pypi-version 0.2.0
Check if you haven't forgotten to bump the PyPi package version number before you merge a release pull request.
License: MIT

# pypi-version

[![Release](https://img.shields.io/github/release/dmytrostriletskyi/pypi-version.svg)](https://github.com/dmytrostriletskyi/pypi-version/releases)
[![PyPI version shields.io](https://img.shields.io/pypi/v/pypi-version.svg)](https://pypi.python.org/pypi/pypi-version/)
[![Build Status](https://travis-ci.com/dmytrostriletskyi/pypi-version.svg?branch=develop)](https://travis-ci.com/dmytrostriletskyi/pypi-version)
[![codecov](https://codecov.io/gh/dmytrostriletskyi/pypi-version/branch/develop/graph/badge.svg)](https://codecov.io/gh/dmytrostriletskyi/pypi-version)

[![Downloads](https://pepy.tech/badge/pypi-version)](https://pepy.tech/project/pypi-version)
[![PyPI license](https://img.shields.io/pypi/l/pypi-version.svg)](https://pypi.python.org/pypi/pypi-version/)
[![PyPI pyversions](https://img.shields.io/pypi/pyversions/pypi-version.svg)](https://pypi.python.org/pypi/pypi-version/)

  * [Getting started](#getting-started)
    * [How to install](#how-to-install)
    * [What is pypi-version](#what-is-pypi-version)
    * [Motivation](#motivation)
    * [Examples](#examples)
  * [Usage](#usage)
    * [Command line interface](#command-line-interface)
    * [Configuration file](#configuration-file)
    * [Continuous integration services](#continuous-integration-services)
      * [Travis-CI](#travis-ci)
      * [CircleCI](#circleci)
  * [Contributing](#contributing)
  * [References](#references)
    * [Python package](#python-package)
    * [Gitflow workflow](#gitflow-workflow)
    * [Upload to PyPi](#upload-to-pypi)
    * [Continuous integration services](#references-continuous-integration-services)

## Getting started

### How to install

Install the `pypi-version` with the following command using `pip3`:

```bash
$ pip3 install pypi-version
```

### What is pypi-version

``pypi-version`` checks if you haven't forgotten to bump the ``PyPi package version number`` before you merge a release 
pull request. 

It would be useful if you:

* develop [Python package](https://packaging.python.org/overview/),
* follow [Gitflow workflow](https://www.atlassian.com/git/tutorials/comparing-workflows/gitflow-workflow),
* upload package to the [Python Package Index (PyPi)](https://pypi.org/),
* use the following continuous integration services: [Travis-CI](https://travis-ci.com), [CircleCI](https://circleci.com)

If you do not know these concepts, go ahead to the [references section](https://github.com/dmytrostriletskyi/pypi-version/tree/develop#references) first. After, start reading from the next section.

### Motivation

`Python packages` have version number such as `0.1.0` or `1.3.3`. `Python packages` commonly are uploaded to `PyPi`.
Sometimes after adding new functionality to your package you forget to increase the version number of the package. 
So when you try to upload it, you get the error message `Package version number already in use`. It is okay if 
you develop the package locally and alone, you just modify the version number and upload it again. But if you 
develop the package using particular development flow such as `Gitflow workflow` and continuous integration 
services — then you should create separated pull request to bump the version, the resources and time you will spend 
on it are increasing in few times. The cost of the mistake is high.

So if you integrate the `pypi-version` to your continuous integration service by checking the version using simple command line tool, it will `never` allow your pull request to be merged if you forget to increase the version.

### Examples

There is the test repository of the ``Python package`` that has integrated `pypi-version` — [test-pypi-version-travis-ci](https://github.com/dmytrostriletskyi/test-pypi-version-travis-ci). It uses `Travis CI` as continuous integration service.

