UPDATE: partial revert for ordered frontmatter keys

Author: fileformat

go.mod

@@ -29,6 +29,7 @@ require (
 	github.com/BurntSushi/toml v1.2.1 // indirect
 	github.com/VividCortex/ewma v1.1.1 // indirect
 	github.com/antchfx/xpath v1.2.0 // indirect
+	github.com/cevaris/ordered_map v0.0.0-20220813181356-34664b69742b // indirect
 	github.com/cpuguy83/go-md2man/v2 v2.0.2 // indirect
 	github.com/fatih/color v1.13.0 // indirect
 	github.com/golang/groupcache v0.0.0-20210331224755-41bb18bfe9da // indirect

go.sum

@@ -14,6 +14,8 @@ github.com/antchfx/xpath v1.2.0 h1:mbwv7co+x0RwgeGAOHdrKy89GvHaGvxxBtPK0uF9Zr8=
 github.com/antchfx/xpath v1.2.0/go.mod h1:i54GszH55fYfBmoZXapTHN8T8tkcHfRgLyVwwqzXNcs=
 github.com/bmatcuk/doublestar/v4 v4.0.2 h1:X0krlUVAVmtr2cRoTqR8aDMrDqnB36ht8wpWTiQ3jsA=
 github.com/bmatcuk/doublestar/v4 v4.0.2/go.mod h1:xBQ8jztBU6kakFMg+8WGxn0c6z1fTSPVIjEY1Wr7jzc=
+github.com/cevaris/ordered_map v0.0.0-20220813181356-34664b69742b h1:3G9nSrTyBZcQMI9phQK1XvSDCb8E6b1+6E5dcr+R2MU=
+github.com/cevaris/ordered_map v0.0.0-20220813181356-34664b69742b/go.mod h1:dcE/RHCVM8522lLVHLcdgxCuQEYE5Zhn6VPXcxALaNs=
 github.com/cheggaaa/pb/v3 v3.0.8 h1:bC8oemdChbke2FHIIGy9mn4DPJ2caZYQnfbRqwmdCoA=
 github.com/cheggaaa/pb/v3 v3.0.8/go.mod h1:UICbiLec/XO6Hw6k+BHEtHeQFzzBH4i2/qk/ow1EJTA=
 github.com/cpuguy83/go-md2man/v2 v2.0.2 h1:p1EgwI/C7NhT0JmVkwCD2ZBK8j4aeHQX2pMHHBfMQ6w=

internal/command/frontmatter.go

@@ -8,6 +8,7 @@ import (
 	"github.com/FileFormatInfo/fflint/internal/shared"
 	"github.com/adrg/frontmatter"
 	"github.com/spf13/cobra"
+	yamlv2 "gopkg.in/yaml.v2"
 	"gopkg.in/yaml.v3"
 )
 
@@ -68,7 +69,7 @@ func frontmatterCheck(f *shared.FileContext) {
 		}
 	}
 
-	yamlRawData := make(map[string]any)
+	yamlRawData := make(map[any]any)
 	//LATER: maybe flag to require contents?
 	_, parseErr := frontmatter.MustParse(bytes.NewReader(data), &yamlRawData, formats...)
 
@@ -116,8 +117,19 @@ func frontmatterCheck(f *shared.FileContext) {
 	}
 
 	if fmSorted {
+		sortedData := yamlv2.MapSlice{}
+
+		frontmatter.Parse(bytes.NewReader(data), &sortedData)
 		previousKey := ""
-		for currentKey := range yamlData {
+		for _, item := range sortedData {
+			currentKey, strErr := item.Key.(string)
+			if !strErr {
+				f.RecordResult("frontmatterSortedParse", false, map[string]interface{}{
+					"err": "key is not a string",
+					"key": fmt.Sprintf("%v", item.Key),
+				})
+				continue
+			}
 			f.RecordResult("frontmatterSorted", previousKey < currentKey, map[string]interface{}{
 				"previous": previousKey,
 				"current":  currentKey,