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njson.go
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njson.go
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package main
import (
"fmt"
"io"
"log"
"os"
"path"
"path/filepath"
"regexp"
"strings"
"flag"
"github.com/alxarch/njson/internal/generator"
)
var (
targetPath = flag.String("p", ".", "Path to scan for .go files.")
tagKey = flag.String("k", "json", "Struct tag key.")
onlyTagged = flag.Bool("only-tagged", false, "Only use tagged fields.")
onlyExported = flag.Bool("only-exported", false, "Only use exported fields.")
// allStructs = flag.Bool("all", false, "Generate methods for all defined structs in package.")
forceOmitEmpty = flag.Bool("omitempty", false, "Force omitempty on all fields.")
generateAppend = flag.Bool("append", false, "Generate AppendJSON methods.")
generateUnmarshal = flag.Bool("unmarshal", false, "Generate UnmarshalNodeJSON methods.")
matchFieldNames = flag.String("match", ".*", "Regex for filtering by field name.")
caseTransform = flag.String("case", "none", "Field name case transformation for untagged fields (none|snake|camel|lower).")
writeFile = flag.Bool("w", false, `Write output to a file named "{pkgname}_njson.go".`)
debug = flag.Bool("d", false, "Debug mode.")
// tests = flag.Bool("tests", false, "Write test methods.")
)
func init() {
flag.Usage = func() {
fmt.Fprintf(flag.CommandLine.Output(), "Usage of %s [pkg] [type...]:\n", os.Args[0])
flag.PrintDefaults()
}
}
func main() {
flag.Parse()
logger := log.New(os.Stderr, "njson: ", log.LstdFlags)
targetPkg := flag.Arg(0)
if targetPkg == "" {
absPath, err := filepath.Abs(*targetPath)
if err != nil {
logger.Fatalf("Failed to resolve path %q: %s", *targetPath, err)
}
targetPkg = path.Base(absPath)
targetPkg = strings.TrimSuffix(targetPkg, path.Ext(targetPkg))
}
var options []generator.Option
options = append(options, generator.Logger(logger))
options = append(options, generator.TagKey(*tagKey))
if *forceOmitEmpty {
options = append(options, generator.ForceOmitEmpty(true))
}
if *onlyExported {
options = append(options, generator.OnlyExported(true))
}
if *onlyTagged {
options = append(options, generator.OnlyTagged(true))
}
if *caseTransform != "none" {
options = append(options, generator.TransformFieldCase(*caseTransform))
}
if *matchFieldNames != ".*" {
rx, err := regexp.Compile(*matchFieldNames)
if err != nil {
log.Fatalf("Invalid match field name regexp: %s", err)
}
options = append(options, generator.MatchFieldName(rx))
}
if *generateAppend == *generateUnmarshal {
*generateAppend = true
*generateUnmarshal = true
}
g, err := generator.NewFromDir(*targetPath, targetPkg, options...)
if err != nil {
logger.Fatal(err)
}
typeFilter := func(string) bool { return true }
switch match := flag.Arg(1); match {
case "", "*":
default:
if regexp.QuoteMeta(match) == match {
// match is not regexp
typeFilter = func(name string) bool { return name == match }
} else if rx, err := regexp.Compile(match); err != nil {
logger.Fatalln("Failed to compile match regex", err)
} else {
typeFilter = rx.MatchString
}
}
types := []string{}
for _, t := range g.AllStructs() {
if typeFilter(t) {
types = append(types, t)
}
}
if len(types) == 0 {
logger.Fatalf("No types found")
}
g.Reset()
var t *generator.Generator
// if *tests {
// t = g.Test()
// t.Reset()
// }
for _, typ := range types {
if *generateUnmarshal {
if err := g.WriteUnmarshaler(typ); err != nil {
logger.Fatal(err)
}
}
if *generateAppend {
if err := g.WriteAppender(typ); err != nil {
logger.Fatal(err)
}
}
// if t != nil {
// if err := t.WriteUnmarshalerTest(typ); err != nil {
// logger.Fatal(err)
// }
// }
}
if *debug {
g.DumpTo(os.Stderr)
if t != nil {
t.DumpTo(os.Stderr)
}
return
}
var out io.Writer = os.Stdout
// var tout io.Writer = os.Stderr
if *writeFile {
filename := g.Filename()
filename = filepath.Join(*targetPath, filename)
f, err := os.Create(filename)
defer f.Close()
if err != nil {
logger.Fatalf("Failed to open file %q for writing: %s", filename, err)
}
out = f
// if t != nil && t != g {
// filename := t.Filename()
// filename = filepath.Join(*targetPath, filename)
// f, err := os.Create(filename)
// defer f.Close()
// if err != nil {
// logger.Fatalf("Failed to open file %q for writing: %s", filename, err)
// }
// tout = f
// }
}
if err := g.PrintTo(out); err != nil {
logger.Fatalf("Failed to write output: %s", err)
}
// if t != nil && t != g {
// if err := t.PrintTo(tout); err != nil {
// logger.Fatalf("Failed to write tests: %s", err)
// }
// }
}