Travis CI setup for Nim

.travis.yml

os:
  - windows
  - linux
  - osx

language: c

env:
  - BRANCH=0.19.6
  - BRANCH=0.20.2
  - BRANCH=1.0.4
  - BRANCH=devel

cache:
  directories:
    - "$HOME/.choosenim"
    - "$TRAVIS_BUILD_DIR/git"

install:
  - curl https://gist.github.com/genotrance/fb53504a4fba88bc5201d3783df5c522/raw/3122ece117489afcc9008b63d6278d97074b8f2c/travis.sh -LsSf -o travis.sh
  - source travis.sh

script:
  - nimble develop -y
  - nimble test

travis.sh

#! /bin/bash

export CHOOSENIM_NO_ANALYTICS=1
export PATH=`pwd`/git/bin:$HOME/.nimble/bin:$PATH

if ! type -P choosenim &> /dev/null; then
  mkdir -p git/bin
  if [[ "$TRAVIS_OS_NAME" == "windows" ]]; then
    # Setup git outside "Program Files", space breaks cmake sh.exe
    cd git
    curl -L -s "https://github.com/git-for-windows/git/releases/download/v2.23.0.windows.1/PortableGit-2.23.0-64-bit.7z.exe" -o portablegit.exe
    7z x -y -bd portablegit.exe
    cd ..

    # Latest choosenim binary doesn't have
    #   https://github.com/dom96/choosenim/pull/117
    #   https://github.com/dom96/choosenim/pull/135
    #
    # Using custom build with these PRs for Windows
    curl -L -s "https://bintray.com/genotrance/binaries/download_file?file_path=choosenim.exe" -o choosenim.exe
    curl -L -s "https://bintray.com/genotrance/binaries/download_file?file_path=libeay32.dll" -o libeay32.dll
    curl -L -s "https://bintray.com/genotrance/binaries/download_file?file_path=ssleay32.dll" -o ssleay32.dll
    ./choosenim.exe $BRANCH -y
    cp ./choosenim.exe `pwd`/git/bin/.
  else
    export CHOOSENIM_CHOOSE_VERSION=$BRANCH
    curl https://nim-lang.org/choosenim/init.sh -sSf > init.sh
    sh init.sh -y
    cp $HOME/.nimble/bin/choosenim `pwd`/git/bin/.
  fi
fi

if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then
  # Work around https://github.com/nim-lang/Nim/issues/12337 fixed in 1.0+
  ulimit -n 8192
fi