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diff --git a/elisp/geiser-guile.el b/elisp/geiser-guile.el
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-;;; geiser-guile.el -- guile's implementation of the geiser protocols
-
-;; Copyright (C) 2009-2018, 2020 Jose Antonio Ortega Ruiz
-;; Copyright (C) 2017 Jan Nieuwenhuizen <janneke@gnu.org>
-
-;; This program is free software; you can redistribute it and/or
-;; modify it under the terms of the Modified BSD License. You should
-;; have received a copy of the license along with this program. If
-;; not, see <http://www.xfree86.org/3.3.6/COPYRIGHT2.html#5>.
-
-;; Start date: Sun Mar 08, 2009 23:03
-
-
-;;; Code:
-
-(require 'geiser-connection)
-(require 'geiser-syntax)
-(require 'geiser-custom)
-(require 'geiser-base)
-(require 'geiser-eval)
-(require 'geiser-edit)
-(require 'geiser-log)
-(require 'geiser)
-
-(require 'compile)
-(require 'info-look)
-
-(eval-when-compile (require 'cl-lib))
-
-
-;;; Customization:
-
-(defgroup geiser-guile nil
-  "Customization for Geiser's Guile flavour."
-  :group 'geiser)
-
-(geiser-custom--defcustom geiser-guile-binary
-    (cond ((eq system-type 'windows-nt) "guile.exe")
-          ((eq system-type 'darwin) "guile")
-          (t "guile"))
-  "Name to use to call the Guile executable when starting a REPL."
-  :type '(choice string (repeat string))
-  :group 'geiser-guile)
-
-(geiser-custom--defcustom geiser-guile-load-path nil
-  "A list of paths to be added to Guile's load path when it's started.
-The paths are added to both %load-path and %load-compiled path,
-and only if they are not already present.  This variable is a
-good candidate for an entry in your project's .dir-locals.el."
-  :type '(repeat file)
-  :group 'geiser-guile)
-
-(geiser-custom--defcustom geiser-guile-init-file "~/.guile-geiser"
-  "Initialization file with user code for the Guile REPL.
-If all you want is to load ~/.guile, set
-`geiser-guile-load-init-file-p' instead."
-  :type 'string
-  :group 'geiser-guile)
-
-(geiser-custom--defcustom geiser-guile-load-init-file-p nil
-  "Whether to load ~/.guile when starting Guile.
-Note that, due to peculiarities in the way Guile loads its init
-file, using `geiser-guile-init-file' is not equivalent to setting
-this variable to t."
-  :type 'boolean
-  :group 'geiser-guile)
-
-(geiser-custom--defcustom geiser-guile-debug-show-bt-p nil
-  "Whether to automatically show a full backtrace when entering the debugger.
-If `nil', only the last frame is shown."
-  :type 'boolean
-  :group 'geiser-guile)
-
-(geiser-custom--defcustom geiser-guile-jump-on-debug-p nil
-  "Whether to automatically jump to error when entering the debugger.
-If `t', Geiser will use `next-error' to jump to the error's location."
-  :type 'boolean
-  :group 'geiser-guile)
-
-(geiser-custom--defcustom geiser-guile-show-debug-help-p t
-  "Whether to show brief help in the echo area when entering the debugger."
-  :type 'boolean
-  :group 'geiser-guile)
-
-(geiser-custom--defcustom geiser-guile-warning-level 'medium
-  "Verbosity of the warnings reported by Guile.
-
-You can either choose one of the predefined warning sets, or
-provide a list of symbols identifying the ones you want. Possible
-choices are arity-mismatch, unbound-variable, unused-variable and
-unused-toplevel. Unrecognised symbols are ignored.
-
-The predefined levels are:
-
-  - Medium: arity-mismatch, unbound-variable, format
-  - High: arity-mismatch, unbound-variable, unused-variable, format
-  - None: no warnings
-
-Changes to the value of this variable will automatically take
-effect on new REPLs. For existing ones, use the command
-\\[geiser-guile-update-warning-level]."
-  :type '(choice (const :tag "Medium (arity and unbound vars)" medium)
-                 (const :tag "High (also unused vars)" high)
-                 (const :tag "No warnings" none)
-                 (repeat :tag "Custom" symbol))
-  :group 'geiser-guile)
-
-(geiser-custom--defcustom geiser-guile-extra-keywords nil
-  "Extra keywords highlighted in Guile scheme buffers."
