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