Added Dockerfile + wrapping script, and updated README accordingly

Dockerfile

@@ -0,0 +1,20 @@
+FROM python:3.5-alpine  AS build-env
+
+# You can build the docker image with the command :
+# docker build --no-cache -t trainline .
+
+# You can create a container with :
+# docker run -it --rm trainline --departure="Toulouse" --arrival="Bordeaux" --next=12hours
+
+RUN pip install -U --no-cache-dir --target /app trainline \
+&& find /app | grep -E "(__pycache__|\.pyc|\.pyo$)" | xargs rm -rf
+
+FROM gcr.io/distroless/python3
+
+COPY --from=build-env /app /app
+
+ENV PYTHONPATH=/app
+ENV LC_ALL=C.UTF-8
+ENV LANG=C.UTF-8
+
+ENTRYPOINT ["python", "/app/bin/trainline_cli.py"]

README.md

@@ -3,6 +3,7 @@
 [![Travis](https://img.shields.io/travis/tducret/trainline-python.svg)](https://travis-ci.org/tducret/trainline-python)
 [![Coveralls github](https://img.shields.io/coveralls/github/tducret/trainline-python.svg)](https://coveralls.io/github/tducret/trainline-python)
 [![PyPI](https://img.shields.io/pypi/v/trainline.svg)](https://pypi.org/project/trainline/)
+[![Docker Image size](https://img.shields.io/microbadger/image-size/thibdct/trainline.svg)](https://hub.docker.com/r/thibdct/trainline/)
 ![License](https://img.shields.io/github/license/tducret/trainline-python.svg)
 
 ## Description
@@ -11,6 +12,8 @@ Non-official Python wrapper and CLI tool for Trainline
 
 I wrote a French blog post about it [here](https://www.tducret.com/scraping/2018/09/05/trouvez-le-billet-de-train-le-moins-cher-grace-a-ce-module-python.html)
 
+🎁 I added [a tiny Docker image](#docker) to use the tool very easily
+
 # Requirements
 
 - Python 3
@@ -110,6 +113,47 @@ departure_date;arrival_date;duration;number_of_segments;price;currency;transport
 [...]
 ```
 
+# Docker
+
+You can use the `trainline` tool with the [Docker image](https://hub.docker.com/r/thibdct/trainline/)
+
+You may execute :
+
+`docker run -it --rm thibdct/trainline --departure="Toulouse" --arrival="Bordeaux" --next=12hours`
+
+> The Docker image is built on top of [Google Distroless image](https://github.com/GoogleContainerTools/distroless), so it is tiny :)
+
+## 🤘 The easy way 🤘
+
+I also built a bash wrapper to execute the Docker container easily.
+
+Install it with :
+
+```bash
+curl -s https://raw.githubusercontent.com/tducret/trainline-python/master/trainline.sh \
+> /usr/local/bin/trainline && chmod +x /usr/local/bin/trainline
+```
+*You may replace `/usr/local/bin` with another folder that is in your $PATH*
+
+Check that it works :
+
+```bash
+trainline --help
+trainline --departure="Toulouse" --arrival="Bordeaux" --next=12hours
+```
+
+You can upgrade the app with :
+
+```bash
+trainline --upgrade
+```
+
+and even uninstall with :
+
+```bash
+trainline --uninstall
+```
+
 # TODO
 
 - [ ] Create a sort function in Folders class (to get the cheapest trips first for example)

trainline.sh

@@ -0,0 +1,45 @@
+#!/bin/sh
+
+# A wrapper script for invoking a docker container
+# Based on https://spin.atomicobject.com/2015/11/30/command-line-tools-docker/
+
+DOCKER_IMAGE="thibdct/trainline"
+
+error(){
+  error_code=$1
+  echo "ERROR: $2" >&2
+  exit $1
+}
+check_cmd_in_path(){
+  cmd=$1
+  which $cmd > /dev/null 2>&1 || error 1 "$cmd not found!"
+}
+upgrade(){
+  docker pull $DOCKER_IMAGE
+  exit 1
+}
+uninstall(){
+  read -p "Are you sure to uninstall (y/n)? " -n 1 -r
+  echo
+  if [[ $REPLY =~ ^[Yy]$ ]]
+  then
+    docker rmi $DOCKER_IMAGE
+    rm $0
+  fi
+  exit 1
+}
+
+# Checks for dependencies
+check_cmd_in_path docker
+
+case $1 in
+    --uninstall)
+    uninstall
+    ;;
+    --upgrade)
+    upgrade
+    ;;
+esac
+
+# Run our containerized command
+exec docker run -it --rm $DOCKER_IMAGE "$@"