-  :type '(repeat string)
-  :group 'geiser-guile)
-
-(geiser-custom--defcustom geiser-guile-case-sensitive-p t
-  "Non-nil means keyword highlighting is case-sensitive."
-  :type 'boolean
-  :group 'geiser-guile)
-
-(geiser-custom--defcustom geiser-guile-manual-lookup-other-window-p nil
-  "Non-nil means pop up the Info buffer in another window."
-  :type 'boolean
-  :group 'geiser-guile)
-
-(geiser-custom--defcustom geiser-guile-manual-lookup-nodes
-    '("Guile" "guile-2.0")
-  "List of info nodes that, when present, are used for manual lookups"
-  :type '(repeat string)
-  :group 'geiser-guile)
-
-
-;;; REPL support:
-
-(defun geiser-guile--binary ()
-  (if (listp geiser-guile-binary)
-      (car geiser-guile-binary)
-    geiser-guile-binary))
-
-(defun geiser-guile--parameters ()
-  "Return a list with all parameters needed to start Guile.
-This function uses `geiser-guile-init-file' if it exists."
-  (let ((init-file (and (stringp geiser-guile-init-file)
-                        (expand-file-name geiser-guile-init-file)))
-        (q-flags (and (not geiser-guile-load-init-file-p) '("-q"))))
-    `(,@(and (listp geiser-guile-binary) (cdr geiser-guile-binary))
-      ,@q-flags "-L" ,(expand-file-name "guile/" geiser-scheme-dir)
-      ,@(apply 'append (mapcar (lambda (p) (list "-L" p))
-                               geiser-guile-load-path))
-      ,@(and init-file (file-readable-p init-file) (list "-l" init-file)))))
-
-;;(defconst geiser-guile--prompt-regexp "^[^() \n]+@([^)]*?)> ")
-(defconst geiser-guile--prompt-regexp "[^@()]+@([^)]*?)> ")
-(defconst geiser-guile--debugger-prompt-regexp
-  "[^@()]+@([^)]*?) \\[[0-9]+\\]> ")
-
-
-;;; Evaluation support:
-(defsubst geiser-guile--linearize-args (args)
-  (mapconcat 'identity args " "))
-
-(defun geiser-guile--geiser-procedure (proc &rest args)
-  (cl-case proc
-    ((eval compile) (format ",geiser-eval %s %s%s"
-                            (or (car args) "#f")
-                            (geiser-guile--linearize-args (cdr args))
-                            (if (cddr args) "" " ()")))
-    ((load-file compile-file) (format ",geiser-load-file %s" (car args)))
-    ((no-values) ",geiser-no-values")
-    (t (format "ge:%s (%s)" proc (geiser-guile--linearize-args args)))))
-
-(defconst geiser-guile--module-re
-  "(define-module +\\(([^)]+)\\)")
-
-(defconst geiser-guile--library-re
-  "(library +\\(([^)]+)\\)")
-
-(defun geiser-guile--get-module (&optional module)
-  (cond ((null module)
-         (save-excursion
-           (geiser-syntax--pop-to-top)
-           (if (or (re-search-backward geiser-guile--module-re nil t)
-                   (looking-at geiser-guile--library-re)
-                   (re-search-forward geiser-guile--module-re nil t))
-               (geiser-guile--get-module (match-string-no-properties 1))
-             :f)))
-        ((listp module) module)
-        ((stringp module)
-         (condition-case nil
-             (car (geiser-syntax--read-from-string module))
-           (error :f)))
-        (t :f)))
-
-(defun geiser-guile--module-cmd (module fmt &optional def)
-  (when module
-    (let* ((module (geiser-guile--get-module module))
-           (module (cond ((or (null module) (eq module :f)) def)
-                         (t (format "%s" module)))))
-      (and module (format fmt module)))))
-
-(defun geiser-guile--import-command (module)
-  (geiser-guile--module-cmd module ",use %s"))
-
-(defun geiser-guile--enter-command (module)
-  (geiser-guile--module-cmd module ",m %s" "(guile-user)"))
-
-
-(defun geiser-guile--exit-command () ",q")
-
-(defun geiser-guile--symbol-begin (module)
-  (if module
-      (max (save-excursion (beginning-of-line) (point))
-           (save-excursion (skip-syntax-backward "^(>") (1- (point))))
-    (save-excursion (skip-syntax-backward "^'-()>") (point))))
-
-
-;;; Error display
-
-(defun geiser-guile--enter-debugger ()
-  (let ((bt-cmd (format ",geiser-newline\n,error-message\n,%s\n"
-                        (if geiser-guile-debug-show-bt-p "bt" "fr"))))
-    (compilation-forget-errors)
-    (goto-char (point-max))
-    (geiser-repl--prepare-send)
-    (comint-send-string nil bt-cmd)
-    (when geiser-guile-show-debug-help-p
-      (message "Debug REPL. Enter ,q to quit, ,h for help."))
