From d257b562e54393ad37c5f58a39fe7512cc1abcb0 Mon Sep 17 00:00:00 2001
From: Sam Stephenson <sam@37signals.com>
Date: Tue, 2 Aug 2011 23:31:19 -0500
Subject: [PATCH] Add rbenv-whence to show you which versions of Ruby have a
 given command

---
 libexec/rbenv-whence | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)
 create mode 100755 libexec/rbenv-whence

diff --git a/libexec/rbenv-whence b/libexec/rbenv-whence
new file mode 100755
index 00000000..30613eed
--- /dev/null
+++ b/libexec/rbenv-whence
@@ -0,0 +1,22 @@
+#!/usr/bin/env bash -e
+
+if [ "$1" = "--path" ]; then
+  print_paths="1"
+  shift
+else
+  print_paths=""
+fi
+
+whence() {
+  local command="$1"
+  rbenv-versions --bare | while read version; do
+    path="$(rbenv-prefix "$version")/bin/${command}"
+    if [ -x "$path" ]; then
+      [ "$print_paths" ] && echo "$path" || echo "$version"
+    fi
+  done
+}
+
+RBENV_COMMAND="$1"
+result="$(whence "$RBENV_COMMAND")"
+[ -n "$result" ] && echo "$result"