contrib: Unify style

Unify indentation and variables and add link to non-standard programs
called.

 contrib/config.sh | 33 +++++++++++++++++++++------------
 1 file changed, 21 insertions(+), 12 deletions(-)

diff --git a/contrib/config.sh b/contrib/config.sh
index 193b710..5169409 100755
--- a/contrib/config.sh
+++ b/contrib/config.sh
@@ -66,7 +66,8 @@ riverctl map-pointer normal $mod BTN_LEFT move-view
 # Mod + Right Mouse Button to resize views
 riverctl map-pointer normal $mod BTN_RIGHT resize-view
 
-for i in $(seq 1 9); do
+for i in $(seq 1 9)
+do
     tagmask=$((1 << ($i - 1)))
 
     # Mod+[1-9] to focus tag [0-8]
@@ -113,19 +114,27 @@ riverctl map normal $mod F11 enter-mode passthrough
 # Mod+F11 to return to normal mode
 riverctl map passthrough $mod F11 enter-mode normal
 
-# Various media key mapping for both normal and locked mode
+# Various media key mapping examples for both normal and locked mode which do
+# not have a modifier
 for mode in normal locked
 do
-	riverctl map "${mode}" None XF86Eject             spawn eject -T
-	riverctl map "${mode}" None XF86AudioRaiseVolume  spawn pamixer -i 5
-	riverctl map "${mode}" None XF86AudioLowerVolume  spawn pamixer -d 5
-	riverctl map "${mode}" None XF86AudioMute         spawn pamixer --toggle-mute
-	riverctl map "${mode}" None XF86AudioMedia        spawn playerctl play-pause
-	riverctl map "${mode}" None XF86AudioPlay         spawn playerctl play-pause
-	riverctl map "${mode}" None XF86AudioPrev         spawn playerctl previous
-	riverctl map "${mode}" None XF86AudioNext         spawn playerctl next
-	riverctl map "${mode}" None XF86MonBrightnessUp   spawn light -A 5
-	riverctl map "${mode}" None XF86MonBrightnessDown spawn light -U 5
+    # Eject the optical drive
+    riverctl map $mode None XF86Eject spawn eject -T
+
+    # Control pulse audio volume with pamixer (https://github.com/cdemoulins/pamixer)
+    riverctl map $mode None XF86AudioRaiseVolume  spawn pamixer -i 5
+    riverctl map $mode None XF86AudioLowerVolume  spawn pamixer -d 5
+    riverctl map $mode None XF86AudioMute         spawn pamixer --toggle-mute
+
+    # Control MPRIS aware media players with playerctl (https://github.com/altdesktop/playerctl)
+    riverctl map $mode None XF86AudioMedia spawn playerctl play-pause
+    riverctl map $mode None XF86AudioPlay  spawn playerctl play-pause
+    riverctl map $mode None XF86AudioPrev  spawn playerctl previous
+    riverctl map $mode None XF86AudioNext  spawn playerctl next
+
+    # Control screen backlight brighness with light (https://github.com/haikarainen/light)
+    riverctl map $mode None XF86MonBrightnessUp   spawn light -A 5
+    riverctl map $mode None XF86MonBrightnessDown spawn light -U 5
 done
 
 # Set repeat rate