grafana/pkg/codegen/generators.go

55 lines
1.4 KiB
Go

package codegen
import (
"bytes"
"fmt"
"path/filepath"
"cuelang.org/go/cue"
"github.com/grafana/codejen"
)
type OneToOne codejen.OneToOne[SchemaForGen]
type OneToMany codejen.OneToMany[SchemaForGen]
type ManyToOne codejen.ManyToOne[SchemaForGen]
type ManyToMany codejen.ManyToMany[SchemaForGen]
// SlashHeaderMapper produces a FileMapper that injects a comment header onto
// a [codejen.File] indicating the main generator that produced it (via the provided
// maingen, which should be a path) and the jenny or jennies that constructed the
// file.
func SlashHeaderMapper(maingen string) codejen.FileMapper {
return func(f codejen.File) (codejen.File, error) {
var leader string
// Never inject on certain filetypes, it's never valid
switch filepath.Ext(f.RelativePath) {
case ".json", ".md":
return f, nil
case ".yml", ".yaml":
leader = "#"
default:
leader = "//"
}
buf := new(bytes.Buffer)
if err := tmpls.Lookup("gen_header.tmpl").Execute(buf, tvars_gen_header{
MainGenerator: filepath.ToSlash(maingen),
Using: f.From,
Leader: leader,
}); err != nil {
return codejen.File{}, fmt.Errorf("failed executing gen header template: %w", err)
}
fmt.Fprint(buf, string(f.Data))
f.Data = buf.Bytes()
return f, nil
}
}
type SchemaForGen struct {
Name string
CueFile cue.Value
FilePath string
IsGroup bool
OutputName string // Some TS output files are capitalised and others not.
}