git: add lazy checkin scripts

.mgr_config/bin/git-lazy-description

@@ -0,0 +1,19 @@
+#!/bin/bash
+
+diffstat="$(git diff --staged --numstat | awk '{print ($1 + $2), $3}' | sort -k1nr)"
+count=$(echo "$diffstat" | wc -l)
+if [[ -z "$diffstat" ]]; then
+    echo "No staged changes to describe" >&2
+    exit 1
+fi
+
+file=$(echo "$diffstat" | head -n1 | cut -f2 -d' ')
+
+if [[ $count -eq 1 ]]; then
+    echo "Update $file"
+elif [[ $count -gt 1 ]]; then
+    echo "Update \`$file\` and $((count - 1)) other files"
+fi
+
+
+exit 0