Newer
Older
(defpackage :asdf/pathname
(:use :common-lisp :asdf/utility)
#+gcl<2.7 (:shadowing-import-from :system :*load-pathname*) ;; GCL 2.6 sucks
(:export
#:*resolve-symlinks*
;; Making and merging pathnames, portably
#:normalize-pathname-directory-component #:denormalize-pathname-directory-component
#:merge-pathname-directory-components #:make-pathname*
#:make-pathname-component-logical #:make-pathname-logical
#:merge-pathnames*
;; Directories
#:pathname-directory-pathname #:pathname-parent-directory-pathname
#:directory-pathname-p #:ensure-directory-pathname
;; Absolute vs relative pathnames
#:absolute-pathname-p #:ensure-pathname-absolute
#:relativize-directory-component #:relativize-pathname-directory
;; Parsing filenames and lists thereof
#:component-name-to-pathname-components
#:split-name-type #:coerce-pathname #:subpathname #:subpathname* #:ensure-pathname*
#:hidden-file-p
;; Resolving symlinks somewhat
#:truenamize #:resolve-symlinks #:resolve-symlinks*
;; Wildcard pathnames
#:*wild* #:*wild-file* #:*wild-directory* #:*wild-inferiors* #:*wild-path* #:wilden
;; Pathname host and its root
#:pathname-root #:directory-separator-for-host
#:directorize-pathname-host-device
;; defaults
#:nil-pathname #:with-pathname-defaults
;; probe filesystem
#:truename* #:probe-file* #:safe-file-write-date
#:subdirectories #:directory-files #:directory*
#:filter-logical-directory-results #:collect-sub*directories
;; Simple filesystem operations
#:ensure-all-directories-exist
#:rename-file-overwriting-target
#:delete-file-if-exists
;; Translate a pathname
#:translate-pathname*
;; temporary
#:add-pathname-suffix #:tmpize-pathname
#:call-with-staging-pathname #:with-staging-pathname
;; basic pathnames
#:load-pathname #:default-directory #:nil-pathname
;; physical pathnames
#:physical-pathname-p #:sane-physical-pathname
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
;; Windows shortcut support
#:read-null-terminated-string #:read-little-endian
#:parse-file-location-info #:parse-windows-shortcut))
(in-package :asdf/pathname)
;;; User-visible parameters
(defvar *resolve-symlinks* t
"Determine whether or not ASDF resolves symlinks when defining systems.
Defaults to T.")
;;; The hell of portably making and merging pathnames!
(defun* normalize-pathname-directory-component (directory)
"Given a pathname directory component, return an equivalent form that is a list"
#+gcl<2.7 (setf directory (substitute :back :parent directory))
(cond
#-(or cmu sbcl scl) ;; these implementations already normalize directory components.
((stringp directory) `(:absolute ,directory))
#+gcl<2.7
((and (consp directory) (eq :root (first directory)))
`(:absolute ,@(rest directory)))
((or (null directory)
(and (consp directory) (member (first directory) '(:absolute :relative))))
directory)
#+gcl<2.7
((consp directory)
`(:relative ,@directory))
(t
(error (compatfmt "~@<Unrecognized pathname directory component ~S~@:>") directory))))
(defun* denormalize-pathname-directory-component (directory-component)
#-gcl<2.7 directory-component
#+gcl<2.7
(let ((d (substitute-if :parent (lambda (x) (member x '(:up :back)))
directory-component)))
(cond
((and (consp d) (eq :relative (first d))) (rest d))
((and (consp d) (eq :absolute (first d))) `(:root ,@(rest d)))
(t d))))
(defun* merge-pathname-directory-components (specified defaults)
;; Helper for merge-pathnames* that handles directory components.
