feat: do not display notification when make is not available

modules/home-manager/audio/cmus/files/notify.sh

@@ -1,15 +1,15 @@
 #!/usr/bin/env bash
 # shellcheck disable=SC2154
+NOTIFICATION_PROGRAM='mako
+'
 process_args() {
-    while [ "$#" -ge 2 ]
-    do
+    while [ "$#" -ge 2 ]; do
         printf -v "$1" "%s" "$2"
         shift
         shift
     done
 }
 
-#
 escape() {
     local string
     string=$1
@@ -19,10 +19,17 @@ escape(){
     printf "%s" "$string"
 }
 
+# Just quit this application if our notification program does not exist
+# With this notification will not be displayed on my work laptop. Avoid
+# notification pollution!
+check_notification_program() {
+    if ! command -v "$NOTIFICATION_PROGRAM"; then
+        exit 0
+    fi
+}
 
 main() {
     options=(--app-name=cmus --transient -u low)
-    
     filename=${file##*/}
     path=${file%/*}
 
@@ -41,22 +48,19 @@ main() {
     fi
     title="<b>$title</b>"
 
-    if [ -n "$artist" ]
-    then
+    if [ -n "$artist" ]; then
         if [[ ${#artist} -gt 22 ]]; then
             artist="${artist:0:21}…"
         fi
         printf -v l_artist "<span size='x-large'>by </span>%s" "$(escape "$artist")"
     fi
 
-    if [ -n "$date" ]
-    then
+    if [ -n "$date" ]; then
         date="${date%%-*}"
     fi
 
     # Get Album
-    if [ -n "$album" ]
-    then
+    if [ -n "$album" ]; then
         if [[ ${#album} -gt 19 ]]; then
             album="${album:0:19}…"
         fi
@@ -65,8 +69,9 @@ main() {
 
     printf -v l_intro "<span variant='small-caps'>cmus:<b>%s</b></span>" "$(escape "$status")"
     printf -v body "%s\n" "${l_intro:-}" "${title:-}" "${l_artist:-}" "${l_album:-}"
-    notify-send "${options[@]}"  "unseless" "$body"
+    notify-send "${options[@]}" "useless" "$body"
 }
 
+check_notification_program
 process_args "$@"
 main