scripts: updated to cleaner logic for global variables

.local/bin/etc/sxhkd/audio/lmc

@@ -4,7 +4,7 @@
 # Based on a script by lukesmithxyz, checkout github.com/lukesmithxyz/voidrice
 # Heavily extended and updated to a pipewire system
 
-[ -z "$LOOPBACK_DEVICE" ] && device="Easy Effects Source" || device="$LOOPBACK_DEVICE"
+device=${LOOPBACK_DEVICE:-Easy Effects Source}
 
 name=$(wpctl status | sed -n '/Sources/,$p' | sed -n '/Filter/q;p' | grep "$device" | sed -e "s/*/\ /g")
 id=$( echo $name | cut -d '.' -f 1 | cut -c 5-)

.local/bin/etc/sxhkd/monitor

@@ -3,8 +3,8 @@
 # toggle external monitor
 # by lukesmithxyz, checkout github.com/lukesmithxyz/voidrice
 
-[ -z "$INTERNAL_MONITOR" ] && intern="LVDS1" || intern="$INTERNAL_MONITOR"
-[ -z "$EXTERNAL_MONITOR" ] && extern="HDMI2" || extern="$EXTERNAL_MONITOR"
+intern=${INTERNAL_MONITOR:-LVDS1}
+extern=${EXTERNAL_MONITOR:-HDMI2}
 
 case "$1" in
   toggle) (xrandr | grep "$extern disconnected")

.local/bin/etc/sxhkd/screenshot

@@ -3,9 +3,9 @@
 # Requires maim. It lets you choose the kind of screenshot to take,
 # including copying the image or even highlighting an area to copy.
 
-[ -z "$SCREENSHOT_DIR" ] && output_dir="$HOME/downloads" || output_dir="$SCREENSHOT_DIR"
+output=${SCREENSHOT_DIR:-$HOME/downloads}
 
-output="$output_dir/screenshot-$(date '+%Y-%m-%d_%H-%M-%S').png"
+output="$output/screenshot-$(date '+%Y-%m-%d_%H-%M-%S').png"
 xclip_img="xclip -sel clip -t image/png"
 xclip_txt="xclip -sel clip -t text/plain"