#!/bin/bash
#
# Copyright (c) 2018 The Bitcoin Core developers
# Distributed under the MIT software license, see the accompanying
# file COPYING or http://www.opensource.org/licenses/mit-license.php.
#
# Check for duplicate includes.

filter_suffix() {
    git ls-files | grep -E "^src/.*\.${1}"'$' | grep -Ev "/(leveldb|secp256k1|univalue)/"
}

EXIT_CODE=0
for HEADER_FILE in $(filter_suffix h); do
    DUPLICATE_INCLUDES_IN_HEADER_FILE=$(grep -E "^#include " < "${HEADER_FILE}" | sort | uniq -d)
    if [[ ${DUPLICATE_INCLUDES_IN_HEADER_FILE} != "" ]]; then
        echo "Duplicate include(s) in ${HEADER_FILE}:"
        echo "${DUPLICATE_INCLUDES_IN_HEADER_FILE}"
        echo
        EXIT_CODE=1
    fi
    CPP_FILE=${HEADER_FILE/%\.h/.cpp}
    if [[ ! -e $CPP_FILE ]]; then
        continue
    fi
    DUPLICATE_INCLUDES_IN_HEADER_AND_CPP_FILES=$(grep -hE "^#include " <(sort -u < "${HEADER_FILE}") <(sort -u < "${CPP_FILE}") | grep -E "^#include " | sort | uniq -d)
    if [[ ${DUPLICATE_INCLUDES_IN_HEADER_AND_CPP_FILES} != "" ]]; then
        echo "Include(s) from ${HEADER_FILE} duplicated in ${CPP_FILE}:"
        echo "${DUPLICATE_INCLUDES_IN_HEADER_AND_CPP_FILES}"
        echo
        EXIT_CODE=1
    fi
done
for CPP_FILE in $(filter_suffix cpp); do
    DUPLICATE_INCLUDES_IN_CPP_FILE=$(grep -E "^#include " < "${CPP_FILE}" | sort | uniq -d)
    if [[ ${DUPLICATE_INCLUDES_IN_CPP_FILE} != "" ]]; then
        echo "Duplicate include(s) in ${CPP_FILE}:"
        echo "${DUPLICATE_INCLUDES_IN_CPP_FILE}"
        echo
        EXIT_CODE=1
    fi
done
exit ${EXIT_CODE}

Add Travis check for duplicate includes
Add Travis check for duplicate includes

This enforces parts of the project header include guidelines (added by @sipa in #10575).
