syntax: simplify unset-or-null with null default to just unset #849
Conversation
If the default for an unset-or-null parameter expansion is null, the or-null part of the expansion is redundant and can be removed. The result is null on match either way.
scop
force-pushed
the
unset-or-null-null-default
branch
from
2755b94 to
5635541
Compare
|
Docker build failure/timeout appears unrelated. |
|
I'm slightly uneasy about simplifications like these. Are you absolutely sure that this can't break user programs? I wonder if turning an unset to null can matter, for example. |
|
I cannot think of a case that this could break. There certainly is a difference between unset and null valued variables (for example |
|
Alright, SGTM. We can always revert if our thinking here is wrong. |
Example failed workflow: https://github.com/dfinity/sdk/actions/runs/3697173489/jobs/6262516972 This is the change to shfmt 3.6.0: mvdan/sh#849 - Simplify ${name:-} to the equivalent ${name-} - #849
Example failed workflow: https://github.com/dfinity/sdk/actions/runs/3697173489/jobs/6262516972 This is the change introduced in shfmt 3.6.0: mvdan/sh#849 - `Simplify ${name:-} to the equivalent ${name-}` - [#849](mvdan/sh#849)
ref: mvdan/sh#849 Signed-off-by: Abirdcfly <fp544037857@gmail.com>
ref: mvdan/sh#849 Signed-off-by: Abirdcfly <fp544037857@gmail.com>
If the default for an unset-or-null parameter expansion is null, the or-null part of the expansion is redundant and can be removed. The result is null on match either way.