summaryrefslogtreecommitdiff
path: root/geiser-guile.el
blob: 339075a2adf049af2b41431487a8d966b7c3cb20 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
;;; geiser-guile.el --- Guile and Geiser talk to each other  -*- lexical-binding: t; -*-

;; Copyright (C) 2009-2022 Jose Antonio Ortega Ruiz
;; Start date: Sun Mar 08, 2009 23:03

;; Author: Jose Antonio Ortega Ruiz (jao@gnu.org)
;; Maintainer: Jose Antonio Ortega Ruiz (jao@gnu.org)
;; Keywords: languages, guile, scheme, geiser
;; Homepage: https://gitlab.com/emacs-geiser/guile
;; Package-Requires: ((emacs "25.1") (transient "0.3") (geiser "0.26.1"))
;; SPDX-License-Identifier: BSD-3-Clause
;; Version: 0.26.1

;; This file is NOT part of GNU Emacs.

;;; Commentary:

;; This package extends the `geiser' core package to support GNU
;; Guile.


;;; Code:

(require 'geiser-connection)
(require 'geiser-syntax)
(require 'geiser-custom)
(require 'geiser-repl)
(require 'geiser-impl)
(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)
                   (require 'tramp))


;;; 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)))

(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))

(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' instead."
  :type 'string)

(geiser-custom--defcustom geiser-guile-load-init-file 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)

(define-obsolete-variable-alias
  'geiser-guile-load-init-file-p 'geiser-guile-load-init-file "0.26.2")

(geiser-custom--defcustom geiser-guile-use-declarative-modules nil
  "Whether Guile should use \"declarative\" modules limiting mutability.
When set to `t', Guile will enforce immutable bindings in
exported modules."
  :type 'boolean
  :link '(info-link "(guile) Declarative Modules"))

(define-obsolete-variable-alias
  'geiser-guile-use-declarative-modules-p 'geiser-guile-use-declarative-modules
  "0.26.2")

(geiser-custom--defcustom geiser-guile-debug-backwards-backtrace t
  "Whether to configure backtraces using the \\='backwards ordering."
  :type 'boolean)

(geiser-custom--defcustom geiser-guile-debug-terminal-width 999
  "Maximum number of columns shown in backtraces.
Normally, you'd want a big value here so that messages are not
truncated.  Set to a negative value if you prefer that geiser
does not set it on startup."
  :type 'integer)

(geiser-custom--defcustom geiser-guile-debug-show-bt t
  "Whether to automatically show a full backtrace when entering the debugger.
If nil, only the last frame is shown."
  :type 'boolean)

(define-obsolete-variable-alias
  'geiser-guile-debug-show-bt-p 'geiser-guile-debug-show-bt "0.26.2")


(geiser-custom--defcustom geiser-guile-debug-show-full-bt t
  "Whether to show full backtraces in the debugger, including local variables."
  :type 'boolean)

(define-obsolete-variable-alias
  'geiser-guile-debug-show-full-bt-p 'geiser-guile-debug-show-full-bt "0.26.2")


(geiser-custom--defcustom geiser-guile-show-debug-help t
  "Whether to show brief help in the echo area when entering the debugger."
  :type 'boolean)

(define-obsolete-variable-alias
  'geiser-guile-show-debug-help-p 'geiser-guile-show-debug-help "0.26.2")

(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)))

(geiser-custom--defcustom geiser-guile-extra-keywords nil
  "Extra keywords highlighted in Guile scheme buffers."
  :type '(repeat string))

(geiser-custom--defcustom geiser-guile-case-sensitive t
  "Non-nil means keyword highlighting is case-sensitive."
  :type 'boolean)

(define-obsolete-variable-alias
  'geiser-guile-case-sensitive-p 'geiser-guile-case-sensitive "0.26.2")

(geiser-custom--defcustom geiser-guile-manual-lookup-other-window nil
  "Non-nil means pop up the Info buffer in another window."
  :type 'boolean)

(define-obsolete-variable-alias
  'geiser-guile-manual-lookup-other-window-p
  'geiser-guile-manual-lookup-other-window "0.26.2")

(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))


;;; REPL support

(defun geiser-guile--binary ()
  "Return the name of the Guile binary to execute."
  (if (listp geiser-guile-binary)
      (car geiser-guile-binary)
    geiser-guile-binary))

(defvar geiser-guile-scheme-dir
  (expand-file-name "src" (file-name-directory load-file-name))
  "Directory where the Guile scheme geiser modules are installed.")

(defvar-local geiser-guile-scheme-local-dir
    nil
  "Location for scm files to communicate using REPL that are local to process.

When using Tramp buffers, the guile modules are not local. They'll be stored in
this location for further cleanup.")

