Setting HTML meta elements with knitr

2019-04-24 11:53发布

站内问答 / 后端开发
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I'm generating HTML reports using knitr, and I'd like to include author and generation date meta tags.

My Rhtml page looks something like this.

<html>
<head>
  <meta name="author" content="<!--rinline Sys.getenv('USERNAME') -->">
  <meta name="date" content="<!--rinline as.character(Sys.time()) -->"> 
</head>
<body>
</body>
</html>

Unfortunately, after I knit("test.Rhtml"), the HTML that knitr generates is

  <meta name="author" content="<code class="knitr inline">RCotton</code>">
  <meta name="date" content="<code class="knitr inline">2013-01-02 14:38:16</code>">

which isn't valid HTML. What I'd really like to generate is something like

  <meta name="author" content="RCotton">
  <meta name="date" content="2013-01-02 14:38:16">

Can I generate R code that doesn't get a code tag wrapping it? Or is there another way to specify tag attributes (like these content attributes)?

So far my least-worst plan is to manually fix the content with readLines/str_replace/writeLines, but this seems rather kludgy.

2条回答
不美不萌又怎样
2楼-- · 2019-04-24 12:06

Another (undocumented) approach is to add I() around your inline code to print the characters as is without the <code> tag, e.g.

<html>
<head>
  <meta name="author" content="<!--rinline I(Sys.getenv('USERNAME')) -->">
  <meta name="date" content="<!--rinline I(as.character(Sys.time())) -->"> 
</head>
<body>
</body>
</html>
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倾城　Initia
3楼-- · 2019-04-24 12:20

Not really nice, but seems to work without adding a hook:

<head>
<!--begin.rcode results='asis', echo=FALSE
cat('
  <meta name="author" content="', Sys.getenv('USERNAME'), '"> 
  <meta name="date" content="', as.character(Sys.time()),'-->"> 
',sep="")
end.rcode-->

</head>
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