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dd fans rejoice!
Also helps with commands like go test -run=x.
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This fixes at least one shell script (printfont) that expected
'x'`{y}'z'
to mean
'x'^`{y}^'z'
as it now does. Before it meant:
'x'^`{y} 'z'
One surprise is that adjacent lists get a free carat:
(x y z)(1 2 3)
is
(x1 y2 z3)
This doesn't affect any rc script in Plan 9 or plan9port.
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The old yacc-based parser is available with the -Y flag,
which will probably be removed at some point.
The new -D flag dumps a parse tree of the input,
without executing it. This allows comparing the output
of rc -D and rc -DY on different scripts to see that the
two parsers behave the same.
The rc paper ends by saying:
It is remarkable that in the four most recent editions of the UNIX
system programmer’s manual the Bourne shell grammar described in the
manual page does not admit the command who|wc. This is surely an
oversight, but it suggests something darker: nobody really knows what
the Bourne shell’s grammar is. Even examination of the source code is
little help. The parser is implemented by recursive descent, but the
routines corresponding to the syntactic categories all have a flag
argument that subtly changes their operation depending on the context.
Rc’s parser is implemented using yacc, so I can say precisely what the
grammar is.
The new recursive descent parser here has no such flags.
It is a straightforward translation of the yacc.
The new parser will make it easier to handle free carats
in more generality as well as potentially allow the use of
unquoted = as a word character.
Going through this exercise has highlighted a few
dark corners here as well. For example, I was surprised to
find that
x >f | y
>f x | y
are different commands (the latter redirects y's output).
It is similarly surprising that
a=b x | y
sets a during the execution of y.
It is also a bit counter-intuitive
x | y | z
x | if(c) y | z
are not both 3-phase pipelines.
These are certainly not things we should change, but they
are not entirely obvious from the man page description,
undercutting the quoted claim a bit.
On the other hand, who | wc is clearly accepted by the grammar
in the manual page, and the new parser still handles that test case.
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This avoids reopening collapsed windows after a large vertical resize.
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and not unexpectedly quitting an application.
Fixes #360
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Missed in 0b349f6f that Bterm is not closing fd.
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Fixes #3.
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The issue manifests in fork: POSIX fork mandates that a
fork'd process is created with a single thread. If a
multithreaded program forks, and some thread was in
malloc() when the fork() happened, then in the child
the lock will be held but there will be no thread to
release it.
We assume the system malloc() must already know how to
deal with this and is thread-safe, but it won't know about
our custom spinlock. Judging that this is no longer
necessary (the lock code was added 15 years ago) we remove
it.
Signed-off-by: Dan Cross <cross@gajendra.net>
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Fixes #347.
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Fixes #54.
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Fixes #340.
Fixes #343.
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Unclear whether the old semantics were the right ones,
but at least this preserves what they've been for the past
however many years.
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Add #define USED(x)... boilerplate
compress: import Plan9 manpage.
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This is new code, and custom to plan9port. Make it
conform more closely to plan9 style.
Signed-off-by: Dan Cross <cross@gajendra.net>
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`struct Tm tms` was set but never referenced; noticed
in a compiler warning. Remove it.
Signed-off-by: Dan Cross <cross@gajendra.net>
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Port of Plan 9's winwatch(1).
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Fixes #93.
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Fixes #339.
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The dump substitutes each \n in a multiline tag with a 0xff byte.
Since it is not valid UTF it cannot occur in an ordinary dump file.
Old acmes will just read it in as an error rune.
Fixes #135.
Fixes #153.
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This hides the menu on dock on all screens which is more than we want.
The code was added to fix a problem with Catalina that I can no longer
reproduce, so I guess it works now.
Fixes #336.
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Unfortunately this hides the dock even if it is on a
different screen. We need to figure out how to tell.
But this is more usable than not.
Probably.
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`window:willUseFullScreenPresentationOptions:` is an instance method
of the protocol `NSWindowDelegate`.
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There are many things we could do to make this work.
an environment variable to control the character.
Another option would be to use U+00A0 (non-breaking space),
which renders the same as space.
This change avoids changing the separator character and instead
assumes that if the left side of the tag already ends in " Del Snarf |"
then what comes before that is the file name.
Acme already aggressively preserves the "Del Snarf |",
so this should work decently well as a stop-gap.
We can always try something else later.
Fixes #26.
Fixes #104.
Fixes #329.
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Avoid signed integer overflow using ulong instead of long h.
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This brings mk's behavior when using rc in line with Plan 9's.
The existing code is for Unix environment data structures but
also was assuming Unix shell semantics where empty and missing
variables are mostly equivalent.
The Plan 9 code (/sys/src/cmd/mk/plan9.c in the distribution)
explicitly removes /env/name (creating an empty list) when the
value is missing or an empty string.
Fixes #255.
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Fixes #9.
Fixes #219.
Fixes #222.
Fixes #330.
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When a directory has lots of children, vac crashes because it runs out of cache.
Fixes #266.
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f is open, so walk will fail.
The comments say we only need one directory anyway.
Fixes #277.
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Improved error message in case of unexpected open flags. The message
unexpected open flags requested=0100040 unhandled=040
prompted me to clear the FMODE_EXEC flag, although I wonder if I
shouldn't have set OEXEC (0x3) instead.
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Fixes #250.
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Fixes #273.
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Need to think a bit more about locking,
but overall it's a working devdraw.
Multiclient mode may not be working
but nothing is using it yet.
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Also turn mac-srv.c into a generic srv.c,
so we can remove the duplication with x11-srv.c.
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