forks/apenwarr-redo
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$3 and stdout no longer refer to the same file.

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This is slightly inelegant, as the old style
	echo foo
	echo blah
	chmod a+x $3

doesn't work anymore; the stuff you wrote to stdout didn't end up in $3.
You can rewrite it as:
	exec >$3
	echo foo
	echo blah
	chmod a+x $3

Anyway, it's better this way, because now we can tell the difference between
a zero-length $3 and a nonexistent one.  A .do script can thus produce
either one and we'll either delete the target or move the empty $3 to
replace it, whichever is right.

As a bonus, this simplifies our detection of whether you did something weird
with overlapping changes to stdout and $3.
This commit is contained in:
Avery Pennarun 2010-12-11 00:29:04 -08:00
commit 59201dd7a0
9 changed files with 54 additions and 29 deletions
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7
t/clean.do
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@ -1,4 +1,5 @@
redo example/clean curse/clean deps/clean "space dir/clean"
rm -f c c.c c.c.c c.c.c.b c.c.c.b.b d mode1 makedir.log chdir1
rm -f hello [by]ellow *.o *~ .*~ CC LD passfail
rm -rf makedir
rm -f c c.c c.c.c c.c.c.b c.c.c.b.b d mode1 makedir.log chdir1 \
hello [by]ellow *.o *~ .*~ CC LD passfail silence silence.do \
touch1 touch1.do
rm -rf makedir