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diff --git a/ftplugin/latex-box/findmain.vim b/ftplugin/latex-box/findmain.vim
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+" Tex_GetMainFileName: gets the name of the main file being compiled. {{{
+" Description:  returns the full path name of the main file.
+"               This function checks for the existence of a .latexmain file
+"               which might point to the location of a "main" latex file.
+"               If .latexmain exists, then return the full path name of the
+"               file being pointed to by it.
+"
+"               Otherwise, return the full path name of the current buffer.
+"
+"               You can supply an optional "modifier" argument to the
+"               function, which will optionally modify the file name before
+"               returning.
+"               NOTE: From version 1.6 onwards, this function always trims
+"               away the .latexmain part of the file name before applying the
+"               modifier argument.
+function! Tex_GetMainFileName(...)
+	if a:0 > 0
+		let modifier = a:1
+	else
+		let modifier = ':p'
+	endif
+
+	let s:origdir = fnameescape(getcwd())
+
+	let dirmodifier = '%:p:h'
+	let dirLast = fnameescape(expand(dirmodifier))
+	exe 'cd '.dirLast
+
+	" move up the directory tree until we find a .latexmain file.
+	" TODO: Should we be doing this recursion by default, or should there be a
+	"       setting?
+	while glob('*.latexmain') == ''
+		let dirmodifier = dirmodifier.':h'
+		let dirNew = fnameescape(expand(dirmodifier))
+		" break from the loop if we cannot go up any further.
+		if dirNew == dirLast
+			break
+		endif
+		let dirLast = dirNew
+		exe 'cd '.dirLast
+	endwhile
+
+	let lheadfile = glob('*.latexmain')
+	if lheadfile != ''
+		" Remove the trailing .latexmain part of the filename... We never want
+		" that.
+		let lheadfile = fnamemodify(substitute(lheadfile, '\.latexmain$', '', ''), modifier)
+	else
+		" If we cannot find any main file, just modify the filename of the
+		" current buffer.
+		let lheadfile = expand('%'.modifier)
+	endif
+
+    if lheadfile !~ '\.tex$'
+        let lheadfile .= '.tex'
+    endif
+    exe 'cd '.s:origdir
+
+	" NOTE: The caller of this function needs to escape the file name with
+	"       fnameescape() . The reason its not done here is that escaping is not
+	"       safe if this file is to be used as part of an external command on
+	"       certain platforms.
+	return lheadfile
+endfunction