From 05f4cce44f1793b1a783c9d546a6d1f086ad0d28 Mon Sep 17 00:00:00 2001
From: Eric Nielsen <eric@amalgamar.com.br>
Date: Fri, 23 Jul 2021 17:28:06 -0500
Subject: [PATCH] fix: don't override existing ASDF_DIR

allowing users to define its value, e.g. when installed with homebrew.

Also unset locally used variables at the end.
---
 asdf.sh                    | 20 ++++++++++++--------
 test/version_commands.bats |  3 +++
 2 files changed, 15 insertions(+), 8 deletions(-)

diff --git a/asdf.sh b/asdf.sh
index 7450c183b..ff6ecfd91 100644
--- a/asdf.sh
+++ b/asdf.sh
@@ -3,16 +3,18 @@
 # For Bash, ${BASH_SOURCE[0]} will be used to obtain this script's path.
 # For Zsh and others, $0 (the path to the shell or script) will be used.
 _under="$_"
-if [ "${BASH_SOURCE[0]}" != "" ]; then
-  current_script_path="${BASH_SOURCE[0]}"
-elif [[ "$_under" == *".sh" ]]; then
-  current_script_path="$_under"
-else
-  current_script_path="$0"
-fi
+if [ -z "$ASDF_DIR" ]; then
+  if [ -n "${BASH_SOURCE[0]}" ]; then
+    current_script_path="${BASH_SOURCE[0]}"
+  elif [[ "$_under" == *".sh" ]]; then
+    current_script_path="$_under"
+  else
+    current_script_path="$0"
+  fi
 
+  ASDF_DIR="$(dirname "$current_script_path")"
+fi
 export ASDF_DIR
-ASDF_DIR="$(dirname "$current_script_path")"
 # shellcheck disable=SC2016
 [ -d "$ASDF_DIR" ] || echo '$ASDF_DIR is not a directory'
 
@@ -31,3 +33,5 @@ PATH="${ASDF_USER_SHIMS}:$PATH"
 # shellcheck source=lib/asdf.sh
 # Load the asdf wrapper function
 . "${ASDF_DIR}/lib/asdf.sh"
+
+unset _under current_script_path ASDF_BIN ASDF_USER_SHIMS
diff --git a/test/version_commands.bats b/test/version_commands.bats
index 35fcb7a3a..a0aef1fe7 100644
--- a/test/version_commands.bats
+++ b/test/version_commands.bats
@@ -21,6 +21,9 @@ setup() {
   mkdir -p $CHILD_DIR
 
   cd $PROJECT_DIR
+
+  # asdf lib needed to run asdf.sh
+  cp -rf $BATS_TEST_DIRNAME/../{bin,lib} $ASDF_DIR/
 }
 
 teardown() {