From 89d86c1b9fa69cb6479997981f6302202aca830d Mon Sep 17 00:00:00 2001
From: tv <tv@xso>
Date: Sat, 3 Sep 2011 23:03:14 +0200
Subject: //shack/Eselkalk: initial commit

This commit tries to calculate the dates of shack-plena.
---
 shack/Eselkalk/index.js | 57 +++++++++++++++++++++++++++++++++++++++++++++++++
 shack/bin/is-plenum     | 34 -----------------------------
 2 files changed, 57 insertions(+), 34 deletions(-)
 create mode 100644 shack/Eselkalk/index.js
 delete mode 100755 shack/bin/is-plenum

(limited to 'shack')

diff --git a/shack/Eselkalk/index.js b/shack/Eselkalk/index.js
new file mode 100644
index 00000000..f64e0605
--- /dev/null
+++ b/shack/Eselkalk/index.js
@@ -0,0 +1,57 @@
+//
+// node //shack/Eselkalk DATE
+//
+// where DATE ∈ [YYYY[-MM]], defaulting to the current YYYY-MM
+//
+
+range = process.argv[2] ||
+    JSON.parse(JSON.stringify(new Date())).slice(0, '....-..'.length)
+
+function dates(date) {
+  var year = date.getFullYear()
+  var month = date.getMonth()
+
+  var i = new Date([year, (month < 9 ? '0' : '') + (month + 1)].join('-'))
+
+  var days = []
+  var next_day = 4;
+  for (
+      ; i.getMonth() === month
+      ; i = new Date(+i + 24 * 60 * 60 * 1000)) {
+    if (i.getDay() === next_day) {
+      next_day = next_day === 3 ? 4 : 3
+      if (next_day === 3) {
+        var next_4day = new Date(+i + 7 * 24 * 60 * 60 * 1000)
+        if (next_4day.getMonth() !== month) {
+          i = new Date(+i - 24 * 60 * 60 * 1000)
+          next_4day = 4
+        }
+      }
+      days.push(new Date(+i + (20 * 60 + i.getTimezoneOffset()) * 60 * 1000))
+      while (i.getDay() !== 0) {
+        i = new Date(+i + 24 * 60 * 60 * 1000)
+      }
+    }
+  }
+
+  return days
+}
+
+
+result = []
+
+// TODO if (/^....-..-..$/.test(range)) { ... }
+if (/^....-..$/.test(range)) {
+  result = dates(new Date(range))
+}
+else if (/^....$/.test(range)) {
+  ['01','02','03','04','05','06','07','08','09','10','11','12'
+  ].forEach(function (i) {
+    result = result.concat(dates(new Date([range, i].join('-'))))
+  })
+}
+else {
+  throw new Error('You are made of stupid! ' + range)
+}
+
+console.log(JSON.stringify(result, null, 2))
diff --git a/shack/bin/is-plenum b/shack/bin/is-plenum
deleted file mode 100755
index 1c686ca1..00000000
--- a/shack/bin/is-plenum
+++ /dev/null
@@ -1,34 +0,0 @@
-#! /bin/sh
-#
-# //shack/is-plenum [YEAR]
-#
-# where YEAR defaults to the current year
-#
-
-y=${1-`date +%Y`}
-for m in `seq 1 12`; do
-  t1=
-  t2=
-  t3=
-  t4=
-  t5=
-  week_done=-1
-  for d in `cal $m $y | tr ' ' '\n' | grep '^[0-9][0-9]\?$'`; do
-    echo $m | grep -q '^.$' && m=0$m
-    echo $d | grep -q '^.$' && d=0$d
-    date=$y-$m-$d
-    date_week=`date -d $date +%W`
-    if test $week_done -lt $date_week; then
-      test -z "$t1" && { test `date -d $date +%u` = 4 && t1=$date && week_done=$date_week; continue; }
-      test -z "$t2" && { test `date -d $date +%u` = 3 && t2=$date && week_done=$date_week; continue; }
-      test -z "$t3" && { test `date -d $date +%u` = 4 && t3=$date && week_done=$date_week; continue; }
-      test -z "$t4" && { test `date -d $date +%u` = 3 && t4=$date && week_done=$date_week; continue; }
-      test -z "$t5" && { test `date -d $date +%u` = 3 && t5=$date && week_done=$date_week; continue; }
-    fi
-  done
-  test -n "${t1}" && echo $t1
-  test -n "${t2}" && echo $t2
-  test -n "${t3}" && echo $t3
-  test -n "${t4}" && echo $t4
-  test -n "${t5}" && echo $t5
-done
-- 
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