Add aur and su fish functions

.config/fish/functions/aur.fish

@@ -0,0 +1,11 @@
+# Route aur build/sync through the ccache wrapper (~/.local/bin/aurb, aurs)
+function aur --wraps aur --description 'aur with ccache for build/sync'
+    switch "$argv[1]"
+        case build
+            aurb $argv[2..-1]
+        case sync
+            aurs $argv[2..-1]
+        case '*'
+            command aur $argv
+    end
+end

.config/fish/functions/su.fish

@@ -0,0 +1,3 @@
+function su
+    command su --shell=/usr/bin/fish $argv
+end