texlua manual.lua not usable to non-Windows users

[muzimuzhi]

Here I have to apply patch

diff --git a/manual.lua b/manual.lua
index 1d6b44e..0abd3a9 100644
--- a/manual.lua
+++ b/manual.lua
@@ -7,7 +7,8 @@ local function ReadFile(input)
     print("Error in reading " .. input)
     return
   end
-  local text = f:read("*all")
+  -- normalize line endings, https://stackoverflow.com/a/20599512
+  local text = f:read("*all"):gsub('\r\n?', '\n')
   f:close()
   return text
 end

to overcome lua error

manual.lua:29: attempt to concatenate a nil value (local 'body')

thrown when executing texlua manual.lua. Even then, a Git warning

warning: in the working copy of 'tabularray.tex', LF will be replaced by CRLF the next time Git touches it

is encountered.

tabularray (and perhaps other open source repos by the same author) need a workflow to allow users on OS's using different EOL characters working together.

Originally posted by @muzimuzhi in #443 (comment)

I guess replacing "rb" and "wb" with "r' and "w" will solve eol problem among different operating systems, if we also modify MakeManual function below, adding some \r characters.

local function ReadFile(input)
  local f = io.open(input, "rb")
  if f == nil then
    print("Error in reading " .. input)
    return
  end
  local text = f:read("*all")
  f:close()
  return text
end

local function WriteFile(output, text)
  f = io.open(output, "wb")
  f:write(text)
  f:close()
end

Originally posted by @lvjr in #443 (comment)