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02/02: doc: Emit hyperlinks in HTML output for @lisp snippets.
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guix-commits |
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Subject: |
02/02: doc: Emit hyperlinks in HTML output for @lisp snippets. |
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Date: |
Sun, 12 Apr 2020 19:22:02 -0400 (EDT) |
civodul pushed a commit to branch master
in repository guix.
commit da9deba13d551e316f5a99a614834efa27ddc7d1
Author: Ludovic Courtès <address@hidden>
AuthorDate: Mon Apr 13 00:12:20 2020 +0200
doc: Emit hyperlinks in HTML output for @lisp snippets.
This makes it easier to jump to the definition of a procedure or
variable when looking at a code snippet. There can be false-positive
because scoping rules are ignored, for example, but it should be a good
approximation.
* doc/build.scm (syntax-highlighted-html)[build](highlights->sxml*): Add
'anchors' parameter. Add clause for ('symbol text).
(syntax-highlight): Add 'anchors' parameter. Wrap body in named let and
use it in recursive calls. Pass ANCHORS to 'highlights->sxml*'.
(underscore-decode, anchor-id->key, collect-anchors, html?): New procedures.
(process-file): Add 'anchors' parameter. and honor it.
Rewrite mono-node and multi-node HTML files separately.
---
doc/build.scm | 163 ++++++++++++++++++++++++++++++++++++++++++++++------------
1 file changed, 130 insertions(+), 33 deletions(-)
diff --git a/doc/build.scm b/doc/build.scm
index 8d5b589..c3d61f8 100644
--- a/doc/build.scm
+++ b/doc/build.scm
@@ -220,8 +220,10 @@ its <pre class=\"lisp\"> blocks (as produced by 'makeinfo
--html')."
(syntax-highlight scheme)
(syntax-highlight lexers)
(guix build utils)
+ (srfi srfi-1)
(ice-9 match)
- (ice-9 threads))
+ (ice-9 threads)
+ (ice-9 vlist))
(define (pair-open/close lst)
;; Pair 'open' and 'close' tags produced by 'highlights' and
@@ -255,10 +257,11 @@ its <pre class=\"lisp\"> blocks (as produced by 'makeinfo
--html')."
level (reverse result)))
(values (reverse result) "" '())))))
- (define (highlights->sxml* highlights)
+ (define (highlights->sxml* highlights anchors)
;; Like 'highlights->sxml', but handle nested 'paren tags. This
;; allows for paren matching highlights via appropriate CSS
- ;; "hover" properties.
+ ;; "hover" properties. When a symbol is encountered, look it up
+ ;; in ANCHORS, a vhash, and emit the corresponding href, if any.
(define (tag->class tag)
(string-append "syntax-" (symbol->string tag)))
@@ -269,8 +272,16 @@ its <pre class=\"lisp\"> blocks (as produced by 'makeinfo
--html')."
(number->string
level))))
,open
(span (@ (class "syntax-symbol"))
- ,@(highlights->sxml* body))
+ ,@(highlights->sxml* body anchors))
,close))
+ (('symbol text)
+ ;; Check whether we can emit a hyperlink for TEXT.
+ (match (vhash-assoc text anchors)
+ (#f
+ `(span (@ (class ,(tag->class 'symbol))) ,text))
+ ((_ . target)
+ `(a (@ (class ,(tag->class 'symbol)) (href ,target))
+ ,text))))
((tag text)
`(span (@ (class ,(tag->class tag))) ,text)))
highlights))
@@ -301,35 +312,95 @@ its <pre class=\"lisp\"> blocks (as produced by 'makeinfo
--html')."
(pk 'unsupported-code-snippet something)
(primitive-exit 1)))))
- (define (syntax-highlight sxml)
+ (define (syntax-highlight sxml anchors)
;; Recurse over SXML and syntax-highlight code snippets.
- (match sxml
- (('*TOP* decl body ...)
- `(*TOP* ,decl ,@(map syntax-highlight body)))
- (('head things ...)
- `(head ,@things
- (link (@ (rel "stylesheet")
- (type "text/css")
- (href #$syntax-css-url)))))
- (('pre ('@ ('class "lisp")) code-snippet ...)
- `(pre (@ (class "lisp"))
- ,@(highlights->sxml*
- (pair-open/close
- (highlight lex-scheme
- (concatenate-snippets code-snippet))))))
- ((tag ('@ attributes ...) body ...)
- `(,tag (@ ,@attributes) ,@(map syntax-highlight body)))
- ((tag body ...)
- `(,tag ,@(map syntax-highlight body)))
- ((? string? str)
- str)))
-
- (define (process-html file)
+ (let loop ((sxml sxml))
+ (match sxml
+ (('*TOP* decl body ...)
+ `(*TOP* ,decl ,@(map loop body)))
+ (('head things ...)
+ `(head ,@things
+ (link (@ (rel "stylesheet")
+ (type "text/css")
+ (href #$syntax-css-url)))))
+ (('pre ('@ ('class "lisp")) code-snippet ...)
