Split ParseMeta out of SplitMeta

meta.go

@@ -12,8 +12,11 @@ type Meta = map[string] string
 // along with the rest of the input as a string. If there is no metadata, an
 // empty map will be returned.
 func SplitMeta (input string) (Meta, string, error) {
-	// i hate crlf!!!!! uwehhh!!!
+	// i hate crlf!!!!! uwehhh!!! TODO remove
 	input = strings.ReplaceAll(input, "\r\n", "\n")
+	// TODO call internal function that takes in an io.Reader and scans it
+	// by line instead of operating directly on the string. have that call
+	// yet another function which will solve #11
 	
 	// stop if there is no front matter
 	if !strings.HasPrefix(input, frontMatterRule + "\n") {
@@ -28,26 +31,34 @@ func SplitMeta (input string) (Meta, string, error) {
 	}
 	frontMatterRaw := input[:index]
 	body           := input[index + len(frontMatterRule) + 2:]
-	frontMatter    := make(Meta)
 
-	// iterate over the lines
-	for _, line := range strings.Split(frontMatterRaw, "\n") {
+	// parse meta
+	meta, err := ParseMeta(frontMatterRaw)
+	if err != nil { return Meta { }, "", err }
+	
+	return meta, body, nil
+}
+
+// ParseMeta parses isolated metadata (without the horizontal starting and
+// ending rules).
+func ParseMeta (input string) (Meta, error) {
+	meta := make(Meta)
+	for _, line := range strings.Split(input, "\n") {
 		line = strings.TrimSpace(line)
 		if line == "" { continue }
 		key, value, ok := strings.Cut(line, ":")
 		if !ok {
-			return nil, "", ErrFrontMatterMalformed
+			return nil, ErrFrontMatterMalformed
 		}
 		key   = strings.ToLower(strings.TrimSpace(key))
 		value = strings.TrimSpace(value)
 		if key == "" {
-			return nil, "", ErrFrontMatterMalformed
+			return nil, ErrFrontMatterMalformed
 		}
-		if _, exists := frontMatter[key]; exists {
-			return nil, "", ErrFrontMatterDuplicateKey
+		if _, exists := meta[key]; exists {
+			return nil, ErrFrontMatterDuplicateKey
 		}
-		frontMatter[key] = value
+		meta[key] = value
 	}
-	
-	return frontMatter, body, nil
+	return meta, nil
 }