A command line executable to add a file to IPFS from a URL instead of a file path
Make sure IPFS is installed and the daemon running
ipfs daemon
Globally
npm install -g ipfs-add-from-url
# Use anywhere
ipfs-add-from-url https://inventaire.io/public/icon/120.png
In a project
npm install ipfs-add-from-url --save
# Use directly from npm scripts
ipfs-add-from-url https://inventaire.io/public/icon/120.png
# Or using the relative path from the command line
./node_modules/.bin/ipfs-add-from-url https://inventaire.io/public/icon/120.png
As suggested by ftnd33, you can do pretty much the same with
wget -q -O - http://url.tld | ipfs add -q