net.http: support v -http -d http_folder=vlib/_docs (allow customizing the folder, port, and index file through CLI arguments to v -http)

Author: spytheman

vlib/net/http/file/static_server.v

@@ -11,11 +11,11 @@ import net.urllib
 @[params]
 pub struct StaticServeParams {
 pub mut:
-	folder         string        = '.'              // the folder, that will be used as a base for serving all static resources; If it was /tmp, then: http://localhost:4001/x.txt => /tmp/x.txt
-	index_file     string        = 'index.html'     // A request for http://localhost:4001/ will map to index.html, if that file is present.
-	auto_index     bool          = true             // when an index_file is *not* present, a request for http://localhost:4001/ will list automatically all files in the folder.
-	filter_myexe   bool          = true             // whether to filter the name of the static file executable from the automatic folder listings for / . Useful with `v -e 'import net.http.file; file.serve()'`
-	on             string        = 'localhost:4001' // on which address:port to listen for http requests
+	folder         string        = $d('http_folder', '.')              // The folder, that will be used as a base for serving all static resources; If it was /tmp, then: http://localhost:4001/x.txt => /tmp/x.txt . Customize with `-d http_folder=vlib/_docs`.
+	index_file     string        = $d('http_index_file', 'index.html') // A request for http://localhost:4001/ will map to `index.html`, if that file is present.
+	auto_index     bool          = $d('http_auto_index', true)         // when an index_file is *not* present, a request for http://localhost:4001/ will list automatically all files in the folder.
+	on             string        = $d('http_on', 'localhost:4001')     // on which address:port to listen for http requests.
+	filter_myexe   bool          = true // whether to filter the name of the static file executable from the automatic folder listings for / . Useful with `v -e 'import net.http.file; file.serve()'`
 	workers        int           = runtime.nr_jobs() // how many worker threads to use for serving the responses, by default it is limited to the number of available cores; can be controlled with setting VJOBS
 	shutdown_after time.Duration = time.infinite // after this time has passed, the webserver will gracefully shutdown on its own
 }