lib.c (subst): Finish the half-baked comment explaining `delimtab'.

[runlisp] / runlisp-base.conf

;;; -*-conf-windows-*-

;; This file contains essential definitions for `runlisp'.  You are
;; encouraged to put your local changes in the main `runlisp.conf', or in
;; other files alongside this one in `runlisp.d/', rather then editing this
;; file.

;; Summary of syntax.
;;
;; Sections are started with a line `[NAME]', starting in the leftmost
;; column.  Empty lines and lines starting with `;' -- /without/ preceding
;; whitespace -- are ignored.  Assignments have the form `VAR = VALUE'; the
;; VALUE may be continued across multiple lines, if they begin with
;; whitespace.  All of the lines are stripped of initial and final whitespace
;; and concatenated with spaces.
;;
;; Values may contain substitutions:
;;
;;   * ${[SECTION:]VAR[?ALT]} -- replace with the value of VAR in SECTION; if
;;     not found, use ALT instead.  (If ALT isn't provided, it's an error.)
;;
;;   * $?[SECTION:]VAR{YES[|NO]} -- look up VAR in SECTION (or in the
;;     (original) current section, and `@COMMON'); if found, use YES,
;;     otherwise use NO.
;;
;; Variables are looked up starting in the home (or explicitly specified)
;; section, then proceeding to the parents assigned to `@PARENTS'.
;; (`@PARENTS' usually defaults to `@COMMON'; the parent of `@COMMON' is
;; `@BUILTIN'; `@BUILTIN' and `@CONFIG' have no parents.)
;;
;; At top-level, the text is split into words at whitespace, unless prevented
;; by double- and single-quote, or escaped by `\'.  Within single quotes, all
;; characters are treated literally.  Within double quotes, `\' and `$' still
;; works.  A variable reference within quotes, or within a word, suppresses
;; word-splitting and quoting, within the variable value -- but `$'
;; expansions still work.

;;;--------------------------------------------------------------------------
[@COMMON]

;; Turn `#!' into a comment-to-end-of-line.  This is used in all Lisp
;; invocations, even though some of them don't apparently need it.  For
;; example, SBCL ignores an initial line beginning `#!' as a special feature
;; of its `--script' option.  Other Lisps won't do this, so a countermeasure
;; like the following is necessary in their case.  For the sake of a
;; consistent environment, we ignore `#!' lines everywhere, even in Lisps
;; which have their own, more specific, solution to this problem.
ignore-shebang =
	(set-dispatch-macro-character
	 #\\# #\\!
	 (lambda (#1=#:stream #2=#:char #3=#:arg)
	   (declare (ignore #2# #3#))
	   (values (read-line #1#))))

;; Clear all present symbols from the `COMMON-LISP-USER' package.  Some Lisps
;; leave débris in `COMMON-LISP-USER' -- for example, ECL leaves some
;; allegedly useful symbols lying around, while ABCL has a straight-up bug in
;; its `adjoin.lisp' file.
clear-cl-user =
	(let ((#4=#:pkg (find-package "COMMON-LISP-USER")))
	  (with-package-iterator (#5=#:next #4# :internal)
	    (loop (multiple-value-bind (#6=#:anyp #7=#:sym #8=#:how)
		      (#5#)
		    (declare (ignore #8#))
		    (unless #6# (return))
		    (unintern #7# #4#)))))

;; Add `:runlisp-script' to `*features*' so that scripts can tell whether
;; they're supposed to sit quietly and be debugged in a Lisp session or run
;; as a script.
set-script-feature =
	(pushnew :runlisp-script *features*)

;; Load the system's ASDF.
require-asdf =
	(require "asdf")

;; Prevent ASDF from upgrading itself.  Otherwise it will do this
;; automatically if a script invokes `asdf:load-system', but that will have a
;; bad effect on startup time, and risks spamming the output streams with
;; drivel.
inhibit-asdf-upgrade =
	(funcall (intern "REGISTER-IMMUTABLE-SYSTEM"
			 (find-package "ASDF"))
		 "asdf")

