PlugDiff: Display commit info in preview window

plug.vim

@@ -57,7 +57,7 @@ set cpo&vim
 
 let s:plug_source = 'https://raw.github.com/junegunn/vim-plug/master/plug.vim'
 let s:plug_file = 'Plugfile'
-let s:plug_win = 0
+let s:plug_buf = -1
 let s:is_win = has('win32') || has('win64')
 let s:me = expand('<sfile>:p')
 
@@ -262,7 +262,7 @@ function! s:syntax()
   syn match plugDash /^-/
   syn match plugName /\(^- \)\@<=[^:]*/
   syn match plugCommit /^  [0-9a-z]\{7} .*/ contains=plugRelDate,plugSha
-  syn match plugSha /^  [0-9a-z]\{7}/ contained
+  syn match plugSha /\(^  \)\@<=[0-9a-z]\{7}/ contained
   syn match plugRelDate /([^)]*)$/ contained
   syn match plugError /^x.*/
   syn keyword Function PlugInstall PlugStatus PlugUpdate PlugClean
@@ -288,18 +288,27 @@ function! s:lastline(msg)
 endfunction
 
 function! s:prepare()
-  execute s:plug_win . 'wincmd w'
-  if exists('b:plug')
+  if bufexists(s:plug_buf)
+    let winnr = bufwinnr(s:plug_buf)
+    if winnr < 0
+      vertical topleft new
+      execute 'buffer ' . s:plug_buf
+    else
+      execute winnr . 'wincmd w'
+    endif
     %d
   else
     vertical topleft new
-    nnoremap <silent> <buffer> q :q<cr>
-    nnoremap <silent> <buffer> D :PlugDiff<cr>
-    nnoremap <silent> <buffer> S :PlugStatus<cr>
-    let b:plug = 1
-    let s:plug_win = winnr()
+    nnoremap <silent> <buffer> q  :if b:plug_preview==1<bar>pc<bar>endif<bar>q<cr>
+    nnoremap <silent> <buffer> D  :PlugDiff<cr>
+    nnoremap <silent> <buffer> S  :PlugStatus<cr>
+    nnoremap <silent> <buffer> ]] :silent! call <SID>section('')<cr>
+    nnoremap <silent> <buffer> [[ :silent! call <SID>section('b')<cr>
+    let b:plug_preview = -1
+    let s:plug_buf = winbufnr(0)
     call s:assign_name()
   endif
+  silent! unmap <buffer> <cr>
   setlocal buftype=nofile bufhidden=wipe nobuflisted noswapfile nowrap cursorline
   setf vim-plug
   call s:syntax()
@@ -324,6 +333,8 @@ function! s:finish()
   call s:syntax()
   call setline(4, getline(4) . 'Done!')
   normal! gg
+  redraw
+  echo "Press 'D' to see the updated changes."
 endfunction
 
 function! s:update_impl(pull, args)
@@ -770,9 +781,54 @@ function! s:status()
   normal! gg
 endfunction
 
+function! s:is_preview_window_open()
+  silent! wincmd P
+  if &previewwindow
+    wincmd p
+    return 1
+  endif
+  return 0
+endfunction
+
+function! s:preview_commit()
+  if b:plug_preview < 0
+    let b:plug_preview = !s:is_preview_window_open()
+  endif
+
+  let sha = matchstr(getline('.'), '\(^  \)\@<=[0-9a-z]\{7}')
+  if !empty(sha)
+    let lnum = line('.')
+    while lnum > 1
+      let lnum -= 1
+      let line = getline(lnum)
+      let name = matchstr(line, '\(^- \)\@<=[^:]\+')
+      if !empty(name)
+        let dir = g:plugs[name].dir
+        if isdirectory(dir)
+          execute 'cd '.s:esc(dir)
+          execute 'pedit '.sha
+          wincmd P
+          setlocal filetype=git buftype=nofile nobuflisted
+          execute 'silent read !git show '.sha
+          normal! ggdd
+          wincmd p
+          cd -
+        endif
+        break
+      endif
+    endwhile
+  endif
+endfunction
+
+function! s:section(flags)
+  call search('\(^- \)\@<=.', a:flags)
+endfunction
+
 function! s:diff()
   call s:prepare()
   call append(0, 'Collecting updated changes ...')
+  normal! gg
+  redraw
 
