feat: reorder tabs with mouse

Depends on neovim/neovim##23947

devsession

@@ -0,0 +1,118 @@
+let SessionLoad = 1
+let s:so_save = &g:so | let s:siso_save = &g:siso | setg so=0 siso=0 | setl so=-1 siso=-1
+let v:this_session=expand("<sfile>:p")
+silent only
+silent tabonly
+cd ~/projects/lua/cokeline
+if expand('%') == '' && !&modified && line('$') <= 1 && getline(1) == ''
+  let s:wipebuf = bufnr('%')
+endif
+let s:shortmess_save = &shortmess
+if &shortmess =~ 'A'
+  set shortmess=aoOA
+else
+  set shortmess=aoO
+endif
+badd +144 lua/cokeline/hover.lua
+badd +89 lua/cokeline/handlers.lua
+badd +349 lua/cokeline/buffers.lua
+badd +1 lua/cokeline/mappings.lua
+argglobal
+%argdel
+$argadd lua/cokeline/hover.lua
+edit lua/cokeline/hover.lua
+wincmd t
+let s:save_winminheight = &winminheight
+let s:save_winminwidth = &winminwidth
+set winminheight=0
+set winheight=1
+set winminwidth=0
+set winwidth=1
+argglobal
+balt lua/cokeline/mappings.lua
+setlocal fdm=manual
+setlocal fde=0
+setlocal fmr={{{,}}}
+setlocal fdi=#
+setlocal fdl=99
+setlocal fml=1
+setlocal fdn=20
+setlocal fen
+silent! normal! zE
+9,10fold
+15,16fold
+23,24fold
+21,25fold
+29,30fold
+27,31fold
+34,35fold
+39,40fold
+37,41fold
+13,42fold
+47,48fold
+51,56fold
+60,66fold
+71,72fold
+76,77fold
+75,78fold
+79,80fold
+74,81fold
+69,83fold
+85,87fold
+91,92fold
+96,97fold
+95,98fold
+99,100fold
+94,101fold
+103,107fold
+50,109fold
+112,113fold
+117,118fold
+116,119fold
+120,121fold
+115,122fold
+110,125fold
+45,127fold
+158,158fold
+162,163fold
+172,173fold
+176,177fold
+175,178fold
+179,180fold
+170,182fold
+168,184fold
+185,187fold
+167,189fold
+166,190fold
+161,191fold
+let &fdl = &fdl
+161
+normal! zo
+166
+normal! zo
+167
+normal! zo
+let s:l = 144 - ((16 * winheight(0) + 22) / 45)
+if s:l < 1 | let s:l = 1 | endif
+keepjumps exe s:l
+normal! zt
+keepjumps 144
+normal! 07|
+tabnext 1
+if exists('s:wipebuf') && len(win_findbuf(s:wipebuf)) == 0 && getbufvar(s:wipebuf, '&buftype') isnot# 'terminal'
+  silent exe 'bwipe ' . s:wipebuf
+endif
+unlet! s:wipebuf
+set winheight=1 winwidth=20
+let &shortmess = s:shortmess_save
+let &winminheight = s:save_winminheight
+let &winminwidth = s:save_winminwidth
+let s:sx = expand("<sfile>:p:r")."x.vim"
+if filereadable(s:sx)
+  exe "source " . fnameescape(s:sx)
+endif
+let &g:so = s:so_save | let &g:siso = s:siso_save
+nohlsearch
+doautoall SessionLoadPost
+unlet SessionLoad
+" vim: set ft=vim :

lua/cokeline/hover.lua

@@ -127,14 +127,67 @@ local function on_hover(current)
   last_position = current
 end
 
+local function on_drag(pos)
+  if pos.dragging == "l" then
+    -- TODO: handle drag events
+    local current = M.get_current(pos.screencol)
+    if not current or current.kind ~= "buffer" then
+      return
+    end
+
+    if not _G.cokeline.__dragging then
+      local buf = buffers.get_buffer(current.bufnr)
+      if not buf then
+        return
+      end
+      _G.cokeline.__dragging = {
+        bufnr = current.bufnr,
+        index = buf._valid_index,
+      }
+    end
+    if _G.cokeline.__dragging.bufnr == current.bufnr then
+      return
+    end
+    if _G.cokeline.__dragging.bufnr then
+      local buf = buffers.get_buffer(_G.cokeline.__dragging.bufnr)
+      if buf and current.index then
+        buffers.move_buffer(
+          buf,
+          buffers.get_buffer(current.bufnr)._valid_index
+        )
+      end
+    end
+  end
+end
+
 function M.setup()
   if version.minor < 8 then
     return
   end
 
-  vim.api.nvim_create_autocmd("MouseMoved", {
+  vim.api.nvim_create_autocmd("MouseMove", {
     callback = function(ev)
-      on_hover(ev.data)
+      if ev.data.dragging then
+        local hov = M.hovered()
+        if hov ~= nil then
+          local buf = buffers.get_buffer(hov.bufnr)
+          if buf then
+            buf.is_hovered = false
+          end
+          if hov.kind == "buffer" then
+            if buf and hov.on_mouse_leave then
+              hov.on_mouse_leave(buf)
+            end
+          elseif hov.on_mouse_leave then
+            hov.on_mouse_leave()
+          end
+          _G.cokeline.__hovered = nil
+        end
+        on_drag(ev.data)
+      else
+        _G.cokeline.__dragging = nil
+        on_hover(ev.data)
+      end
       return "<MouseMove>"
     end,
   })