Get commits since last tag in pretty format

git-log.bash

# Make sure you run this in valid git repository

git log $(git describe --tags --abbrev=0)..HEAD --pretty=format:'@begin@%s@space@%B@end@'  > new-in-this-release.log

# You can use following formats below to modify your --pretty output
# {
#    hash: "%H",
#    abbrevHash: "%h",
#    treeHash: "%T",
#    abbrevTreeHash: "%t",
#    parentHashes: "%P",
#    abbrevParentHashes: "%P",
#    authorName: "%an",
#    authorEmail: "%ae",
#    authorDate: "%ai",
#    authorDateRel: "%ar",
#    committerName: "%cn",
#    committerEmail: "%ce",
#    committerDate: "%cd",
#    committerDateRel: "%cr",
#    subject: "%s",
#    body: "%b",
#    rawBody: "%B",
#  }