It contains:

* `develop` and `master` branches,
* `master` branch contains file [setup.py where version is 0.1.0](https://github.com/dmytrostriletskyi/test-pypi-version-travis-ci/blob/master/setup.py#L7),

![Version number in the setup.py](https://habrastorage.org/webt/du/wa/ox/duwaox015d_cim8_wd58gvkmem0.png)

* according to the version number in the `master` branch (release branch), package is [uploaded to the PyPi with version 0.1.0](https://pypi.org/project/test-pypi-version-travis-ci/),

![Version number on the PyPi](https://habrastorage.org/webt/q_/qb/fz/q_qbfzof0fdbg-thoq-l7y4bizi.png)

* there is a [pull request from develop branch to master branch](https://github.com/dmytrostriletskyi/test-pypi-version-travis-ci/pull/1) — it is a release pull request that intend increasing of the version number,

![Release pull request](https://habrastorage.org/webt/bo/1k/by/bo1kbyddvba5lvlhtpj9bprhadc.png)

* but in the changes [version number in setup.py isn't increased](https://github.com/dmytrostriletskyi/test-pypi-version-travis-ci/pull/1/files#diff-2eeaed663bd0d25b7e608891384b7298R8),

![Not increased version number in the setup.py](https://habrastorage.org/webt/yw/o_/iz/ywo_izjqiydy9nyaxfpqbjhtrik.png)

* that's because [pull request's continuous integration checking](https://travis-ci.com/dmytrostriletskyi/test-pypi-version-travis-ci/builds/107324550) is failed — there is `pypi-version` checking integrated.

![CI failed](https://habrastorage.org/webt/ou/nm/dp/ounmdpsu45gtdtikovraqpd27cs.png)

* as configured, there are an [installing of the pypi-version and checking the version by using it](https://github.com/dmytrostriletskyi/test-pypi-version-travis-ci/blob/master/.travis.yml),

![Travis CI configuration file](https://habrastorage.org/webt/2k/wo/yv/2kwoyvxdvvpuj2_fk1ykp2ov5b4.png)

* as the result, `pypi-version` [checks](https://travis-ci.com/dmytrostriletskyi/test-pypi-version-travis-ci/jobs/190875378#L482) if release pull request's (from `develop` to `master`) changes contain an increasing the ``package version number`` before it will be merged. In the example that is described above there is no increasing the version — 
`pypi-version check` is failed. If one of the declared checking in the configuration file is failed — it means pull request continuous integration checking is failed and pull request does not allowed to be merged with wrong version number.

![PyPi version checking](https://habrastorage.org/webt/hj/en/k8/hjenk81ytwmjcmmbytthtmlloq8.png)

## Usage

### Command line interface

To check if you haven't forgotten to bump the ``PyPi package version number`` before you merge a release 
pull request:

```bash
$ pypi-version check
```

To fetch the version of the `pypi-version` package:

```bash
$ pypi-version --version
pypi-version, version 0.1.0
```

To fetch all available package commands, use the following command:

```bash
$ pypi-version --help
Usage: pypi-version [OPTIONS] COMMAND [ARGS]...

  Command line interface for PyPi version checking.

Options:
  --version  Show the version and exit.
  --help     Show this message and exit.

Commands:
  check  Check if you haven't forgotten to bump the PyPi package version.
```

### Configuration file

`pypi-version` requires a configuration file called `.pypi-version.yml` to be located in the root of the project:

```
package
 |
 - ...
 - source
 - README.md
 - setup.py
 - .pypi-version.yml
 ...
```

The configuration file should contains:

* the section with your `PyPi package name` that is the same with the name in the `setup.py`:

```yml
package:
  name: test-pypi-version-travis-ci
```

* name of the continuous integration service you use. Available options are: `travis`.

```yml
ci:
  name: travis
```

* `development` and `release` branch names. In the configurations which are illustrated below means 
`package version number` will be checked only when you do a pull request from `develop` to `master`.

```yml
branches:
  development: develop
  release: master
```

The full example of the configuration file is:

```yml
package:
  name: pypi-version

ci:
  name: travis

branches:
  development: develop
  release: master
```

### Continuous integration services

#### Travis-CI

The example of the configuration file which install and use `pypi-version`:

```yml
language: python

python:
  - "3.6"

install:
  - pip install pypi-version

script:
  - pypi-version check
```

The example of the failed build (version hasn't been bumped):

![The example of the Travis-CI failed build](https://habrastorage.org/webt/1p/4o/pk/1p4opk_pzxswouvdd0ooioj8o7w.png)

#### CircleCI

The example of the configuration file which install and use `pypi-version`:

```yml
version: 2
jobs:
  build:
    docker:
      - image: circleci/python:3.6.4
    steps:
      - checkout
      - run:
          name: Install pypi-version package
          command: sudo pip3 install pypi-version
      - run:
          name: Check if PyPi should be bumped
          command: sudo -H -E pypi-version check
```

