zulip_bots setup.py: Install deps from the bots' requirements.txt files.

This makes it straightforward to add dependencies for a bot,
and works around pypa/pip#4957.

zulip_bots/setup.py

@@ -10,6 +10,8 @@
 
 import generate_manifest
 
+from zulip_bots import provision
+
 ZULIP_BOTS_VERSION = "0.3.9"
 IS_PYPA_PACKAGE = False
 
@@ -48,15 +50,6 @@
 setuptools_info = dict(
     install_requires=[
         'zulip',
-        'mock>=2.0.0',
-        'html2text',  # for bots/define
-        'BeautifulSoup4',  # for bots/googlesearch
-        'lxml',  # for bots/googlesearch
-        'requests',  # for bots/link_shortener and bots/jira
-        'python-chess[engine,gaviota]',  # for bots/chess
-        'wit',  # for bots/witai
-        'apiai',  # for bots/dialogflow
-        'simple_salesforce'  # for bots/salesforce
     ],
 )
 
@@ -98,5 +91,9 @@ def check_dependency_manually(module_name, version=None):
             package_list.append('zulip_bots.bots.' + dir_name)
     package_info['packages'] = package_list
 
+# Install all requirements for all bots.
+bot_paths = provision.get_bot_paths()
+for bot_path in bot_paths:
+    provision.provision_bot(path_to_bot=bot_path, force=False)
 
 setup(**package_info)

zulip_bots/zulip_bots/provision.py

@@ -10,6 +10,13 @@
 import pip
 from typing import Iterator
 
+def get_bot_paths():
+    current_dir = os.path.dirname(os.path.abspath(__file__))
+    bots_dir = os.path.join(current_dir, "bots")
+    bots_subdirs = map(lambda d: os.path.abspath(d), glob.glob(bots_dir + '/*'))
+    paths = filter(lambda d: os.path.isdir(d), bots_subdirs)
+    return paths
+
 def provision_bot(path_to_bot, force):
     # type: (str, bool) -> None
     req_path = os.path.join(path_to_bot, 'requirements.txt')
@@ -66,12 +73,7 @@ def parse_args(available_bots):
 
 def main():
     # type: () -> None
-    current_dir = os.path.dirname(os.path.abspath(__file__))
-    bots_dir = os.path.join(current_dir, "bots")
-    bots_subdirs = map(lambda d: os.path.abspath(d), glob.glob(bots_dir + '/*'))
-    available_bots = filter(lambda d: os.path.isdir(d), bots_subdirs)
-
-    options = parse_args(available_bots)
+    options = parse_args(available_bots=get_bot_paths())
 
     if not options.quiet:
         logging.basicConfig(stream=sys.stdout, level=logging.INFO)