Re: [NTG-context] how to set the name of outputfile using a value defined in the source

21 Sep 2018


      On 9/21/2018 12:05 PM, luigi scarso wrote:
...
On Fri, Sep 21, 2018 at 11:06 AM Taco Hoekwater mailto:taco@elvenkind.com> wrote:
Hi,
> On 21 Sep 2018, at 10:59, luigi scarso mailto:luigi.scarso@gmail.com> wrote:
     >
     >
     > % start demo
     > \enabledirectives[system.callbacks.permitoverloads]
     > % previous line allows redefinition of ‘wrapup_run’
     > iirc ,
     > this should be avoided ….
Sure, but I find wrapup_run extremely useful, and I know of no other
    way to use it.
sure but the idea of modifying the context state (broadly speaking) 
before that context says that the state is consistent
(ie the run is  finished, in this case) is , how to say.. hm hm.
Maybe signalling with an asyn msg that has nothing todo with the context 
state (just to say "Hey, context here: I am finishing the run" to 
somebofy else) ,
but usually one wants  also to check the starts and the end of the run 
as process, ie just before the run starts and just after the run ended.
This case seems safe but I have already dubious on \
$ lua -e ' os.execute("ls \c*") '
lua: (command line):1: invalid escape sequence near '\c'
while
$ lua -e ' os.execute([[ls \c*]])'
is ok
Also,  I run context foo.tex and at the end  of the runs I found foo.pdf 
(expected) and doc-<idcode>.pdf ("hm .. where does it come from ? I dont 
remember ...I have to look into the source" )
so two times the space --- and the copy is done at each run, iirc.
But it's just to complete the picture:  once one  knows the limits, it's 
a useful callback.
that callback is really the last ... files have been closed then

here is a (future) safe rename variant (assuming \MyID is defined):

     luatex.wrapup(function()
         local oldname = file.addsuffix(environment.jobname,"pdf")
         local newname = file.addsuffix("doc-\MyId","pdf")
         if lfs.isfile(newname) then
             logs.reporter("system","removing %a",newname)
             os.remove(newname)
         end
         if not lfs.isfile(newname) then
             logs.reporter("system","renaming %a to %a",oldname,newname)
             os.rename(oldname,newname)
         end
         if not lfs.isfile(newname) then
             logs.reporter("system","error in renaming")
         end
     end)


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