[PATCH v4 2/3] apps: cam: Print control enum values more nicely

[Paul Elder]

Now that enum names can be obtained from ControlId, use that information
to print out the list of supported enum values in --list-controls.

Example output (with a dummy AwbMode ControlInfo added to vimc):

$ cam -c 1 --list-controls
Using camera platform/vimc.0 Sensor B as cam0
Control: AwbMode:
  - AwbTungsten (2)
  - AwbFluorescent (3)
  - AwbDaylight (5)
Control: Brightness: [-1.000000..1.000000]
Control: Contrast: [0.000000..2.000000]
Control: Saturation: [0.000000..2.000000]

Signed-off-by: Paul Elder <paul.elder at ideasonboard.com>
Reviewed-by: Umang Jain <umang.jain at ideasonboard.com>

---
Changes in v4:
- use the newly exposed enumerators() (instead of enumToString())
- add example output to commit message

Changes in v3:
- s/enumName/enumToString/

No change in v2
---
 src/apps/cam/camera_session.cpp | 19 +++++++++++++++++--
 1 file changed, 17 insertions(+), 2 deletions(-)

diff --git a/src/apps/cam/camera_session.cpp b/src/apps/cam/camera_session.cpp
index 097dc4792..fc0923801 100644
--- a/src/apps/cam/camera_session.cpp
+++ b/src/apps/cam/camera_session.cpp
@@ -159,8 +159,23 @@ CameraSession::~CameraSession()
 void CameraSession::listControls() const
 {
 	for (const auto &[id, info] : camera_->controls()) {
-		std::cout << "Control: " << id->name() << ": "
-			  << info.toString() << std::endl;
+		if (info.values().empty()) {
+			std::cout << "Control: " << id->name() << ": "
+				  << info.toString() << std::endl;
+		} else {
+			std::cout << "Control: " << id->name() << ":" << std::endl;
+			for (const auto &value : info.values()) {
+				int32_t val = value.get<int32_t>();
+				const auto &it = id->enumerators().find(val);
+
+				std::cout << "  - ";
+				if (it == id->enumerators().end())
+					std::cout << "UNKNOWN";
+				else
+					std::cout << it->second;
+				std::cout << " (" << val << ")" << std::endl;
+			}
+		}
 	}
 }
 
-- 
2.39.2