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self: Speed up Texinfo cross-reference translation.

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Building guix-translated-texinfo.drv goes from 11mn to 1mn50s, most of
which is taken by po4a.

* guix/self.scm (translate-texi-manuals)[build](make-ref-regex): Remove.
(canonicalize-whitespace): New procedure.
(xref-regexp): New variable.
(translate-cross-references): Rewrite to iterate over the
cross-references rather than iterating over the msgids.  Update caller.
This commit is contained in:
Ludovic Courtès 2020-06-22 22:57:26 +02:00
parent 2f562699ea
commit a524a31de4
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GPG key ID: 090B11993D9AEBB5
1 changed files with 66 additions and 37 deletions
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103
guix/self.scm
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@ -290,6 +290,7 @@ (define build
#~(begin
(use-modules (guix build utils) (guix build po)
(ice-9 match) (ice-9 regex) (ice-9 textual-ports)
(ice-9 vlist)
(srfi srfi-1))
(mkdir #$output)
@ -315,38 +316,69 @@ (define (translate-tmp-texi po source output)
"-M" "UTF-8" "-L" "UTF-8" "-k" "0" "-f" "texinfo"
"-m" source "-p" po "-l" output))
(define (make-ref-regex msgid end)
(make-regexp (string-append
"ref\\{"
(string-join (string-split (regexp-quote msgid) #\ )
"[ \n]+")
end)))
(define (canonicalize-whitespace str)
;; Change whitespace (newlines, etc.) in STR to #\space.
(string-map (lambda (chr)
(if (char-set-contains? char-set:whitespace chr)
#\space
chr))
str))
(define (translate-cross-references content translations)
"Take CONTENT, a string representing a .texi file and translate any
cross-reference in it (@ref, @xref and @pxref) that have a translation in
TRANSLATIONS, an alist of msgid and msgstr."
(fold
(lambda (elem content)
(match elem
((msgid . msgstr)
;; Empty translations and strings containing some special characters
;; cannot be the name of a section.
(if (or (equal? msgstr "")
(string-any (lambda (chr)
(member chr '(#\{ #\} #\( #\) #\newline #\,)))
msgid))
content
;; Otherwise, they might be the name of a section, so we
;; need to translate any occurence in @(p?x?)ref{...}.
(let ((regexp1 (make-ref-regex msgid ","))
(regexp2 (make-ref-regex msgid "\\}")))
(regexp-substitute/global
#f regexp2
(regexp-substitute/global
#f regexp1 content 'pre "ref{" msgstr "," 'post)
'pre "ref{" msgstr "}" 'post))))))
content translations))
(define xref-regexp
;; Texinfo cross-reference regexp.
(make-regexp "@(px|x)?ref\\{([^,}]+)"))
(define (translate-cross-references texi translations)
;; Translate the cross-references that appear in TEXI, a Texinfo
;; file, using the msgid/msgstr pairs from TRANSLATIONS.
(define content
(call-with-input-file texi get-string-all))
(define matches
(list-matches xref-regexp content))
(define translation-map
(fold (match-lambda*
(((msgid . str) result)
(vhash-cons msgid str result)))
vlist-null
translations))
(define translated
;; Iterate over MATCHES and replace cross-references with their
;; translation found in TRANSLATION-MAP. (We can't use
;; 'substitute*' because matches can span multiple lines.)
(let loop ((matches matches)
(offset 0)
(result '()))
(match matches
(()
(string-concatenate-reverse
(cons (string-drop content offset) result)))
((head . tail)
(let ((prefix (match:substring head 1))
(ref (canonicalize-whitespace (match:substring head 2))))
(define translated
(string-append "@" (or prefix "")
"ref{"
(match (vhash-assoc ref translation-map)
(#f ref)
((_ . str) str))))
(loop tail
(match:end head)
(append (list translated
(string-take
(string-drop content offset)
(- (match:start head) offset)))
result)))))))
(format (current-error-port)
"translated ~a cross-references in '~a'~%"
(length matches) texi)
(call-with-output-file texi
(lambda (port)
(display translated port))))
(define* (translate-texi prefix po lang
#:key (extras '()))
@ -363,12 +395,9 @@ (define* (translate-texi prefix po lang
(for-each (lambda (file)
(let* ((texi (string-append file "." lang ".texi"))
(tmp (string-append texi ".tmp")))
(with-output-to-file texi
(lambda ()
(display
(translate-cross-references
(call-with-input-file tmp get-string-all)
translations))))))
(copy-file tmp texi)
(translate-cross-references texi
translations)))
(cons prefix extras))))
(define (available-translations directory domain)