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37 Date: Mon, 27 Jun 2011 23:49:37 -0400
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38 From: Austin Clements <amdragon@MIT.EDU>
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39 To: Dmitry Kurochkin <dmitry.kurochkin@gmail.com>
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40 Subject: Re: [PATCH 2/2] test: use emacsclient(1) for Emacs tests
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41 Message-ID: <20110628034937.GB4120@mit.edu>
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42 References: <1309132379-24089-1-git-send-email-dmitry.kurochkin@gmail.com>
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81 Quoth Dmitry Kurochkin on Jun 28 at 5:03 am:
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82 > > > The only way I know to
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83 > > > reliably kill a child process is to open a pipe to it and have it exit
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84 > > > on its own when it reads EOF. Unfortunately, I couldn't find a way to
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85 > > > do this with an emacs daemon (it appears daemon mode aggressively
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86 > > > cleans up things like pipes), but here's a different approach:
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88 > > > coproc emacs --batch --eval "(while t (eval (read)))"
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89 > > > EMACSFD=${COPROC[1]}
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90 > > > trap "echo '(kill-emacs)' >&$EMACSFD" EXIT
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92 > > > echo '(message "Hi")' >&$EMACSFD
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95 > > > This is, basically, a poor man's emacs server, but the coprocess pipe
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96 > > > binds it tightly to the shell. If the shell exits for *any* reason,
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97 > > > the pipe will be closed by the kernel, emacs will read an EOF, and
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100 > > I like this idea.
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102 > > > The trap is there just to cleanly shut down in case of a normal
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105 > > For normal exit we should just put this into test_done. Otherwise it is
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106 > > not a normal exit and we do not care about Emacs error message. No?
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108 > > > This also has the advantage that read-from-minibuffer still
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111 > > > echo '(message (read-from-minibuffer ""))' >&$EMACSFD
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112 > > > echo 'Test' >&$EMACSFD
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117 > > I like it and I will implement it. Thanks for the idea.
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120 > While implementing the idea, I stumbled upon a problem: we need to know
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121 > when Emacs finished what we echoed or failed with an error. At the
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122 > moment tests fail because they check for OUTPUT before Emacs creates it.
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124 > We can tell Emacs to print some special marker and wait for it. But
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125 > there may be exceptions and errors which may make it difficult. I did
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126 > not found a good solution yet. Would love to hear your thoughts :)
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128 Oof, yes, of course. How about making the one-line poor man's emacs
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129 server slightly less poor? Use a FIFO to communicate completion.
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132 EMACSDONE=$TEST_DIRECTORY/emacsdone
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134 coproc emacs --batch --eval '(while t (eval (read)) (write-region "\n" nil "'$EMACSDONE'" t 0))'
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135 EMACSFD=${COPROC[1]}
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138 echo "$1" >&$EMACSFD
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142 test_emacs '(sleep-for 2)'
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143 test_emacs '(message "Hi")'
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145 echo '(kill-emacs)' >&$EMACSFD
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