From 63010bcbd5eb8531a026c5d23c90d6ef88cee0b4 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Steffen=20M=C3=B6ller?= <steffen_moeller@gmx.de>
Date: Tue, 16 Feb 2016 03:28:07 +0100
Subject: [PATCH] simplify hello.cwl

The first encounter with the cwl for executing something needs to be as simple as ... donno ... something really simple.  The traditional "Hello world!" for instance does not need any input. It is a mere generator.

When executing the cwltool, I was asked if I wanted to to run #echocmd or #main. So, if #main is obsolete, which is good, then I strongly suggest not to have it with hello. With a bit of an imagination the CommandLineTool is a special kind of workflow, i.e. one that cannot nest or interconnect other workflows but wraps a tool. Then it is just fine to execute it direcly.

The input line should not be required for a command line. A missing such should just be interpreted as 'no inputs'.

I also removed the "stdout" line to make it more interactive, i.e. just like the original.
---
 workflows/hello/hello.cwl | 32 +++++---------------------------
 1 file changed, 5 insertions(+), 27 deletions(-)

diff --git a/workflows/hello/hello.cwl b/workflows/hello/hello.cwl
index 707ad31d3..6c72c1c21 100644
--- a/workflows/hello/hello.cwl
+++ b/workflows/hello/hello.cwl
@@ -1,15 +1,8 @@
 #!/usr/bin/env cwl-runner
 
-
 - id: "#echocmd"
   class: CommandLineTool
-  inputs:
-    - id: "#echo-in"
-      type: string
-      label: "Message"
-      description: "The message to print"
-      default: "Hello World"
-      inputBinding: {}
+  inputs: []
   outputs:
     - id: "#echo-out"
       type: File
@@ -18,22 +11,7 @@
       outputBinding:
         glob: messageout.txt
   baseCommand: echo
-  stdout: messageout.txt
-
-- id: "#main"
-  class: Workflow
-  label: "Hello World"
-  description: "Puts a message into a file using echo"
-  inputs: []
-  outputs:
-    - id: "#main.output"
-      type: File
-      source: "#echocmd.echo-out"
-  steps :
-    - id: "#step0"
-      run: {import: "#echocmd"}
-      inputs: []
-      outputs:
-        - { id: "#echocmd.echo-out" }
-
-
+  arguments:
+   - Hello
+   - world
+   - "!"