[Swift-user] Error: Attempted to close nonexistent channel buffers

[Mihael Hategan]

What version are you using?
That error shows a bug in the Swift implementation, and it should have
been fixed, at least in SVN.

Mihael

On Thu, 2007-09-13 at 14:36 -0400, Allen, M. David wrote:
> Hello,
> 
> I'm just getting started with Swift, and trying to program a fairly
> trivial sample to get started.
> 
> My swiftscript fails with the message:
> "Execution failed:
>         grep started
> Attempted to close nonexistent channel buffers"
>  
> Can anyone point me to the documentation that describes such errors?
> This is referring to a spot in my code that is executing a very
> vanilla grep operation.  My input file is just 14 lines long, and this
> error consistently happens towards the end of the overall workflow
> execution.
>  
> The code:
>  
> type blog {
>     string name;
>     string feedURL;
> }
>  
> type file { }
>  
> (file headlines) getHeadlines(blog b) {
>         app {
>                 feeder @b.feedURL stdout=@filename(headlines);
>         }
> }
>  
> (file results[]) processBlogs(blog blogs[]) {
>  
>         foreach blog el, index in blogs {
>                 results[index] = getHeadlines( el ) ;
>         }
> }
>  
> (string matches) findSingleMatch(file input, string searchTerm) {
>         app {
>                 grep "-i" searchTerm @filename(input) stdout=@matches;
>         }
> }
>  
> (file matches) findMatches(file inputs[], string searchTerm) {
>         string final;
>  
>         foreach input, index in inputs {
>                 string intermed = findSingleMatch(input, searchTerm);
>                 final = strcat(final, intermed);
>         }
>  
>         matches = dumpString(final);
> }
>  
> (int retVal) debug(string m) {
>         app {
>                 echo m ;
>         }
> }
>  
> (file t) dumpString(string m) {
>     app {
>         echo m stdout=@filename(t);
>     }
> }
>  
> blog blogs[]  <csv_mapper; file="blogs.csv", delim=",",
> header="true">;
> file output[] <simple_mapper;
> prefix="output/blogHeadlines",suffix=".txt">;
> file final <simple_mapper; prefix="output/result", suffix=".txt">;
>  
> output = processBlogs(blogs);
> final = findMatches(output, "ARG 0");
> 
> Any help would be greatly appreciated.
> --
> M. David Allen
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