improve *.tex support

 * drop dependency of external script for viewing PDFs
 * support building in included files in subdirectories.
  - create a master.tex.latexmain to indentify the main
    document
  - main latex document must be in the same directory,
    or in one of the its parent directories.

1 files changed, 31 insertions, 2 deletions

diff --git a/vim/after/ftplugin/tex.vim b/vim/after/ftplugin/tex.vim
index 91985fa..885a065 100644
--- a/vim/after/ftplugin/tex.vim
+++ b/vim/after/ftplugin/tex.vim
@@ -1,9 +1,38 @@
+function! GetMainLatexFile()
+	let p = expand('%:p:h')
+	while simplify(p) != "/"
+		let main = globpath(p, '*.latexmain')
+		if main != ''
+			return fnamemodify(main, ":p:r")
+		endif
+		let p = globpath(p, '..')
+	endwhile
+
+	" no root document found, use current one
+	return expand('%:p')
+endfunction
+
+function! BuildLatex()
+	let oldcwd = getcwd()
+	let file = GetMainLatexFile()
+	let newcwd = fnamemodify(file, ":p:h")
+	exec "lcd" . newcwd
+	exe "! rubber -d" file
+	exec "lcd" . oldcwd
+endfunction
+
+function! ShowPDF()
+	let texfile = GetMainLatexFile()
+	let pdffile = fnamemodify(texfile, ":p:r") . ".pdf"
+	exe "! evince" pdffile ">/dev/null 2>&1 &"
+endfunction
+
 " compile latex via <F6>
-nnoremap \rubber :!rubber -d %<CR>
+nnoremap \rubber :call BuildLatex()<CR>
 nmap <buffer> <F6> \rubber
 imap <buffer> <F6> <C-O>\rubber
 
 " open pdf via <F10>
-nnoremap \evince :!vim-open-pdf % >/dev/null 2>&1 &<CR><CR>
+nnoremap \evince :call ShowPDF()<CR><CR>
 nmap <buffer> <F10> \evince
 imap <buffer> <F10> <C-O>\evince