From 481a894fd4c016cddb95d3b4d6bc24429990ffdd Mon Sep 17 00:00:00 2001
From: John Kerl <kerl.john.r@gmail.com>
Date: Wed, 26 Aug 2020 23:41:15 -0400
Subject: [PATCH] neaten

---
 ...c_dkvp_reader.go => record_reader_dkvp.go} |  0
 go/src/mapping/mapper_nothing.go              | 24 +++++++++++
 go/src/mapping/record_mapper_factory.go       |  1 +
 go/todo.txt                                   | 43 ++++++-------------
 4 files changed, 38 insertions(+), 30 deletions(-)
 rename go/src/input/{lrec_dkvp_reader.go => record_reader_dkvp.go} (100%)
 create mode 100644 go/src/mapping/mapper_nothing.go

diff --git a/go/src/input/lrec_dkvp_reader.go b/go/src/input/record_reader_dkvp.go
similarity index 100%
rename from go/src/input/lrec_dkvp_reader.go
rename to go/src/input/record_reader_dkvp.go
diff --git a/go/src/mapping/mapper_nothing.go b/go/src/mapping/mapper_nothing.go
new file mode 100644
index 000000000..2d230677b
--- /dev/null
+++ b/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
+	}
+}
diff --git a/go/src/mapping/record_mapper_factory.go b/go/src/mapping/record_mapper_factory.go
index 6804bc620..533f7513d 100644
--- a/go/src/mapping/record_mapper_factory.go
+++ b/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
 	}
diff --git a/go/todo.txt b/go/todo.txt
index 0dd277639..a7beb8800 100644
--- a/go/todo.txt
+++ b/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