ubuntu 256 bit color urxvt

Steps used to recompile urxvt with the 256 bit color patch.

$ apt-get source rxvt-unicode
$ sudo apt-get build-dep rxvt-unicode
$ cd rxvt-unicode*
$ patch -p1 < doc/urxvt-8.2-256color.patch 
$ dpkg-buildpackage -us -uc -rfakeroot
$ sudo dpkg -i rxvt-unicode_9.05-4_i386.deb
$ echo "rxvt-unicode hold" | sudo dpkg --set-selections

The last step makes sure apt doesn't reinstall the old package the next time you update.

urxvt meta character gotcha

I recently switched from xterms to rxvt-unicode, unfortunately the added unicode support broke some key bindings I used to navigate tabs in vim.

Originally I had:

...
map <A-1> 1gt
map <A-2> 2gt
map <A-3> 3gt
map <A-4> 4gt
map <A-5> 5gt
map <A-6> 6gt
map <A-7> 7gt
map <A-8> 8gt
map <A-9> 9gt
map <A-0> 10g
...

Allowing me to switch between tabs with alt 1-10, like firefox.

The way urxvt handles unicode, treats the alt sequence as an escape sequence.

The rxvt-unicode --meta8 option didn't help, neither did anything I found googling.

A little python foo and we have a fix.

$ python -c 'for i in xrange(1, 11): print "map \x1b%d %dgt" %((i%10), i)' >> ~/.vimrc

I now have the following in my .vimrc:

...
map ^[1 1gt
map ^[2 2gt
map ^[3 3gt
map ^[4 4gt
map ^[5 5gt
map ^[6 6gt
map ^[7 7gt
map ^[8 8gt
map ^[9 9gt
map ^[0 10gt
...

freeze.py disassemble

freeze.py is a tool used to make a standalone binary out of a python script.

freezedis.py is a tool I put together to parse the elf binary and pull the python code back out, recreating the .pyc file. For now, it does not support stripped binaries.

$ more hello.py
#!/usr/bin/env python
import sys

def main(argc, argv):
    print "hello"

if __name__ == "__main__":
    main(len(sys.argv), sys.argv)

$ /usr/share/doc/python2.5/examples/Tools/freeze/freeze.py hello.py
...
$ make
$ file hello
hello: ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV), for GNU/Linux 2.6.8,
dynamically linked (uses shared libs), not stripped

$ freezedis.py 
Usage: freezedis.py [options] filename
 -o filename.pyc (defaults to a.pyc, appends .pyc if not included)
 -d dump disassembly of newly created pyc

$ freezedis.py -d hello
  2           0 LOAD_CONST               0 (-1)
              3 LOAD_CONST               1 (None)
              6 IMPORT_NAME              0 (sys)
              9 STORE_NAME               0 (sys)

  4          12 LOAD_CONST               2 ()
             15 MAKE_FUNCTION            0
             18 STORE_NAME               1 (main)

  7          21 LOAD_NAME                2 (__name__)
             24 LOAD_CONST               3 ('__main__')
             27 COMPARE_OP               2 (==)
             30 JUMP_IF_FALSE           29 (to 62)
             33 POP_TOP             

  8          34 LOAD_NAME                1 (main)
             37 LOAD_NAME                3 (len)
             40 LOAD_NAME                0 (sys)
             43 LOAD_ATTR                4 (argv)
             46 CALL_FUNCTION            1
             49 LOAD_NAME                0 (sys)
             52 LOAD_ATTR                4 (argv)
             55 CALL_FUNCTION            2
             58 POP_TOP             
             59 JUMP_FORWARD             1 (to 63)
        >>   62 POP_TOP             
        >>   63 LOAD_CONST               1 (None)
             66 RETURN_VALUE        
Disassembly of main:
  5           0 LOAD_CONST               1 ('hello')
              3 PRINT_ITEM          
              4 PRINT_NEWLINE       
              5 LOAD_CONST               0 (None)
              8 RETURN_VALUE