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;; 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
series-noun ; Retrieve noun-singular from current 'series meta, or ""
series-title ; Retrieve title of series in current 'series meta, or ""
attr-present? ; Test if an attribute is present
disposition-values
tx-strs
ymd->english
ymd->dateformat
default-authorname
default-title
articles-path
series-path/
default-title
tx-strs
series-path
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 series-path "series")
(define articles-path "articles")
(define (default-title date)
(format "Entry of ~a" (ymd->dateformat date "d MMM YYYY")))
(define (maybe-meta m [missing ""])
(or (select-from-metas m (current-metas)) missing))
;; 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 (string-append series-path/ maybe-series ".html"))]
(->pagenode (string-append series-path "/" maybe-series ".html"))]
[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) "")]))
;; ~~~ 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 file-strs (map path->string (directory-list folder)))
(map file->output-pagenode (filter matching-file? file-strs)))
(define articles-pagetree
`(root ,@(include-in-pagetree articles-path ".poly.pm")))
(define series-pagetree
`(root ,@(include-in-pagetree series-path ".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))))
(define (maybe-attr name attrs [missing ""])
(define result (assoc name attrs))
(cond
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