Use pipenv for local development, instead of requirements files. (kensho-technologies#147)

* Use pipenv for local development, instead of requirements files.

* Update Travis file to account for pipenv.

* Use deploy and system flags for pipenv.

* Install dev requirements in travis build.

* Do not invoke shell script via pipenv run.

* Add printout of current directory to error message.

* Instead of raising an error, cd to the git repo root.

* Use cd instead of pushd.

* Mention "docker-compose up" in the getting started guide.

Author: obi1kenobi

.travis.yml

@@ -5,33 +5,35 @@ dist: xenial
 services:
   - docker
 install:
-  - pip install -r dev-requirements.txt
-  - pip install -e .
+  - pip install --upgrade pip
+  - pip install --upgrade setuptools pipenv
+  - pipenv install --dev --deploy --system
+  - pipenv install --system --skip-lock -e .
 before_script:
   - docker-compose up -d
 matrix:
   include:
   - name: "Lint and static analysis"
     python: "3.6"
     script:
-      - ./scripts/copyright_line_check.sh
-      - isort --check-only --verbose --recursive graphql_compiler/
-      - flake8 --config=setup.cfg graphql_compiler/
-      - pydocstyle graphql_compiler/
-      - pylint graphql_compiler/
-      - bandit -r graphql_compiler/
+      - pipenv run ./scripts/copyright_line_check.sh
+      - pipenv run isort --check-only --verbose --recursive graphql_compiler/
+      - pipenv run flake8 --config=setup.cfg graphql_compiler/
+      - pipenv run pydocstyle graphql_compiler/
+      - pipenv run pylint graphql_compiler/
+      - pipenv run bandit -r graphql_compiler/
   - name: "Python 2.7 unit tests"
     python: "2.7"
     script:
-      - py.test --cov=graphql_compiler graphql_compiler/tests
+      - pipenv run py.test --cov=graphql_compiler graphql_compiler/tests
   - name: "Python 3.6 unit tests"
     python: "3.6"
     script:
-      - py.test --cov=graphql_compiler graphql_compiler/tests
+      - pipenv run py.test --cov=graphql_compiler graphql_compiler/tests
   - name: "Python 3.7 unit tests"
     python: "3.7"
     script:
-      - py.test --cov=graphql_compiler graphql_compiler/tests
+      - pipenv run py.test --cov=graphql_compiler graphql_compiler/tests
 after_success:
   - docker-compose down
   - coveralls

CONTRIBUTING.md

@@ -2,10 +2,14 @@
 
 Thank you for taking the time to contribute to this project!
 
-To get started:
+To get started, make sure that you have `pipenv`, `docker` and `docker-compose` installed
+on your computer.
+
+Then, from the root of the repository, run:
 ```
-pip install -r dev-requirements.txt
-pip install -r requirements.txt
+docker-compose up -d
+pipenv sync --dev
+pipenv shell
 
 py.test graphql_compiler/tests
 ```
@@ -31,7 +35,8 @@ of both the contributors and the project.
 This project follows the
 [Google Python style guide](https://google.github.io/styleguide/pyguide.html).
 
-Additionally, any contributions must pass the following set of lint and style checks with no issues:
+Additionally, any contributions must pass the following set of lint and style checks with no issues
+when executed from a pipenv shell (i.e. after running `pipenv shell`):
 ```
 isort --check-only --verbose --recursive graphql_compiler/
 

Pipfile

@@ -0,0 +1,27 @@
+[[source]]
+name = "pypi"
+url = "https://pypi.org/simple"
+verify_ssl = true
+
+[dev-packages]
+bandit = "==1.4.0"
+coveralls = "==1.2.0"
+flake8 = "==3.5.0"
+isort = "==4.3.4"
+pydocstyle = "==2.1.1"
+pylint = "==1.8.2"
+pyorient = "==1.5.5"
+pytest = "==3.4.1"
+pytest-cov = "==2.5.1"
+snapshottest = "==0.5.0"
+
+[packages]
+arrow = "==0.10.0"
+funcy = "==1.7.3"
+graphql-core = "==1.1"
+pytz = "==2017.2"
+six = "==1.10.0"
+sqlalchemy = "==1.2.9"
+
+[requires]
+python_version = "3.6"