1 files changed, 62 insertions, 0 deletions
diff --git a/duration/duration.go b/duration/duration.go
new file mode 100644
index 0000000..b31d139
--- /dev/null
+++ b/duration/duration.go
@@ -0,0 +1,62 @@
+// Copyright (c) 2017 Hervé Gouchet. All rights reserved.
+// Use of this source code is governed by the MIT License
+// that can be found in the LICENSE file.
+
+package duration
+
+import (
+	"math"
+	"time"
+
+	"github.com/miniflux/miniflux/locale"
+)
+
+// Texts to be translated if necessary.
+var (
+	NotYet     = `not yet`
+	JustNow    = `just now`
+	LastMinute = `1 minute ago`
+	Minutes    = `%d minutes ago`
+	LastHour   = `1 hour ago`
+	Hours      = `%d hours ago`
+	Yesterday  = `yesterday`
+	Days       = `%d days ago`
+	Weeks      = `%d weeks ago`
+	Months     = `%d months ago`
+	Years      = `%d years ago`
+)
+
+// ElapsedTime returns in a human readable format the elapsed time
+// since the given datetime.
+func ElapsedTime(translator *locale.Language, t time.Time) string {
+	if t.IsZero() || time.Now().Before(t) {
+		return translator.Get(NotYet)
+	}
+	diff := time.Since(t)
+	// Duration in seconds
+	s := diff.Seconds()
+	// Duration in days
+	d := int(s / 86400)
+	switch {
+	case s < 60:
+		return translator.Get(JustNow)
+	case s < 120:
+		return translator.Get(LastMinute)
+	case s < 3600:
+		return translator.Get(Minutes, int(diff.Minutes()))
+	case s < 7200:
+		return translator.Get(LastHour)
+	case s < 86400:
+		return translator.Get(Hours, int(diff.Hours()))
+	case d == 1:
+		return translator.Get(Yesterday)
+	case d < 7:
+		return translator.Get(Days, d)
+	case d < 31:
+		return translator.Get(Weeks, int(math.Ceil(float64(d)/7)))
+	case d < 365:
+		return translator.Get(Months, int(math.Ceil(float64(d)/30)))
+	default:
+		return translator.Get(Years, int(math.Ceil(float64(d)/365)))
+	}
+}