Large changes.

after/ftplugin/qf.vim

@@ -52,23 +52,23 @@ endif
 " filter the location/quickfix list
 " usage:
 " :Filter foo
-" or:
-" § with the cursor on a word
 command! -buffer -nargs=* Filter call qf#FilterList(<q-args>)
-if exists("g:qf_mapping_filter")
-    execute "nnoremap <silent> <buffer> " . g:qf_mapping_filter . " :Filter <C-r><C-f><CR>"
-else
-    nnoremap <silent> <buffer> § :Filter <C-r><C-f><CR>
+
+nnoremap <silent> <Plug>QfFilter :Filter <C-r><C-f><CR>
+
+if !hasmapto('<Plug>QfFilter')
+    nmap <buffer> § <Plug>QfFilter
 endif
 
 " restore the location/quickfix list
 " usage:
 " :Restore
 command! -buffer Restore call qf#RestoreList()
-if exists("g:qf_mapping_restore")
-    execute "nnoremap <silent> <buffer> " . g:qf_mapping_restore . " :Restore<CR>"
-else
-    nnoremap <silent> <buffer> <F5> :Restore<CR>
+
+nnoremap <silent> <Plug>QfRestore :Restore<CR>
+
+if !hasmapto('<Plug>QfRestore')
+    nmap <buffer> <F5> <Plug>QfRestore
 endif
 
 " do something on each line in the location/quickfix list

plugin/qf.vim

@@ -14,40 +14,39 @@ let s:save_cpo = &cpo
 set cpo&vim
 
 " <Home> and <End> go up and down the quickfix list and wrap around
-if exists("g:qf_mapping_cprevious")
-    execute "nnoremap <silent> " . g:qf_mapping_cprevious . " :call qf#WrapCommand('up', 'c')<CR>"
-else
-    nnoremap <silent> <Home> :call qf#WrapCommand('up', 'c')<CR>
+nnoremap        <silent> <Plug>QfCprevious :call qf#WrapCommand('up', 'c')<CR>
+nnoremap        <silent> <Plug>QfCnext     :call qf#WrapCommand('down', 'c')<CR>
+
+" <C-Home> and <C-End> go up and down the location list and wrap around
+nnoremap        <silent> <Plug>QfLprevious :call qf#WrapCommand('down', 'l')<CR>
+nnoremap        <silent> <Plug>QfLnext     :call qf#WrapCommand('up', 'l')<CR>
+
+" jump to and from the location/quickfix window
+nnoremap <expr> <silent> <Plug>QfSwitch    &filetype == "qf" ? "<C-w>p" : "<C-w>b"
+
+" default mappings
+if !hasmapto('<Plug>QfCprevious')
+    nmap <Home> <Plug>QfCprevious
 endif
 
-if exists("g:qf_mapping_cnext")
-    execute "nnoremap <silent> " . g:qf_mapping_cnext . " :call qf#WrapCommand('down', 'c')<CR>"
-else
-    nnoremap <silent> <End> :call qf#WrapCommand('down', 'c')<CR>
+if !hasmapto('<Plug>QfCnext')
+    nmap <End> <Plug>QfCnext
 endif
 
-" <C-Home> and <C-End> go up and down the location list and wrap around
-if exists("g:qf_mapping_lnext")
-    execute "nnoremap <silent> " . g:qf_mapping_lnext . " :call qf#WrapCommand('down', 'l')<CR>"
-else
-    nnoremap <silent> <C-End>  :call qf#WrapCommand('down', 'l')<CR>
+if !hasmapto('<Plug>QfLprevious')
+    nmap <C-Home> <Plug>QfLprevious
 endif
 
-if exists("g:qf_mapping_lprevious")
-    execute "nnoremap <silent> " . g:qf_mapping_lprevious . " :call qf#WrapCommand('up', 'l')<CR>"
-else
-    nnoremap <silent> <C-Home> :call qf#WrapCommand('up', 'l')<CR>
+if !hasmapto('<Plug>QfLnext')
+    nmap <C-end> <Plug>QfLnext
 endif
 
-" jump to and from the quickfix window
-if exists("g:qf_mapping_switch")
-    execute 'nnoremap <expr> ' . g:qf_mapping_switch . ' &filetype == "qf" ? "<C-w>p" : "<C-w>b"'
-else
-    nnoremap <expr> ç &filetype == "qf" ? "<C-w>p" : "<C-w>b"
+if !hasmapto('<Plug>QfSwitch')
+    nmap ç <Plug>QfSwitch
 endif
 
-" automatically open the quickfix/location window after :make, :grep,
-" :lvimgrep and friends if there are valid errors/locations
+" automatically open the location/quickfix window after :make, :grep,
+" :lvimgrep and friends if there are valid locations/errors
 augroup qf
     autocmd!
     autocmd QuickFixCmdPost grep,make,grepadd,vimgrep,vimgrepadd,cscope,cfile,cgetfile,caddfile,helpgrep cwindow