#!/bin/bash

# This scripts updates all the "Copyright" lines in source files with the
# correct most recent modification years.
#
# It must be given a file in argument. A typical usage can be to run it on all
# code source files:
#
# find \( -name '*.m' -or -name '*.cc' -or -name '*.hh' -or -name '*.c' -or -name '*.h' -or -name '*.f08' -or -name '*.F08' \) -exec scripts/fix-copyright-years '{}' ';'
#
# The LAST_UPDATE_COMMIT variable must be updated to contain the number of the
# last commit in which such a copyright update has been done.
#
# Note that the script does not understand some unusual copyright notices: it
# will display a message in that case.

LAST_UPDATE_COMMIT=a3afba706bf2a6e3ba8f96874cc47ded7e39db9d # dynare.git
#LAST_UPDATE_COMMIT=12c91b786ce59e2f1fc7fefcbf0a94a062ea0c5d # dseries.git
#LAST_UPDATE_COMMIT=a1728ec6bfc760ab7f0d48f5897ec27baebf211b # preprocessor.git

if [[ -z $1 ]]; then
    echo "Give a filename in argument"
    exit 1
fi

if [[ ! -f $1 ]]; then
    echo "$1: Unknown file"
    exit 1
fi

GITYEAR=$(git log $LAST_UPDATE_COMMIT.. --date=short --pretty=format:%cd -n 1 "$1")
GITYEAR=${GITYEAR%%-*}

if [[ -z $GITYEAR ]]; then
    # Not in git
    exit 0
fi

COPYLINES=$(grep -c Copyright "$1")

if ((COPYLINES == 0)); then
    echo "$1: File has no copyright line"
    exit 1
fi

if ((COPYLINES == 2)); then
    COPYLINES=$(grep Copyright "$1")
    echo "$1: File has too many copyright lines (Git year: $GITYEAR): $COPYLINES"
    exit 1
fi

COPYLINE=$(grep -o -E "Copyright © ([[:digit:]]{4}-)?[[:digit:]]{4} Dynare Team" "$1")

if [[ -z $COPYLINE ]]; then
    COPYLINE=$(grep Copyright "$1")
    echo "$1: Unsupported copyright notice (Git year: $GITYEAR): $COPYLINE"
    exit 1
fi

[[ $COPYLINE =~ Copyright\ ©\ ([0-9]{4}-)?([0-9]{4})\ Dynare\ Team ]]

ACTUALYEAR=${BASH_REMATCH[2]}

if ((GITYEAR > ACTUALYEAR)); then
    sed -E -i "s/Copyright © ([0-9]{4})(-[0-9]{4})? Dynare Team/Copyright © \1-$GITYEAR Dynare Team/" "$1"
    echo "$1: Updating to $GITYEAR"
fi
