Ability to switch file source field in posting form

boards/locale/ru/LC_MESSAGES/django.po

@@ -533,3 +533,6 b' msgstr "\xd0\x9c\xd0\xbe\xd0\xbd\xd0\xbe\xd1\x85\xd1\x80\xd0\xbe\xd0\xbc\xd0\xbd\xd1\x8b\xd0\xb9"'
 
 msgid "Subsections: "
 msgstr "Подразделы: "
+
+msgid "Change file source"
+msgstr "Изменить источник файла"

boards/static/css/base.css

@@ -153,3 +153,4 b' textarea, input {'
     filter: grayscale(100%);
     -webkit-filter: grayscale(100%);
 }
+

boards/static/js/form.js

@@ -1,3 +1,5 b''
+var ITEM_FILE_SOURCE = 'fileSource';
+
 $('input[name=image]').wrap($('<div class="file_wrap"></div>'));
 
 $('body').on('change', 'input[name=image]', function(event) {
@@ -60,6 +62,27 b' function addHiddenInput(form, name, valu'
     form.find('input[name=' + name + ']').val(value);
 }
 
+function selectFileChoice() {
+    var file_input = $('#id_file');
+    var url_input = $('#id_file_url');
+
+    var file_input_row = file_input.parent().parent();
+    var url_input_row = url_input.parent().parent();
+
+    file_input_row.toggle();
+    url_input_row.toggle();
+    url_input.val('');
+    file_input.val('');
+
+    var source;
+    if (file_input_row.is(':visible')) {
+        source = 'file';
+    } else {
+        source = 'url';
+    }
+    localStorage.setItem(ITEM_FILE_SOURCE, source);
+}
+
 $(document).ready(function() {
     var powDifficulty = parseInt($('body').attr('data-pow-difficulty'));
     if (powDifficulty > 0) {
@@ -92,4 +115,18 b' function addHiddenInput(form, name, valu'
             return false;
         });
     }
+
+    var source = localStorage.getItem(ITEM_FILE_SOURCE);
+    if (source == null) {
+        source = 'file';
+    }
+    if (source == 'file') {
+        $('#id_file_url').parent().parent().hide();
+    } else {
+        $('#id_file').parent().parent().hide();
+    }
+
+    $('#file-source-button').click(function() {
+        selectFileChoice();
+    });
 });

boards/templates/boards/all_threads.html

@@ -163,6 +163,7 b''
                 <div class="form-submit">
                     <input type="submit" value="{% trans "Post" %}"/>
                     <button id="preview-button" onclick="return false;">{% trans 'Preview' %}</button>
+                    <button id="file-source-button" onclick="return false;">{% trans 'Change file source' %}</button>
                 </div>
             </form>
             </div>

boards/templates/boards/thread_normal.html

@@ -51,6 +51,7 b''
                         <div class="form-submit">
                             <input type="submit" value="{% trans "Post" %}"/>
                             <button id="preview-button" onclick="return false;">{% trans 'Preview' %}</button>
+                            <button id="file-source-button" onclick="return false;">{% trans 'Change file source' %}</button>
                         </div>
                     </form>
                 </div>