Re: [NTG-context] "error not related to input file"

16 Dec 2019

      On Sat, Dec 14, 2019 at 10:31:20PM +0100, Hans Hagen wrote:
...
On 12/14/2019 5:43 PM, Rudolf Bahr wrote:
...
Hello All,
In:
LuaMetaTeX, Version 2.03.3
ConTeXt  ver: 2019.12.12 19:35 MKIV beta  fmt: 2019.12.12  int: english/english
I get the following error message:
tex error       > error not related to input file:
tex error       >   tex: ! Emergency stop
tex error       >   lua: ?
tex error       >   mps: -
In LuaTeX ... I get a "*" instead of the error message above.
And again my program does all what it should, but a grey pdf-page too.
Sorry, no MWE available.
On Sat, Dec 14, 2019 at 07:27:34PM +0100, Otared Kavian wrote:
...
Since I have also suffered somewhat from the cryptic (and often useless…) error messages, I understand your frustration :-)
Now, maybe if you do 
  context --directives="system.showerror" myfile.tex
then you get a file named « myfile-status.html » which is more helpful.
On Sat, Dec 14, 2019 at 10:31:20PM +0100, Hans Hagen wrote:
...
normally an * means: waiting for input .... and no message is then involved
as in principle there is no real error, apart from waiting for input
Otared and Hans, thank you for your answers and Otared especially for your
sympathy! :-)

In the meantime I could get rid of "! Emergency stop" and "*" by changing
a \def-command which calls a luacode subprogram; see further down in my MWE.

My program run now looks essentially better, but "--directives="system.showerror" 
and "<my program>-status.html" still report an error: "! Undefined control sequence"
without telling which control sequence is undefined. How reliable is this error
message? I don't know of control sequences in luacode or what does this error message
mean?

Here is a MWE which shows my program structure. Sorry, this MWE works really :-)
During my attempts to find the error I got for a short time the message: "Invalid
\starttext ... \stoptext structure" which I don't understand.

--------------------------------------------------- MWE -------------------------------
\def\projectpath{/home/sam/trip-2019/}

\startluacode
   userdata = userdata or {}
   u = userdata

   function u.table_save ( tab, file )
      local tab   = tab
      local file  = file

      dofile ("table_save_u_table_load.lua")
      table.save(tab, file)
   end

   function u.Init ( col )

      local col  = col 
      local ppth = tokens.getters.macro("projectpath")
      local xO   = tokens.getters.macro("xO")
      local yO   = tokens.getters.macro("yO")

      local I = {}	-- Table of initial values
      I ["projectpath"] = ppth
      I ["column"]      = {}
      I ["column"][col] = {}
      I ["column"][col]["layerpos"] = {}
      I ["column"][col]["layerpos"] ["xO"] = xO
      I ["column"][col]["layerpos"] ["yO"] = yO

      u.table_save(I,"I-Table.lua") 
   end

\stopluacode

%\def\Init #1 {\ctxlua {u.Init ([==[#1]==]) }}% --the blanks produced my "! Emergency stop"
\def\Init#1{\ctxlua{u.Init([==[#1]==])}}%       --in this form the command works 

\starttext
   \def\Column{A}%
   \def\xO{0}%  in pt
   \def\yO{20}% in pt

   \Init{\Column}%%
\stoptext
---------------------------------------------------------------------------------------
For those possibly interested in running this MWE I append "table_save_u_table_load.lua",
a lua program to save and reload lua tables, found in the lua homepage. Anyway, the
resulting flattened table "I" is here:

return {
-- Table: {1}
{
   ["column"]={2},
   ["projectpath"]="/home/sam/trip-2019/",
},
-- Table: {2}
{
   ["A"]={3},
},
-- Table: {3}
{
   ["layerpos"]={4},
},
-- Table: {4}
{
   ["yO"]="20",
   ["xO"]="0",
},
}

I think nobody will be able to help me in this case, I myself have to try again and 
again to finally find the error. If so, this would be the nicest christmas gift to me :-)

Best regards,

Rudolf