dot_bashrc

#!/usr/bin/env bash
# vim: ai tw=74 fen fdm=marker nospell fmr={,} sw=4
# shellcheck disable=SC2155
#
######## KMZ big huge .bashrc {
# This file is rewritten from scratch in February 2026, AGAIN
# REQUIRES bash version >= 2.04
#
# NOTE!!!! Don't make changes to this file for a single machine. Use
# .bashrc.local. See "Local Customisations" below.
#
####### General
#
# This file is designed on the assumption that bash is NOT our login
# shell. If it was then the env variable setting should be in the
# .bash_profile file, not the .bashrc. I've made a special effort to keep
# the number of external calls to a minimum
#
####### Local Customisations
#
# It's best not to change this file on a machine-by-machine basis. For
# local extensions this file calls ~/.bashrc.local if it exists. It's
# called twice: once before all processing with a single parameter ($1)
# "pre" and once after all processing with a single parameter "post".
#
# In addition, a number of variables are set and are available for use by
# the ~/.bashrc.local script. These variables are UNset before .bashrc
# exits, so they are not available once the shell is interactive.
#
# The variables set by this script are:
#   _debugging                          Manually set (see below) to "1" if
#                                       parts of this and called scripts
#                                       should be verbose in their output.
#                                       Unset otherwise. NOTE that some
#                                       non-interactive tools (e.g. rsync)
#                                       get confused by stuff being
#                                       printed at shell startup so
#                                       normally this should be OFF.
#
#   _shell_is_interactive               Set to "1" if this is an interactive
#                                       session, and unset otherwise. No
#                                       output should be produced if this
#                                       is set.
#
# }

######## Set up some variables for later {
#
# NOTE: If a variable is added here it should be unset at the end of the
# file!
#
# _debugging=1
#
# $- contains the options provided to the shell
[[ $- == *i* ]] && _shell_is_interactive=1

# }

# Make the first call on the local settings file
[ -r "${HOME}/.bashrc.local" ] && source "${HOME}/.bashrc.local" pre

# PATH manipulation was simplified, it probably shouldn't be touched at all
PATH=${PATH}:/usr/local/bin:${HOME}/.local/bin

######## Clean up the PATH {
#
# PATH and similar vars are cleaned by dropping non-existant dirs
# and duplicates while keeping the order
# 
function pathclean() {
    local -a newpathcomps # Array of new path components
    local -i alreadyseen  # Have we already seen this component?
    local component       # Current component we're looking at
    local -i i            # loop var
    local thevar=$1       # The NAME of the variable we're cleaning

    # Clean up the PATH
    # Expunge double /s and make : into a space. Unfortunatly, this breaks
    # on path entries with a space in them, as happens in the Cygwin/WSL
    # environments with the fabulous "Program Files" directory, so we have
    # to kludge spaces into | and then back again...
    #
    for component in $(echo "${!thevar}" | sed -e 's/ /|/g' -e 's/:/ /g' -e 's#//#/#g'); do
        if [[ -d "${component//|/ }" ]]; then
            # The directory exists, lets check we haven't already seen it
            alreadyseen=0
            i=0
            while ((i < ${#newpathcomps[*]})); do
                if [[ ${newpathcomps[i]} == "$component" ]]; then
                    alreadyseen=1
                    break
                fi
                ((i = i + 1))
            done
            if ((!alreadyseen)); then
                newpathcomps[i]=$component
            fi
        fi
    done
    # I'm just not game to wrap this line!
    eval "$thevar=\"$(echo "${newpathcomps[*]}" | sed -e's/ /:/g' -e 's/|/ /g')\""
}

pathclean PATH
pathclean MANPATH
pathclean LD_LIBRARY_PATH

export PATH MANPATH LD_LIBRARY_PATH

# }

######## Shell options {
#
# Set my preferred options
shopt -s autocd cdspell checkjobs checkwinsize cmdhist dirspell dotglob histreedit globstar histappend nocaseglob

# Also, disable flow control (Ctrl-S and Ctrl-Q) -- who wants that anyway?
stty -ixon

# If I hit <tab> on a blank line, I DON'T want to see a list of all the
# comands in my PATH - who would EVER want that??  This option appeared in
# bash 2.04, so it's not in the Solaris 8 version of bash.  Rather than
# checking for the version, check for the existance of the option:
[[ $(shopt) == *no_empty_cmd_completion* ]] &&
    shopt -s no_empty_cmd_completion

# Only put duplicate lines in the history once, and don't record in
# history commands that start with at least one space
HISTCONTROL=ignoreboth,erasedups
# }

######## This section is only for interactive shells {

if [[ $_shell_is_interactive == 1 ]]; then
    # Prompt and other terminal settings {

    # We need extglob turned on, so save the current value
    declare oldextglob=$(shopt extglob)
    shopt -s extglob

    # Declare some variables to work with
    # declare settitle
    declare red=$(tput setaf 1)
    declare green=$(tput setaf 2)
    declare blue=$(tput setaf 4)
    declare yellow=$(tput setaf 3)
    declare reset=$(tput sgr0)

    # set up complicated prompt stuff based on terminal type
    case $TERM in
    *rxvt* | dtterm* | st* | *xterm* | screen* | linux | tmux*)
        # These terminals have a title that can be set.
        # This magic came from one of the linux HOWTOs
        settitle='\[\033]0;\h: \w\007\]\h:\W\$ '
        case $TERM in
        *rxvt* | *xterm* | dtterm*)
            settitle="\[\033]0;\h: \w\007\]"
            ;;
        screen* | tmux*)
            #         # for screen/tmux I want to set the window title to 'local' on a localhost,
            #         # otherwise to ssh-dictated user@host line
            #         settitle='\[\033k\h\033\\\033]0;\w\007\]'
            settitle='\[\033klocal\033\\\]'
            ;;
        esac
        PS1=${settitle}'\[${yellow}\][\t] \[${green}\]\u@\h\[${reset}\] \[${blue}\]\W \[$(test "$?" -ne 0 && echo -ne ${red})\]\$ \[${reset}\]'
        ;;
    esac

    # Remove any exporting of PS1 since it looks hideous in other shells and
    # bash will just re-read this file anyway
    # export -n PS1
    PROMPT_COMMAND=${PROMPT_COMMAND=history -a}
    export PROMPT_COMMAND

    # set extglob back to how we found it
    [[ $oldextglob == *off ]] && shopt -u extglob
    unset oldextglob
    # }

    ######## Aliases {
    # Main aliases "rebash" and "realias" that help with profile development
    # Let me easily re-run this in case of a new installation or change to this
    # file. I know, how lazy is this?
    alias rebash='source ${HOME}/.bashrc'
    alias realias='source ${HOME}/.bashrc.aliases'

    # Put the rest of stuff that you want aliased in .bashrc.aliases file
    [ -r "${HOME}/.bashrc.aliases" ] && source "${HOME}/.bashrc.aliases"

    # }


fi # End of interactive-only section

# }

# Make the last call on the local settings file
[ -r "${HOME}/.bashrc.local" ] && source "${HOME}/.bashrc.local" post

######## Clean up
unset _shell_is_interactive
unset _debugging