JiraToolsKit is a macOS framework (written in swift) to communicate with the JIRA API. The command line jiratools uses the JiraToolsKit framework to communicate with JIRA. The framework is small and lightweight. It is in no way meant to be 100% complete towards the JIRA API - their API is huge - pull requests appreciated :)
Use Carthage
If you would like to try this but are hesitant to run it against your production JIRA instance, you can run a local development instance of Jira fairly easily. Follow the directions in the JiraLottadotTools project.
JiraToolsKit is released under the MIT License.
(c) 2016 Lottadot LLC. All Rights Reserved.