Use pre-commit

[pre-commit](https://pre-commit.com/) automatically runs tools like
linters and fixers to make development easier. This change adds a simple
pre-commit config file with an example trailing whitespace fixer and
applies it to the existing project.

Additionally, don't ignore the lib directory (an error introduced in #8).

.gitignore

@@ -26,7 +26,8 @@ dist/
 downloads/
 eggs/
 .eggs/
-lib/
+# pyShelf uses its own `lib` directory, don't ignore it.
+# lib/
 lib64/
 parts/
 sdist/

.pre-commit-config.yaml

@@ -0,0 +1,12 @@
+repos:
+  # Meta housekeeping to keep pre-commit operating correctly
+  - repo: meta
+    hooks:
+      - id: check-hooks-apply
+      - id: check-useless-excludes
+
+  # General housekeeping and auto-fixers
+  - repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v1.3.0
+    hooks:
+      - id: trailing-whitespace

README.md

@@ -10,9 +10,16 @@ Calibre does have a console based server solution, However there is currently no
 Thus I am creating pyShelf and I hope to be able to provide all the functionality required to organize and host all your ebooks.
 
 I am open to and hoping for community help in the design and execution of this program.
+
+## Development
+pyShelf uses [`pre-commit`](https://pre-commit.com/) to automate some tasks.
+Before developing, run `pre-commit install`.
+See the [documentation](https://pre-commit.com/) for more information.
+
 ## Configuration
 All configuration is done in config.py.
 The only currently required configuration is to set book_path to the location of your books.
+
 ## Current Features
 Currently pyShelf will recursively scan your collection, extract and store some metadata in the sqlite database.
 The basic template system is in place, as well as a template mockup. This can be seen hosted on port 8000