Retrieve all the JIRA issues between the tag and the previous tag. Optionally surround the issues with the JIRA url to the issues.

extractIssuesFromJira.sh

#!/bin/bash
# Finds all the strings looking as issues (e.g: ISSUE-123) in the commit log and returns its links
# The issues can optionally be surrounded with a prefix or a suffix to print issue tracker URLS.
# Issues ARE NOT expected to be found in the first position of the commit log (e.g: Merge feature branch 'feature/ISS-123')
#
# Example (extract issues between v1.2.3 and v1.2.2
# --------
# Input:
# extractIssuesFromJira.sh v1.2.3 'http://jira.url/browse/'
#
# Output:
# http://jira.url/browse/ISSUE-234
# http://jira.url/browse/ISSUE-233

if [ -z "$1" ]; then
    echo "ERROR: Reference tag not passed"
    echo ""
    echo "Usage example: "
    echo "bash $0 v069 'http://jira.url/browse/' '?source=bash'"
    exit 1
fi

TAG=$1
PREFIX=$2
SUFFIX=$3

PREV_TAG=$(git describe --tags --abbrev=0 "$TAG"^)
COMMITS=$(git --no-pager log --pretty=oneline "$TAG"..."$PREV_TAG" | grep -o -P '([A-Z]{1,6}-[0-9]+)')

# Construct the JIRA urls (or any other issue tracker)
if [ "$COMMITS" ]; then
    while IFS= read -r issue; do
        echo "${PREFIX}${issue}${SUFFIX}"
    done <<< "$COMMITS"
fi