◊(Local Yarn Code "Check-in [62f4a12e]")

 <nav id="bottom-nav"><ul>◊|page-nav|</ul></nav>

 ◊html$-page-body-close[]
 </html>})

;; Grabs all the articles+notes from the cache and writes out all the blog page files
(define (build-blog)
  (spell-of-summoning!) ; Turn on the DB
  
  (define arts-n-notes (slice-at (listing-htmls (articles+notes 'full #:series #f)) per-page))
  (define articles+notes (slice-at (list/articles+notes 'listing_full_html #:series #f) per-page))
  (define pagecount (length articles+notes))
  (define pagecount (length arts-n-notes))
  
  (for ([pagenum (in-range 1 (+ 1 pagecount))]
        [page    (in-list articles+notes)])
        [page    (in-list arts-n-notes)])
    (define filename (format "blog-pg~a.html" pagenum))
    (displayln (format "Writing: ~a" filename))
    (display-to-file (blog-page (apply string-append page) pagenum pagecount)
                     filename
                     #:mode 'text
                     #:exists 'replace)))

(define (main)
  ;; Do it!
  (build-blog))

#lang scribble/manual

@; SPDX-License-Identifier: BlueOak-1.0.0
@; This file is licensed under the Blue Oak Model License 1.0.0.

@(require "scribble-helpers.rkt")

@(require (for-label "../pollen.rkt"
                     "../dust.rkt"
                     "../crystalize.rkt"
                     racket/base
                     racket/contract
                     racket/string
                     deta
                     txexpr
                     pollen/template
                     pollen/pagetree
                     sugar/coerce))

@title{@filepath{crystalize.rkt}}

@defmodule["crystalize.rkt" #:packages ()]

“Crystalizing” is an extra layer in between docs and templates that destructures the doc and stores
it in various pieces in a SQLite cache. Individual articles save chunks of rendered HTML to the
cache when their individual pages are rendered. The SQLite cache is then referenced by any page that
collects multiple articles and notes together. This is much faster than fetching docs and metas
through Pollen’s cache and re-converting them to HTML.
cache when their individual pages are rendered. When pulling together listings of articles in
different contexts that need to be filtered and sorted, a SQL query is much faster than trolling
through the Pollen cache for matching docs and regenerating the HTML.

@defproc[(spell-of-summoning!) void?]
@defproc[(init-cache-db!) void?]

Initializes the SQLite database cache file. This involves creating the file
(@filepath{vitreous.sqlite}) if it does not exist, and running queries to create tables in the
database if they do not exist.
Initializes the SQLite database cache file (named @filepath{vitreous.sqlite} and located in the
project root folder) by running queries to create tables in the database if they do not exist. (The
file itself is created at the module level.)

This function is called automatically in @filepath{pollen.rkt} whenever HTML is the target output.

@defproc[(crystalize-article! [pagenode pagenode?] [doc txexpr?]) non-empty-string?]
@defproc[(parse-and-cache-article! [pagenode pagenode?] [doc txexpr?]) non-empty-string?]

Returns a string containing the HTML of @racket[_doc]. @margin-note{This is one function that breaks
my convention of using a prefix of @tt{html$-} for functions that return strings of HTML.}
Privately, it does a lot of other work. The article is saved to the SQLite cache. If the article
specifies a @racket['series] meta, information about that series is fetched and used in the
rendering of the article. If there are @racket[note]s in the doc, they are parsed and saved
individually to the SQLite cache. If any of the notes use the @code{#:disposition} attribute,
information about the disposition is parsed out and used in the rendering of the article.

my convention of using a prefix of @tt{html$-} for functions that return a single string of HTML.}

Privately, it does a lot of other work. The article is analyzed, additional metadata is constructed,
and it is saved to the SQLite cache. If the article specifies a @racket['series] meta, information
about that series is fetched and used in the rendering of the article. If there are @racket[note]s
in the doc, they are parsed and saved individually to the SQLite cache. If any of the notes use the
@code{#:disposition} attribute, information about the disposition is parsed out and used in the
rendering of the article.
@defproc[(crystalize-series!) void?]

Saves metas for the current series page in the SQLite cache. Meant to be called from the HTML
template for “Series” pages (Pollen documents located in @racket[series-folder]).

@defproc[(crystalize-index-entries! [pagenode pagenode?] [doc txexpr?]) void?]

Saves any @racket[index] enries entries in @racket[_doc] to the SQLite cache. 

@margin-note{This function was originally private; I provided it out only so it could be called
manually from @tt{index.html.pp}.}

@deftogether[(@defproc[(list/articles [type (or/c 'listing_full_html 
@deftogether[(@defproc[(<listing-full> 
                                                  'listing_short_html
                                                  'listing_excerpt_html)]
                                      [#:series series (or/c string? boolean?) #t]
                                      [#:limit limit stringish? -1]
                                 [query-func (-> any/c query?)]
                                 [#:series series (or/c string? (listof string? boolean?)) #t]
                                 [#:limit limit integer? -1]
                                      [order string? "DESC"]) (listof string?)]
              @defproc[(list/articles+notes [type (or/c 'listing_full_html 
                                                        'listing_short_html
                                                        'listing_excerpt_html)]
                                            [#:series series (or/c string? boolean?) #t]
                                            [#:limit limit stringish? -1]
                                            [order string? "DESC"]) (listof string?)])]

                                 [order stringish? 'desc]) txexpr?]
              @defproc[(<listing-excerpt>
Fetches the HTML for all articles from the SQLite cache and returns a list of strings containing the
HTML for each. The articles will be ordered by publish date according to @racket[_order] and
optionally limited to the series specified in @racket[_series].

                                 [query-func (-> any/c query?)]
If @racket[_series] expression evaluates to @racket[#f], articles will not be filtered by series. If
it evaluates to @racket[#t] (the default), articles will be filtered by those that specify the
current output of @racket[here-output-path] in their @tt{series_pagenode} column in the SQLite
cache. If a string is supplied, articles will be filtered by those containing that exact value in
their @tt{series_pagenode} column in the SQLite cache.

The @racket[_order] expression must evaluate to either @racket["ASC"] or @racket["DESC"] and the
@racket[_limit] expressions must evaluate to a value suitable for use in the @tt{LIMIT} clause of
@ext-link["https://sqlite.org/lang_select.html"]{a SQLite @tt{SELECT} statement}. An expression that
evaluates to a negative integer (the default) is the same as having no limit.

@deftogether[(@defproc[(listing<>-short/articles [#:series series (or/c string? boolean?) #t]
                                            [#:limit limit stringish? -1]
                                            [order string? "DESC"]) txexpr?]
              @defproc[(listing<>-full/articles  [#:series series (or/c string? boolean?) #t]
                                            [#:limit limit stringish? -1]
                                            [order string? "DESC"]) txexpr?])]
                                 [#:series series (or/c string? (listof string? boolean?)) #t]
                                 [#:limit limit integer? -1]
                                 [order stringish? 'desc]) txexpr?]
              @defproc[(<listing-short>
                                 [query-func (-> any/c query?)]
                                 [#:series series (or/c string? (listof string? boolean?)) #t]
                                 [#:limit limit integer? -1]
                                 [order stringish? 'desc]) txexpr?])]

@margin-note{Notice how the functions that start with @tt{list/} return lists and the functions that
start with @tt{listing<>} return fenced HTML strings. Maybe this is ugly, but it helps me keep these
otherwise too-similar sets of functions straight in my head.}

Fetches the HTML for all articles from the SQLite cache and returns the HTML strings fenced inside
a @racket['style] tagged X-expression. The articles will be ordered by publish date according to
Fetches the HTML for items from the SQLite cache and returns the HTML strings fenced inside
a @racket['style] tagged X-expression. The items will be ordered by publish date according to
@racket[_order] and optionally limited to the series specified in @racket[_series].

The @racket[_query-func] should be either @racket[articles], which will create a listing of articles
only, or @racket[articles+notes], which will include notes intermingled with articles.

