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bug#21588: 25.0.50: Single quotes becoming curvy quotes in message funct

From: Paul Eggert
Subject: bug#21588: 25.0.50: Single quotes becoming curvy quotes in message function
Date: Wed, 30 Sep 2015 15:40:53 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.1.0

Kaushal Modi wrote:
It doesn't feel right that (message "'Hey'") gets displayed as ’Hey’.

This shouldn't happen if your ~/.emacs has (setq text-quoting-style 'grave) or (setq text-quoting-style 'straight), so I assume the issue came up because your text-quoting-style is ‘curve’ or defaults to ‘curve’.

The initial version of the ‘curve’ code behaved as you suggested, and left isolated apostrophes alone. But as Dmitry pointed out, apostrophe in English is represented by right single quotation mark as standard typographic practice in fonts with directed quotes. In traditional Emacs usage most isolated apostrophes in docstrings and diagnostics are English apostrophes, so it seemed appropriate to default to transliterating them as in English, of course with an escape hatch for the exceptions intended to be straight apostrophes. So I changed the code to translate all non-escaped apostrophes. This simplified the transformation rules, which was also a win.

Although there were a few diagnostics in Elisp that quoted English phrases 'like this', as I recall RMS said that directed quotes were preferred, so I fixed the instances I found to quote `like this' in message format strings. Undoubtedly I missed some instances and so some minor display glitches remain, but they can be fixed as they turn up.

To get typewriter-style straight quoting in your own code, independent of text-quoting-style, you can write (message "%s" "'Hey'").

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