update

colors/paper-tonic.lua

@@ -847,15 +847,8 @@ local highlight_groups = {
     IndentGuidesOdd = {bg = c_bg_hl},
     IndentGuidesEven = {bg = c_bg_hl_strong},
 
-    --[[ 4.4.7. NERDTree ]]
-    NERDTreeCWD = 'Label',
-    NERDTreeUp = 'Operator',
-    NERDTreeDir = 'Directory',
-    NERDTreeDirSlash = 'Delimiter',
-    NERDTreeOpenable = 'NERDTreeDir',
-    NERDTreeClosable = 'NERDTreeOpenable',
-    NERDTreeExecFile = 'Function',
-    NERDTreeLinkTarget = 'Tag',
+    --[[ 4.4.7. Netrw ]]
+    netrwMarkFile = 'Search',
 
     --[[ 4.4.8. nvim-treesitter ]]
     TSConstBuiltin = 'Constant',

lua/paper-tonic.lua

@@ -7,7 +7,9 @@
 --[[/* VARS */]]
 
 --- Which set of colors to use.
-local _USE_256 = tonumber(vim.go.t_Co) > 255 or string.find(vim.env.TERM, '256')
+local has_t_Co = pcall(function() return vim.go.t_Co end)
+local _USE_256 = (has_t_Co and tonumber(vim.go.t_Co) > 255) or string.find(vim.env.TERM, '256')
+
 
 --- Indicating nothing for a highlight field.
 local _NONE = 'NONE'