[evolution] Add weekday conversion functions.

[Matthew Barnes <mbarnes src gnome org>]

commit 494c98c7642acb7ca678c57678ce104da14c62a8
Author: Matthew Barnes <mbarnes redhat com>
Date:   Fri Mar 8 12:39:27 2013 -0500

    Add weekday conversion functions.
    
    e_weekday_to_tm_wday()
    e_weekday_from_tm_wday()

 doc/reference/libeutil/Makefile.am           |    3 +
 doc/reference/libeutil/libeutil-sections.txt |    2 +
 e-util/e-misc-utils.c                        |   86 ++++++++++++++++++++++++++
 e-util/e-misc-utils.h                        |    2 +
 4 files changed, 93 insertions(+), 0 deletions(-)
---
diff --git a/doc/reference/libeutil/Makefile.am b/doc/reference/libeutil/Makefile.am
index 7fee929..411f0c8 100644
--- a/doc/reference/libeutil/Makefile.am
+++ b/doc/reference/libeutil/Makefile.am
@@ -62,6 +62,9 @@ GTKDOC_LIBS =                                                 \
        $(GTKHTML_LIBS)                                 \
        $(NULL)
 
+# Extra options to supply to gtkdoc-mkdb
+MKDB_OPTIONS = --output-format=xml --sgml-mode
+
 # This includes the standard gtk-doc make rules, copied by gtkdocize.
 include $(top_srcdir)/gtk-doc.make
 
diff --git a/doc/reference/libeutil/libeutil-sections.txt b/doc/reference/libeutil/libeutil-sections.txt
index 4934a95..57ccb96 100644
--- a/doc/reference/libeutil/libeutil-sections.txt
+++ b/doc/reference/libeutil/libeutil-sections.txt
@@ -2252,6 +2252,8 @@ e_weekday_get_prev
 e_weekday_add_days
 e_weekday_subtract_days
 e_weekday_get_days_between
+e_weekday_to_tm_wday
+e_weekday_from_tm_wday
 e_flexible_strtod
 E_ASCII_DTOSTR_BUF_SIZE
 e_ascii_dtostr
diff --git a/e-util/e-misc-utils.c b/e-util/e-misc-utils.c
index 60ebc6b..0f35099 100644
--- a/e-util/e-misc-utils.c
+++ b/e-util/e-misc-utils.c
@@ -1648,6 +1648,92 @@ e_weekday_get_days_between (GDateWeekday weekday1,
        return n_days;
 }
 
+/**
+ * e_weekday_to_tm_wday:
+ * @weekday: a #GDateWeekday
+ *
+ * Converts a #GDateWeekday to the numbering used in
+ * <structname>struct tm</structname>.
+ *
+ * Returns: number of days since Sunday (0 - 6)
+ **/
+gint
+e_weekday_to_tm_wday (GDateWeekday weekday)
+{
+       gint tm_wday;
+
+       switch (weekday) {
+               case G_DATE_MONDAY:
+                       tm_wday = 1;
+                       break;
+               case G_DATE_TUESDAY:
+                       tm_wday = 2;
+                       break;
+               case G_DATE_WEDNESDAY:
+                       tm_wday = 3;
+                       break;
+               case G_DATE_THURSDAY:
+                       tm_wday = 4;
+                       break;
+               case G_DATE_FRIDAY:
+                       tm_wday = 5;
+                       break;
+               case G_DATE_SATURDAY:
+                       tm_wday = 6;
+                       break;
+               case G_DATE_SUNDAY:
+                       tm_wday = 0;
+                       break;
+               default:
+                       g_return_val_if_reached (-1);
+       }
+
+       return tm_wday;
+}
+
+/**
+ * e_weekday_from_tm_wday:
+ * @tm_wday: number of days since Sunday (0 - 6)
+ *
+ * Converts a weekday in the numbering used in
+ * <structname>struct tm</structname> to a #GDateWeekday.
+ *
+ * Returns: a #GDateWeekday
+ **/
+GDateWeekday
+e_weekday_from_tm_wday (gint tm_wday)
+{
+       GDateWeekday weekday;
+
+       switch (tm_wday) {
+               case 0:
+                       weekday = G_DATE_SUNDAY;
+                       break;
+               case 1:
+                       weekday = G_DATE_MONDAY;
+                       break;
+               case 2:
+                       weekday = G_DATE_TUESDAY;
+                       break;
+               case 3:
+                       weekday = G_DATE_WEDNESDAY;
+                       break;
+               case 4:
+                       weekday = G_DATE_THURSDAY;
+                       break;
+               case 5:
+                       weekday = G_DATE_FRIDAY;
+                       break;
+               case 6:
+                       weekday = G_DATE_SATURDAY;
+                       break;
+               default:
+                       g_return_val_if_reached (G_DATE_BAD_WEEKDAY);
+       }
+
+       return weekday;
+}
+
 /* Evolution Locks for crash recovery */
 static const gchar *
 get_lock_filename (void)
diff --git a/e-util/e-misc-utils.h b/e-util/e-misc-utils.h
index 20a17b8..d45f8d3 100644
--- a/e-util/e-misc-utils.h
+++ b/e-util/e-misc-utils.h
@@ -147,6 +147,8 @@ GDateWeekday        e_weekday_subtract_days         (GDateWeekday weekday,
                                                 guint n_days);
 guint          e_weekday_get_days_between      (GDateWeekday weekday1,
                                                 GDateWeekday weekday2);
+gint           e_weekday_to_tm_wday            (GDateWeekday weekday);
+GDateWeekday   e_weekday_from_tm_wday          (gint tm_wday);
 
 gboolean       e_file_lock_create              (void);
 void           e_file_lock_destroy             (void);