sort git diff --stat by total number of lines changed (now with color!) (credit to jakub-g with the original solution: https://gist.github.com/jakub-g/7599177)

git-diff-stat-sort.sh

#!/usr/bin/env bash

# Any additional arguments are passed through to sort command.
# For example, you can order the sort by most changes to least by running with:
#   > git-diff-stat-sort -r
# To pipe the output through the "less" command while preserving coloring, you can use:
#   > git-diff-stat-sort -r | less -R
# Finally, to create a global git command alias, just run the following:
#   >  git config --global alias.diff-stat-sort '!git diff --stat --stat-width "$(tput cols)" --color=always | sort -t "|" -n -k2'
# The above alias will allow you to run the command without having to save/run the below command as a separate script,
# and instead, to just run it as a git subcommand. For example:
#   > git diff-stat-sort
# or even:
#   > git diff-stat-sort -r | less -R
git diff --stat --stat-width "$(tput cols)" --color=always | sort -t '|' -n -k2 "$@"

huh. Nevermind. found out the issue on my own. I think better fix is to change sort options to sort -k2 -t '|' -n, because there are a few problems with the existing method:

1. sort does not treat consecutive white spaces as a single field separator, annoyingly
2. the placement in the order for the summary line ("3 files changed, 13 insertions(+)...") could technically change depending on your locale specific settings and/or if the format of htat message changes.
3. any spaces in filenames would mess up the sort order because it would change the key being used for comparison.