The build runner doesn't clear the progress line when running zig build run

[mikastiv]

Zig Version

v0.12.0-dev.2641+ee36131e6

Steps to Reproduce and Observed Behavior

The output of the build runner after running zig build run is mixed with the executable output when it needs to compile files

Repro steps:

• Create a new zig project with zig init
• Execute zig build run
• Observe the output

I get this:

~/zigdev/playground via ↯ v0.12.0-dev.2641+ee36131e6
❯ zig build run
steps [25/29] zig build-exe playground Debug native... LLVM Emit Object... All your codebase are belong to us.
Run `zig build test` to run the tests.

I reproduce this on windows 10 and WSL with both VSCode's terminal and the Windows Terminal; On macOS Catalina with iTerm and also on Linux with kitty

Expected Behavior

I would expect the build runner output to be cleared.

~/zigdev/playground via ↯ v0.12.0-dev.2641+ee36131e6
❯ zig build run
All your codebase are belong to us.
Run `zig build test` to run the tests.

[mikastiv]

I looked around a bit in the code and from what I understood, the "run step" itself depends on running the executable. So it waits for it to finish execution before clearing the line, but when the executable exits, stdout already has printed lines in the terminal.

The best I was able to get by calling refresh() on progress nodes is:

~/zigdev/playground via ↯ v0.12.0-dev.2641+ee36131e6
❯ zig build run
steps [28/29] run playground All your codebase are belong to us.
Run `zig build test` to run the tests.