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233e7676 | 1 | ;;; GNU Guix --- Functional package management for GNU |
2cd5c038 | 2 | ;;; Copyright © 2012, 2013, 2014 Ludovic Courtès <ludo@gnu.org> |
56b943de | 3 | ;;; Copyright © 2013 Mark H Weaver <mhw@netris.org> |
e3deeebb | 4 | ;;; |
233e7676 | 5 | ;;; This file is part of GNU Guix. |
e3deeebb | 6 | ;;; |
233e7676 | 7 | ;;; GNU Guix is free software; you can redistribute it and/or modify it |
e3deeebb LC |
8 | ;;; under the terms of the GNU General Public License as published by |
9 | ;;; the Free Software Foundation; either version 3 of the License, or (at | |
10 | ;;; your option) any later version. | |
11 | ;;; | |
233e7676 | 12 | ;;; GNU Guix is distributed in the hope that it will be useful, but |
e3deeebb LC |
13 | ;;; WITHOUT ANY WARRANTY; without even the implied warranty of |
14 | ;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | ;;; GNU General Public License for more details. | |
16 | ;;; | |
17 | ;;; You should have received a copy of the GNU General Public License | |
233e7676 | 18 | ;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>. |
e3deeebb LC |
19 | |
20 | (define-module (guix utils) | |
00e219d1 | 21 | #:use-module (guix config) |
38b3122a | 22 | #:use-module (srfi srfi-1) |
72d86963 | 23 | #:use-module (srfi srfi-9) |
01ac19dc | 24 | #:use-module (srfi srfi-11) |
38b3122a | 25 | #:use-module (srfi srfi-26) |
de4c3f26 | 26 | #:use-module (srfi srfi-39) |
e3deeebb LC |
27 | #:use-module (srfi srfi-60) |
28 | #:use-module (rnrs bytevectors) | |
dba6b34b | 29 | #:use-module ((rnrs io ports) #:select (put-bytevector)) |
e0fbbc88 | 30 | #:use-module ((guix build utils) #:select (dump-port)) |
29fa45f4 | 31 | #:use-module ((guix build syscalls) #:select (errno)) |
c8369cac | 32 | #:use-module (ice-9 vlist) |
38b3122a | 33 | #:use-module (ice-9 format) |
de4c3f26 LC |
34 | #:autoload (ice-9 popen) (open-pipe*) |
35 | #:autoload (ice-9 rdelim) (read-line) | |
98090557 | 36 | #:use-module (ice-9 regex) |
72d86963 | 37 | #:use-module (ice-9 match) |
8ef3401f | 38 | #:use-module (ice-9 format) |
2cd5c038 | 39 | #:use-module (system foreign) |
ddc29a78 | 40 | #:export (bytevector->base16-string |
6d800a80 | 41 | base16-string->bytevector |
de4c3f26 LC |
42 | |
43 | %nixpkgs-directory | |
44 | nixpkgs-derivation | |
ce5d658c | 45 | nixpkgs-derivation* |
de4c3f26 | 46 | |
900f7267 | 47 | compile-time-value |
2cd5c038 | 48 | fcntl-flock |
98090557 | 49 | memoize |
0af2c24e LC |
50 | default-keyword-arguments |
51 | substitute-keyword-arguments | |
ff352cfb | 52 | |
64fc89b6 | 53 | <location> |
ff352cfb LC |
54 | location |
55 | location? | |
56 | location-file | |
57 | location-line | |
58 | location-column | |
59 | source-properties->location | |
60 | ||
98090557 | 61 | gnu-triplet->nix-system |
9b48fb88 | 62 | %current-system |
9c1edabd | 63 | %current-target-system |
0d1e6ce4 MW |
64 | version-compare |
65 | version>? | |
7db3ff4a | 66 | guile-version>? |
04fd96ca | 67 | package-name->name+version |
2bcfb9e0 | 68 | string-tokenize* |
56b943de | 69 | string-replace-substring |
0fdd3bea | 70 | file-extension |
ac10e0e1 | 71 | file-sans-extension |
861693f3 | 72 | call-with-temporary-output-file |
04d4c8a4 | 73 | with-atomic-file-output |
e0fbbc88 | 74 | fold2 |
7a8024a3 LC |
75 | |
76 | filtered-port | |
