#!/usr/bin/env bash
#
# 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".

die() {
    echo '-------------------------' 1>&2
    echo 'pre-commit check failure' 1>&2
    echo '-------------------------' 1>&2
    echo "$@" 1>&2

    if [ -f /tmp/capp_lint.tmp ]; then
        rm -f /tmp/capp_lint.tmp
    fi

    exit 1
}

#-----------------------------------------------------------------------------
# Check for committer identity.
advice='
Use the commands:

    git config --global user.name '\''Your Name'\''
    git config --global user.email '\''you@yourdomain.com'\''

to introduce yourself to Git before committing.'

# Ensure name and email are available.
git config --get user.name > /dev/null &&
git config --get user.email > /dev/null ||
die 'Identity not configured!' "$advice"

# Validate the name and email.
git config --get user.name | grep ' ' > /dev/null ||
die 'Please set user.name to your Real Name (with a space), not a userid.' "$advice"
git config --get user.email | grep '^[^@]*@[^@]*$' > /dev/null ||
die 'Please set user.email to an email address (userid@validdomain.com).' "$advice"

#-----------------------------------------------------------------------------
# Check content that will be added by this commit.

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

# Disallow non-ascii file names. The printable range starts at the
# space character and ends with tilde.
if test "$(git diff --cached --name-only --diff-filter=A -z $against |
       LC_ALL=C tr -d '[ -~]\0')"; then
    die 'Non-ascii file names may not be added:
'"$(git diff --cached --name-only --diff-filter=A $against)"
fi

# Check for trailing whitespaces, indents that uses a space before a tab and leftover conflict markers
if test "$(git diff-index --check --cached $against --)"; then
    die 'The following whitespace errors or unresolved conflicts have been found:
'"$(git diff-index --check --cached $against --)"
fi

#-----------------------------------------------------------------------------
# Check for inadvertent globals and dangling variable declarations.

fileCount=`git diff --cached --name-only --diff-filter=AM $against | wc -l`

if [[ fileCount -ne "0" ]]; then
    lintPath=''

    if [[ `which capp_lint.py` ]]; then
        lintPath="`which capp_lint.py`"
    fi

    if [[ -z "$lintPath" && `which capp_lint` ]]; then
        lintPath="`which capp_lint`"
    fi

    if [[ -z "$lintPath" ]]; then
        path=`dirname $0`/capp_lint.py

        if [[ -x "$path" ]]; then
            lintPath="$path"
        fi
    fi

    if [[ -z "$lintPath" ]]; then
        die 'Could not find capp_lint or capp_lint.py in your PATH or in .git/hooks.'
    fi

    git diff --cached --name-only --diff-filter=AM $against | "$lintPath" - > /tmp/capp_lint.tmp

    if [ -s /tmp/capp_lint.tmp ]; then
        die 'The following lint errors were found:

    '"$(cat /tmp/capp_lint.tmp)"
    else
        rm -f /tmp/capp_lint.tmp
    fi
fi

exit 0