rc doc: Don't spawn processes unecessarily

rc/tools/doc.kak

@@ -136,14 +136,15 @@ define-command -params 1 -hidden doc-render %{
 
 define-command -params 0..2 \
     -shell-script-candidates %{
-        if [ "$kak_token_to_complete" -eq 0 ]; then
+        case "$kak_token_to_complete" in
+            0)
                 find -L \
                     "${kak_config}/autoload/" \
                     "${kak_runtime}/doc/" \
                     "${kak_runtime}/rc/" \
                     -type f -name "*.asciidoc" 2>/dev/null |
-                sed 's,.*/,,; s/\.[^.]*$//'
-        elif [ "$kak_token_to_complete" -eq 1 ]; then
+                    sed 's,.*/,,; s/\.[^.]*$//';;
+            1)
                 page=$(
                     find -L \
                         "${kak_config}/autoload/" \
@@ -157,8 +158,8 @@ define-command -params 0..2 \
                         /^==+ +/ { sub(/^==+ +/, ""); print }
                         /^\[\[[^\]]+\]\]/ { sub(/^\[\[/, ""); sub(/\]\].*/, ""); print }
                     ' < $page | tr '[A-Z ]' '[a-z-]'
-            fi
-        fi
+                fi;;
+        esac
     } \
     doc -docstring %{
         doc <topic> [<keyword>]: open a buffer containing documentation about a given topic