chore: refactor go-runtime build (#2745)

this file was becoming difficult to reason with, particularly in regards
to generating imports in the scaffolded files

fixes redundancies and unifies the logic for generating imports across
the various sources that may require importing. also ensures everything
goes through the logic @matt2e added to avoid import conflicts

go-runtime/compile/build-template/.ftl.tmpl/go/main/main.go.tmpl

@@ -1,57 +1,47 @@
+{{- $verbs := .Verbs -}}
+{{- $name := .Name -}}
+{{- with .MainCtx -}}
+
 // Code generated by FTL. DO NOT EDIT.
 package main
 
 import (
-	"context"
-
-{{- range .ExternalTypes }}
-
-	{{.Import}}
-{{- end}}
-
-	"github.com/TBD54566975/ftl/backend/protos/xyz/block/ftl/v1/ftlv1connect"
-	"github.com/TBD54566975/ftl/common/plugin"
-{{- if or .SumTypes .ExternalTypes }}
-	"github.com/TBD54566975/ftl/go-runtime/ftl/reflection"
-{{- end }}
-	"github.com/TBD54566975/ftl/go-runtime/server"
-{{ range mainImports . }}
-	"ftl/{{.}}"
+{{- range .Imports }}
+	{{.}}
 {{- end}}
 )
 {{- if or .SumTypes .ExternalTypes }}
 
 func init() {
 	reflection.Register(
 {{- range .SumTypes}}
-		reflection.SumType[{{.Discriminator}}](
+		reflection.SumType[{{.TypeName}}](
 			{{- range .Variants}}
 			*new({{.Name}}),
 			{{- end}}
 		),
 {{- end}}
 {{- range .ExternalTypes}}
-        {{- range .Types}}
-		reflection.ExternalType(*new({{.}})),
-		{{- end}}
+		reflection.ExternalType(*new({{.TypeName}})),
 {{- end}}
 	)
 }
 {{- end}}
 
 func main() {
-	verbConstructor := server.NewUserVerbServer("{{.ProjectName}}", "{{.Name}}",
-{{- range .Verbs}}
+	verbConstructor := server.NewUserVerbServer("{{.ProjectName}}", "{{$name}}",
+{{- range $verbs }}
 	{{- if and .HasRequest .HasResponse}}
-		server.HandleCall({{.Package}}.{{.Name}}),
+		server.HandleCall({{.TypeName}}),
 	{{- else if .HasRequest}}
-		server.HandleSink({{.Package}}.{{.Name}}),
+		server.HandleSink({{.TypeName}}),
 	{{- else if .HasResponse}}
-		server.HandleSource({{.Package}}.{{.Name}}),
+		server.HandleSource({{.TypeName}}),
 	{{- else}}
-		server.HandleEmpty({{.Package}}.{{.Name}}),
+		server.HandleEmpty({{.TypeName}}),
 	{{- end}}
 {{- end}}
 	)
-	plugin.Start(context.Background(), "{{.Name}}", verbConstructor, ftlv1connect.VerbServiceName, ftlv1connect.NewVerbServiceHandler)
+	plugin.Start(context.Background(), "{{$name}}", verbConstructor, ftlv1connect.VerbServiceName, ftlv1connect.NewVerbServiceHandler)
 }
+{{- end -}}

go-runtime/compile/build-template/types.ftl.go.tmpl

@@ -1,35 +1,33 @@
 {{- $moduleName := .Name -}}
+{{- $verbs := .Verbs -}}
+{{- $name := .Name -}}
+{{- with .TypesCtx -}}
 
 // Code generated by FTL. DO NOT EDIT.
-package {{.Name}}
-
-{{- if or .LocalSumTypes .ExternalTypes }}
+package {{$name}}
 
+{{- if or .SumTypes .ExternalTypes }}
+{{ if .Imports -}}
 import (
-{{- range .ExternalTypes }}
-    {{.Import}}
-{{end}}
-    "github.com/TBD54566975/ftl/go-runtime/ftl/reflection"
-
-{{ range typesImports . }}
-	"{{.}}"
-{{- end}}
+{{- range .Imports }}
+	{{.}}
+{{- end }}
 )
+{{- end }}
 
 func init() {
 	reflection.Register(
-{{- range .LocalSumTypes}}
-		reflection.SumType[{{ trimModuleQualifier $moduleName .Discriminator }}](
+{{- range .SumTypes}}
+		reflection.SumType[{{ trimModuleQualifier $moduleName .TypeName }}](
 			{{- range .Variants}}
 			*new({{ trimModuleQualifier $moduleName .Name }}),
 			{{- end}}
 		),
 {{- end}}
 {{- range .ExternalTypes}}
-        {{- range .Types}}
-		reflection.ExternalType(*new({{.}})),
-        {{- end}}
+		reflection.ExternalType(*new({{.TypeName}})),
 {{- end}}
 	)
 }
-{{- end}}
+{{- end -}}
+{{- end -}}