use ~/bin like a civilized nixer

1 files changed, 100 insertions, 0 deletions

diff --git a/fun/bin/rain b/fun/bin/rain
new file mode 100755
index 0000000..8a8d8f6
--- /dev/null
+++ b/fun/bin/rain
@@ -0,0 +1,100 @@
+#!/bin/bash
+RAINS=("|" "│" "┃" "┆" "┇" "┊" "┋" "╽" "╿")
+COLORS=("\e[37m" "\e[37;1m")
+# More from 256 color mode
+for i in {244..255}; do
+  COLORS=("${COLORS[@]}" "\e[38;5;${i}m")
+done
+NRAINS=${#RAINS[@]}
+NCOLORS=${#COLORS[@]}
+NUM_RAIN_METADATA=5
+
+
+sigwinch() {
+  TERM_WIDTH=$(tput cols)
+  TERM_HEIGHT=$(tput lines)
+  STEP_DURATION=0.025
+  ((MAX_RAINS = TERM_WIDTH * TERM_HEIGHT / 4))
+  ((MAX_RAIN_LENGTH = TERM_HEIGHT < 10 ? 1 : TERM_HEIGHT / 10))
+  # In percentage
+  ((NEW_RAIN_ODD = TERM_HEIGHT > 50 ? 100 : TERM_HEIGHT * 2))
+  ((NEW_RAIN_ODD = NEW_RAIN_ODD * 75 / 100))
+  ((FALLING_ODD = TERM_HEIGHT > 25 ? 100 : TERM_HEIGHT * 4))
+  ((FALLING_ODD = FALLING_ODD * 90 / 100))
+  }
+
+do_exit() {
+  echo -ne "\e[${TERM_HEIGHT};1H\e[0K"
+
+  # Show cursor and echo stdin
+  echo -ne "\e[?25h"
+  stty echo
+  exit 0
+  }
+
+do_render() {
+  # Clean screen first
+  for ((idx = 0; idx < num_rains * NUM_RAIN_METADATA; idx += NUM_RAIN_METADATA)); do
+    X=${rains[idx]}
+    Y=${rains[idx + 1]}
+    LENGTH=${rains[idx + 4]}
+    for ((y = Y; y < Y + LENGTH; y++)); do
+      (( y < 1 || y > TERM_HEIGHT )) && continue
+      echo -ne "\e[${y};${X}H "
+    done
+  done
+
+  for ((idx = 0; idx < num_rains * NUM_RAIN_METADATA; idx += NUM_RAIN_METADATA)); do
+    if ((100 * RANDOM / 32768 < FALLING_ODD)); then
+      # Falling
+      if ((++rains[idx + 1] > TERM_HEIGHT)); then
+        # Out of screen, bye sweet <3
+        rains=("${rains[@]:0:idx}"
+               "${rains[@]:idx+NUM_RAIN_METADATA:num_rains*NUM_RAIN_METADATA}")
+        ((num_rains--))
+        continue
+      fi
+    fi
+    X=${rains[idx]}
+    Y=${rains[idx + 1]}
+    RAIN=${rains[idx + 2]}
+    COLOR=${rains[idx + 3]}
+    LENGTH=${rains[idx + 4]}
+    for ((y = Y; y < Y + LENGTH; y++)); do
+      (( y < 1 || y > TERM_HEIGHT )) && continue
+      echo -ne "\e[${y};${X}H${COLOR}${RAIN}"
+    done
+  done
+  }
+
+trap do_exit TERM INT
+trap sigwinch WINCH
+# No echo stdin and hide the cursor
+stty -echo
+echo -ne "\e[?25l"
+
+echo -ne "\e[2J"
+rains=()
+sigwinch
+while :; do
+  read -n 1 -t $STEP_DURATION ch
+  case "$ch" in
+    q|Q)
+      do_exit
+      ;;
+  esac
+
+  if ((num_rains < MAX_RAINS)) && ((100 * RANDOM / 32768 < NEW_RAIN_ODD)); then
+    # Need new |, 1-based
+    RAIN="${RAINS[NRAINS * RANDOM / 32768]}"
+    COLOR="${COLORS[NCOLORS * RANDOM / 32768]}"
+    LENGTH=$((MAX_RAIN_LENGTH * RANDOM / 32768 + 1))
+    X=$((TERM_WIDTH * RANDOM / 32768 + 1))
+    Y=$((1 - LENGTH))
+    rains=("${rains[@]}" "$X" "$Y" "$RAIN" "$COLOR" "$LENGTH")
+    ((num_rains++))
+  fi
+
+  # Let rain fall!
+  do_render
+done
\ No newline at end of file