Update tags doc

docs_new/Tags.md

@@ -1,9 +1,99 @@
 # Tags
 
+Tags can be set to repositories and are used for searching, filtering, and ordering purposes.
+
 ## Define tags
 
-todo.
+Tags can be defined in the `TagsV2.yaml` file located in `%APPDATA%\RepoM\` folder.
+The yaml consists of two parts. First an optional context section, and second the tags section.
+
+The context is the same context you use defining the action menu's. It allows you to add or define methods and variables. More information over the context can be found [here](Context.md)
+
+The 'tags' section of the yaml is an array of tag specifications. The property `tag` is a string and represents the name of the tag. The optional property `when` is a predicate condition when to apply the tag. The predicate is evaluated using Scriban.
+
+### Example
+
+The following `TagsV2.yaml` file defines three different tags (work, private, github) which are applied to a given repository when the `when` predicate matches the repository.
+
+```yaml
+context:
+- type: evaluate-script@1
+  content: |-
+    # at this moment, you must leave this function intact
+    # todo, make sure this is not required anymore.
+    func translate(input)
+      ret input
+    end
+
+    func remotes_contain_inner(remotes, url_part)
+      urls = remotes | array.map "url"
+      filtered = array.filter(urls, do 
+        ret string.contains($0, url_part) 
+      end)
+      ret array.size(filtered) > 0;
+    end
+
+    func remotes_contain(url_part)
+      ret remotes_contain_inner(repository.remotes, url_part)
+    end
+
+    func get_remote_origin()
+      remotes = repository.remotes;
+      filtered = array.filter(remotes, do 
+        remote = $0;
+        ret remote.key == "origin"
+      end)
+      ret array.first(filtered);
+    end
+
+    func repository_path_contains(path)
+      ret repository.linux_path | string.contains path
+    end
+
+    is_work_repository = remotes_contain("My-Work");
+    
+tags:
+
+# Add tag work when it is a 'work repository'. The 'is_work_repository' variable is defined in the context section.
+- tag: work
+  when: is_work_repository
+
+# Add tag 'private' when it is not a work repository, and the path contains 'Projects/Private'.
+# The custom method 'repository_path_contains' is defined in the context section.
+- tag: private
+  when: '!is_work_repository && repository_path_contains("Projects/Private")'
+
+# add tag 'github' when the remote contains 'github.com'.
+# remote_contains is a method defined in the context section.
+- tag: github
+  when: 'remotes_contain("github.com")'
+
+```
 
 ## Use tags
 
-todo.
+First, after applying tags, you noticat that they become visible in the UI. Although this is nice, it doesn't do anything for you at the moment.
+
+The power of defining tags is currently the possiblility to search by a tag. For this to work, you need to have selected the 'Lucene query parser'. 
+
+### Search
+
+Search for repositories with a given tag can be done using the the search key `tag` like this:
+
+- `tag:private` will match and show only repostitories containting this tag,
+- `!tag:github` will match and show only repositories that do NOT have the `github` tag,
+- `tag:work AND tag:github` will show only the repositories that both have the tag `work` as well as `github`.
+
+For now, all regular text is also matched against tags.
+
+- `private` will also match repositories with the tag `private` but will also match a repository called `My private stuff`.
+
+### Filter
+
+TODO
+See filtering.
+
+### Ordering
+
+TODO
+See Ordering.