X-Git-Url: https://git.grml.org/?p=grml-autoconfig.git;a=blobdiff_plain;f=autoconfig.functions;fp=autoconfig.functions;h=254129b5655401210fc41f5bd963f0e4fa5b66be;hp=b7d694c0fe4b0c35238c62c0245059eec5fd8756;hb=4e06a5ed225c72954f03d12c07aa8bc33fbcd78f;hpb=2b0f0ee95d9c4e179b94d1d5333e683665e082a6

diff --git a/autoconfig.functions b/autoconfig.functions
index b7d694c..254129b 100755
--- a/autoconfig.functions
+++ b/autoconfig.functions
@@ -1993,18 +1993,9 @@ fi
 # }}}
 
 # {{{ Easteregg (for 20 years grml.org)
-config_easteregg() {
-  current_date=$(date +%Y-%m-%d)
-  birthday="2023-09-16"
-  one_month_later=$(date -d "${current_date} + 1 month" +%Y-%m-%d)
-
+display_easteregg() {
   einfo "You found the birthday easter egg!" ; eend 0
 
-  # nothing to be done if it's more than one month since $birthday
-  if ! [[ "${current_date}" == "${birthday}" || "${current_date}" == "${one_month_later}" ]]; then
-    return 0
-  fi
-
   if [[ -x /bin/toilet && -x /usr/games/lolcat ]] ; then
     visualize() { printf "%s\n" "$*" | toilet | /usr/games/lolcat ; }
   elif [[ -x /bin/toilet ]] ; then
@@ -2017,6 +2008,26 @@ config_easteregg() {
   visualize "20 years"
   visualize "grml.org"
 }
+
+config_easteregg() {
+  checkbootparam 'noeasteregg' && return 0
+
+  zmodload zsh/datetime 2>/dev/null || return 0
+  zmodload zsh/mathfunc 2>/dev/null || return 0
+
+  local birthday=1694822400            # := 2023-09-16 -> TZ=UTC date -d "2023-09-16" +%s
+  local one_month=$[24*30*3600]
+  local pi=3.14159265358979323846
+  local magic=$(( one_month/(pi/2) ))  # normalization factor, used to map the [birthday;birthday+-one_month] range onto [0;+-pi/2]
+
+  if [[ $(( abs(birthday-EPOCHSECONDS) )) -le $one_month ]] ; then
+    if [[ $(( rand48() )) -le $(( cos((birthday-EPOCHSECONDS)/magic) )) ]] ; then
+      display_easteregg
+    fi
+  fi
+
+  return 0
+}
 # }}}
 
 ## END OF FILE #################################################################