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Have a makefile in which rule dev-create-empty-migration, currently, this rule has hardcoded argument accounts_table, this argument should not be hardcoded but should be passed as an argument at the time of rule invocation. e. g. make dev-create-empty-migration accounts_table.

Any ideas how to do that?

.PHONY: dev-create-empty-migration
dev-create-empty-migration:
    migrate create -ext sql -dir
./pkg/acc/repo/postgres/migrations accounts_table
Amira Bedhiafi
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Apollo111
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1 Answers1

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You should use a variable and store something in it. By using ?=, make first searches for an argument. If found, it uses the argument, otherwise the default content.

$ cat Makefile 
VAR     ?= derp
test:
        @echo $(VAR)
$ make
derp
$ make VAR=lala
lala

Just because it's fun, you can also do something as follows. This omits the use of additional arguments, but you could of course make some hybrid. 

$ cat Makefile 
VAR     := None

dev-create-empty-migration-%_table:
        $(eval VAR=$(patsubst dev-create-empty-migration-%,%,$@))
        @echo $(VAR)
$ make dev-create-empty-migration-derp_table
derp_table
Bayou
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