Uses custom date format YYYY-MM-DD

Fix #106

internal/meta/meta.go

@@ -4,6 +4,7 @@ package meta
 
 import (
 	"os/user"
+	"strings"
 
 	"gopkg.in/yaml.v2"
 )
@@ -65,7 +66,7 @@ func (m *Meta) Parse(header string) (*Meta, bool) {
 	}
 
 	if tmp.Date != nil {
-		m.Date = *tmp.Date
+		m.Date = parseDate(*tmp.Date)
 	} else {
 		m.Date = fallback.Date
 	}
@@ -99,3 +100,21 @@ func defaultDate() string {
 func defaultPaging() string {
 	return "Slide %d / %d"
 }
+
+func parseDate(value string) string {
+	pairs := [][]string{
+		{"YYYY", "2006"},
+		{"YY", "06"},
+		{"MMMM", "January"},
+		{"MMM", "Jan"},
+		{"MM", "01"},
+		{"mm", "1"},
+		{"DD", "02"},
+		{"dd", "2"},
+	}
+
+	for _, p := range pairs {
+		value = strings.ReplaceAll(value, p[0], p[1])
+	}
+	return value
+}

internal/meta/meta_test.go

@@ -59,7 +59,7 @@ func TestMeta_ParseHeader(t *testing.T) {
 			},
 		},
 		{
-			name:      "Parse date from header",
+			name:      "Parse static date from header",
 			slideshow: fmt.Sprintf("---\ndate: %q\n", "31/01/1970"),
 			want: &meta.Meta{
 				Theme:  "default",
@@ -68,6 +68,56 @@ func TestMeta_ParseHeader(t *testing.T) {
 				Paging: "Slide %d / %d",
 			},
 		},
+		{
+			name:      "Parse go-styled date from header",
+			slideshow: fmt.Sprintf("---\ndate: %q\n", "Jan 2, 2006"),
+			want: &meta.Meta{
+				Theme:  "default",
+				Author: user.Name,
+				Date:   "Jan 2, 2006",
+				Paging: "Slide %d / %d",
+			},
+		},
+		{
+			name:      "Parse YYYY-MM-DD date from header",
+			slideshow: fmt.Sprintf("---\ndate: %q\n", "YYYY-MM-DD"),
+			want: &meta.Meta{
+				Theme:  "default",
+				Author: user.Name,
+				Date:   "2006-01-02",
+				Paging: "Slide %d / %d",
+			},
+		},
+		{
+			name:      "Parse dd/mm/YY date from header",
+			slideshow: fmt.Sprintf("---\ndate: %q\n", "dd/mm/YY"),
+			want: &meta.Meta{
+				Theme:  "default",
+				Author: user.Name,
+				Date:   "2/1/06",
+				Paging: "Slide %d / %d",
+			},
+		},
+		{
+			name:      "Parse MMM dd, YYYY date from header",
+			slideshow: fmt.Sprintf("---\ndate: %q\n", "MMM dd, YYYY"),
+			want: &meta.Meta{
+				Theme:  "default",
+				Author: user.Name,
+				Date:   "Jan 2, 2006",
+				Paging: "Slide %d / %d",
+			},
+		},
+		{
+			name:      "Parse MMMM DD, YYYY date from header",
+			slideshow: fmt.Sprintf("---\ndate: %q\n", "MMMM DD, YYYY"),
+			want: &meta.Meta{
+				Theme:  "default",
+				Author: user.Name,
+				Date:   "January 02, 2006",
+				Paging: "Slide %d / %d",
+			},
+		},
 		{
 			name:      "Fallback to default if no date provided",
 			slideshow: "\n# Header Slide\n > Subtitle\n",