Create new release note generator using git and hub (doesnt need a te…

…mp git tag)

hack/gen-release-notes.sh

@@ -0,0 +1,43 @@
+#!/bin/bash
+
+PREVIOUS_TAG=${1}
+OPTIONAL_REF=${2}
+
+usage() {
+  echo "This script generates a starter release note document using `git` and `hub`."
+  echo "It finds all of the PR's with matching commits in the git log since the indicated ref."
+  echo "The PR's are link formatted with their title and author and are sorted by label."
+  echo
+  echo "usage:"
+  echo "  $0 <previous_tag>"
+  echo "  $0 <ref1> <ref2>"
+  echo
+  echo "examples:"
+  echo
+  echo "  $0 v0.7.1"
+  echo "  $0 v0.6.0 v0.7.0"
+}
+
+if ! [ "${1}" ]; then
+  usage
+  exit 1
+fi
+
+gh_prs() {
+  hub pr list -s closed \
+    --format "_commits_%sm_%sB_%sH_commits_ %l - %t ([%i](%U), [%au](https://github.com/%au))%n"
+}
+
+git_shas_since() {
+  git log --format="_%H_" "$1..$2"
+}
+
+grep_filter() {
+  printf "|%s" "$@" | sed 's/^|//'
+}
+
+gh_prs \
+  | grep -E "$(grep_filter $(git_shas_since ${PREVIOUS_TAG} ${OPTIONAL_REF}))" \
+  | sed 's/^_commits_[^ ]*_commits_//' \
+  | sort -r  `# reverse sort puts all of the un-labelled PR's at the bottom`
+