Created new plugin, zmoji.

plugins/moonphase/moonphase.plugin.zsh

@@ -0,0 +1,52 @@
+# -----------------------------------------------------------------------------
+#          FILE: moonphase.plugin.zsh
+#   DESCRIPTION: The current moon phase for your terminal prompt. Uses a very 
+#                simple calculation based upon a known new moon date. Sorry
+#                time travelers, this won't work before 1970. 
+#                Just drop '$(printmoon)' into your PROMPT where you want the
+#                moon emoji to appear.
+#        AUTHOR: Sean Carolan (scarolan[at]gmail.com)
+#       VERSION: 1.0.0
+# -----------------------------------------------------------------------------
+
+function printmoon() {
+  # Accepts a time in days between 0 and 29.53
+  # Defaults to the current moon phase
+  if (($+1)); then
+    phase=$1
+  else
+    phase=$(calcphase $(date +%s))
+  fi
+
+  if [[ $phase > 0 ]] && [[ $phase < 1 ]]; then
+    moon="🌑 "
+  elif [[ $phase > 1 ]] && [[ $phase < 7.38 ]]; then
+    moon="🌒 "
+  elif [[ $phase > 7.38 ]] && [[ $phase < 8.38 ]]; then
+    moon="🌓 " 
+  elif [[ $phase > 8.38 ]] && [[ $phase < 14.77 ]]; then
+    moon="🌔 " 
+  elif [[ $phase > 14.77 ]] && [[ $phase < 15.77 ]]; then
+    moon="🌕 "
+  elif [[ $phase > 15.77 ]] && [[ $phase < 22.15 ]]; then
+    moon="🌖 "
+  elif [[ $phase > 22.15 ]] && [[ $phase < 23.15 ]]; then
+    moon="🌗 " 
+  elif [[ $phase > 23.15 ]] && [[ $phase < 24.15 ]]; then
+    moon="🌗 "
+  elif [[ $phase > 24.15 ]] && [[ $phase < 29.53 ]]; then
+    moon="🌘 "
+  fi
+  echo $moon
+}
+
+function calcphase() {
+  # Accepts a Unix epoch date, in seconds.
+  target_date=$1
+  # Fixed lunar phase in seconds
+  lp=2551443
+  # This is the date of a known new moon: January 7, 1970 20:35 GMT
+  new_moon=592500
+  (( phase=(($target_date - $new_moon) % $lp) / (24.0 * 3600) ))
+  echo $phase
+}