Support select() in refresh_compile_commands macro

[yrom]

e.g., from https://bazel.build/docs/configurable-attributes#configurable-build-example:

# BUILD 

cc_binary(
    name = "mybinary",
    srcs = ["main.cc"],
    deps = select({
        ":arm_build": [":arm_lib"],
        ":x86_debug_build": [":x86_dev_lib"],
        "//conditions:default": [":generic_lib"],
    }),
)

config_setting(
    name = "arm_build",
    values = {"cpu": "arm"},
)

config_setting(
    name = "x86_debug_build",
    values = {
        "cpu": "x86",
        "compilation_mode": "dbg",
    },
)

refresh_compile_commands(
    name = "refresh_mybinary_commands",

    targets = select({
      ":arm_build":{ "//:mybinary": "--cpu=arm"},
      ":x86_debug_build":{ "//:mybinary": "-c dbg --cpu=x86"},
      "//conditions:default": { "//:mybinary": ""},
    }),
)

Run bazel //:refresh_mybinary_commands --cpu=arm will select the ":arm_build" config.

See more details: https://bazel.build/docs/configurable-attributes#faq-select-macro

[cpsauer]

@yrom, thank you! This is a great improvement. I appreciate your taking the time to leave things better than you found them.

[I wish bazel supported select introspection so we could perform the same argument type transformations on the select, but hey.]

Anyway, again, thank you.

[dambrosio]

Bazel N00b here but wondering if there is a way to pass a target to refresh_compile_commands using select().

Something like:

# BUILD

config_setting(
    name = "refresh_comp_cmds_target",
    values = {"define": "target="},
)

refresh_compile_commands(
    name = "refresh_comp_cmds",
    targets = select({
        ":refresh_comp_cmds_target": {"$(target)": ""},
        "//condition:default": {"//...": ""},
    }),
)

When I try and run:
bazel run :refresh_comp_cmds --define target=//my_pkg:my_target
or
bazel run :refresh_comp_cmds

I get the following error:

ERROR: Traceback (most recent call last):
        File "/.../BUILD", line 21, column 25, in <toplevel>
                refresh_compile_commands(
        File "/.../external/hedron_compile_commands/refresh_compile_commands.bzl", line 82, column 37, in refresh_compile_commands
                for target, flags in targets.items()
Error: 'select' value has no field or method 'items'

This is on commit: a14ad3a

Any help would be appreciated and thank you!