Re: libseed-list interpreter, reading stdout

["Alan Knowles" <alan akbkhome com>]

I ended up giving up when doing something similar.

Since I was doing all sorts of GIR calls, I would often segfault the whole application by running the wrong thing in the sandbox.

I ended up using a vte,  and running another instance of seed and using a temporary file..
http://devel.akbkhome.com/seed/Vte.html

Regards
Alan

 --- On 29/Jun/2010, Jonatan Liljedahl wrote: 
> Hi,
> I'm making an interpreter program that creates a gtk window with a 
> textview for log output, and listens on stdin. Every line that comes in 
> is appended to a buffer until ^E is encountered, then the buffer is 
> evaluated.
> 
> I use this as a plugin for gedit, so that I can select text in a 
> document and evaluate it in the seed interpreter while it's running, and 
> since it's running a gtk mainloop I can use all stuff that needs this, 
> like creating windows, setting up timers, etc "live".. (Right now it 
> also parses the code through my AlgoScript parser, but it would be easy 
> to bypass this for a flexible seed live-coding environment.)
> 
> Now to the problem, for print() I can simply set ctx.global.print = 
> myprint, where the latter is a function that appends text to the log 
> window instead. But this doesn't work in all cases, since any imported 
> module gets the default original print function in their context again, 
> and also any errors or warnings printed from the C code still gets to 
> stdout.. (like g_warning())
> 
> One solution would be to use GLib.set_print_handler(), 
> set_printerr_handler() and set_log_handler(), but these doesn't seem to 
> work (probably needs some wrapper to call a supplied JS callback).
> 
> So instead I want to just capture stdout, which would work for 
> everything. I know how to capture stdout from a child process, but how 
> do I capture my own stdout? I tried stuff like this:
> 
> //var fd = os.dup(1);
> var fd = 1;
> var stdout = GLib.io_channel_unix_new(fd);
> GLib.io_channel_set_flags(stdout,GLib.IOFlags.NONBLOCK);
> GLib.io_add_watch(stdout, 0, GLib.IOCondition.IN, function(source, 
> condition, data) {
>      var x = new GLib.String;
>      GLib.io_channel_read_line_string(source,x);
>      _print(x.str);
>      return true;
> });
> 
> But all I can make it do is to redirect everything from stdin to this 
> watcher (why this happens I don't understand), still triggering my 
> stdin-watcher but only giving it empty strings..
> 
> /Jonatan
> _______________________________________________
> libseed-list mailing list
> libseed-list gnome org
> http://mail.gnome.org/mailman/listinfo/libseed-list