Module for fetching and displays exchange rates with EXMO (#600)

* Module for fetching and displays exchange rates with EXMO

* Fix bug with default value for pair settings

* Handle error with fetching data

i3pystatus/exmo.py

@@ -0,0 +1,102 @@
+# -*- coding: utf-8 -*-
+
+import requests
+
+from i3pystatus import IntervalModule, formatp
+from i3pystatus.core.util import internet, require, user_open
+
+
+class Exmo(IntervalModule):
+    """
+    This module fetching and displays exchange rates with EXMO.
+    Using API <https://exmo.me/en/api>.
+
+    .. rubric:: Available formatters
+
+    * {buy_price}
+    * {status}
+    * {pair}
+
+    """
+
+    settings = (
+        ('format', 'Format string used for output'),
+        ('pair', 'Currency pair for display on output'),
+        ('color', 'Standard color'),
+        ('colorize', 'Enable color change on price increase/decrease'),
+        ('color_up', 'Color for price increases'),
+        ('color_down', 'Color for price decreases'),
+        ('interval', 'Update interval.'),
+        'status'
+    )
+    format = '{buy_price}[ {status}] {pair}'
+    pair = 'BTC_USD'
+    color = '#FFFFFF'
+    colorize = False
+    color_up = '#00FF00'
+    color_down = '#FF0000'
+    interval = 60
+    status = {
+        'price_up': '▲',
+        'price_down': '▼',
+    }
+
+    _prev_price = 0
+    _prev_status = ''
+    _prev_color = '#FFFFFF'
+
+    def __init__(self, *args, **kwargs):
+        super(Exmo, self).__init__(*args, **kwargs)
+        self.on_leftclick = [
+            'open_something',
+            'https://exmo.me/ru/trade#?pair={}'.format(self.pair)
+        ]
+
+    def fetch_data(self):
+        response = requests.get('https://api.exmo.com/v1/ticker/')
+        return response.json()
+
+    @require(internet)
+    def run(self):
+        try:
+            price_data = self.fetch_data().get(self.pair)
+        except Exception as e:
+            self.output = {
+                'full_text': 'Failed fetching data from server: ' + str(e),
+                'color': '#FF0000'
+            }
+            return
+        fdict = {
+            'pair': self.pair.replace('_', '/'),
+            'buy_price': price_data.get('buy_price', 0),
+            'status': ''
+        }
+        color = self.color
+
+        if self._prev_price and fdict['buy_price'] > self._prev_price:
+            color = self.color_up
+            fdict['status'] = self.status['price_up']
+        elif self._prev_price and fdict['buy_price'] < self._prev_price:
+            color = self.color_down
+            fdict['status'] = self.status['price_down']
+        else:
+            color = self._prev_color
+            fdict['status'] = self._prev_status
+
+        self._prev_price = price_data.get('buy_price', 0)
+        self._prev_status = fdict['status']
+        self._prev_color = color
+
+        if not self.colorize:
+            color = self.color
+
+        self.output = {
+            'full_text': formatp(self.format, **fdict).strip(),
+            'color': color
+        }
+
+    def open_something(self, url_or_command):
+        """
+        Wrapper function, to pass the arguments to user_open
+        """
+        user_open(url_or_command)