multigrid: Put everything on default_grid if not ext_multigrid

src/nvim/api/ui.c

@@ -257,9 +257,7 @@ void nvim_ui_try_resize_grid(uint64_t channel_id, Integer grid, Integer width,
     return;
   }
 
-  // TODO(utkarshme): Check if grid exists
+  ui_grid_resize((GridHandle)grid, (int)width, (int)height, error);
-
-  ui_grid_resize((GridHandle)grid, (int)width, (int)height);
 }
 
 /// Pushes data into UI.UIData, to be consumed later by remote_ui_flush().

src/nvim/globals.h

@@ -164,6 +164,8 @@ EXTERN int screen_Columns INIT(= 0);        /* actual size of ScreenLines[] */
 EXTERN ScreenGrid default_grid INIT(= { 0, NULL, NULL, NULL, NULL, 0, 0, 0, 0,
                                         0, 0 });
 
+#define DEFAULT_GRID_HANDLE 1               /* handle for the default_grid */
+
 /*
  * When vgetc() is called, it sets mod_mask to the set of modifiers that are
  * held down based on the MOD_MASK_* symbols that are read first.

src/nvim/screen.c

@@ -118,11 +118,11 @@
 
 #define MB_FILLER_CHAR '<'  /* character used when a double-width character
                              * doesn't fit. */
+#define W_ENDCOL(wp)   (wp->w_wincol + wp->w_width)
+#define W_ENDROW(wp)   (wp->w_winrow + wp->w_height)
 
-#define W_ENDCOL(wp)   (wp->w_width + wp->w_wincol)
+// Get the offset for the current line buffer when redrawing a line for a grid
-#define W_ENDROW(wp)   (wp->w_height + wp->w_winrow)
+#define GRID_TMPLINE(grid) ((grid)->Rows * (grid)->Columns)
-
-#define DEFAULT_GRID_HANDLE 1
 
 static match_T search_hl;       /* used for 'hlsearch' highlight matching */
 
@@ -1772,7 +1772,7 @@ static void fold_line(win_T *wp, long fold_count, foldinfo_T *foldinfo, linenr_T
    * 6. set highlighting for the Visual area an other text
    */
   col = 0;
-  off = (int)(grid->Rows * grid->Columns);
+  off = (int)GRID_TMPLINE(grid);
 
   /*
    * 1. Add the cmdwin_type for the command-line window
@@ -2674,7 +2674,7 @@ win_line (
       cur = cur->next;
   }
 
-  off = (unsigned)(grid->Rows * grid->Columns);
+  off = (unsigned)GRID_TMPLINE(grid);
   int col = 0;  // Visual column on screen.
   if (wp->w_p_rl) {
     // Rightleft window: process the text in the normal direction, but put
@@ -4274,7 +4274,7 @@ win_line (
       }
 
       col = 0;
-      off = (unsigned)(grid->Rows * grid->Columns);
+      off = (unsigned)GRID_TMPLINE(grid);
       if (wp->w_p_rl) {
         col = grid->Columns - 1;          /* col is not used if breaking! */
         off += col;
@@ -4366,7 +4366,20 @@ static void grid_move_line(ScreenGrid *grid, int row, int coloff, int endcol,
   if (endcol > grid->Columns)
     endcol = grid->Columns;
 
-  off_from = (unsigned)(grid->Rows * grid->Columns);
+  // If UI is not externalized, merge the contents of global and window grids
+  if (!ui_is_external(kUIMultigrid) && grid != &default_grid) {
+    row += grid->OffsetRow;
+    coloff += grid->OffsetColumn;
+    memcpy(default_grid.ScreenLines + GRID_TMPLINE(&default_grid),
+           grid->ScreenLines + GRID_TMPLINE(grid),
+           sizeof(schar_T) * grid->Columns);
+    memcpy(default_grid.ScreenAttrs + GRID_TMPLINE(&default_grid),
+           grid->ScreenAttrs + GRID_TMPLINE(grid),
+           sizeof(sattr_T) * grid->Columns);
+    grid = &default_grid;
+  }
+
+  off_from = (unsigned)GRID_TMPLINE(grid);
   off_to = grid->LineOffset[row] + coloff;
   max_off_from = off_from + grid->Columns;
   max_off_to = grid->LineOffset[row] + grid->Columns;
@@ -4460,7 +4473,8 @@ static void grid_move_line(ScreenGrid *grid, int row, int coloff, int endcol,
     // blank out the rest of the line
     // TODO(bfredl): we could cache winline widths
     while (col < clear_width) {
-        if (grid->ScreenLines[off_to][0] != ' ' || grid->ScreenLines[off_to][1] != NUL
+      if (grid->ScreenLines[off_to][0] != ' '
+          || grid->ScreenLines[off_to][1] != NUL
           || grid->ScreenAttrs[off_to] != bg_attr) {
         grid->ScreenLines[off_to][0] = ' ';
         grid->ScreenLines[off_to][1] = NUL;
@@ -5111,7 +5125,7 @@ win_redr_custom (
           *wp->w_p_stl == NUL ? 0 : OPT_LOCAL);
     }
 
