Add basic example

Author: ryanmcdermott

devserver/BUILD

@@ -1,8 +1,11 @@
-cc_binary(
+filegroup(
+    name = "httplib",
+    srcs = glob(["httplib/httplib.h"]),
+    visibility = ["//visibility:public"]
+)
+
+filegroup(
     name = "main",
-    srcs = [
-        "main.cc", 
-        "httplib/httplib.h"
-    ],
-    linkopts = ["-lpthread"],
+    srcs = glob(["main.cc"]),
+    visibility = ["//visibility:public"],
 )

devserver/defs.bzl

@@ -1,33 +1,9 @@
-def _impl(ctx):
-    executable = ctx.actions.declare_file(ctx.attr.name)
-
-    args = ctx.actions.args()
-    args.add("-o", executable)
-    args.add_all(ctx.files.srcs)
-
-    ctx.actions.run(
-        inputs = ctx.files.srcs,
-        outputs = [executable],
-        # This is for demo purposes.  In a real Bazel rule you'd
-        # want to use cc_common.
-        executable = "/usr/bin/gcc",
-        arguments = [args],
+def devserver(name, port):
+    native.cc_binary(
+        name = name,
+        srcs = [
+            Label("@rules_devserver//devserver:main"), 
+            Label("@rules_devserver//devserver:httplib")
+        ],
+        linkopts = ["-lpthread"],
     )
-    
-    return [
-        DefaultInfo(
-            executable = executable,
-            files = depset([executable]),
-        ),
-    ]
-
-my_cc_binary = rule(
-    implementation = _impl,
-    attrs = {
-        "srcs": attr.label_list(
-            mandatory = True,
-            allow_files = True,
-        ),
-    },
-    executable = True,
-)

examples/BUILD

@@ -0,0 +1,6 @@
+load("//devserver:defs.bzl", "devserver")
+
+devserver(
+    name = "serve",
+    port = 8080,
+)