From e094a03d8cd2dc1a96acefc7a861c9ebb0ff02cf Mon Sep 17 00:00:00 2001
From: Olivier Roques <olivier@oroques.dev>
Date: Mon, 28 Dec 2020 11:19:05 +0100
Subject: [PATCH] Add unique_tail formatter

---
 lua/hardline.lua            |  3 ++-
 lua/hardline/bufferline.lua | 28 +++++++++++++++++++++++++++-
 plugin/hardline.vim         |  2 --
 3 files changed, 29 insertions(+), 4 deletions(-)

diff --git a/lua/hardline.lua b/lua/hardline.lua
index b063e1c..72ca03e 100644
--- a/lua/hardline.lua
+++ b/lua/hardline.lua
@@ -65,12 +65,13 @@ end
 local function set_hlgroups()
   for class, attr in pairs(M.options.theme) do
     for state, args in pairs(attr) do
+      local hlgroup = string.format('Hardline_%s_%s', class, state)
       local a = {}
       for k, v in pairs(args) do
         table.insert(a, string.format('%s=%s', k, v))
       end
       a = table.concat(a, ' ')
-      cmd(string.format('hi Hardline_%s_%s %s', class, state, a))
+      cmd(string.format('autocmd ColorScheme * hi %s %s', hlgroup, a))
     end
   end
 end
diff --git a/lua/hardline/bufferline.lua b/lua/hardline/bufferline.lua
index 635a647..85b7437 100644
--- a/lua/hardline/bufferline.lua
+++ b/lua/hardline/bufferline.lua
@@ -1,9 +1,34 @@
-local fn = vim.fn
+local fn, vim = vim.fn, vim
 
 local function exclude(bufnr)
   return (fn.buflisted(bufnr) == 0 or fn.getbufvar(bufnr, '&filetype') == 'qf')
 end
 
+local function get_head(path, tail)
+  local result = path
+  for i = 1, #vim.split(tail, '/', true) do
+    result = fn.fnamemodify(result, ':~:h')
+  end
+  return fn.fnamemodify(result, ':t')
+end
+
+local function unique_tail(buffers)
+  local hist = {}
+  local duplicate = false
+  for _, buffer in ipairs(buffers) do
+    hist[buffer.name] = not hist[buffer.name] and 1 or hist[buffer.name] + 1
+    duplicate = duplicate or hist[buffer.name] > 1
+  end
+  if not duplicate then return end
+  for _, buffer in ipairs(buffers) do
+    if hist[buffer.name] > 1 then
+      local parent = get_head(fn.bufname(buffer.bufnr), buffer.name)
+      buffer.name = string.format('%s/%s', parent, buffer.name)
+    end
+  end
+  unique_tail(buffers)
+end
+
 local function to_section(buffer)
   local flags = {}
   local item = buffer.name == '' and '[No Name]' or buffer.name
@@ -37,6 +62,7 @@ local function get_buffers()
       })
     end
   end
+  unique_tail(buffers)
   return buffers
 end
 
diff --git a/plugin/hardline.vim b/plugin/hardline.vim
index 3bc8786..c24cddc 100644
--- a/plugin/hardline.vim
+++ b/plugin/hardline.vim
@@ -6,6 +6,4 @@ if exists('g:loaded_hardline')
   finish
 endif
 
-lua require('hardline').setup {}
-
 let g:loaded_hardline = 1