Rename front matter errors to meta errors

error.go

@@ -2,11 +2,11 @@ package step
 
 // Error enumerates errors common to this package.
 type Error string; const (
-	ErrCircularInheritance     Error = "circular inheritance"
+	ErrCircularInheritance Error = "circular inheritance"
-	ErrFrontMatterMalformed    Error = "front matter is malformed"
+	ErrMetaMalformed       Error = "metadata is malformed"
-	ErrFrontMatterNeverClosed  Error = "front matter is never closed"
+	ErrMetaNeverClosed     Error = "metadata is never closed"
-	ErrFrontMatterDuplicateKey Error = "duplicate key in front matter"
+	ErrMetaDuplicateKey    Error = "duplicate key in front matter"
-	ErrTypeMismatch            Error = "type mismatch"
+	ErrTypeMismatch        Error = "type mismatch"
 )
 
 // Error fulfills the error interface.

meta.go

@@ -27,7 +27,7 @@ func SplitMeta (input string) (Meta, string, error) {
 	input = strings.TrimPrefix(input, frontMatterRule)
 	index := strings.Index(input, "\n" + frontMatterRule + "\n")
 	if index < 0 {
-		return nil, "", ErrFrontMatterNeverClosed
+		return nil, "", ErrMetaNeverClosed
 	}
 	frontMatterRaw := input[:index]
 	body           := input[index + len(frontMatterRule) + 2:]
@@ -48,15 +48,15 @@ func ParseMeta (input string) (Meta, error) {
 		if line == "" { continue }
 		key, value, ok := strings.Cut(line, ":")
 		if !ok {
-			return nil, ErrFrontMatterMalformed
+			return nil, ErrMetaMalformed
 		}
 		key   = strings.ToLower(strings.TrimSpace(key))
 		value = strings.TrimSpace(value)
 		if key == "" {
-			return nil, ErrFrontMatterMalformed
+			return nil, ErrMetaMalformed
 		}
 		if _, exists := meta[key]; exists {
-			return nil, ErrFrontMatterDuplicateKey
+			return nil, ErrMetaDuplicateKey
 		}
 		meta[key] = value
 	}