Bring React into the tree, and add linting and bundling framework for the JS etc.

web/pgadmin/utils/javascript/javascript_bundler.py

@@ -0,0 +1,62 @@
+##########################################################################
+#
+# pgAdmin 4 - PostgreSQL Tools
+#
+# Copyright (C) 2013 - 2017, The pgAdmin Development Team
+# This software is released under the PostgreSQL Licence
+#
+##########################################################################
+
+import os
+from contextlib import contextmanager
+from subprocess import call
+from pgadmin.utils import u, fs_encoding, file_quote
+
+
+# enum-like for tracking whether we have
+class JsState:
+    NONE = 0
+    OLD = 1
+    NEW = 2
+
+
+class JavascriptBundler:
+    """Builds Javascript bundle files by delegating to webpack"""
+
+    def __init__(self):
+        self.jsState = JsState.NONE
+
+    def bundle(self):
+        try:
+            try_building_js()
+            self.jsState = JsState.NEW
+        except OSError:
+            webdir_path()
+            generatedJavascriptDir = os.path.join(webdir_path(), 'pgadmin', 'static', 'js', 'generated')
+            if os.path.exists(generatedJavascriptDir) and os.listdir(generatedJavascriptDir):
+                self.jsState = JsState.OLD
+            else:
+                self.jsState = JsState.NONE
+
+    def report(self):
+        return self.jsState
+
+
+@contextmanager
+def pushd(new_dir):
+    previous_dir = os.getcwd()
+    os.chdir(new_dir)
+    yield
+    os.chdir(previous_dir)
+
+
+def webdir_path():
+    dirname = os.path.dirname
+    thisPath = os.path.realpath(u(__file__, fs_encoding))
+    return dirname(dirname(dirname(dirname(thisPath))))
+
+
+def try_building_js():
+    with pushd(webdir_path()):
+        if call(['yarn', 'run', 'bundle']) != 0:
+            raise OSError('Error executing bundling the application')