From cbdba2dcb938379bcc6971b687e864198a5b9615 Mon Sep 17 00:00:00 2001
From: Olivier Roques <olivier@oroques.dev>
Date: Sat, 22 May 2021 00:51:10 +0200
Subject: [PATCH] Fix #14: improve inactive window detection

---
 lua/hardline.lua    | 14 +++++++++++---
 plugin/hardline.vim |  5 +++++
 2 files changed, 16 insertions(+), 3 deletions(-)

diff --git a/lua/hardline.lua b/lua/hardline.lua
index 740763f..f2d1154 100644
--- a/lua/hardline.lua
+++ b/lua/hardline.lua
@@ -4,7 +4,7 @@
 
 -------------------- VARIABLES -----------------------------
 local fn, cmd, vim = vim.fn, vim.cmd, vim
-local o, wo = vim.o, vim.wo
+local g, o, wo = vim.g, vim.o, vim.wo
 local fmt = string.format
 local common = require('hardline.common')
 local bufferline = require('hardline.bufferline')
@@ -139,18 +139,26 @@ end
 
 -------------------- STATUSLINE ----------------------------
 function M.update_statusline()
-  local sections = cache.previous
+  local sections = cache[g.statusline_winid]
   if common.is_active() or not sections then
     sections = M.options.sections
     sections = remove_hidden_sections(sections)
     sections = load_sections(sections)
     sections = remove_empty_sections(sections)
     sections = aggregate_sections(sections)
-    cache.previous, cache.current = cache.current, sections
+    cache[g.statusline_winid] = sections
   end
   return table.concat(highlight_sections(sections))
 end
 
+function M.clear_cache()
+  for winid, _ in pairs(cache) do
+    if fn.win_id2win(winid) == 0 then
+      cache[winid] = nil
+    end
+  end
+end
+
 -------------------- BUFFERLINE ----------------------------
 function M.update_bufferline()
   local sections = {}
diff --git a/plugin/hardline.vim b/plugin/hardline.vim
index c24cddc..b3e5baf 100644
--- a/plugin/hardline.vim
+++ b/plugin/hardline.vim
@@ -7,3 +7,8 @@ if exists('g:loaded_hardline')
 endif
 
 let g:loaded_hardline = 1
+
+augroup hardline
+  autocmd!
+  autocmd WinClosed * lua require('hardline').clear_cache()
+augroup END