DVM - D Version Manager

["Jérôme M. Berger"]

Jacob Carlborg wrote:
> On 2011-01-26 21:04, "Jérôme M. Berger" wrote:
>>     You cannot. You need to modify the environment for the current
>> shell, which is the shell that the user is currently using (no
>> matter what else may or may not be installed on the system). This
>> has two consequences:
>>
>> - You need to have some code that is run when the shell starts (i.e.
>> from .bashrc, .zshrc or .kshrc). That code will define the proper
>> aliases and/or functions (at the time being, this is mostly the
>> "dvm" function in "dvm.sh" (*)). This can be accomplished by having
>> a different version of this file for each shell;
> 
> Is it possible to detect what shell is running and then load the correct
> version?
> 
	Since each shell sources a different file on startup, you can
source the correct version from the startup file. On installation,
the SHELL environment variable should tell you which shell is used.

>> - You need to generate the contents of $dvm_result_path in a format
>> that the shell will understand. The easiest way to do that is
>> probably to define a few extra functions in "dvm.sh" to enable
>> setting environment variables in a portable way and handle
>> additional requirements (like "builtin hash -r" which is definitely
>> a bash-ism). Then generate the $dvm_result_path using these
>> functions instead of the normal shell syntax.
> 
> The contents of $dvm_result_path will only export one variable.
> 
	Do not you need to call "builtin hash -r" each time you change the
path (I do not know since I am not a bash user)? If not, why do you
need to call it in __dvm_setup_environment?

>>         Jerome
>>
>> (*) BTW, I hope you do not add the full contents of dvm.sh nor a
>> "source dvm.sh" in .bashrc the way it is now. Otherwise, a
>> misconfiguration may prevent the user from starting a shell!
> 
> OK, how else can I do the same thing? BTW this is how RVM (Ruby Version
> Manager) works, where I got the idea from. The whole RVM is written in
> shell script and it's sourced in .bashrc.
> 
	Remove the call to exit and wrap the rest of the file in a "if [[ !
-z "$dvm_prefix" ]] ; then ..." So the file will look like:

==============================8<------------------------------
if [[ -z "$dvm_prefix" ]] ; then

        if [[ -n "$HOME" ]] ; then
        dvm_prefix="$HOME/."
        else
        echo "No \$dvm_prefix was provided and "
        echo "$(id | \sed -e's/^[^(]*(//' -e 's/).*//') has no
\$HOME defined."
        fi
fi

if [[ ! -z "$dvm_prefix" ]] ; then
	...
fi
------------------------------>8==============================

		Jerome
-- 
mailto:jeberger at free.fr
http://jeberger.free.fr
Jabber: jeberger at jabber.fr

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