Provide :Last

Closes #7.

doc/foreplay.txt

@@ -161,6 +161,12 @@ cqc                     Bring up a |command-line-window| for code to
 cq{motion}              Bring up a |command-line-window| with text indicated
                         by {motion} prepopulated.
 
+                                                *foreplay-:Last*
+:Last                   Open the result of the last evaluation in the preview
+                        window.  Use :2Last to get the next-to-last result,
+                        and so on.  Once the window is open, cycle to older
+                        and newer entries with |:lprevious| and |:lnext|.
+
 And insert mode:
 
                                                 *foreplay-i_CTRL-R_(*

plugin/foreplay.vim

@@ -316,7 +316,13 @@ endfunction
 
 function! s:client() abort
   silent doautocmd User ForeplayPreConnect
-  let buf = exists('s:input') ? s:input : '%'
+  if exists('s:input')
+    let buf = s:input
+  elseif has_key(s:qffiles, expand('%:p'))
+    let buf = s:qffiles[expand('%:p')].buffer
+  else
+    let buf = '%'
+  endif
   let root = simplify(fnamemodify(bufname(buf), ':p:s?[\/]$??'))
   let previous = ""
   while root !=# previous
@@ -337,7 +343,13 @@ function! foreplay#local_client(...)
   if !a:0
     silent doautocmd User ForeplayPreConnect
   endif
-  let buf = exists('s:input') ? s:input : '%'
+  if exists('s:input')
+    let buf = s:input
+  elseif has_key(s:qffiles, expand('%:p'))
+    let buf = s:qffiles[expand('%:p')].buffer
+  else
+    let buf = '%'
+  endif
   for repl in s:repls
     if repl.includes_file(fnamemodify(bufname(buf), ':p'))
       return repl
@@ -424,13 +436,66 @@ function! s:eval(expr, ...) abort
   return client.eval(a:expr, options)
 endfunction
 
+function! s:temp_response(response) abort
+  let output = []
+  if get(a:response, 'out', '') !=# ''
+    let output = map(split(a:response.out, "\n"), '";".v:val')
+  endif
+  if has_key(a:response, 'value')
+    let output += [a:response.value]
+  endif
+  let temp = tempname().'.clj'
+  call writefile(output, temp)
+  return temp
+endfunction
+
+if !exists('s:history')
+  let s:history = []
+endif
+
+if !exists('s:qffiles')
+  let s:qffiles = {}
+endif
+
+function! s:qfentry(entry) abort
+  if !has_key(a:entry, 'tempfile')
+    let a:entry.tempfile = s:temp_response(a:entry.response)
+  endif
+  let s:qffiles[a:entry.tempfile] = a:entry
+  return {'filename': a:entry.tempfile, 'text': a:entry.code}
+endfunction
+
+function! s:qfhistory() abort
+  let list = []
+  for entry in reverse(s:history)
+    if !has_key(entry, 'tempfile')
+      let entry.tempfile = s:temp_response(entry.response)
+    endif
+    call extend(list, [s:qfentry(entry)])
+  endfor
+  return list
+endfunction
+
 function! foreplay#eval(expr) abort
   let response = s:eval(a:expr, {'session': 1})
 
+  if !empty(get(response, 'value', ''))
+    call insert(s:history, {'buffer': bufnr(''), 'code': a:expr, 'ns': foreplay#ns(), 'response': response})
+  endif
+  if len(s:history) > &history
+    call remove(s:history, &history, -1)
+  endif
+
   if !empty(get(response, 'stacktrace', []))
-    call setloclist(0, foreplay#quickfix_for(response.stacktrace))
-    lopen
-    wincmd p
+    let nr = 0
+    if has_key(s:qffiles, expand('%:p'))
+      let nr = winbufnr(s:qffiles[expand('%:p')].buffer)
+    endif
+    if nr != -1
+      call setloclist(nr, foreplay#quickfix_for(response.stacktrace))
+      lopen
+      wincmd p
+    endif
   endif
 
   call s:output_response(response)
@@ -668,8 +733,30 @@ nnoremap          <Plug>ForeplayPrompt :exe <SID>inputeval()<CR>
 
 noremap!          <Plug>ForeplayRecall <C-R>=<SID>recall()<CR>
 
+function! s:Last(bang, count) abort
+  if len(s:history) < a:count
+    return 'echoerr "History entry not found"'
+  endif
+  let history = s:qfhistory()
+  let last = s:qfhistory()[a:count-1]
+  execute 'pedit '.last.filename
+  if !&previewwindow
+    let nr = winnr()
+    wincmd p
+    wincmd P
+  endif
+  call setloclist(0, history)
+  silent exe 'llast '.(len(history)-a:count+1)
+  if exists('nr') && a:bang
+    wincmd p
+    exe nr.'wincmd w'
+  endif
+  return ''
+endfunction
+
 function! s:setup_eval() abort
   command! -buffer -bang -range=0 -nargs=? -complete=customlist,foreplay#eval_complete Eval :exe s:Eval(<bang>0, <line1>, <line2>, <count>, <q-args>)
+  command! -buffer -bang -bar -count=1 Last exe s:Last(<bang>0, <count>)
 
   nmap <buffer> cp <Plug>ForeplayPrint
   nmap <buffer> cpp <Plug>ForeplayPrintab
@@ -686,6 +773,11 @@ function! s:setup_eval() abort
   map! <buffer> <C-R>( <Plug>ForeplayRecall
 endfunction
 
+function! s:setup_historical()
+  set readonly nomodifiable
+  nnoremap <buffer><silent>q :bdelete<CR>
+endfunction
+
 function! s:cmdwinenter()
   setlocal filetype=clojure
 endfunction
@@ -697,6 +789,9 @@ endfunction
 augroup foreplay_eval
   autocmd!
   autocmd FileType clojure call s:setup_eval()
+  autocmd BufReadPost * if has_key(s:qffiles, expand('<afile>:p')) |
+        \   call s:setup_historical() |
+        \ endif
   autocmd CmdWinEnter @ if exists('s:input') | call s:cmdwinenter() | endif
   autocmd CmdWinLeave @ if exists('s:input') | call s:cmdwinleave() | endif
 augroup END
@@ -891,6 +986,9 @@ function! foreplay#ns() abort
   if ns !=# ''
     return ns
   endif
+  if has_key(s:qffiles, expand('%:p'))
+    return s:qffiles[expand('%:p')].ns
+  endif
   let path = s:buffer_path()
   return s:tons(path ==# '' ? 'user' : path)
 endfunction