@margin-note{Note that the signature shown for the @racket[_query-func] argument above is
incomplete. If you choose to pass a function other than @racket[articles] or
@racket[articles+notes], you must use a function with exactly the same signature as those
functions.}

If @racket[_series] expression evaluates to @racket[#f], articles will not be filtered by series. If
it evaluates to @racket[#t] (the default), articles will be filtered by those that specify the
current output of @racket[here-output-path] in their @tt{series_pagenode} column in the SQLite
cache. If a string is supplied, articles will be filtered by those containing that exact value in
their @tt{series_pagenode} column in the SQLite cache.

The @racket[_order] expression must evaluate to either @racket["ASC"] or @racket["DESC"] and the
@racket[_limit] expressions must evaluate to a value suitable for use in the @tt{LIMIT} clause of
@ext-link["https://sqlite.org/lang_select.html"]{a SQLite @tt{SELECT} statement}. An expression that
evaluates to a negative integer (the default) is the same as having no limit.

The reason for enclosing the results in a @racket['style] txexpr is to prevent the HTML from being
escaped by @racket[->html] in the template. This tag was picked for the job because there will
generally never be a need to include any actual CSS information inside a @tt{<style>} tag in any
page, so it can be safely filtered out later. To remove the enclosing @tt{<style>} tag, see
@racket[unfence].

@deftogether[(@defproc[(articles [type (or/c 'full 'excerpt 'short)]
@defproc[(listing<>-full/articles+notes [#:series series (or/c string? #f) #f]
                                   [#:limit limit exact-integer? -1]
                                   [order string? "DESC"]) txexpr?]
                                 [#:series series (or/c string? (listof string? boolean?)) #t]
                                 [#:limit limit integer? -1]
                                 [order stringish? 'desc]) query?]
              @defproc[(articles+notes [type (or/c 'full 'excerpt 'short)]
                                       [#:series series (or/c string? (listof string? boolean?)) #t]
                                       [#:limit limit integer? -1]
                                       [order stringish? 'desc]) query?])]

Create a query that fetches either articles only (@racket[articles]) or articles and notes
intermingled (@racket[articles+notes]), sorted by publish date and optionally limited to
a particular series.
Like @racket[listing<>-full/articles] except that notes and articles are combined side by side in
the results.

Typically you will pass these functions by name to listing functions like @racket[<listing-full>]
rather than calling them directly.

@defproc[(unfence [html string?]) string?]

Returns @racket[_html] with all occurrences of @racket["<style>"] and @racket["</style>"] removed.
The contents of the style tags are left intact.

Use this with strings returned from @racket[->html] when called on docs containing
@racket[listing<>-full/articles] or its siblings.
Use this with strings returned from @racket[->html] when called on docs that use the
@racket[<listing-full>] tag function or its siblings.

@defproc[(article-plain-title [pagenode pagenode?]) non-empty-string?]
@defparam[current-plain-title non-empty-string? #:value "void"]

Fetches the “plain” title (i.e., with no HTML markup) for the given article from the SQLite cache.
If the article did not specify a title, a default title is supplied. If the article contained
a @racket[note] that used the @code{#:disposition} attribute, the disposition-mark may be included
Contains (or sets) the “plain” title (i.e., with no HTML markup) for the current article based on
analysis done by @racket[parse-and-cache-article!]. If the article did not specify a title,
a default title is supplied. If the article contained a @racket[note] that used the
@code{#:disposition} attribute, the disposition-mark may be included in the title.
in the title.

Note that this needs to be called @emph{after} @racket[crystalize-article!] in order to get an
Note that this needs to be called @emph{after} @racket[parse-and-cache-article!] in order to get an
up-to-date value.

(define doc 
  '(root (p "If I had been astonished at first catching a glimpse of so outlandish an "
            "individual as Queequeg circulating among the polite society of a civilized "
            "town, that astonishment soon departed upon taking my first daylight "
            "stroll through the streets of New Bedford…")))
(default-title (get-elements doc))]

@defproc[(series-pagenode) pagenode?]
@defproc[(metas-series-pagenode) pagenode?]

If @code{(current-metas)} has the key @racket['series], converts its value to the pagenode pointing to
that series, otherwise returns @racket['||].

@defproc[(series-noun) string?]
@defproc[(series-metas-noun) string?]

If @code{(current-metas)} has the key @racket['series], and if the corresponding series defines a meta
value for @racket['noun-singular], then return it, otherwise return @racket[""].

@defproc[(series-title) string?]
@defproc[(series-metas-title) string?]

If @code{(current-metas)} has the key @racket['series], and if the corresponding series defines a meta
value for @racket['title], then return it, otherwise return @racket[""].

@defproc[(invalidate-series) (or/c void? boolean?)]

If the current article specifies a @racket['series] meta, and if a corresponding @filepath{.poly.pm}

@local-table-of-contents[]

@include-section["overview.scrbl"]
@include-section["pollen.scrbl"]  @; pollen.rkt
@include-section["dust.scrbl"]    @; dust.rkt
@include-section["sqlite-tools.scrbl"] @; sqlite-tools.rkt
@include-section["snippets-html.scrbl"] @; you get the idea
@include-section["crystalize.scrbl"]

#lang scribble/manual

@; SPDX-License-Identifier: BlueOak-1.0.0
@; This file is licensed under the Blue Oak Model License 1.0.0.

@(require "scribble-helpers.rkt"
          scribble/example)

@(require (for-label "../pollen.rkt"
                     "../sqlite-tools.rkt"
                     racket/base
                     racket/contract
                     db
                     sugar/coerce))

@(define my-eval (make-base-eval))
@(my-eval '(require "sqlite-tools.rkt"))

@title{@filepath{sqlite-tools.rkt}}

@defmodule["sqlite-tools.rkt" #:packages ()]

Provides a very light set of utility functions for managing a single SQLite database. These
functions are completely agnostic as to the database schema. 

It is important to note, these functions are @bold{not safe} for use with data provided by untrusted
users! In many places they use @racket[format] to blindly insert table and field names, which is
dangerous (see @secref["dbsec-sql-injection" #:doc '(lib "db/scribblings/db.scrbl")]). It’s fine for
this project, since its only use of a database is as a disposable cache that can be safely deleted
and regenerated at any time, and there are no users except me.

@section{Parameters}

@defparam[sqltools:dbc con connection? #:value "No DB connection!"]

The current database connection. This module assumes a single active connection and stores it in
this parameter so you don’t have to pass it to a function every time you execute a query. It’s
provided here so you can use it directly with the functions provided by @racketmodname[db] (all of
which are re-provided by this module for convenience).

@defboolparam[sqltools:log-queries? v #:value #f]

A kill-switch that determines whether @racket[log-query] does anything.

@section{SQL building-blocks}

@defproc[(log-query [str string?]) void?]

Prints @racket[_str] to standard output with @racket[println], but only if
@racket[(sqltools:log-queries?)] is not @code{#f}. 

This is called by every function in this module that actually executes database queries (i.e., those
whose names end in @tt{!}), so if you need to you can see what’s actually being sent to the
database.

@defproc[(backtick [str stringish?]) string?]

Returns @racket[_str] surrounded by backticks.

@examples[#:eval my-eval
(backtick "field")]

@defproc[(list->sql-fields [lst (listof stringish?)]) string?]

Given a list of values, returns a single string containing the list elements in order, surrounded
by backticks and separated by commas.

@examples[#:eval my-eval
(list->sql-fields '("id" "name" "address"))
(list->sql-fields '(or use symbols))]

@defproc[(list->sql-values [lst (listof any/c)]) string?]

Given a list of values, return a string containing those values separated by commas inside a pair of
parentheses. Any string values in the list will be surrounded by quote marks.

@examples[#:eval my-eval
(list->sql-values '(0 "hello" NULL 34))]

@defproc[(list->sql-parameters [lst (listof stringish?)]) string?]

Given a list of values, return a single string with numbered parameter placeholders, suitable for
use in a parameterized SQL query.

@examples[#:eval my-eval
(list->sql-parameters '(name rank serial))]

@deftogether[(@defproc[(bool->int [b any/c]) exact-integer?]
              @defproc[(int->bool [i exact-integer?]) boolean?])]

