如何在字符串数组上循环

Question

I've command line tool which implemented with golang, which works OK. I want to execute some command that should provide list of strings

apps := $(shell fxt run apps)
apps:
    @echo $(apps) is called

in the terminal I see the following while executing make (which is totally fine)

[app1 app2] is called

Since the command fxt run apps return array of string (var apps []string)

My question is how can I loop over the apps variable?

the data which is returned by the command is fine, but now I need to take this list (app1... appN) and loop over it, the issue which is not clear to me, how can I loop over array of strings?

special case is if in the list of theloop I got app7 how should do a fork in the code for example if(app7) prints mvn clean install

example.

for each app (in the app list) I need to run command

go test ./...

But for app7 in need to run

mvn clean install

and for app10

yarn

Answer 1

You want to run your loop inside make itself or in the recipe which is in fact executing a shell? Here you have both!

Remark: I replace the executed command to test it myself. Here I use ls to fill my array.

apps := $(shell ls)

#looping in make itself
$(foreach var,$(apps),$(info In the loop running with make: $(var)))

#loop in shell inside recipe 
go:
    @for v in $(apps) ; do \
        echo inside recipe loop with sh command: $$v ; \
    done

Output:

In the loop running with make: a
In the loop running with make: b
In the loop running with make: c
In the loop running with make: Makefile
inside recipe loop with sh command: a
inside recipe loop with sh command: b
inside recipe loop with sh command: c
inside recipe loop with sh command: Makefile