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;;; Consfigurator -- Lisp declarative configuration management system
;;; Copyright (C) 2021, 2023 Sean Whitton <spwhitton@spwhitton.name>
;;; This file 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, or (at your option)
;;; any later version.
;;; This file 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 this program. If not, see <https://www.gnu.org/licenses/>.
(in-package :consfigurator)
(defun lines (text &optional trimfun (trimchars '(#\Space #\Tab)))
(with-input-from-string (stream text)
(let (bolp buffer)
(flet ((trim (line)
(if trimfun (funcall trimfun trimchars line) line))
(reset ()
(setq bolp t
buffer (make-array 0 :fill-pointer 0
:element-type 'character))))
;; Split on either <CR>, <LF> or <CR><LF>; <LF><CR> would mean split
;; with a blank line in between. Drop a single trailing blank line.
(loop initially (reset)
for char = (read-char stream nil nil)
if char
if (member char '(#\Return #\Newline) :test #'char=)
collect (trim buffer)
and do (reset)
(when (char= char #\Return)
(when-let ((next (peek-char nil stream nil nil)))
(when (char= next #\Newline)
(read-char stream))))
else do (setq bolp nil)
(vector-push-extend char buffer)
end
else
unless bolp collect (trim buffer) end
and do (loop-finish))))))
(defun unlines (lines)
(format nil "~{~A~%~}" lines))
(defun read-heredoc (stream char arg)
"Like CL-HEREDOC:READ-HEREDOC, with some additional features.
Treat #>EOF> and #>>EOF>> differently: #>>EOF>> skips over the remainder of
the current line and its newline. For the sake of future extension, the
remainder of the line after the #>>EOF>> must not contain anything other than
a single-line comment.
Preceding the specification of the terminating string with a tilde means an
indented heredoc; see perlop(1)."
(declare (ignore arg))
(let* ((>> (and (char= char (peek-char nil stream t :eof t))
(read-char stream t :eof t)))
(indented (and (char= #\~ (peek-char nil stream t :eof t))
(read-char stream t :eof t)))
(delim (if >> (make-string 2 :initial-element char) (string char)))
(ender (cl-heredoc:read-until-match stream delim)))
(when >>
(read-line stream t :eof t))
(let ((heredoc (cl-heredoc:read-until-match stream ender)))
(if indented
(loop with lines = (lines heredoc)
with indent = (length (lastcar lines))
for (line . rest) on lines while rest
collect (subseq line (min indent (length line))) into accum
finally (return (unlines accum)))
heredoc))))
(named-readtables:defreadtable :consfigurator
(:merge :standard)
(:dispatch-macro-char #\# #\? #'cl-interpol:interpol-reader)
(:dispatch-macro-char #\# #\> #'read-heredoc))
(named-readtables:defreadtable :consfigurator.without-read-eval
(:merge :consfigurator)
(:dispatch-macro-char #\# #\. (constantly nil)))
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