Cleanup dashboard JS (#491)

* Cleanup dashboard JS

* Add vscode

* Save start_mark/end_mark

* Updates

* Updates

* Remove need for cv.nameable

It's a bit hacky but removes so much bloat from integrations

* Add enum helper

* Document APIs, and Improvements

* Fixes

* Fixes

* Update PULL_REQUEST_TEMPLATE.md

* Updates

* Updates

* Updates

esphome/vscode.py

@@ -0,0 +1,72 @@
+from __future__ import print_function
+
+import json
+
+from esphome.config import load_config, _format_vol_invalid
+from esphome.core import CORE
+from esphome.py_compat import text_type, safe_input
+from esphome.yaml_util import ESPHomeDataBase
+
+
+def _get_invalid_range(res, invalid):
+    # type: (Config, vol.Invalid) -> Optional[DocumentRange]
+    obj = res.get_deepest_value_for_path(invalid.path)
+    if isinstance(obj, ESPHomeDataBase) and obj.esp_range is not None:
+        return obj.esp_range
+    return None
+
+
+def _dump_range(range):
+    # type: (Optional[DocumentRange]) -> Optional[dict]
+    if range is None:
+        return None
+    return {
+        'document': range.start_mark.document,
+        'start_line': range.start_mark.line,
+        'start_col': range.start_mark.column,
+        'end_line': range.end_mark.line,
+        'end_col': range.end_mark.column,
+    }
+
+
+class VSCodeResult(object):
+    def __init__(self):
+        self.yaml_errors = []
+        self.validation_errors = []
+
+    def dump(self):
+        return json.dumps({
+            'type': 'result',
+            'yaml_errors': self.yaml_errors,
+            'validation_errors': self.validation_errors,
+        })
+
+    def add_yaml_error(self, message):
+        self.yaml_errors.append({
+            'message': message,
+        })
+
+    def add_validation_error(self, range_, message):
+        self.validation_errors.append({
+            'range': _dump_range(range_),
+            'message': message,
+        })
+
+
+def read_config():
+    while True:
+        CORE.reset()
+        data = json.loads(safe_input())
+        assert data['type'] == 'validate'
+        CORE.vscode = True
+        CORE.config_path = data['file']
+        vs = VSCodeResult()
+        try:
+            res = load_config()
+        except Exception as err:  # pylint: disable=broad-except
+            vs.add_yaml_error(text_type(err))
+        else:
+            for err in res.errors:
+                range_ = _get_invalid_range(res, err)
+                vs.add_validation_error(range_, _format_vol_invalid(err, res))
+        print(vs.dump())