#lang scribble/manual
@; Copyright (c) 2019 Joel Dueck
@;
@; Copying and distribution of this file, with or without modification,
@; are permitted in any medium without royalty provided the copyright
@; notice and this notice are preserved. This file is offered as-is,
@; without any warranty.
@(require "scribble-helpers.rkt")
@(require (for-label "../pollen.rkt"
"../dust.rkt"
"../snippets-html.rkt"
racket/base
racket/contract
racket/string
pollen/template
pollen/pagetree
txexpr
sugar/coerce))
@title{@filepath{snippets-html.rkt}}
@defmodule["snippets-html.rkt" #:packages ()]
Each “snippet” module provides all the document- and article-level blocks of structural markup
necessary for a particular target output format; this one is for HTML. The idea is that any block of
markup that might be reused across more than one template should be a function.
The functions in the snippets modules follow two conventions in this project:
@itemlist[
@item{Functions that return strings of HTML have the prefix @tt{html$-}.}
@item{Such functions do not do any parsing or destructuring of complex objects; every separate
piece that will be inserted into the template is passed in as a separate argument. This makes it
harder to change the scope of what a snippet does, but makes things faster since all the parsing
can happen in one place, before the snippet functions are called.} ]
@section{Using @tt{pollen/mode}}
It’s worth looking at the source for this file to see how @racketmodname[pollen/mode] can be used to
make it easy to write “mini-template” functions:
@codeblock{
#lang pollen/mode racket/base
(define (html$-my-article title body-tx)
◊string-append{
<p><b>◊|title|</b><p>
◊(->html body-tx)
})
}
@section{HTML Snippet functions}
@defproc[(html$-page-head [title (or/c string? #f) #f]) non-empty-string?]
Returns the @tt{<head>} section of an HTML document.
@defproc[(html$-page-body-open [body-class string? ""]) non-empty-string?]
Returns the opening @tt{<body>} and @tt{<main>} tags and elements that immediately follow, such as
site header, logo and navigation.
If @racket[_body-class] is a non-empty string, its contents will be included in the @tt{class}
attribute of the @tt{<body>} tag.
@defproc[(html$-article-open [pagenode pagenode?]
[title-specified-in-doc? boolean?]
[title txexpr?]
[pubdate string?])
non-empty-string?]
Returns the opening @tt{<article>} tag and elements that immediately follow: permlink, publish date,
and opening @tt{<section>} tag.
The @racket[_title-specified-in-doc?] form changes the HTML markup structure used.
@defproc[(html$-article-close [footertext string?]) non-empty-string?]
Returns a string containing a closing @tt{<section>} tag, a @tt{<footer>} element containing
@racket[_footertext], and a closing @tt{<article>} tag. If @racket[_footertext] is empty, the
@tt{<footer>} element will be omitted.
@defproc[(html$-article-listing-short [pagenode pagenode?] [pubdate string?] [title string?])
non-empty-string?]
Returns a string of HTML for an article as it would appear in a listing context in “short” form
(date and title only, with link).
@defproc[(html$-page-body-close) non-empty-string?]
Returns a string containing the page’s @tt{<footer>} and closing tags.
@defproc[(html$-note-title [author string?] [pagenode pagenode?] [parent-title string?])
non-empty-string?]
Returns a string containing the HTML for a note’s title. The title is used when the note is
displayed in a separate context from its parent article.
If @racket[_author] is empty, then @racket[default-authorname] is used. The @racket[_pagenode] and
@racket[_parent-title] values are for generating a link to the parent article.
@defproc[(html$-note-contents [disposition-mark string?] [elems (listof xexpr?)]) non-empty-string?]
Returns a string containing the body-elements of a note converted to HTML. If
@racket[_disposition-mark] is not empty, a @tt{<span>} containing it will be inserted as the first
element of the first block-level element.
@defproc[(html$-note-listing-full [pagenode pagenode?]
[note-id string?]
[title-html-flow string?]
[date string?]
[contents string?]
[author string? (default-authorname)]
[author-url string? ""])
non-empty-string?]
Returns a string containing the complete HTML markup for a @racket[note], including title, permlink,
date, contents and author, suitable for display outside the context of its parent article.
@defproc[(html$-note-in-article [id string?]
[date string?]
[contents string?]
[author string?]
[author-url string?]) non-empty-string?]
Like @racket[html$-note-listing-full], but returns HTML for a @racket[note] suitable for display
inside its parent article.
@defproc[(html$-notes-section [note-htmls string?]) non-empty-string?]
Returns the complete HTML for the @italic{Further Notes} section of an article.
@defproc[(html$-paginate-navlinks [current-page exact-positive-integer?]
[pagecount exact-positive-integer?]
[basename string?]) string?]
On the “blog”, the articles are split across multiple files: @filepath{blog-pg1.html},
@filepath{blog-pg2.html}, etc. This function provides a string containing HTML for a group of links
that can be given within each file, to link to the pages that come before/after it.
The links are enclosed within @tt{<li>} tags. It’s up to the calling site to provide the enclosing
@tt{<ul>} tag (in case any custom styling or IDs need to be applied).
