imp: work around the possibility of different pre-commit versions

Author: David Arnold

modules/pre-commit.nix

@@ -59,7 +59,7 @@ let
                       The entry point - the executable to run. entry can also contain arguments that will not be overridden such as entry: autopep8 -i.
                     '';
                 };
-              language =
+             language =
                 mkOption {
                   type = types.str;
                   description =
@@ -331,12 +331,25 @@ in
                 ln -s ${configFile} .pre-commit-config.yaml
                 # Remove any previously installed hooks (since pre-commit itself has no convergent design)
                 hooks="pre-commit pre-merge-commit pre-push prepare-commit-msg commit-msg post-checkout post-commit"
+                uninstall_help=$(pre-commit uninstall --help)
+                install_help=$(pre-commit install --help)
                 for hook in $hooks; do
-                  pre-commit uninstall -t $hook
+                  # different version of pre-commit support different hooks
+                  if [[ "$uninstall_help" =~ "$hook" ]]; then
+                    pre-commit uninstall -t $hook
+                  fi
                 done
                 # Add hooks for configured stages (only) ...
                 if [ ! -z "${concatStringsSep " " cfg.default_stages}" ]; then
                   for stage in ${concatStringsSep " " cfg.default_stages}; do
+                    if [[ "$stage" == "manual" ]]; then
+                      continue
+                    fi
+                    # different version of pre-commit support different hooks
+                    if [[ ! "$install_help" =~ "$stage" ]];then
+                        echo 1>&2 "WARNING: nix-pre-commit-hooks: '$stage' is not supported by this pre-commit version."
+                        continue
+                    fi
                     case $stage in
                       commit | merge-commit | push)
                         stage="pre-"$stage