.git-fix-whitespaces.sh

#!/bin/sh
#
# An example hook script to verify what is about to be committed.
# 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.
#
# To enable this hook, rename this file to "pre-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

# If you want to allow non-ascii filenames set this variable to true.
allownonascii=$(git config hooks.allownonascii)

# Redirect output to stderr.
exec 1>&2

# Cross platform projects tend to avoid non-ascii filenames; prevent
# them from being added to the repository. We exploit the fact that the
# printable range starts at the space character and ends with tilde.
if [ "$allownonascii" != "true" ] &&
    # Note that the use of brackets around a tr range is ok here, (it's
    # even required, for portability to Solaris 10's /usr/bin/tr), since
    # the square bracket bytes happen to fall in the designated range.
    test $(git diff --cached --name-only --diff-filter=A -z $against |
      LC_ALL=C tr -d '[ -~]\0' | wc -c) != 0
then
    echo "Error: Attempt to add a non-ascii file name."
    echo
    echo "This can cause problems if you want to work"
    echo "with people on other platforms."
    echo
    echo "To be portable it is advisable to rename the file ..."
    echo
    echo "If you know what you are doing you can disable this"
    echo "check using:"
    echo
    echo "  git config hooks.allownonascii true"
    echo
    exit 1
fi

staged_files=`git diff-index --name-status --cached $against      | # Find all staged files
                egrep -i '^(A|M).*\.(h|m|mm|cpp|js|html|txt|sh)$' | # Only process certain files
                sed -e 's/^[AM][[:space:]]*//'                    | # Remove leading git info
                sort                                              | # Remove duplicates
                uniq`


partially_staged_files=`git status --porcelain --untracked-files=no | # Find all staged files
                        egrep -i '^(A|M)M '                         | # Filter only partially staged files
                        sed -e 's/^[AM]M[[:space:]]*//'             | # Remove leading git info
                        sort                                        | # Remove duplicates
                        uniq`

# Merge staged files and partially staged files
staged_and_partially_staged_files=${staged_files}$'\n'${partially_staged_files}

# Remove all files that are staged *AND* partially staged
# Thus we get only the fully staged files
fully_staged_files=`echo "$staged_and_partially_staged_files" | sort | uniq -u`

# Change field separator to newline so that for correctly iterates over lines
IFS=$'\n'

for FILE in $fully_staged_files ; do
    echo "Fixing whitespace and newline in $FILE" >&2

    # Fix line endings to UNIX format
    sed -i 's/^M$//' "$FILE"
    
    # Replace tabs with four spaces
    sed -i $'s/\t/    /g' "$FILE"

    # Add newline to the end of the file
    sed -i '${/^$/!s/$/\
    /;}' "$FILE"
    
    # Strip trailing whitespace
    sed -i -E 's/[[:space:]]*$//' "$FILE"

    # Stage all changes
    git add "$FILE"
done

exit

setup.sh

# Install whitespace git hook for repository:
# Run from repository root dir
if [ -f .git-fix-whitespaces.sh ]
then
    ln -fs ../../.git-fix-whitespaces.sh .git/hooks/pre-commit
else
    echo '\nError: Fix whitespace script not found repository.'
fi