bundler and go suport for bash too

shell/go

@@ -0,0 +1,39 @@
+go_commands=(go)
+
+_go-installed() {
+  which go > /dev/null 2>&1
+}
+
+_within-go-project() {
+  local check_dir=$PWD
+  local next_check_dir=${check_dir%/*}
+  while [ "$next_check_dir" != "" ]; do
+    if [ -f "$check_dir/.gopath" ]; then
+        echo "$check_dir"
+        return
+    fi
+    check_dir="$next_check_dir"
+    next_check_dir=${check_dir%/*}
+  done
+  false
+}
+
+_run-with-gopath() {
+  local go_path
+  if _go-installed && go_path=$(_within-go-project); then
+    GOPATH="$go_path" $@
+  else
+    $@
+  fi
+}
+
+for cmd in ${go_commands[@]}; do
+  eval "function gopath_$cmd () { _run-with-gopath $cmd \$@; }"
+  alias $cmd=gopath_$cmd
+
+  if [[ -n $ZSH_VERSION ]]; then
+    if which _$cmd > /dev/null 2>&1; then
+      compdef _$cmd gopath_$cmd=$cmd
+    fi
+  fi
+done