;; Upgrade ASDF from the source registry.
upgrade-asdf =
	(funcall (intern "UPGRADE-ASDF" (find-package "ASDF")))

;; Common actions when resuming a custom image.
image-restore =
	(uiop:call-image-restore-hook)

;; Common prelude for script startup in vanilla images.  Most of this is
;; already done in custom images.
run-script-prelude =
	(progn
	  (setf *load-verbose* nil *compile-verbose* nil)
	  ${require-asdf}
	  ${inhibit-asdf-upgrade}
	  ${ignore-shebang}
	  ${set-script-feature})

;; Common prelude for dumping images.
dump-image-prelude =
	(progn
	  ${require-asdf}
	  ${upgrade-asdf}
	  ${inhibit-asdf-upgrade}
	  ${ignore-shebang}
	  ${set-script-feature})

;; Full pathname to custom image.
image-path = ${@image-dir}/${image-file}

;;;--------------------------------------------------------------------------
[sbcl]

command = ${@ENV:SBCL?sbcl}
image-file = ${@name}+asdf.core

run-script =
	${command} --noinform
		$?@image{--core "${image-path}" --eval "${image-restore}" |
			 --eval "${run-script-prelude}"}
		--script "${@script}"

dump-image =
	${command} --noinform --no-userinit --no-sysinit --disable-debugger
		--eval "${dump-image-prelude}"
		--eval "(sb-ext:save-lisp-and-die \"${@image-new|q}\")"

;;;--------------------------------------------------------------------------
[ccl]

command = ${@ENV:CCL?ccl}
image-file = ${@name}+asdf.image

run-script =
	${command} -b -n -Q
		$?@image{-I "${image-path}" -e "${image-restore}" |
			 -e "${run-script-prelude}"}
		-l "${@script}" -e "(ccl:quit)" --

;; A snaglet occurs here.  CCL wants to use the image name as a clue to where
;; the rest of its installation is; but in fact the image is nowhere near its
;; installation.  So we must hack...
dump-image =
	${command} -b -n -Q
		-e "${dump-image-prelude}"
		-e "(ccl::in-development-mode
		      (let ((#1=#:real-ccl-dir (ccl::ccl-directory)))
			(defun ccl::ccl-directory ()
			  (let* ((#2=#:dirpath
				   (ccl:getenv \"CCL_DEFAULT_DIRECTORY\")))
			    (if (and #2# (plusp (length (namestring #2#))))
				(ccl::native-to-directory-pathname #2#)
				#1#))))
		      (compile 'ccl::ccl-directory))"
		-e "(ccl:save-application \"${@image-new|q}\"
					  :init-file nil
					  :error-handler :quit)"

;;;--------------------------------------------------------------------------
[clisp]

;; CLisp causes much sadness.  Superficially, it's the most sensible of all
;; of the systems supported here: you just run `clisp SCRIPT -- ARGS ...' and
;; it works.
;;
;; The problems come when you want to do some preparatory work (e.g., load
;; `asdf') and then run the script.  There's a `-x' option to evaluate some
;; Lisp code, but it has three major deficiencies.
;;
;;   * It insists on printing the values of the forms it evaluates.  It
;;     prints a blank line even if the form goes out of its way to produce no
;;     values at all.  So the whole thing has to be a single top-level form
;;     which quits the Lisp rather than returning.
;;
;;   * For some idiotic reason, you can have /either/ `-x' forms /or/ a
;;     script, but not both.  So we have to include the `load' here
;;     explicitly.  I suppose that was inevitable because we have to inhibit
;;     printing of the result forms, but it's still a separate source of
;;     annoyance.
;;
;;   * The icing on the cake: the `-x' forms are collectively concatenated --
;;     without spaces! -- and used to build a string stream, which is then
;;     assigned over the top of `*standard-input*', making the original stdin
;;     somewhat fiddly to track down.
;;
;; There's a `-i' option which will load a file without any of this
;; stupidity, but nothing analogous for immediate expressions.

