Writing text

src/text_editor/buffer_multi_cursor.cpp

@@ -119,6 +119,12 @@ void ApplyEdits(Buffer *buffer, Array<Edit> edits) {
         edits = edits_copy;
     }
 
+#if DEBUG_BUILD
+    for (int64_t i = 0; i < edits.len - 1; i += 1) {
+        Assert(edits[i].range.min <= edits[i + 1].range.min);
+    }
+#endif
+
     // @optimize: we can do all edits in one go with less memory copies probably
     // or something else entirely
     Int offset = 0;

src/text_editor/text_editor.cpp

@@ -51,7 +51,7 @@ int main(void) {
         view.buffer = CreateBuffer(Perm);
         {
             Scratch scratch;
-            for (int i = 0; i < 150; i += 1) {
+            for (int i = 0; i < 2; i += 1) {
                 String   s   = Format(scratch, "line1: %d line2: %d line3: %d line4: %d line5: %d line6: %d line1: %d line2: %d line3: %d line4: %d line5: %d line6: %d\n", i, i, i, i, i, i, i, i, i, i, i, i);
                 String16 s16 = ToString16(scratch, s);
                 ReplaceText(view.buffer, GetEndAsRange(*view.buffer), s16);

src/text_editor/view.cpp

@@ -122,10 +122,37 @@ Int MoveCaret(Buffer &buffer, Int pos, int direction, bool ctrl_pressed) {
     }
 }
 
+void AfterEdit(View *view, Array<Edit> edits) {
+    //
+    // Offset all cursors by edits
+    //
+    Scratch      scratch;
+    Array<Caret> new_cursors = TightCopy(scratch, view->carets);
+    ForItem(edit, edits) {
+        Int remove_size = GetSize(edit.range);
+        Int insert_size = edit.string.len;
+        Int offset      = insert_size - remove_size;
+
+        for (Int i = 0; i < view->carets.len; i += 1) {
+            Caret &old_cursor = view->carets.data[i];
+            Caret &new_cursor = new_cursors.data[i];
+            if (old_cursor.range.min == edit.range.min) {
+                new_cursor.range.min = new_cursor.range.max = new_cursor.range.min + insert_size;
+            } else if (old_cursor.range.min > edit.range.min) {
+                new_cursor.range.min = new_cursor.range.max = new_cursor.range.min + offset;
+            }
+        }
+    }
+    for (Int i = 0; i < view->carets.len; i += 1) view->carets[i] = new_cursors[i];
+
+    // Make sure all cursors are in range
+    For(view->carets) it.range = Clamp(*view->buffer, it.range);
+}
+
 void HandleKeybindings(View *_view) {
-    View   &view                       = *_view;
-    Buffer &buf                        = *view.buffer;
-    Caret   main_cursor_on_begin_frame = view.carets[0];
+    View   &view                      = *_view;
+    Buffer &buf                       = *view.buffer;
+    Caret   main_caret_on_begin_frame = view.carets[0];
 
     if (IsKeyDown(KEY_F1)) {
         view.scroll.x -= GetMouseWheelMove() * 48;
@@ -148,12 +175,26 @@ void HandleKeybindings(View *_view) {
         }
     }
 
+    for (int c = GetCharPressed(); c; c = GetCharPressed()) {
+        String16    string = L"?";
+        UTF16Result result = UTF32ToUTF16((uint32_t)c);
+        if (!result.error) string = {(wchar_t *)result.out_str, result.len};
+        // we interpret 2 byte sequences as 1 byte when rendering but we still
+        // want to read them properly.
+        MergeCarets(&view.carets);
+        Scratch     scratch;
+        Array<Edit> edits = {scratch};
+        For(view.carets) AddEdit(&edits, it.range, string);
+        ApplyEdits(view.buffer, edits);
+        AfterEdit(&view, edits);
+    }
+
     // Scrolling with caret
     // @refactor: this should happen after we calculate rect for the view
     // Usually in other text editors apart from view there is also a 'window'
     //  which is exactly the thing which shows the view, will need
     // to think about this later
-    if (!AreEqual(main_cursor_on_begin_frame, view.carets[0])) {
+    if (!AreEqual(main_caret_on_begin_frame, view.carets[0])) {
 
         Caret c     = view.carets[0];
         Int   front = GetFront(c);

src/text_editor/view_draw.cpp

@@ -49,7 +49,7 @@ void DrawCaret(const View &view, Caret it) {
         XY max = PosToXY(buf, it.range.max);
 
         Rect2I vlines = GetVisibleCells(view);
-        for (Int line = vlines.min.y; line <= vlines.max.y; line += 1) {
+        for (Int line = vlines.min.y; line <= vlines.max.y && line >= 0 && line < view.buffer->line_starts.len; line += 1) {
             Range range = GetLine(buf, line);
             range -= range.min;
             range.min = Clamp(range.min, vlines.min.x, vlines.max.x);