77 | compressed-port | |
80dea563 | 78 | decompressed-port |
01ac19dc LC |
79 | call-with-decompressed-port |
80 | compressed-output-port | |
81 | call-with-compressed-output-port)) | |
e3deeebb | 82 | |
38b3122a | 83 | \f |
dba6b34b LC |
84 | ;;; |
85 | ;;; Compile-time computations. | |
86 | ;;; | |
87 | ||
88 | (define-syntax compile-time-value | |
89 | (syntax-rules () | |
90 | "Evaluate the given expression at compile time. The expression must | |
91 | evaluate to a simple datum." | |
92 | ((_ exp) | |
93 | (let-syntax ((v (lambda (s) | |
94 | (let ((val exp)) | |
95 | (syntax-case s () | |
96 | (_ #`'#,(datum->syntax s val))))))) | |
97 | v)))) | |
98 | ||
99 | \f | |
38b3122a LC |
100 | ;;; |
101 | ;;; Base 16. | |
102 | ;;; | |
103 | ||
104 | (define (bytevector->base16-string bv) | |
105 | "Return the hexadecimal representation of BV's contents." | |
106 | (define len | |
107 | (bytevector-length bv)) | |
108 | ||
109 | (let-syntax ((base16-chars (lambda (s) | |
110 | (syntax-case s () | |
111 | (_ | |
112 | (let ((v (list->vector | |
113 | (unfold (cut > <> 255) | |
114 | (lambda (n) | |
115 | (format #f "~2,'0x" n)) | |
116 | 1+ | |
117 | 0)))) | |
118 | v)))))) | |
119 | (define chars base16-chars) | |
120 | (let loop ((i 0) | |
121 | (r '())) | |
122 | (if (= i len) | |
123 | (string-concatenate-reverse r) | |
124 | (loop (+ 1 i) | |
125 | (cons (vector-ref chars (bytevector-u8-ref bv i)) r)))))) | |
126 | ||
6d800a80 LC |
127 | (define base16-string->bytevector |
128 | (let ((chars->value (fold (lambda (i r) | |
129 | (vhash-consv (string-ref (number->string i 16) | |
130 | 0) | |
131 | i r)) | |
132 | vlist-null | |
133 | (iota 16)))) | |
134 | (lambda (s) | |
135 | "Return the bytevector whose hexadecimal representation is string S." | |
136 | (define bv | |
137 | (make-bytevector (quotient (string-length s) 2) 0)) | |
138 | ||
139 | (string-fold (lambda (chr i) | |
140 | (let ((j (quotient i 2)) | |
141 | (v (and=> (vhash-assv chr chars->value) cdr))) | |
142 | (if v | |
143 | (if (zero? (logand i 1)) | |
144 | (bytevector-u8-set! bv j | |
145 | (arithmetic-shift v 4)) | |
146 | (let ((w (bytevector-u8-ref bv j))) | |
147 | (bytevector-u8-set! bv j (logior v w)))) | |
148 | (error "invalid hexadecimal character" chr))) | |
149 | (+ i 1)) | |
150 | 0 | |
151 | s) | |
152 | bv))) | |
153 | ||
de4c3f26 LC |
154 | |
155 | \f | |
e0fbbc88 LC |
156 | ;;; |
157 | ;;; Filtering & pipes. | |
158 | ;;; | |
159 | ||
160 | (define (filtered-port command input) | |
161 | "Return an input port where data drained from INPUT is filtered through | |
162 | COMMAND (a list). In addition, return a list of PIDs that the caller must | |
101d9f3f LC |
163 | wait. When INPUT is a file port, it must be unbuffered; otherwise, any |
164 | buffered data is lost." | |
e0fbbc88 | 165 | (let loop ((input input) |
443eb4e9 | 166 | (pids '())) |
e0fbbc88 LC |
167 | (if (file-port? input) |
168 | (match (pipe) | |
169 | ((in . out) | |
170 | (match (primitive-fork) | |
171 | (0 | |
443eb4e9 LC |
172 | (dynamic-wind |
173 | (const #f) | |
174 | (lambda () | |
175 | (close-port in) | |
176 | (close-port (current-input-port)) | |
177 | (dup2 (fileno input) 0) | |
178 | (close-port (current-output-port)) | |
179 | (dup2 (fileno out) 1) | |
180 | (catch 'system-error | |
181 | (lambda () | |
