#!/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