man.lua: avoid float conversion on lua 5.3 (#7851)

    Error detected while processing function man#open_page[58]..<SNR>54_put_page:
    line    8:
    E5105: Error while calling lua chunk: /usr/share/nvim/runtime/lua/man.lua:165: Vim(let):E805: Using a Float as a Number

1 files changed, 3 insertions, 3 deletions

diff --git a/runtime/lua/man.lua b/runtime/lua/man.lua
index baa522f343..b0fbe9cc35 100644
--- a/runtime/lua/man.lua
+++ b/runtime/lua/man.lua
@@ -148,8 +148,8 @@ local function highlight_line(line, linenr)
 end
 
 local function highlight_man_page()
-  local mod = vim.api.nvim_eval("&modifiable")
-  vim.api.nvim_command("set modifiable")
+  local mod = vim.api.nvim_buf_get_option(0, "modifiable")
+  vim.api.nvim_buf_set_option(0, "modifiable", true)
 
   local lines = vim.api.nvim_buf_get_lines(0, 0, -1, false)
   for i, line in ipairs(lines) do
@@ -162,7 +162,7 @@ local function highlight_man_page()
   end
   buf_hls = {}
 
-  vim.api.nvim_command("let &modifiable = "..mod)
+  vim.api.nvim_buf_set_option(0, "modifiable", mod)
 end
 
 return { highlight_man_page = highlight_man_page }