182 | (apply execl (car command) command)) | |
183 | (lambda args | |
184 | (format (current-error-port) | |
185 | "filtered-port: failed to execute '~{~a ~}': ~a~%" | |
186 | command (strerror (system-error-errno args)))))) | |
187 | (lambda () | |
188 | (primitive-_exit 1)))) | |
e0fbbc88 LC |
189 | (child |
190 | (close-port out) | |
191 | (values in (cons child pids)))))) | |
192 | ||
193 | ;; INPUT is not a file port, so fork just for the sake of tunneling it | |
194 | ;; through a file port. | |
195 | (match (pipe) | |
196 | ((in . out) | |
197 | (match (primitive-fork) | |
198 | (0 | |
199 | (dynamic-wind | |
200 | (const #t) | |
201 | (lambda () | |
202 | (close-port in) | |
203 | (dump-port input out)) | |
204 | (lambda () | |
205 | (false-if-exception (close out)) | |
443eb4e9 | 206 | (primitive-_exit 0)))) |
e0fbbc88 LC |
207 | (child |
208 | (close-port out) | |
209 | (loop in (cons child pids))))))))) | |
210 | ||
7a8024a3 LC |
211 | (define (decompressed-port compression input) |
212 | "Return an input port where INPUT is decompressed according to COMPRESSION, | |
213 | a symbol such as 'xz." | |
214 | (match compression | |
215 | ((or #f 'none) (values input '())) | |
216 | ('bzip2 (filtered-port `(,%bzip2 "-dc") input)) | |
217 | ('xz (filtered-port `(,%xz "-dc") input)) | |
218 | ('gzip (filtered-port `(,%gzip "-dc") input)) | |
219 | (else (error "unsupported compression scheme" compression)))) | |
220 | ||
221 | (define (compressed-port compression input) | |
222 | "Return an input port where INPUT is decompressed according to COMPRESSION, | |
223 | a symbol such as 'xz." | |
224 | (match compression | |
225 | ((or #f 'none) (values input '())) | |
226 | ('bzip2 (filtered-port `(,%bzip2 "-c") input)) | |
227 | ('xz (filtered-port `(,%xz "-c") input)) | |
228 | ('gzip (filtered-port `(,%gzip "-c") input)) | |
229 | (else (error "unsupported compression scheme" compression)))) | |
230 | ||
01ac19dc LC |
231 | (define (call-with-decompressed-port compression port proc) |
232 | "Call PROC with a wrapper around PORT, a file port, that decompresses data | |
30ce8012 | 233 | read from PORT according to COMPRESSION, a symbol such as 'xz." |
01ac19dc LC |
234 | (let-values (((decompressed pids) |
235 | (decompressed-port compression port))) | |
236 | (dynamic-wind | |
237 | (const #f) | |
238 | (lambda () | |
01ac19dc LC |
239 | (proc decompressed)) |
240 | (lambda () | |
241 | (close-port decompressed) | |
242 | (unless (every (compose zero? cdr waitpid) pids) | |
243 | (error "decompressed-port failure" pids)))))) | |
244 | ||
80dea563 LC |
245 | (define (filtered-output-port command output) |
246 | "Return an output port. Data written to that port is filtered through | |
247 | COMMAND and written to OUTPUT, an output file port. In addition, return a | |
248 | list of PIDs to wait for. OUTPUT must be unbuffered; otherwise, any buffered | |
249 | data is lost." | |
250 | (match (pipe) | |
251 | ((in . out) | |
252 | (match (primitive-fork) | |
253 | (0 | |
254 | (dynamic-wind | |
255 | (const #f) | |
256 | (lambda () | |
257 | (close-port out) | |
258 | (close-port (current-input-port)) | |
259 | (dup2 (fileno in) 0) | |
260 | (close-port (current-output-port)) | |
261 | (dup2 (fileno output) 1) | |
262 | (catch 'system-error | |
263 | (lambda () | |
