.shrc

# shellcheck shell=sh
# Shell configuration

# Utilities -------------------------------------------------------------------

SHELL_CMD="$(ps -o comm -p $$ | tail -n +2)"
export SHELL_CMD
SHELL_CMD_NAME="$(basename "$(printf %s "$SHELL_CMD" | sed 's|^-||')")"
export SHELL_CMD_NAME

strlist() {
    [ $# -eq 0 ] && return
    while [ $# -gt 1 ]; do
        #printf %s\\0 "$1" | xxd -p | tr -d '\n'
        printf %s: "$1"
        shift
    done
    #printf %s "$1" | xxd -p | tr -d '\n'
    printf %s "$1"
}

strlist_len() {
    #printf %s $(($(printf %s "$1" | xxd -r -p | tr -dC '\000' | wc -m) + 1))
    printf %s $(($(printf %s "$1" | tr -dC : | wc -m) + 1))
}

#strlist_at() {
#    # FIXME
#
#    local list0="$1"
#    local entry_i=0
#    while [ "$entry_i" != "$2" ] && [ -n "$list0" ]; do
#        [ "$(expr "X$list0" : 'X00.*')" ] && entry_i=$((entry_i + 1))
#        list0="$(printf %s "$list0" | tail -c +3)"
#    done
#
#    [ -z "$list0" ] && return 1
#
#    local list1="$list0"
#    local end_char_i=0
#    while [ "$end_char_i" -lt "${#list1}" ]; do
#        expr "X$list1" : 'X00.*' >/dev/null && break
#        list1="$(printf %s "$list1" | tail -c +3)"
#        end_char_i=$((end_char_i + 2))
#    done
#
#    [ "$end_char_i" -eq 0 ] && printf ''
#
#    printf %s "$list0" | head -c "$end_char_i" | xxd -r -p
#}
#
#strlist_each() {
#    # FIXME
#
#    local list0="$1"
#    local list1="$1"
#    shift
#    local end_char_i=0
#    while [ "$end_char_i" -lt "${#list}" ]; do
#        if expr "X$list" : 'X00.*' >/dev/null; then
#            entry="$(printf %s "$list" | head -c "$end_char_i" | xxd -r -p)"
#            echo entry: "$entry"
#            eval "$@" "$entry" || return
#        fi
#        list="$(printf %s "$list" | tail -c +3)"
#        end_char_i=$((end_char_i + 2))
#    done
#}

# Local config ----------------------------------------------------------------

PRE_SHRCS=''
SHRC_DIRS="$HOME"/.sh
case "$SHELL_CMD_NAME" in
    bash)
        PRE_SHRCS="$(strlist /etc/bashrc /etc/bash.bashrc /etc/bash/bashrc)"
        SHRC_DIRS="$(strlist "$SHRC_DIRS" "$HOME"/.bash)"
        export SHELL_NAME='Bash'
        ;;
    csh)
        SHRC_DIRS="$(strlist "$SHRC_DIRS" "$HOME"/.csh)"
        export SHELL_NAME='csh'
        ;;
    fish)
        SHRC_DIRS="$(strlist "$SHRC_DIRS" "$HOME"/.fish)"
        export SHELL_NAME='fish'
        ;;
    tcsh)
        SHRC_DIRS="$(strlist "$SHRC_DIRS" "$HOME"/.csh "$HOME"/.tcsh)"
        export SHELL_NAME='tcsh'
        ;;
    zsh)
        SHRC_DIRS="$(strlist "$SHRC_DIRS" "$HOME"/.zsh)"
        export SHELL_NAME='Zsh'
        ;;
esac

if command -v brew > /dev/null 2>&1; then
    GNU_CMD_DIRS="$(strlist "$PRE_SHRCS" "$(brew --prefix)"/opt/coreutils/libexec/gnubin)"
fi
GNU_CMD_DIRS="$(printf '%s:%s' "$PRE_SHRCS" /opt/local/libexec/gnubin)"

# External settings -----------------------------------------------------------

_debug=

# use GNU commands on non-GNU systems
while [ -n "$GNU_CMD_DIRS" ]; do
    dir="${GNU_CMD_DIRS%%:*}"
    if [ -d "$dir" ]; then
        PATH="$dir:$PATH"
        break
    fi
    if [ "$GNU_CMD_DIRS" = "$dir" ]; then
        GNU_CMD_DIRS=''
    else
        GNU_CMD_DIRS="${GNU_CMD_DIRS#*:}"
    fi
done
unset GNU_CMD_DIRS dir

#strlist_each "$PRE_SHRCS" .

while [ -n "$PRE_SHRCS" ] && [ ! "$abort" ]; do
    rc="${PRE_SHRCS%%:*}"

    if [ -e "$rc" ]; then
        [ "$_debug" ] && echo sourcing \'"$rc"\' >&2
        # NOTE:
        #   do not abort on nonzero exit, because these system-wide configs sometimes end in a
        #   test that returns nonzero
        # shellcheck disable=SC1090
        . "$rc"
    fi

    if [ "$PRE_SHRCS" = "$rc" ]; then
        PRE_SHRCS=''
    else
        PRE_SHRCS="${PRE_SHRCS#*:}"
    fi
done
unset PRE_SHRCS rc

while [ -n "$SHRC_DIRS" ] && [ ! "$abort" ]; do
    dir="${SHRC_DIRS%%:*}"

    if [ -d "$dir" ]; then
        for rc in "$dir"/*.*sh; do
            [ "$_debug" ] && echo sourcing \'"$rc"\' >&2
            # shellcheck disable=SC1090
            . "$rc" || abort=true
            [ "$abort" ] && break
        done
    fi

    if [ "$SHRC_DIRS" = "$dir" ]; then
        SHRC_DIRS=''
    else
        SHRC_DIRS="${SHRC_DIRS#*:}"
    fi
done
unset SHRC_DIRS dir rc

unset abort