Fix pluralization in ros2 trace output

[devashravan]

This PR fixes a small issue in the output of the ros2 trace command. Earlier, even when only one event was enabled, the terminal would display:

userspace tracing enabled (1 events)

This has now been updated to correctly handle singular and plural forms:

userspace tracing enabled (1 event)

I’ve tested this locally using a source build of ROS 2 Rolling. Attached below is the terminal output for reference.

Let me know if any changes are needed!

[christophebedard]

Thanks for the PR! I just have one minor comment.

[christophebedard]

Also, the GitHub CI jobs are failing, but that's unrelated to your changes (see #160 and #170). What really matters is the CI jobs that I will manually trigger once the PR is ready.

[devashravan]

Hi @christophebedard , I've corrected the mistake you pointed out. Can you please review these changes?

[christophebedard]

Looks good, thanks for the PR and for making the change!

[christophebedard]

Pulls: #169
Gist: https://gist.githubusercontent.com/christophebedard/9c220883dc2c8ad873bb99ecc9dbd7eb/raw/7e7e2fd0d824e737adaa2b3e94d5aee98eb86ca7/ros2.repos
BUILD args: --packages-above-and-dependencies tracetools_trace
TEST args: --packages-above tracetools_trace
ROS Distro: rolling
Job: ci_launcher
ci_launcher ran: https://ci.ros2.org/job/ci_launcher/15794

• Linux
• Linux-aarch64
• Linux-rhel
• Windows

[devashravan]

Hi @christophebedard , it looks like the Windows build is failing, but I don’t think it’s related to the changes I made in this PR. Could you please confirm when you get a chance?

[christophebedard]

Yeah, that's related to https://github.com/ros2-rust/rosidl_rust. I retriggered the Windows job. Let's see if their new fix works (ros2-rust/rosidl_rust#3), otherwise I'll have to trigger a fresh set of CI jobs so that this repo is not included (ros2/ros2#1677).

[devashravan]

Got it! I'll use this opportunity to learn more about GitHub CI.

[christophebedard]

Alright, ROS 2 CI passed, so this is ready! Thanks again for the PR.