add: strick check options

README.md

@@ -19,20 +19,25 @@ preprocessors:
     - checksources
 ```
 
-You can add a list of unmentioned files that wouldn't throw warnings by `not_in_chapters` option.
-To perform a strict check, use the `strict_check` option:
+### Options
 
+- `not_in_chapters` –  a list of files not mentioned in the the chapters.
+  No warnings will be displayed for the specified files.
+  This option is useful if you don't need to add some files to the table of contents.
+- `strict_check` – if a critical error is detected, the build will be failed after applying the preprocessor.
+  Several checks are supported:
+    - `not_exist` – checking the existence of the file.
+      Checks if the file specified in chapters exists;
+    - `duplicate` – checking for duplicate in the chapters.
+
+  To disable strict check, use `strict_check: false`. And in order to enable all available checks, use `strict_check: true`.
+
+**Example of options:**
 ```yaml
 preprocessors:
     - checksources:
         not_in_chapters:
           - tags.md
-        strict_check: true
+        strict_check:
+          - not_exist
 ```
-
-The `not_in_chapters` option is useful if you don't need to add some files to the table of contents.
-
-If the `strict_check` option is enabled, then if a critical error is detected, the build will be aborted after applying the preprocessor.
-
-
-

foliant/preprocessors/checksources.py

@@ -12,7 +12,10 @@
 class Preprocessor(BasePreprocessorExt):
     defaults = {
         'not_in_chapters': [],
-        'strict_check': True,
+        'strict_check': [
+            'not_exist',
+            'duplicate'
+        ],
     }
 
     def __init__(self, *args, **kwargs):
@@ -23,6 +26,11 @@ def __init__(self, *args, **kwargs):
         self.logger.debug(f'Preprocessor inited: {self.__dict__}')
         self.src_dir = self.project_path / self.config['src_dir']
         self.critical_error = []
+        if isinstance(self.options['strict_check'], bool):
+            if self.options['strict_check']:
+                self.options['strict_check'] = self.defaults['strict_check']
+            else:
+                self.options['strict_check'] = []
         self.files_list = []
 
     def apply(self):
@@ -48,15 +56,15 @@ def _recursive_process_chapters(chapters_subset):
                     else:
                         self.logger.debug('Not exist, throw warning')
                         msg = f'{os.path.relpath(chapter_file_path)} does not exist'
-                        if self.options['strict_check']:
+                        if 'not_exist' in self.options['strict_check']:
                             self.logger.error(msg)
                             self.critical_error.append(msg)
                             output(f'ERROR: {msg}')
                         else:
                             self._warning(msg)
                     if chapters_subset in self.files_list:
                         msg = f'{os.path.relpath(chapter_file_path)} duplicated in chapters'
-                        if self.options['strict_check']:
+                        if 'duplicate' in self.options['strict_check']:
                             self.logger.error(msg)
                             self.critical_error.append(msg)
                             output(f'ERROR: {msg}')