clean up node/gendemo; generation now has standard triggers.

Do regeneratation.  Some diff churn: the codegen doesn't yet jive
smoothly with a recent change made in service to go vet.
We'll want to straighten that out soon, I guess.

node/gendemo/HACKME.md → node/gendemo/README.md

@@ -10,6 +10,7 @@ who want to lay eyes on generated code without needing to get up-and-running wit
 This package is absolutely _not_ full of general purpose node implementations
 that you should use in _any_ application.
 
-The input info for the code generation is at the top of the `hax_test.go` file.
+The input info for the code generation is in `gen.go` file.
 (This'll be extracted to be its own schema file, etc, later --
 but you'll have to imagine that part; at present, it's wired directly in code.)
+The code generation is triggered by `go:generate` comments in `gen_trigger.go`.

node/gendemo/gen.go

@@ -0,0 +1,28 @@
+// +build ignore
+
+package main
+
+import (
+	"github.com/ipld/go-ipld-prime/schema"
+	gengo "github.com/ipld/go-ipld-prime/schema/gen/go"
+)
+
+func main() {
+	pkgName := "gendemo"
+	ts := schema.TypeSystem{}
+	ts.Init()
+	adjCfg := &gengo.AdjunctCfg{}
+	ts.Accumulate(schema.SpawnInt("Int"))
+	ts.Accumulate(schema.SpawnString("String"))
+	ts.Accumulate(schema.SpawnStruct("Msg3",
+		[]schema.StructField{
+			schema.SpawnStructField("whee", "Int", false, false),
+			schema.SpawnStructField("woot", "Int", false, false),
+			schema.SpawnStructField("waga", "Int", false, false),
+		},
+		schema.SpawnStructRepresentationMap(nil),
+	))
+	ts.Accumulate(schema.SpawnMap("Map__String__Msg3",
+		"String", "Msg3", false))
+	gengo.Generate(".", pkgName, ts, adjCfg)
+}

node/gendemo/gen_trigger.go

@@ -0,0 +1,4 @@
+//go:generate go run gen.go
+//go:generate gofmt -w .
+
+package gendemo

node/gendemo/hax_test.go → node/gendemo/gendemo_test.go

@@ -1,38 +1,11 @@
 package gendemo
 
 import (
-	"os/exec"
 	"testing"
 
 	"github.com/ipld/go-ipld-prime/node/tests"
-	"github.com/ipld/go-ipld-prime/schema"
-	gengo "github.com/ipld/go-ipld-prime/schema/gen/go"
 )
 
-// i am the worst person and this is the worst code
-// but it does do codegen when you test this package!
-// (it's also legitimately trash tho, because if you get a compile error, you have to manually rm the relevant files, which is not fun.)
-func init() {
-	pkgName := "gendemo"
-	ts := schema.TypeSystem{}
-	ts.Init()
-	adjCfg := &gengo.AdjunctCfg{}
-	ts.Accumulate(schema.SpawnInt("Int"))
-	ts.Accumulate(schema.SpawnString("String"))
-	ts.Accumulate(schema.SpawnStruct("Msg3",
-		[]schema.StructField{
-			schema.SpawnStructField("whee", "Int", false, false),
-			schema.SpawnStructField("woot", "Int", false, false),
-			schema.SpawnStructField("waga", "Int", false, false),
-		},
-		schema.SpawnStructRepresentationMap(nil),
-	))
-	ts.Accumulate(schema.SpawnMap("Map__String__Msg3",
-		"String", "Msg3", false))
-	gengo.Generate(".", pkgName, ts, adjCfg)
-	exec.Command("go", "fmt").Run()
-}
-
 func BenchmarkMapStrInt_3n_AssembleStandard(b *testing.B) {
 	tests.SpecBenchmarkMapStrInt_3n_AssembleStandard(b, _Msg3__Prototype{})
 }