r - Rmarkdown beamer table of contents slides, plus grayed out for not current sections -

i want insert table of contents slide toward beginning , not beginning.

additionally, want each new section arrives, table of contents slide repeated, time grayed out except current section, example see image.

(this other answer not work because toc: true puts 1 table of contents @ beginning)

some answers kind of exist in latex (see here), don't know how operationalize these within markdown. more generally, have trouble integrating native beamer latex rmarkdown, if can show me how that, esp example, helpful.

beamer preamble:

output:   beamer_presentation:     fig_width: 7     fig_height: 6     fig_caption: false #    keep_tex: true #    toc: true     slide_level: 3     includes:       in_header: ~/google drive/.../.../../latexbeamertheme.r header-includes: - \atbeginsection[]{\begin{frame}\tableofcontents[currentsection]\end{frame}} 

you can solve problem via header-includes; that's how add things we'd call preamble in latex document. here's example code generates presentation think want accomplish:

--- title: "example" output: beamer_presentation header-includes: - \atbeginsection[]{\begin{frame}\tableofcontents[currentsection]\end{frame}} ---  # test section 1  ----  test  ----  test   # test section 2  ----  test  ----  test 

edit:

if want or need manually, rather using header-includes approach, can:

--- title: "example" output: beamer_presentation ---  # test section 1  ----  \tableofcontents[currentsection]  ----  test  ----  test   # test section 2  ----  \tableofcontents[currentsection]  ----  test  ----  test 

wiki