New remove_empty function

[sagiegurari]

Features Description
now that we have functions, I can add remove_empty function that will remove empty command line arguments.
for example

args = ["@@remove_empty(SOME_EMPTY_ENV_VAR)"]

if SOME_EMPTY_ENV_VAR env var is empty, that arg will be removed from the arg list.

[ssokolow]

I'm not sure how this would be useful. What does it do if SOME_EMPTY_ENV_VAR is not empty?

[sagiegurari]

it keeps the value.
I will give some example usage scenario:

# core file
[env]
BUILD_ALL_FEATURES_OPTION="--all-features"

[tasks.build]
description = "Runs the rust compiler."
category = "Build"
command = "cargo"
args = ["build", "@@remove-empty(BUILD_ALL_FEATURES_OPTION)"]

to turn off the all features flag in the extended file you can simply do

# extended file
[env]
BUILD_ALL_FEATURES_OPTION=""

now.... without remove-empty function, the cargo build would also get another command line argument which is an empty string that will cause it to fail.
with remove-empty, the argument is simply removed completely before invoking cargo.

[ssokolow]

By the time I read your explanation here, I'd already seen the documentation for it above the documentation you linked to for trim, but thank you for the effort involved in writing a second, different explanation.