fix(statusline): set hl_group for statusline separators

Fixes #569

Author: danielwe

lua/trouble/api.lua

@@ -184,10 +184,7 @@ function M.statusline(opts)
       end
       renderer:clear()
       renderer:sections({ section })
-      status = renderer:statusline()
-      if opts.hl_group then
-        status = require("trouble.config.highlights").fix_statusline(status, opts.hl_group)
-      end
+      status = renderer:statusline({ hl_group = opts.hl_group })
       return status
     end,
   }

lua/trouble/config/highlights.lua

@@ -93,21 +93,22 @@ function M.source(source, links)
 end
 
 M._fixed = {} ---@type table<string, string>
----@param sl string
-function M.fix_statusline(sl, statusline_hl)
-  local bg = vim.api.nvim_get_hl(0, { name = statusline_hl, link = false })
-  bg = bg and bg.bg or nil
-
-  return sl:gsub("%%#(.-)#", function(hl)
-    if not M._fixed[hl] then
-      local opts = vim.api.nvim_get_hl(0, { name = hl, link = false }) or {}
-      opts.bg = bg
-      local group = "TroubleStatusline" .. vim.tbl_count(M._fixed)
-      vim.api.nvim_set_hl(0, group, opts)
-      M._fixed[hl] = group
-    end
-    return "%#" .. M._fixed[hl] .. "#"
-  end)
+---@param hl string
+---@param statusline_hl string?
+function M.fix_statusline_bg(hl, statusline_hl)
+  if not statusline_hl then
+    return hl
+  end
+  local key = hl .. "_" .. statusline_hl
+  if not M._fixed[key] then
+    local opts = vim.api.nvim_get_hl(0, { name = hl, link = false }) or {}
+    local statusline_opts = vim.api.nvim_get_hl(0, { name = statusline_hl, link = false })
+    opts.bg = statusline_opts and statusline_opts.bg or nil
+    local group = "TroubleStatusline" .. vim.tbl_count(M._fixed)
+    vim.api.nvim_set_hl(0, group, opts)
+    M._fixed[key] = group
+  end
+  return M._fixed[key]
 end
 
 return M

lua/trouble/view/text.lua

@@ -104,20 +104,28 @@ function M:nl()
   return self
 end
 
----@param opts? {sep?:string}
+---@param opts? {sep?:string,hl_group?:string}
 function M:statusline(opts)
   local sep = opts and opts.sep or " "
+  local hl_group = opts and opts.hl_group or nil
+  if hl_group then
+    sep = ("%%#%s#%s%%*"):format(hl_group, sep)
+  end
   local lines = {} ---@type string[]
   for _, line in ipairs(self._lines) do
     local parts = {}
     for _, segment in ipairs(line) do
       local str = segment.str:gsub("%%", "%%%%")
-      if segment.hl then
-        str = ("%%#%s#%s%%*"):format(segment.hl, str)
+      local fix_statusline_bg = require("trouble.config.highlights").fix_statusline_bg
+      local hl = segment.hl and fix_statusline_bg(segment.hl, hl_group) or hl_group
+      if hl then
+        str = ("%%#%s#%s%%*"):format(hl, str)
       end
       parts[#parts + 1] = str
     end
-    table.insert(lines, table.concat(parts, ""))
+    if #parts ~= 0 then
+      table.insert(lines, table.concat(parts, ""))
+    end
   end
   return table.concat(lines, sep)
 end