;;; Gash -- Guile As SHell
;;; Copyright © 2016, 2017, 2018 R.E.W. van Beusekom <rutger.van.beusekom@gmail.com>
;;; Copyright © 2018, 2019 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
;;; Copyright © 2019 Timothy Sample <samplet@ngyro.com>
;;;
;;; This file is part of Gash.
;;;
;;; Gash is free software: you can redistribute it and/or modify
;;; it under the terms of the GNU General Public License as published by
;;; the Free Software Foundation, either version 3 of the License, or
;;; (at your option) any later version.
;;;
;;; Gash is distributed in the hope that it will be useful,
;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;;; GNU General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with Gash.  If not, see <http://www.gnu.org/licenses/>.

* variable-not-or
:script:
#+begin_src sh
  foo=baz
  echo ${foo-bar}
#+end_src
:stdout:
#+begin_example
  baz
#+end_example

* variable-or-doublequote
:script:
#+begin_src sh
  CPPFLAGS=${CPPFLAGS-"
  -I ${srcdest}src
  "}
  echo $CPPFLAGS
#+end_src
:stdout:
#+begin_example
  -I src
#+end_example

* variable-or-empty
:script:
#+begin_src sh
  echo ${bindir-}
#+end_src
:stdout:
#+begin_example
  
#+end_example

* variable-or
:script:
#+begin_src sh
  echo ${foo-bar}
#+end_src
:stdout:
#+begin_example
  bar
#+end_example

* variable-or-slash
:script:
#+begin_src sh
  echo ${foo-bar/}
#+end_src

* variable-or-variable
:script:
#+begin_src sh
  prefix=/usr
  echo ${bindir-$prefix/bin}
#+end_src
:stdout:
#+begin_example
  /usr/bin
#+end_example