Multicursor clipboard

src/text_editor/clipboard.cpp

@@ -0,0 +1,62 @@
+String        SavedClipboardString;
+Array<String> SavedClipboardCursors;
+
+void CopyToClipboard(Window *window) {
+    Allocator sys_allocator = GetSystemAllocator();
+
+    SavedClipboardCursors.allocator = sys_allocator;
+    if (SavedClipboardCursors.data) {
+        For(SavedClipboardCursors) Dealloc(sys_allocator, &it.data);
+        SavedClipboardCursors.clear();
+    }
+
+    if (SavedClipboardString.data) {
+        Dealloc(sys_allocator, &SavedClipboardString.data);
+        SavedClipboardString = {};
+    }
+
+    // First, if there is no selection - select the entire line
+    For(window->cursors) {
+        if (GetRangeSize(it.range) == 0) {
+            Line line = FindLine(window->buffer, it.range.min);
+            it.range  = line.range;
+        }
+    }
+
+    For(window->cursors) {
+        String string = GetString(window->buffer, it.range);
+        String copy   = Copy(sys_allocator, string);
+        SavedClipboardCursors.add(copy);
+    }
+
+    // @todo: maybe only add new line if there is no new line at the end, experiment with it
+    SavedClipboardString = Merge(sys_allocator, SavedClipboardCursors, "\n");
+    SetClipboardText(SavedClipboardString.data);
+}
+
+void PasteFromClipboard(Window *window) {
+    Scratch     scratch;
+    const char *text   = GetClipboardText();
+    String      string = text;
+
+    // Regular paste
+    if (string != SavedClipboardString || SavedClipboardCursors.len != window->cursors.len) {
+        BeforeEdit(window);
+        Array<Edit> edits = {scratch};
+        For(window->cursors) AddEdit(&edits, it.range, string);
+        ApplyEdits(window, edits);
+        AfterEdit(window, edits);
+        return;
+    }
+
+    // Multicursor paste
+    BeforeEdit(window);
+    Array<Edit> edits = {scratch};
+    for (int64_t i = 0; i < window->cursors.len; i += 1) {
+        String  string = SavedClipboardCursors[i];
+        Cursor &it     = window->cursors[i];
+        AddEdit(&edits, it.range, string);
+    }
+    ApplyEdits(window, edits);
+    AfterEdit(window, edits);
+}

src/text_editor/layout.cpp

@@ -379,12 +379,16 @@ void BeforeEdit(Window *window) {
     window->history.debug_edit_phase += 1;
     Assert(window->cursors.len);
     SaveHistoryBeforeMergeCursor(window, &window->history.undo_stack);
+
+    // Clear redo stack
+    {
         For(window->history.redo_stack) {
             it.cursors.dealloc();
             ForItem(edit, it.edits) Dealloc(it.edits.allocator, &edit.string.data);
             it.edits.dealloc();
         }
         window->history.redo_stack.dealloc();
+    }
     MergeCursors(window);
 }
 

src/text_editor/main.cpp

@@ -3,12 +3,14 @@
 #include "raylib.h"
 #include "raymath.h"
 
-// @todo: add history (undo, redo)
 // @todo: add clipboard history?
 // @todo: mouse double click
+// @todo: context menu
+// @todo: toy around with acme ideas
 #include "rect2.cpp"
 #include "buffer.cpp"
 #include "layout.cpp"
+#include "clipboard.cpp"
 #include "utils.cpp"
 #include "event_recording.cpp"
 
@@ -85,6 +87,7 @@ int main() {
     int64_t frame = -1;
     InitEventRecording();
     while (!WindowShouldClose()) {
+        Clear(&FrameArena);
         For(windows) {
             Assert(it.cursors.len);
             it.main_cursor_begin_frame = it.cursors[0];
@@ -272,46 +275,18 @@ int main() {
                 }
             }
 
-            // @todo: improve behaviour of all copy pasting
             if (IsKeyDown(KEY_LEFT_CONTROL) && IsKeyPressed(KEY_C)) {
-                Array<String> strings = {FrameArena};
+                CopyToClipboard(focused_window);
-                For(focused_window->cursors) {
-                    String string = GetString(focused_window->buffer, it.range);
-                    strings.add(string);
-                }
-                String to_save = Merge(FrameArena, strings, "\n");
-                SetClipboardText(to_save.data);
             }
             if (IsKeyDown(KEY_LEFT_CONTROL) && (IsKeyPressed(KEY_V) || IsKeyPressedRepeat(KEY_V))) {
-                BeforeEdit(focused_window);
+                PasteFromClipboard(focused_window);
-                Array<Edit> edits  = {FrameArena};
-                const char *text   = GetClipboardText();
-                String      string = text;
-                For(focused_window->cursors) {
-                    AddEdit(&edits, it.range, string);
-                }
-                ApplyEdits(focused_window, edits);
-                AfterEdit(focused_window, edits);
             }
             if (IsKeyDown(KEY_LEFT_CONTROL) && (IsKeyPressed(KEY_X) || IsKeyPressedRepeat(KEY_X))) {
-                // First, if there is no selection - select the entire line
+                CopyToClipboard(focused_window);
-                For(focused_window->cursors) {
-                    if (GetRangeSize(it.range) == 0) {
-                        Line line = FindLine(focused_window->buffer, it.range.min);
-                        it.range  = line.range;
-                    }
-                }
 
                 BeforeEdit(focused_window);
                 Array<Edit> edits = {FrameArena};
-                Array<String> strings = {FrameArena};
+                For(focused_window->cursors) AddEdit(&edits, it.range, "");
-                For(focused_window->cursors) {
-                    AddEdit(&edits, it.range, "");
-                    String string = GetString(focused_window->buffer, it.range);
-                    strings.add(string);
-                }
-                String to_save = Merge(FrameArena, strings, "\n");
-                SetClipboardText(to_save.data);
                 ApplyEdits(focused_window, edits);
                 AfterEdit(focused_window, edits);
             }