re-enable allfollow.

Now that allfollow is [deterministic](spikespaz/allfollow#1)
we no longer have to use jq to sort its output.

We now use `delta` instead of `difftasitc` to fail if flake.lock was not
already pruned.

I'm not sure now that we need an `allfollow check` command,
since it is better for users to see a nice diff as error message.

Related:
spikespaz/allfollow#7

Author: vic

modules/allfollow.nix

@@ -37,21 +37,17 @@ let
         name = "allfollow-run";
         runtimeInputs = [
           pkgs.nix
-          pkgs.difftastic
-          pkgs.jq
+          pkgs.delta
           inputs'.allfollow.packages.default
         ];
         text = ''
           if [ "apply" == "''${1:-}" ]; then
             nix flake lock
-            allfollow prune --pretty "''${2}" -o - | jq -S . > flake.lock.pruned
-            mv flake.lock.pruned "''${2}"
+            allfollow prune --in-place --pretty "''${2}"
           fi
           if [ "check" == "''${1:-}" ]; then
-            allfollow prune "''${2}" --pretty -o pruned.lock
-            allfollow count --json --pretty -o - pruned.lock | jq -S . > pruned.json
-            allfollow count --json --pretty -o - "''${2}" | jq -S . > current.json
-            difft --exit-code --display inline pruned.json current.json
+            allfollow prune --pretty "''${2}" -o pruned.lock
+            delta --paging never --side-by-side pruned.lock "''${2}"
           fi
         '';
       }

modules/write-flake.nix

@@ -121,7 +121,7 @@
         text = ''
           set -e
           cp ${formatted} flake.nix
-          # ${lib.getExe allfollow-run} apply
+          ${lib.getExe allfollow-run} apply
         '';
       };
 
@@ -133,7 +133,7 @@
           ''
             set -e
             delta --paging never --side-by-side ${formatted} ${inputs.self}/flake.nix
-            # ${lib.getExe allfollow-run} check ${inputs.self}/flake.lock
+            ${lib.getExe allfollow-run} check ${inputs.self}/flake.lock
             touch $out
           '';
     in