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function ecd
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set -l cmd '(let ((buf-name (buffer-file-name (window-buffer))))
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(if buf-name (file-name-directory buf-name)))'
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set -l dir (__launch_emacs --eval $cmd | tr -d '\"')
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if test -n "$dir"
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echo $dir
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else
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echo 'cannot deduce current buffer filename.' >/dev/stderr
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end
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end
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