Bash History Configuration

history.inc.sh

if [ "${BASH_VERSION-}" ]; then

# Local variables the functions depend upon
_bash_history_prefix=~/.local/history/bash

# {{{ Begining of the temporary functions block
_bash_history_get_today() {
    date '+%Y/0%m/%d'
}

_bash_history_get_now() {
    local now

    now="${EPOCHREALTIME-}"
    if [[ -n "${now}" ]]; then
        printf '%s\n' "${now}"
    else
        date '+%s.%06N'
    fi
}

_bash_history_get_path_parts() {
    local IFS

    IFS=/
    set -- $@
    while [ $# -gt 0 ]; do
        printf -- '%s\n' "$1"
        shift
    done
}

# prevent path traversal by limiting the arguments
_bash_history_filter_dir_args() {
    local dir

    # only make dirs that contain only numbers
    for dir in $(_bash_history_get_path_parts "${@}")
    do
        case "${dir}" in
            (*[![:digit:]]*) return 1 ;;
        esac
    done
    case "${subdir}" in
        # limit to 31 days and 12 months in any year
        ([[:digit:]]*[[:digit:]]/00[[:digit:]]/3[01]) ;;
        ([[:digit:]]*[[:digit:]]/00[[:digit:]]/[012][[:digit:]]) ;;
        ([[:digit:]]*[[:digit:]]/01[012]/3[01]) ;;
        ([[:digit:]]*[[:digit:]]/01[012]/[012][[:digit:]]) ;;
        (*) return 2 ;;
    esac

    return 0
}

_bash_history_create_dir() {
    local dir subdir

    subdir="${1:?}"
    dir="${_bash_history_prefix:-.}/${subdir}"
    if _bash_history_filter_dir_args "${subdir}"; then
        test -d "${dir}" || mkdir -p "${dir}"
    fi
}

_bash_history_today="$(_bash_history_get_today)"
_bash_history_now="$(_bash_history_get_now)"

_bash_history_create_dir "${_bash_history_today}"

unset -f _bash_history_get_today
unset -f _bash_history_get_now
unset -f _bash_history_get_path_parts
unset -f _bash_history_filter_dir_args
unset -f _bash_history_create_dir
# }}} End of the temporary functions block

# Read the default history file with the default configuration
if shopt -q -o history; then
    :
    #history -r "${_bash_history_prefix:?}/default"
    #history -n "${_bash_history_prefix:?}/default"
    history -n
fi

HISTFILE="${_bash_history_prefix:?}/${_bash_history_today:?}/${_bash_history_now:?}"
export HISTFILE

HISTCONTROL='ignorespace:ignoredups'
export HISTCONTROL

HISTSIZE=-1
HISTFILESIZE="${HISTSIZE}"
export HISTSIZE HISTFILESIZE

HISTTIMEFORMAT='%Y+%j %k:%M:%S  '
export HISTTIMEFORMAT

HISTIGNORE='bash:bg:dash:dirs:env:exit:fc:fg:history:jobs:pwd:set:sh:vi:vim'
export HISTIGNORE

shopt -s cmdhist
shopt -s histappend
shopt -s histverify

_bash_history_fifo="${_bash_history_prefix:?}/read-previous"
# the fifo exists, or remove whatever may be there and create it
test -p "${_bash_history_fifo}" || {
    rm -rf "${_bash_history_fifo}";
    mkfifo -m 0600 "${_bash_history_fifo}";
}

# only try this with the fifo ready and history enabled
if shopt -q -o history && [ -p "${_bash_history_fifo}" ]; then
    find "${_bash_history_prefix:?}" -name '[[:digit:]]*[[:digit:]]\.[[:digit:]]*[[:digit:]]' -type f -print0 | xargs -0 -r printf -- 'history -n %q\n' >> "${_bash_history_fifo}" &
    . "${_bash_history_fifo}"
fi

unset -v _bash_history_fifo
unset -v _bash_history_now
unset -v _bash_history_today
unset -v _bash_history_prefix

# write history to disk before printing the next prompt
declare -a PROMPT_COMMAND
PROMPT_COMMAND+=('shopt -q -o history && history -a')

fi