coala: Add show_bears to main script

The coala main script handles the --show_bears argument.

Fixes #477

coalib/coala.py

@@ -18,6 +18,7 @@
 from coalib.misc.StringConstants import StringConstants
 from coalib.processes.SectionExecutor import SectionExecutor
 from coalib.settings.SectionManager import SectionManager
+from coalib.output.show_bears import show_bears
 
 from coalib.misc.i18n import _
 
@@ -31,18 +32,27 @@ def main():
         yielded_results = False
         sections, local_bears, global_bears, targets, interactor, log_printer \
             = SectionManager().run()
-        for section_name in sections:
-            section = sections[section_name]
-            if not section.is_enabled(targets):
-                continue
+        if "show_bears" in sections["default"]:
+            if sections["default"]["show_bears"]:
+                show_bears(sections,
+                           local_bears,
+                           global_bears,
+                           targets,
+                           interactor)
+                did_nothing = False
+        else:
+            for section_name in sections:
+                section = sections[section_name]
+                if not section.is_enabled(targets):
+                    continue
 
-            yielded_results = yielded_results or SectionExecutor(
-                section=section,
-                global_bear_list=global_bears[section_name],
-                local_bear_list=local_bears[section_name],
-                interactor=interactor,
-                log_printer=log_printer).run()[0]
-            did_nothing = False
+                yielded_results = yielded_results or SectionExecutor(
+                    section=section,
+                    global_bear_list=global_bears[section_name],
+                    local_bear_list=local_bears[section_name],
+                    interactor=interactor,
+                    log_printer=log_printer).run()[0]
+                did_nothing = False
 
         if did_nothing:
             interactor.did_nothing()