(patch for Bash) dynamically loadable builtins

[William Park]

Dear all,

Latest incarnation of my patch is now at
    http://freshmeat.net/projects/bashdiff/

By popular demands, I converted all builtins as dynamically loadables.
And, simple x-y character plot has been added since last post.

I personally don't like putting builtins in a separate shared object
file.  But, it allows people to try my patch, without compiling the
entire Bash shell from scratch.


To compile just the loadables,
    
    wget ftp://ftp.gnu.org/pub/gnu/bash/bash-3.0.tar.gz		# original
    tar -xzf bash-3.0.tar.gz
    mv bash-3.0 bash

    wget http://home.eol.ca/~parkw/bashdiff.tar.gz		# my patch
    tar -xzf bashdiff.tar.gz

    cd bash
	patch -p1 < ../bash.diff
	autoconf
	./configure		# to pickup headers and libraries.

	cd examples/loadables/william
	    make		# --> william.so


To find out what is available,

    nm -D ./william.so | grep '_struct'

where 'xxx_struct' denotes that 'xxx' builtin is available for dynamic
loading.  If you have all libraries, then you should see 24 builtins.


To use it,

    enable -f ./william.so vplot	# loads 'vplot' as builtins
    help vplot
    vplot
    vplot  1 2 3 4 5 6

    enable -d vplot			# unloads 'vplot' 
    

Any feedback (like segfault :-) is greatly appreciated.  Enjoy!

-- 
William Park <opengeometry-FFYn/CNdgSA at public.gmane.org>
Open Geometry Consulting, Toronto, Canada
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