pengines_io does not affect submodules #38
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Just a quick reply now. The pengines_io rebinds write/1, etc. to make nice Prolog terms. It does so by redefining these terms. There is not much choice: once you have a stream that contains a mixture of text and terms it gets hard. That is why it doesn't work for subodules. In addition the library rebinds the standard I/O streams to cacture output and forwards it to the client. That provides raw This whole stuff is primarily there to make SWISH work. You best look at the swish source to see how it is deployed. |
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Let
server.plconsist of the following code::- module(server, []). :- use_module(library(pengines)). :- use_module(library(http/thread_httpd)). :- use_module(library(http/http_dispatch)). :- use_module(library(http/http_server_files)). :- use_module(library(http/http_files)). :- use_module(library(http/http_unix_daemon)). :- pengine_application(myapp). :- use_module(myapp:library(pengines_io)). pengines:prepare_module(Module, myapp, _Options) :- pengines_io:pengine_bind_io_to_html(Module). :- use_module(myapp:interaction). :- http_handler(/, http_reply_from_files(., []), [prefix]).This is very similar to the code in #37, except that the server now uses a further module, provided by the file
interaction.plwith the following content::- module(interaction, [main/0]). main :- format("hello!", []).The intention here is that
format/2in the submodule should also be rewritten (or reinterpreted) bypengines_io, so that I get decorated output from the submodule without having to change the submodule's code.As a test case, I use
demo.html:<!DOCTYPE html> <html lang="en"> <head> <title>Demo</title> <script src="js/pengines.js"></script> </head> <body style="padding-left: 5%; padding-right: 5%"> <br><br> <script> var p = new Pengine({ oncreate: function () { p.ask('main'); }, onoutput: function () { console.log(this.data); }, application: "myapp", server: "pengine", }); </script> </body> </html>Please start the server with:
and then visit
http://localhost:5055/demo.html.Judging from the JavaScript console,
main/0is not affected by thepengines_iodeclarations inserver.pl.Is this the intended behaviour? If so, could you please explain how I can obtain decorated output in the submodule too? Thank you!
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