oh-my-zsh/plugins/emacs/emacsclient.sh

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#!/bin/sh
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# get list of available X windows.
x=`emacsclient --alternate-editor '' --eval '(x-display-list)' 2>/dev/null`
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if [ -z "$x" ] || [ "$x" = "nil" ] ;then
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# Create one if there is no X window yet.
emacsclient --alternate-editor "" --create-frame "$@"
else
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# prevent creating another X frame if there is at least one present.
emacsclient --alternate-editor "" "$@"
fi