dot/shell-rc, etc.: Introduce an easily user-definable prompt section.

[profile] / dot / bashrc

### -*-bash-*-
###
### Bash session things.

__mdw_shell=bash

## Only do this if we haven't done it before.  (Note that this guard isn't
## exported, so subshells will need to make their own arrangements.)
case ${__mdw_bashrc+t} in
  t) ;;
  *) __mdw_bashrc=t

###--------------------------------------------------------------------------
### Hook implementation.

__mdw_precmd_hook= __mdw_preexec_hook=
__mdw_running=t

__mdw_run_precmd_hook () {
  __mdw_runhook __mdw_precmd_hook "$@"
  __mdw_running=nil
}
__mdw_run_preexec_hook () {
  case $__mdw_running in
    t) ;;
    nil)
      __mdw_running=t;
      set -- $(history 1); shift
      __mdw_runhook __mdw_preexec_hook "$*"
      ;;
  esac
}

PROMPT_COMMAND=__mdw_run_precmd_hook
trap __mdw_run_preexec_hook DEBUG

###--------------------------------------------------------------------------
### Common shell configuration.

. "$HOME/.shell-rc"

###--------------------------------------------------------------------------
### Other preliminaries.

## If we've not run the main profile yet, we should do that first.  It sets
## up things we rely on.  Also, if there's a system script, we should run
## that too.
case ${__mdw_profile+t} in t) ;; *) . "$HOME/.profile" ;; esac
__mdw_source_if_exists /etc/bashrc

## Completion.
__mdw_source_if_exists /etc/bash_completion "$HOME/.bash_completion"

###--------------------------------------------------------------------------
### Prompt hacking.

__mdw_set_prompt_hacks () {
  case "$TERM" in
    linux*|screen*|xterm*|putty*|vt100*|eterm*)
      case "$(tput bold)" in
	"") bold="\[$(tput md)\]" unbold="\[$(tput me)\]" ;;
	*) bold="\[$(tput bold)\]" unbold="\[$(tput sgr0)\]" ;;
      esac
      gitcolour="\[$(tput setaf 6)\]"
      extracolour="\[$(tput setaf 3)\]"
      rccolour="\[$(tput setaf 1)\]"
      uncolour="\[$(tput op)\]"
      nl="\[\r\]"
      ;;
  esac
  host='\h' dir=' \w'
}

## Only bother if the shell is interactive.
if [ -t 0 ]; then
  PROMPT_DIRTRIM=5
  __mdw_source_if_exists /usr/lib/git-core/git-sh-prompt
  __mdw_set_prompt_pieces
fi

###--------------------------------------------------------------------------
### Other shell tweaking.

## Random shell tweaks.
notify=1
set -b
shopt -u cdable_vars
shopt -s cdspell
shopt -s checkhash
shopt -s checkwinsize
shopt -s cmdhist
shopt -u dotglob
shopt -s expand_aliases
shopt -s extglob
if (( ${BASH_VERSINFO[0]} >= 4 )); then shopt -s globstar; fi
shopt -s gnu_errfmt
shopt -s histappend
set -o histexpand
shopt -s histreedit
shopt -u histverify
shopt -s hostcomplete
shopt -s huponexit
shopt -s interactive_comments
shopt -s lithist
shopt -u mailwarn
shopt -u nocaseglob
shopt -u nullglob
shopt -s promptvars
shopt -u shift_verbose
shopt -s sourcepath
HISTCONTROL=ignorespace:erasedups

###--------------------------------------------------------------------------
### Finishing touches.

## Run any local hooks.
__mdw_source_if_exists "$HOME/.bashrc-local"

###----- That's all, folks --------------------------------------------------

esac