* geesh/environment.scm (*return-tag*): New variable.
(call-with-return): New public function.
(sh:return): New public function.
(*atexit*): New variable.
(*exiting?*) New variable.
(set-atexit!): New public function.
(sh:exit): New public function.
* geesh/repl.scm (run-repl): Call sh:exit at the end of a script.
* geesh/shell.scm (sh:exec-let): Use call-with-return for functions.
* geesh/built-ins/dot.scm (main): Use call-with-return.
These names are too common, and it will be even worse with 'exit'
and 'return'.
* geesh/environment.scm (break): Rename this...
(sh:break) ...to this.
(continue): Rename this...
(sh:continue) ...to this.
* geesh/built-ins/break.scm (main): Update call.
* geesh/built-ins/continue.scm (main): Ditto.
* geesh/built-ins/utils.scm (get-evaluator): New public function.
* geesh/built-ins/dot.scm: New file.
* geesh/built-ins/eval.scm: New file.
* geesh/Makefile.am: Add them.
* geesh/built-ins.scm (*special-built-ins*): Add dot and eval.
* geesh/built-ins/set.scm (option?): New function.
(option-letter?): New function.
(set-option!): New function.
(main): Set or print options as specified by the given arguments.
* tests/spec/oil.scm: Filter out a redirect test that was only passing
because set did not work.
Instead of passing around references to the environment, just treat it
as a global. The old way was just the remains of an idea to make the
environment immutable and keep the interpreter from manipulating any
global state. By making everything global and mutable, we will have
less impedance mismatch with POSIX going forward.
The following changelog is only a sketch, since nearly every function
has changed.
* geesh/environment.scm: Replace this module with one that treats the
environment as a global resource.
* tests/environment.scm: Delete file.
* Makefile.am: Remove it from the list of tests.
* geesh/shell.scm, geesh/eval.scm, geesh/repl.scm, geesh/word.scm,
geesh/built-ins/break.scm, geesh/built-ins/continue.scm,
geesh/built-ins/echo.scm, geesh/built-ins/export.scm,
geesh/built-ins/false.scm, geesh/built-ins/read.scm,
geesh/built-ins/readonly.scm, geesh/built-ins/set.scm,
geesh/built-ins/true.scm, geesh/built-ins/unset.scm: Remove 'env'
parameters and use the new environment module.
* .dir-locals.el: Update indentation of functions that no longer take
an 'env' parameter and add with-arguments, with-environ, and
with-variables from the new environment module.
* tests/shell.scm, tests/word.scm: Update environment creation and
manipulation in tests.
* geesh/environment.scm (delete-environment-vars!): New public function.
(delete-environment-functions!): New public function.
* geesh/built-ins/unset.scm: New file.
* Makefile.am: Add it.
* geesh/built-ins.scm: Enable 'unset'.
* geesh/built-ins/echo.scm: New file.
* geesh/built-ins.scm: New file.
* Makefile.scm: Add them.
* geesh/shell.scm (exec-let): Include built-ins in command search.
* tests/shell.scm: Add a test for this.