Hide messages away unless DEBUG is set to non-zero value.

packages/os.sh

@@ -3,10 +3,18 @@
 tag_file="$(mktemp)"
 trap 'rm "${tag_file}"' EXIT
 
+DEBUG="${DEBUG:-0}"
+
+log() {
+	if [ "${DEBUG}" -gt 0 ]; then
+		printf "$@"
+	fi
+}
+
 add_tag() {
 	for tag in "$@"; do
 		if ! has_tags "$tag"; then
-			echo "Adding detected tag: $tag"
+			log "Adding detected tag: $tag\n"
 			echo "${tag}" >> "${tag_file}"
 		fi
 	done
@@ -14,17 +22,17 @@ add_tag() {
 
 has_tags() {
 	for req in "$@"; do
-		printf "Checking for tag: $req... "
+		log "Checking for tag: $req... "
 		detected=0
 		while IFS= read -r line; do
 			if [ "$line" = "$req" ]; then
-				echo "yes"
+				log "yes\n"
 				detected=1
 				break
 			fi
 		done < "$tag_file"
 		if [ "$detected" -eq 0 ]; then
-			echo "no"
+			log "no\n"
 			return 1
 		fi
 	done
@@ -32,12 +40,12 @@ has_tags() {
 }
 
 has_binary() {
-	printf "Checking for binary: $1... "
+	log "Checking for binary: $1... "
 	if ! command -v "$1" >/dev/null 2>&1; then
-		echo "no"
+		log "no\n"
 		return 1
 	fi
-	echo "yes"
+	log "yes\n"
 	return 0
 }
 

packages/packages.sh

@@ -11,7 +11,21 @@ pacman_install() {
 }
 
 yay_install() {
-	yay -S --noconfirm --needed "$@"
+	packages=""
+	for package in "$@"; do
+		if ! pacman -Q "${package}" >/dev/null 2>&1; then
+			packages="${packages} ${package}"
+		fi
+	done
+	if [ ! -z "${packages}" ]; then
+		yay -S --noconfirm --needed ${packages}
+	fi
+	for package in "$@"; do
+		if ! pacman -Q "${package}" >/dev/null 2>&1; then
+			return 1 # at least one of the packages has not been correctly installed!
+		fi
+	done
+	return 0
 }
 
 pacaur_install() {