gem server launch agent

gem-servers

#!/usr/local/bin/bash -l

set -eo pipefail

declare -a GEM_SERVER_PIDS

function server_port {
  ruby_version="${1}"
  port_last_3="`echo "${ruby_version}" | sed 's/^ruby-\([0-9]\)\.\([0-9]\)\.\([0-9]\).*$/\1\2\3/'`"
  echo "8${port_last_3}"
}

function cleanup {
  # allow failures during cleanup, just let the script exit
  set +e

  for pid in ${GEM_SERVER_PIDS[@]}; do
    echo "Reaping child ${pid}..."
    kill "${pid}"
  done
}

trap cleanup EXIT

rubies="`chruby | tr -d '*' | awk '{print $1}'`"

while read -r ruby; do
  port="`server_port "${ruby}"`"

  echo "Launching Ruby ${ruby} at localhost:${port}..."
  chruby "${ruby}"
  gem server -p "${port}" &
  pid=$!

  GEM_SERVER_PIDS+=(${pid})
  echo "Launched ${pid}"
done <<< "${rubies}"

wait

org.ruby-lang.rdoc.plist

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
    <key>Label</key>
    <string>org.ruby-lang.rdoc</string>
    <key>ProgramArguments</key>
    <array>
      <string>/usr/local/bin/gem-servers</string>
    </array>
    <key>KeepAlive</key>
    <true/>
    <key>StandardOutPath</key>
    <string>/var/log/gem-servers.out.log</string>
    <key>StandardErrorPath</key>
    <string>/var/log/gem-servers.err.log</string>
</dict>
</plist>