add pre-commit; add line-count functions & badge

develop.py

@@ -0,0 +1,34 @@
+"""Devloper functions."""
+
+import os
+
+
+def count_lines(directory):
+    """Count lines of code.
+
+    Arguments:
+        directory {str} -- Path to count
+
+    Returns:
+        {int} -- Line count
+    """
+    lines = 0
+    excluded = ("\n",)
+    for thing in os.listdir(directory):
+        thing = os.path.join(directory, thing)
+        if os.path.isfile(thing):
+            if thing.endswith(".py"):
+                with open(thing, "r") as f:
+                    readlines = [
+                        line
+                        for line in f.readlines()
+                        if line not in excluded and not line.startswith("#")
+                    ]
+                    lines += len(readlines)
+
+    for thing in os.listdir(directory):
+        thing = os.path.join(directory, thing)
+        if os.path.isdir(thing):
+            lines += count_lines(thing)
+
+    return lines