(defun geiser-guile--remote-copy (source-path target-path)
  "Copy source-path to target-path ensuring symlinks are resolved."
  ;; when using `straight', guile scripts that need to be evaluated will be
  ;; symlinks
  ;; `copy-directory' will copy broken symlinks
  ;; so we manually copy them to avoid broken symlinks in remote host
  (cond ((file-symlink-p source-path)
         (geiser-guile--remote-copy (file-truename source-path) target-path))
        ((file-directory-p source-path)
         (unless (file-directory-p target-path) (make-directory target-path t))
         (let ((dest (file-name-as-directory target-path)))
           (dolist (f (seq-difference (directory-files source-path) '("." "..")))
             (geiser-guile--remote-copy (expand-file-name f source-path)
                                        (expand-file-name f dest)))))
        (t (cl-assert (file-regular-p source-path))
           (copy-file source-path target-path))))

(defun geiser-guile-ensure-scheme-dir ()
  "Maybe setup and return dir for Guile scheme geiser modules.

If using a remote Tramp buffer, this function will copy the modules to a
temporary location in the remote server and the return it.
Else, will just return `geiser-guile-scheme-dir'."
  (cond ((not (and (fboundp 'tramp-tramp-file-p)
                   (tramp-tramp-file-p default-directory)))
         geiser-guile-scheme-dir)
        (geiser-guile-scheme-local-dir) ;; remote files are already there
        (t
         (let* ((temporary-file-directory (temporary-file-directory))
                (remote-temp-dir (make-temp-file "emacs-geiser-guile" t)))
           (message "Setting up Tramp Guile REPL...")
           (let ((inhibit-message t)) ;; prevent "Copying … to … " from dired
             (geiser-guile--remote-copy
              geiser-guile-scheme-dir
              (concat (file-name-as-directory remote-temp-dir)
                      (file-name-nondirectory
                       (directory-file-name geiser-guile-scheme-dir)))))
           ;; return the directory name as local to (remote) process
           (setq geiser-guile-scheme-local-dir
                 (concat (file-name-as-directory
                          (file-local-name remote-temp-dir))
                         (file-name-nondirectory geiser-guile-scheme-dir)))))))

(defvar geiser-guile--conn-address nil)

(defun geiser-guile--get-connection-address (&optional new)
  "The path to the UNIX socket to talk to Guile in a connection.
Unused for now."
  (when new
    (setq geiser-guile--conn-address (make-temp-name "/tmp/geiser-guile-")))
  geiser-guile--conn-address)

(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
                         (concat
                          (file-remote-p default-directory)
                          geiser-guile-init-file))))
        (c-flags (when geiser-guile--conn-address
                   `(,(format "--listen=%s"
                              (geiser-guile--get-connection-address t)))))
        (q-flags (and (not geiser-guile-load-init-file) '("-q"))))
    `(,@(and (listp geiser-guile-binary) (cdr geiser-guile-binary))
      ,@q-flags "-L" ,(geiser-guile-ensure-scheme-dir) ,@c-flags
      ,@(apply 'append (mapcar (lambda (p) (list "-L" p))
                               geiser-guile-load-path))
      ,@(and init-file (file-readable-p init-file)
             (list "-l" (file-local-name init-file))))))

(defconst geiser-guile--prompt-regexp "^[^@(\n]+@([^)]*)> ")
(defconst geiser-guile--debugger-prompt-regexp
  "^[^@(\n]+@([^)]*?) \\[\\([0-9]+\\)\\]> ")

(defconst geiser-guile--clean-rx
  (format "\\(%s\\)\\|\\(^\\$[0-9]+ = [^\n]+$\\)\\|%s"
          (geiser-con--combined-prompt geiser-guile--prompt-regexp
                                       geiser-guile--debugger-prompt-regexp)
          "\\(\nEntering a new prompt.  Type `,bt' for [^\n]+\\.$\\)"))


;;; Evaluation support
(defsubst geiser-guile--linearize-args (args)
  "Concatenate the list ARGS."
  (mapconcat 'identity args " "))

(defun geiser-guile--debug-cmd (args)
  (let ((args (if (and geiser-guile-debug-show-full-bt
                       (string= (car args) "backtrace"))
                  '("backtrace" "#:full?" "#t")
                args)))
    (concat "," (geiser-guile--linearize-args args) "\n\"\"")))

(defun geiser-guile--geiser-procedure (proc &rest args)
  "Transform PROC in string for a scheme procedure using 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")
    ((debug) (geiser-guile--debug-cmd args))
    (t (format "ge:%s (%s)" proc (geiser-guile--linearize-args args)))))

(defun geiser-guile--clean-up-output (str)
  (let ((msg (when (string-match geiser-guile--debugger-prompt-regexp str)
               (format "\n[Debugging level: %s]" (match-string 1 str)))))
    (concat (replace-regexp-in-string geiser-guile--clean-rx "" str) msg)))

