ashb opened a new pull request #15970:
URL: https://github.com/apache/airflow/pull/15970
The prepare_usage command was being called and setting variables to produce
the full usage text for all commands at start up -- and while this isn't a
problem for speed, it makes the output when running with `bash
-x`/`VERBOSE_COMMANDS` a **lot** longer.
This change delays creating the usage variables and formatted versions until
they are needed.
Net result when running this command:
```sh
bash -c 'exec 5>breeze-trace.log; export BASH_XTRACEFD=5;
VERBOSE_COMMANDS=true VERBOSE=true ./breeze -n shell -- -c "true"'
```
Before 4500 lines, 204K of "trace" logs
```
❯ wc -lc breeze-trace.log
4528 204088 breeze-trace.log
```
After is 1/4 as much output:
```
❯ wc -lc breeze-trace-with-change.log
1402 68167 breeze-trace-with-change.log
```
This PR has no functional impact on the breeze script (I tested `flags`,
`help`, `help-all` and `--help` on subcommands, all produce the same output)
but makes it easier to debug breeze commands.
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