home: modify killall for wrapped apps, clean bashrcExtra

hosts/home.nix

@@ -102,13 +102,21 @@ in
       rm = "trash-put";
       emacs = "emacsclient -nw";
     };
-    # Change to directory when exiting ranger with Q
-    # https://github.com/ranger/ranger/issues/1554#issuecomment-491650123
     bashrcExtra = ''
+      # Modify killall for wrapped applications, e.g. firefox
+      # killall firefox -> killall firefox || killall .firefox-wrapped
+      function killall {
+        `which killall` $1 || `which killall` .''${1}-wrapped
+      }
+
+      # pandoc macro
+      # pandoc document.md -> pandoc document.md -o document.pdf ...
       function pdf {
-        pandoc "$1" -o "''${1%.*}.pdf" -V colorlinks=true -V linkcolor=blue
+        pandoc $1 -o ''${1%.*}.pdf -V colorlinks=true -V linkcolor=blue
       }
 
+      # Change to directory when exiting ranger with Q
+      # https://github.com/ranger/ranger/issues/1554#issuecomment-491650123
       function ranger {
         local IFS=$'\t\n'
         local tempfile="$(mktemp -t tmp.XXXXXX)"