neaten

go/src/mapping/mapper_nothing.go

@@ -0,0 +1,24 @@
+package mapping
+
+import (
+	"containers"
+)
+
+type MapperNothing struct {
+	// stateless
+}
+
+func NewMapperNothing() *MapperNothing {
+	return &MapperNothing {
+	}
+}
+
+func (this *MapperNothing) Name() string {
+	return "nothing"
+}
+
+func (this *MapperNothing) Map(inrec *containers.Lrec, outrecs chan<- *containers.Lrec) {
+	if inrec == nil { // end of stream
+		outrecs <- inrec
+	}
+}

go/src/mapping/record_mapper_factory.go

@@ -3,6 +3,7 @@ package mapping
 func Create(mapperName string) RecordMapper {
 	switch mapperName {
 	case "cat": return NewMapperCat()
+	case "nothing": return NewMapperNothing()
 	case "tac": return NewMapperTac()
 	default: return nil
 	}

go/todo.txt

@@ -1,32 +1,15 @@
-* input.RecordReader interface
-* impls:
-  o dkvp
-  o xtab
-  o csv
-  o streaming json
-  o etc
-* factory
-* remove argf
-* needs fresh start on each new filename
+* lots of trivial things are just a matter of keystroking
+* defer them while focusing on what's hard (and maybe most worthwhile about the Go port)
 
-* mapper interface
-* impls:
-  o cat
-  o cut
-  o head
-  o tail
-  o count
-  o ... lots more over time (if ever)
-  o defer DSL for a good long while
-* factory
-* defer then-chaining for the merest of moments
-  o needs []mapchan in the streamer
+harder / more worthy:
+* streaming JSON reader
+* streaming RFC-compliant CSV reader
+* sort
+* stats1
+* DSL
+* calendar/DST/TZ
 
-* output.RecordWriter interface
-* impls:
-  o dkvp
-  o xtab
-  o csv
-  o json
-  o etc
-* factory
+easier:
+* most of the verbs
+* most of the file formats
+* then-chaining