.shellrc_dispatch

#!/bin/bash

# Launch different bash configuration for Linux vs OSX, interactive vs batch
#
# More info at https://github.com/josephwecker/bashrc_dispatch
#
# License: Public Domain.
# Author:  Joseph Wecker, 2012

# Configuration
# -------------
#
# EXPORT_FUNCTIONS: export SHELL_PLATFORM and shell_is_* functions for use
#                   in other scripts.
EXPORT_FUNCTIONS=""
[ -n "$BASH" ] && EXPORT_FUNCTIONS="true"

# Code
# ----

# Avoid recursive invocation
[ -n "$SHELL_DISPATCH_PID" ] && [ $$ -eq "$SHELL_DISPATCH_PID" ] && return
SHELL_DISPATCH_PID=$$

# Setup the main shell variables and functions
if [ -z "$SHELL_PLATFORM" ]; then
    SHELL_PLATFORM='OTHER'
    case "$OSTYPE" in
      *'linux'*   ) SHELL_PLATFORM='LINUX' ;;
      *'darwin'*  ) SHELL_PLATFORM='OSX' ;;
      *'freebsd'* ) SHELL_PLATFORM='BSD' ;;
    esac
fi

if ! type shell_is_login >/dev/null 2>&1; then
  shell_is_linux       () { [[ "$OSTYPE" == *'linux'* ]] ; }
  shell_is_osx         () { [[ "$OSTYPE" == *'darwin'* ]] ; }
  shell_is_login       () { if [ -n "$BASH" ]; then shopt -q login_shell; else [[ -o login ]]; fi }
  shell_is_interactive () { test -n "$PS1" ; }
  shell_is_script      () { ! shell_is_interactive ; }
fi

shell_dispatch_brief() {
    #echo "Brief: $@"
    true
}

# Make $BASH_ENV the same in interactive and non-interactive scripts
[ -z "$BASH_ENV" ] && export BASH_ENV="$BASH_SOURCE"

# Make these available to the potentially convoluted shell_* startup scripts
if [ -n "$EXPORT_FUNCTIONS" ]; then
    export SHELL_PLATFORM
    export -f shell_is_linux
    export -f shell_is_osx
    export -f shell_is_login
    export -f shell_is_interactive
    export -f shell_is_script
fi

# Now dispatch special files
PRF="${HOME}/.shellrc"
[ -f "${PRF}_once"  ]       && [ -z "$BRCD_RANONCE" ] && shell_dispatch_brief "exe_once" && . "${PRF}_once"  && export BRCD_RANONCE=true
[ -f "${PRF}_all" ]                                   && shell_dispatch_brief "exe_all" && . "${PRF}_all"
[ -f "${PRF}_script" ]      && shell_is_script        && shell_dispatch_brief "exe_script" && . "${PRF}_script"
[ -f "${PRF}_interactive" ] && shell_is_interactive   && shell_dispatch_brief "exe_interative" && . "${PRF}_interactive"
[ -f "${PRF}_login" ]       && shell_is_login         && shell_dispatch_brief "exe_login" && . "${PRF}_login"

# Unset variables if necessary to avoid env polution
if ! $EXPORT_FUNCTIONS ; then
    unset SHELL_PLATFORM
    unset -f shell_is_linux
    unset -f shell_is_osx
    unset -f shell_is_login
    unset -f shell_is_interactive
    unset -f shell_is_script
fi

# Unset local variables
unset fn_cmd
unset EXPORT_FUNCTIONS
unset SHELL_DISPATCH_PID
unset PRF