-    (when geiser-guile-jump-on-debug-p
-      (accept-process-output (get-buffer-process (current-buffer))
-                             0.2 nil t)
-      (ignore-errors (next-error)))))
-
-(defun geiser-guile--display-error (module key msg)
-  (when (stringp msg)
-    (save-excursion (insert msg))
-    (geiser-edit--buttonize-files))
-  (and (not key) (not (zerop (length msg))) msg))
-
-
-;;; Trying to ascertain whether a buffer is Guile Scheme:
-
-(defconst geiser-guile--guess-re
-  (format "\\(%s\\|#! *.+\\(/\\| \\)guile\\( *\\\\\\)?\\)"
-          geiser-guile--module-re))
-
-(defun geiser-guile--guess ()
-  (save-excursion
-    (goto-char (point-min))
-    (re-search-forward geiser-guile--guess-re nil t)))
-
-
-;;; Keywords and syntax
-
-(defconst geiser-guile--builtin-keywords
-  '("call-with-input-file"
-    "call-with-input-string"
-    "call-with-output-file"
-    "call-with-output-string"
-    "call-with-prompt"
-    "call-with-trace"
-    "define-accessor"
-    "define-class"
-    "define-enumeration"
-    "define-inlinable"
-    "define-syntax-parameter"
-    "eval-when"
-    "lambda*"
-    "syntax-parameterize"
-    "use-modules"
-    "with-error-to-file"
-    "with-error-to-port"
-    "with-error-to-string"
-    "with-fluid*"
-    "with-fluids"
-    "with-fluids*"
-    "with-input-from-port"
-    "with-input-from-string"
-    "with-output-to-port"
-    "with-output-to-string"))
-
-(defun geiser-guile--keywords ()
-  (append
-   (geiser-syntax--simple-keywords geiser-guile-extra-keywords)
-   (geiser-syntax--simple-keywords geiser-guile--builtin-keywords)
-   `((,(rx "(" (group "define-once") eow (* space) (? (group (+ word))))
-      (1 font-lock-keyword-face)
-      (2 font-lock-variable-name-face nil t))
-     ("(\\(define-module\\) +(\\([^)]+\\))"
-      (1 font-lock-keyword-face)
-      (2 font-lock-type-face nil t)))))
-
-(geiser-syntax--scheme-indent
- (c-declare 0)
- (c-lambda 2)
- (call-with-input-string 1)
- (call-with-output-string 0)
- (call-with-prompt 1)
- (call-with-trace 0)
- (eval-when 1)
- (lambda* 1)
- (pmatch defun)
- (sigaction 1)
- (syntax-parameterize 1)
- (with-error-to-file 1)
- (with-error-to-port 1)
- (with-error-to-string 0)
- (with-fluid* 1)
- (with-fluids 1)
- (with-fluids* 1)
- (with-input-from-string 1)
- (with-method 1)
- (with-mutex 1)
- (with-output-to-string 0)
- (with-throw-handler 1))
-
-
-;;; Compilation shell regexps
-
-(defconst geiser-guile--path-rx "^In \\([^:\n ]+\\):\n")
-
-(defconst geiser-guile--rel-path-rx "^In +\\([^/\n :]+\\):\n")
-
-(defvar geiser-guile--file-cache (make-hash-table :test 'equal))
-
-(defun geiser-guile--resolve-file (file)
-  (when (and (stringp file)
-             (not (member file '("socket" "stdin" "unknown file"))))
-    (if (file-name-absolute-p file) file
-      (or (gethash file geiser-guile--file-cache)
-          (puthash file
-                   (geiser-eval--send/result `(:eval (:ge find-file ,file)))
-                   geiser-guile--file-cache)))))
-
-(defun geiser-guile--resolve-file-x ()
-  (let ((f (geiser-guile--resolve-file (match-string-no-properties 1))))
-    (and (stringp f) (list f))))
-
-
-;;; REPL startup
-
-(defconst geiser-guile-minimum-version "2.2")
-
-(defun geiser-guile--version (binary)
-  (car (process-lines binary "-c" "(display (version))")))
-
-(defun geiser-guile-update-warning-level ()
-  "Update the warning level used by the REPL.
