fish-shell/doc_src/funced.txt

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\section funced funced - edit a function interactively
\subsection funced-synopsis Synopsis
\fish{syn}
funced [OPTIONS] NAME
\endfish
\subsection funced-description Description
`funced` provides an interface to edit the definition of the function
`NAME`.
If the `$EDITOR` environment variable is set, it will be used as the program
to edit the function. Otherwise, a built-in editor will be used.
If there is no function called `NAME` a new function will be created with
the specified name
- `-e command` or `--editor command` Open the function
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body inside the text editor given by the command (for example, "vi"). The
command 'fish' will use the built-in editor.
- `-i` or `--interactive` Open function body in the
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built-in editor.