clisp-common-startup =
	(setf *standard-input* (ext:make-stream :input))
	(load "${@script|q}" :verbose nil :print nil)
	(ext:quit)

command = ${@ENV:CLISP?clisp}
image-file = ${@name}+asdf.mem

run-script =
	${command}
		$?@image{-M "${image-path}" -q
			 -x "(progn
			       ${image-restore}
			       ${clisp-common-startup})" |
			 -norc -q
			 -x "(progn
			       ${run-script-prelude}
			       ${clisp-common-startup})"}
		--

dump-image =
	${command} -norc -q -q
		-x "${dump-image-prelude}"
		-x "(ext:saveinitmem \"${@image-new|q}\" :norc t :script t)"

;;;--------------------------------------------------------------------------
[ecl]

command = ${@ENV:ECL?ecl}
image-file = ${@name}+asdf

run-script =
	$?@image{"${image-path}" -s "${@script}" |
		 ${@ENV:ECL?ecl} "${@ecl-opt}norc"
			 "${@ecl-opt}eval" "(progn
					    ${run-script-prelude}
					    ${clear-cl-user})"
			 "${@ecl-opt}shell" "${@script}"}
		--

dump-image =
	"${@data-dir}/dump-ecl"
		"${@image-new}" "${command}" "${@ecl-opt}" "${@tmp-dir}"

;;;--------------------------------------------------------------------------
[cmucl]

command = ${@ENV:CMUCL?cmucl}
image-file = ${@name}+asdf.core

run-script =
	${command}
		$?@image{-core "${image-path}" -eval "${image-restore}" |
			 -batch -noinit -nositeinit -quiet
				 -eval "(progn
					  (setf ext:*require-verbose* nil)
					  ${run-script-prelude})"}
		-load "${@script}" -eval "(ext:quit)" --

dump-image =
	${command} -batch -noinit -nositeinit -quiet
		-eval "${dump-image-prelude}"
		-eval "(ext:save-lisp \"${@image-new|q}\"
				      :batch-mode t :print-herald nil
				      :site-init nil :load-init-file nil)"

;;;--------------------------------------------------------------------------
[abcl]

;; CLisp made a worthy effort, but ABCL still manages to take the prize.
;;
;;   * ABCL manages to avoid touching the `stderr' stream at all, ever.  Its
;;     startup machinery finds `stdout' (as `java.lang.System.out'), wraps it
;;     up in a Lisp stream, and uses the result as `*standard-output*' and
;;     `*error-output*' (and a goodly number of other things too).  So we
;;     must manufacture a working `stderr' the hard way.
;;
;;   * There doesn't appear to be any easy way to prevent toplevel errors
;;     from invoking the interactive debugger.  For extra fun, the debugger
;;     reads from `stdin' by default, so an input file which somehow manages
;;     to break the script can then take over its brain by providing Lisp
;;     forms for the debugger to evaluate.
;;
;;   * And, just to really top everything off, ABCL's `adjoin.lisp' is
;;     missing an `(in-package ...)' form at the top, so it leaks symbols
;;     into the `COMMON-LISP-USER' package.

command = ${@ENV:ABCL?abcl}

abcl-startup =
	(let ((#9=#:script "${@script|q}"))
	  ${run-script-prelude}
	  ${clear-cl-user}
	  (setf *error-output*
		  (java:jnew "org.armedbear.lisp.Stream"
			     \'sys::system-stream
			     (java:jfield "java.lang.System" "err")
			     \'character
			     java:+true+))
	  (handler-case (load #9# :verbose nil :print nil)
	    (error (error)
	      (format *error-output* "~A (unhandled error): ~A~%" #9# error)
	    (ext:quit :status 255))))

run-script =
	${command} --batch --noinform --noinit --nosystem
		--eval "${abcl-startup}"
		--

;;;----- That's all, folks --------------------------------------------------