feat(managers/custom): generic manager for json files

docs/usage/configuration-options.md

@@ -706,22 +706,25 @@ You can define custom managers to handle:
 - Proprietary file formats or conventions
 - Popular file formats not yet supported as a manager by Renovate
 
-Currently we only have one custom manager.
-The `regex` manager which is based on using Regular Expression named capture groups.
+Renovate has two custom managers:
 
-You must have a named capture group matching (e.g. `(?<depName>.*)`) _or_ configure its corresponding template (e.g. `depNameTemplate`) for these fields:
+| Custom manager | Matching engine                                |
+| -------------- | ---------------------------------------------- |
+| `regex`        | Regular Expression, with named capture groups. |
+| `jsonata`      | JSONata query.                                 |
+
+You must capture/extract the following three fields _or_ configure its corresponding template (e.g. `depNameTemplate`) for these fields:
 
 - `datasource`
 - `depName` and / or `packageName`
 - `currentValue`
 
-Use named capture group matching _or_ set a corresponding template.
 We recommend you use only _one_ of these methods, or you'll get confused.
 
-We recommend that you also tell Renovate what `versioning` to use.
+We also recommend that you also tell Renovate what `versioning` to use.
 If the `versioning` field is missing, then Renovate defaults to using `semver` versioning.
 
-For more details and examples about it, see our [documentation for the `regex` manager](modules/manager/regex/index.md).
+For more details and examples regarding custom managers, see our documentation for the [`regex` manager](modules/manager/regex/index.md) and the [`JSONata` manager](modules/manager/jsonata/index.md).
 For template fields, use the triple brace `{{{ }}}` notation to avoid Handlebars escaping any special characters.
 
 <!-- prettier-ignore -->
@@ -763,6 +766,10 @@ This will lead to following update where `1.21-alpine` is the newest version of
 image: my.new.registry/aRepository/andImage:1.21-alpine
 ```
 
+<!-- prettier-ignore -->
+!!! note
+    Can only be used with the custom regex manager.
+
 ### currentValueTemplate
 
 If the `currentValue` for a dependency is not captured with a named group then it can be defined in config using this field.
@@ -786,9 +793,24 @@ Example:
 }
 ```
 
+```json title="Parsing a JSON file with a custom manager"
+{
+  "customManagers": [
+    {
+      "customType": "jsonata",
+      "fileFormat": "json",
+      "fileMatch": ["file.json"],
+      "matchStrings": [
+        "packages.{ \"depName\": package, \"currentValue\": version }"
+      ]
+    }
+  ]
+}
+```
+
 ### datasourceTemplate
 
-If the `datasource` for a dependency is not captured with a named group then it can be defined in config using this field.
+If the `datasource` for a dependency is not captured with a named group, then it can be defined in config using this field.
 It will be compiled using Handlebars and the regex `groups` result.
 
 ### depNameTemplate
@@ -803,23 +825,58 @@ It will be compiled using Handlebars and the regex `groups` result.
 
 ### extractVersionTemplate
 
-If `extractVersion` cannot be captured with a named capture group in `matchString` then it can be defined manually using this field.
+If `extractVersion` cannot be captured with a named capture group in `matchString`, then it can be defined manually using this field.
 It will be compiled using Handlebars and the regex `groups` result.
 
+### fileFormat
+
+`fileFormat` specifies the syntax of the package file that's managed by the custom JSONata manager.
+This setting helps the system correctly parse and interpret the configuration file's contents.
+
+Only the `json` format is supported.
+
+```json title="Parsing a JSON file with a custom manager"
+{
+  "customManagers": [
+    {
+      "customType": "jsonata",
+      "fileFormat": "json",
+      "fileMatch": [".renovaterc"],
+      "matchStrings": [
+        "packages.{ \"depName\": package, \"currentValue\": version }"
+      ]
+    }
+  ]
+}
+```
+
 ### matchStrings
 
-Each `matchStrings` must be a valid regular expression, optionally with named capture groups.
+Each `matchStrings` must be one of the following:
+
+1. A valid regular expression, which may optionally include named capture groups (if using `customType=regex`)
+2. Or, a valid, escaped [JSONata](https://docs.jsonata.org/overview.html) query (if using `customType=json`)
+
+Read the [`customType`](#customtype) docs, to learn more.
 
