Git ignore demo

main.sh

#!/usr/bin/env bash

basedir="$(cd "$(dirname "${BASH_SOURCE}")" >/dev/null; pwd)" || exit 1
current_datetime="$(date --utc --iso-8601=ns)"

function main.clean() {
    rm -rf "${basedir}/"{001..004}".txt" "${basedir}/"{boo,foo,bar,far}
}

function main.mkfile() {
    local path="$1"; shift
    echo "${path}"
    local absolutefile="${basedir}/${path}"
    local absoluteparent="$(dirname "${absolutefile}")"
    [[ -d "${absoluteparent}" ]] || {
        mkdir -p "${absoluteparent}" || return 1
    }
    cat > "${absolutefile}" || return 2
}

function main.mkgitignore() {
    local dirpath="$1"
    main.mkfile "${dirpath}/.gitignore"
}

function main.mkfiles() {
    local rc=0
    while [[ $# > 0 ]]; do
        local path="$1"; shift
        main.mkfile "${path}" <<<"${current_datetime}" || rc=$?
    done
    return $rc
}

function main.mkdir() {
    local dirpath="$1"; shift
    main.mkfiles "${dirpath}/"{001..004}".txt"
}

function main.mkdirs() {
    local rc=0
    while [[ $# > 0 ]]; do
        local dirpath="$1"; shift
        main.mkdir "${dirpath}" || rc=$?
    done
    return $rc
}

function main.mktree() {
    local treepath="$1"
    main.mkdirs "${treepath}/"{,boo,foo,bar,far}
}

function main.mktrees() {
    local rc=0
    while [[ $# > 0 ]]; do
        local treepath="$1"; shift
        main.mktree "${treepath}" || rc=$?
    done
    return $rc
}

function main() {
    echo
    echo "  ¤  Clean file tree"
    main.clean

    echo
    echo "  ¤  Generating file tree"
    main.mktrees {.,boo,foo,bar,far}

    echo
    echo "  ¤  Generating Git ignore file"
    main.mkgitignore '.' <<EOF
# Ignore <001> in <tree>
# Ignore <boo> in <tree>
# Ignore <002> in <folder>
# Ignore <far> in <folder>
001.txt
boo
/002.txt
/far
EOF

    main.mkgitignore 'foo' <<EOF
# Reckon <001> in <folder>
# Ignore <002> in <folder>
# Ignore <003> in <tree>
!/001.txt
/002.txt
003.txt
EOF

    main.mkgitignore 'bar' <<EOF
# Reckon <001> in <tree>
!001.txt
EOF

    echo
    echo "  ¤  Show changed files"
    git ls-files --others --exclude-standard
}

main