264 | (apply execl (car command) command)) | |
265 | (lambda args | |
266 | (format (current-error-port) | |
267 | "filtered-output-port: failed to execute '~{~a ~}': ~a~%" | |
268 | command (strerror (system-error-errno args)))))) | |
269 | (lambda () | |
270 | (primitive-_exit 1)))) | |
271 | (child | |
272 | (close-port in) | |
273 | (values out (list child))))))) | |
274 | ||
275 | (define (compressed-output-port compression output) | |
276 | "Return an output port whose input is compressed according to COMPRESSION, | |
277 | a symbol such as 'xz, and then written to OUTPUT. In addition return a list | |
278 | of PIDs to wait for." | |
279 | (match compression | |
280 | ((or #f 'none) (values output '())) | |
281 | ('bzip2 (filtered-output-port `(,%bzip2 "-c") output)) | |
282 | ('xz (filtered-output-port `(,%xz "-c") output)) | |
283 | ('gzip (filtered-output-port `(,%gzip "-c") output)) | |
284 | (else (error "unsupported compression scheme" compression)))) | |
285 | ||
01ac19dc LC |
286 | (define (call-with-compressed-output-port compression port proc) |
287 | "Call PROC with a wrapper around PORT, a file port, that compresses data | |
30ce8012 | 288 | that goes to PORT according to COMPRESSION, a symbol such as 'xz." |
01ac19dc LC |
289 | (let-values (((compressed pids) |
290 | (compressed-output-port compression port))) | |
291 | (dynamic-wind | |
292 | (const #f) | |
293 | (lambda () | |
01ac19dc LC |
294 | (proc compressed)) |
295 | (lambda () | |
296 | (close-port compressed) | |
297 | (unless (every (compose zero? cdr waitpid) pids) | |
298 | (error "compressed-output-port failure" pids)))))) | |
299 | ||
e0fbbc88 | 300 | \f |
de4c3f26 LC |
301 | ;;; |
302 | ;;; Nixpkgs. | |
303 | ;;; | |
304 | ||
305 | (define %nixpkgs-directory | |
900f7267 LC |
306 | (make-parameter |
307 | ;; Capture the build-time value of $NIXPKGS. | |
a09ec3a5 LC |
308 | (or %nixpkgs |
309 | (and=> (getenv "NIXPKGS") | |
310 | (lambda (val) | |
311 | ;; Bail out when passed an empty string, otherwise | |
312 | ;; `nix-instantiate' will sit there and attempt to read | |
313 | ;; from its standard input. | |
314 | (if (string=? val "") | |
315 | #f | |
316 | val)))))) | |
de4c3f26 | 317 | |
fbc93bed | 318 | (define* (nixpkgs-derivation attribute #:optional (system (%current-system))) |
de4c3f26 | 319 | "Return the derivation path of ATTRIBUTE in Nixpkgs." |
b86b0056 | 320 | (let* ((p (open-pipe* OPEN_READ (or (getenv "NIX_INSTANTIATE") |
00e219d1 | 321 | %nix-instantiate) |
fbc93bed LC |
322 | "-A" attribute (%nixpkgs-directory) |
323 | "--argstr" "system" system)) | |
de4c3f26 LC |
324 | (l (read-line p)) |
325 | (s (close-pipe p))) | |
326 | (and (zero? (status:exit-val s)) | |
327 | (not (eof-object? l)) | |
328 | l))) | |
329 | ||
ce5d658c LC |
330 | (define-syntax-rule (nixpkgs-derivation* attribute) |
331 | "Evaluate the given Nixpkgs derivation at compile-time." | |
332 | (compile-time-value (nixpkgs-derivation attribute))) | |
333 | ||
de4c3f26 | 334 | \f |
2cd5c038 LC |
335 | ;;; |
336 | ;;; Advisory file locking. | |
337 | ;;; | |
338 | ||
339 | (define %struct-flock | |
340 | ;; 'struct flock' from <fcntl.h>. | |
341 | (list short ; l_type | |
342 | short ; l_whence | |
343 | size_t ; l_start | |
344 | size_t ; l_len | |
345 | int)) ; l_pid | |
346 | ||
347 | (define F_SETLKW | |