SQLite has no “boolean” column type (in fact SQLite has no column types, period), so boolean values
must be converted to/from the values @code{1} or @code{0}. When converting @emph{from} boolean,
@code{#f} becomes @code{0} and any other value becomes @code{1}. When converting integers @emph{to}
boolean, @code{0} becomes @code{#f} and any other value becomes @code{#t}.

@examples[#:eval my-eval
(bool->int #t)
(bool->int "")
(bool->int #f)
(int->bool 1)
(int->bool -100)
(int->bool 0)]

@defproc[(vector->hash [vec vector?] [fields (listof symbolish?)]) hash?]

Returns a hash table which uses the values in @racket[_fields] as keys and the vector elements as
the values. If @racket[_vec] and @racket[_fields] do not have the same number of elements, the
returned hash will have only as many key/value pairs as the one with the fewest elements.

The functions in Racket’s @racketmodname[db] module return query results as @seclink["vectors" #:doc
'(lib "scribblings/reference/reference.scrbl")]{vectors}, but it is much easier to make use of them
as hash tables, with the field names as keys.

@examples[#:eval my-eval
(vector->hash '#("Yossarian" "Cpt" "Z-247") '(name rank serial))

(code:comment @#,elem{When v and fields are unequal in length:})
(vector->hash '#("a" "b" "c") '(1 2))
(vector->hash '#("a" "b") '(1 2 3))]

@section{Tools for making query strings}

These functions don’t actually do anything to the database. They just convert lists into various
kinds of SQL query strings. This way you can use lists to define what you want from the database
instead of writing out the queries by hand.

Again, these functions use @racket[format] to build query strings, so they aren’t safe to use with
user-supplied data; see the warning at the top of this document.

@defproc[(make-table-schema [tablename string?] 
                            [fields (listof stringish?)]
                            [#:primary-key-cols pk-cols (listof stringish?) '()])
         string?]

Given a table name and a list of fields, returns a string containing the SQLite-flavored query that
will create that table with those fields. If @racket[_pk-cols] is empty, the first value in
@racket[_fields] is designated in the query as the primary key.

@examples[#:eval my-eval
(make-table-schema "vals" '(a b c))
(make-table-schema "vals" '(a b c) #:primary-key-cols '(a b))]

@defproc[(make-insert/replace-query [table stringish?] [fields (listof stringish?)]) string?]

Returns a SQLite-flavored query for inserting/updating a record. The list of values to insert is
parameterized so it can be used in conjunction with a @racket[list] of values.

@examples[#:eval my-eval
(make-insert/replace-query 'vals '(a b c))]

This query relies on the fact that in SQLite every table contains a @tt{rowid} column by default.
For more information on why/how the query works, see
@ext-link["https://sqlite.org/lang_insert.html"]{the SQLite docs for @tt{INSERT}}.

@defproc[(make-insert-rows-query [table stringish?] [fields (listof stringish?)] [rows (listof
(listof any/c))]) string?]

Returns a SQLite query string for inserting multiple rows.

@examples[#:eval my-eval
(make-insert-rows-query 'people '(id name) '((1 "Alice") (2 "Bob")))]

@defproc[(make-select-query [table stringish?] [fields (listof stringish?)] [#:where where-clause
stringish?]) string?]

Returns a SQLite query string for selecting rows from the database.

@examples[#:eval my-eval
(make-select-query 'vals '(a b c) #:where 1)]

@section{Query functions}

These functions actually execute queries on the currently active database connection stored in the
@racket[sqltools:dbc] parameter.

@defproc[(init-db! [filename (or/c path-string? 'memory 'temporary)] [query statement?] ...) void?]

Initialize the database connection using @racket[sqlite3-connect] with @racket['create] mode. The
filename may be followed by any number of queries which will immediately be executed on the
database; this can be useful for initializing tables and other setup tasks.

The database connection will be stored in the @racket[sqltools:dbc] parameter. If that parameter
already holds an active connection, it will be @racket[disconnect]ed and then replaced with the new
connection.

@defproc[(query! [query-statement statement?] [parameters any/c] ...) void?]

Executes a SQL statement using the current connection.

@defproc*[([(select-rows! [query statement?] [fieldnames (listof stringish?)]) (listof hash?)]
           [(select-rows! [table stringish?] [fieldnames (listof stringish?)] [where-clause
              stringish?]) (listof hash?)])]

Execute a SQL query that returns rows from the database, either using a raw query (first form
above), or using a table name, field names, and a @racket[_where-clause] (second form above).
Returns a list of hashes whose keys are the values supplied in @racket[_fieldnames].

In the first form, @racket[_fieldnames] should list @emph{in order} all the fields that will be
returned by the query. If this isn’t done, the keys for each row’s hash will likely point to values
for the wrong fields.

#lang racket/base

; SPDX-License-Identifier: BlueOak-1.0.0
; This file is licensed under the Blue Oak Model License 1.0.0.

;; Provides functions for fast preserving and fetching of article/series data.
;;  → Docs and metas go in (saved to SQLite database)
;;    HTML comes out →
;; Calling sites have no notion of the database or schema.

(require deta db/base db/sqlite3 threading txexpr gregor)
;; The functions provided by sqlite-tools.rkt are not safe for user-provided
;; data; a maliciously crafted input could bomb the database. This is acceptable
;; since the database is merely a disposable cache, and since all the input
;; will be coming from me.

(require pollen/setup
         pollen/core
(require racket/match
         racket/string
         pollen/pagetree
         pollen/template
         racket/string
         (except-in pollen/core select) ; avoid conflict with deta
         racket/function
         racket/list
         txexpr
         db/base
         "sqlite-tools.rkt"
         "snippets-html.rkt"
         pollen/setup)

(require "dust.rkt" "snippets-html.rkt")
         "dust.rkt")

;; ~~~ Provides ~~~

(provide init-cache-db!
         cache-conn            ; The most eligible bachelor in Neo Yokyo
(provide spell-of-summoning!
         crystalize-article!
         crystalize-series!
         crystalize-index-entries!
         parse-and-cache-article!
         current-plain-title
         (schema-out cache:article)
         (schema-out cache:note)
         (schema-out cache:series)
         (schema-out cache:index-entry)
         article-plain-title
         list/articles
         list/articles+notes
         listing<>-short/articles
         listing<>-full/articles
         listing<>-full/articles+notes
         unfence
         articles
         articles+notes
         listing-htmls
         <listing-full>
         <listing-excerpt>
         <listing-short>
         unfence)
         sqltools:dbc
         preheat-series!)

;; ~~~ Private use ~~~
;; Cache DB and Schemas

(define DBFILE (build-path (current-project-root) "vitreous.sqlite"))
(define DBFILE (build-path (current-project-root) "vitreous2.sqlite"))
(define cache-conn (sqlite3-connect #:database DBFILE #:mode 'create))

;; Since the DB exists to serve as a high-speed cache, the tables are constructed so that
;; the most commonly needed data can be grabbed quickly with extremely simple queries. In
(define current-plain-title (make-parameter "void"))

;; the even that you want to do something fancy and custom rather than using the pre-cooked
;; HTML, enough info is provided in the other columns to allow you to do so.
;;
(define table_articles-fields
  '(pagenode
    title_plain
    title_html_flow
    title_specified
    published
    updated
    author
    conceal
    series_pagenode
    noun_singular 
    note_count
    doc_html
    disposition
    disposition_note_id
    listing_full_html    ; Contains full content in default HTML format, but without notes
    listing_excerpt_html ; Not used for now
    listing_short_html)) ; Date and title only
(define-schema cache:article #:table "articles"
  ([id                   id/f #:primary-key #:auto-increment]
   [page                 symbol/f]
   [title-plain          string/f]
   [title-html-flow      string/f]
   [title-specified?     boolean/f]
   [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]
   [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 table_notes-fields
  '(pagenode
(define-schema cache:note #:table "notes"
  ([id                   id/f #:primary-key #:auto-increment]
   [page                 symbol/f]
    note_id
    title_html_flow
    title_plain
    author
    author_url
   [html-anchor          string/f]
   [title-html-flow      string/f] ; No block-level HTML elements
   [title-plain          string/f]
   [author               string/f]
   [author-url           string/f]
    date
    disposition
    content_html
    series_pagenode
    listing_full_html
    listing_excerpt_html  ; Not used for now
    listing_short_html))
   [published            string/f]
   [disposition          string/f]
   [content-html         string/f]
   [series-page          symbol/f]
   [listing-full-html    string/f]
   [listing-excerpt-html string/f]   ; Not used for now
   [listing-short-html   string/f])) ; Date and title only

