feat(steps-lib): add directory_exists helper fn

Author: jsjoeio

ci/steps/steps-lib.sh

@@ -15,3 +15,13 @@ is_env_var_set() {
     echo 1
   fi
 }
+
+# Checks whether a directory exists.
+directory_exists() {
+  local dir="${1:-}"
+  if [[ -d "${dir:-}" ]]; then
+    echo 0
+  else
+    echo 1
+  fi
+}

test/scripts/steps-lib.bats

@@ -14,3 +14,13 @@ source "$SCRIPT"
   ASDF_TEST_SET="test" run is_env_var_set "ASDF_TEST_SET"
   [ "$output" = 0 ]
 }
+
+@test "directory_exists should 1 if directory doesn't exist" {
+  run directory_exists "/tmp/asdfasdfasdf"
+  [ "$output" = 1 ]
+}
+
+@test "directory_exists should 0 if directory exists" {
+  run directory_exists "$(pwd)"
+  [ "$output" = 0 ]
+}