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;; joel@jdueck.net
;; https://joeldueck.com
;; -------------------------------------------------------------------------
(require pollen/core
pollen/pagetree
pollen/setup
pollen/file
net/uri-codec
file/sha1
gregor
txexpr
racket/list
racket/system
racket/string)
;; Provides common helper functions used throughout the project
(provide maybe-meta ; Select from (current-metas) or default value ("") if not available
maybe-attr ; Return an attribute’s value or a default ("") if not available
here-output-path
here-id
series-noun ; Retrieve noun-singular from current 'series meta, or ""
series-title ; Retrieve title of series in current 'series meta, or ""
series-pagenode
attr-present? ; Test if an attribute is present
invalidate-series
make-tag-predicate
tx-strs
ymd->english
ymd->dateformat
default-authorname
default-title
articles-path
series-path
articles-folder
series-folder
articles-pagetree
series-pagetree
first-words
build-note-id
notes->last-disposition-values
disposition-values
)
(define default-authorname "Joel Dueck")
(define series-path "series")
(define articles-path "articles")
(define series-folder "series")
(define articles-folder "articles")
(define (default-title body-txprs)
(format "“~a…”" (first-words body-txprs 5)))
(define (maybe-meta m [missing ""])
(or (select-from-metas m (current-metas)) missing))
(cond [(current-metas) (or (select-from-metas m (current-metas)) missing)]
[else missing]))
;; Return the current output path, relative to (current-project-root)
;; Similar to the variable 'here' which is only accessible in Pollen templates,
;; except this is an actual path, not a string.
(define (here-output-path)
(cond [(current-metas)
(define-values (_ rel-path-parts)
(drop-common-prefix (explode-path (current-project-root))
(explode-path (string->path (select-from-metas 'here-path (current-metas))))))
(->output-path (apply build-path rel-path-parts))]
[else (error "No metas are available")]))
;; Checks current-metas for a 'series meta and returns the pagenode of that series,
;; or '|| if no series is specified.
(define (series-pagenode)
(define maybe-series (or (select-from-metas 'series (current-metas)) ""))
(cond
[(non-empty-string? maybe-series)
(->pagenode (format "~a/~a.html" series-path maybe-series))]
(->pagenode (format "~a/~a.html" series-folder maybe-series))]
[else '||]))
(define (series-noun)
(define series-pnode (series-pagenode))
(case series-pnode
['|| ""] ; no series specified
[else (or (select-from-metas 'noun-singular series-pnode) "")]))
(define (series-title)
(define series-pnode (series-pagenode))
(case series-pnode
['|| ""] ; no series specified
[else (or (select-from-metas 'title series-pnode) "")]))
;; Generates a short ID for the current article
(define (here-id [suffix #f])
(define here-hash
(substring (bytes->hex-string (sha1-bytes (path->bytes (here-output-path)))) 0 8))
(cond [(list? suffix) (apply string-append here-hash suffix)]
[(string? suffix) (string-append here-hash suffix)]
[else here-hash]))
;; “Touches” the last-modified date on the current article’s series, if there is one
(define (invalidate-series)
(define series-name (maybe-meta 'series #f))
(when series-name
(define series-file (build-path (current-project-root)
series-folder
(format "~a.poly.pm" series-name)))
(when (file-exists? series-file)
(case (system-type 'os)
[(windows) (system (format "type nul >> ~a" series-file))]
[else (system (format "touch ~a" series-file))]))))
;; ~~~ Project-wide Pagetrees ~~~
(define (include-in-pagetree folder extension)
(define (matching-file? f)
(string-suffix? f extension))
(define (file->output-pagenode f)
(string->symbol (format "~a/~a" folder (string-replace f extension ".html"))))
(define folder-path (build-path (current-project-root) folder))
(define file-strs (map path->string (directory-list folder-path)))
(map file->output-pagenode (filter matching-file? file-strs)))
(define (articles-pagetree)
`(root ,@(include-in-pagetree articles-path ".poly.pm")))
`(root ,@(include-in-pagetree articles-folder ".poly.pm")))
(define (series-pagetree)
`(root ,@(include-in-pagetree series-path ".poly.pm")))
`(root ,@(include-in-pagetree series-folder ".poly.pm")))
;; ~~~ Convenience functions for tagged x-expressions ~~~
(define (attr-present? name attrs)
(for/or ([attr-pair (in-list attrs)])
(equal? name (car attr-pair))))
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(define test-attrs '([name "Hazel"] [rank "Chief"]))
(parameterize ([current-metas test-metas])
(check-equal? (maybe-meta 'name) "Fiver") ; present meta
(check-equal? (maybe-meta 'age) "") ; missing meta
(check-equal? (maybe-meta 'age 2) 2)) ; alternate default value
(check-equal? (attr-present? 'name test-attrs) #t)
(check-equal? (attr-present? 'dingus test-attrs) #f)
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(define (build-note-id txpr)
(string-append (maybe-attr 'date (get-attrs txpr))
"_"
(uri-encode (maybe-attr 'author (get-attrs txpr) default-authorname))))
;; Extract the last disposition (if any), and the ID of the disposing note, out of a list of notes
(define (notes->last-disposition-values txprs)
(define (contains-disposition? tx) (attr-present? 'disposition (get-attrs tx)))
(define (contains-disposition? tx) (attrs-have-key? tx 'disposition))
(define disp-notes (filter contains-disposition? txprs))
(cond [(not (empty? disp-notes))
(define latest-disposition-note (last disp-notes))
(values (attr-ref latest-disposition-note 'disposition)
(build-note-id latest-disposition-note))]
[else (values "" "")]))
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