My question is really as it is stated in the title.
I use MacOSX and the Acquia Developer Desktop for running my Drupal sites that I develop locally.
I'd love to try out the new Drush 7, but I can't get it to 'upgrade' from Drush 6 to Drush 7.
I've tried:
Ofcourse, when entering "drush" I get the message that I should have used Composer instead.
Installing with composer seems to work, but it doesn't install Drush 7 in my Application/Dev Desktop(/drush) folder, so it's of no use to me.
How do I force Composer to put drush in this specific directory? I get confused by all the configuration files and what to put in them. Is there something like > composer install drush --right-here ?
EDIT
After Clide's helpful answer, I get Drush version 7 running. I checked the version using "drush version". However, when I try a real drush command ( drush en -gmap, in this case), I get the notorious "Command pm-enable needs a higher bootstrap level to run" error.
I invoke the command line from within the Acquia application, so the PATH should be correct. I also tried specifying the URI, and also that looks okay. I'll copy some of the output, if that helps.
Drupal version : 7.26
Site URI : http://(sitename).local:8083
PHP executable : /usr/local/bin/php
PHP configuration : /usr/local/etc/php/5.3/php.ini
PHP OS : Darwin
Drush version : 7.0-dev
Drush temp directory : /tmp
Drush configuration :
Drush alias files :
Drupal root : /Users/(myname)/Documents/(dev folder)/(sitename)
Site path : sites/(sitename).local
In this context Composer is used to fetch the libraries Drush needs, it doesn't download Drush itself. Running the install process in the Drush root should do the trick:
git clone https://github.com/drush-ops/drush.git drush
cd drush
composer install
and if you don't already have it
ln -s /path/to/drush/drush /usr/local/bin/drush # or wherever