From b0c1e2ab5a46a9ab040d8b2be37196d4d00d3944 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Bj=C3=B6rn=20Linse?= <bjorn.linse@gmail.com>
Date: Sat, 20 Apr 2019 20:22:54 +0200
Subject: [PATCH] api: make nvim__inspect_cell support multiple grids

---
 src/nvim/api/vim.c | 30 ++++++++++++++++++++++++------
 1 file changed, 24 insertions(+), 6 deletions(-)

diff --git a/src/nvim/api/vim.c b/src/nvim/api/vim.c
index 2e8ca384b4..72eb68b650 100644
--- a/src/nvim/api/vim.c
+++ b/src/nvim/api/vim.c
@@ -30,6 +30,7 @@
 #include "nvim/memline.h"
 #include "nvim/memory.h"
 #include "nvim/message.h"
+#include "nvim/popupmnu.h"
 #include "nvim/edit.h"
 #include "nvim/eval.h"
 #include "nvim/eval/typval.h"
@@ -2239,16 +2240,33 @@ void nvim_select_popupmenu_item(Integer item, Boolean insert, Boolean finish,
 }
 
 /// NB: if your UI doesn't use hlstate, this will not return hlstate first time
-Array nvim__inspect_cell(Integer row, Integer col, Error *err)
+Array nvim__inspect_cell(Integer grid, Integer row, Integer col, Error *err)
 {
   Array ret = ARRAY_DICT_INIT;
-  if (row < 0 || row >= default_grid.Rows
-      || col < 0 || col >= default_grid.Columns) {
+
+  // TODO(bfredl): if grid == 0 we should read from the compositor's buffer.
+  // The only problem is that it does not yet exist.
+  ScreenGrid *g = &default_grid;
+  if (grid == pum_grid.handle) {
+    g = &pum_grid;
+  } else if (grid > 1) {
+    win_T *wp = get_win_by_grid_handle((handle_T)grid);
+    if (wp != NULL && wp->w_grid.chars != NULL) {
+      g = &wp->w_grid;
+    } else {
+      api_set_error(err, kErrorTypeValidation,
+                    "No grid with the given handle");
+      return ret;
+    }
+  }
+
+  if (row < 0 || row >= g->Rows
+      || col < 0 || col >= g->Columns) {
     return ret;
   }
-  size_t off = default_grid.line_offset[(size_t)row] + (size_t)col;
-  ADD(ret, STRING_OBJ(cstr_to_string((char *)default_grid.chars[off])));
-  int attr = default_grid.attrs[off];
+  size_t off = g->line_offset[(size_t)row] + (size_t)col;
+  ADD(ret, STRING_OBJ(cstr_to_string((char *)g->chars[off])));
+  int attr = g->attrs[off];
   ADD(ret, DICTIONARY_OBJ(hl_get_attr_by_id(attr, true, err)));
   // will not work first time
   if (!highlight_use_hlstate()) {