(let ((directory (normalize-pathname-directory-component specified)))
(ecase (first directory)
((nil) defaults)
(:absolute specified)
(:relative
(let ((defdir (normalize-pathname-directory-component defaults))
(reldir (cdr directory)))
(cond
((null defdir)
directory)
((not (eq :back (first reldir)))
(append defdir reldir))
(t
(loop :with defabs = (first defdir)
:with defrev = (reverse (rest defdir))
:while (and (eq :back (car reldir))
(or (and (eq :absolute defabs) (null defrev))
(stringp (car defrev))))
:do (pop reldir) (pop defrev)
:finally (return (cons defabs (append (reverse defrev) reldir)))))))))))
(defun* make-pathname* (&rest keys &key (directory nil directoryp)
host device name type version defaults #+scl &allow-other-keys)
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
(declare (ignore host device name type version defaults))
(apply 'make-pathname
(append (when directoryp
`(:directory ,(denormalize-pathname-directory-component directory)))
keys)))
(defun* make-pathname-component-logical (x)
"Make a pathname component suitable for use in a logical-pathname"
(typecase x
((eql :unspecific) nil)
#+clisp (string (string-upcase x))
#+clisp (cons (mapcar 'make-pathname-component-logical x))
(t x)))
(defun* make-pathname-logical (pathname host)
"Take a PATHNAME's directory, name, type and version components,
and make a new pathname with corresponding components and specified logical HOST"
(make-pathname*
:host host
:directory (make-pathname-component-logical (pathname-directory pathname))
:name (make-pathname-component-logical (pathname-name pathname))
:type (make-pathname-component-logical (pathname-type pathname))
:version (make-pathname-component-logical (pathname-version pathname))))
(defun* merge-pathnames* (specified &optional (defaults *default-pathname-defaults*))
"MERGE-PATHNAMES* is like MERGE-PATHNAMES except that
if the SPECIFIED pathname does not have an absolute directory,
then the HOST and DEVICE both come from the DEFAULTS, whereas
if the SPECIFIED pathname does have an absolute directory,
then the HOST and DEVICE both come from the SPECIFIED.
Also, if either argument is NIL, then the other argument is returned unmodified."
(when (null specified) (return-from merge-pathnames* defaults))
(when (null defaults) (return-from merge-pathnames* specified))
#+scl
(ext:resolve-pathname specified defaults)
#-scl
(let* ((specified (pathname specified))
(defaults (pathname defaults))
(directory (normalize-pathname-directory-component (pathname-directory specified)))
(name (or (pathname-name specified) (pathname-name defaults)))
(type (or (pathname-type specified) (pathname-type defaults)))
(version (or (pathname-version specified) (pathname-version defaults))))
(labels ((unspecific-handler (p)
(if (typep p 'logical-pathname) #'make-pathname-component-logical #'identity)))
(multiple-value-bind (host device directory unspecific-handler)
(ecase (first directory)
((:absolute)
(values (pathname-host specified)
(pathname-device specified)
directory
(unspecific-handler specified)))
((nil :relative)
(values (pathname-host defaults)
(pathname-device defaults)
(merge-pathname-directory-components directory (pathname-directory defaults))
(unspecific-handler defaults))))
(make-pathname* :host host :device device :directory directory
:name (funcall unspecific-handler name)
:type (funcall unspecific-handler type)
:version (funcall unspecific-handler version))))))
;;; Directories
(defun* pathname-directory-pathname (pathname)
"Returns a new pathname with same HOST, DEVICE, DIRECTORY as PATHNAME,
and NIL NAME, TYPE and VERSION components"
(when pathname
(make-pathname :name nil :type nil :version nil :defaults pathname)))
(defun* pathname-parent-directory-pathname (pathname)
"Returns a new pathname with same HOST, DEVICE, DIRECTORY as PATHNAME,
and NIL NAME, TYPE and VERSION components"
(when pathname
(make-pathname* :name nil :type nil :version nil
:directory (merge-pathname-directory-components
'(:relative :back) (pathname-directory pathname))
:defaults pathname)))
(defun* directory-pathname-p (pathname)
"Does PATHNAME represent a directory?
A directory-pathname is a pathname _without_ a filename. The three
ways that the filename components can be missing are for it to be NIL,
:UNSPECIFIC or the empty string.