-    col += wp->w_winrow;
+    col += wp->w_wincol;
   }
 
   if (maxwidth <= 0)
@@ -5258,7 +5272,9 @@ void grid_getbytes(ScreenGrid *grid, int row, int col, char_u *bytes,
 {
   unsigned off;
 
-  if (grid == NULL) {
+  if (!ui_is_external(kUIMultigrid)) {
+    row += grid->OffsetRow;
+    col += grid->OffsetColumn;
     grid = &default_grid;
   }
 
@@ -5321,6 +5337,13 @@ void grid_puts_len(ScreenGrid *grid, char_u *text, int textlen, int row,
     grid = &default_grid;
   }
 
+  // If UI is not externalized, keep working on the default grid
+  if (!ui_is_external(kUIMultigrid) && grid != &default_grid) {
+    row += grid->OffsetRow;
+    col += grid->OffsetColumn;
+    grid = &default_grid;
+  }
+
   // safety check
   if (grid->ScreenLines == NULL || row >= grid->Rows || col >= grid->Columns) {
     return;
@@ -5777,6 +5800,15 @@ void grid_fill(ScreenGrid *grid, int start_row, int end_row, int start_col,
     grid = &default_grid;
   }
 
+  // if grids are not externalized, keep working on the default_grid
+  if (!ui_is_external(kUIMultigrid) && grid != &default_grid) {
+    start_row += grid->OffsetRow;
+    end_row += grid->OffsetRow;
+    start_col += grid->OffsetColumn;
+    end_col += grid->OffsetColumn;
+    grid = &default_grid;
+  }
+
   if (end_row > grid->Rows)            // safety check
     end_row = grid->Rows;
   if (end_col > grid->Columns)         // safety check
@@ -6275,6 +6307,14 @@ int grid_ins_lines(ScreenGrid *grid, int row, int line_count, int end,
     grid = &default_grid;
   }
 
+  // If UI is not externalized, keep working on default grid
+  if (!ui_is_external(kUIMultigrid) && grid != &default_grid) {
+    row += grid->OffsetRow;
+    end += grid->OffsetRow;
+    col += grid->OffsetColumn;
+    grid = &default_grid;
+  }
+
   if (!screen_valid(TRUE) || line_count <= 0) {
     return FAIL;
   }
@@ -6326,6 +6366,14 @@ int grid_del_lines(ScreenGrid *grid, int row, int line_count, int end,
     grid = &default_grid;
   }
 
+  // If UI is not externalized, keep working on default grid
+  if (!ui_is_external(kUIMultigrid) && grid != &default_grid) {
+    row += grid->OffsetRow;
+    end += grid->OffsetRow;
+    col += grid->OffsetColumn;
+    grid = &default_grid;
+  }
+
   if (!screen_valid(TRUE) || line_count <= 0) {
     return FAIL;
   }

src/nvim/ui.c

@@ -440,13 +440,16 @@ Array ui_array(void)
   return all_uis;
 }
 
-void ui_grid_resize(GridHandle grid_handle, int width, int height)
+void ui_grid_resize(GridHandle grid_handle, int width, int height, Error *error)
 {
-  win_T *wp = get_win_by_grid_handle(grid_handle);
+  if (grid_handle == DEFAULT_GRID_HANDLE) {
+    screen_resize(width, height);
+    return;
+  }
 
+  win_T *wp = get_win_by_grid_handle(grid_handle);
   if (wp == NULL) {
-    //TODO(utkarshme): error out
+    api_set_error(error, kErrorTypeValidation, "No window with the given handle");
-    abort();
     return;
   }