1 files changed, 44 insertions, 0 deletions
diff --git a/src/post/format.go b/src/post/format.go
new file mode 100644
index 0000000..21ef79f
--- /dev/null
+++ b/src/post/format.go
@@ -0,0 +1,44 @@
+package post
+
+import "errors"
+
+// ErrFormatStringMalformed indicates that a string could not be converted to a
+// Format.
+var ErrFormatStringMalformed = errors.New("format string malformed")
+
+// Format describes the format of the body of a Post.
+type Format string
+
+// Enumeration of possible formats.
+const (
+	FormatMarkdown Format = "md"
+	FormatGemtext  Format = "gmi"
+)
+
+// Formats slice of all possible Formats.
+var Formats = []Format{
+	FormatMarkdown,
+	FormatGemtext,
+}
+
+var strsToFormats = func() map[string]Format {
+
+	m := map[string]Format{}
+
+	for _, f := range Formats {
+		m[string(f)] = f
+	}
+
+	return m
+}()
+
+// FormatFromString parses a string into a Format, or returns
+// ErrFormatStringMalformed.
+func FormatFromString(str string) (Format, error) {
+
+	if f, ok := strsToFormats[str]; ok {
+		return f, nil
+	}
+
+	return "", ErrFormatStringMalformed
+}