feat: use asdf exec-env to set CLOUDSDK_PYTHON on each gcloud cmd… (#14)

* feat: use asdf exec-env to set CLOUDSDK_PYTHON on each gcloud cmd use

* feat: enforce bash strict mode

* fix: unset var with bash strict mode

README.md

@@ -21,12 +21,6 @@
 # Dependencies
 
 - `bash`, `curl`, `tar`, `python`
-- `CLOUDSDK_PYTHON`: set this environment variable in your shell config to load the correct version of Python.
-
-  ```shell
-  python_sdk="$(command -v python)"
-  export CLOUDSDK_PYTHON="${python_sdk}"
-  ```
 
 # Install
 

bin/exec-env

@@ -0,0 +1,15 @@
+#!/usr/bin/env bash
+
+set -euo pipefail
+
+if [[ ! -x "$(command -v python)" ]]; then
+    printf "🚨  Python not found and is required for gcloud. Might I suggest https://github.com/danhper/asdf-python\\n"
+    exit 1
+fi
+
+# stolen from https://unix.stackexchange.com/a/56846/397902
+if [ -z "${CLOUDSDK_PYTHON:+1}" ]; then
+    # undefined or defined and empty
+    python_sdk="$(command -v python)"
+    export CLOUDSDK_PYTHON=${python_sdk}
+fi

bin/install

@@ -33,7 +33,6 @@ extract() {
 
 install_gcloud() {
     printf "🚧  installing...\\n"
-    printf "    ⚠️  CLOUDSDK_PYTHON must be set in you shell profile\\n"
     "${ASDF_INSTALL_PATH}/install.sh" --usage-reporting=false --path-update=false --quiet
     printf "✅  gcloud %s installed!\\n" "${ASDF_INSTALL_VERSION}"
 }