(defconst geiser-guile--module-re
  "(define-module +\\(([^)]+)\\)")

(defconst geiser-guile--library-re
  "(\\(?:define-\\)?library[[:blank:]\n]+\\(([^)]+)\\)")

(defun geiser-guile--get-module (&optional module)
  "Find current buffer's module using MODULE as a hint."
  (cond ((null module)
         (save-excursion
           (geiser-syntax--pop-to-top)
           (if (or (re-search-backward geiser-guile--module-re nil t)
                   (re-search-backward geiser-guile--library-re nil t)
                   (re-search-forward geiser-guile--module-re nil t)
                   (re-search-forward geiser-guile--library-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)
  "Use FMT to format a change to MODULE, with default 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)
  "Format a REPL command to use MODULE."
  (geiser-guile--module-cmd module ",use %s"))

(defun geiser-guile--enter-command (module)
  "Format a REPL command to enter MODULE."
  (geiser-guile--module-cmd module ",m %s" "(guile-user)"))


(defun geiser-guile--exit-command ()
  "Format a REPL command to quit."
  ",q")

(defun geiser-guile--symbol-begin (module)
  "Find beginning of symbol in the context of MODULE."
  (if module
      (max (save-excursion (beginning-of-line) (point))
           (save-excursion (skip-syntax-backward "^(>") (1- (point))))
    (save-excursion (skip-syntax-backward "^'-()>") (point))))


;;; 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)
  "Internal cache.")

(defun geiser-guile--find-file (file)
  (or (gethash file geiser-guile--file-cache)
      (with-current-buffer (or geiser-debug--sender-buffer (current-buffer))
        (when-let (r geiser-repl--repl)
          (with-current-buffer r
            (geiser-eval--send/result `(:eval (:ge find-file ,file))))))))

(defun geiser-guile--resolve-file (file)
  "Find the given FILE, if it's indeed a file."
  (when (and (stringp file)
             (not (member file
                          '("socket" "stdin" "unknown file" "current input"))))
    (message "Resolving %s" file)
    (cond ((file-name-absolute-p file) file)
          (t (when-let (f (geiser-guile--find-file file))
               (puthash file f geiser-guile--file-cache))))))

(defun geiser-guile--resolve-file-x ()
  "Check if last match contain a resolvable file."
  (let ((f (geiser-guile--resolve-file (match-string-no-properties 1))))
    (and (stringp f) (list f))))


;;; Error display and debugger

(defun geiser-guile--set-up-error-links ()
  (setq-local compilation-error-regexp-alist
              `((,geiser-guile--path-rx geiser-guile--resolve-file-x)
                ("^  +\\([0-9]+\\):\\([0-9]+\\)" nil 1 2)
                ("^\\(/.*\\):\\([0-9]+\\):\\([0-9]+\\)" 1 2 3)))
  (font-lock-add-keywords nil
                          `((,geiser-guile--path-rx 1 compilation-error-face))))

(defun geiser-guile-debug--send-dbg (thing)
  (geiser-eval--send/wait (cons :debug (if (listp thing) thing (list thing)))))

(defun geiser-guile-debug--debugger-display (thing ret)
  (geiser-debug--display-retort (format ",%s" thing)
                                ret
                                (geiser-eval--retort-result-str ret nil)))

(defun geiser-guile-debug--send-to-repl (thing)
  (unless (geiser-debug-active-p) (error "Debugger not active"))
  (save-window-excursion
    (with-current-buffer geiser-debug--sender-buffer
      (when-let (ret (geiser-guile-debug--send-dbg thing))
        (geiser-guile-debug--debugger-display thing ret)))))

(defun geiser-guile-debug-quit ()
  "Quit the current debugging session level."
  (interactive)
  (geiser-guile-debug--send-to-repl 'quit))

(defun geiser-guile-debug-show-backtrace ()
  "Quit the current debugging session level."
  (interactive)
  (geiser-guile-debug--send-to-repl 'backtrace))

(defun geiser-guile-debug-show-locals ()
  "Show local variables."
  (interactive)
  (geiser-guile-debug--send-to-repl 'locals))

(defun geiser-guile-debug-show-registers ()
  "Show register values."
  (interactive)
  (geiser-guile-debug--send-to-repl 'registers))

(defun geiser-guile-debug-show-error ()
  "Show error message."
  (interactive)
  (geiser-guile-debug--send-to-repl 'error))

(transient-define-prefix geiser-guile--debug-transient ()
  "Debugging meta-commands."
  ["Guile debugger"
   [("b" "Show backtrace" geiser-guile-debug-show-backtrace)
    ("e" "Show error" geiser-guile-debug-show-error)]
   [("l" "Show locals" geiser-guile-debug-show-locals)
    ("r" "Show registers" geiser-guile-debug-show-registers)]
   [("x" "Exit debug level" geiser-guile-debug-quit)]])

