add __verbose() (IDFGH-3923)

[rwalker-apple]

Problem

export.sh is noisy for projects that invoke the script for every build

Proposed changes

• move verbose echoes to __verbose()
• namespace other functions that get unset

[Alvin1Zhang]

Thanks for contribution.

[igrr]

Thanks for the PR @rwalker-apple! I will combine this with the other proposed change to export.sh, which fixes the return code, if you don't mind: #5744.

Edit: this will also need similar changes in export.bat, export.ps1 and export.fish. We can do them on top of your commit unless you prefer to handle that.

[igrr]

Sorry, i just ran shellcheck and realized that this [[ won't work in dash. Can fix this up while rebasing on the other PR i've mentioned or leave this to you, if you prefer.

[igrr]

One more thing, how do you feel about using IDF_EXPORT_QUIET or IDF_TOOLS_QUIET instead of IDF_QUIET? I'm afraid that IDF_QUIET would imply to users that all the tools would disable output. Meeting that expectation would require quite a bit more changes to be added.

[rwalker-apple]

@igrr please take it from here and do as you see fit. Just some suggestions. Thanks for the portability check.

[rwalker-apple]

@igrr are you going to assume responsibility for this?

[igrr]

Sorry, have missed your previous comment. Sure, can take it from here. Thank you.

[rwalker-apple]

@igrr, do you intend to work on this branch, or should I close the PR?

[igrr]

Let's keep it open, and it should get closed automatically when the combined changes from the PR and #5744 are merged into master.

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.

---

Rob Walker seems not to be a GitHub user. You need a GitHub account to be able to sign the CLA. If you have already a GitHub account, please add the email address used for this commit to your account.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}