pre-commit Git hook

pre-commit

#!/bin/sh
#
# Called by "git commit" with no arguments.  The hook should
# exit with non-zero status after issuing an appropriate message if
# it wants to stop the commit.

if git rev-parse --verify HEAD >/dev/null 2>&1
then
	against=HEAD
else
	# Initial commit: diff against an empty tree object
	against=4b825dc642cb6eb9a060e54bf8d69288fbee4904
fi

# Redirect output to stderr.
exec 1>&2

# if committing files matching '300x300', but not also files matching
# '110x110', then they did not run the image script.
if
    test $(git diff --cached --name-only --diff-filter=ACMR $against | grep -c '300x300') != 0 &&
    test $(git diff --cached --name-only $against | grep -c '110x110') = 0
then
	cat <<\EOF

You are adding "master" images (300x300).

EOF
	# just the unique prefix (first part of filename before the hyphen):
	for i in `git diff --cached --name-only --diff-filter=ACMR $against | grep '300x300' | awk '{ split($1,fld,/300x300\//); split(fld[2],pre,/-/); print pre[1] }' | uniq`
	do
        echo "Running image script on prefix: $i..." &&
        bin/thumb_images_file.pl -limit_prefix=$i -overwrite > /dev/null 2>/dev/null &&
        bin/thumb_images_file.pl -limit_prefix=$i -overwrite -keylines > /dev/null 2>/dev/null
    done
	cat <<\EOF

*** Please add the newly-created files, and re-commit.

EOF
	exit 1
fi

# if committing files in /js or /css directories, but not also files in
# /dist, then need to run minify script.
if
    test $(git diff --cached --name-only --diff-filter=ACMR $against | grep -cE '/(css|js)/') != 0 &&
    test $(git diff --cached --name-only $against | grep -c '/dist/') = 0
then
    cat <<\EOF

You are modifying CSS and/or JS files. We are running the minify script...

EOF
    bin/minify &&
    git add htdocs/dist/ &&
    cat <<\EOF

*** Please now run your commit again.

EOF
    exit 1
fi