Add git churn and what-the-hell-just-happened

Files copied from https://github.com/garybernhardt/dotfiles.git

bin/git-churn

@@ -0,0 +1,23 @@
+#!/bin/bash
+#
+# Written by Corey Haines
+# Scriptified by Gary Bernhardt
+#
+# Put this anywhere on your $PATH (~/bin is recommended). Then git will see it
+# and you'll be able to do `git churn`.
+#
+# Show churn for whole repo:
+#   $ git churn
+#
+# Show churn for specific directories:
+#   $ git churn app lib
+#
+# Show churn for a time range:
+#   $ git churn --since='1 month ago'
+#
+# (These are all standard arguments to `git log`.)
+
+set -e
+git log --all -M -C --name-only --format='format:' "$@" | sort | grep -v '^$' | uniq -c | sort -n | awk 'BEGIN {print "count\tfile"} {print $1 "\t" $2}'
+
+

bin/git-what-the-hell-just-happened

@@ -0,0 +1,21 @@
+#!/bin/bash
+set -e
+
+ref=${1:-"HEAD"}
+
+old=$ref@{1}
+new=$ref
+
+log() {
+    git log --graph --pretty=short -1 $1
+}
+
+echo "Old revision:"
+log $old
+echo
+echo "New revision:"
+log $new
+echo
+echo "Changes:"
+git diff --stat --summary $new $old
+