List dev-platform targets with a new --list-targets option

[weberw]

Configuration

Operating system: all

PlatformIO Version (platformio --version): 4.3.4

Description of problem

According to https://docs.platformio.org/en/stable/projectconf/section_env_build.html#targets running platformio run --target should produce a list of targets, however an error is generated instead

Steps to Reproduce

1. platformio run --target

Actual Results

Error: --target option requires an argument

Expected Results

A list of build targets

If problems with PlatformI

[jnr2820]

I'm seeing this too.

pio run --target
Error: --target option requires an argument

pio --version
PlatformIO, version 4.3.4

[ivankravets]

Thanks! Indeed, this feature has not been implemented yet. I renamed this issue.

[ivankravets]

Please re-test with pio upgrade --dev version of PIO core. See https://docs.platformio.org/en/latest/core/userguide/cmd_run.html#cmdoption-platformio-run-list-targets

[jnr2820]

It's working for me. (Also, it is very neat. Thank you)