Change peco history script into custom oh-my-zsh plugin

shell/zsh/custom/plugins/peco-history/peco-history.plugin.zsh

@@ -0,0 +1,19 @@
+# History search with peco
+#
+# Search shell history with peco: https://github.com/peco/peco
+# Adapted from: https://github.com/mooz/percol#zsh-history-search
+if which peco &> /dev/null; then
+  function peco_select_history() {
+    local tac
+    (which gtac &> /dev/null && tac="gtac") || \
+      (which tac &> /dev/null && tac="tac") || \
+      tac="tail -r"
+    BUFFER=$(fc -l -n 1 | eval $tac | \
+                peco --layout=bottom-up --query "$LBUFFER")
+    CURSOR=$#BUFFER # move cursor
+    zle -R -c       # refresh
+  }
+
+  zle -N peco_select_history
+  bindkey '^R' peco_select_history
+fi