feat(cache): auto-detect config updates & rebuild cache

see #147

Author: scottmckendry

lua/cyberdream/cache.lua

@@ -2,12 +2,12 @@ local config = require("cyberdream.config")
 local util = require("cyberdream.util")
 
 local M = {}
-local cache_file = vim.fn.stdpath("cache") .. "/cyberdream_cache.json"
+local theme_cache_file = vim.fn.stdpath("cache") .. "/cyberdream_cache.json"
 
 --- build a cache file for a configured cyberdream theme
 --- @param theme table
 M.build = function(theme)
-    local cache = io.open(cache_file, "w")
+    local cache = io.open(theme_cache_file, "w")
     if not cache then
         util.notify("Failed to open cache file", "error")
         return
@@ -20,15 +20,15 @@ M.build = function(theme)
         end
     end
 
-    theme.fillchars = config.options.hide_fillchars
     theme.terminal_colors = #terminal_colors > 0 and terminal_colors or nil
+    theme.config = config.options
 
     cache:write(vim.json.encode(theme))
-    util.notify("Cache file written to " .. cache_file)
+    util.notify("Cache file written to " .. theme_cache_file)
 end
 
 M.load_options = function(theme)
-    if theme.fillchars then
+    if theme.config.hide_fillchars then
         vim.opt.fillchars:append({
             horiz = " ",
             horizup = " ",
@@ -54,7 +54,7 @@ end
 
 --- load a cache file for a configured cyberdream theme
 M.load = function()
-    local cache = io.open(cache_file, "r")
+    local cache = io.open(theme_cache_file, "r")
     if not cache then
         M.build(require("cyberdream.theme").setup())
         local notify = vim.defer_fn(function()
@@ -69,12 +69,22 @@ M.load = function()
         vim.api.nvim_set_hl(0, group, opts)
     end
 
+    -- check if config has changed
+    if not vim.deep_equal(theme.config, config.options) then
+        M.build(require("cyberdream.theme").setup())
+        local notify = vim.defer_fn(function()
+            util.notify(" Building cache...\n A restart may be required for changes to take effect.")
+            M.load()
+        end, 1000)
+        return notify
+    end
+
     M.load_options(theme)
     vim.g.colors_name = "cyberdream"
 end
 
 M.clear = function()
-    os.remove(cache_file)
+    os.remove(theme_cache_file)
     util.notify("Cache file removed")
 end