-The new level is set using the value of `geiser-guile-warning-level'."
-  (interactive)
-  (let ((code `(:eval (:ge set-warnings ',geiser-guile-warning-level)
-                      (geiser evaluation))))
-    (geiser-eval--send/result code)))
-
-(defun connect-to-guile ()
-  "Start a Guile REPL connected to a remote process.
-
-Start the external Guile process with the flag --listen to make
-it spawn a server thread."
-  (interactive)
-  (geiser-connect 'guile))
-
-(defun geiser-guile--set-geiser-load-path ()
-  (let* ((path (expand-file-name "guile/" geiser-scheme-dir))
-         (witness "geiser/emacs.scm")
-         (code `(begin (if (not (%search-load-path ,witness))
-                           (set! %load-path (cons ,path %load-path)))
-                       'done)))
-    (geiser-eval--send/wait code)))
-
-(defun geiser-guile--startup (remote)
-  (set (make-local-variable 'compilation-error-regexp-alist)
-       `((,geiser-guile--path-rx geiser-guile--resolve-file-x)
-         ("^  +\\([0-9]+\\):\\([0-9]+\\)" nil 1 2)))
-  (compilation-setup t)
-  (font-lock-add-keywords nil `((,geiser-guile--path-rx
-                                 1 compilation-error-face)))
-  (let ((geiser-log-verbose-p t)
-        (g-load-path (buffer-local-value 'geiser-guile-load-path
-                                         (or geiser-repl--last-scm-buffer
-                                             (current-buffer)))))
-    (when remote (geiser-guile--set-geiser-load-path))
-    (geiser-eval--send/wait ",use (geiser emacs)\n'done")
-    (dolist (dir g-load-path)
-      (let ((dir (expand-file-name dir)))
-        (geiser-eval--send/wait `(:eval (:ge add-to-load-path ,dir)))))
-    (geiser-guile-update-warning-level)))
-
-
-;;; Manual lookup
-
-(defun geiser-guile--info-spec (&optional nodes)
-  (let* ((nrx "^[       ]+-+ [^:]+:[    ]*")
-         (drx "\\b")
-         (res (when (Info-find-file "r5rs" t)
-                `(("(r5rs)Index" nil ,nrx ,drx)))))
-    (dolist (node (or nodes geiser-guile-manual-lookup-nodes) res)
-      (when (Info-find-file node t)
-        (mapc (lambda (idx)
-                (add-to-list 'res
-                             (list (format "(%s)%s" node idx) nil nrx drx)))
-              '("Variable Index" "Procedure Index" "R5RS Index"))))))
-
-
-(info-lookup-add-help :topic 'symbol :mode 'geiser-guile-mode
-                      :ignore-case nil
-                      :regexp "[^()`',\"        \n]+"
-                      :doc-spec (geiser-guile--info-spec))
-
-(defun guile--manual-look-up (id mod)
-  (let ((info-lookup-other-window-flag
-         geiser-guile-manual-lookup-other-window-p))
-    (info-lookup-symbol (symbol-name id) 'geiser-guile-mode))
-  (when geiser-guile-manual-lookup-other-window-p
-    (switch-to-buffer-other-window "*info*"))
-  (search-forward (format "%s" id) nil t))
-
-
-;;; Implementation definition:
-
-(define-geiser-implementation guile
-  (binary geiser-guile--binary)
-  (arglist geiser-guile--parameters)
-  (version-command geiser-guile--version)
-  (minimum-version geiser-guile-minimum-version)
-  (repl-startup geiser-guile--startup)
-  (prompt-regexp geiser-guile--prompt-regexp)
-  (debugger-prompt-regexp geiser-guile--debugger-prompt-regexp)
-  (enter-debugger geiser-guile--enter-debugger)
-  (marshall-procedure geiser-guile--geiser-procedure)
-  (find-module geiser-guile--get-module)
-  (enter-command geiser-guile--enter-command)
-  (exit-command geiser-guile--exit-command)
-  (import-command geiser-guile--import-command)
-  (find-symbol-begin geiser-guile--symbol-begin)
-  (display-error geiser-guile--display-error)
-  (external-help guile--manual-look-up)
-  (check-buffer geiser-guile--guess)
-  (keywords geiser-guile--keywords)
-  (case-sensitive geiser-guile-case-sensitive-p))
-
-(geiser-impl--add-to-alist 'regexp "\\.scm$" 'guile t)
-
-
-(provide 'geiser-guile)