Improve support for output_directory (fixes #162)

Old code did not support absolute paths for output directory.

autoload/vimtex.vim

@@ -88,7 +88,7 @@ function! s:init_environment() " {{{1
       return s:get_main_ext(self, 'log')
     endfunction
     function data.out() dict
-      return s:get_main_out(self)
+      return s:get_main_ext(self, 'pdf')
     endfunction
 
     call add(g:vimtex#data, data)
@@ -269,49 +269,25 @@ function! s:get_main_recurse(file) " {{{1
   return 0
 endfunction
 
-function! s:get_main_ext(texdata, ext) " {{{1
-  " Create set of candidates
-  let candidates = [
-        \ a:texdata.name,
-        \ g:vimtex_latexmk_build_dir . '/' . a:texdata.name,
-        \ ]
-
-  " Search through the candidates
-  for f in map(candidates,
-        \ 'a:texdata.root . ''/'' . v:val . ''.'' . a:ext')
-    if filereadable(f)
-      return fnamemodify(f, ':p')
+function! s:get_main_ext(self, ext) " {{{1
+  " First check build dir (latexmk -output_directory option)
+  if g:vimtex_latexmk_build_dir !=# ''
+    let cand = g:vimtex_latexmk_build_dir . '/' . a:self.name . '.' . a:ext
+    if g:vimtex_latexmk_build_dir[0] !=# '/'
+      let cand = a:self.root . '/' . cand
     endif
-  endfor
-
-  " Return empty string if no entry is found
-  return ''
-endfunction
-
-function! s:get_main_out(texdata) " {{{1
-  " Create set of candidates
-  let candidates = [
-        \ a:texdata.name,
-        \ g:vimtex_latexmk_build_dir . '/' . a:texdata.name,
-        \ ]
-
-  " Check for pdf files
-  for f in map(candidates,
-        \ 'a:texdata.root . ''/'' . v:val . ''.pdf''')
-    if filereadable(f)
-      return fnamemodify(f, ':p')
+    if filereadable(cand)
+      return fnamemodify(cand, ':p')
     endif
-  endfor
+  endif
 
-  " Check for dvi files
-  for f in map(candidates,
-        \ 'a:texdata.root . ''/'' . v:val . ''.dvi''')
-    if filereadable(f)
-      return fnamemodify(f, ':p')
-    endif
-  endfor
+  " Next check for file in project root folder
+  let cand = a:self.root . '/' . a:self.name . '.' . a:ext
+  if filereadable(cand)
+    return fnamemodify(cand, ':p')
+  endif
 
-  " Return empty string if no entry is found
+  " Finally return empty string if no entry is found
   return ''
 endfunction
 

autoload/vimtex/latexmk.vim

@@ -6,7 +6,7 @@
 
 function! vimtex#latexmk#init(initialized) " {{{1
   call vimtex#util#set_default('g:vimtex_latexmk_enabled', 1)
-  call vimtex#util#set_default('g:vimtex_latexmk_build_dir', '.')
+  call vimtex#util#set_default('g:vimtex_latexmk_build_dir', '')
   if !g:vimtex_latexmk_enabled | return | endif
   if s:system_incompatible() | return | endif
 
@@ -109,7 +109,7 @@ function! vimtex#latexmk#clean(full) " {{{1
     let cmd = 'cd ' . shellescape(data.root) . '; '
   endif
   let cmd .= 'latexmk'
-  if g:vimtex_latexmk_build_dir !=# '.'
+  if g:vimtex_latexmk_build_dir !=# ''
     let cmd .= ' -outdir=' . g:vimtex_latexmk_build_dir
   endif
   let cmd .= a:full ? ' -C ' : ' -c '
@@ -388,7 +388,9 @@ function! s:latexmk_build_cmd(data) " {{{1
 
   let cmd .= ' ' . g:vimtex_latexmk_options
   let cmd .= ' -e ' . shellescape('$pdflatex =~ s/ / -file-line-error /')
-  let cmd .= ' -outdir=' . g:vimtex_latexmk_build_dir
+  if g:vimtex_latexmk_build_dir !=# ''
+    let cmd .= ' -outdir=' . g:vimtex_latexmk_build_dir
+  endif
 
   if g:vimtex_latexmk_continuous
     let cmd .= ' -pvc'

doc/vimtex.txt

@@ -446,10 +446,12 @@ Options~
 
 *g:vimtex_latexmk_build_dir*
   This option sets the compilation build directory.  It corresponds to the
-  `-output-directory` option in `latexmk`.  Note that this option only works
-  with `latexmk` version 4.27 and later.
+  `-output-directory` option in `latexmk`.  If the path is a relative path,
+  then it will be considered relative to the main project file.
+  
+  Note that this option only works with `latexmk` version 4.27 and later.
 
-  Default value: '.'
+  Default value: ''
 
 *g:vimtex_latexmk_callback*
   If enabled, this option tells `latexmk` to run |vimtex#latexmk#callback| after