init cli docs

pkgs/kubenix.nix

@@ -4,11 +4,11 @@
   coreutils,
   nix,
   jq,
+  kubectl,
 }: let
   name = "kubenix";
 in
-  lib.recursiveUpdate
-  (writeShellScriptBin name ''
+  lib.recursiveUpdate (writeShellScriptBin name ''
     set -Eeuo pipefail
 
     NAME=${name}
@@ -18,16 +18,23 @@ in
 
       commands:
         apply    - create resources in target cluster
+        diff     - show a diff between rendered and live resources
         render   - print resource manifests to stdout
       "
     }
 
+    MANIFEST="$(${nix}/bin/nix eval '.#k8s.config.kubernetes.result' --raw)"
+
     function apply() {
-      echo not impremented
+      ${kubectl}/bin/kubectl apply -f $MANIFEST
     }
 
     function render() {
-      ${nix}/bin/nix eval '.#kubernetes' # | ${jq}/bin/jq 'fromjson'
+      cat $MANIFEST | ${jq}/bin/jq
+    }
+
+    function diff() {
+      ${kubectl}/bin/kubectl diff -f $MANIFEST
     }
 
     while test $# -gt 0; do
@@ -36,6 +43,10 @@ in
           shift
           apply
           ;;
+        diff)
+          shift
+          diff
+          ;;
         render)
           shift
           render