Note that this does _not_ check to see that PATHNAME points to an
actually-existing directory."
(when pathname
(let ((pathname (pathname pathname)))
(flet ((check-one (x)
(member x '(nil :unspecific "") :test 'equal)))
(and (not (wild-pathname-p pathname))
(check-one (pathname-name pathname))
(check-one (pathname-type pathname))
t)))))
(defun* ensure-directory-pathname (pathspec)
"Converts the non-wild pathname designator PATHSPEC to directory form."
(cond
((stringp pathspec)
(ensure-directory-pathname (pathname pathspec)))
((not (pathnamep pathspec))
(error (compatfmt "~@<Invalid pathname designator ~S~@:>") pathspec))
((wild-pathname-p pathspec)
(error (compatfmt "~@<Can't reliably convert wild pathname ~3i~_~S~@:>") pathspec))
((directory-pathname-p pathspec)
pathspec)
(t
(make-pathname* :directory (append (or (normalize-pathname-directory-component
(pathname-directory pathspec))
(list :relative))
(list (file-namestring pathspec)))
:name nil :type nil :version nil :defaults pathspec))))
;;; Wildcard pathnames
(defparameter *wild* (or #+cormanlisp "*" :wild))
(defparameter *wild-file*
(make-pathname :directory nil :name *wild* :type *wild*
:version (or #-(or abcl xcl) *wild*)))
(defparameter *wild-directory*
(make-pathname* :directory `(:relative ,(or #+gcl<2.7 "*" *wild*))
:name nil :type nil :version nil))
(defparameter *wild-inferiors*
(make-pathname* :directory `(:relative ,(or #+gcl<2.7 "**" :wild-inferiors))
:name nil :type nil :version nil))
(defparameter *wild-path*
(merge-pathnames *wild-file* *wild-inferiors*))
(defun* wilden (path)
(merge-pathnames* *wild-path* path))
;;; Probing the filesystem
(defun* nil-pathname (&optional (defaults *default-pathname-defaults*))
(make-pathname :directory nil :name nil :type nil :version nil :device nil :host nil
:defaults defaults)) ;; shouldn't matter
(defmacro with-pathname-defaults ((&optional defaults) &body body)
`(let ((*default-pathname-defaults* ,(or defaults (nil-pathname)))) ,@body))
(defun truename* (p)
;; avoids both logical-pathname merging and physical resolution issues
(ignore-errors (with-pathname-defaults () (truename p))))
(defun* probe-file* (p)
"when given a pathname P, probes the filesystem for a file or directory
with given pathname and if it exists return its truename."
(with-pathname-defaults () ;; avoids logical-pathname issues on some implementations
(etypecase p
(null nil)
(string (probe-file* (parse-namestring p)))
(pathname (unless (wild-pathname-p p)
#.(or #+(or allegro clozure cmu cormanlisp ecl lispworks mkcl sbcl scl)
'(probe-file p)
#+clisp (aif (find-symbol* '#:probe-pathname :ext)
`(ignore-errors (,it p)))
#+gcl<2.7
'(or (probe-file p)
(and (directory-pathname-p p)
(ignore-errors
(ensure-directory-pathname
(truename* (subpathname (ensure-directory-pathname p) "."))))))
'(truename* p)))))))
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
(defun* safe-file-write-date (pathname)
;; If FILE-WRITE-DATE returns NIL, it's possible that
;; the user or some other agent has deleted an input file.
;; Also, generated files will not exist at the time planning is done
;; and calls compute-action-stamp which calls safe-file-write-date.
;; So it is very possible that we can't get a valid file-write-date,
;; and we can survive and we will continue the planning
;; as if the file were very old.
;; (or should we treat the case in a different, special way?)
