srcinto your shaarli instance (at its root with index.php)
tumblr = xxx.tumblr.com # your tumblr URL (can be another domain if you paid for it) api_key = xxx # your tumblr's API key (see below) private = true # if links should be private or public shaarli_dir = # leave blank if you followed this tutorial, else, the path to shaarli
You need to register an app in tumblr :
Register an application
website(even if it's not marked as mandatory, trust me, it is)
Tumblr's API can only retrieve 20 × 250 posts (I did the math, it's 5000)
This script does not resume import, so if you got more than 5k posts, it won't work.