wordpress-website-lifecycle/viktor-freshness

#!/bin/bash
#
# Manage WordPress must-use plugin freshness
#
# VERSION       :1.0.0
# DEPENDS       :apt-get install colordiff git
# LOCATION      :/usr/local/bin/viktor-freshness

set -euo pipefail

program_name="${0##*/}"
repository_dir="${VIKTOR_FRESHNESS_ROOT:-/usr/local/src/wordpress-website-lifecycle}"
source_dir="$repository_dir/mu-plugins"

usage() {
    cat <<EOF
Usage:
    $program_name update
    $program_name status
    $program_name diff
    $program_name deploy
    $program_name install FILE...

The target wp-content/mu-plugins directory is discovered from the current
directory and its parents.
The source repository defaults to /usr/local/src/wordpress-website-lifecycle.
Override it with VIKTOR_FRESHNESS_ROOT.
EOF
}

update_source() {
    git -C "$repository_dir" pull
}

target_dir() {
    local directory="$PWD"

    while true; do
        if [[ -d "$directory/wp-content/mu-plugins" ]]; then
            printf '%s/wp-content/mu-plugins\n' "$directory"
            return
        fi

        [[ "$directory" == / ]] && break
        directory="${directory%/*}"
        directory="${directory:-/}"
    done

    printf 'Could not find wp-content/mu-plugins from %s\n' "$PWD" >&2
    return 1
}

status() {
    local target
    local target_file
    local source_file
    local file_name
    local stale=0

    target="$(target_dir)"

    for target_file in "$target"/*.php; do
        [[ -e "$target_file" ]] || continue

        file_name="${target_file##*/}"
        source_file="$source_dir/$file_name"

        if [[ ! -e "$source_file" ]]; then
            printf '%-12s%s\n' 'unmanaged' "$file_name"
            stale=1
        elif cmp -s -- "$source_file" "$target_file"; then
            printf '%-12s%s\n' 'current' "$file_name"
        else
            printf '%-12s%s\n' 'stale' "$file_name"
            stale=1
        fi
    done

    return "$stale"
}

show_diff() {
    local target
    local target_file
    local source_file
    local file_name

    target="$(target_dir)"

    for target_file in "$target"/*.php; do
        [[ -e "$target_file" ]] || continue

        file_name="${target_file##*/}"
        source_file="$source_dir/$file_name"

        [[ -e "$source_file" ]] || continue
        cmp -s -- "$source_file" "$target_file" && continue

        colordiff -u \
            --label "source/$file_name" \
            --label "installed/$file_name" \
            "$source_file" \
            "$target_file" || true
    done
}

deploy() {
    local target
    local target_file
    local source_file
    local file_name

    target="$(target_dir)"

    for target_file in "$target"/*.php; do
        [[ -e "$target_file" ]] || continue

        file_name="${target_file##*/}"
        source_file="$source_dir/$file_name"

        [[ -e "$source_file" ]] || continue
        cmp -s -- "$source_file" "$target_file" && continue

        cp -- "$source_file" "$target_file"
        printf '%-12s%s\n' 'deployed' "$file_name"
    done
}

install_files() {
    local target
    local file_name

    target="$(target_dir)"

    for file_name in "$@"; do
        cp -- "$source_dir/$file_name" "$target/$file_name"
        printf '%-12s%s\n' 'installed' "$file_name"
    done
}

if (( $# < 1 )); then
    usage
    exit 2
fi

command_name="$1"
shift

case "$command_name" in
    update)
        update_source
        ;;
    status)
        status
        ;;
    diff)
        show_diff
        ;;
    deploy)
        deploy
        ;;
    install)
        if (( $# == 0 )); then
            usage
            exit 2
        fi
        install_files "$@"
        ;;
    *)
        usage
        exit 2
        ;;
esac