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enumgen.go
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enumgen.go
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// Program enumgen generates Go enumeration types. It is intended for use with
// the "go generate" tool.
//
// The generator reads a configuration file in YAML format (see gen.Config).
// To generate types, add:
//
// //go:generate -command enumgen go run github.com/creachadair/enumgen@latest
// //go:generate enumgen -config enums.yml -output generated.go
package main
import (
"errors"
"flag"
"log"
"os"
"strings"
"github.com/creachadair/enumgen/gen"
)
var (
configPath = flag.String("config", "", "Configuration file path")
outputPath = flag.String("output", "", "Output file path (required)")
)
func main() {
flag.Parse()
if *outputPath == "" {
log.Fatal("You must specify an -output file path")
}
cfg, err := loadConfig()
if err != nil {
log.Fatalf("Reading config: %v", err)
}
f, err := os.Create(*outputPath)
if err != nil {
log.Fatalf("Output: %v", err)
}
log.Printf("Generating %d enumerations for package %q", len(cfg.Enum), cfg.Package)
if err := errors.Join(cfg.Generate(f), f.Close()); err != nil {
log.Fatalf("Generate: %v", err)
}
}
func loadConfig() (*gen.Config, error) {
if *configPath == "" {
log.Print("Loading configuration from package source")
return gen.LoadPackage()
} else if strings.HasSuffix(*configPath, ".go") {
return gen.ConfigFromGoFile(*configPath)
}
return gen.ConfigFromYAML(*configPath)
}