Add port parsing

Author: ryanmcdermott

devserver/defs.bzl

@@ -5,5 +5,6 @@ def devserver(name, port):
             Label("@rules_devserver//devserver:main"), 
             Label("@rules_devserver//devserver:httplib")
         ],
+        args = ["--port=%d" % port],
         linkopts = ["-lpthread"],
     )

devserver/main.cc

@@ -2,10 +2,17 @@
 
 int main(int argc, char **argv) {
   httplib::Server svr;
+  std::string port = "8080";
+
+  for (int i = 0; i < argc; i++) {
+    if (std::string(argv[i]).rfind("--port", 0) != std::string::npos) {
+      port = std::string(argv[i]).substr(7);
+    }
+  }
 
   svr.Get("/", [](const httplib::Request &req, httplib::Response &res) {
-    res.set_content("Hello World!", "text/plain");
+    res.set_content("Hello World!", "text/html");
   });
 
-  svr.listen("localhost", 8080);
+  svr.listen("localhost", std::stoi(port));
 }

examples/BUILD

@@ -2,5 +2,5 @@ load("//devserver:defs.bzl", "devserver")
 
 devserver(
     name = "serve",
-    port = 8080,
+    port = 8081,
 )