217 lines
3.5 KiB
Org Mode
217 lines
3.5 KiB
Org Mode
;;; Gash -- Guile As SHell
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;;; Copyright © 2019 Timothy Sample <samplet@ngyro.com>
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;;;
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;;; This file is part of Gash.
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;;;
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;;; Gash is free software: you can redistribute it and/or modify
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;;; it under the terms of the GNU General Public License as published by
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;;; the Free Software Foundation, either version 3 of the License, or
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;;; (at your option) any later version.
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;;;
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;;; Gash is distributed in the hope that it will be useful,
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;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;;; GNU General Public License for more details.
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;;;
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;;; You should have received a copy of the GNU General Public License
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;;; along with Gash. If not, see <http://www.gnu.org/licenses/>.
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;; Special built-ins
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* Assignments escape special built-ins
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:script:
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#+begin_src sh
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eval 'X=foo'
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echo $X
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#+end_src
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:stdout:
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#+begin_example
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foo
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#+end_example
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* Temporary assignments escape special built-ins
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:script:
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#+begin_src sh
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X=bar eval 'X=foo'
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echo $X
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#+end_src
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:stdout:
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#+begin_example
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foo
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#+end_example
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* Updates of temporary assignments escape special built-ins
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:script:
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#+begin_src sh
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X=foo
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X=bar eval 'X=baz'
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echo $X
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#+end_src
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:stdout:
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#+begin_example
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baz
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#+end_example
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* Temporary assignments are not exported in special built-ins
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:script:
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#+begin_src sh
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X=foo eval 'guile -c '\''(format #t "~a~%" (getenv "X"))'\'
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#+end_src
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:stdout:
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#+begin_example
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#f
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#+end_example
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* Temporary exports do not escape special built-ins
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:script:
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#+begin_src sh
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X=bar
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X=foo :
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guile -c '(format #t "~a~%" (getenv "X"))'
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#+end_src
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:stdout:
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#+begin_example
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#f
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#+end_example
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* Exports escape special built-ins
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:script:
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#+begin_src sh
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X=foo
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eval 'export X'
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guile -c '(format #t "~a~%" (getenv "X"))'
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#+end_src
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:stdout:
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#+begin_example
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foo
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#+end_example
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* Exports of temporary assignments escape special built-ins
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:script:
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#+begin_src sh
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X=foo eval 'export X'
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guile -c '(format #t "~a~%" (getenv "X"))'
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#+end_src
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:stdout:
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#+begin_example
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foo
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#+end_example
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;; Functions
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* Assignments escape functions
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:script:
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#+begin_src sh
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f() {
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X=foo
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}
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f
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echo $X
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#+end_src
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:stdout:
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#+begin_example
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foo
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#+end_example
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* Temporary assignments do not escape functions
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:script:
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#+begin_src sh
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f() {
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X=foo
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}
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X=bar f
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echo $X
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#+end_src
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:stdout:
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#+begin_example
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#+end_example
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* Updates of temporary assignments do not escape functions
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:script:
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#+begin_src sh
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f() {
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X=baz
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}
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X=foo
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X=bar f
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echo $X
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#+end_src
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:stdout:
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#+begin_example
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foo
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#+end_example
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* Temporary assignments are not exported in functions
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:script:
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#+begin_src sh
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f() {
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guile -c '(format #t "~a~%" (getenv "X"))'
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}
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X=foo f
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#+end_src
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:stdout:
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#+begin_example
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#f
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#+end_example
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* Temporary exports do not escape functions
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:script:
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#+begin_src sh
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f() {
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:
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}
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X=bar
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X=foo f
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guile -c '(format #t "~a~%" (getenv "X"))'
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#+end_src
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:stdout:
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#+begin_example
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#f
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#+end_example
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* Exports escape functions
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:script:
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#+begin_src sh
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f() {
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export X
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}
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X=foo
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f
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guile -c '(format #t "~a~%" (getenv "X"))'
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#+end_src
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:stdout:
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#+begin_example
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foo
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#+end_example
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* Exports of temporary assignments do not escape functions
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:script:
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#+begin_src sh
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f() {
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export X
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}
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X=foo f
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guile -c '(format #t "~a~%" (getenv "X"))'
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#+end_src
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:stdout:
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#+begin_example
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#f
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#+end_example
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* Read-only temporary assignments do not escape functions
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:script:
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#+begin_src sh
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f() {
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readonly X
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}
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X=foo f
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echo $X
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#+end_src
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:stdout:
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#+begin_example
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#+end_example
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