feat: add global blend option (#609)

* feat: add blend option for hl groups to global_opts

* chore: fix formatting

---------

Co-authored-by: Alexander Courtis <alex@courtis.org>

Author: asiryk

README.md

@@ -119,6 +119,11 @@ require'nvim-web-devicons'.setup {
  -- set the light or dark variant manually, instead of relying on `background`
  -- (default to nil)
  variant = "light|dark";
+ -- override blend value for all highlight groups :h highlight-blend.
+ -- setting this value to `0` will make all icons opaque. in practice this means
+ -- that icons width will not be affected by pumblend option (see issue #608)
+ -- (default to nil)
+ blend = 0;
  -- same as `override` but specifically for overrides by filename
  -- takes effect when `strict` is true
  override_by_filename = {

lua/nvim-web-devicons.lua

@@ -53,6 +53,7 @@ local global_opts = {
   default = false,
   color_icons = true,
   variant = nil,
+  blend = nil,
 }
 
 ---Change all keys in a table to lowercase
@@ -129,10 +130,16 @@ local function set_up_highlight(icon_data)
 
   local hl_group = get_highlight_name(icon_data)
   if hl_group and (icon_data.color or icon_data.cterm_color) then
-    nvim_set_hl(0, get_highlight_name(icon_data), {
+    local hl_def = {
       fg = icon_data.color,
       ctermfg = tonumber(icon_data.cterm_color),
-    })
+    }
+
+    if global_opts.blend then
+      hl_def.blend = global_opts.blend
+    end
+
+    nvim_set_hl(0, get_highlight_name(icon_data), hl_def)
   end
 end
 
@@ -292,6 +299,10 @@ function M.setup(opts)
     refresh_icons()
   end
 
+  if type(user_icons.blend) == "number" then
+    global_opts.blend = user_icons.blend
+  end
+
   apply_user_icons()
 
   M.set_up_highlights()