shellcheck_ci

#!/bin/bash
# Author: Aleksander Baranowski
# License: MIT (https://choosealicense.com/licenses/mit/)
# This simple script looks for changed .sh file from the last git commit
# then run shellcheck on them.
# USAGE: shellcheck_ci repo_root_dir

# Exit codes:
# 98 - required command is not installed
# 1 - some file failed check
# 0 - success

# VARS
MY_REQUIRED_COMMANDS="python shellcheck git"
MY_DIR_TO_CHECK=""
MY_FILES_TO_CHECK=""

check_required_commands(){
    for my_command in $MY_REQUIRED_COMMANDS; do
        hash "$my_command" 2>/dev/null || { 
        echo "Script require $my_command command! Aborting."; exit 98;
        } # Using 98 as exit code
    done
}

print_help(){
    echo "Usage: $0 DIRECTORY_TO_CHECK"
    exit 1
}

setup_script(){
    if [ $# -ne 1 ];then
        print_help
    fi
    MY_DIR_TO_CHECK="$1"
    [ -d  "$MY_DIR_TO_CHECK" ] ||  { echo "$1 is not directory!"; exit 1; }
}

find_files_to_check(){
    pushd "$MY_DIR_TO_CHECK" > /dev/null
    MY_FILES_TO_CHECK=$(git show --pretty="format:" --name-only | grep ".*\.sh$")
    echo "Found $( echo "$MY_FILES_TO_CHECK" | wc -w) *.sh file/s"
    popd > /dev/null
}

run_shellcheck(){
    if [[ -z "$MY_FILES_TO_CHECK" ]]; then
        echo "No *.sh script found - skipping"
        exit 0
    else
        # disable fail on first error; multiple scripts might not pass;
        # fail_flag is now responsible for exit code
        set +e
        fail_flag=0

        for i in $MY_FILES_TO_CHECK; do
            output=$(shellcheck --format=json "${MY_DIR_TO_CHECK}/${i}")
            output_status=$?
            if [[ $output_status -ne 0 ]]; then
                fail_flag=$((fail_flag+1))
                echo "==== Script $i REPORT: ===="
                echo "$output" | python -m json.tool
            fi
        done
    fi
    if [[ $fail_flag -ne 0 ]]; then
        echo "$fail_flag script/s failed :(" && exit 1
    else
        echo "All script/s passed :)"
    fi
}

check_required_commands
setup_script "$@"
find_files_to_check
run_shellcheck