Add Changelog script

generate_changelog.sh

@@ -0,0 +1,96 @@
+#!/usr/bin/env bash
+set -e
+
+# default arguments
+host="https://github.com"
+api_host="https://api.github.com"
+origin="sendgrid"
+repo="sendgrid-python"
+authorization_token=""
+
+# helpers
+usage() {
+  cat << EOF
+Usage:
+  generate_changelog [-h]
+  generate_changelog [-t]
+  generate_changelog [-v]
+
+Options:
+  -h        Print usage information
+  -t        Specify a token to authenticate with the api that gets PR titles
+            May also set the AUTHORIZATION_TOKEN environment variable
+  -v        Specify the new version number
+EOF
+}
+
+create_changelog() {
+
+  content=""
+  # Get merge commits
+  merges="$(git log ${latest_release}..HEAD --merges --format="* %s (%h)" --grep="^Merge pull request #" | cut -d "#" -f2 | cut -d " " -f1)"
+  for pr in $merges; do
+    echo "Getting title of PR #$pr"
+    url="$host/$origin/$repo/pull/$pr"
+    api_url="$api_host/repos/$origin/$repo/pulls/$pr"
+    curl_command="curl -s $api_url"
+    if [ -n "$authorization_token" ]
+      then
+        curl_command="$curl_command -H \"Authorization: token $authorization_token\""
+    fi
+    title=$(eval $curl_command | grep '"title": ' | cut -d '"' -f4)
+    content="$content- [PR #$pr]($url): $title\n"
+  done
+
+  # Output changelog
+  echo | awk -v v_header1="## [$version] - $(date +'%Y')-$(date +'%m')-$(date +'%d') ##" \
+  -v v_header2="### Added" \
+  -v v_content="$content" \
+  '/All notable changes to this project will be documented in this file/{print;print v_header1;print v_header2;print v_content;next}1' CHANGELOG.md \
+  > CHANGELOG.md.temp
+  mv -f CHANGELOG.md.temp CHANGELOG.md
+}
+
+
+# script
+
+# Exit if not in a Git repository.
+if [ "true" != "$(git rev-parse --is-inside-work-tree 2> /dev/null)" ]
+  then
+    echo -e "This does not seem to be a Git repository.\n"
+    exit
+fi
+
+# Parse all options
+while [ "$1" != "" ]; do
+    case $1 in
+        -h | --help )           usage
+                                exit
+                                ;;
+        -t | --token )          shift
+                                authorization_token=$1
+                                ;;
+        -v | --version )        shift
+                                version=$1
+                                ;;
+        * )                     usage
+                                exit 1
+    esac
+    shift
+done
+
+# Validate options
+if [ -z "$version" ]
+  then
+    echo "Must supply a version with -v"
+    exit 1
+fi
+if [ -z "$authorization_token" ]
+  then
+    authorization_token="$AUTHORIZATION_TOKEN"
+fi
+
+# Generate changelog from last tag
+latest_release="$(git describe --tags --abbrev=0)"
+create_changelog
+echo "Successfully wrote to CHANGELOG.md"