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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)