fix color transparancy issues

init.lua

@@ -274,9 +274,12 @@ require('custom.colorizer')
 require('custom.keymaps')
 require('custom.harpoon')
 require('custom.mason')
-require('custom.bufferline')
 require('custom.kulala')
 require('custom.rainbow')
 require('custom.none-ls')
 require('custom.gitsigns')
 require('custom.colortheme')
+-- bufferline derives its colors from the Normal highlight group at setup()
+-- time, so it must load after the colorscheme is applied above, or it
+-- captures the pre-colorscheme (solid) background instead of the final one.
+require('custom.bufferline')

lua/custom/colortheme.lua

@@ -1,9 +1,3 @@
-vim.api.nvim_create_autocmd("ColorScheme", {
-	callback = function()
-		vim.api.nvim_set_hl(0, "NormalFloat", { bg = "NONE", fg = "#cdd6f5" })
-		vim.api.nvim_set_hl(0, "FloatBorder", { bg = "NONE", fg = "#3e4452" })
-	end
-})
 -- Detect dark or light theme saved in .colorscheme. defaults to dark
 local background_mode
 local f = io.open(os.getenv('HOME') .. '/.colorscheme', 'r')
@@ -15,6 +9,26 @@ else
 	background_mode = 'dark'
 end
 
+-- Applying these via the ColorScheme autocmd (rather than one-off `:highlight`
+-- calls after the colorscheme is set) means every plugin that listens for
+-- ColorScheme to pick up transparency - not just whatever runs immediately
+-- after this file - sees the final, transparent highlights too.
+vim.api.nvim_create_autocmd("ColorScheme", {
+	callback = function()
+		vim.api.nvim_set_hl(0, "NormalFloat", { bg = "NONE", fg = "#cdd6f5" })
+		vim.api.nvim_set_hl(0, "FloatBorder", { bg = "NONE", fg = "#3e4452" })
+		if background_mode ~= 'dark' then
+			vim.api.nvim_set_hl(0, "Normal", { bg = "NONE" })
+			vim.api.nvim_set_hl(0, "StatusLine", { bg = "NONE" })
+			vim.api.nvim_set_hl(0, "LineNr", { bg = "NONE" })
+			vim.api.nvim_set_hl(0, "CursorLineNr", { bg = "NONE" })
+			vim.api.nvim_set_hl(0, "TabLine", { bg = "NONE" })
+			vim.api.nvim_set_hl(0, "Visual", { bg = "NONE" })
+			vim.api.nvim_set_hl(0, "NormalNC", { bg = "NONE" })
+		end
+	end
+})
+
 -- use ayu theme for dark mode, selenized for light mode
 if background_mode == 'dark' then
 	vim.g.ayucolor = background_mode
@@ -23,6 +37,4 @@ if background_mode == 'dark' then
 else
 	vim.cmd("colorscheme zenbones")
 	vim.cmd("set background=" .. background_mode)
-	vim.cmd(
-		'highlight Normal ctermbg=NONE guibg=NONE | highlight StatusLine ctermbg=NONE guibg=NONE | highlight LineNr ctermbg=NONE guibg=NONE | highlight CursorLineNr ctermbg=NONE guibg=NONE | highlight TabLine ctermbg=NONE guibg=NONE | highlight Visual ctermbg=NONE guibg=NONE | highlight NormalNC ctermbg=NONE guibg=NONE')
 end