From 592901ea2c7ae225e69606e0b28518515fe1e726 Mon Sep 17 00:00:00 2001
From: Ingolf Wagner <contact@ingolf-wagner.de>
Date: Tue, 5 Nov 2019 22:39:57 +0100
Subject: [PATCH] syncthing: add proper versioning

---
 configs/sterni/syncthing.nix |  2 +-
 modules/later/syncthing.nix  | 62 +++++++++++++++++++++++++++++-------
 2 files changed, 52 insertions(+), 12 deletions(-)

diff --git a/configs/sterni/syncthing.nix b/configs/sterni/syncthing.nix
index f2af999..125e3c0 100644
--- a/configs/sterni/syncthing.nix
+++ b/configs/sterni/syncthing.nix
@@ -21,7 +21,7 @@
         };
         finance = {
           enable = true;
-         path = "/home/palo/finance";
+          path = "/home/palo/finance";
         };
         lost-fotos = {
           enable = true;
diff --git a/modules/later/syncthing.nix b/modules/later/syncthing.nix
index 927f50c..2f9d365 100644
--- a/modules/later/syncthing.nix
+++ b/modules/later/syncthing.nix
@@ -18,7 +18,7 @@ let
     fsWatcherEnabled = folder.watch;
     fsWatcherDelayS = folder.watchDelay;
     ignorePerms = folder.ignorePerms;
-    versioning = optionalAttrs folder.versioning.enable { type = "simple"; params.keep = toString folder.versioning.keep; };
+    versioning = folder.versioning;
   }) (filterAttrs (
     _: folder:
     folder.enable
@@ -221,17 +221,57 @@ in {
                 '';
               };
 
-              versioning = {
-                enable = mkEnableOption ''
-                  simple versioning, see https://docs.syncthing.net/users/versioning.html#simple-file-versioning
+              versioning = mkOption {
+                default = null;
+                description = ''
+                  how to keep changed/deleted files with syncthing.
+                  there are 4 different types of versioning with different parameters
+                  see https://docs.syncthing.net/users/versioning.html#simple-file-versioning
                 '';
-                keep = mkOption {
-                  type = types.int;
-                  default = 5;
-                  description = ''
-                    The number of old versions to keep, per file.
-                  '';
-                };
+                example = [
+                  {
+                    versioning = {
+                      type = "simple";
+                      params.keep = "10";
+                    };
+                  }
+                  {
+                    versioning = {
+                      type = "trashcan";
+                      params.cleanoutDays = "1000";
+                    };
+                  }
+                  {
+                    versioning = {
+                      type = "staggered";
+                      params = {
+                        cleanInterval = "3600";
+                        maxAge = "31536000";
+                        versionsPath = "/syncthing/backup";
+                      };
+                    };
+                  }
+                  {
+                    versioning = {
+                      type = "external";
+                      params.versionsPath = pkgs.writers.writeBash "backup" ''
+                        folderpath="$1"
+                        filepath="$2"
+                        rm -rf "$folderpath/$filepath"
+                      '';
+                    };
+                  }
+                ];
+                type = with types; nullOr (submodule {
+                  options = {
+                    type = mkOption {
+                      type = enum [ "external" "simple" "staggered" "trashcan" ];
+                    };
+                    params = mkOption {
+                      type = attrsOf (either str path);
+                    };
+                  };
+                });
               };
 
               rescanInterval = mkOption {