Add weekday abbreviation for open-today widget

RruleHumanizer gains WEEKDAY_NAMES_ABBR (Mo/Di/Mi/...) alongside the
existing WEEKDAY_NAMES and WEEKDAY_NAMES_ADVERBIAL hashes, plus a
self.wday_abbr(time, locale) utility mapping a Time's wday to its
RFC5545 code and looking up the abbreviation - keeping RFC5545
vocabulary in one place rather than teaching ContentHelper about day
codes directly.

ContentHelper#weekday_abbr is a thin wrapper passing I18n.locale
through. The partial now renders "Fr 19:00" instead of just "19:00",
joined with a non-breaking space so the pair can't split across a
line wrap.

Takes an explicit Time rather than reading Date.today, matching this
file's existing style of passing state in rather than reading it
ambiently - and staying correct if the currently-unused
calendar/_front_page_calendar partial (spanning six weeks, not just
today) is ever revived and reuses this helper.

1 files changed, 9 insertions, 0 deletions

diff --git a/app/models/concerns/rrule_humanizer.rb b/app/models/concerns/rrule_humanizer.rb
index 6cee711..8231de8 100644
--- a/app/models/concerns/rrule_humanizer.rb
+++ b/app/models/concerns/rrule_humanizer.rb
@@ -10,6 +10,10 @@ module RruleHumanizer
     de: { "MO"=>"montags","TU"=>"dienstags","WE"=>"mittwochs","TH"=>"donnerstags","FR"=>"freitags","SA"=>"samstags","SU"=>"sonntags" }
   }.freeze
 
+  WEEKDAY_NAMES_ABBR = {
+    de: { "MO"=>"Mo","TU"=>"Di","WE"=>"Mi","TH"=>"Do","FR"=>"Fr","SA"=>"Sa","SU"=>"So" }
+  }.freeze
+
   ORDINAL_NAMES = {
     de: { 1=>"ersten", 2=>"zweiten", 3=>"dritten", 4=>"vierten", -1=>"letzten", -2=>"vorletzten" },
     en: { 1=>"first", 2=>"second", 3=>"third", 4=>"fourth", -1=>"last", -2=>"second-to-last" }
@@ -79,4 +83,9 @@ module RruleHumanizer
 
     base
   end
+
+  def self.wday_abbr(time, locale)
+    code = %w[SU MO TU WE TH FR SA][time.wday]
+    (WEEKDAY_NAMES_ABBR[locale.to_sym] || WEEKDAY_NAMES_ABBR[:de])[code]
+  end
 end