Creating a pacifier in command line program

[Jerry Mr]

I am trying to create a program that, at one part, replaces already
displayed on the line with another.

For example:

Lets say the program is recursing directories.

It should display:

checking c:\Program Files\

then when it is done with that directory replace that line with the
next, not create another below it.

I have been unable to locate information about this, though I don't
really know what to call it.

Thank you.

 

[Walton Hoops]

Ruby comes pre-packaged with a curses library that (supposedly) works
with both Linux and Windows. It is completely undocumented (that I
can find), but the C Curses library may help. Have a look at:
http://heather.cs.ucdavis.edu/~matloff/UnixAndC/CLanguage/Curses.pdf

The ruby curses lack-of-documentation:
http://ruby-doc.org/stdlib/libdoc/curses/rdoc/index.html

Hope this helps!

 

[Tim Hunter]

I am trying to create a program that, at one part, replaces already
displayed on the line with another.

For example:

Lets say the program is recursing directories.

It should display:

checking c:\Program Files\

then when it is done with that directory replace that line with the
next, not create another below it.

I have been unable to locate information about this, though I don't
really know what to call it.

Thank you.

I think this will work in Windows but I don't have it to test. It works
in OS X and Linux terminal windows.

Instead of terminating the output line with a \n (or allowing it to
default to a \n), use \r instead. "\r" is a carriage return, so the
cursor will return to the start of the same line and overprint it.

For example,

10.times { |n| printf("Hello %d\r", n);sleep 1 }

Will print

Hello 0
Hello 1
Hello 2

etc., except each new "Hello" line overprints the previous one so you
only see 1 line.

 

[Jerry Piazza]

Thank you!

That did the trick perfectly!

 

[Jerry Piazza]

Well, now I am trying to impliment this into a program.

Example:

def spinner spin_trigger
while (spin_trigger == true)
print "\\\r"
sleep 1
print "|\r"
sleep 1
print "/\r"
sleep 1
print "-\r"
sleep 1
end
end

spin = true
Thread.new do
spinner spin
end
files = Dir.glob("c/**/*.txt)
spin = false


All I am getting is "\" until the Dir command is complete.
The method works perfectly when not running inside another program.

It must have something to do with the new thread I am creating, but I
cannot figure out what...hrm.

 

[Jerry Piazza]

files = Dir.glob("c/**/*.txt)
--> files = Dir.glob("c/**/*.txt")
Yes, I realize there is a typo after the .txt.
That typo is not in the program.

 

[Colin Bartlett]

[Note: parts of this message were removed to make it a legal post.]

Further to the other responses, there is a thread here which has similar
issues.
http://blade.nagaokaut.ac.jp/cgi-bin/scat.rb/ruby/ruby-talk/336718