
+    }
+
+    int replaced_len = selection_length();
+    if (g_buf_len - replaced_len + clip_len >= MAX_CAP) {
+        montauk::mfree(clip_text);
+        set_status("Clipboard text too large");
+        return false;
+    }
+
+    if (g_has_selection)
+        delete_selection();
+    insert_string(clip_text, clip_len);
+    montauk::mfree(clip_text);
+    set_status("Pasted clipboard");
+    return true;
+}
+
 static bool looks_binary(const char* data, int len) {
     if (!data || len <= 0) return false;
 
@@ -951,6 +1010,24 @@ static bool handle_key(Montauk::KeyEvent& key, int win_id) {
         return true;
     }
 
+    // Ctrl+C: copy
+    if (key.ctrl && !key.alt && (key.ascii == 'c' || key.ascii == 'C')) {
+        copy_selection_to_clipboard();
+        return true;
+    }
+
+    // Ctrl+X: cut
+    if (key.ctrl && !key.alt && (key.ascii == 'x' || key.ascii == 'X')) {
+        cut_selection_to_clipboard();
+        return true;
+    }
+
+    // Ctrl+V: paste
+    if (key.ctrl && !key.alt && (key.ascii == 'v' || key.ascii == 'V')) {
+        paste_from_clipboard();
+        return true;
+    }
+
     // Arrow keys
     if (key.scancode == 0x48) { // Up
         if (key.shift) start_selection(); else if (g_has_selection) clear_selection();