webterm: support downloading files

For %sav and %sag blits.

pkg/arvo/mar/blit.hoon

@@ -1,6 +1,7 @@
 ::  blit: runtime blit structure
 ::
-~%  %mar-blit  ..is  ~
+/+  base64
+::
 |_  =blit:dill
 ++  grad  %noun
 ::  +grab: convert from
@@ -12,7 +13,6 @@
 ::  +grow: convert to
 ::
 ++  grow
-  ~%  %blit-grow  ..grow  ~
   |%
   ++  noun  blit
   ++  json
@@ -25,9 +25,19 @@
       %hop  (numb p.blit)
       %lin  s+(crip (tufa p.blit))
       %mor  b+&
-      %sag  (pairs 'path'^(path p.blit) 'file'^s+(jam q.blit) ~)
-      %sav  (pairs 'path'^(path p.blit) 'file'^s+q.blit ~)
       %url  s+p.blit
+    ::
+        %sag
+      %-  pairs
+      :~  'path'^(path p.blit)
+          'file'^s+(en:base64 (as-octs:mimes:html (jam q.blit)))
+      ==
+    ::
+        %sav
+      %-  pairs
+      :~  'path'^(path p.blit)
+          'file'^s+(en:base64 (as-octs:mimes:html q.blit))
+      ==
     ::
         %klr
       :-  %a

pkg/interface/package-lock.json

@@ -4876,6 +4876,11 @@
         }
       }
     },
+    "file-saver": {
+      "version": "2.0.2",
+      "resolved": "https://registry.npmjs.org/file-saver/-/file-saver-2.0.2.tgz",
+      "integrity": "sha512-Wz3c3XQ5xroCxd1G8b7yL0Ehkf0TC9oYC6buPFkNnU9EnaPlifeAFCyCh+iewXTyFRcg0a6j3J7FmJsIhlhBdw=="
+    },
     "file-uri-to-path": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/file-uri-to-path/-/file-uri-to-path-1.0.0.tgz",

pkg/interface/package.json

@@ -15,6 +15,7 @@
     "classnames": "^2.2.6",
     "codemirror": "^5.55.0",
     "css-loader": "^3.5.3",
+    "file-saver": "^2.0.2",
     "formik": "^2.1.4",
     "lodash": "^4.17.15",
     "markdown-to-jsx": "^6.11.4",

pkg/interface/src/views/apps/dojo/store.js

@@ -1,4 +1,5 @@
-import Share from './components/lib/sole';
+import { saveAs } from 'file-saver';
+
 export default class Store {
   constructor() {
     this.state = this.initialState();
@@ -42,7 +43,14 @@ export default class Store {
         this.state.lines.push('');
         this.setState({ lines: this.state.lines });
         break;
-      //TODO  file downloads for %sag and %sav
+      case 'sag':
+        blit.sav = blit.sag;
+      case 'sav':
+        let name = blit.sav.path.split('/').slice(-2).join('.');
+        let buff = new Buffer(blit.sav.file, 'base64');
+        let blob = new Blob([buff], {type: 'application/octet-stream'});
+        saveAs(blob, name);
+        break;
       case 'url':
         //TODO  too invasive? just print as <a>?
         window.open(blit.url);