(define table_series-fields
(define-schema cache:series #:table "series"
  '(pagenode
    title
  ([id            id/f #:primary-key #:auto-increment]
    published
    noun_plural
    noun_singular))
   [page          symbol/f]
   [title         string/f]
   [published     date/f]
   [noun-plural   string/f]
   [noun-singular string/f]))

(define table_keywordindex-fields
  '(entry
    subentry
    pagenode
    anchor))
(define-schema cache:index-entry #:table "index_entries"
  ([id          id/f #:primary-key #:auto-increment]
   [entry       string/f]
   [subentry    string/f]
   [page        symbol/f]
   [html-anchor string/f]))

(define table_articles (make-table-schema "articles" table_articles-fields))
(define table_notes (make-table-schema "notes" table_notes-fields #:primary-key-cols '(pagenode note_id)))
(define table_series (make-table-schema "series" table_series-fields))
(define table_keywordindex (make-table-schema "keywordindex"
(define-schema listing
                                              table_keywordindex-fields
                                              #:primary-key-cols '(pagenode anchor)))

  #:virtual
;; ~~~ Provided functions: Initializing; Saving posts and notes
  ([html        string/f]
   [published   date/f]
   [series-page symbol/f]))

;; Initialize the database connection, creating the database if it doesn’t
;; exist, and executing the table schema queries
;;
(define (spell-of-summoning!)
  (init-db! DBFILE table_articles table_notes table_series table_keywordindex))
(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))

;; Save an article and its notes (if any) to the database, and return the
;; rendered HTML of the complete article.
;;
(define (crystalize-article! pagenode doc)
  (define-values
    (doc2 maybe-title) (splitf-txexpr doc (make-tag-predicate 'title)))
  (define-values 
    (body-txpr note-txprs) (splitf-txexpr doc2 (make-tag-predicate 'note)))
(define (parse-and-cache-article! pagenode doc)
  (define-values (doc-no-title maybe-title)
    (splitf-txexpr doc (make-tag-predicate 'title)))
  (define-values (body-txpr note-txprs)
    (splitf-txexpr doc-no-title (make-tag-predicate 'note)))
  (define-values (disposition disp-note-id)
    (notes->last-disposition-values note-txprs))
  

  (let* ([pubdate (select-from-metas 'published (current-metas))]
         [doc-html    (->html body-txpr #:splice? #t)]
         [title-specified? (not (equal? '() maybe-title))]
         [title-val   (if (not (null? maybe-title)) (car maybe-title) (check-for-poem-title doc))]
         [title-tx    (make-article-title pagenode title-val body-txpr disposition disp-note-id)]
         [title-html  (->html title-tx #:splice? #t)]
         [title-plain (tx-strs title-tx)]
         [series-node (series-pagenode)]
         [header      (html$-article-open pagenode title-specified? title-tx pubdate)]
         [series-node (metas-series-pagenode)]
         [footertext (make-article-footertext pagenode series-node disposition disp-note-id (length note-txprs))]
         [footertext  (make-article-footertext pagenode
                                               series-node
                                               disposition
                                               disp-note-id
                                               (length note-txprs))]
         [footer (html$-article-close footertext)]
         [listing-short (html$-article-listing-short pagenode pubdate title-html)]
         [notes-section-html (crystalize-notes! pagenode title-plain note-txprs)])
         [notes-section-html (cache-notes! pagenode title-plain note-txprs)])

    (crystalize-index-entries! pagenode doc) ; Note the original doc is used here

    (cache-index-entries! pagenode doc) ; note original doc is used here
    (current-plain-title title-plain)
    ;; Values must come in the order defined in table_article_fields
    (define article-record
      (list (symbol->string pagenode)
            title-plain
            title-html
            (bool->int title-specified?)
            pubdate
            (maybe-meta 'updated)
            (maybe-meta 'author default-authorname)
            (maybe-meta 'conceal)
            (symbol->string series-node)
            (maybe-meta 'noun (series-noun))
            (length note-txprs)
            doc-html
            disposition
            disp-note-id
            (string-append header doc-html footer)
    (insert-one! cache-conn
                 (make-cache:article
                  #:page pagenode
                  #:title-plain title-plain
                  #:title-html-flow title-html
                  #:title-specified? title-specified?
                  #:published pubdate
                  #:updated (maybe-meta 'updated)
                  #:author (maybe-meta 'author default-authorname)
                  #:conceal (maybe-meta 'conceal)
                  #:series-page series-node
                  #:noun-singular (maybe-meta 'noun (series-metas-noun))
                  #:note-count (length note-txprs)
                  #:doc-html doc-html
                  #:disposition disposition
                  #:disp-html-anchor disp-note-id
                  #:listing-full-html (string-append header doc-html footer)
            "" ; listing_excerpt_html: Not yet used
            (html$-article-listing-short pagenode pubdate title-html)))

                  #:listing-excerpt-html ""
    (apply query! (make-insert/replace-query 'articles table_articles-fields) article-record)
          
                  #:listing-short-html listing-short))
    (string-append header doc-html notes-section-html footer)))

;; ~~~ 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 ""]))

;; 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 #<<@@@@@
     SELECT `~a` FROM
       (SELECT `~a`, `published`, `series_pagenode` FROM `articles`
        UNION SELECT
        `~a`,`date` AS `published`, `series_pagenode` FROM `notes`)
        ~a ORDER BY `published` ~a LIMIT ~a
@@@@@
    )
  (query-list (sqltools:dbc) (format select type type type (where/series s) order limit)))

;; Return a list of articles only, sorted by date
(define (list/articles type #:series [s #t] #:limit [limit -1] [order "DESC"])
  (define select "SELECT `~a` FROM `articles` ~a ORDER BY `published` ~a LIMIT ~a")
  (query-list (sqltools:dbc) (format select type (where/series s) order limit)))

;; ~~~~
;; Return cached HTML of articles and/or notes, fenced within a style txexpr to prevent it being
;; escaped by ->html. See also: definition of `unfence`

(define (listing<>-short/articles #:series [s #t] #:limit [limit -1] [order "DESC"])
  `(style "<ul class=\"article-list\">"
          ,@(list/articles "listing_short_html" #:series s #:limit limit order)
          "</ul>"))

(define (listing<>-full/articles #:series [s #t] #:limit [limit -1] [order "DESC"])
  `(style ,@(list/articles "listing_full_html" #:series s #:limit limit order)))

;; Return a combined list of articles and notes (“full content” version) sorted by date
(define (listing<>-full/articles+notes #:series [s #t] #:limit [limit -1] [order "DESC"])
  `(style ,@(list/articles+notes "listing_full_html" #:series s #:limit limit order)))

;; Remove "<style>" and "</style>" introduced by using ->html on docs containing output from
;; listing functions
(define (unfence html-str)
  (regexp-replace* #px"<[\\/]{0,1}style>" html-str ""))

;; ~~~ Article-related helper functions ~~~
;;

;; If the first element is a titled poem, the poem’s title can be used for the article title.
(define (check-for-poem-title doc)
  (define e1 (car (get-elements doc)))
(define (check-for-poem-title doc-txpr)
  (match (car (get-elements doc-txpr))
  (define e2 (if (null? (get-elements e1))
                 '()
                 (car (get-elements e1))))
  (cond
    [(and (txexpr? e1)
    [(txexpr 'div
          (equal? 'div (get-tag e1))
          (attrs-have-key? e1 'class)
             (list (list 'class "poem"))
          (string=? "poem" (attr-ref e1 'class))
          (not (null? e2))
          (txexpr? e2)
             (list* (txexpr 'p
          (equal? 'p (get-tag e2))
          (attrs-have-key? e2 'class)
          (string=? "verse-heading" (attr-ref e2 'class)))
     `(title (span [[class "smallcaps"]] "‘" ,@(get-elements e2) "’"))]
    [else '()]))
                            (list (list 'class "verse-heading"))
                            heading-elems)
                    _))
     `(title (span [[class "smallcaps"]] "‘" ,@heading-elems "’"))]
    [_ '()]))

