[Toybox] Fwd: [New Toy - patch] add ps & watch

[David Seikel]

On Wed, 21 Aug 2013 11:52:25 -0500 Rob Landley <rob at landley.net> wrote:

> On 08/21/2013 06:47:34 AM, David Seikel wrote:
> > On Wed, 21 Aug 2013 02:11:39 -0500 Rob Landley <rob at landley.net>  
> > wrote:
> > 
> > > On 08/20/2013 11:15:42 PM, David Seikel wrote:
> > > > On Tue, 20 Aug 2013 15:55:24 -0500 Rob Landley <rob at landley.net>
> > > > wrote:
> > > >
> > > > > On 08/20/2013 04:46:20 AM, Ashwini Sharma wrote:
> > > > > > Hi Rob,
> > > > > >
> > > > > >   Attached are the patches for _watch_  and _ps_ command.
> > > > > >
> > > > > > Sent _ps_ again, just in case you lost the last one. This
> > > > > > one also have a
> > > > > > copyright update.
> > > > >
> > > > > I planned to do watch.c after doing less.c because both have
> > > > > the similar "printing a chunk of a larger screen" logic. If
> > > > > your command output produces too many lines, it shouldn't
> > > > > scroll off, but given that it can wrap around to produce more
> > > > > lines, you can't just count lines. For example:
> > > > >
> > > > >    watch 'python -c "print
> > > > > 100*\"abcdefghijklmnopqrstuvwxyz\""'
> > > > >
> > > > > This version just scrolls off. It doesn't capture the output
> > > > > and make an attempt to format it. But toybox needs that logic
> > > > > for less, more, vi, editing command line history...
> > > >
> > > > I've been thinking about what you said before about my large
> > > > editor and
> > > > screen handling blob.  I think I have found a way to at least
> > > > make one or two much smaller blobs to help ease it into
> > > > toybox.   
> > Finding
> > > > the time to get to it is a problem we are all too familiar with.
> > > > I'll get there, I want to actually use it myself.
> > >
> > > I note that busybox gets this wrong (their "watch" shows all
> > > output each time, scrolling the screen at length for "watch ls
> > > -lR /"), so it's an easy mistake to make. But I want to be
> > > _better_ than  
> > busybox.
> > 
> > Busybox's "less" also just dumps it all in one go if I remember.
> 
> Yeah, less needs to do progressive disclosure, which means a select  
> loop responding to new lines of output _and_ user keyboard input at
> the same time...
> 
> > > Also, this is one of them "damn fiddly" bits whith asynchronous
> > > ascii probing of screen size as part of interactive input,  
> > responding
> > > to dynamic window resizing (keeping in mind that sigwinch won't
> > > propogate over a serial port), fixing it so the shell notices when
> > > it's not starting at the left edge (in bash "echo -n walrus"
> > > screws up editing of the following line; at one point busybox ash
> > > got that right because I complained),
> > 
> > That's the first thing I want to do as a single smaller patch,
> > sorting out the various terminal size fiddly bits.  I had noticed
> > when I was looking at it last time that I've not completely sorted
> > that out anyway, but I was close.
> > 
> > > that fun bit about collating escape sequence input while also
> > > allowing escape by itself to put vi into command mode (I used 1/3
> > > of a second timeout)...
> > 
> > That bit I got solved, also with a time out.  Seems the only way.
> 
> That's what I implemented in busybox. :)
> 
> Where's your current code for this? Maybe I have time to look at it  
> now...

https://github.com/onefang/boxes with lots of "under construction,
excuse the mess" warnings in the readme.  No idea if it has bit rotted
since last I looked.  I hope to get time in the near future to clean it
up and split it up as I mentioned.

-- 
A big old stinking pile of genius that no one wants
coz there are too many silver coated monkeys in the world.
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