entrypoint.sh

#!/bin/bash -
#title          :entrypoint.sh
#description    :This script runs clang format on slected file/folder and exit with status 0 if every file is formated correctly.
#author         :RafikFarhad<rafikfarhad@gmail.com>
#date           :20200809
#version        :1.0.0
#usage          :./entrypoint.sh
#notes          :Optional env values are: INPUT_STYLE,INPUT_SOURCES,INPUT_EXCLUDES
#bash_version   :5.0.17(1)-release
###################################################
function log() {
    echo -e "[ gh-action ] :: $1"
}

SOURCES=()
PROBLEMETIC_FILES=()
EXIT_STATUS=0
STYLE="-style=file"

function resolve_inputs() {
    INPUT_STYLE=${INPUT_STYLE:-"file"}
    if [[ $INPUT_STYLE != "file" ]]; then
        STYLE="--style=$INPUT_STYLE"
    fi
    INPUT_SOURCES=${INPUT_SOURCES:-"**/*"}
}

function check_file() {
    local file="$1"
    message="$(clang-format -n -Werror --ferror-limit=1 $STYLE --fallback-style=LLVM "${file}")"
    local status="$?"
    if [ $status -ne 0 ]; then
        echo "$message" >&2
        EXIT_STATUS=1
        return 1
    fi
    return 0
}

function find_cmd() {
    IFS=','
    paths="$1"
    excludes="$2"
    local -n cmd="$3"
    
    cmd+="find . -type f "
    if [ -n "$excludes" ]; then
        for exclude in $excludes; do
            cmd+="! -wholename \"./$exclude\" "
        done
    fi

    cmd+="\( "
    local is_first=1
    for path in $paths; do
        if [ $is_first -ne 1 ]; then
            cmd+="-o "
        fi
        cmd+="-wholename \"./$path\" "
        is_first=0
    done
    cmd+=" \)"
    
    unset IFS
}

function main() {
    log "Action started"
    resolve_inputs
    log "Sources to check: $INPUT_SOURCES"
    if [ -n "$INPUT_EXCLUDES" ]; then
        log "Excluding: $INPUT_EXCLUDES"
        find_cmd "$INPUT_SOURCES" "$INPUT_EXCLUDES" FIND_CMD
    else
        find_cmd "$INPUT_SOURCES" "" FIND_CMD
    fi

    for file in $(eval $FIND_CMD); do
        log "Checking file: $file"
        check_file "$file"
        if [ $? -ne 0 ]; then
            PROBLEMETIC_FILES+=("$file")
        fi
    done

    if [ $EXIT_STATUS -eq 0 ]; then
        log "Congrats! The sources are clang formatted."
        exit 0
    else
        log "Some file is not formatted correctly."
        log "You might want to run: "
        for ((i = 0; i < ${#PROBLEMETIC_FILES[@]}; i++)); do
            if [ $i -ne 0 ]; then
                echo -n " && "
            fi
            echo "clang-format $STYLE -i "${PROBLEMETIC_FILES[$i]}" \\"
        done
        exit 1
    fi
}

cd "$GITHUB_WORKSPACE" || exit 2
main