◊(Local Yarn Code "Diff")

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   [published            string/f]
   [updated              string/f]
   [author               string/f]
   [conceal              string/f]
   [series-page          symbol/f]
   [noun-singular        string/f]
   [note-count           integer/f]
   [doc-html             string/f]
   [content-html             string/f]
   [disposition          string/f]
   [disp-html-anchor     string/f]
   [listing-full-html    string/f]   ; full content but without notes
   [listing-excerpt-html string/f]   ; Not used for now
   [listing-short-html   string/f])) ; Date and title only

(define-schema cache:note #:table "notes"
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   [entry       string/f]
   [subentry    string/f]
   [page        symbol/f]
   [html-anchor string/f]))

(define-schema listing
  #:virtual
  ([html        string/f]
   [published   date/f]
   [series-page symbol/f]))
  ([path        string/f]
   [title       string/f]
   [author      string/f]
   [published   string/f]
   [updated     string/f]
   [html        string/f]))

(define (init-cache-db!)
  (create-table! (cache-conn) 'cache:article)
  (create-table! (cache-conn) 'cache:note)
  (create-table! (cache-conn) 'cache:series)
  (create-table! (cache-conn) 'cache:index-entry))

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;; Needed to "parameterize" column names
;; see https://github.com/Bogdanp/deta/issues/14#issuecomment-573344928
(require (prefix-in ast: deta/private/ast))

;; Builds a query to fetch articles
(define (articles type #:series [s #t] #:limit [lim -1] #:order [ord 'desc])
  (define html-field (format "listing_~a_html" type))
  (define html-field
    (match type
      ['content "content_html"]
      [_ (format "listing_~a_html" type)]))
  (~> (from cache:article #:as a)
      (select (fragment (ast:as (ast:qualified "a" html-field) "html"))
      (select (as a.page path)
              (as a.title-plain title)
              a.author
              a.published
              a.series-page
              a.conceal)
              a.updated
              (fragment (ast:as (ast:qualified "a" html-field) "html")))
      (where-series s)
      (where-not-concealed)
      (limit ,lim)
      (order-by ([a.published ,ord]))
      (project-onto listing-schema)))

;; Builds a query that returns articles and notes intermingled chronologically
(define (articles+notes type #:series [s #t] #:limit [lim -1] #:order [ord 'desc])
  (define html-field (format "listing_~a_html" type))
  (define html-field
    (match type
      ['content "content_html"]
      [_ (format "listing_~a_html" type)]))
  (~> (from (subquery
             (~> (from cache:article #:as A)
                 (select (fragment (ast:as (ast:qualified "A" html-field) "html"))
                         A.published
                         A.series-page
                         A.conceal)
                 (select 
                  (as A.page path)
                  (as A.title-plain title)
                  A.author
                  A.published
                  A.updated
                  (fragment (ast:as (ast:qualified "A" html-field) "html"))
                  A.series-page
                  A.conceal)
                 (union
                  (~> (from cache:note #:as N)
                      (select (fragment (ast:as (ast:qualified "N" html-field) "html"))
                              N.published
                              N.series-page
                              N.conceal)))))
                      (select 
                       (as (array-concat N.page "#" N.html-anchor) path)
                       (as N.title-plain title)
                       N.author
                       N.published
                       (as "" updated) 
                       (fragment (ast:as (ast:qualified "N" html-field) "html"))
                       N.series-page
                       N.conceal)))))
            #:as a)
      (where-series s)
      (where-not-concealed)
      (limit ,lim)
      (order-by ([a.published ,ord]))
      (project-onto listing-schema)))