Utility to scan ascendant directories for .go-root files, add those directories to the GOPATH, then forward arguments to the next go command in the PATH.

go

#!/bin/sh

# Puts any directory with a .go-root file into the GOPATH then launches go.

__gopath_for_dir__() {
  test_goroot="$1/.go-root"
  if [[ -f "$test_goroot" ]] ; then
    echo "${2:+$2:}$1"
  else
    echo "$2"
  fi
}

GOPATH_ASCENDANT=""

test_dir="$(pwd)"
until [[ "$test_dir" == "/" ]] ; do
  GOPATH_ASCENDANT="$(__gopath_for_dir__ "$test_dir" "$GOPATH_ASCENDANT")"
  test_dir="$(dirname "$test_dir")"
done
GOPATH_ASCENDANT="$(__gopath_for_dir__ "$test_dir" "$GOPATH_ASCENDANT")"
export GOPATH="$GOPATH_ASCENDANT${GOPATH_ASCENDANT:+${GOPATH:+:}}$GOPATH"


GOBIN="$(which -a go | sed -e '2q;d')"

# check for gopath args
while [[ 1 ]] ; do
  if [[ "$1" == "--go-bin-path" ]] ; then
    GOBIN="$2"
    shift; shift
    continue
  elif [[ "$1" == "--echo-gopath" ]] ; then
    echo "GOPATH='$GOPATH'" 1>&2
    shift
    continue
  elif [[ "$1" == "--echo-gobin" ]] ; then
    echo "GOBIN='$GOBIN'" 1>&2
    shift
    continue
  fi
  break
done

if [[ -x "$GOBIN" && "$GOBIN" != "$0" ]] ; then
  "$GOBIN" $*
else
  echo "No valid 'go' executable in PATH -- tried '$GOBIN'" 1>&2
  exit 1
fi