348 | ;; On Linux-based systems, this is usually 7, but not always | |
349 | ;; (exceptions include SPARC.) On GNU/Hurd, it's 9. | |
350 | (compile-time-value | |
351 | (cond ((string-contains %host-type "sparc") 9) ; sparc-*-linux-gnu | |
352 | ((string-contains %host-type "linux") 7) ; *-linux-gnu | |
353 | (else 9)))) ; *-gnu* | |
354 | ||
c7445833 LC |
355 | (define F_SETLK |
356 | ;; Likewise: GNU/Hurd and SPARC use 8, while the others typically use 6. | |
357 | (compile-time-value | |
358 | (cond ((string-contains %host-type "sparc") 8) ; sparc-*-linux-gnu | |
359 | ((string-contains %host-type "linux") 6) ; *-linux-gnu | |
360 | (else 8)))) ; *-gnu* | |
361 | ||
2cd5c038 LC |
362 | (define F_xxLCK |
363 | ;; The F_RDLCK, F_WRLCK, and F_UNLCK constants. | |
364 | (compile-time-value | |
365 | (cond ((string-contains %host-type "sparc") #(1 2 3)) ; sparc-*-linux-gnu | |
366 | ((string-contains %host-type "hppa") #(1 2 3)) ; hppa-*-linux-gnu | |
367 | ((string-contains %host-type "linux") #(0 1 2)) ; *-linux-gnu | |
368 | (else #(1 2 3))))) ; *-gnu* | |
369 | ||
370 | (define fcntl-flock | |
371 | (let* ((ptr (dynamic-func "fcntl" (dynamic-link))) | |
372 | (proc (pointer->procedure int ptr `(,int ,int *)))) | |
c7445833 | 373 | (lambda* (fd-or-port operation #:key (wait? #t)) |
2cd5c038 | 374 | "Perform locking OPERATION on the file beneath FD-OR-PORT. OPERATION |
c7445833 LC |
375 | must be a symbol, one of 'read-lock, 'write-lock, or 'unlock. When WAIT? is |
376 | true, block until the lock is acquired; otherwise, thrown an 'flock-error' | |
377 | exception if it's already taken." | |
2cd5c038 LC |
378 | (define (operation->int op) |
379 | (case op | |
380 | ((read-lock) (vector-ref F_xxLCK 0)) | |
381 | ((write-lock) (vector-ref F_xxLCK 1)) | |
382 | ((unlock) (vector-ref F_xxLCK 2)) | |
383 | (else (error "invalid fcntl-flock operation" op)))) | |
384 | ||
385 | (define fd | |
386 | (if (port? fd-or-port) | |
387 | (fileno fd-or-port) | |
388 | fd-or-port)) | |
389 | ||
390 | ;; XXX: 'fcntl' is a vararg function, but here we happily use the | |
391 | ;; standard ABI; crossing fingers. | |
392 | (let ((err (proc fd | |
c7445833 LC |
393 | (if wait? |
394 | F_SETLKW ; lock & wait | |
395 | F_SETLK) ; non-blocking attempt | |
2cd5c038 LC |
396 | (make-c-struct %struct-flock |
397 | (list (operation->int operation) | |
398 | SEEK_SET | |
399 | 0 0 ; whole file | |
400 | 0))))) | |
401 | (or (zero? err) | |
402 | ||
403 | ;; Presumably we got EAGAIN or so. | |
9ea3ef26 | 404 | (throw 'flock-error (errno))))))) |
2cd5c038 LC |
405 | |
406 | \f | |
de4c3f26 LC |
407 | ;;; |
408 | ;;; Miscellaneous. | |
409 | ;;; | |
410 | ||
411 | (define (memoize proc) | |
412 | "Return a memoizing version of PROC." | |
413 | (let ((cache (make-hash-table))) | |
414 | (lambda args | |
415 | (let ((results (hash-ref cache args))) | |
416 | (if results | |
417 | (apply values results) | |
418 | (let ((results (call-with-values (lambda () | |
419 | (apply proc args)) | |
420 | list))) | |
421 | (hash-set! cache args results) | |
422 | (apply values results))))))) | |
98090557 | 423 | |
0af2c24e LC |
424 | (define (default-keyword-arguments args defaults) |
425 | "Return ARGS augmented with any keyword/value from DEFAULTS for | |
426 | keywords not already present in ARGS." | |
427 | (let loop ((defaults defaults) | |
