Add deno2 prototype from external repo.

deno2/tools/build.py

@@ -0,0 +1,67 @@
+#!/usr/bin/env python
+# Get Depot Tools and make sure it's in your path.
+# http://commondatastorage.googleapis.com/chrome-infra-docs/flat/depot_tools/docs/html/depot_tools_tutorial.html#_setting_up
+# Use .gclient to modify the deps.
+import os
+import sys
+import subprocess
+import argparse
+
+TARGET = "deno"
+
+parser = argparse.ArgumentParser(description="build.py")
+parser.add_argument('--debug', dest='debug', action='store_true')
+parser.add_argument('--use_ccache', dest='use_ccache', action='store_true')
+parser.add_argument('--sync', dest='sync', action='store_true')
+parser.set_defaults(debug=False, use_ccache=False, sync=False)
+args = parser.parse_args()
+
+root_path = os.path.dirname(os.path.dirname(os.path.realpath(__file__)))
+
+
+def main():
+    os.chdir(root_path)
+    buildName = "Debug" if args.debug else "Default"
+    buildDir = os.path.join(root_path, "out", buildName)
+    # Run sync if any of the dep dirs don't exist.
+    # Or the user supplied the --sync flag.
+    if args.sync or dirsMissing():
+        run(["gclient", "sync", "--no-history"])
+
+    # Run gn gen out/Default if out doesn't exist.
+    if not os.path.exists(buildDir):
+        gn_gen = ["gn", "gen", buildDir]
+        gn_args = []
+        if args.debug:
+            gn_args.append("is_debug=true")
+        if args.use_ccache:
+            gn_args.append("cc_wrapper=\"ccache\"")
+        if len(gn_args) > 0:
+            gn_gen += ["--args=%s" % " ".join(gn_args)]
+        run(gn_gen)
+
+    # Always run ninja.
+    run(["ninja", "-C", buildDir, TARGET])
+
+
+def run(args):
+    print " ".join(args)
+    env = os.environ.copy()
+    subprocess.check_call(args, env=env)
+
+
+def dirsMissing():
+    dirsToLoad = [
+        "v8",
+        "third_party/protobuf",
+        "tools/protoc_wrapper",
+        "third_party/zlib",
+    ]
+    for d in dirsToLoad:
+        if not os.path.exists(d):
+            return True
+    return False
+
+
+if '__main__' == __name__:
+    main()