# Non-predefined variables must be escaped with "$$" (e.g. "$$FOO"); see
# https://bazel.build/reference/be/make-variables#predefined_label_variables.
_SCRIPT = """
# Add the "go" binary to PATH.
GO_PATH=$$(realpath $$(dirname $(rootpath @go_sdk//:bin/go)))
export PATH=$$GO_PATH:$$PATH

# Path to the "errcheck" binary.
ERRCHECK=$$(realpath $(rootpath @com_github_kisielk_errcheck//:errcheck))

# Change into the directory where Bazel was invoked.
cd $$BUILD_WORKING_DIRECTORY

$$ERRCHECK $$@
"""

genrule(
    name = "gen_script",
    outs = ["errcheck.sh"],
    cmd = "echo '%s' > $@" % _SCRIPT,
    exec_tools = [
        "@com_github_kisielk_errcheck//:errcheck",
        "@go_sdk//:bin/go",
    ],
)

# Wrapper script around the "errcheck" binary.
#
# Errcheck requires the "go" binary to be in PATH. This scripts adds the Bazel-downloaded "go"
# binary to PATH, then forwards all command-line arguments to the "errcheck" binary.
#
# Reference: https://bazel.build/reference/be/shell#sh_binary.
sh_binary(
    name = "errcheck",
    srcs = ["errcheck.sh"],
    data = [
        "@com_github_kisielk_errcheck//:errcheck",
        "@go_sdk//:bin/go",
    ],
    visibility = ["//visibility:public"],
)