Improve PlugStatus

- Display load status
- Load plugin with 'L' key

(This commit also allows not loading a plugin with `'for': []`. It used
to load ftdetect files.)

plug.vim

@@ -80,6 +80,7 @@ let s:TYPE = {
 \   'dict':    type({}),
 \   'funcref': type(function('call'))
 \ }
+let s:loaded = get(s:, 'loaded', {})
 
 function! plug#begin(...)
   if a:0 > 0
@@ -148,9 +149,8 @@ function! plug#end()
   " need to loop through the plugins in reverse
   for name in reverse(copy(g:plugs_order))
     let plug = g:plugs[name]
-    if !has_key(plug, 'on') && !has_key(plug, 'for')
-      let rtp = s:rtp(plug)
-      call s:add_rtp(rtp)
+    if get(s:loaded, plug.dir, 0) || !has_key(plug, 'on') && !has_key(plug, 'for')
+      let rtp = s:add_rtp(plug)
       if reload
         call s:source(rtp, 'plugin/**/*.vim', 'after/plugin/**/*.vim')
       endif
@@ -177,8 +177,11 @@ function! plug#end()
     endif
 
     if has_key(plug, 'for')
-      call s:source(s:rtp(plug), 'ftdetect/**/*.vim', 'after/ftdetect/**/*.vim')
-      for key in s:to_a(plug.for)
+      let types = s:to_a(plug.for)
+      if !empty(types)
+        call s:source(s:rtp(plug), 'ftdetect/**/*.vim', 'after/ftdetect/**/*.vim')
+      endif
+      for key in types
         if !has_key(lod, key)
           let lod[key] = []
         endif
@@ -247,12 +250,15 @@ function! s:esc(path)
   return substitute(a:path, ' ', '\\ ', 'g')
 endfunction
 
-function! s:add_rtp(rtp)
-  execute 'set rtp^='.s:esc(a:rtp)
-  let after = globpath(a:rtp, 'after')
+function! s:add_rtp(plug)
+  let rtp = s:rtp(a:plug)
+  execute 'set rtp^='.s:esc(rtp)
+  let after = globpath(rtp, 'after')
   if isdirectory(after)
     execute 'set rtp+='.s:esc(after)
   endif
+  let s:loaded[a:plug.dir] = 1
+  return rtp
 endfunction
 
 function! s:reorg_rtp()
@@ -287,8 +293,7 @@ function! plug#load(...)
 endfunction
 
 function! s:lod(plug, types)
-  let rtp = s:rtp(a:plug)
-  call s:add_rtp(rtp)
+  let rtp = s:add_rtp(a:plug)
   for dir in a:types
     call s:source(rtp, dir.'/**/*.vim')
   endfor
@@ -339,6 +344,7 @@ function! s:add(repo, ...)
                     \ a:0 == 1 ? s:parse_options(a:1) : s:base_spec)
     let g:plugs[name] = spec
     let g:plugs_order += [name]
+    let s:loaded[spec.dir] = 0
   catch
     return s:err(v:exception)
   endtry
@@ -419,6 +425,7 @@ function! s:syntax()
   syn match plugCommit /^  [0-9a-z]\{7} .*/ contains=plugRelDate,plugSha
   syn match plugSha /\(^  \)\@<=[0-9a-z]\{7}/ contained
   syn match plugRelDate /([^)]*)$/ contained
+  syn match plugNotLoaded /(not loaded)$/
   syn match plugError /^x.*/
   syn keyword Function PlugInstall PlugStatus PlugUpdate PlugClean
   hi def link plug1       Title
@@ -439,6 +446,8 @@ function! s:syntax()
   hi def link plugError   Error
   hi def link plugRelDate Comment
   hi def link plugSha     Identifier
+
+  hi def link plugNotLoaded Comment
 endfunction
 
 function! s:lpad(str, len)
@@ -473,6 +482,7 @@ function! s:prepare()
     call s:assign_name()
   endif
   silent! unmap <buffer> <cr>
+  silent! unmap <buffer> L
   setlocal buftype=nofile bufhidden=wipe nobuflisted noswapfile nowrap cursorline
   setf vim-plug
   call s:syntax()
@@ -1072,6 +1082,7 @@ function! s:status()
   call append(1, '')
 