;; Return a title txexpr for the current article, constructing a default if no title text was specified.
(define (make-article-title pagenode supplied-title body-tx disposition disp-note-id)
  (define title-elems
    (cond [(null? supplied-title) (list (default-title (get-elements body-tx)))]
          [else (get-elements supplied-title)]))
  
  (define disposition-part
    (cond [(non-empty-string? disposition)
           (define-values (mark _) (disposition-values disposition))
           `(a [[class "disposition-mark"] 
                [href ,(format "~a~a#~a" web-root pagenode disp-note-id)]] 
               ,mark)]
          [else ""]))
  ;; Returns a txexpr, the tag will be discarded by the template/snippets
  `(title ,@title-elems ,disposition-part))
  

;; Convert a bunch of information about an article into some nice English and links.
(define (make-article-footertext pagenode series disposition disp-note-id note-count)
  (define s-title (series-title))
  (define s-noun (series-noun))
  (define series-part
    (match (series-metas-title)
    (cond [(non-empty-string? s-title)
           (format "<span class=\"series-part\">This is ~a, part of <a href=\"/~a\">‘~a’</a>.</span>"
                   s-noun
                   series
                   s-title)]
          [else ""]))
      [(? non-empty-string? s-title)
       (format "<span class=\"series-part\">This is ~a, part of <a href=\"/~a\">‘~a’</a>.</span>"
               (series-metas-noun)
               series
               s-title)]
      [_ ""]))
  (define disp-part
    (cond [(non-empty-string? disposition)
           (define-values (mark verb) (disposition-values disposition))
           (format "Now considered <a href=\"/~a#~a\">~a</a>."
                   pagenode
                   disp-note-id
                   verb)]

           (format "There is <a href=\"/~a#furthernotes\">a note</a> appended."
                   pagenode)]
          [else ""]))
  
  (cond [(ormap non-empty-string? (list series-part disp-part notes-part))
         (string-join (list series-part disp-part notes-part))]
        [else ""]))
    

;; ~~~ Notes ~~~

;; Save a collection of ◊note tags to the DB, and return the HTML of the complete
;; “Further Notes” section at the end
;;
(define (crystalize-notes! pagenode parent-title note-txprs)
(define (cache-notes! pagenode parent-title note-txprs)
  (define (crystalizer note-tx)
    (crystalize-note! note-tx (symbol->string pagenode) parent-title))
  
  (query-exec cache-conn (delete (~> (from cache:note #:as n)
                                     (where (= n.page ,(symbol->string pagenode))))))
  (cond [(not (null? note-txprs))
  (cond [((length note-txprs) . > . 0)
         (define notes-html (map crystalizer note-txprs))
         (html$-notes-section notes-html)]
         (define note-htmls
           (for/list ([n (in-list note-txprs)])
             (cache-note! n pagenode parent-title)))
         (html$-notes-section note-htmls)]
        [else ""]))

;; Save an individual note to the DB and return the HTML of the complete note as
;; it should appear on an individual article page
;;
(define (crystalize-note! note-tx pagenode parent-title-plain)
(define (cache-note! note-tx pagenode parent-title-plain)
  (define-values (_ attrs elems) (txexpr->values note-tx))
  (define disposition-attr (maybe-attr 'disposition attrs))
  (define note-date (maybe-attr 'date attrs))
  
  ;; Check required attributes
  (unless (non-empty-string? note-date)
    (raise-arguments-error 'note "required attr missing: date" "attrs" attrs))
  (unless (or (string=? "" disposition-attr)
              (and ((length (string-split disposition-attr)) . >= . 2)))
              (>= (length (string-split disposition-attr)) 2))
    (raise-arguments-error 'note
                           "must be in format \"[symbol] [past-tense-verb]\""
                           "disposition attr"
                           disposition-attr))
  
  (define-values (disp-mark disp-verb) (disposition-values disposition-attr))
  ;; Parse out remaining columns
  (define author (maybe-attr 'author attrs default-authorname))
  (define note-id (build-note-id note-tx))
  (define title-tx (make-note-title pagenode parent-title-plain))
  (define title-html-flow (->html title-tx #:splice? #t))
  (let* ([note-id (build-note-id note-tx)]
         [title-tx (make-note-title pagenode parent-title-plain)]
         [title-html (->html title-tx #:splice? #t)]
  (define title-plain (tx-strs title-tx))
  (define author-url (maybe-attr 'author-url attrs))
         [author (maybe-attr 'author attrs default-authorname)]
         [author-url (maybe-attr 'author-url attrs)]
  (define-values (disp-mark disp-verb) (disposition-values disposition-attr))
  (define content-html (html$-note-contents disp-mark disp-verb (get-elements note-tx)))
         [content-html (html$-note-contents disp-mark disp-verb elems)])
  (define listing-full-html
    (html$-note-listing-full pagenode note-id title-html-flow note-date content-html author author-url))

  (define note-record
    (list pagenode
          note-id
          title-html-flow
          title-plain
          author
          author-url
    (insert-one! cache-conn
                 (make-cache:note
                  #:page pagenode
                  #:html-anchor note-id
                  #:title-html-flow title-html
                  #:title-plain (tx-strs title-tx)
                  #:published note-date
                  #:author author
                  #:author-url author-url
          note-date
          disposition-attr
          content-html
                  #:disposition disposition-attr
                  #:series-page (metas-series-pagenode)
                  #:content-html content-html
          (symbol->string (series-pagenode))
          listing-full-html
                  #:listing-full-html (html$-note-listing-full pagenode
          "" ; listing_excerpt_html: Not used for now
          "")) ; listing_short_html: Not used for now
  
                                                               note-id
  ;; save to db
  (define save-note-query
                                                               title-html
                                                               note-date
    (format (string-append "INSERT OR REPLACE INTO `notes` (`rowid`, ~a) "
                           "VALUES ((SELECT `rowid` FROM `notes` WHERE `pagenode` = ?1"
                           " AND `note_id` = ?2), ~a)")
                                                               content-html
            (list->sql-fields table_notes-fields)
            (list->sql-parameters table_notes-fields)))
  (apply query! save-note-query note-record)
  
  ;; return html$ of note
  (html$-note-in-article note-id note-date content-html author author-url))
                                                               author
                                                               author-url)
                  #:listing-excerpt-html ""
                  #:listing-short-html ""))
    (html$-note-in-article note-id note-date content-html author author-url)))

(define (make-note-title pagenode parent-title-plain)
  `(note-title "Re: " (a [[class "cross-reference"]
                          [href ,(format "~a~a" web-root pagenode)]]
                         ,parent-title-plain)))

(define (article-plain-title pagenode)
  (query-value (sqltools:dbc) "SELECT `title_plain` FROM `articles` WHERE `pagenode` = ?1" (symbol->string pagenode)))

;; ~~~ Keyword Index Entries ~~~

;; (private) Convert an entry key into a list of at most two elements,
;; a main entry and a sub-entry.
;;   "entry" → '("entry" "")
;;   "entry!sub" → '("entry" "sub")
;;   "entry!sub!why?!? '("entry" "sub")
(define (split-entry str)
  (define splits (string-split str "!"))
  (list (car splits)
        (cadr (append splits (list "")))))

;; Save any index entries in doc to the SQLite cache.
;; Sub-entries are specified by "!" in the index key
(define (crystalize-index-entries! pagenode doc)
  (define (index-entry? tx)
    (and (txexpr? tx)
         (string=? "index-link" (attr-ref tx 'class "")) ; see definition of html-index
         (attr-ref tx 'data-index-entry #f)))
  (define-values (_ entries) (splitf-txexpr doc index-entry?))
(define (index-entry-txpr? tx)
  (and (txexpr? tx)
       (string=? "index-link" (attr-ref tx 'class "")) ; see definition of html-index
       (attr-ref tx 'data-index-entry #f)))

(define (txexpr->index-entry tx pagenode)
  (match (split-entry (attr-ref tx 'data-index-entry))
    [(list main sub)
     (make-cache:index-entry
      #:entry main
      #:subentry sub
      #:page pagenode
      #:html-anchor (attr-ref tx 'id))]))

