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#!/usr/bin/env bash
# Usage: script/changelog [-r <repo>] [-b <base>] [-h <head>]
#
# repo: BASE string of GitHub REPOsitory url. e.g. "user_or_org/REPOsitory". Defaults to git remote url.
# base: git ref to compare from. e.g. "v1.3.1". Defaults to latest git tag.
# head: git ref to compare to. Defaults to "HEAD".
#
# Generate a changelog preview from pull requests merged between `base` and
# `head`.
#
# https://github.com/jch/release-scripts/blob/master/changelog
set -e
[ $# -eq 0 ] && set -- --help
while [[ $# > 1 ]]
do
key="$1"
case $key in
-r|--repo)
repo="$2"
shift
;;
-b|--base)
base="$2"
shift
;;
-h|--head)
head="$2"
shift
;;
*)
;;
esac
shift
done
repo="${repo:-$(git remote -v | grep push | awk '{print $2}' | cut -d'/' -f4- | sed 's/\.git//')}"
base="${base:-$(git tag -l | sort -t. -k 1,1n -k 2,2n -k 3,3n | tail -n 1)}"
head="${head:-HEAD}"
api_url="https://api.github.com"
# get merged PR's. Better way is to query the API for these, but this is easier
for pr in $(git log --oneline $base..$head | grep "Merge pull request" | awk '{gsub("#",""); print $5}')
do
# frustrated with trying to pull out the right values, fell back to ruby
curl -s "$api_url/repos/$repo/pulls/$pr" | ruby -rjson -e 'pr=JSON.parse(STDIN.read); puts "* #{pr[%q(title)]} {##{pr[%q(number)]}}[#{pr[%q(html_url)]}]"'
done
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