add requirements.txt

Also install requirements in .travis.yml.

By the way, I explored ways to install Pandoc in a Travis container
environment (without sudo), but that's just too hard. Giving up.

3 files changed, 9 insertions, 3 deletions

diff --git a/.travis.yml b/.travis.yml
index 96f8425c..f47eb57b 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,11 +1,13 @@
 branches:
-  only:
-    - source
+  except:
+    - master
 language: python
 python:
   - "3.4"
 before_install:
   - sudo apt-get update
   - sudo apt-get install pandoc
+install:
+  - pip install -r requirements.txt
 script:
   - python pyblog generate
diff --git a/pyblog b/pyblog
index 5f318258..f993172d 100755
--- a/pyblog
+++ b/pyblog
@@ -810,7 +810,8 @@ def main():
     """CLI interface."""
     description = "Simple blog generator in Python with Pandoc as backend."
     parser = argparse.ArgumentParser(description=description)
-    subparsers = parser.add_subparsers()
+    subparsers = parser.add_subparsers(dest="action")
+    subparsers.required = True
 
     parser_new_post = subparsers.add_parser(
         "new_post", aliases=["n", "new"],
diff --git a/requirements.txt b/requirements.txt
new file mode 100644
index 00000000..0d6bc62b
--- /dev/null
+++ b/requirements.txt
@@ -0,0 +1,3 @@
+beautifulsoup4
+colorama
+python-dateutil