;; Save any index entries in doc to the SQLite cache.
;; Sub-entries are specified by "!" in the index key
(define (cache-index-entries! pagenode doc)
  (define-values (_ entry-txs) (splitf-txexpr doc index-entry-txpr?))
  ; Naive idempotence: delete and re-insert all index entries every time doc is rendered.
  (query! "DELETE FROM `keywordindex` WHERE `pagenode` = ?1" (symbol->string pagenode))
  
  (unless (null? entries)
    (define entry-rows
      (for/list ([entry-tx (in-list entries)])
        (define entry-parts (split-entry (attr-ref entry-tx 'data-index-entry)))
        (list (first entry-parts)
              (second entry-parts)
              (symbol->string pagenode)
              (attr-ref entry-tx 'id))))
    (query! (make-insert-rows-query "keywordindex" table_keywordindex-fields entry-rows))))
  (query-exec cache-conn (delete (~> (from cache:index-entry #:as entry)
                                     (where (= entry.page ,(symbol->string pagenode))))))
  (unless (null? entry-txs)
    (void
     (apply insert! cache-conn
            (for/list ([etx (in-list entry-txs)])
              (txexpr->index-entry etx pagenode))))))

;;
;;  ~~~ Fetching articles and notes ~~~
;;

;; (Private use) Conveniece function for the WHERE `series-page` clause
(define (where-series q s)
  (define (s->p x) (format "~a/~a.html" series-folder x))
  (match s
    [(list series ...)
     (where q (in a.series-page ,(map s->p series)))] ; WHERE series-page IN (item1 ...)
    [(or (? string? series) (? symbol? series))
     (where q (= a.series-page ,(s->p series)))]      ; WHERE series-page = "item"
    [#t
     (where q (= a.series-page ,(path->string (here-output-path))))]
    [_ q]))

;; 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))
  (~> (from cache:article #:as a)
      (select (fragment (ast:as (ast:qualified "a" html-field) "html"))
              a.published
              a.series-page)
      (where-series s)
      (limit ,lim)
      (order-by ([a.published ,ord]))
      (project-onto listing-schema)))

;; Builds a query that returns articles and notes intermingled chronologically
;; ~~~ Series ~~~

;; Preloads the SQLite cache with info about each series.
(define (articles+notes type #:series [s #t] #:limit [lim -1] #:order [ord 'desc])
  (define html-field (format "listing_~a_html" type))
  (~> (from (subquery
             (~> (from cache:article #:as A)
;; I may not actually need this but I’m leaving it for now.
(define (preheat-series!)
  (query! "DELETE FROM `series`")
  (define series-values
    (for/list ([series-pagenode (in-list (cdr (series-pagetree)))])
      (define series-metas (get-metas series-pagenode))
      (list (symbol->string series-pagenode)
            (hash-ref series-metas 'title)
            (hash-ref series-metas 'published)
            (hash-ref series-metas 'noun-plural "")
            (hash-ref series-metas 'noun-singular ""))))
  (define sql$-insert (make-insert-rows-query 'series table_series-fields series-values))
  (displayln sql$-insert)
                 (select (fragment (ast:as (ast:qualified "A" html-field) "html"))
                         A.published
                         A.series-page)
                 (union
                  (~> (from cache:note #:as N)
                      (select (fragment (ast:as (ast:qualified "N" html-field) "html"))
                              N.published
                              N.series-page)))))
            #:as a)
      (where-series s)
      (limit ,lim)
      (order-by (["published" ,ord]))
      (project-onto listing-schema)))

;; Get all the a list of the HTML all the results in a query
(define (listing-htmls list-query)
  (for/list ([l (in-entities cache-conn list-query)])
    (listing-html l)))

;; Return cached HTML of articles and/or notes, fenced within a style txexpr to prevent it being
;; escaped by ->html. See also: definition of `unfence`

;; E.g.: (<listing-full> articles+notes)
(define (<listing-full> query-func #:series [s #t] #:limit [lim -1] #:order [ord 'desc])
  `(style ,@(listing-htmls (query-func 'full #:series s #:limit lim #:order ord))))
;;                                     ^^^^^

(define (<listing-excerpt> query-func #:series [s #t] #:limit [lim -1] #:order [ord 'desc])
  `(style ,@(listing-htmls (query-func 'excerpt #:series s #:limit lim #:order ord))))
;;                                     ^^^^^^^^

(define (<listing-short> query-func #:series [s #t] #:limit [lim -1] #:order [ord 'desc])
  `(style "<ul class=\"article-list\">"
          ,@(listing-htmls (query-func 'short #:series s #:limit lim #:order ord))
          "</ul>")) ;;                 ^^^^^^

;; Remove "<style>" and "</style>" introduced by using ->html on docs containing output from
;; listing functions
  (query! sql$-insert))
(define (unfence html-str)
  (regexp-replace* #px"<[\\/]{0,1}style>" html-str ""))

;; Save the current article to the `series` table of the SQLite cache
;; Should be called from a template for series pages
(define (crystalize-series!)
  (define series-row
    (list (path->string (here-output-path))
          (hash-ref (current-metas) 'title)
          (hash-ref (current-metas) 'published "")
          (hash-ref (current-metas) 'noun-plural "")
          (hash-ref (current-metas) 'noun-singular "")))
(define (cache-series!)
  (query-exec cache-conn
              (delete (~> (from cache:series #:as s)
                          (where (= s.page ,(here-output-path))))))
  (insert-one! cache-conn
               (make-cache:series
                #:page (here-output-path)
                #:title (hash-ref (current-metas) 'title)
                #:published (hash-ref (current-metas) 'published "")
                #:noun-plural (hash-ref (current-metas) 'noun-plural "")
                #:noun-singular (hash-ref (current-metas) 'noun-singular ""))))
  (apply query! (make-insert/replace-query 'series table_series-fields) series-row))

;; 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
         series-metas-noun    ; Retrieve noun-singular from current 'series meta, or ""
         series-metas-title   ; Retrieve title of series in current 'series meta, or ""
         metas-series-pagenode
         invalidate-series
         make-tag-predicate
         tx-strs
         ymd->english
         ymd->dateformat
         default-authorname
         default-title

           (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 (string->path ".")]))

;; Checks current-metas for a 'series meta and returns the pagenode of that series,
;; or '|| if no series is specified.
(define (series-pagenode)
(define (metas-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)) 
(define (series-metas-noun)
  (define series-pnode (metas-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)) 
(define (series-metas-title)
  (define series-pnode (metas-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

#lang pollen

◊; SPDX-License-Identifier: BlueOak-1.0.0
◊; This file is licensed under the Blue Oak Model License 1.0.0.

◊(require pollen/template db/base racket/list racket/match)

◊(define (fetch-series)
  (define q "SELECT noun_plural, pagenode, title FROM series ORDER BY noun_plural DESC")
  (query-rows (sqltools:dbc) q))
  (define q "SELECT noun_plural, page, title FROM series ORDER BY noun_plural DESC")
  (query-rows cache-conn q))

◊(define (series-item->txpr s)
  (match-define (list n pagenode title) s)
  `(li (a [[href ,pagenode]] (i ,title))))

◊(define (series-grouped-list)
  ;; Produces '((("noun1" "p.html" "Title") ("noun1" "q.html" "Title")) (("noun2" ...) ...))

