prs_since_last_release.sh

#!/bin/zsh

### Actions

# - git checkout master
# - git pull --rebase
# - List the PRs that have been merged to master since the last tag (according to git describe)

# ### Usage:

# ./PRs_since_last_release.sh

# ### Requirements

# Must be run in the gospotcheck project's root directory
# User must have permission to pull and push the gospotcheck repo
# GITHUB_API_TOKEN env variable must be set
# TRACKER_API_TOKEN env variable must be set

# ### Error Conditions. The script will print an error message and exit for the following reasons:

# - API token env variables not set
# - any of the git commands fail
# - No PRs merged to master since last release

# ### Limitations

# If more than 1 Tracker story is listed in a PR, only the first will be shown

###### Constants
RED='\033[0;31m'
CYAN='\033[0;36m'
NC='\033[0m' # No Color

######## Start script
    if [ -z $TRACKER_API_TOKEN ];then
      echo "${RED}You need to set the TRACKER_API_TOKEN env variable. Exiting.${NC}"
      exit 1;
    fi
    if [ -z $GITHUB_API_TOKEN ];then
      echo "${RED}You need to set the GITHUB_API_TOKEN env variable. Exiting.${NC}"
      exit 1;
    fi

    echo "${CYAN}>>>Checking out the gospotcheck master branch...${NC}"
    git checkout master
    if [ "$?" -ne 0 ]; then
      echo "${RED}checkout master failed. Make sure you are in the gospotcheck directory. Exiting."
      exit 1
    fi
    echo

    echo "${CYAN}>>>Pulling down the contents of the gospotcheck master branch...${NC}"
    git pull --rebase
    if [ "$?" -ne 0 ]; then
      echo "${RED}pull failed. Exiting."
      exit 1
    fi
    echo
    
    last_release_tag=$(git describe --abbrev=0 --tags) # gets last tag from current branch
    git log "$last_release_tag"..HEAD --merges --oneline | grep "pull request" > /dev/null
    if [ "$?" -eq 1 ]; then
      echo "${RED}No pull requests have been merged since the $last_release_tag. Exiting."
      exit 0
    fi

    echo "${CYAN}>>>The following PRs have been merged to master since the $last_release_tag:${NC}"
    printf "%s      %s                                    %s\n" "PR" "Tracker Story Link" "Tracker Story Title"
    git log "$last_release_tag"..HEAD --merges --oneline | grep "pull request" | grep -v "gospotcheck/master" | cut -d'#' -f2 | cut -d' ' -f1 | sort | while read pr_num; do
      tracker_story_link=$(curl -s -H "Authorization: token $GITHUB_API_TOKEN" https://api.github.com/repos/gospotcheck/gospotcheck/pulls/$pr_num | grep body | sed s/"\["//g | sed s/"\]"//g | grep -o 'https:\/\/www.pivotaltracker.com\/story\/show\/[0-9]*' | head -1)
    
      if [ -z "$tracker_story_link" ]; then
        tracker_story_link="Tracker link not found in PR!                      "
        tracker_story_title=""
      else
        tracker_story_number=`echo $tracker_story_link | rev | cut -d"/" -f1 | rev`
        tracker_story_title=$(curl -s -X GET -H "X-TrackerToken: $TRACKER_API_TOKEN" https://www.pivotaltracker.com/services/v5/stories/$tracker_story_number | sed '/name/s/\\"//g' | grep -o '"name":"[^"]*' | head -1 | cut -d"\"" -f4)
        if [ -z "$tracker_story_title" ]; then
          tracker_story_title="NO Story title"
        fi
      fi
      printf "#%s   %s   %s\n" "$pr_num" "$tracker_story_link" "$tracker_story_title"
    done