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prezto/modules/git/functions/git-hub-shorten-url

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#
# Shortens GitHub URLs.
#
# Authors:
# Sorin Ionescu <sorin.ionescu@gmail.com>
#
local url="$1"
if [[ "$url" == '-' ]]; then
read url <&0
fi
if [[ -z "$url" ]]; then
print "usage: $0 [ url | - ]" >&2
fi
if (( $+commands[curl] )); then
curl -s -i 'http://git.io' -F "url=$url" | sed -n 's/^Location: //p'
else
print "$0: command not found: curl" >&2
fi