+ `(pre (@ (class "lisp"))
+ ,@(highlights->sxml*
+ (pair-open/close
+ (highlight lex-scheme
+ (concatenate-snippets code-snippet)))
+ anchors)))
+ ((tag ('@ attributes ...) body ...)
+ `(,tag (@ ,@attributes) ,@(map loop body)))
+ ((tag body ...)
+ `(,tag ,@(map loop body)))
+ ((? string? str)
+ str))))
+
+ (define (underscore-decode str)
+ ;; Decode STR, an "underscore-encoded" string as produced by
+ ;; makeinfo for indexes, such as "_0025base_002dservices" for
+ ;; "%base-services".
+ (let loop ((str str)
+ (result '()))
+ (match (string-index str #\_)
+ (#f
+ (string-concatenate-reverse (cons str result)))
+ (index
+ (let ((char (string->number
+ (substring str (+ index 1) (+ index 5))
+ 16)))
+ (loop (string-drop str (+ index 5))
+ (append (list (string (integer->char char))
+ (string-take str index))
+ result)))))))
+
+ (define (anchor-id->key id)
+ ;; Convert ID, an anchor ID such as
+ ;; "index-pam_002dlimits_002dservice" to the corresponding key,
+ ;; "pam-limits-service" in this example.
+ (underscore-decode
+ (string-drop id (string-length "index-"))))
+
+ (define* (collect-anchors file #:optional (vhash vlist-null))
+ ;; Collect the anchors that appear in FILE, a makeinfo-generated
+ ;; file. Grab those from <dt> tags, which corresponds to
+ ;; Texinfo @deftp, @defvr, etc. Return VHASH augmented with
+ ;; more name/reference pairs.
+ (define string-or-entity?
+ (match-lambda
+ ((? string?) #t)
+ (('*ENTITY* _ ...) #t)
+ (_ #f)))
+
+ (let ((shtml (call-with-input-file file html->shtml)))
+ (let loop ((shtml shtml)
+ (vhash vhash))
+ (match shtml
+ ;; Attempt to match:
+ ;; <dt>Scheme Variable: <strong>x</strong></dt>
+ ;; but not:
+ ;; <dt><code>cups-configuration</code> parameter: …</dt>
+ (('dt ('@ ('id id))
+ (? string-or-entity?) ... ('strong _ ...) _ ...)
+ (if (string-prefix? "index-" id)
+ (vhash-cons (anchor-id->key id)
+ (string-append (basename file)
+ "#" id)
+ vhash)
+ vhash))
+ ((tag ('@ _ ...) body ...)
+ (fold loop vhash body))
+ ((tag body ...)
+ (fold loop vhash body))
+ (_ vhash)))))
+
+ (define (process-html file anchors)
;; Parse FILE and perform syntax highlighting for its Scheme
;; snippets. Install the result to #$output.
(format (current-error-port) "processing ~a...~%" file)
(let* ((shtml (call-with-input-file file html->shtml))
- (highlighted (syntax-highlight shtml))
+ (highlighted (syntax-highlight shtml anchors))
(base (string-drop file (string-length #$input)))
(target (string-append #$output base)))
(mkdir-p (dirname target))
@@ -352,17 +423,43 @@ its <pre class=\"lisp\"> blocks (as produced by 'makeinfo
--html')."
(pk 'error-link file target (strerror errno))
(primitive-exit 3))))))
+ (define (html? file stat)
+ (string-suffix? ".html" file))
+
;; Install a UTF-8 locale so we can process UTF-8 files.
(setenv "GUIX_LOCPATH"
#+(file-append glibc-utf8-locales "/lib/locale"))
(setlocale LC_ALL "en_US.utf8")
+ ;; First process the mono-node 'guix.html' files.
(n-par-for-each (parallel-job-count)
- (lambda (file)
- (if (string-suffix? ".html" file)
- (process-html file)
- (copy-as-is file)))
- (find-files #$input))))))
+ (lambda (mono)
+ (let ((anchors (collect-anchors mono)))
+ (process-html mono anchors)))
+ (find-files #$input
"^guix(\\.[a-zA-Z_-]+)?\\.html$"))
+
+ ;; Next process the multi-node HTML files in two phases: (1)
+ ;; collect the list of anchors, and (2) perform
+ ;; syntax-highlighting.
+ (let* ((multi (find-files #$input "^html_node$"
+ #:directories? #t))
+ (anchors (n-par-map (parallel-job-count)
+ (lambda (multi)
+ (cons multi
+ (fold collect-anchors vlist-null
+ (find-files multi
html?))))
+ multi)))
+ (n-par-for-each (parallel-job-count)
+ (lambda (file)
+ (let ((anchors (assoc-ref anchors (dirname
file))))
+ (process-html file anchors)))
+ (append-map (lambda (multi)
+ (find-files multi html?))
+ multi)))
+
+ ;; Last, copy non-HTML files as is.
+ (for-each copy-as-is
+ (find-files #$input (negate html?)))))))
(computed-file name build))