add nextflow d30e48d

nextflow/tests/nullable-path.nf

@@ -0,0 +1,36 @@
+#!/usr/bin/env nextflow
+
+nextflow.enable.types = true
+
+process foo {
+    input:
+    id: String
+
+    output:
+    file('output.txt', optional: true)
+
+    script:
+    """
+    echo ${id}
+    """
+}
+
+process bar {
+    input:
+    input: Path?
+
+    stage:
+    stageAs input, 'input.txt'
+
+    output:
+    stdout()
+
+    script:
+    '''
+    [[ -f input.txt ]] && cat input.txt || echo 'empty input'
+    '''
+}
+
+workflow {
+    bar(foo(channel.of('foo'))).view()
+}