#!/bin/bash
set -o errexit -o nounset -o pipefail

function main {
  case "${1:-${TRAVIS_OS_NAME:-}}" in
    osx)   osx ;;
    *)     echo "No handler for: ${1:-}" >&2
  esac
}

function osx {
  BREW_LOG=brew.log
  brew update > "$BREW_LOG"
  brew remove postgresql >> "$BREW_LOG"
  brew upgrade >> "$BREW_LOG"
}


##################################################################### Utilities

function msg { out "$*" >&2 ;}
function err { local x=$? ; msg "$*" ; return $(( $x == 0 ? 1 : $x )) ;}
function out { printf '%s\n' "$*" ;}

# Handles "no-match" exit code specified by POSIX for filtering tools.
function maybe { "$@" || return $(( $? == 1 ? 0 : $? )) ;}


######################### Delegates to subcommands or runs main, as appropriate

if declare -f -- "${1:-}" >/dev/null
then "$@"
else main "$@"
fi