(core) move client code to core

Summary:
This moves all client code to core, and makes minimal fix-ups to
get grist and grist-core to compile correctly.  The client works
in core, but I'm leaving clean-up around the build and bundles to
follow-up.

Test Plan: existing tests pass; server-dev bundle looks sane

Reviewers: dsagal

Reviewed By: dsagal

Differential Revision: https://phab.getgrist.com/D2627

app/client/widgets/DateTextBox.js

@@ -0,0 +1,89 @@
+var _ = require('underscore');
+var ko = require('knockout');
+var dom = require('../lib/dom');
+var dispose = require('../lib/dispose');
+var kd = require('../lib/koDom');
+var kf = require('../lib/koForm');
+var AbstractWidget = require('./AbstractWidget');
+
+const {fromKoSave} = require('app/client/lib/fromKoSave');
+const {alignmentSelect} = require('app/client/ui2018/buttonSelect');
+const {cssRow} = require('app/client/ui/RightPanel');
+
+/**
+ * DateTextBox - The most basic widget for displaying simple date information.
+ */
+function DateTextBox(field) {
+  AbstractWidget.call(this, field);
+
+  this.alignment = this.options.prop('alignment');
+  this.dateFormat = this.options.prop('dateFormat');
+  this.isCustomDateFormat = this.options.prop('isCustomDateFormat');
+
+  this.dateFormatOptions = [
+    'YYYY-MM-DD',
+    'MM-DD-YYYY',
+    'MM/DD/YYYY',
+    'MM-DD-YY',
+    'MM/DD/YY',
+    'DD MMM YYYY',
+    'MMMM Do, YYYY',
+    'DD-MM-YYYY',
+    'Custom'
+  ];
+
+  // Helper to set 'dateFormat' and 'isCustomDateFormat' from the set of default date format strings.
+  this.standardDateFormat = this.autoDispose(ko.computed({
+    owner: this,
+    read: function() { return this.isCustomDateFormat() ? 'Custom' : this.dateFormat(); },
+    write: function(val) {
+      if (val === 'Custom') { this.isCustomDateFormat.setAndSave(true); }
+      else {
+        this.options.update({isCustomDateFormat: false, dateFormat: val});
+        this.options.save();
+      }
+    }
+  }));
+
+  // An observable that always returns `UTC`, eases DateTimeEditor inheritance.
+  this.timezone = ko.observable('UTC');
+}
+dispose.makeDisposable(DateTextBox);
+_.extend(DateTextBox.prototype, AbstractWidget.prototype);
+
+DateTextBox.prototype.buildDateConfigDom = function() {
+  var self = this;
+  return dom('div',
+    kf.row(
+      1, dom('div.glyphicon.glyphicon-calendar.config_icon'),
+      8, kf.label('Date Format'),
+      9, dom(kf.select(self.standardDateFormat, self.dateFormatOptions), dom.testId("Widget_dateFormat"))
+    ),
+    kd.maybe(self.isCustomDateFormat, function() {
+      return dom(kf.text(self.dateFormat), dom.testId("Widget_dateCustomFormat"));
+    })
+  );
+};
+
+DateTextBox.prototype.buildConfigDom = function() {
+  return dom('div',
+    this.buildDateConfigDom(),
+    cssRow(
+      alignmentSelect(fromKoSave(this.alignment))
+    )
+  );
+};
+
+DateTextBox.prototype.buildTransformConfigDom = function() {
+  return this.buildDateConfigDom();
+};
+
+DateTextBox.prototype.buildDom = function(row) {
+  let value = row[this.field.colId()];
+  return dom('div.field_clip',
+    kd.style('text-align', this.alignment),
+    kd.text(() => row._isAddRow() ? '' : this.valueFormatter().format(value()))
+  );
+};
+
+module.exports = DateTextBox;