(patch for Bash) more ${var|...} expansions

[William Park]

Here are few parameter expansions that I added to ${var|...} notation:

    ${var|.strip}
	Strip leading/trailing whitespaces, and collapse consecutive
	whitespaces into one space.  Same as `echo $var`.
    ${var|.upper}
    ${var|.lower}
    ${var|.swapcase}
	Convert to uppercase or lowercase, or toggle the case.
    ${var|.capitalize}
	Convert the first char to uppercase, and the rest to lowercase.
    ${var|.rev}
	Flip strings, like rev(1).

Idea for the above came from Python string methods.  So, you can do

    a='abC  123'
    echo "${a|.strip}"		--> 'abC 123'
    echo "${a|.upper}"		--> 'ABC  123'
    echo "${a|.lower}"		--> 'abc  123'
    echo "${a|.swapcase}"	--> 'ABc  123'
    echo "${a|.capitalize}"	--> 'Abc  123'
    echo "${a|.rev}"		--> '321  Cba'


Also, added

    ${var|-regex}
	Remove all matching 'regex' pattern.  Comparable to ${var//glob}.
    ${var|+regex}
	Return only the matching 'regex' pattern.

So, you can delete or extract 'regex' from string, ie.

    a='abC  123'
    echo "${a|-[a-z]}"		--> 'C  123'
    echo "${a|+[a-z]}"		--> 'ab'


Ref:
    http://freshmeat.net/projects/bashdiff/
    http://home.eol.ca/~parkw/index.html#bash

Enjoy...

-- 
William Park <opengeometry-FFYn/CNdgSA at public.gmane.org>, Toronto, Canada
Slackware Linux -- because it works.


-- 
William Park <opengeometry-FFYn/CNdgSA at public.gmane.org>, Toronto, Canada
Slackware Linux -- because it works.
--
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