[sql lab] only show single run query button (#1858)

* only show single run query button, allow async if possible

* only pass the needed props, rather than entire objects to the component

* add simple test

* fix linting

superset/assets/javascripts/SqlLab/components/RunQueryActionButton.jsx

@@ -0,0 +1,71 @@
+import React, { PropTypes } from 'react';
+import Button from '../../components/Button';
+
+const propTypes = {
+  allowAsync: PropTypes.bool.isRequired,
+  dbId: PropTypes.number.isRequired,
+  queryState: PropTypes.string.isRequired,
+  runQuery: PropTypes.func.isRequired,
+  selectedText: PropTypes.string,
+  stopQuery: PropTypes.func.isRequired,
+};
+
+export default function RunQueryActionButton(props) {
+  const runBtnText = props.selectedText ? 'Run Selected Query' : 'Run Query';
+  const btnStyle = props.selectedText ? 'warning' : 'primary';
+  const shouldShowStopBtn = ['running', 'pending'].indexOf(props.queryState) > -1;
+  const asyncToolTip = 'Run query asynchronously';
+
+  const commonBtnProps = {
+    bsSize: 'small',
+    bsStyle: btnStyle,
+    disabled: !(props.dbId),
+  };
+
+  const syncBtn = (
+    <Button
+      {...commonBtnProps}
+      onClick={() => props.runQuery(false)}
+      key="run-btn"
+    >
+      <i className="fa fa-table" /> {runBtnText}
+    </Button>
+  );
+
+  const asyncBtn = (
+    <Button
+      {...commonBtnProps}
+      onClick={() => props.runQuery(true)}
+      key="run-async-btn"
+      tooltip={asyncToolTip}
+    >
+      <i className="fa fa-table" /> {runBtnText}
+    </Button>
+  );
+
+  const stopBtn = (
+    <Button
+      {...commonBtnProps}
+      onClick={props.stopQuery}
+    >
+      <i className="fa fa-stop" /> Stop
+    </Button>
+  );
+
+  let button;
+  if (shouldShowStopBtn) {
+    button = stopBtn;
+  } else if (props.allowAsync) {
+    button = asyncBtn;
+  } else {
+    button = syncBtn;
+  }
+
+  return (
+    <div className="inline m-r-5 pull-left">
+      {button}
+    </div>
+  );
+}
+
+RunQueryActionButton.propTypes = propTypes;