 Example:
 
-```json
+```json title="matchStrings with a valid regular expression"
 {
   "matchStrings": [
     "ENV .*?_VERSION=(?<currentValue>.*) # (?<datasource>.*?)/(?<depName>.*?)\\s"
   ]
 }
 ```
 
+```json title="matchStrings with a valid JSONata query"
+{
+  "matchStrings": [
+    "packages.{ \"depName\": package, \"currentValue\": version }"
+  ]
+}
+```
+
 ### matchStringsStrategy
 
 `matchStringsStrategy` controls behavior when multiple `matchStrings` values are provided.
@@ -829,6 +886,10 @@ Three options are available:
 - `recursive`
 - `combination`
 
+<!--prettier-ignore-->
+!!! note
+    `matchStringsStrategy` can only be used in a custom regex manager config!
+
 #### any
 
 Each provided `matchString` will be matched individually to the content of the `packageFile`.

lib/config/options/index.ts

@@ -2734,18 +2734,26 @@ const options: RenovateOptions[] = [
     description:
       'Custom manager to use. Valid only within a `customManagers` object.',
     type: 'string',
-    allowedValues: ['regex'],
+    allowedValues: ['jsonata', 'regex'],
     parents: ['customManagers'],
     cli: false,
     env: false,
   },
   {
-    name: 'matchStrings',
+    name: 'fileFormat',
     description:
-      'Regex capture rule to use. Valid only within a `customManagers` object.',
+      'It specifies the syntax of the package file being managed by the custom JSONata manager.',
+    type: 'string',
+    allowedValues: ['json'],
+    parents: ['customManagers'],
+    cli: false,
+    env: false,
+  },
+  {
+    name: 'matchStrings',
+    description: 'Queries to use. Valid only within a `customManagers` object.',
     type: 'array',
     subType: 'string',
-    format: 'regex',
     parents: ['customManagers'],
     cli: false,
     env: false,

lib/config/validation-helpers/utils.ts

@@ -1,9 +1,8 @@
 import is from '@sindresorhus/is';
+import jsonata from 'jsonata';
 import { logger } from '../../logger';
-import type {
-  RegexManagerConfig,
-  RegexManagerTemplates,
-} from '../../modules/manager/custom/regex/types';
+import type { RegexManagerTemplates } from '../../modules/manager/custom/regex/types';
+import type { CustomManager } from '../../modules/manager/custom/types';
 import { regEx } from '../../util/regex';
 import type { ValidationMessage } from '../types';
 
@@ -78,21 +77,20 @@ export function isFalseGlobal(
   return false;
 }
 
-function hasField(
-  customManager: Partial<RegexManagerConfig>,
-  field: string,
-): boolean {
+function hasField(customManager: CustomManager, field: string): boolean {
   const templateField = `${field}Template` as keyof RegexManagerTemplates;
+  const fieldStr =
+    customManager.customType === 'regex' ? `(?<${field}>` : field;
   return !!(
     customManager[templateField] ??
     customManager.matchStrings?.some((matchString) =>
-      matchString.includes(`(?<${field}>`),
+      matchString.includes(fieldStr),
     )
   );
 }
 
 export function validateRegexManagerFields(
-  customManager: Partial<RegexManagerConfig>,
+  customManager: CustomManager,
   currentPath: string,
   errors: ValidationMessage[],
 ): void {
@@ -114,7 +112,8 @@ export function validateRegexManagerFields(
   } else {
     errors.push({
       topic: 'Configuration Error',
-      message: `Each Custom Manager must contain a non-empty matchStrings array`,
+      message:
+        'Each Custom Manager `matchStrings` array must have at least one item.',
     });
   }
 
@@ -136,3 +135,56 @@ export function validateRegexManagerFields(
     });
   }
 }
+
+export function validateJSONataManagerFields(
+  customManager: CustomManager,
+  currentPath: string,
+  errors: ValidationMessage[],
+): void {
+  if (!is.nonEmptyString(customManager.fileFormat)) {
+    errors.push({
+      topic: 'Configuration Error',
+      message: 'Each JSONata manager must contain a fileFormat field.',
+    });
+  }
+
+  if (is.nonEmptyArray(customManager.matchStrings)) {
+    for (const matchString of customManager.matchStrings) {
+      try {
+        jsonata(matchString);
+      } catch (err) {
+        logger.debug(
+          { err },
+          'customManager.matchStrings JSONata query validation error',
+        );
+        errors.push({
+          topic: 'Configuration Error',
+          message: `Invalid JSONata query for ${currentPath}: \`${matchString}\``,
+        });
+      }
+    }
+  } else {
+    errors.push({
+      topic: 'Configuration Error',
+      message: `Each Custom Manager must contain a non-empty matchStrings array`,
+    });
+  }
+
+  const mandatoryFields = ['currentValue', 'datasource'];
+  for (const field of mandatoryFields) {
+    if (!hasField(customManager, field)) {
+      errors.push({
+        topic: 'Configuration Error',
+        message: `JSONata Managers must contain ${field}Template configuration or ${field} in the query `,
+      });
+    }
+  }
+
+  const nameFields = ['depName', 'packageName'];
+  if (!nameFields.some((field) => hasField(customManager, field))) {
+    errors.push({
+      topic: 'Configuration Error',
+      message: `JSONata Managers must contain depName or packageName in the query or their templates`,
+    });
+  }
+}