Add stats_rewrite setting

CHANGELOG.md

@@ -6,6 +6,7 @@
 
 - A GitHub action to check the build
 - Add support for "not in order" in extended and advanced search
+- The `stats_rewrite` setting for altering the statistics table
 
 ### Changed
 

app/scripts/model.js

@@ -15,6 +15,7 @@ model.normalizeStatsData = function (data) {
     }
 }
 
+/** The Proxy classes wrap API requests with pre-/postprocessing and progress reporting. */
 class BaseProxy {
     constructor() {
         this.prev = ""

app/scripts/statistics.js

@@ -106,7 +106,12 @@ const createStatisticsService = function () {
                 corpora: _.keys(data.corpora),
                 prevNonExpandedCQP,
             }
-            def.resolve([e.data, columns, searchParams])
+            let result = [e.data, columns, searchParams]
+            // Invoke configurable stats rewriting
+            if (settings.stats_rewrite) {
+                result = settings.stats_rewrite(result)
+            }
+            def.resolve(result)
         }
 
         statsWorker.postMessage({

doc/frontend_devel.md

@@ -523,8 +523,9 @@ parameters for attributes.
 - **sidebar_hide_label**: `boolean`. If `true`, do not show the localized attribute label and the colon following it in the
   sidebar, only the attribute value. This can be used, for example, if the `pattern` for the attribute includes the label but
   the label should be shown in the attribute lists of the extended search or statistics.
-- **stats_cqp**: See [Custom statistics functions](#custom-statistics-functions).  
-- **stats_stringify**: See [Custom statistics functions](#custom-statistics-functions).
+- **stats_cqp**: See [Rendering attribute values in the statistics view](#rendering-attribute-values-in-the-statistics-view).
+- **stats_rewrite**: A function that takes the array `[data, columns, searchParams]`, modifies and returns it.
+- **stats_stringify**: See [Rendering attribute values in the statistics view](#rendering-attribute-values-in-the-statistics-view).
 - **translation**: An object containing translations of possible values of the attribute, in this format:
     ```
     {
@@ -676,7 +677,7 @@ Data about the search, the current token and current attribute is stored in a nu
 
 *Note: The component not an actual Angular.js [component](https://docs.angularjs.org/guide/component). It will be added to the interface by manually creating a new scope and using `$controller` to instantiate the controller and `$compile` to instantiate the template.*
 
-#### Rendering attribute values in the statistics-view
+#### Rendering attribute values in the statistics view
 
 Define your own rules for rendering values and generating CQP-expressions for certain attributes.
 
@@ -703,6 +704,8 @@ export default {
 Rendering values and generating CQP can also be controlled by editing `app/config/statistics_config.js`, but 
 of course it is best to avoid editing the actual code if it is possible.
 
+If you need to merge rows or otherwise alter the table structure, implement and assign a function to the `stats_rewrite` setting.
+
 #### Stringify functions
 
 Add all custom pretty-printing to `custom/stringify.js`. Example file: