Check presentation file or folder existance. (#212)

* Add videos on README as per #188

* Fix video preview on README

* #211 Add pre-check when firing hovercraft command for existance of presentation argument.

CHANGES.txt

@@ -4,7 +4,8 @@ Changes
 2.7beta2 (unreleased)
 ---------------------
 
-- Nothing changed yet.
+- Added the pre-check for file or folder existance when serving or
+creating the presentation.
 
 
 2.7beta1 (2019-11-06)

CONTRIBUTORS.txt

@@ -72,4 +72,6 @@ Other contributors (see CHANGES.txt for details):
 
 * Dan Jacka [danjacka]
 
+* Juan Biondi [yeyeto2788]
+
 .. _impress.js: http://github.com/bartaz/impress.js

README.rst

@@ -30,10 +30,22 @@ Installation
 ------------
 
 Hovercraft requires Python 3 and can be installed like any Python package.
+
 The easiest way is to install pip_, and then run::
 
     $ pip3 install hovercraft
 
+* Installation on Ubuntu and Debian based computers:
+
+.. image:: https://img.youtube.com/vi/tHSJLF9OnKQ/0.jpg
+   :target: https://www.youtube.com/watch?v=tHSJLF9OnKQ
+
+* Installation on Windows:
+
+.. image:: https://img.youtube.com/vi/I63I8Az24d8/0.jpg
+   :target: https://www.youtube.com/watch?v=I63I8Az24d8
+
+
 Hovercraft is untested on Windows, but there is no reason it shouldn't work, at least in theory.
 
 

hovercraft/__init__.py

@@ -186,6 +186,11 @@ def my_gettext(s):
 
 def serve_presentation(args):
 
+    # Check whether the file or folder as input exists.
+    if not os.path.exists(os.path.abspath(args.presentation)):
+        print(f"File or folder '{args.presentation}' does not exists.")
+        exit(-1)
+
     # XXX Bit of a hack, clean this up, I check for this twice, also in the template.
     if args.template and args.template not in ("simple", "default"):
         args.template = os.path.abspath(args.template)