From 267ecc7cd13c674f8c7286898334d30a07e31919 Mon Sep 17 00:00:00 2001
From: Olivier Roques <olivier@oroques.dev>
Date: Fri, 21 May 2021 20:19:33 +0200
Subject: [PATCH] Revert "Fix #14: better active window detection"

This reverts commit 680cfeb074fe8e7962d69e047e11b98f2b4c2933.
---
 lua/hardline.lua        | 56 +++++++++++++++++++++++------------------
 lua/hardline/common.lua |  7 +++++-
 plugin/hardline.vim     | 14 -----------
 3 files changed, 37 insertions(+), 40 deletions(-)

diff --git a/lua/hardline.lua b/lua/hardline.lua
index c5a6323..740763f 100644
--- a/lua/hardline.lua
+++ b/lua/hardline.lua
@@ -98,9 +98,9 @@ local function remove_hidden_sections(sections)
 end
 
 -------------------- SECTION HIGHLIGHTING ------------------
-local function get_section_state(section, active)
+local function get_section_state(section)
   if section.class == 'mode' then
-    if active then
+    if common.is_active() then
       local mode = common.modes[fn.mode()] or common.modes['?']
       return mode.state
     end
@@ -115,35 +115,40 @@ local function get_section_state(section, active)
     end
     return state
   end
-  return active and 'active' or 'inactive'
+  return common.is_active() and 'active' or 'inactive'
 end
 
-local function highlight_sections(sections, active)
-  local highlight_section = function(section)
-    if type(section) ~= 'table' then
-      return section
-    end
-    if section.class == 'none' then
-      return section.item
-    end
-    local state = get_section_state(section, active)
-    local hlgroup = fmt('Hardline_%s_%s', section.class, state)
-    if fn.hlexists(hlgroup) == 0 then
-      return section.item
-    end
-    return fmt('%%#%s#%s%%*', hlgroup, section.item)
+local function highlight_section(section)
+  if type(section) ~= 'table' then
+    return section
   end
+  if section.class == 'none' then
+    return section.item
+  end
+  local state = get_section_state(section)
+  local hlgroup = fmt('Hardline_%s_%s', section.class, state)
+  if fn.hlexists(hlgroup) == 0 then
+    return section.item
+  end
+  return fmt('%%#%s#%s%%*', hlgroup, section.item)
+end
+
+local function highlight_sections(sections)
   return vim.tbl_map(highlight_section, sections)
 end
 
 -------------------- STATUSLINE ----------------------------
-function M.update_statusline(active)
-  sections = M.options.sections
-  sections = remove_hidden_sections(sections)
-  sections = load_sections(sections)
-  sections = remove_empty_sections(sections)
-  sections = aggregate_sections(sections)
-  return table.concat(highlight_sections(sections, active))
+function M.update_statusline()
+  local sections = cache.previous
+  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
+  end
+  return table.concat(highlight_sections(sections))
 end
 
 -------------------- BUFFERLINE ----------------------------
@@ -186,7 +191,8 @@ end
 
 local function set_statusline()
   o.showmode = false
-  o.statusline = [[%!luaeval('require("hardline").update_statusline(true)')]]
+  o.statusline = [[%!luaeval('require("hardline").update_statusline()')]]
+  wo.statusline = o.statusline
 end
 
 local function set_bufferline()
diff --git a/lua/hardline/common.lua b/lua/hardline/common.lua
index 44ace8a..446e377 100644
--- a/lua/hardline/common.lua
+++ b/lua/hardline/common.lua
@@ -1,4 +1,5 @@
-local cmd = vim.cmd
+local cmd, fn = vim.cmd, vim.fn
+local g = vim.g
 local fmt = string.format
 local M = {}
 
@@ -23,6 +24,10 @@ function M.echo(hlgroup, msg)
   cmd('echohl None')
 end
 
+function M.is_active()
+  return g.statusline_winid == fn.win_getid()
+end
+
 function M.set_cache_autocmds(augroup)
   cmd(fmt('augroup %s', augroup))
   cmd('autocmd!')
diff --git a/plugin/hardline.vim b/plugin/hardline.vim
index 6883541..c24cddc 100644
--- a/plugin/hardline.vim
+++ b/plugin/hardline.vim
@@ -7,17 +7,3 @@ if exists('g:loaded_hardline')
 endif
 
 let g:loaded_hardline = 1
-
-function! ActiveLine()
-  return luaeval('require("hardline").update_statusline(true)')
-endfunction
-
-function! InactiveLine()
-  return luaeval('require("hardline").update_statusline(false)')
-endfunction
-
-augroup hardline
-  autocmd!
-  autocmd WinEnter,BufEnter * setlocal statusline=%!ActiveLine()
-  autocmd WinLeave,BufLeave * setlocal statusline=%!InactiveLine()
-augroup END