From 6a3048eee2ee0ae1db57e609e79a2d9cab773f64 Mon Sep 17 00:00:00 2001
From: Klaas Gunst <Klaas.Gunst@UGent.be>
Date: Wed, 28 Nov 2018 21:04:37 +0100
Subject: [PATCH] Changed README, added automatic detection of used backend

---
 README.md        | 14 ++++++++++++++
 plugin/papis.vim | 30 +++++++++++++++++++++++++-----
 2 files changed, 39 insertions(+), 5 deletions(-)

diff --git a/README.md b/README.md
index 90fcd55..81cabd3 100644
--- a/README.md
+++ b/README.md
@@ -20,6 +20,20 @@ Add these lines to the `.vimrc`:
 
 The `:Papis` command will open a search window for your bibliographic database. `Enter` command will insert citation for the selected record in the current buffer.
 
+The `:PapisView` command will open the pdf file of the citation currently under your cursor with the same pdf-reader used by papis. 
+This currently only works when using whoosh as backend for the papis database. Add the following to your `config` file of papis:
+
+    database-backend = whoosh
+    whoosh-schema-fields = ['ref']
+
+The second is needed to enable whoosh for searches through the ref field.
+
+
+Add the following to your `tex.vim` file for useful keyboard shortcuts:
+
+    nnoremap <buffer> <localleader>pc :Papis<cr>
+    nnoremap <buffer> <localleader>pv :PapisView<cr>
+
 ## Documentation
 
 For more information, execute `:help papis` in Vim.
diff --git a/plugin/papis.vim b/plugin/papis.vim
index 957bf27..6a3c294 100644
--- a/plugin/papis.vim
+++ b/plugin/papis.vim
@@ -48,10 +48,26 @@ function! s:handler(a)
 endfunction
 
 let g:PapisFormat = '"{doc[author]}: {doc[title]}'
-let g:PapisBackend = 'whoosh'
+let g:PapisBackend = ''
 
-command! -bang -nargs=* Papis
-      \ call fzf#run(fzf#wrap({'source': 'papis list "*" <args> --format ' . g:PapisFormat . ' @{doc[ref]}"', 'sink*': function('<sid>handler'), 'options': '--multi --expect=ctrl-y --print-query'}))
+function! s:getPapisBackend()
+  if g:PapisBackend ==# ''
+    let g:PapisBackend = systemlist('papis config database-backend')[0]
+  endif
+  return g:PapisBackend
+endfunction
+
+function! s:Papis(searchline)
+  let l:searchinp = a:searchline
+  if l:searchinp ==# ''
+    if s:getPapisBackend() ==# "whoosh"
+      let l:searchinp = '"*"'
+    endif
+  endif
+  call fzf#run(fzf#wrap({'source': 'papis list ' . l:searchinp . ' --format ' . g:PapisFormat . ' @{doc[ref]}"', 'sink*': function('s:handler'), 'options': '--multi --expect=ctrl-y --print-query'}))
+endfunction
+
+command! -bang -nargs=* Papis call s:Papis('<args>')
 
 function! s:get_citeref(cite, full_list)
   for l:ref in a:full_list
@@ -84,6 +100,11 @@ function! s:get_cite_under_cursor()
 endfunction
 
 function! s:PapisView()
+  if s:getPapisBackend() !=# "whoosh"
+    echom "PapisView only works for Papis with whoosh as database-backend at the moment"
+    return
+  endif
+
   let l:cite = s:get_cite_under_cursor()
   if l:cite ==# ""
     return
@@ -94,5 +115,4 @@ function! s:PapisView()
   call system('papis open "ref:' . l:ref . '"')
 endfunction
 
-command! -bang PapisView
-      \ call s:PapisView()
+command! -bang PapisView call s:PapisView()