add local conf feature to confgen.lua

.config/gtk-3.0/.gitignore

@@ -1 +0,0 @@
-bookmarks

.config/i3/config.cgt

@@ -278,3 +278,4 @@ bar {
   }
 }
 
+<% opt.getDeviceConf("i3") %>

.config/touchegg/.gitignore

@@ -1 +0,0 @@
-*.lock

confgen.lua

@@ -6,3 +6,15 @@ cg.addPath ".cargo"
 for k, v in pairs(require "cg_opts") do
     cg.opt[k] = v
 end
+
+-- This function is called in templates to allow adding device-specific configs.
+cg.opt.getDeviceConf = function(id)
+    local path = os.getenv "HOME" .. "/.config/mzte_localconf/" .. id
+    local file = io.open(path, "r")
+
+    if file == nil then
+        return ""
+    end
+
+    return file:read "*a"
+end