rework watch command

tix/default.nix

@@ -3,4 +3,5 @@
   it = import ./it.nix;
   test = import ./test.nix;
   watch = import ./watch.nix pkgs;
+  filters = import ./filters.nix;
 }

tix/run.nix

@@ -9,6 +9,7 @@ pkgs: files: let
 in (pkgs.writeShellScriptBin "test" ''
   t=$1
   case "$t" in
+    "file") echo '${resFile}' ;;
     "raw") cat '${resFile}' ;;
     "json") jq '.' '${resFile}' ;;
     "nix") ${extractNix} | ${pkgs.alejandra}/bin/alejandra -q ;;

tix/watch.nix

@@ -1,17 +1,21 @@
 pkgs: {
   cmd,
+  setup ? null,
   stop ? null,
+  process ? "echo \"$out\"",
   view ? null,
 }:
 pkgs.writeShellScriptBin "watch" ''
+  path=''${1:-.}
+  ${toString setup}
   while true
   do
-    ${cmd} ${
-    if view == null
-    then ""
-    else "| ${view} "
-  }&
-    ${pkgs.inotify-tools}/bin/inotifywait -e modify -r .
+    out=$(${cmd})
+    ${process}
+    ${if view == null then "" else ''
+      echo "$out" | ${view}
+    ''}
+    ${pkgs.inotify-tools}/bin/inotifywait -q -e modify -r $path
     ${toString stop}
   done
 ''