  (cond [(non-empty-string? subhead) (add-new-subentry e record)]
        [else (add-entry-link e record)]))

;; Get the index entries from the SQLite cache, return them as a list of vectors (Records!)
(define (fetch-entries)
  (define q
    ◊string-append{
 SELECT entry, subentry, a.rowid, "◊web-root" || k.pagenode || "#" || anchor AS href, title_plain
 FROM keywordindex k INNER JOIN articles a
 ON a.pagenode = k.pagenode
 SELECT entry, subentry, a.rowid, "◊web-root" || k.page || "#" || html_anchor AS href, title_plain
 FROM index_entries k INNER JOIN articles a
 ON a.page = k.page
 ORDER BY entry COLLATE NOCASE ASC, subentry COLLATE NOCASE ASC;})
  (query-rows (sqltools:dbc) q))
  (query-rows cache-conn q))

;; Convert a list of vectors from the cache DB into a list of the form:
;; ((FIRST-LETTER (entries ...)) ...)
;; The method relies on the records being pre-sorted by the SQL query.
(define (group-entries records)
  (define collated
    (for/fold ([entries (list (new-entry (first records)))]

 <div id="keywordindex">
 ◊the-index
 </div>
 ◊html$-page-body-close[]
 </html>})

(define (main)
  (spell-of-summoning!) ; Turn on DB
  (displayln "Writing keyword-index.html…")
  (display-to-file (html$-keywordindex-page (html$-index (group-entries (fetch-entries))))
                   "keyword-index.html"
                   #:mode 'text
                   #:exists 'replace))

    (map resolve-module-path
         (list tags-html.rkt
               snippets-html.rkt
               dust.rkt
               crystalize.rkt))))

(case (current-poly-target)
  [(html) (spell-of-summoning!)])
  [(html) (init-cache-db!)])

;; Macro for defining tag functions that automatically branch based on the 
;; current output format and the list of poly-targets in the setup module.
;; Use this macro when you know you will need keyword arguments.
;;
(define-syntax (poly-branch-kwargs-tag stx)
  (syntax-parse stx

      (date->string now #t)))
  (string-append timestamp "Z"))

;; Get the data out of the SQLite cache as vectors
(define (fetch-rows)
  (define fields '(pagenode title_plain published updated author doc_html))
  (define select #<<---
     SELECT `path`, `title`, `published`, `updated`, `author`, `entry-contents` FROM
       (SELECT `pagenode` AS `path`,
     SELECT `path`, `title`, `published`, `updated`, `author`, `entry_contents` FROM
       (SELECT `page` AS `path`,
               `title_plain` AS `title`,
               `published`,
               `updated`,
               `author`,
               `doc_html` AS `entry-contents`
               `doc_html` AS `entry_contents`
        FROM `articles`
        UNION
        SELECT `pagenode` || '#' || `note_id` AS `path`,
        SELECT `page` || '#' || `html_anchor` AS `path`,
               `title_plain` AS `title`,
               `date` AS `published`,
               `published`,
               "" AS `updated`,
               `author`,
               `content_html` as `entry-contents`
               `content_html` as `entry_contents`
        FROM `notes`)
        ORDER BY `published` DESC LIMIT ~a
---
    )
  (query-rows (sqltools:dbc) (format select feed-item-limit)))
  (query-rows cache-conn (format select feed-item-limit)))

(define (vector->rss-item vec)
  (match-define
    (vector path title published updated author contents) vec)
  (define entry-url (string-append feed-site-url web-root path))
  (define update-ts
    (cond [(non-empty-string? updated) updated]

            (name ,feed-author)
            (email ,@(email-encode feed-author-email)))
           ,@(map vector->rss-item (fetch-rows))))
  (string-append "<?xml version=\"1.0\" encoding=\"utf-8\"?>\n"
                 (xexpr->string feed-xpr)))

(define (main)
  (spell-of-summoning!) ; Turn on the cache DB connection
  (display-to-file (rss-feed) "feed.xml" #:mode 'text #:exists 'replace))

<!DOCTYPE html>
<html lang="en">
◊crystalize-series!
◊cache-series![]
◊html$-page-head[(select-from-metas 'title metas)]

◊html$-page-body-open["series-page"]

◊(unfence (->html doc #:splice? #t))

◊html$-page-body-close[]

</html>

  (define maybe-author-class
    (cond [(string=? author default-authorname) "by-proprietor"]
          [else ""]))
  
  ◊string-append{
 <article class="with-title ◊maybe-author-class hentry">
 <h1 class="entry-title note-full">◊|title-html-flow|</h1>
 <p class="time"><a href="/◊|pagenode|#◊note-id" class="rel-bookmark note-permlink">
 <p class="time"><a href="/◊(symbol->string pagenode)#◊note-id" class="rel-bookmark note-permlink">
 <time datetime="◊date">◊ymd->english[date]</time>
 </a></p>
 <section class="entry-content">
 <div class="p-content p-name">◊|contents|</div>
 ◊author-part
 </section>
 </article>})

#lang racket/base

; SPDX-License-Identifier: BlueOak-1.0.0
; This file is licensed under the Blue Oak Model License 1.0.0.

;; Provides a very light set of utility functions for a SQLite database.
;; These functions are completely agnostic as to the database schema.
;; These functions are NOT SAFE for use with data provided by untrusted users!

(require db/sqlite3
         db/base
         racket/list
         racket/match
         racket/function
         racket/contract
         sugar/coerce)

(module+ test
  (require rackunit))

(provide sqltools:dbc
         sqltools:log-queries?)

(provide
 (contract-out
  ;; Utility functions
  [log-query                 (string? . -> . void?)]
  [vector->hash              (vector? (listof symbolish?) . -> . hash?)]
  [backtick                  (stringish? . -> . string?)]
  [list->sql-fields          ((listof stringish?) . -> . string?)]
  [list->sql-values          ((listof stringish?) . -> . string?)]
  [list->sql-parameters      ((listof any/c) . -> . string?)]
  [bool->int                 (any/c . -> . exact-integer?)]
  [int->bool                 (exact-integer? . -> . boolean?)]

  ;; Simple SQL makers
  [make-table-schema         ((string? (listof stringish?))
                              (#:primary-key-cols (listof stringish?))
                              . ->* . string?)]
  [make-insert/replace-query (stringish? (listof stringish?) . -> . string?)]
  [make-insert-rows-query    (stringish? (listof stringish?) (listof (listof stringish?)) . -> . string?)]
  [make-select-query         (stringish? (listof stringish?) #:where stringish? . -> . string?)]

  ;; Database operations
  [init-db!                  ((pathish?) () #:rest (listof string?) . ->* . void?)]
  [query!                    ((string?) () #:rest (listof any/c) . ->* . void?)]
  [select-rows!              (case->
                              (stringish? (listof stringish?) any/c . -> . (or/c empty? hash?))
                              (string? (listof stringish?) . -> . (or/c empty? hash?)))]))

;; ~~~ Private use ~~~

(define uninitialized-connection "No DB connection!")
(define (weave xs ys)
  (for/fold [(woven null)
             #:result (reverse woven)]
            ([x (in-list xs)]
             [y (in-list ys)])
    (cons y (cons x woven))))

(define (sql-val v)
  (cond [(string? v) (string-append "\"" v "\"")]
        [else (format "~a" v)]))

;; ~~~ Provided parameters ~~~

(define sqltools:dbc (make-parameter uninitialized-connection))
(define sqltools:log-queries? (make-parameter #f))

;; ~~~ Provided utility functions ~~~

(define (backtick str) (format "`~a`" str))
(define (list->sql-fields fields) (apply string-append (add-between (map backtick fields) ", ")))
(define (list->sql-values vals)
  (string-append "(" (apply string-append (add-between (map sql-val vals) ", ")) ")"))
(define (list->sql-parameters fields)
  (apply string-append (add-between (map (λ(x) (format "?~a" (add1 x))) (range (length fields))) ", ")))

;; For storing/reading boolean values (SQLite uses integers)
(define (bool->int b?)
  (cond [b? 1] [else 0]))

(define (int->bool i)
  (not (= i 0)))

;; TESTING: utility functions…
(module+ test
  (check-equal? (backtick "field") "`field`")
  (check-equal? (list->sql-fields '("f1" "f2" "f3")) "`f1`, `f2`, `f3`")
  (check-equal? (list->sql-fields '(f1 f2 f3)) "`f1`, `f2`, `f3`") ; Can use symbols too
  (check-equal? (list->sql-parameters '("name" "rank" "serial")) "?1, ?2, ?3")
  (check-equal? (list->sql-parameters '(name rank serial)) "?1, ?2, ?3")
  (check-equal? (list->sql-values '(100 "hello" 3)) "(100, \"hello\", 3)")
  (check-equal? (weave '(x y z) '(1 2 3)) '(x 1 y 2 z 3))
  
