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bug#20322: 25.0.50; indent-tabs-mode should default to nil

From: Dmitry Gutov
Subject: bug#20322: 25.0.50; indent-tabs-mode should default to nil
Date: Wed, 15 Apr 2015 14:18:43 +0300
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:36.0) Gecko/20100101 Thunderbird/36.0

On 04/15/2015 05:33 AM, Richard Stallman wrote:

Tabs make file smaller.  I just did an experiment.  In lread.c, M-x
untabify changed 139702 characters into 155402 characters, which is
11% bigger.

Right, I suppose that made sense, back in the day. Thanks for the context.

For subr.el, it was smaller: 200817 characters became 209939, only
4.5% bigger.  However, files.el got 12% bigger.

If most of a git repository is text from various versions of files,
the repository is also likely to get around 10% bigger without tabs,
and now you're talking about 30 meg more.

Git compresses the file contents with zlib when storing them. Let's compare the compressed versions of files.el:

$ gzip --keep files.el
$ gzip --keep files-notabs.el
$ ls -l files.el.gz files-notabs.el.gz
-rw-rw-r-- 1 gutov gutov 85735 Apr 12 22:26 files.el.gz
-rw-rw-r-- 1 gutov gutov 87471 Apr 15 14:07 files-notabs.el.gz

That's only a 2% increase in compressed size for the file with the largest difference. For subr.el, as another example, the difference is 0.56%.

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