punkshell/scriptlib/tests/pipeswitch.tcl

package require punk
package require shellfilter
foreach d [debug names] {
    #debug off $d
}


proc  test1 {} {
    alsoresult,data@@DATA.=\
    result@1/1,returnvalue,status@0.=\
    pipeswitch {
        puts stderr "pre pipecase code always runs"
        
        pipecase pipenomatchvar nomatch1 ,'p1v0'@0.= val {p1v0x b c} |> {
            puts stdout "pipecase1 $data"
            set data
        }
        
        # in between
        puts stderr "code after unmatched but before matched will run"
        
        pipecase pipenomatchvar nomatch2 input,'p2v1'@1.= val {x p2v1 z} |> {
            puts stdout "pipecase2 $data"
            return [list source pipecase2 data $data]
        }                                       |> {
            string toupper $data
        }
        
        pipecase ,'p3v3'@2.= val {d e p3v3x} |> {
            puts stdout "pipecase3 $data"
            set data
        }
        
        puts stderr "no matches"
        return nomatch
    }
    
    puts stdout "returnvalue of pipeswitch return is: $returnvalue"
    puts stdout "[a+ yellow bold]nomatch var pipe1: $nomatch1[a+]"
    puts stdout "nomatch destructured to 'matchinfo': [mi@@error/mismatch/matchinfo= $nomatch1]"
    puts stdout "[a+ green bold]nomatch var pipe2 (empty if there was a match): $nomatch2[a+]"
    puts stdout "value of pipeswitch result is: $result"
    puts stdout "status of pipeswitch is: $status"
    puts stdout "alsoresult:$alsoresult"
    puts stdout "dict destructuring, DATA key = $data"
}
test1

puts stderr "proc test follows"
proc  match_args {args} {
    set arglist $args
    procresult,'ok'@0.= pipeswitch {
        puts stdout "----$arglist"
        pipecase p1,'a'@0.= val $args |> string toupper |> {
            puts stderr "p1 data:'$data'"
            return [list source pipecase1 data $data]
        }
        
        pipecase p2,'x'@0,'y'@1.= val $args |> {
            return [list source pipecase2 data $data]
        }
        
        pipecase p3,'x'@0.= val $args |> {
            return [list source pipecase3 data [list transformed {*}$data]]
        }
        
        pipecase .= val $args |> {
            puts "catchall pipe4 $data"
            return $data
        }
    } {*}$args
    #scope is ok - but pipeswitch overrides'args' so we need to either pass them in, or set another variable  - Review.
}
puts "match_args a b c : [match_args a b c]"
puts "match_args x y z : [match_args x y z]"
puts "match_args x Y z : [match_args x Y z]"
puts "match_args other blah : [match_args other blah]"