[e-lang] simple question

[Kevin Reid]

On Aug 15, 2006, at 15:59, Matej Kosik wrote:

> I am not sure how to work with CapDesk (I've launched it; I saw some
> directories; I have tried to "install" the capEdit.capplet but it  
> failed
> with the following message:
>
>     starting run prep
>     made scope 2
>
>     # value: <capEditCapletAuthor>
>     shown
>     about to get requestsTree
>     got requestsTree
>     requests retrieval failed: problem: Prefix doesn't match: visit

This is a bug in E 0.8.35f I've seen myself. It has been fixed since  
but there is no newer release yet.

> E programs cannot be run in safeMode without CapDesk? For example:
> running a E program and giving it (at startup) capability to some
> object...which, for example, enables it to write 10 lines to some  
> file.
> Or something similar. (just a proposal)

Of course they can.

   ? def makeEParser := <import:org.erights.e.elang.syntax.makeEParser>

   ? def program := makeEParser.run(<file:///home/kosik/program.e>)
   # value: e`...`

   ? def object := program.eval(safeScope)
   # value: <programWithoutAuthority>

   ? var alive := true
   ? def writer(text) {
   >   require(alive)
   >   alive := false
   >   def lines := text.split("\n")
   >   <file:///home/kosik/output.txt>.appendText(
   >     "\n".join(lines(0, 10.min(lines.size())))
   >   )
   > }

   ? object.run(writer)

-- 
Kevin Reid                            <http://homepage.mac.com/kpreid/>