fix(moonfly): override part of highlights instead of replacing them

lua/plugins/moonfly.lua

@@ -1,18 +1,27 @@
 -- https://github.com/bluz71/vim-moonfly-colors
 
+local utils = require("utils")
+
+local function override_hl(hl_name, opts)
+    local hl = vim.api.nvim_get_hl(0, { name = hl_name, })
+    utils.update_table(hl, opts)
+    vim.api.nvim_set_hl(0, hl_name, hl)
+end
+
 local function setup()
     vim.g.moonflyNormalFloat = true
     vim.g.moonflyCursorColor = true
     vim.g.moonflyWinSeparator = 2
 
-    local custom_highlight = vim.api.nvim_create_augroup("CustomMoonflyHighlight", {})
+    local custom_highlight = vim.api.nvim_create_augroup(
+        "CustomMoonflyHighlight", {})
     vim.api.nvim_create_autocmd("ColorScheme", {
         pattern = "moonfly",
         callback = function ()
-            vim.api.nvim_set_hl(0, "DiffAdd", { bg = "#364143" })
-            vim.api.nvim_set_hl(0, "DiffText", { bg = "#3e4b6b" })
-            vim.api.nvim_set_hl(0, "DiffChange", { bg = "#25293c" })
-            vim.api.nvim_set_hl(0, "DiffDelete", { bg = "#443244" })
+            override_hl("DiffAdd", { bg = "#364143", })
+            override_hl("DiffText", { bg = "#3e4b6b", })
+            override_hl("DiffChange", { bg = "#25293c", })
+            override_hl("DiffDelete", { bg = "#443244", })
         end,
         group = custom_highlight,
     })

lua/utils.lua

@@ -98,4 +98,17 @@ function M.try_require(module, err_title, on_success)
     M.err(resp, err_title)
 end
 
+--- Update table t1 with values in t2.
+--- @param table table: The table to update
+--- @param values table: The table with new values
+function M.update_table(table, values)
+    for k, v in pairs(values) do
+        if type(v) == "table" and type(table[k] or false) == "table" then
+            M.update_table(table[k], values[k])
+        else
+            table[k] = v
+        end
+    end
+end
+
 return M