(and pathname (probe-file* pathname) (ignore-errors (file-write-date pathname))))
(defun* directory* (pathname-spec &rest keys &key &allow-other-keys)
(apply 'directory pathname-spec
(append keys '#.(or #+allegro '(:directories-are-files nil :follow-symbolic-links nil)
#+clozure '(:follow-links nil)
#+clisp '(:circle t :if-does-not-exist :ignore)
#+(or cmu scl) '(:follow-links nil :truenamep nil)
#+sbcl (when (find-symbol* :resolve-symlinks '#:sb-impl)
'(:resolve-symlinks nil))))))
(defun* filter-logical-directory-results (directory entries merger)
(if (typep directory 'logical-pathname)
;; Try hard to not resolve logical-pathname into physical pathnames;
;; otherwise logical-pathname users/lovers will be disappointed.
;; If directory* could use some implementation-dependent magic,
;; we will have logical pathnames already; otherwise,
;; we only keep pathnames for which specifying the name and
;; translating the LPN commute.
(loop :for f :in entries
:for p = (or (and (typep f 'logical-pathname) f)
(let* ((u (ignore-errors (funcall merger f))))
;; The first u avoids a cumbersome (truename u) error.
;; At this point f should already be a truename,
;; but isn't quite in CLISP, for it doesn't have :version :newest
(and u (equal (truename* u) (truename* f)) u)))
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
:when p :collect p)
entries))
(defun* directory-files (directory &optional (pattern *wild-file*))
(let ((dir (pathname directory)))
(when (typep dir 'logical-pathname)
;; Because of the filtering we do below,
;; logical pathnames have restrictions on wild patterns.
;; Not that the results are very portable when you use these patterns on physical pathnames.
(when (wild-pathname-p dir)
(error "Invalid wild pattern in logical directory ~S" directory))
(unless (member (pathname-directory pattern) '(() (:relative)) :test 'equal)
(error "Invalid file pattern ~S for logical directory ~S" pattern directory))
(setf pattern (make-pathname-logical pattern (pathname-host dir))))
(let ((entries (ignore-errors (directory* (merge-pathnames* pattern dir)))))
(filter-logical-directory-results
directory entries
#'(lambda (f)
(make-pathname :defaults dir
:name (make-pathname-component-logical (pathname-name f))
:type (make-pathname-component-logical (pathname-type f))
:version (make-pathname-component-logical (pathname-version f))))))))
(defun* subdirectories (directory)
(let* ((directory (ensure-directory-pathname directory))
#-(or abcl cormanlisp genera xcl)
(wild (merge-pathnames*
#-(or abcl allegro cmu lispworks sbcl scl xcl)
*wild-directory*
#+(or abcl allegro cmu lispworks sbcl scl xcl) "*.*"
directory))
(dirs
#-(or abcl cormanlisp genera xcl)
(ignore-errors
(directory* wild . #.(or #+clozure '(:directories t :files nil)
#+mcl '(:directories t))))
#+(or abcl xcl) (system:list-directory directory)
#+cormanlisp (cl::directory-subdirs directory)
#+genera (fs:directory-list directory))
#+(or abcl allegro cmu genera lispworks sbcl scl xcl)
(dirs (loop :for x :in dirs
:for d = #+(or abcl xcl) (extensions:probe-directory x)
#+allegro (excl:probe-directory x)
#+(or cmu sbcl scl) (directory-pathname-p x)
#+genera (getf (cdr x) :directory)
#+lispworks (lw:file-directory-p x)
:when d :collect #+(or abcl allegro xcl) d
#+genera (ensure-directory-pathname (first x))
#+(or cmu lispworks sbcl scl) x)))
(filter-logical-directory-results
directory dirs
(let ((prefix (or (normalize-pathname-directory-component (pathname-directory directory))
'(:absolute)))) ; because allegro returns NIL for #p"FOO:"
#'(lambda (d)
(let ((dir (normalize-pathname-directory-component (pathname-directory d))))
(and (consp dir) (consp (cdr dir))
(make-pathname
:defaults directory :name nil :type nil :version nil
:directory (append prefix (make-pathname-component-logical (last dir)))))))))))
(defun* collect-sub*directories (directory collectp recursep collector)
(when (funcall collectp directory)
(funcall collector directory))
(dolist (subdir (subdirectories directory))
(when (funcall recursep subdir)
(collect-sub*directories subdir collectp recursep collector))))
;;; Parsing filenames and lists thereof
(defun* component-name-to-pathname-components (s &key force-directory force-relative)
"Splits the path string S, returning three values:
A flag that is either :absolute or :relative, indicating
how the rest of the values are to be interpreted.
