feat: text/markdown: add GeneratedAt prefix functions for markdown times

Author: grokify

text/markdown/times.go

@@ -0,0 +1,43 @@
+package markdown
+
+import (
+	"time"
+
+	"github.com/grokify/mogo/time/timeutil"
+)
+
+func GeneratedAtLocationStringsHuman(dt time.Time, locNames []string) (string, error) {
+	return GeneratedAtLocationStrings(timeutil.HumanDateTime, dt, locNames)
+}
+
+func GeneratedAtLocationStrings(layout string, dt time.Time, locNames []string) (string, error) {
+	locs := []*time.Location{}
+	for _, locStr := range locNames {
+		if loc, err := time.LoadLocation(locStr); err != nil {
+			return "", err
+		} else if loc != nil {
+			locs = append(locs, loc)
+		}
+	}
+	return GeneratedAt(layout, dt, locs), nil
+}
+
+func GeneratedAt(layout string, dt time.Time, locs []*time.Location) string {
+	prefix := "Generated at"
+	if len(locs) == 0 {
+		return prefix + " " + dt.Format(layout)
+	} else if len(locs) == 1 {
+		if locs[0] != nil {
+			dt = dt.In(locs[0])
+		}
+		return prefix + " " + dt.Format(layout)
+	}
+	str := prefix + "\n"
+	for _, loc := range locs {
+		if loc != nil {
+			dt = dt.In(loc)
+		}
+		str += "* " + dt.Format(layout) + "\n"
+	}
+	return str
+}