diff --git a/py3status/modules/external_script.py b/py3status/modules/external_script.py
index 21a8f385a3..3d2a5ba427 100644
--- a/py3status/modules/external_script.py
+++ b/py3status/modules/external_script.py
@@ -15,21 +15,68 @@
     format: see placeholders below (default '{output}')
     localize: should script output be localized (if available)
         (default True)
+    notifications: specify a nested dict to send a notification if matched
+        against the keys, see ``Notifications`` section for more information
+        (default {})
     script_path: script you want to show output of (compulsory)
         (default None)
     strip_output: shall we strip leading and trailing spaces from output
         (default False)
 
 Format placeholders:
-    {output} output of script given by "script_path"
+    {line} number of lines in the output
+    {output} first line of the output of script given by "script_path"
+    {output_full} full output of script given by "script_path"
 
-i3status.conf example:
+Notifications:
+    Specify a nested dictionary of notification states and options to use.
 
+    Notification states:
+        'changed': display a notification only if it is changed
+        'click': display a notification of last output on click
+        'current': display a current notification regardless
+
+    Notification options:
+        'title': notification title
+        'msg': notification message
+        'level': must be 'info', 'error' or 'warning'.
+        'rate_limit': time period in seconds not to be repeated
+        'icon': must be an icon path or icon name.
+
+        You can add `format` placeholders in `msg` and `title`.
+        The `msg` and `title` options will also be formatted.
+
+Examples:
 ```
+# add a script
 external_script {
     format = "my name is {output}"
     script_path = "/usr/bin/whoami"
 }
+
+# display changed notifications, same output means no notification
+external_script {
+    notifications = {'changed': {'msg': '{output}'}}
+    script_path = "~/my_script.py"
+}
+
+# display current notifications, no output means no notification
+external_script {
+    notifications = {'current': {'msg': '{output}'}}
+    script_path = "~/my_script.py"
+}
+
+# display current notification only if output have more than 20 lines
+external_script {
+    notifications = {'current': {'msg': '\?if=line>20 {output}'}}
+    script_path = "~/my_script.py"
+}
+
+# display a notification of last full output on click
+external_script {
+    notifications = {'click': {'msg': '{output_full}'}}
+    script_path = "~/my_script.py"
+}
 ```
 
 @author frimdo ztracenastopa@centrum.cz
@@ -52,6 +99,7 @@ class Py3status:
     cache_timeout = 15
     format = '{output}'
     localize = True
+    notifications = {}
     script_path = None
     strip_output = False
 
@@ -59,13 +107,47 @@ def post_config_hook(self):
         if not self.script_path:
             raise Exception(STRING_ERROR)
 
+        self.button_refresh = 2
+        self.notification = {'normal': [], 'click': False}
+        if self.notifications:
+            for x in ['changed', 'click', 'current']:
+                self.notification[x] = self.notifications.get(x, False)
+                if self.notification[x]:
+                    if x in ['changed', 'current']:
+                        self.notification['normal'].append(x)
+            self.last_changed = self.py3.storage_get('changed')
+
+    def _get_notification(self, state):
+        temporary = self.notification[state].copy()
+        for x in ['title', 'msg']:
+            if x in temporary:
+                temporary[x] = self.py3.get_composite_string(
+                    self.py3.safe_format(temporary[x], self.script_data)
+                )
+        return temporary
+
+    def _notify_user(self, state=None):
+        if state is None:
+            if self.notification['changed']:
+                changed = self._get_notification('changed')
+                if changed != self.last_changed:
+                    self.last_changed = changed
+                    self.py3.storage_set('changed', changed)
+                    self.py3.notify_user(**changed)
+            if self.notification['current']:
+                self.py3.notify_user(**self._get_notification('current'))
+        elif state == 'click':
+            self.py3.notify_user(**self._get_notification('click'))
+
     def external_script(self):
         output_lines = None
         response = {}
         response['cached_until'] = self.py3.time_in(self.cache_timeout)
         try:
-            output = self.py3.command_output(self.script_path, shell=True, localized=self.localize)
-            output_lines = output.splitlines()
+            output_full = self.py3.command_output(
+                self.script_path, shell=True, localized=self.localize
+            )
+            output_lines = output_full.splitlines()
             if len(output_lines) > 1:
                 output_color = output_lines[1]
                 if re.search(r'^#[0-9a-fA-F]{6}$', output_color):
@@ -96,10 +178,28 @@ def external_script(self):
         else:
             output = ''
 
+        self.script_data = {
+            'line': len(output_lines),
+            'output': output,
+            'output_full': ' '.join(output_full.splitlines())
+        }
         response['full_text'] = self.py3.safe_format(
-            self.format, {'output': output})
+            self.format, self.script_data
+        )
+
+        self.script_data['output_full'] = output_full
+        if self.notification['normal']:
+            self._notify_user()
+
         return response
 
+    def on_click(self, event):
+        button = event["button"]
+        if button != self.button_refresh:
+            if self.notification['click']:
+                self._notify_user('click')
+            self.py3.prevent_refresh()
+
 
 if __name__ == "__main__":
     """