#!/bin/bash

#

# Hook script to clean up code and build docs.

# Only .js files are checked.

# Called by "git commit" with no arguments.

# The hook should exit with non-zero status if it wants to stop the commit.

# Loop over staged files and clean them up.

while IFS= read -rd '' file

do

# Special checks for JavaScript sources:

if [[ $file == *.js && $file != *.min.js && $file != public/* && $file != docs/* && $file != build/* ]]

then

echo "Checking: '$file'"

len1=`wc -c < "$file"`

# Remove trailing whitespace on lines.

sed -i 's/\s\+$//' "$file"

len2=`wc -c < "$file"`

[ $len1 != $len2 ] && echo "Removed trailing whitespace in '$file'."

len1=$len2

# Remove leading and trailing blank lines, ensure that file ends in newline.

sed -i '/./,$!d;:a;/^\n*$/{$d;N;};/\n$/ba;$a\' "$file"

len2=`wc -c < "$file"`

[ $len1 != $len2 ] && echo "Removed surrounding empty lines in '$file'."

len1=$len2

# Remove trailing empty lines.

sed -i -e :a -e '/^\n*$/{$d;N;};/\n$/ba' "$file"

len2=`wc -c < "$file"`

[ $len1 != $len2 ] && echo "Removed trailing whitespace in '$file'."

len1=$len2

# Check for tabs.

if grep -q $'\t' "$file"

then

echo "ABORT: Found tab character in '$file'!"

exit 1

fi

# Remove debugger statements which are alone on a line.

sed -i '/^\s*debugger;\{0,1\}$/d' "$file"

len2=`wc -c < "$file"`

[ $len1 != $len2 ] && echo "Removed debugger statements in '$file'."

len1=$len2

# Check for debugger statements which are not alone on a line.

if grep -q 'debugger' "$file"

then

echo "ABORT: Found complicated debugger statement in '$file'!"

exit 1

fi

# Check for lines wider than 80 characters.

lines=$(grep -n '.\{81,\}' "$file" | cut -d: -f1 | paste -sd',')

if [ -n "$lines" ]

then

echo "ABORT: More than 80 characters in '$file' on line(s) $lines!"

exit 1

fi

fi

# Keep these changes.

git add "$file"

done < <(git diff --cached --name-only --diff-filter=ACM -z)

# Build documentation if possible.

if [ -x bin/make.js -a -d docs ]

then

node bin/make.js doc

git add -u docs/

fi