The example of the failed build (version hasn't been bumped):

![The example of the CircleCI failed build:](https://habrastorage.org/webt/bf/pq/uh/bfpquh7yta1w-__0yblr7jmbaau.png)

## Contributing

Clone the project and install requirements:

```bash
$ git clone git@github.com:dmytrostriletskyi/pypi-version.git && cd pypi-version
$ pip3 install -r requirements.txt
$ pip3 install -r requirements-dev.txt
$ pip3 install -r requirements-tests.txt
```

When you will make changes, ensure your code pass [the checkers](https://github.com/dmytrostriletskyi/pypi-version/blob/develop/.travis.yml#L15) and is covered by tests using [pytest](https://docs.pytest.org/en/latest).

If you are new for the contribution, please read:

* Read about pull requests — https://help.github.com/en/articles/about-pull-requests
* Read how to provide pull request — https://help.github.com/en/articles/creating-a-pull-request-from-a-fork
* Also the useful article about how to contribute — https://akrabat.com/the-beginners-guide-to-contributing-to-a-github-project/

## References

### Python package

`Python package` is redistributed and reused couple of the `Python` scripts. They exist to solve the typical problems. So if
you have common problem in your project — instead of writing own code and spend a time for it, use the package that already have required functionality. The examples of `Python packages` you should know are [requests](https://github.com/kennethreitz/requests) and [Django](https://github.com/django/django). 

### Gitflow workflow

Instead of a single `master` branch, this workflow uses two branches to record the history of the project. The `master` branch stores the official release history, and the `develop` branch serves as an integration branch for features.

<img src="https://wac-cdn.atlassian.com/dam/jcr:a9cea7b7-23c3-41a7-a4e0-affa053d9ea7/04%20(1).svg?cdnVersion=le" width="700" height="300">

So when you complete the feature, you open the pull request from `feature` branch to the `develop` branch. When you complete the bunch of features, you open the pull request from `develop` branch to `master` branch which are going to merge this bunch of features that means you do new release. 

![Example of the release pull request](https://habrastorage.org/webt/xu/j2/e8/xuj2e8giwaniunm0fnvh9bztb8m.png)

According to the changes that contains new features, you should increase your version number (e.g. from `1.0.0` to `1.1.0`) in the file called `setup.py` in the same pull request. 

![Increase version in setup.pt](https://habrastorage.org/webt/m7/er/rj/m7errjk5h7bkaztm95ibhgjyfai.png)

### Upload to PyPi

When your features with increased version number have been merged to the `master` branch, you are going to upload your source code to the `Python Package Index`. 

Being in the root of you project,

```
package
 |
 - ...
 - source
 - README.md
 - setup.py
 ...
```

you do the following command:

```
$ python3 setup.py sdist
$ twine upload dist/*
```

And if you haven't forgotten to bump the ``PyPi package version number``, the upload is successful. 

<img src="https://habrastorage.org/webt/55/pk/jn/55pkjnoezzvidqcyordvtyyhgw0.png" width="700" height="300">

<h3 id="references-continuous-integration-services">Continuous integration services</h3>

Continuous integration services are useful when you want add some robotic checking for your pull request changes. 
For instance, you can run checking code style with [flake8](https://github.com/PyCQA/flake8) and run tests with [pytest](https://github.com/pytest-dev/pytest) to check your changes does not break existing functionality on the few version 
of `Python`. The configuration file example for `Travis CI` is presented below.

```yml
language: python

python:
  - "3.4"
  - "3.5"
  - "3.6"
  - "3.7-dev"

install:
  - pip install -r requirements-dev.txt
  - pip install -r requirements-tests.txt

script:
  - cat requirements-tests.txt requirements-dev.txt | safety check --stdin
  - radon cc accessify -nb --total-average
  - isort -rc accessify --diff && isort -rc tests --diff
  - flake8 accessify
  - coverage run -m pytest -vv tests

after_success:
  - coverage report -m && coverage xml
  - bash <(curl -s https://codecov.io/bash)
```

Each pull request the checking report will be presented. By clicking on the `details` you will see full report.

![Pull request checks](https://habrastorage.org/webt/jj/ux/1b/jjux1b8mezmnnf8g8zq3elr9fv8.png)