A directory path --- a list of strings, suitable for
use with MAKE-PATHNAME when prepended with the flag
value.
A filename with type extension, possibly NIL in the
case of a directory pathname.
FORCE-DIRECTORY forces S to be interpreted as a directory
pathname \(third return value will be NIL, final component
of S will be treated as part of the directory path.
The intention of this function is to support structured component names,
e.g., \(:file \"foo/bar\"\), which will be unpacked to relative
pathnames."
(check-type s string)
(when (find #\: s)
(error (compatfmt "~@<A portable ASDF pathname designator cannot include a #\: character: ~3i~_~S~@:>") s))
(let* ((components (split-string s :separator "/"))
(last-comp (car (last components))))
(multiple-value-bind (relative components)
(if (equal (first components) "")
(if (equal (first-char s) #\/)
(progn
(when force-relative
(error (compatfmt "~@<Absolute pathname designator not allowed: ~3i~_~S~@:>") s))
(values :absolute (cdr components)))
(values :relative nil))
(values :relative components))
(setf components (remove-if #'(lambda (x) (member x '("" ".") :test #'equal)) components))
(setf components (substitute :back ".." components :test #'equal))
(cond
((equal last-comp "")
(values relative components nil)) ; "" already removed
(force-directory
(values relative components nil))
(t
(values relative (butlast components) last-comp))))))
(defun* split-name-type (filename)
(let ((unspecific
;; Giving :unspecific as argument to make-pathname is not portable.
;; See CLHS make-pathname and 19.2.2.2.3.
;; We only use it on implementations that support it,
#+(or abcl allegro clozure cmu gcl genera lispworks mkcl sbcl scl xcl) :unspecific
#+(or clisp ecl #|These haven't been tested:|# cormanlisp mcl) nil))
(destructuring-bind (name &optional (type unspecific))
(split-string filename :max 2 :separator ".")
(if (equal name "")
(values filename unspecific)
(values name type)))))
(defun* coerce-pathname (name &key type defaults)
"coerce NAME into a PATHNAME.
When given a string, portably decompose it into a relative pathname:
#\\/ separates subdirectories. The last #\\/-separated string is as follows:
if TYPE is NIL, its last #\\. if any separates name and type from from type;
if TYPE is a string, it is the type, and the whole string is the name;
if TYPE is :DIRECTORY, the string is a directory component;
if the string is empty, it's a directory.
Any directory named .. is read as :BACK.
Host, device and version components are taken from DEFAULTS."
;; The defaults are required notably because they provide the default host
;; to the below make-pathname, which may crucially matter to people using
;; merge-pathnames with non-default hosts, e.g. for logical-pathnames.
