ccwl: Make #:stderr and #:stdout first class parameters.

#:stderr and #:stdout, especially #:stdout, are commonly
required. They ought to be first class parameters and not tucked away
into #:other.

* ccwl/ccwl.scm (<command>)[stderr, stdout]: New fields.
* ccwl/ccwl.scm (command): Accept #:stderr and #:stdout as first class
parameters.
* ccwl/cwl.scm (command->cwl-scm): Serialize stderr and stdout fields.
* doc/capture-stdout.scm (print),
doc/decompress-compile-run.scm (run), doc/checksum.scm (md5sum,
sha1sum, sha256sum), doc/spell-check.scm (find-misspellings): Capture
stdout in file.
* doc/checksum.scm, doc/decompress-compile-run.scm:
* doc/ccwl.skb (Tutorial)[Capturing the standard output stream of a
command]: Document #:stdout first class parameter.
* doc/ccwl.skb (Tutorial)[Workflow with multiple steps]: Capture
stdout in explicitly named files.
* tests/ccwl.scm ("commands with non-string #:stderr parameters must
raise a &ccwl-violation condition", "commands with non-string #:stdout
parameters must raise a &ccwl-violation condition"): New tests.

1 files changed, 2 insertions, 1 deletions

diff --git a/doc/spell-check.scm b/doc/spell-check.scm
index 1f05154..d5ccebb 100644
--- a/doc/spell-check.scm
+++ b/doc/spell-check.scm
@@ -19,7 +19,8 @@
 (define find-misspellings
   (command #:inputs words dictionary
            #:run "comm" "-23" words dictionary
-           #:outputs (misspellings #:type stdout)))
+           #:outputs (misspellings #:type stdout)
+           #:stdout "misspelt-words"))
 
 (workflow (text-file dictionary)
   (pipe (tee (pipe (split-words #:text text-file)