Add dircycle mode: cycle directory stack with Ctrl+Shift+Left/Right

modules/dircycle/README.md

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+# Overview
+
+`dircycle` provides you with a way to quickly cycle through your dir stack without destroying the currently entered command.
+
+# Usage
+
+* Ctrl+Shift+Left: rotates the directory stack one step backward
+* Ctrl+Shift+Right: rotates the directory stack one step forward

modules/dircycle/init.zsh

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+##
+# dircycle plugin: enables cycling through the directory
+# stack using Ctrl+Shift+Left/Right
+
+alias dircycle-left="pushd -q +1"
+alias dircycle-right="pushd -q -0"
+
+eval "insert-cycledleft () { zle push-line; LBUFFER='dircycle-left'; zle accept-line }"
+zle -N insert-cycledleft
+bindkey "\e[1;6D" insert-cycledleft
+eval "insert-cycledright () { zle push-line; LBUFFER='dircycle-right'; zle accept-line }"
+zle -N insert-cycledright
+bindkey "\e[1;6C" insert-cycledright