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When I navigate through `describe-function' to the source of a function, very often the buffer is visiting a file with a ".el.gz" extension.

Often these files are multi-thousand lines, so a list of functions and variables would be quite useful. And speedbar-mode provides exactly the sort of listing that I'm thinking about.

However, speedbar-mode doesn't work in these buffers. Is there an easy way to get speedbar-mode to work in these buffers?

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    Speedbar uses the imenu library to generate the type of view you are thinking about. The easiest way to handle your issue would be to build Emacs using the --without-compress-install flag ("don't compress some files (.el, .info, etc.) when installing. Equivalent to: make GZIP_PROG= install"); or, use an extraction utility and extract all of the .el files in the lisp and emacs-lisp directories.
    – lawlist
    Nov 21, 2019 at 16:51
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    ... recursively, that is ... (relating to the extraction comment above); i.e., extracting files in the subdirectories as well.
    – lawlist
    Nov 21, 2019 at 18:47

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It turns out that speedbar has variable containing a whitelist of file extensions which it will index. This is speedbar-supported-extension-expressions.

The correct way to update this variable is:

(speedbar-add-supported-extension ".el.gz")

(Note that when I was working on this, I had to restart emacs before the .el.gz files were indexable by speedbar.)

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