[recipes/shopping-list: 1/15] Add a function to format time differences

[Matthias Clasen <matthiasc src gnome org>]

commit 16a5cf28e95b41d773ba44945f36cc39e2e19e6d
Author: Matthias Clasen <mclasen redhat com>
Date:   Sat Jan 7 00:17:47 2017 -0500

    Add a function to format time differences
    
    This does a fuzzy "some time ago" style translation.

 src/gr-utils.c |   44 ++++++++++++++++++++++++++++++++++++++++++++
 src/gr-utils.h |    1 +
 2 files changed, 45 insertions(+), 0 deletions(-)
---
diff --git a/src/gr-utils.c b/src/gr-utils.c
index f4ef27f..8051c19 100644
--- a/src/gr-utils.c
+++ b/src/gr-utils.c
@@ -382,3 +382,47 @@ stop_recording (void)
         start_time = 0;
 }
 
+char *
+format_date_time_difference (GDateTime *end,
+                             GDateTime *start)
+{
+        int y1, m1, d1, y2, m2, d2, delta;
+        GTimeSpan span;
+        int i;
+
+        span = g_date_time_difference (end, start);
+        g_date_time_get_ymd (start, &y1, &m1, &d1);
+        g_date_time_get_ymd (end, &y2, &m2, &d2);
+
+        if (y1 + 1 < y2)
+                return g_strdup_printf (_("more than a year ago"));
+        else if (y1 < y2) {
+                delta = 12 - m1 + m2;
+                return g_strdup_printf (ngettext ("%d month ago", "%d months ago", delta), delta);
+        }
+        else if (m1 < m2) {
+                delta = m2 - m1;
+                return g_strdup_printf (ngettext ("%d month ago", "%d months ago", delta), delta);
+        }
+        else if (d1 < d2) {
+                delta = d2 - d1;
+                return g_strdup_printf (ngettext ("%d day ago", "%d days ago", delta), delta);
+        }
+        else if (span < 5 * G_TIME_SPAN_MINUTE)
+                return g_strdup_printf (_("just now"));
+        else if (span < 15 * G_TIME_SPAN_MINUTE)
+                return g_strdup_printf (_("10 minutes ago"));
+        else if (span < 45 * G_TIME_SPAN_MINUTE)
+                return g_strdup_printf (_("half an hour ago"));
+        else {
+                for (i = 1; i < 23; i++) {
+                        if (span < i * G_TIME_SPAN_HOUR + 30 * G_TIME_SPAN_MINUTE) {
+                                return g_strdup_printf (ngettext ("%d hour ago", "%d hours ago", i), i);
+                                break;
+                        }
+                }
+        }
+
+        return _("some time ago");
+}
+
diff --git a/src/gr-utils.h b/src/gr-utils.h
index 126b66f..4ae30b4 100644
--- a/src/gr-utils.h
+++ b/src/gr-utils.h
@@ -44,6 +44,7 @@ void gr_utils_widget_set_css_simple (GtkWidget  *widget,
 
 char      * date_time_to_string   (GDateTime *dt);
 GDateTime * date_time_from_string (const char *string);
+char      * format_date_time_difference (GDateTime *end, GDateTime *start);
 
 gboolean skip_whitespace (char **input);
 gboolean space_or_nul    (char p);