bash/christmas: festive holiday celebration

bash/christmas

@@ -0,0 +1,95 @@
+#!/usr/bin/env bash
+
+reset() {
+  tput reset
+  tput cnorm
+  exit
+}
+
+trap reset EXIT
+read -ra date < <(date "+%Y %m %d")
+
+if (( date[1] == 12 && date[2] > 25 )); then
+  new_year=$(( date[0] + 1 ))
+else
+  new_year=${date[0]}
+fi
+
+clear
+tput civis
+tput setaf 2
+tput bold
+
+lines=2
+cols=$(( $(tput cols) / 2 ))
+cur_col=$(( cols - 1 ))
+
+for (( needles = 1; needles < 20; needles += 2 )); do
+  tput cup "$lines" "$cols"
+
+  for (( needle = 0; needle < needles; ++needle )); do
+    printf '*'
+  done
+
+  (( lines++ ))
+  (( cols-- ))
+done
+
+tput sgr0
+tput setaf 3
+
+for _ in {1..2}; do
+  tput cup "$(( lines++ ))" "$cur_col"
+  printf 'MWM\n'
+done
+
+tput setaf 1
+tput bold
+tput cup "$lines" "$(( cur_col - 6 ))"
+printf 'MERRY CHRISTMAS\n'
+tput cup "$(( lines + 1 ))" "$(( cur_col - 10 ))"
+printf 'And lots of CODE in %d\n' "$new_year"
+
+(( ++cur_col ))
+pos=1
+color=0
+line=( )
+column=( )
+
+while true; do
+  for needle in {1..35}; do
+    if (( pos > 1 )); then
+      needle_pos=$(( pos - 1 ))$needle
+
+      tput setaf 2
+      tput bold
+      tput cup "${line[$needle_pos]}" "${column[$needle_pos]}"
+      printf '*'
+      unset line["$needle_pos"]
+      unset column["$needle_pos"]
+    fi
+
+    new_line=$(( RANDOM % 9 + 3 ))
+    start=$(( cur_col - new_line + 2 ))
+    new_col=$(( RANDOM % (new_line - 2) * 2 + 1 + start ))
+
+    tput setaf "$color"
+    tput bold
+    tput cup "$new_line" "$new_col"
+    printf 'o'
+
+    line[$pos$needle]=$new_line
+    column[$pos$needle]=$new_col
+    color=$(( (color + 1) % 8 ))
+    sh=1
+
+    for l in C O D E; do
+      tput cup "$(( lines + 1 ))" "$(( cur_col + sh ))"
+      printf '%s' "$l"
+      (( sh++ ))
+      sleep 0.01
+    done
+  done
+
+  pos=$(( pos % 2 + 1 ))
+done