fix justinmk#101: 'Cursor' highlight missing ctermbg

autoload/sneak/hl.vim

@@ -5,19 +5,18 @@ func! sneak#hl#removehl() "remove highlighting
 endf
 
 " gets the 'links to' value of the specified highlight group, if any.
-"   https://github.com/osyo-manga/vim-over/blob/d8819448fc4074342abd5cb6cb2f0fff47b7aa22/autoload/over/command_line.vim#L225
 func! sneak#hl#links_to(hlgroup)
   redir => hl | exec 'silent highlight '.a:hlgroup | redir END
   let s = substitute(matchstr(hl, 'links to \zs.*'), '\s', '', 'g')
   return empty(s) ? 'NONE' : s
 endf
 
-func! sneak#hl#is_valid(hlgroup) "avoid junk like 'Cursor xxx cleared'
+func! sneak#hl#get(hlgroup) "gets the definition of the specified highlight
   if !hlexists(a:hlgroup)
-    return 0
+    return ""
   endif
   redir => hl | exec 'silent highlight '.a:hlgroup | redir END
-  return !empty(matchstr(hl, '\%(.*xxx\)\?\%(.*cleared\)\?\s*\zs.*'))
+  return matchstr(hl, '\%(.*xxx\)\?\%(.*cleared\)\?\s*\zs.*')
 endf
 
 if 0 == hlID("SneakPluginTarget")
@@ -44,7 +43,7 @@ if 0 == hlID("SneakStreakStatusLine")
   highlight link SneakStreakStatusLine SneakStreakTarget
 endif
 
-if sneak#hl#is_valid('Cursor')
+if has('gui_running') || -1 != match(sneak#hl#get('Cursor'), 'ctermbg')
   highlight link SneakStreakCursor Cursor
 else
   highlight link SneakStreakCursor SneakPluginScope

tests/test.vader

@@ -57,8 +57,12 @@ Execute (hl#links_to() returns NONE if not linked):
   hi! link Conceal NONE
   Assert "NONE" ==# sneak#hl#links_to('Conceal')
 
-Execute (hl#is_valid() handles non-existent hl group):
-  Assert 0 == sneak#hl#is_valid('Derp')
+Execute (hl#get() handles non-existent hl group):
+  Assert '' == sneak#hl#get('Derp')
+
+Execute (hl#get() returns text definition of highlight group):
+  hi Cursor guifg=white guibg=#0a9dff ctermfg=16 ctermbg=253
+  Assert match(sneak#hl#get('Cursor'), '\Vctermbg=253')
 
 Execute (streak#sanitize_target_labels()):
   call sneak#streak#init()