  (check-equal? (bool->int #f) 0)
  (check-equal? (bool->int #t) 1)
  (check-equal? (bool->int "xblargh") 1)
  (check-equal? (int->bool 0) #f)
  (check-equal? (int->bool 1) #t)
  (check-equal? (int->bool -1) #t)
  (check-equal? (int->bool 37) #t)
  (check-exn exn:fail? (lambda () (int->bool "x"))))

;; ~~~ Public functions ~~~

;; Prints to stdout if logging is on
(define (log-query q) (unless (not (sqltools:log-queries?)) (println q)))

;; Using a list of field names, convert a vector into a hash that uses the
;; field names (in symbol form) for keys.
;; Racket’s db functions all return vectors; hashes are much easier to use.
;; If fields and v are not equal in length, the unpairable elements are omitted
;; from the hash!
(define (vector->hash v fields)
  (cond [(zero? (vector-length v)) null]
        [else (let ([keys (map ->symbol fields)]
                    [vals (vector->list v)])
                (apply hash (weave keys vals)))]))

;; TESTING: vector->hash...
(module+ test
  (let ([test-row '#("Joe" "PFC" 123)]
        [test-cols-SYMBOL '(name rank serial)]
        [test-cols-STRING '("name" "rank" "serial")]
        [desired-result '#hash((serial . 123) (rank . "PFC") (name . "Joe"))])
    (check-equal? (vector->hash test-row test-cols-SYMBOL) desired-result)
    (check-equal? (vector->hash test-row test-cols-STRING) desired-result))

  ;; Behavior when v and fields are unequal in length:
  (check-equal? (vector->hash '#("foo" "bar") '(a b c))
                '#hash((a . "foo") (b . "bar")))
  (check-equal? (vector->hash '#("foo" "bar" "baz") '(a b))
                '#hash((a . "foo") (b . "bar"))))

;; Create a simple table schema from a list of fields, optionally specifying
;; primary key
(define (make-table-schema tablename fields #:primary-key-cols [primary-cols '()])
  (define primary-key
    (format "PRIMARY KEY (~a)"
            (list->sql-fields (if (empty? primary-cols) (list (first fields)) primary-cols))))
  (format "CREATE TABLE IF NOT EXISTS `~a` (~a, ~a);"
          tablename
          (list->sql-fields fields)
          primary-key))

;; Create a query that inserts a row if it doesn’t exist (based on the first
;; column only), or updates it if it does. The returned query is parameterized,
;; and must be used with a list of values equal in length to the number of
;; fields given.
(define (make-insert/replace-query tablename fields)
  (format "INSERT OR REPLACE INTO `~a` (`rowid`, ~a) VALUES ((SELECT `rowid` FROM `~a` WHERE `~a`= ?1), ~a)"
          tablename
          (list->sql-fields fields)
          tablename
          (first fields)
          (list->sql-parameters fields)))

;; Create a query that inserts multiple rows.
(define (make-insert-rows-query tablename fields rows)
  (define row-values
    (apply string-append (add-between (map list->sql-values rows) ", ")))
  (format "INSERT INTO `~a` (~a) VALUES ~a;" tablename (list->sql-fields fields) row-values))

;; Simple row selection
(define (make-select-query table fields #:where where-clause)
  (format "SELECT ~a FROM `~a` WHERE ~a"
          (list->sql-fields fields)
          table
          where-clause))

;; TESTING: SQL query makers...
(module+ test
  (check-equal? (make-table-schema 'posts '(title date))
                "CREATE TABLE IF NOT EXISTS `posts` (`title`, `date`, PRIMARY KEY (`title`));")
  (check-equal? (make-table-schema "posts" '("title" "date"))
                "CREATE TABLE IF NOT EXISTS `posts` (`title`, `date`, PRIMARY KEY (`title`));")
  (check-equal? (make-table-schema 'posts '(title date) #:primary-key-cols '(author date))
                "CREATE TABLE IF NOT EXISTS `posts` (`title`, `date`, PRIMARY KEY (`author`, `date`));")

  (check-equal? (make-insert/replace-query 'posts '(author title))
                (string-append "INSERT OR REPLACE INTO `posts` (`rowid`, `author`, `title`) "
                               "VALUES ((SELECT `rowid` FROM `posts` WHERE `author`= ?1), ?1, ?2)"))

  (check-equal? (make-insert-rows-query 'series '(id name num) '((1 "Journal" 11) (2 "Ideas" 4)))
                (string-append "INSERT INTO `series` (`id`, `name`, `num`) "
                               "VALUES (1, \"Journal\", 11), (2, \"Ideas\", 4);"))
  
  (check-equal? (make-select-query 'posts '(author title) #:where 1)
                "SELECT `author`, `title` FROM `posts` WHERE 1"))

(define (good-connection?)
  (and (connection? (sqltools:dbc)) (connected? (sqltools:dbc))))

;; Initialize the database connection, creating the database if it does not yet exist
;; and running any provided queries (e.g., "CREATE TABLE IF NOT EXISTS...")
(define (init-db! filename . qs)
  (cond [(good-connection?) (disconnect (sqltools:dbc))])
  (sqltools:dbc (sqlite3-connect #:database filename #:mode 'create))
  (unless (empty? qs)
    (for ([q (in-list qs)])
         (query! q))))

;; Run a query with logging (if enabled) and return the result
(define (query! q . parameters)
  (unless (good-connection?) (error "(query!) DB not connected"))
  (log-query q)
  (cond [(empty? parameters) (query-exec (sqltools:dbc) q)]
        [else (apply query-exec (sqltools:dbc) q parameters)]))

;; Run a SELECT query, return a hash with field names as keys
(define select-rows!
  (case-lambda
    ;; Use arbitrary query
    [(query fieldnames)
     (unless (good-connection?) (error "(select-rows!) DB not connected"))
     (log-query query)
     (define result (query-rows (sqltools:dbc) query))
     (map (curryr vector->hash fieldnames) result)]
    
    ;; Use a simple SELECT FROM WHERE template
    [(table fields where-clause)
     (unless (good-connection?) (error "(select-rows!) DB not connected"))
     (define query (make-select-query table fields #:where where-clause))
     (log-query query)
     (define result (query-rows (sqltools:dbc) query))
     (map (curryr vector->hash fields) result)]))

;; TESTING: database connection state and queries
(module+ test
  (define TESTDB "SQLITE-TOOLS-TEST.sqlite")

  ;; Check that things start out uninitialized and that queries don’t work
  (check-equal? (sqltools:dbc) uninitialized-connection)
  (check-false (file-exists? TESTDB))
  (check-exn exn:fail? (lambda () (query! "SELECT 1")))
  (check-exn exn:fail? (lambda () (select-rows! 'posts '(title) 1)))
  
  ;; Initialize db connection, create file with no schema
  (test-begin
   (check-equal? (init-db! TESTDB) (void))
   (check-true (file-exists? TESTDB))
   (delete-file TESTDB))

  ;; Initialize new db/connection, create file with schema, check that
  ;; simple queries return expected results
  (test-begin
   (check-equal? (init-db! TESTDB (make-table-schema 'posts '(title date))) (void))
   (check-true (file-exists? TESTDB))
   (check-equal? (select-rows! (make-select-query 'posts '(title date) #:where 1) '(title date)) null)
   (check-equal? (query! (make-insert/replace-query 'posts '(title date)) "Hello" "2018-08-10") (void))
   (check-equal? (select-rows! 'posts '(title date) "`date`='2018-08-10'")
                 '(#hash((title . "Hello") (date . "2018-08-10")))))

  ;; Clean up
  (disconnect (sqltools:dbc))
  (sqltools:dbc uninitialized-connection)
  (delete-file TESTDB))

<!DOCTYPE html>
◊; SPDX-License-Identifier: BlueOak-1.0.0
◊; This file is licensed under the Blue Oak Model License 1.0.0.
<html lang="en">

◊(define article-html (crystalize-article! here doc))
◊(define article-html (parse-and-cache-article! here doc))
◊(define page-title (article-plain-title here))
◊html$-page-head[page-title]
◊html$-page-head[(current-plain-title)]

◊html$-page-body-open[]

◊article-html

◊html$-page-body-close[]

</html>