   let ecnt = 0
+  let unloaded = 0
   let [cnt, total] = [0, len(g:plugs)]
   for [name, spec] in items(g:plugs)
     if has_key(spec, 'uri')
@@ -1089,6 +1100,11 @@ function! s:status()
     endif
     let cnt += 1
     let ecnt += !valid
+    " `s:loaded` entry can be missing if PlugUpgraded
+    if valid && get(s:loaded, spec.dir, -1) == 0
+      let unloaded = 1
+      let msg .= ' (not loaded)'
+    endif
     call s:progress_bar(2, repeat('=', cnt), total)
     call append(3, s:format_message(valid, name, msg))
     normal! 2G
@@ -1096,6 +1112,21 @@ function! s:status()
   endfor
   call setline(1, 'Finished. '.ecnt.' error(s).')
   normal! gg
+  if unloaded
+    echo "Press 'L' on each line to load plugin"
+    nnoremap <silent> <buffer> L :call <SID>status_load(line('.'))<cr>
+    xnoremap <silent> <buffer> L :call <SID>status_load(line('.'))<cr>
+  end
+endfunction
+
+function! s:status_load(lnum)
+  let line = getline(a:lnum)
+  let matches = matchlist(line, '^- \([^:]*\):.*(not loaded)$')
+  if !empty(matches)
+    let name = matches[1]
+    call plug#load(name)
+    call setline(a:lnum, substitute(line, ' (not loaded)$', '', ''))
+  endif
 endfunction
 
 function! s:is_preview_window_open()

test/run

@@ -21,20 +21,24 @@ make_dirs() {
   for d in *; do
     cat > $d/xxx.vim << EOF
     " echom expand('<sfile>')
-    let g:xxx = get(g:, 'xxx', [])
-    call add(g:xxx, '${1:4}/$d')
+    let g:$2 = get(g:, '$2', [])
+    call add(g:$2, '${1:4}/$d')
 EOF
   done
   cd - > /dev/null
 }
 
-make_dirs xxx/
-make_dirs xxx/after
+make_dirs xxx/ xxx
+make_dirs xxx/after xxx
 mkdir xxx/doc
 cat > xxx/doc/xxx.txt << DOC
 hello *xxx*
 DOC
 
+make_dirs yyy/ yyy
+make_dirs z1/ z1
+make_dirs z2/ z2
+
 cat > /tmp/mini-vimrc << VIMRC
 set rtp+=vader.vim
 set shell=/bin/bash

test/workflow.vader

@@ -761,6 +761,8 @@ Execute (Filetype-based on-demand loading):
   setf xxx
   AssertEqual ['/ftdetect', 'after/ftdetect', '/plugin', 'after/plugin', '/ftplugin', 'after/ftplugin', '/indent', 'after/indent', '/syntax', 'after/syntax'], g:xxx
 
+Before:
+
 **********************************************************************
 ~ plug#helptags()
 **********************************************************************
@@ -772,7 +774,7 @@ Execute (plug#helptags):
   Assert filereadable(expand('$PWD/xxx/doc/tags'))
 
 **********************************************************************
-~ plug#load()
+~ Manual loading
 **********************************************************************
 
 Execute (plug#load - invalid arguments):
@@ -783,13 +785,19 @@ Execute (plug#load - invalid arguments):
   AssertEqual 0, plug#load('xxx', 'non-existent-plugin')
   AssertEqual 0, plug#load('non-existent-plugin', 'xxx')
 
-Execute (plug#load):
+Execute (on: []):
   call plug#begin()
   Plug 'junegunn/rust.vim', { 'on': [] }
   call plug#end()
   PlugInstall
   q
 
+Execute (PlugStatus reports (not loaded)):
+  PlugStatus
+  AssertExpect 'not loaded', 1
+  q
+
+Execute (plug#load to load it):
   setf xxx
   f test.rs
   Log &filetype
@@ -797,7 +805,41 @@ Execute (plug#load):
   AssertEqual 1, plug#load('rust.vim')
   AssertEqual 'rust', &filetype
 
-Before:
+Execute (PlugStatus should not contain (not loaded)):
+  PlugStatus
+  AssertExpect 'not loaded', 0
+  q
+
+Execute (Load plugin from PlugStatus screen with L key in normal mode):
+  call plug#begin()
+  Plug '$PWD/yyy', { 'on': [] }
+  call plug#end()
+
+  PlugStatus
+  AssertExpect 'not loaded', 1
+  Assert !exists('g:yyy'), 'yyy not loaded'
+  /not loaded
+  normal L
+  AssertExpect 'not loaded', 0
+  Assert exists('g:yyy'), 'yyy loaded'
+  q
+
+Execute (Load plugin from PlugStatus screen with L key in visual mode):
+  call plug#begin()
+  Plug '$PWD/z1', { 'on':  [] }
+  Plug '$PWD/z2', { 'for': [] }
+  call plug#end()
+
+  PlugStatus
+  AssertExpect 'not loaded', 2
+  Assert !exists('g:z1'), 'z1 not loaded'
+  Assert !exists('g:z2'), 'z2 not loaded'
+  normal ggVGL
+  AssertExpect 'not loaded', 0
+  Assert exists('g:z1'), 'z1 loaded'
+  Assert exists('g:z2'), 'z2 loaded'
+  q
+
 Execute (Cleanup):
   silent! call system('rm -rf '.temp_plugged)
   silent! call rename('fzf', 'fzf-staged')