;; NOTE that the host and device slots will be taken from the defaults,
;; but that should only matter if you later merge relative pathnames with
;; CL:MERGE-PATHNAMES instead of ASDF:MERGE-PATHNAMES*
(etypecase name
((or null pathname)
name)
(symbol
(coerce-pathname (string-downcase name) :type type :defaults defaults))
(string
(multiple-value-bind (relative path filename)
(component-name-to-pathname-components name :force-directory (eq type :directory)
:force-relative t)
(multiple-value-bind (name type)
(cond
((or (eq type :directory) (null filename))
(values nil nil))
(type
(values filename type))
(t
(split-name-type filename)))
(apply 'make-pathname* :directory (cons relative path) :name name :type type
(when defaults `(:defaults ,defaults))))))))
(defun* subpathname (pathname subpath &key type)
(and pathname (merge-pathnames* (coerce-pathname subpath :type type)
(pathname-directory-pathname pathname))))
(defun* subpathname* (pathname subpath &key type)
(and pathname
(subpathname (ensure-directory-pathname pathname) subpath :type type)))
(defun* absolute-pathname-p (pathspec)
(and (typep pathspec '(or pathname string))
(eq :absolute (car (normalize-pathname-directory-component
(pathname-directory (pathname pathspec)))))))
(defun* ensure-pathname* (x want-absolute want-directory fmt &rest args)
(when (plusp (length x))
(let ((p (if want-directory (ensure-directory-pathname x) (pathname x))))
(when want-absolute
(unless (absolute-pathname-p p)
(cerror "ignore relative pathname"
"Invalid relative pathname ~A~@[ ~?~]" x fmt args)
(return-from ensure-pathname* nil)))
p)))
(defun* hidden-file-p (pathname)
(equal (first-char (pathname-name pathname)) #\.))
;;; Pathname host and its root
(defun* pathname-root (pathname)
(make-pathname* :directory '(:absolute)
:name nil :type nil :version nil
:defaults pathname ;; host device, and on scl, *some*
;; scheme-specific parts: port username password, not others:
. #.(or #+scl '(:parameters nil :query nil :fragment nil))))
(defun* pathname-host-pathname (pathname)
(make-pathname :directory nil
:name nil :type nil :version nil :device nil
:defaults pathname ;; host device, and on scl, *some*
;; scheme-specific parts: port username password, not others:
. #.(or #+scl '(:parameters nil :query nil :fragment nil))))
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
#-scl
(defun* directory-separator-for-host (&optional (pathname *default-pathname-defaults*))
(let ((foo (make-pathname* :directory '(:absolute "FOO") :defaults pathname)))
(last-char (namestring foo))))
#-scl
(defun* directorize-pathname-host-device (pathname)
(let* ((root (pathname-root pathname))
(wild-root (wilden root))
(absolute-pathname (merge-pathnames* pathname root))
(separator (directory-separator-for-host root))
(root-namestring (namestring root))
(root-string
(substitute-if #\/
#'(lambda (x) (or (eql x #\:)
(eql x separator)))
root-namestring)))
(multiple-value-bind (relative path filename)
(component-name-to-pathname-components root-string :force-directory t)
(declare (ignore relative filename))
(let ((new-base
(make-pathname* :defaults root :directory `(:absolute ,@path))))
(translate-pathname absolute-pathname wild-root (wilden new-base))))))
#+scl
(defun* directorize-pathname-host-device (pathname)
(let ((scheme (ext:pathname-scheme pathname))
(host (pathname-host pathname))
(port (ext:pathname-port pathname))
(directory (pathname-directory pathname)))
(flet ((specificp (x) (and x (not (eq x :unspecific)))))
(if (or (specificp port)
(and (specificp host) (plusp (length host)))
(specificp scheme))
(let ((prefix ""))
(when (specificp port)
(setf prefix (format nil ":~D" port)))
(when (and (specificp host) (plusp (length host)))
(setf prefix (strcat host prefix)))
(setf prefix (strcat ":" prefix))
(when (specificp scheme)
(setf prefix (strcat scheme prefix)))
(assert (and directory (eq (first directory) :absolute)))
(make-pathname* :directory `(:absolute ,prefix ,@(rest directory))
:defaults pathname)))
pathname)))
