#!/bin/bash
#
# Simple pre-commit hook to check that there are no errors in the fdroidserver
# source files.

# Redirect output to stderr.
exec 1>&2

files=`git diff-index --cached HEAD 2>&1 | sed 's/^:.*     //' | uniq | cut -b100-500`
if [ -z "$files" ]; then
    PY_FILES="fdroid makebuildserver setup.py examples/*.py buildserver/*.py fdroidserver/*.py"
    PY_TEST_FILES="tests/*.TestCase"
    SH_FILES="hooks/pre-commit"
    BASH_FILES="fd-commit jenkins-build docs/update.sh completion/bash-completion buildserver/provision-*"
    RB_FILES="buildserver/cookbooks/*/recipes/*.rb buildserver/Vagrantfile"
else
    # if actually committing right now, then only run on the files
    # that are going to be committed at this moment
    PY_FILES=
    PY_TEST_FILES=
    SH_FILES=
    BASH_FILES=
    RB_FILES=

    for f in $files; do
        test -e $f || continue
        case $f in
            *.py)
                PY_FILES+=" $f"
                ;;
            *.TestCase)
                PY_TEST_FILES+=" $f"
                ;;
            *.rb)
                RB_FILES+=" $f"
                ;;
            *)
                if head -1 $f | grep '^#!/bin/sh' > /dev/null 2>&1; then
                    SH_FILES+=" $f"
                elif head -1 $f | grep '^#!/bin/bash' > /dev/null 2>&1; then
                    BASH_FILES+=" $f"
                elif head -1 $f | grep '^#!.*python' > /dev/null 2>&1; then
                    PY_FILES+=" $f"
                fi
                ;;
        esac
    done
fi

# We ignore the following PEP8 warnings
# * E123: closing bracket does not match indentation of opening bracket's line
#   - Broken if multiple indentation levels start on a single line
# * E501: line too long (82 > 79 characters)
#   - Recommended for readability but not enforced
#   - Some lines are awkward to wrap around a char limit
# * W503: line break before binary operator
#   - Quite pedantic

PEP8_IGNORE="E123,E501,W503"

err() {
	echo >&2 ERROR: "$@"
	exit 1
}

warn() {
	echo >&2 WARNING: "$@"
}

cmd_exists() {
	command -v $1 1>/dev/null
}

find_command() {
	for name in $@; do
		for suff in "3" "-python3" ""; do
			cmd=${name}${suff}
			if cmd_exists $cmd; then
				echo $cmd
				return 0
			fi
		done
	done
	warn "$1 is not installed, using dummy placeholder!"
	echo :
}

PYFLAKES=$(find_command pyflakes)
PEP8=$(find_command pycodestyle pep8)

if [ "$PY_FILES $PY_TEST_FILES" != " " ]; then
    if ! $PYFLAKES $PY_FILES $PY_TEST_FILES; then
	err "pyflakes tests failed!"
    fi
fi

if [ "$PY_FILES" != "" ]; then
    if ! $PEP8 --ignore=$PEP8_IGNORE $PY_FILES; then
	err "pep8 tests failed!"
    fi
fi

# The tests use a little hack in order to cleanly import the fdroidserver
# package locally like a regular package.  pep8 doesn't see that, so this
# makes pep8 skip E402 on the test files that need that hack.
if [ "$PY_TEST_FILES" != "" ]; then
    if ! $PEP8 --ignore=$PEP8_IGNORE,E402 $PY_TEST_FILES; then
	err "pep8 tests failed!"
    fi
fi

for f in $SH_FILES; do
	if ! dash -n $f; then
		err "dash tests failed!"
	fi
done

for f in $BASH_FILES; do
	if ! bash -n $f; then
		err "bash tests failed!"
	fi
done

for f in $RB_FILES; do
	if ! ruby -c $f 1>/dev/null; then
		err "ruby tests failed!"
	fi
done

exit 0