[PATCH v4 4/4] apps: cam: Print control direction information

[Paul Elder]

Now that there is support for retrieving the allowed directions of a
control, print this information when listing controls.

Sample output:
$ cam --list-controls -c 2
Using camera Virtual0 as cam0
Control: [inout] draft::FaceDetectMode:
  - FaceDetectModeOff (0)
Control: [inout] libcamera::FrameDurationLimits: [16666..33333]
   Size: 2

Signed-off-by: Paul Elder <paul.elder at ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham at ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart at ideasonboard.com>

---
No change in v4

No change in v3

Changes in v2:
- s/i/in/, s/o/out/ so that the output is easier to read
---
 src/apps/cam/camera_session.cpp | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/src/apps/cam/camera_session.cpp b/src/apps/cam/camera_session.cpp
index 6e9890ccfda1..9e93482775c3 100644
--- a/src/apps/cam/camera_session.cpp
+++ b/src/apps/cam/camera_session.cpp
@@ -159,12 +159,18 @@ CameraSession::~CameraSession()
 void CameraSession::listControls() const
 {
 	for (const auto &[id, info] : camera_->controls()) {
+		std::stringstream io;
+		io << "["
+		   << (id->isInput() ? "in" : "  ")
+		   << (id->isOutput() ? "out" : "   ")
+		   << "] ";
+
 		if (info.values().empty()) {
-			std::cout << "Control: "
+			std::cout << "Control: " << io.str()
 				  << id->vendor() << "::" << id->name() << ": "
 				  << info.toString() << std::endl;
 		} else {
-			std::cout << "Control: "
+			std::cout << "Control: " << io.str()
 				  << id->vendor() << "::" << id->name() << ":"
 				  << std::endl;
 			for (const auto &value : info.values()) {
-- 
2.39.2