watch: handle WATCH_INTERVAL

[airwoodix]

Resolves #25.

Handle WATCH_INTERVAL, as override for the -n, --interval option in watch.

[Krysztal112233]

Ah, thanks for your contributing and please fix CI failure, you have to format your code using rustfmt :)

[airwoodix]

Thanks for the prompt feedback! The code should now be properly formatted.

[Krysztal112233]

Ah, CI failed.

failures:

---- test_watch::test_interval_environment_variable stdout ----
run: /Users/runner/work/procps/procps/target/debug/procps watch echo -n hello

thread 'test_watch::test_interval_environment_variable' panicked at tests/by-util/test_watch.rs:86:10:
assertion failed: `(left == right)`: stdout as bytes wasn't equal to expected bytes. Result as strings:
stdout  ='Ok("-n hello\n-n hello\n")'
expected='Ok("hellohello")'

Diff < left / right > :
 [
<    45,
<    110,
<    32,
     104,
     101,
     108,
     108,
     111,
<    10,
<    45,
<    110,
<    32,
     104,
     101,
     108,
     108,
     111,
<    10,
 ]




failures:
    test_watch::test_interval_environment_variable

test result: FAILED. 82 passed; 1 failed; 0 ignored; 0 measured; 0 filtered out; finished in 2.63s

error: test failed, to rerun pass `-p procps --test tests`

could you please fix it?

[airwoodix]

Sorry for the delay. I'll get back to this when I have time to debug this apparently macos-specific issue (the test passes locally on my linux machine - the linux CI didn't run yet on this branch).

[cakebaker]

Can you please run cargo fmt?

[cakebaker]

Thanks for your PR!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 0.00%. Comparing base (c597cc6) to head (20d7f29).
Report is 5 commits behind head on main.

Additional details and impacted files

@@     Coverage Diff     @@
##   main   #363   +/-   ##
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