Initial import from PoC

.gitignore

@@ -0,0 +1 @@
+/generated

cue.mod/module.cue

@@ -0,0 +1 @@
+module: "github.com/grafana/cog"

go.mod

@@ -0,0 +1,52 @@
+module github.com/grafana/cog
+
+go 1.21
+
+require (
+	cuelang.org/go v0.5.0
+	github.com/grafana/codejen v0.0.4-0.20221122220907-a5e7cc5407b3
+	github.com/grafana/kindsys v0.0.0-20230615185749-1424263c17c7
+	github.com/grafana/thema v0.0.0-20230628103417-8f63313207a5
+	github.com/santhosh-tekuri/jsonschema v1.2.4
+	github.com/yalue/merged_fs v1.2.2
+	golang.org/x/text v0.10.0
+	golang.org/x/tools v0.10.0
+)
+
+require (
+	github.com/cockroachdb/apd/v2 v2.0.2 // indirect
+	github.com/cockroachdb/errors v1.10.0 // indirect
+	github.com/cockroachdb/logtags v0.0.0-20230118201751-21c54148d20b // indirect
+	github.com/cockroachdb/redact v1.1.5 // indirect
+	github.com/emicklei/proto v1.11.2 // indirect
+	github.com/getsentry/sentry-go v0.22.0 // indirect
+	github.com/gogo/protobuf v1.3.2 // indirect
+	github.com/google/go-cmp v0.5.9 // indirect
+	github.com/google/uuid v1.3.0 // indirect
+	github.com/hashicorp/errwrap v1.1.0 // indirect
+	github.com/hashicorp/go-multierror v1.1.1 // indirect
+	github.com/kr/pretty v0.3.1 // indirect
+	github.com/kr/text v0.2.0 // indirect
+	github.com/lib/pq v1.10.6 // indirect
+	github.com/mitchellh/go-wordwrap v1.0.1 // indirect
+	github.com/mpvl/unique v0.0.0-20150818121801-cbe035fff7de // indirect
+	github.com/pkg/errors v0.9.1 // indirect
+	github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2 // indirect
+	github.com/protocolbuffers/txtpbfmt v0.0.0-20230412060525-fa9f017c0ded // indirect
+	github.com/rogpeppe/go-internal v1.10.0 // indirect
+	golang.org/x/mod v0.11.0 // indirect
+	golang.org/x/net v0.11.0 // indirect
+	golang.org/x/sync v0.3.0 // indirect
+	golang.org/x/sys v0.9.0 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+)
+
+// replace github.com/grafana/grafana => ../grafana
+
+// replace github.com/grafana/codejen => ../codejen
+
+// replace github.com/grafana/thema => ../thema
+
+replace cuelang.org/go => github.com/sdboyer/cue v0.5.0-beta.2.0.20221218111347-341999f48bdb
+
+replace github.com/deepmap/oapi-codegen => github.com/spinillos/oapi-codegen v1.12.5-0.20230417081915-2945b61c0b1c

go.sum

@@ -0,0 +1,113 @@
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+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

internal/ast/builder.go

@@ -0,0 +1,145 @@
+package ast
+
+type Builder struct {
+	Package         string
+	For             Object
+	Options         []Option
+	Initializations []Assignment
+}
+
+type Builders []Builder
+
+func (builders Builders) LocateByObject(pkg string, name string) (Builder, bool) {
+	for _, builder := range builders {
+		if builder.Package == pkg && builder.For.Name == name {
+			return builder, true
+		}
+	}
+
+	return Builder{}, false
+}
+
+type Option struct {
+	Name             string
+	Comments         []string
+	Args             []Argument
+	Assignments      []Assignment
+	Default          *OptionDefault
+	IsConstructorArg bool
+}
+
+type OptionDefault struct {
+	ArgsValues []any
+}
+
+type Argument struct {
+	Name string
+	Type Type
+}
+
+type Assignment struct {
+	// Where
+	Path string
+
+	// What
+	ValueType    Type   // type of the value being assigned
+	ArgumentName string // if empty, then use `Value`
+	Value        any
+
+	Constraints []TypeConstraint
+
+	// Some more context on the what
+	IntoOptionalField bool
+}
+
+type BuilderGenerator struct {
+}
+
+func (generator *BuilderGenerator) FromAST(files []*File) []Builder {
+	builders := make([]Builder, 0, len(files))
+
+	for _, file := range files {
+		for _, object := range file.Definitions {
+			// we only want builders for structs
+			if object.Type.Kind() != KindStruct {
+				continue
+			}
+
+			builders = append(builders, generator.structObjectToBuilder(file, object))
+		}
+	}
+
+	return builders
+}
+
+func (generator *BuilderGenerator) structObjectToBuilder(file *File, object Object) Builder {
+	builder := Builder{
+		Package: file.Package,
+		For:     object,
+		Options: nil,
+	}
+	structType := object.Type.(StructType)
+
+	for _, field := range structType.Fields {
+		if generator.fieldHasStaticValue(field) {
+			builder.Initializations = append(builder.Initializations, generator.structFieldToStaticInitialization(field))
+			continue
+		}
+
+		builder.Options = append(builder.Options, generator.structFieldToOption(field))
+	}
+
+	return builder
+}
+
+func (generator *BuilderGenerator) fieldHasStaticValue(field StructField) bool {
+	scalarType, ok := field.Type.(ScalarType)
+
+	return ok && scalarType.Value != nil
+}
+
+func (generator *BuilderGenerator) structFieldToStaticInitialization(field StructField) Assignment {
+	scalarType, _ := field.Type.(ScalarType)
+
+	return Assignment{
+		Path:              field.Name,
+		Value:             scalarType.Value,
+		ValueType:         field.Type,
+		IntoOptionalField: !field.Required,
+	}
+}
+
+func (generator *BuilderGenerator) structFieldToOption(field StructField) Option {
+	var constraints []TypeConstraint
+	if scalarType, ok := field.Type.(ScalarType); ok {
+		constraints = scalarType.Constraints
+	}
+
+	opt := Option{
+		Name:     field.Name,
+		Comments: field.Comments,
+		Args: []Argument{
+			{
+				Name: field.Name,
+				Type: field.Type,
+			},
+		},
+		Assignments: []Assignment{
+			{
+				Path:              field.Name,
+				ArgumentName:      field.Name,
+				ValueType:         field.Type,
+				Constraints:       constraints,
+				IntoOptionalField: !field.Required,
+			},
+		},
+	}
+
+	if field.Default != nil {
+		opt.Default = &OptionDefault{
+			ArgsValues: []any{field.Default},
+		}
+	}
+
+	return opt
+}