make the listen path fully costumizable

.env.example

@@ -1,2 +1,3 @@
 DATABASE_URL=sqlite3://./crystalgauntlet.db
-PORT=8080
+# can either be http:// or unix:// for a unix socket
+LISTEN_ON=http://127.0.0.1:8080

config.toml.example

@@ -7,7 +7,8 @@
 #
 # example:
 #   boomlings.com/database/
-#   exampke.com/aaaaaaaaaa/
+#   example.com/aaaaaaaaaa/
+#               ^^^^^^^^^^^
 #
 # leaving blank will disable this
 append_path = ""

src/crystal-gauntlet.cr

@@ -62,8 +62,17 @@ module CrystalGauntlet
       end
     end
 
-    puts "Listening on http://127.0.0.1:8080"
-    server.listen(8080)
+    listen_on = URI.parse(ENV["LISTEN_ON"]? || "http://localhost:8080").normalize
+
+    case listen_on.scheme
+    when "http"
+      server.bind_tcp(listen_on.hostname.not_nil!, listen_on.port.not_nil!)
+    when "unix"
+      server.bind_unix(listen_on.to_s.sub("unix://",""))
+    end
+
+    puts "Listening on #{listen_on.to_s}"
+    server.listen
   end
 end