428 | (args args)) | |
429 | (match defaults | |
430 | ((kw value rest ...) | |
431 | (loop rest | |
432 | (if (assoc-ref kw args) | |
433 | args | |
434 | (cons* kw value args)))) | |
435 | (() | |
436 | args)))) | |
437 | ||
438 | (define-syntax substitute-keyword-arguments | |
439 | (syntax-rules () | |
440 | "Return a new list of arguments where the value for keyword arg KW is | |
441 | replaced by EXP. EXP is evaluated in a context where VAR is boud to the | |
442 | previous value of the keyword argument." | |
443 | ((_ original-args ((kw var) exp) ...) | |
444 | (let loop ((args original-args) | |
445 | (before '())) | |
446 | (match args | |
447 | ((kw var rest (... ...)) | |
448 | (loop rest (cons* exp kw before))) | |
449 | ... | |
450 | ((x rest (... ...)) | |
451 | (loop rest (cons x before))) | |
452 | (() | |
453 | (reverse before))))))) | |
454 | ||
98090557 LC |
455 | (define (gnu-triplet->nix-system triplet) |
456 | "Return the Nix system type corresponding to TRIPLET, a GNU triplet as | |
457 | returned by `config.guess'." | |
458 | (let ((triplet (cond ((string-match "^i[345]86-(.*)$" triplet) | |
459 | => | |
460 | (lambda (m) | |
461 | (string-append "i686-" (match:substring m 1)))) | |
462 | (else triplet)))) | |
463 | (cond ((string-match "^([^-]+)-([^-]+-)?linux-gnu.*" triplet) | |
464 | => | |
465 | (lambda (m) | |
466 | ;; Nix omits `-gnu' for GNU/Linux. | |
467 | (string-append (match:substring m 1) "-linux"))) | |
468 | ((string-match "^([^-]+)-([^-]+-)?([[:alpha:]]+)([0-9]+\\.?)*$" triplet) | |
469 | => | |
470 | (lambda (m) | |
471 | ;; Nix strip the version number from names such as `gnu0.3', | |
472 | ;; `darwin10.2.0', etc., and always strips the vendor part. | |
473 | (string-append (match:substring m 1) "-" | |
474 | (match:substring m 3)))) | |
475 | (else triplet)))) | |
476 | ||
477 | (define %current-system | |
478 | ;; System type as expected by Nix, usually ARCHITECTURE-KERNEL. | |
d8eea3d2 LC |
479 | ;; By default, this is equal to (gnu-triplet->nix-system %host-type). |
480 | (make-parameter %system)) | |
ff352cfb | 481 | |
9c1edabd LC |
482 | (define %current-target-system |
483 | ;; Either #f or a GNU triplet representing the target system we are | |
484 | ;; cross-building to. | |
485 | (make-parameter #f)) | |
486 | ||
0d1e6ce4 MW |
487 | (define version-compare |
488 | (let ((strverscmp | |
489 | (let ((sym (or (dynamic-func "strverscmp" (dynamic-link)) | |
490 | (error "could not find `strverscmp' (from GNU libc)")))) | |
491 | (pointer->procedure int sym (list '* '*))))) | |
492 | (lambda (a b) | |
493 | "Return '> when A denotes a newer version than B, | |
494 | '< when A denotes a older version than B, | |
495 | or '= when they denote equal versions." | |
496 | (let ((result (strverscmp (string->pointer a) (string->pointer b)))) | |
497 | (cond ((positive? result) '>) | |
498 | ((negative? result) '<) | |
499 | (else '=)))))) | |
500 | ||
501 | (define (version>? a b) | |
502 | "Return #t when A denotes a newer version than B." | |
503 | (eq? '> (version-compare a b))) | |
504 | ||
7db3ff4a LC |
505 | (define (guile-version>? str) |
506 | "Return #t if the running Guile version is greater than STR." | |
507 | ;; Note: Using (version>? (version) "2.0.5") or similar doesn't work, | |