(defun geiser-guile-debug-menu ()
  "Show available debugging commands, if any."
  (interactive)
  (when (and (eq 'guile geiser-impl--implementation) (geiser-debug-active-p))
    (call-interactively #'geiser-guile--debug-transient)))

(define-key geiser-debug-mode-map "," #'geiser-guile-debug-menu)

(defun geiser-guile--enter-debugger ()
  "Tell Geiser to interact with the debugger."
  (when geiser-guile-show-debug-help
    (message "Debugger active. Press , for commands."))
  nil)

(defun geiser-guile--display-error (_module _key msg)
  "Display error with given message MSG."
  (when (stringp msg)
    (geiser-guile--set-up-error-links)
    (save-excursion (insert msg)))
  (not (zerop (length 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 ()
  "Ascertain whether we are in a Guile file."
  (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 ()
  "Return Guile-specific scheme 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))


;;; REPL startup

(defconst geiser-guile-minimum-version "2.2")

(defun geiser-guile--version (_binary)
  "Find Guile's version running the configured Guile binary."
  ;; maybe one day we'll have `process-lines' with tramp support
  (let ((shell-command-switch "-c")
        (shell-file-name "sh"))
    (shell-command-to-string
     (format "%s -c %s"
             (geiser-guile--binary)
             (shell-quote-argument "(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)))

;;;###autoload
(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 ()
  "Set up scheme load path for REPL."
  (let* ((path (geiser-guile-ensure-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--set-up-declarative-modules ()
  "Set up Guile to (not) use declarative modules.
See `geiser-guile-use-declarative-modules'."
  (unless geiser-guile-use-declarative-modules
    (let ((code '(begin (eval-when (expand) (user-modules-declarative? :f)) 'ok)))
      (geiser-eval--send/wait code))))

(defun geiser-guile--set-up-backtrace ()
  "Set up Guile's backtrace properties."
  (when geiser-guile-debug-backwards-backtrace
    (geiser-eval--send/wait '(debug-enable 'backwards)))
  (when (> geiser-guile-debug-terminal-width 0)
    (geiser-eval--send/wait `(begin ((@ (system repl debug) terminal-width)
                                     ,geiser-guile-debug-terminal-width)
                                    'ok))))

(defun geiser-guile--startup (remote)
  "Startup function, for a remote connection if REMOTE is t."
  (geiser-guile--set-up-error-links)
  (let ((geiser-log-verbose t)
        (g-load-path (buffer-local-value 'geiser-guile-load-path
                                         (or geiser-repl--last-scm-buffer
                                             (current-buffer)))))
    (when (or geiser-guile--conn-address remote)
      (geiser-guile--set-geiser-load-path))
    (geiser-guile--set-up-declarative-modules)
    (geiser-guile--set-up-backtrace)
    (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 ()
  "Return info specification for given NODES."
  (let* ((nrx "^[       ]+-+ [^:]+:[    ]*")
         (drx "\\b")
         (res (when (Info-find-file "r5rs" t)
                `(("(r5rs)Index" nil ,nrx ,drx)))))
    (dolist (node 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)))
              '("R5RS Index" "Concept Index" "Procedure Index" "Variable Index"))))))

(info-lookup-add-help :topic 'symbol
                      :mode 'geiser-guile-mode
                      :ignore-case nil
                      :regexp "[^()`',\"        \n]+"
                      :doc-spec (geiser-guile--info-spec))

(defun geiser-guile--info-lookup (id)
  (cond ((null id) (info "guile"))
        ((ignore-errors (info-lookup-symbol (format "%s" id) 'geiser-guile-mode) t))
        ((and (listp id) (geiser-guile--info-lookup (car (last id)))))
        (t (geiser-guile--info-lookup (when (listp id) (butlast id))))))

(defun geiser-guile--manual-look-up (id _mod)
  "Look for ID in the Guile manuals."
  (let ((info-lookup-other-window-flag geiser-guile-manual-lookup-other-window))
    (geiser-guile--info-lookup id)
    (when geiser-guile-manual-lookup-other-window
      (switch-to-buffer-other-window "*info*"))))


;;; 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)
  (clean-up-output geiser-guile--clean-up-output)
  (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 geiser-guile--manual-look-up)
  (check-buffer geiser-guile--guess)
  (keywords geiser-guile--keywords)
  (case-sensitive geiser-guile-case-sensitive))

;;;###autoload
(geiser-activate-implementation 'guile)

;;;###autoload
(autoload 'run-guile "geiser-guile" "Start a Geiser Guile REPL." t)

;;;###autoload
(autoload 'switch-to-guile "geiser-guile"
  "Start a Geiser Guile REPL, or switch to a running one." t)

(provide 'geiser-guile)
;;; geiser-guile.el ends here