river: Add init reload without program restarts

By passing the 'no-restart' argument as the first parameter of the river init
file, we can prevent program restarting which we do not want to have restarted
every time (e.g. kanshi, wlsunset, waybar, swayidle, etc)

By default these programs will still always be restarted. However, passing the
parameter means that if the program is already running, we do not restart it.
If the program is not yet running it will still be started like normally.

The functionality makes use of the `pidof` program, so on Arch it requires the
'procps-ng' package. This is by default installed as a requirement for the
'base' package group.


Reverted changes from earlier wallpaper switch.

desktop/.config/river/init

@@ -8,6 +8,23 @@ time_to_lockscreen=300
 time_to_screendim=600
 time_to_suspend=900
 
+NO_RESTART="$1"
+should_start() { # 1=program binary name
+    # not running, start
+    if ! pidof "$1"; then
+        return 0
+    fi
+
+    # only reload, no restarting
+    if [ "$NO_RESTART" = "no-restart" ]; then
+        return 1
+    else
+        # kill then it can restart
+        killall "$1"
+        return 0
+    fi
+}
+
 ## OPTIONS
 riverctl spawn "dbus-update-activation-environment SEATD_SOCK DISPLAY WAYLAND_DISPLAY XDG_CURRENT_DESKTOP=river"
 riverctl focus-follows-cursor normal
@@ -31,7 +48,8 @@ riverctl rule-add -app-id "org.pwmt.zathura" csd
 
 ## DEBUG
 # Reload river configuration
-riverctl map normal $mod+Shift F12 spawn "$HOME/.config/river/init"
+riverctl map normal $mod+Shift F12 spawn "$HOME/.config/river/init no-restart"
+riverctl map normal $mod+Shift+Control F12 spawn "$HOME/.config/river/init"
 
 ## HOTKEYS
 # close focused view
@@ -125,7 +143,7 @@ riverctl map normal $mod+Control L snap right
 # Mod+F to toggle fullscreen
 riverctl map normal $mod F toggle-fullscreen
 # if we are running filtile we also have access to monocle mode
-if  [ "$layout" = "filtile" ]; then
+if [ "$layout" = "filtile" ]; then
     riverctl map normal $mod+Shift F spawn "riverctl send-layout-cmd $layout monocle"
 fi
 
@@ -267,7 +285,7 @@ done
 setxkbmap -option "compose:menu"
 
 # start dynamic display configuration
-[ "$(pidof kanshi)" -eq 0 ] || riverctl spawn kanshi
+should_start kanshi && riverctl spawn kanshi
 
 # set a nice wallpaper
 if exist swaybg; then
@@ -288,37 +306,36 @@ elif exist swww; then
 fi
 
 # start status bar
-killall waybar
-riverctl spawn waybar
+should_start waybar && riverctl spawn waybar
 
 # start redshift-like sundown warming using current location or standard values
-killall wlsunset
-loc=$(curl ipinfo.io | grep -e '"loc": ' | sed -e 's/^.*"loc": "\(.*\)",$/\1/')
-if [ -n "$loc" ]; then
-    riverctl spawn "wlsunset -l \"$(echo "$loc" | cut -d, -f1)\" -L \"$(echo "$loc" | cut -d, -f2)\""
-else
-    riverctl spawn "wlsunset -S \"09:00\" -s \"21:00\" -d \"3600\""
+if should_start wlsunset; then
+    loc=$(curl ipinfo.io | grep -e '"loc": ' | sed -e 's/^.*"loc": "\(.*\)",$/\1/')
+    if [ -n "$loc" ]; then
+        riverctl spawn "wlsunset -l \"$(echo "$loc" | cut -d, -f1)\" -L \"$(echo "$loc" | cut -d, -f2)\""
+    else
+        riverctl spawn "wlsunset -S \"09:00\" -s \"21:00\" -d \"3600\""
+    fi
+    unset loc
 fi
-unset loc
 
 # start screen idle locking/dimming/sleep tool
-killall swayidle
-riverctl spawn "swayidle \
+should_start swayidle && riverctl spawn "swayidle \
     timeout ${time_to_suspend} \"[ $(cat /sys/class/power_supply/AC/online) -eq 0 ] && systemctl suspend-then-hibernate\"
     timeout ${time_to_screendim} \"wlopm --off '*'\" \
     resume \"wlopm --on '*'\" \
     timeout ${time_to_lockscreen} \"pidof waylock || lockscreen\" \
     after-resume \"wlopm --on '*'\" \
     before-sleep \"pidof waylock || lockscreen\" &"
-killall clipman
-riverctl spawn "wl-paste -t text --watch clipman store"
+
+should_start wl-paste && riverctl spawn "wl-paste -t text --watch clipman store"
+
 # bash ~/.config/bin/gtktheme # setting our gtk variables
 # killall polkit-gnome-authentication-agent-1
 # /usr/lib/polkit-gnome/polkit-gnome-authentication-agent-1 &
 # start layouting engine
 killall $layout
-riverctl spawn "$layout\
-    --tags all --output all main-ratio 0.65,\
+riverctl spawn "$layout    --tags all --output all main-ratio 0.65,\
     --tags all --output all view-padding 6,\
     --tags all --output all outer-padding 0,\
     --tags all --output all smart-padding on,\