   let cnt = 0
   for [k, v] in items(g:plugs)
@@ -794,6 +850,7 @@ function! s:diff()
   endfor
 
   call setline(1, cnt == 0 ? 'No updates.' : 'Last update:')
+  nnoremap <silent> <buffer> <cr> :silent! call <SID>preview_commit()<cr>
   normal! gg
 endfunction
 

test/workflow.vader

@@ -13,6 +13,7 @@ Execute (Initialize test environment):
 
   set t_Co=256
   colo default
+  pclose
 
   let g:vimrc_reloaded = 0
   let vimrc    = tempname()
@@ -215,10 +216,84 @@ Execute (PlugUpdate to install both again):
   Assert !empty(globpath(&rtp, 'autoload/emoji.vim')), 'vim-emoji should be found'
   q
 
-Execute (PlugUpdate only to find out plugins are up-to-date):
+Execute (PlugUpdate only to find out plugins are up-to-date, D key to check):
   PlugUpdate
   AssertEqual 2, len(filter(getline(1, line('$')), 'v:val =~ "Already up-to-date"'))
   AssertEqual 3, g:vimrc_reloaded
+  normal D
+  AssertEqual 'No updates.', getline(1)
+  q
+
+Execute (PlugDiff - 'No updates.'):
+  PlugDiff
+  AssertEqual 'No updates.', getline(1)
+  q
+
+Execute (Rollback recent updates, PlugUpdate, then PlugDiff):
+  for repo in ['seoul256.vim', 'vim-emoji']
+    call system(printf('cd %s/%s && git reset HEAD^^ --hard', g:plug_home, repo))
+  endfor
+  PlugUpdate
+
+  " Now we have updates
+  normal D
+  AssertEqual 'Last update:', getline(1)
+
+  " Preview commit
+  silent! wincmd P
+  AssertEqual 0, &previewwindow
+
+  " ]] motion
+  execute 'normal ]]'
+  let lnum = line('.')
+  AssertEqual 3, col('.')
+
+  " Open commit preview
+  execute "normal j\<cr>"
+  wincmd P
+  AssertEqual 1, &previewwindow
+  AssertEqual 'git', &filetype
+
+  " Back to plug window
+  wincmd p
+
+  " ]] motion
+  execute 'normal $]]'
+  AssertEqual lnum + 4, line('.')
+  AssertEqual 3, col('.')
+
+  " [[ motion
+  execute 'normal 0[['
+  AssertEqual lnum, line('.')
+  AssertEqual 3, col('.')
+
+  " q will close preview window as well
+  normal q
+
+  " We no longer have preview window
+  silent! wincmd P
+  AssertEqual 0, &previewwindow
+
+  " q should not close preview window if it's already open
+  pedit
+  PlugDiff
+  execute "normal ]]j\<cr>"
+  normal q
+
+  silent! wincmd P
+  AssertEqual 1, &previewwindow
+  pclose
+
+Execute (Plug window in a new tab):
+  PlugDiff
+  tab new new-tab
+  set buftype=nofile
+  PlugUpdate
+  normal D
+  AssertEqual 'No updates.', getline(1)
+  q
+  AssertEqual 'new-tab', expand('%')
+  q
   q
 
 Execute (Cleanup):
@@ -227,7 +302,7 @@ Execute (Cleanup):
   unlet g:plugs
   unlet g:plug_home
   unlet g:vimrc_reloaded
-  unlet temp_plugged vader plug basertp save_rtp
+  unlet temp_plugged vader plug basertp save_rtp repo lnum
 
   Restore
   source $MYVIMRC