Add support for the 'straight' maneuver direction (#4995)

Add support for the 'straight' maneuver direction

CHANGELOG.md

@@ -12,6 +12,7 @@
       - CHANGED #4929: Don't use obviousness for links bifurcations [#4929](https://github.com/Project-OSRM/osrm-backend/pull/4929)
       - FIXED #4929: Adjust Straight direction modifiers of side roads in driveway handler [#4929](https://github.com/Project-OSRM/osrm-backend/pull/4929)
       - CHANGED #4925: Added post process logic to collapse segregated turn instructions [#4925](https://github.com/Project-OSRM/osrm-backend/pull/4925)
+      - ADDED: Maneuver relation now supports `straight` as a direction [#4995](https://github.com/Project-OSRM/osrm-backend/pull/4995)
     - Tools:
       - `osrm-routed` accepts a new property `--memory_file` to store memory in a file on disk.
     - NodeJS:

features/guidance/maneuver-tag.feature

@@ -27,6 +27,7 @@ Feature: Maneuver tag support
             | maneuver | abc      | c        | cgi    | turn     | sharp_right |
             | maneuver | hij      | i        | cde    | turn     | sharp_left  |
             | maneuver | abc      | c        | cde    | turn     | slight_left |
+            | maneuver | cde      | c        | cgi    | turn     | straight    |
 
         When I route I should get
             | waypoints | route                               | turns                                    |
@@ -35,6 +36,7 @@ Feature: Maneuver tag support
             | b,g       | A Street,C Street,C Street          | depart,turn sharp right,arrive           |
         # Testing re-awakening suppressed turns
             | a,e       | A Street,B Street,B Street          | depart,turn slight left,arrive           |
+            | e,i       | B Street,C Street,C Street          | depart,turn straight,arrive              |
 
     Scenario: single via-way
       Given the node map

src/extractor/extraction_containers.cpp

@@ -844,6 +844,10 @@ void ExtractionContainers::PrepareManeuverOverrides()
         {
             result.second = guidance::DirectionModifier::Right;
         }
+        else if (direction_string == "straight")
+        {
+            result.second = guidance::DirectionModifier::Straight;
+        }
 
         return result;
     };