From: Lionel Thiry <lthiry@...>
Date: 2004-10-14T00:40:23+09:00
Subject: [nuby] shell-like substitution in a string

Hi!

I'd like to make some kind of substitution like in a shell, i.e. having:
"${tool} -o ${target} -L${libpath} -l${lib} ${source}"

with an env like this:
env = {
"tool" => "gcc",
"target" => "hello.exe",
"libpath" => "/usr/lib",
"lib" => "somelib",
"source" => "hello.c"
}

it should give:
"gcc -o hello.exe -L/usr/lib -lsomelib hello.c"


It is easy until I want to manage caracter escapement like 
"${var\\}weird}" which should give env["var}weird"],  "\\${var}" which 
should give the simple string "${var}" and "\\\\${var}" which should be 
equivalent to "\\" + env["var"].

Any idea of how I could manage that?



Lionel Thiry