How to process the arguments

[naskya]

Setup

$ tree .                    
.
├── foo
│   └── Makefile.toml
└── Makefile.toml

2 directories, 2 files

# Makefile.toml

extend = [
  { path = "foo/Makefile.toml" },
  # will be extended in future
]

[tasks.subcommand]
private = true
script = '''
#!@duckscript

cm_run_task ${SUBCOMMAND_PREFIX}_${1}
'''

# foo/Makefile.toml

[tasks.foo]
private = false
extend = "subcommand"
env = { "SUBCOMMAND_PREFIX" = "foo" }

[tasks.foo_create]
cwd = "foo"
command = "touch"
args = ["${@}.out"]

Question

When executing cargo make foo_create test, ${@} expands to "test" and "touch" "test.out" is executed. However, when executing cargo make foo create test, ${@} expands to "create" "test" and "touch" "create.out" "test.out" is executed, causing inconsistent behavior.

To align the behavior (or rather, because I want to exclude create from the arguments when executing foo create test), I would like to retrieve only the last argument. However, it seems that bash syntax like ${@: -1} doesn’t work in this case.

Given this situation, what would be the best way to process the arguments? I think it’s possible by writing a script, but as the number of commands increases, it becomes cumbersome to write argument handling for each command. If there is a better solution, please let me know.

$ cargo make foo_create test
[cargo-make] INFO - cargo make 0.37.24
[cargo-make] INFO - 
[cargo-make] INFO - Build File: Makefile.toml
[cargo-make] INFO - Task: foo_create
[cargo-make] INFO - Profile: development
[cargo-make] INFO - Execute Command: "touch" "test.out"
[cargo-make] INFO - Build Done in 0.23 seconds.

$ cargo make foo create test
[cargo-make] INFO - cargo make 0.37.24
[cargo-make] INFO - 
[cargo-make] INFO - Build File: Makefile.toml
[cargo-make] INFO - Task: foo
[cargo-make] INFO - Profile: development
[cargo-make] INFO - Running Task: foo
[cargo-make] INFO - Execute Command: "touch" "create.out" "test.out"
[cargo-make] INFO - Build Done in 0.25 seconds.