cue eval test.cue -t env=prod
cmp stdout expect-stdout

cue eval vars.cue -T
cmp stdout expect-stdout-vars

cue eval vars.cue -T -t dir=xxx
cmp stdout expect-stdout-override

cue eval vars.cue
cmp stdout expect-stdout-novars

! cue eval -T err.cue
cmp stderr expect-stderr-err

cue cmd user vars.cue vars_tool.cue
cmp stdout expect-stdout-tool

# TODO: report errors for invalid tags?

-- test.cue --
{
    environment: "prod" | "staging" @tag(env,short=prod|staging)
}

-- expect-stdout --
environment: "prod"
-- vars.cue --
import "path"

_os: string @tag(os,var=os)
_dir: string @tag(dir,var=cwd)

base: path.Base(_dir, _os)

-- err.cue --
dir: string @tag(dir,var=userz)

-- vars_tool.cue --
import (
    "path"
    "tool/cli"
)

wd: string @tag(wd,var=cwd)
_os: string @tag(os,var=os)

command: user: {
    base: cli.Print & { text: path.Base(wd, _os) }
}

-- expect-stdout-vars --
base: "script-inject"
-- expect-stderr-err --
tag variable 'userz' not found
-- expect-stdout-override --
base: "xxx"
-- expect-stdout-novars --
import "path"

base: path.Base(_dir, _os)
-- expect-stdout-tool --
script-inject