Add the cowsay plugin

plugins/cowsay.py

@@ -0,0 +1,42 @@
+# cowsay.py
+# Necessary plugin for productive Slack orgs.
+# Eryn Wells <eryn@erynwells.me>
+
+import logging
+import re
+import subprocess
+
+LOGGER = logging.getLogger('cowsay')
+
+COWSAY_PATH = '/usr/games/cowsay'
+MESSAGE_RE = re.compile(r'(!cowsay)(.*)')
+
+outputs = []
+
+def process_message(data):
+    try:
+        text = data['text']
+    except KeyError:
+        LOGGER.error('Missing "text" key in data.')
+        return
+
+    # find the message
+    match = MESSAGE_RE.match(text)
+    if not match:
+        return
+    cmd = match.group(1)
+    if not cmd:
+        return
+    msg = match.group(2)
+    if not msg:
+        LOGGER.info('Cowsay command but no message.')
+
+    # cowsay it up
+    try:
+        out = subprocess.check_output([COWSAY_PATH, msg]).decode()
+    except subprocess.CalledProcessError as e:
+        LOGGER.error('Error running cowsay. (%d)', e.returncode)
+        return
+    out = '```\n{}```'.format(out)
+    outputs.append([data['channel'], out])
+