From: Felipe Contreras <felipe.contreras@gmail.com>
Date: Fri, 11 Apr 2014 23:32:25 +0000 (-0500)
Subject: prompt: fix missing file errors in zsh
X-Git-Tag: v2.0.0-rc0~4^2
X-Git-Url: https://git.lorimer.id.au/gitweb.git/diff_plain/59d3924fbb300ebfe05f9079bcfe29d0a3f30661?ds=inline;hp=59d3924fbb300ebfe05f9079bcfe29d0a3f30661

prompt: fix missing file errors in zsh

zsh seems to have a bug while redirecting the stderr of the 'read'
command:

% read foo 2>/dev/null <foo
zsh: no such file or directory: foo

Which causes errors to be displayed when certain files are missing.
Let's add a convenience function to manually check if the file is
readable before calling "read".

Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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