add the meta variable 'plain-title' for HTML, so the <title> won't co…

…ntain HTML tags

DESCRIPTION

@@ -1,7 +1,7 @@
 Package: litedown
 Type: Package
 Title: A Lightweight Version of R Markdown
-Version: 0.1.5
+Version: 0.1.6
 Authors@R: c(
    person("Yihui", "Xie", role = c("aut", "cre"), email = "[email protected]", comment = c(ORCID = "0000-0003-0645-5666")),
    person()

NEWS.md

@@ -2,6 +2,8 @@
 
 - A data frame (or matrix/tibble) wrapped in `I()` is fully printed to a table now by default. Without `I()`, data objects are truncated to 10 rows by default when printing to tables.
 
+- Added the meta variable `plain-title` for HTML output, which is the plain version of the document title (i.e., without HTML tags), and used in the `<title>` tag.
+
 - The implicit latest version of jsdelivr resources will be resolved to an explicit version, e.g., `https://cdn.jsdelivr.net/npm/@xiee/utils/css/default.css` will be resolved to `https://cdn.jsdelivr.net/npm/@xiee/[email protected]/css/default.css`, where `X.Y.Z` is the current latest version. This will make sure the HTML output containing jsdelivr resources is stable.
 
 # CHANGES IN litedown VERSION 0.1

R/mark.R

@@ -373,6 +373,7 @@ build_output = function(format, options, template, meta) {
       if (!name %in% names(meta)) meta[[name]] <<- value
     }
     set_meta('css', 'default')
+    set_meta('plain-title', str_trim(commonmark::markdown_text(meta[['title']])))
     meta = set_math(meta, options, b)
     meta = set_highlight(meta, options, b)
     # if the class .line-numbers is present, add js/css for line numbers

inst/resources/litedown.html

@@ -5,7 +5,7 @@
 <meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=yes">
 <meta name="generator" content="$generator$">
 
-<title>$title$</title>
+<title>$plain-title$</title>
 
 $css$