From: Duckz King_duckz <king_duckz@...>
Date: 2010-02-09T09:01:26+09:00
Subject: Working directory for external commands

Hello everyone, I've been searching on google for a while now but I
can't find any solution to my question. Basically I want to be able to
specify the working directory for any external command I might launch,
without using ugly globals :S
What I'm trying to write is a wrapper class for git. As a client, I want
to be able to write, for example:

[code]
git = GitWrapper.new
puts git.status
[/code]

and of course I don't want to know what's happening inside status().

In order to invoke git I'm doing `git status`, or `"c:/program
files/git/bin/sh.exe" -c "git status"`, depending on the OS and other
things. The problem is, backticks as well as %x, system and friends rely
on Dir.pwd, so in order to get a valid result from git I should do:
[code]
def status()
    Dir.chdir("some/dir") do
        return `git status`
    end
end
[/code]
which I'd rather avoid for its obvious fragility:
[code]
git = GitWrapper.new
a = Thread.new {10000.times do {Dir.chdir("some/other/dir");
do_some_work(); `rm -rf '*'`}}
puts git.status() # OMG!!!!!111
a.join
[/code]

Any suggestions?
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