Build a page for aggregating common elements

Build a page for aggregating common elements

Usage

build_aio(pkg, pages = NULL, quiet = FALSE)

build_images(pkg, pages = NULL, quiet = FALSE)

build_instructor_notes(pkg, pages = NULL, built = NULL, quiet)

build_keypoints(pkg, pages = NULL, quiet = FALSE)

build_agg_page(
  pkg,
  pages,
  title = NULL,
  slug = NULL,
  aggregate = "section",
  append = "self::node()",
  prefix = FALSE,
  quiet = FALSE
)

Arguments

pkg

an object created via pkgdown::as_pkgdown() of a lesson.

pages

output from the function read_all_html(): a nested list of xml_document objects representing episodes in the lesson

quiet

if TRUE, no messages will be emitted. If FALSE, pkgdown will report creation of the temporary file.

built

a vector of markdown documents that have recently been rebuilt (for future use)

title

the new page title

slug

the slug for the page (e.g. "aio" will become "aio.html")

aggregate

a selector for the lesson content you want to aggregate. The default is "section", which will aggregate all sections, but nothing outside of the sections. To grab everything in the page, use "*"

append

a selector for the section of the page where the aggregate data should be placed. This defaults to "self::node()", which indicates that the entire page should be appended.

prefix

flag to add a prefix for the aggregated sections. Defaults to FALSE.

Value

NULL, invisibly. This is called for its side-effect

Details

Building an aggregate page is very much akin to copy/paste—you take the same elements across several pages and paste them into one large page. We can do this programmatically by using XPath to extract nodes from pages and add them into the document.

To customise the page, we need a few things:

1. a title

2. a slug

3. a method to prepare and insert the extracted content (e.g. make_aio_section())

Note

This function assumes that you have already built all the episodes of your lesson.

Examples

if (FALSE) {
  # build_aio() assumes that your lesson has been built and takes in a 
  # pkgdown object, which can be created from the `site/` folder in your
  # lesson.
  lsn <- "/path/to/my/lesson"
  pkg <- pkgdown::as_pkgdown(fs::path(lsn, "site"))

  htmls <- read_all_html(pkg$dst_path)
  build_aio(pkg, htmls, quiet = FALSE)
  build_keypoints(pkg, htmls, quiet = FALSE)
}