508 | ;; because the result of (version) can have a prefix, like "2.0.5-deb1". | |
509 | (version>? (string-append (major-version) "." | |
510 | (minor-version) "." | |
511 | (micro-version)) | |
512 | str)) | |
513 | ||
9b48fb88 LC |
514 | (define (package-name->name+version name) |
515 | "Given NAME, a package name like \"foo-0.9.1b\", return two values: | |
516 | \"foo\" and \"0.9.1b\". When the version part is unavailable, NAME and | |
517 | #f are returned. The first hyphen followed by a digit is considered to | |
518 | introduce the version part." | |
519 | ;; See also `DrvName' in Nix. | |
520 | ||
521 | (define number? | |
522 | (cut char-set-contains? char-set:digit <>)) | |
523 | ||
524 | (let loop ((chars (string->list name)) | |
525 | (prefix '())) | |
526 | (match chars | |
527 | (() | |
528 | (values name #f)) | |
529 | ((#\- (? number? n) rest ...) | |
530 | (values (list->string (reverse prefix)) | |
531 | (list->string (cons n rest)))) | |
532 | ((head tail ...) | |
533 | (loop tail (cons head prefix)))))) | |
534 | ||
0fdd3bea LC |
535 | (define (file-extension file) |
536 | "Return the extension of FILE or #f if there is none." | |
537 | (let ((dot (string-rindex file #\.))) | |
538 | (and dot (substring file (+ 1 dot) (string-length file))))) | |
539 | ||
ac10e0e1 LC |
540 | (define (file-sans-extension file) |
541 | "Return the substring of FILE without its extension, if any." | |
542 | (let ((dot (string-rindex file #\.))) | |
543 | (if dot | |
544 | (substring file 0 dot) | |
545 | file))) | |
546 | ||
2bcfb9e0 LC |
547 | (define (string-tokenize* string separator) |
548 | "Return the list of substrings of STRING separated by SEPARATOR. This is | |
549 | like `string-tokenize', but SEPARATOR is a string." | |
550 | (define (index string what) | |
551 | (let loop ((string string) | |
552 | (offset 0)) | |
553 | (cond ((string-null? string) | |
554 | #f) | |
555 | ((string-prefix? what string) | |
556 | offset) | |
557 | (else | |
558 | (loop (string-drop string 1) (+ 1 offset)))))) | |
559 | ||
560 | (define len | |
561 | (string-length separator)) | |
562 | ||
563 | (let loop ((string string) | |
564 | (result '())) | |
565 | (cond ((index string separator) | |
566 | => | |
567 | (lambda (offset) | |
568 | (loop (string-drop string (+ offset len)) | |
569 | (cons (substring string 0 offset) | |
570 | result)))) | |
571 | (else | |
572 | (reverse (cons string result)))))) | |
573 | ||
56b943de LC |
574 | (define* (string-replace-substring str substr replacement |
575 | #:optional | |
576 | (start 0) | |
577 | (end (string-length str))) | |
578 | "Replace all occurrences of SUBSTR in the START--END range of STR by | |
579 | REPLACEMENT." | |
580 | (match (string-length substr) | |
581 | (0 | |
582 | (error "string-replace-substring: empty substring")) | |
583 | (substr-length | |
584 | (let loop ((start start) | |
585 | (pieces (list (substring str 0 start)))) | |
586 | (match (string-contains str substr start end) | |
587 | (#f | |
588 | (string-concatenate-reverse | |
589 | (cons (substring str start) pieces))) | |
590 | (index | |
591 | (loop (+ index substr-length) | |
592 | (cons* replacement | |
593 | (substring str start index) | |
594 | pieces)))))))) | |
595 | ||
861693f3 LC |
596 | (define (call-with-temporary-output-file proc) |
597 | "Call PROC with a name of a temporary file and open output port to that | |
