Improve easter egg for 20 years of grml.org

[grml-autoconfig.git] / autoconfig.functions

diff --git a/autoconfig.functions b/autoconfig.functions
index 0da044d..254129b 100755 (executable)
--- a/autoconfig.functions
+++ b/autoconfig.functions
@@ -1992,5 +1992,43 @@ fi
 }
 # }}}
 
+# {{{ Easteregg (for 20 years grml.org)
+display_easteregg() {
+  einfo "You found the birthday easter egg!" ; eend 0
+
+  if [[ -x /bin/toilet && -x /usr/games/lolcat ]] ; then
+    visualize() { printf "%s\n" "$*" | toilet | /usr/games/lolcat ; }
+  elif [[ -x /bin/toilet ]] ; then
+    visualize() { printf "%s\n" "$*" | toilet ; }
+  else
+    visualize() { printf "%s\n" "$*" ; }
+  fi
+
+  visualize "   \o/   "
+  visualize "20 years"
+  visualize "grml.org"
+}
+
+config_easteregg() {
+  checkbootparam 'noeasteregg' && return 0
+
+  zmodload zsh/datetime 2>/dev/null || return 0
+  zmodload zsh/mathfunc 2>/dev/null || return 0
+
+  local birthday=1694822400            # := 2023-09-16 -> TZ=UTC date -d "2023-09-16" +%s
+  local one_month=$[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 #################################################################
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