From 677660c1c62345432611b2e4a2e56439be6826d4 Mon Sep 17 00:00:00 2001
From: Felitendo <felitendoyt@gmail.com>
Date: Thu, 24 Sep 2026 10:23:59 +0200
Subject: [PATCH] fix: start faster by skipping lines scripts do not need

---
 src/lib/detect.sh | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/lib/detect.sh b/src/lib/detect.sh
index a9bad98..a509aad 100644
--- a/src/lib/detect.sh
+++ b/src/lib/detect.sh
@@ -486,6 +486,11 @@ _mca_script_target() {
 
 	MCA_SCRIPT_VARS=()
 
+	# Only assignments and exec lines matter, and the shell is slow at reading
+	# a big script line by line. So grep picks them out, and a script with no
+	# exec at all (winetricks has 20000 lines of that) is not read here at all.
+	grep -qaE '^[[:space:]]*exec[[:space:]]' -- "$script" 2>/dev/null || return 1
+
 	while IFS= read -r line; do
 		if [[ $line =~ $re_assign ]]; then
 			name="${BASH_REMATCH[2]}"
@@ -543,7 +548,8 @@ _mca_script_target() {
 			fi
 			return $?
 		done
-	done < "$script"
+	done < <(grep -aE '^[[:space:]]*((export[[:space:]]+)?[A-Za-z_][A-Za-z0-9_]*=|exec[[:space:]])' \
+		-- "$script" 2>/dev/null)
 	return 1
 }