598 | file; close the file and delete it when leaving the dynamic extent of this | |
599 | call." | |
600 | (let* ((template (string-copy "guix-file.XXXXXX")) | |
601 | (out (mkstemp! template))) | |
602 | (dynamic-wind | |
603 | (lambda () | |
604 | #t) | |
605 | (lambda () | |
606 | (proc template out)) | |
607 | (lambda () | |
608 | (false-if-exception (close out)) | |
609 | (false-if-exception (delete-file template)))))) | |
04d4c8a4 LC |
610 | |
611 | (define (with-atomic-file-output file proc) | |
612 | "Call PROC with an output port for the file that is going to replace FILE. | |
613 | Upon success, FILE is atomically replaced by what has been written to the | |
614 | output port, and PROC's result is returned." | |
615 | (let* ((template (string-append file ".XXXXXX")) | |
616 | (out (mkstemp! template))) | |
617 | (with-throw-handler #t | |
618 | (lambda () | |
619 | (let ((result (proc out))) | |
620 | (close out) | |
621 | (rename-file template file) | |
622 | result)) | |
623 | (lambda (key . args) | |
624 | (false-if-exception (delete-file template)))))) | |
861693f3 | 625 | |
04fd96ca LC |
626 | (define fold2 |
627 | (case-lambda | |
628 | ((proc seed1 seed2 lst) | |
629 | "Like `fold', but with a single list and two seeds." | |
630 | (let loop ((result1 seed1) | |
631 | (result2 seed2) | |
632 | (lst lst)) | |
633 | (if (null? lst) | |
634 | (values result1 result2) | |
635 | (call-with-values | |
636 | (lambda () (proc (car lst) result1 result2)) | |
637 | (lambda (result1 result2) | |
638 | (loop result1 result2 (cdr lst))))))) | |
639 | ((proc seed1 seed2 lst1 lst2) | |
640 | "Like `fold', but with a two lists and two seeds." | |
641 | (let loop ((result1 seed1) | |
642 | (result2 seed2) | |
643 | (lst1 lst1) | |
644 | (lst2 lst2)) | |
645 | (if (or (null? lst1) (null? lst2)) | |
646 | (values result1 result2) | |
647 | (call-with-values | |
648 | (lambda () (proc (car lst1) (car lst2) result1 result2)) | |
649 | (lambda (result1 result2) | |
650 | (fold2 proc result1 result2 (cdr lst1) (cdr lst2))))))))) | |
651 | ||
ff352cfb LC |
652 | \f |
653 | ;;; | |
654 | ;;; Source location. | |
655 | ;;; | |
656 | ||
657 | ;; A source location. | |
658 | (define-record-type <location> | |
659 | (make-location file line column) | |
660 | location? | |
661 | (file location-file) ; file name | |
662 | (line location-line) ; 1-indexed line | |
663 | (column location-column)) ; 0-indexed column | |
664 | ||
665 | (define location | |
666 | (memoize | |
667 | (lambda (file line column) | |
668 | "Return the <location> object for the given FILE, LINE, and COLUMN." | |
669 | (and line column file | |
670 | (make-location file line column))))) | |
671 | ||
672 | (define (source-properties->location loc) | |
673 | "Return a location object based on the info in LOC, an alist as returned | |
674 | by Guile's `source-properties', `frame-source', `current-source-location', | |
675 | etc." | |
676 | (let ((file (assq-ref loc 'filename)) | |
677 | (line (assq-ref loc 'line)) | |
678 | (col (assq-ref loc 'column))) | |
5fe21fbe LC |
679 | ;; In accordance with the GCS, start line and column numbers at 1. Note |
680 | ;; that unlike LINE and `port-column', COL is actually 1-indexed here... | |
681 | (location file (and line (+ line 1)) col))) |