format output with hujsonfmt

Makefile

@@ -4,5 +4,5 @@ testdata:
 		-v \
 		-f testdata/input-parent.hujson \
 		-d testdata/departments/ \
-		-o testdata/output-file-to-compare-to.hujson \
-		-allow=acls,autoApprovers,grants,groups,ipsets,ssh,tests,sshTests
+		-allow=acls,autoApprovers,grants,groups,ipsets,ssh,tests,sshTests \
+		-o testdata/output-file-to-compare-to.hujson

go.mod

@@ -1,9 +1,13 @@
 module github.com/tailscale-dev/tailscale-acl-combiner
 
-go 1.21
+go 1.23
+
+toolchain go1.23.10
 
 require github.com/creachadair/jtree v0.0.0-20231211041502-6ba355703cad
 
+require github.com/tailscale/hujson v0.0.0-20250605163823-992244df8c5a
+
 require (
 	go4.org/mem v0.0.0-20220726221520-4f986261bf13 // indirect
 	golang.org/x/exp v0.0.0-20230728194245-b0cb94b80691 // indirect

go.sum

@@ -2,8 +2,8 @@ github.com/creachadair/jtree v0.0.0-20231211041502-6ba355703cad h1:2MMMgC7ORRjJH
 github.com/creachadair/jtree v0.0.0-20231211041502-6ba355703cad/go.mod h1:WP8iLZIRvdwzYE3ahHTQVJa3AvAjQLnSUHl/IfXPzeQ=
 github.com/google/go-cmp v0.5.9 h1:O2Tfq5qg4qc4AmwVlvv0oLiVAGB7enBSJ2x2DqQFi38=
 github.com/google/go-cmp v0.5.9/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
-github.com/tailscale/hujson v0.0.0-20221223112325-20486734a56a h1:SJy1Pu0eH1C29XwJucQo73FrleVK6t4kYz4NVhp34Yw=
-github.com/tailscale/hujson v0.0.0-20221223112325-20486734a56a/go.mod h1:DFSS3NAGHthKo1gTlmEcSBiZrRJXi28rLNd/1udP1c8=
+github.com/tailscale/hujson v0.0.0-20250605163823-992244df8c5a h1:a6TNDN9CgG+cYjaeN8l2mc4kSz2iMiCDQxPEyltUV/I=
+github.com/tailscale/hujson v0.0.0-20250605163823-992244df8c5a/go.mod h1:EbW0wDK/qEUYI0A5bqq0C2kF8JTQwWONmGDBbzsxxHo=
 go4.org/mem v0.0.0-20220726221520-4f986261bf13 h1:CbZeCBZ0aZj8EfVgnqQcYZgf0lpZ3H9rmp5nkDTAst8=
 go4.org/mem v0.0.0-20220726221520-4f986261bf13/go.mod h1:reUoABIJ9ikfM5sgtSF3Wushcza7+WeD01VB9Lirh3g=
 golang.org/x/exp v0.0.0-20230728194245-b0cb94b80691 h1:/yRP+0AN7mf5DkD3BAI6TOFnd51gEoDEb8o35jIFtgw=

main.go

@@ -13,6 +13,7 @@ import (
 
 	"github.com/creachadair/jtree/ast"
 	"github.com/creachadair/jtree/jwcc"
+	"github.com/tailscale/hujson"
 )
 
 var (
@@ -304,6 +305,17 @@ func gatherChildren(path string) ([]*ParsedDocument, error) {
 }
 
 func outputFile(doc *jwcc.Object) error {
+	var sb strings.Builder
+	err := jwcc.Format(&sb, doc)
+	if err != nil {
+		return err
+	}
+
+	formatted, err := hujson.Format([]byte(sb.String()))
+	if err != nil {
+		return err
+	}
+
 	if *outFile != "" {
 		f, err := os.Create(*outFile)
 		if err != nil {
@@ -312,18 +324,10 @@ func outputFile(doc *jwcc.Object) error {
 		defer f.Close()
 
 		w := bufio.NewWriter(f)
-		err = jwcc.Format(w, doc)
-		if err != nil {
-			return err
-		}
-		w.WriteString("\n")
+		w.Write(formatted)
 		w.Flush()
 	} else {
-		err := jwcc.Format(os.Stdout, doc)
-		if err != nil {
-			return err
-		}
-		fmt.Printf("\n")
+		fmt.Print(string(formatted))
 	}
 	return nil
 }