;;; Resolving symlinks somewhat
(defun* truenamize (pathname &optional (defaults *default-pathname-defaults*))
"Resolve as much of a pathname as possible"
(block nil
(when (typep pathname '(or null logical-pathname)) (return pathname))
(let ((p (merge-pathnames* pathname defaults)))
(when (typep p 'logical-pathname) (return p))
(let ((found (probe-file* p)))
(when found (return found)))
(unless (absolute-pathname-p p)
(let ((true-defaults (truename* defaults)))
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
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
(when true-defaults
(setf p (merge-pathnames pathname true-defaults)))))
(unless (absolute-pathname-p p) (return p))
(let ((sofar (probe-file* (pathname-root p))))
(unless sofar (return p))
(flet ((solution (directories)
(merge-pathnames*
(make-pathname* :host nil :device nil
:directory `(:relative ,@directories)
:name (pathname-name p)
:type (pathname-type p)
:version (pathname-version p))
sofar)))
(loop :with directory = (normalize-pathname-directory-component
(pathname-directory p))
:for component :in (cdr directory)
:for rest :on (cdr directory)
:for more = (probe-file*
(merge-pathnames*
(make-pathname* :directory `(:relative ,component))
sofar)) :do
(if more
(setf sofar more)
(return (solution rest)))
:finally
(return (solution nil))))))))
(defun* resolve-symlinks (path)
#-allegro (truenamize path)
#+allegro (if (typep path 'logical-pathname)
path
(excl:pathname-resolve-symbolic-links path)))
(defun* resolve-symlinks* (path)
(if *resolve-symlinks*
(and path (resolve-symlinks path))
path))
;;; absolute vs relative
(defun* ensure-pathname-absolute (path)
(cond
((absolute-pathname-p path) path)
((stringp path) (ensure-pathname-absolute (pathname path)))
((not (pathnamep path)) (error "not a valid pathname designator ~S" path))
(t (let ((resolved (resolve-symlinks path)))
(assert (absolute-pathname-p resolved))
resolved))))
(defun* relativize-directory-component (directory-component)
(let ((directory (normalize-pathname-directory-component directory-component)))
(cond
((stringp directory)
(list :relative directory))
((eq (car directory) :absolute)
(cons :relative (cdr directory)))
(t
directory))))
(defun* relativize-pathname-directory (pathspec)
(let ((p (pathname pathspec)))
(make-pathname*
:directory (relativize-directory-component (pathname-directory p))
:defaults p)))
;;; Simple filesystem operations
(defun* ensure-all-directories-exist (pathnames)
(dolist (pathname pathnames)
(ensure-directories-exist (translate-logical-pathname pathname))))
(defun* rename-file-overwriting-target (source target)
#+clisp ;; But for a bug in CLISP 2.48, we should use :if-exists :overwrite and be atomic
(posix:copy-file source target :method :rename)
#-clisp
(rename-file source target
#+clozure :if-exists #+clozure :rename-and-delete))
(defun* delete-file-if-exists (x)
(when (and x (probe-file* x))
(delete-file x)))
;;; Translate a pathname
(defun* translate-pathname* (path absolute-source destination &optional root source)
(declare (ignore source))
(cond
((functionp destination)
(funcall destination path absolute-source))
((eq destination t)
path)
((not (pathnamep destination))
(error "Invalid destination"))
((not (absolute-pathname-p destination))
(translate-pathname path absolute-source (merge-pathnames* destination root)))
(root
(translate-pathname (directorize-pathname-host-device path) absolute-source destination))
(t
(translate-pathname path absolute-source destination))))
;;; Temporary pathnames
(defun* add-pathname-suffix (pathname suffix)
(make-pathname :name (strcat (pathname-name pathname) suffix)
:defaults pathname))
(defun* tmpize-pathname (x)
(add-pathname-suffix x "-ASDF-TMP"))
(defun* call-with-staging-pathname (pathname fun)
"Calls fun with a staging pathname, and atomically
renames the staging pathname to the pathname in the end.
Note: this protects only against failure of the program,
not against concurrent attempts.
For the latter case, we ought pick random suffix and atomically open it."
