pre-commit

#!/bin/bash
# called with no arguments by 'git commit'
#
# if necessary, stops the commit by exiting with a non-zero exit status

# redirect all output to stderr
exec 1>&2

# bail if a command fails
set -e

# figure out the commit to diff against
against=HEAD
# diff against an empty tree object if this is the initial commit
if ! git rev-parse --verify HEAD &>/dev/null; then
	against="$(git hash-object -t tree /dev/null)"
fi

# check for whitespace errors
git diff-index --check --cached $against --

# prevent non-ascii filenames from being added
echo "Checking for non-ASCII filenames..."
if git diff --cached --name-only --diff-filter=A -z $against \
	| LC_ALL=C tr -d '[ -~]\0' \
	| wc -c \
	| grep -qvx 0
then
	# try to show files with non-ascii filenames
	git diff --cached --name-only --diff-filter=A -z $against \
		| tr '\0' '\n' \
		| grep '[ -~]'
	echo "Non-ASCII filenames detected. Rename them before committing."
	exit 1
fi

## update the version
#verfile=bin/myscript
#srcfiles=(
#	src/*
#)
#updatever() {
#	local oldver="$(sed -E -n "/version\s*=/ {s/.*version\s*=[\"']?//; s/[\"']$//;p;q}" "$verfile")"
#	#local oldver="$( "./$verfile" --version )"
#	local newver="${oldver%.*}.$(( ${oldver##*.}+1 ))"
#	echo "Updating version from $oldver to $newver..."
#	sed -E -i "/version\s*=/ s/=.*/='$newver'/" "$verfile"
#}
## check if we're committing a change to a source file
#if git diff --name-only --cached \
#	| grep -q -xFf <(printf "%s\n" "$verfile" "${srcfiles[@]}")
#then
#	# check if $verfile has no unstaged changes
#	if ! git status --porcelain | grep -q "^.M $verfile"; then
#		# update version and add $verfile to commit
#		updatever
#		echo "Adding $verfile to commit..."
#		git add "$verfile"
#	# update the version and check if it changed
#	elif updatever; git diff "$verfile" | egrep -q '^[+-].*version\s*='; then
#		# prompt user to add the updated version to the commit
#		echo "Add the version change with \`git add -p $verfile\` before committing."
#		exit 1
#	fi
#fi

# update docs
make doc
git add doc/* README.asciidoc

## run tests
#make -kB check

## unstage a file if the only lines in it that changed start with a pattern
#file=PKGBUILD
#lname='$pkgver'
#pattern='\s*pkgver\s*='
#if ! git diff --cached "$file" \
#	| egrep -v -e "^[+-]$pattern" -e '^[+-]{3}' \
#	| grep -q '^[+-]'
#then
#	echo "Unstaging $file because only $lname changed..."
#	git restore --staged "$file"
#fi

## aur: update .SRCINFO, based on:
## https://github.com/eli-schwartz/aurpublish/blob/master/pre-commit.hook
#git diff --cached --name-status | grep "^[AM].*PKGBUILD" | while read M file; do
#	dir="$(dirname "$file")"
#	echo "Updating .SRCINFO metadata..."
#	( cd "$dir" && makepkg --printsrcinfo > .SRCINFO )
#	git add "$dir/.SRCINFO"
#done

## jekyll: update last_modified_at date in frontmatter
#lastmodified="$(date -u "+%Y-%m-%d %T %Z")"
#git diff --cached --name-status | grep "^[AM]" | while read M file; do
#	sed -E -i "/^---/,/^---/ s/^(last_modified_at:).*/\1 $lastmodified/" "$file"
#	git add "$file"
#done