create command for uploading current selected text as file

Slack.py

@@ -124,7 +124,6 @@ def send_messages(self, index):
             })
         loading.done = True
 
-
     def init_message_send(self):
         # check is channels are cached in memory
         receivers = []
@@ -314,6 +313,46 @@ def friendly_filename(self):
         return filename
 
 
+class UploadSelectionAsFileCommand(UploadCurrentFileCommand):
+    """ Uploads current selected text as file """
+
+    def run(self, view):
+        super(UploadCurrentFileCommand, self).run(view)
+
+        self.file = self.view.file_name()
+        if not self.file:
+            return sublime.error_message('SLACK: No file open')
+
+        # get all selected regions
+        for region in self.view.sel():
+            text = self.view.substr(region)
+
+            if not text:
+                sublime.error_message("SLACK Error: No text selected")
+                return
+            self.messages.append(text)
+
+        threading.Thread(target=self.init_message_send).start()
+
+    def upload_file(self, receiver_index):
+
+        receiver = self.receivers[receiver_index]
+        loading = Loader('Uploading file ...', False)
+
+        for content in self.messages:
+
+            self._api_call(API_UPLOAD_FILES, {
+                'token': receiver.get('token'),
+                'channels': receiver.get('id'),
+                'filename': self.friendly_filename(),
+                'content': content
+            }, loading=loading)
+
+        loading.done = True
+        sublime.status_message('Selection uploaded successfully!')
+        self.file = None
+
+
 class UploadFromPathCommand(UploadCurrentFileCommand):
     def run(self, view):
         self.settings = sublime.load_settings("Slack.sublime-settings")