From da429430ad7aa971d914102030a2362daa55e510 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Maciej=20Bar=C4=87?= <xgqt@protonmail.com>
Date: Mon, 21 Dec 2020 23:51:51 +0100
Subject: [PATCH] src/eprefix-activate: better way to detect if the script is
 sourced
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Signed-off-by: Maciej Barć <xgqt@protonmail.com>
---
 src/eprefix-activate | 17 +++++++++++------
 1 file changed, 11 insertions(+), 6 deletions(-)

diff --git a/src/eprefix-activate b/src/eprefix-activate
index dd343e6..5f8e329 100644
--- a/src/eprefix-activate
+++ b/src/eprefix-activate
@@ -72,12 +72,17 @@ eprefix_world() {
 # >>> Checks
 
 # Exit if script is not sourced
-if [[ "${0}" != *sh ]]
-then
-    echo "Don't run this script"
-    echo "Source it instead"
-    exit 1
-fi
+case ${-} in
+    *i* )
+        :
+        ;;
+    * )
+        echo "${eprefix_bad} Error: not a login shell"
+        echo "${eprefix_bad} Run: source ${0}"
+        echo ">>> Exiting the shell"
+        exit 1
+        ;;
+esac
 
 # Exit if eprefix does not exist
 if [ ! -d "${EPREFIX}" ]