◊(Local Yarn Code "Check-in [74055398]")

@section{Constants}

@defthing[default-authorname string? #:value "Joel Dueck"]

Used as the default author name for @code{note}s, and (possibly in the future) for articles
generally.

@deftogether[(@defthing[articles-folder path-string? #:value "articles"]
              @defthing[series-folder   path-string? #:value "series"])]

The names of the folders that contain the Pollen source documents for Articles and Series
respectively, relative to the project’s document root.

@deftogether[(@defproc[(articles-pagetree) pagetree?]
              @defproc[(series-pagetree) pagetree?])]

These are project-wide pagetrees: @racket[articles-pagetree] contains a pagenode for every Pollen
document contained in @racket[articles-folder], and @racket[series-pagetree] contains a pagenode for
every Pollen document in @racket[series-folder]. The pagenodes themselves point to the rendered
@tt{.html} targets of the source documents.

@defproc[(here-output-path) path?]

Returns the path to the current output file, relative to @racket[current-project-root]. If no metas
are available, raises an error. This is like what you can get from the @tt{here} variable that Pollen
provides, except it is available outside templates.

;; ~~~ Retrieve listings of articles and notes ~~~
;; ~~~ (Mainly for use on Series pages         ~~~

;; (private) Create a WHERE clause matching a single series or list of series
(define (where/series s)
  (cond [(list? s)
         (let ([series (map (curry (format "~a/~a.html" series-folder)) s)])
           (format "WHERE `series_pagenode` IN ~a" (list->sql-values series)))]
        [(string? s)
         (format "WHERE `series_pagenode` IS \"~a/~a.html\"" series-folder s)]
        [(equal? s #t)
         (format "WHERE `series_pagenode` IS \"~a\"" (here-output-path))]
        [else ""]))

;; (private) Return a combined list of articles and notes sorted by date
(define (list/articles+notes type #:series [s #t] #:limit [limit -1] [order "DESC"])
  (define select #<<@@@@@

         series-pagenode
         make-tag-predicate
         tx-strs
         ymd->english
         ymd->dateformat
         default-authorname
         default-title
         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-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))

;; 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-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 (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-folder ".poly.pm")))

(define (series-pagetree)
  `(root ,@(include-in-pagetree series-folder ".poly.pm")))

;; ~~~ Convenience functions for tagged x-expressions ~~~

(define (maybe-attr name attrs [missing ""])
  (define result (assoc name attrs))
  (cond
    [(pair? result) (cadr result)]