Launch a new terminal when none is running

Launch a new terminal when none is running

The user no longer needs to manually launch a terminal emulator before
using this script.

It works with manual configuration as well as auto detected terminal 
emulators.

When the script is configured to auto detect terminal (option 2), it 
launches the leftmost valid terminal emulator.

any_term_dropdown.sh

@@ -29,6 +29,20 @@ my_term="xterm"
 # get terminal emulator and matching name pid ex: 44040485 
 pid=$(comm -12 <(xdotool search --name "$my_term" | sort) <(xdotool search --class "$my_term" | sort))
 
+# start a new terminal if none is currently running
+if [[ -z "$pid" ]]; then
+    while IFS='|' read -ra TERMS; do
+        for candidate_term in "${TERMS[@]}"; do
+            if command -v "$candidate_term" &>/dev/null; then
+                ${candidate_term} &>/dev/null &
+                disown
+                pid=$!
+                break
+            fi
+        done
+    done <<<"$my_term"
+fi
+
 # get windows id from pid ex: 0x2a00125%
 wid=$(printf 0x%x "$pid")