Added new exception and exported functions. Fixed pre-commit git hook.

.githooks/pre-commit

@@ -24,9 +24,5 @@
 make test && make pep && make doc
 if [ $? -ne 0 ]; then
     exit 1
-else
-    exit 0
 fi
 git add .
-
-

md_toc/__init__.py

@@ -26,7 +26,8 @@
     compute_toc_line_indentation_spaces, build_toc_line_without_indentation,
     build_toc, build_multiple_tocs, write_string_on_file_between_markers,
     write_strings_on_files_between_markers, is_valid_code_fence_indent,
-    is_opening_code_fence, is_closing_code_fence)
+    is_opening_code_fence, is_closing_code_fence, build_indentation_list,
+    toc_renders_as_list)
 from .cli import (CliInterface)
 from .exceptions import (GithubOverflowCharsLinkLabel, GithubEmptyLinkLabel,
                          GithubOverflowOrderedListMarker,

md_toc/exceptions.py

@@ -35,3 +35,7 @@ class GithubOverflowOrderedListMarker(Exception):
 
 class StdinIsNotAFileToBeWritten(Exception):
     """stdin cannot be written onto."""
+
+
+class TocDoesNotRenderAsCoherentList(Exception):
+    """TOC list indentations are either wrong or not what the user intended."""