(let* ((pathname (pathname pathname))
(staging (tmpize-pathname pathname)))
(unwind-protect
(multiple-value-prog1
(funcall fun staging)
(rename-file-overwriting-target staging pathname))
(when (probe-file* staging)
(delete-file staging)))))
(defmacro with-staging-pathname ((pathname-var &optional (pathname-value pathname-var)) &body body)
`(call-with-staging-pathname ,pathname-value #'(lambda (,pathname-var) ,@body)))
;;; Basic pathnames
(defun* load-pathname ()
(resolve-symlinks* (or *load-pathname* *compile-file-pathname*)))
(defun* default-directory ()
(truenamize (pathname-directory-pathname *default-pathname-defaults*)))
(defun* physical-pathname-p (x)
(and (pathnamep x) (not (typep x 'logical-pathname))))
(defun* sane-physical-pathname (&key (defaults *default-pathname-defaults*)
fallback (keep t) must-exist)
(flet ((sanitize (x)
(setf x (and x (ignore-errors (translate-logical-pathname x))))
(when (pathnamep x)
(setf x
(ecase keep
((t) x)
((:directory) (pathname-directory-pathname x))
((:root) (pathname-root x))
((:host) (pathname-host-pathname x))
((nil) (nil-pathname x))))
(when must-exist ;; CCL's probe-file will choke if d-p-d is logical
(setf x (and (probe-file* x) x)))
(and (physical-pathname-p x) x))))
(or (sanitize defaults)
(when fallback (sanitize (ignore-errors (user-homedir-pathname))))
(error "Could not find a sanitize ~S ~:[~;or a fallback ~] into a physical pathname"
defaults fallback))))
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
;;;; -----------------------------------------------------------------
;;;; Windows shortcut support. Based on:
;;;;
;;;; Jesse Hager: The Windows Shortcut File Format.
;;;; http://www.wotsit.org/list.asp?fc=13
#-(or clisp genera) ; CLISP doesn't need it, and READ-SEQUENCE annoys old Genera.
(progn
(defparameter *link-initial-dword* 76)
(defparameter *link-guid* #(1 20 2 0 0 0 0 0 192 0 0 0 0 0 0 70))
(defun* read-null-terminated-string (s)
(with-output-to-string (out)
(loop :for code = (read-byte s)
:until (zerop code)
:do (write-char (code-char code) out))))
(defun* read-little-endian (s &optional (bytes 4))
(loop :for i :from 0 :below bytes
:sum (ash (read-byte s) (* 8 i))))
(defun* parse-file-location-info (s)
(let ((start (file-position s))
(total-length (read-little-endian s))
(end-of-header (read-little-endian s))
(fli-flags (read-little-endian s))
(local-volume-offset (read-little-endian s))
(local-offset (read-little-endian s))
(network-volume-offset (read-little-endian s))
(remaining-offset (read-little-endian s)))
(declare (ignore total-length end-of-header local-volume-offset))
(unless (zerop fli-flags)
(cond
((logbitp 0 fli-flags)
(file-position s (+ start local-offset)))
((logbitp 1 fli-flags)
(file-position s (+ start
network-volume-offset
#x14))))
(strcat (read-null-terminated-string s)
(progn
(file-position s (+ start remaining-offset))
(read-null-terminated-string s))))))
(defun* parse-windows-shortcut (pathname)
(with-open-file (s pathname :element-type '(unsigned-byte 8))
(handler-case
(when (and (= (read-little-endian s) *link-initial-dword*)
(let ((header (make-array (length *link-guid*))))
(read-sequence header s)
(equalp header *link-guid*)))
(let ((flags (read-little-endian s)))
(file-position s 76) ;skip rest of header
(when (logbitp 0 flags)
;; skip shell item id list
(let ((length (read-little-endian s 2)))
(file-position s (+ length (file-position s)))))
(cond
((logbitp 1 flags)
(parse-file-location-info s))
(t
(when (logbitp 2 flags)
;; skip description string
(let ((length (read-little-endian s 2)))
(file-position s (+ length (file-position s)))))
(when (logbitp 3 flags)
;; finally, our pathname
(let* ((length (read-little-endian s 2))
(buffer (make-array length)))
(read-sequence buffer s)
(map 'string #'code-char buffer)))))))
(end-of-file (c)
(declare (ignore c))
nil)))))