Enable searching home, project root, and file's directory for latexmkrc file

[todmorrison]

This change enables searching home directory, cwd (typically the project root), and then file's directory for a ".latexmkrc" file. It does this in reverse of the stated order, so that the "most local" 'out_dir' configuration stands.

[PMassicotte]

Suggested change

	for _, chkdir in pairs(chkdirs) do
	if vim.fn.glob(chkdir .. "/.latexmkrc") ~= "" then
	local ltxmk = vim.fn.readfile(vim.fn.expand(chkdir .. "/.latexmkrc"))
	for _, line in ipairs(ltxmk) do
	if
	line:match('out_dir%s*=%s*"(.*)"')
	or line:match("out_dir%s*=%s*'(.*)'")
	then
	vim.b.rplugin_pdfdir = line:match('out_dir%s*=%s*"(.*)"')
	or line:match("out_dir%s*=%s*'(.*)'")
	end
	end
	end
	for _, chkdir in ipairs(chkdirs) do
	local rcfile = vim.fn.expand(chkdir .. "/.latexmkrc")
	if vim.fn.glob(rcfile) ~= "" then
	for _, line in ipairs(vim.fn.readfile(rcfile)) do
	vim.b.rplugin_pdfdir = line:match('out_dir%s*=%s*"(.*)"')
	or line:match("out_dir%s*=%s*'(.*)'")
	or vim.b.rplugin_pdfdir
	end
	end
	end

[PMassicotte]

Thank you for your contribution.

Two small things:

1. I would use ipairs
2. Collapsed the inner if into a single assignment (the or gvim.b.rplugin_pdfdirg at the end preserves the current value when no match is found)

[todmorrison]

I agree, ipairs does exactly what I intended (Thank you!) and the collapsed if is much better. I had simply left the existing logic thinking to minimize changes, but your version is so much cleaner.

Changes done. Thanks for the feedback/suggestions.

[PMassicotte]

Note: the CI style errors are expected.

[PMassicotte]

All good on my side :)

[jalvesaq]

All good on my side :)

Thank you, @PMassicotte and @todmorrison! I'm no longer using LaTeX or Rnoweb to try the pull request carefully. Merging it now...