Terminal with each line after another + some fixed text as well

Question

I'd like to have both:

• Lines displayed each one after another (Blah 12, Blah 13, Blah 14, etc.) like in a normal terminal

• Fixed position information (on right) : Date + fixed text "Bonjour"

It nearly works, until ~ Blah 250, when the look is destroyed! Why?

_{(source: gget.it)}

from sys import stdout
import time

ESC = "\x1b"
CSI = ESC+"["

def movePos(row, col):
    stdout.write("%s%d;%dH" % (CSI, row, col))
  
stdout.write("%s2J" % CSI)      # CLEAR SCREEN

for i in range(1,1000):
    movePos(i+1,60)
    print time.strftime('%H:%M:%S', time.gmtime())
    movePos(i+5,60)
    print 'Bonjour'

    movePos(24+i,0)
    print "Blah %i" % i
    time.sleep(0.01)

With an ANSI terminal, how to have both normal terminal behaviour (one new line for each print) + fixed position display?

Note: On Windows, I use ansicon.exe to have ANSI support in Windows cmd.exe.

Answer 1

Here is a solution:

_{(source: gget.it)}

The code is (check here for latest version):

"""
zeroterm is a light weight terminal allowing both:
* lines written one after another (normal terminal/console behaviour)
* fixed position text

Note: Requires an ANSI terminal. For Windows 7, please download https://github.com/downloads/adoxa/ansicon/ansi160.zip and run ansicon.exe -i to install it.
"""

from sys import stdout
import time

class zeroterm:
    def __init__(self, nrow=24, ncol=50):      # nrow, ncol determines the size of the scrolling (=normal terminal behaviour) part of the screen
        stdout.write("\x1b[2J")                # clear screen
        self.nrow = nrow
        self.ncol = ncol
        self.buf = []

    def write(self, s, x=None, y=None):        # if no x,y specified, normal console behaviour
        if x is not None and y is not None:    # if x,y specified, fixed text position
            self.movepos(x,y)
            print s
        else:
            if len(self.buf) < self.nrow:
                self.buf.append(s)
            else:
                self.buf[:-1] = self.buf[1:]
                self.buf[-1] = s

            for i, r in enumerate(self.buf):
                self.movepos(i+1,0)
                print r[:self.ncol].ljust(self.ncol)

    def movepos(self, row, col):
        stdout.write("\x1b[%d;%dH" % (row, col))


if __name__ == '__main__':
    # An exemple
    t = zeroterm()
    t.write('zeroterm', 1, 60)

    for i in range(1000):
        t.write(time.strftime("%H:%M:%S"), 3, 60)
        t.write("Hello %i" % i)
        time.sleep(0.1)