terraform/command/arguments/output.go

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package arguments
import (
"github.com/hashicorp/terraform/tfdiags"
)
// Output represents the command-line arguments for the output command.
type Output struct {
// Name identifies which root module output to show. If empty, show all
// outputs.
Name string
// StatePath is an optional path to a state file, from which outputs will
// be loaded.
StatePath string
// ViewType specifies which output format to use: human, JSON, or "raw".
ViewType ViewType
}
// ParseOutput processes CLI arguments, returning an Output value and errors.
// If errors are encountered, an Output value is still returned representing
// the best effort interpretation of the arguments.
func ParseOutput(args []string) (*Output, tfdiags.Diagnostics) {
var diags tfdiags.Diagnostics
output := &Output{}
var jsonOutput, rawOutput bool
var statePath string
cmdFlags := defaultFlagSet("output")
cmdFlags.BoolVar(&jsonOutput, "json", false, "json")
cmdFlags.BoolVar(&rawOutput, "raw", false, "raw")
cmdFlags.StringVar(&statePath, "state", "", "path")
if err := cmdFlags.Parse(args); err != nil {
diags = diags.Append(tfdiags.Sourceless(
tfdiags.Error,
"Failed to parse command-line flags",
err.Error(),
))
}
args = cmdFlags.Args()
if len(args) > 1 {
diags = diags.Append(tfdiags.Sourceless(
tfdiags.Error,
"Unexpected argument",
"The output command expects exactly one argument with the name of an output variable or no arguments to show all outputs.",
))
}
if jsonOutput && rawOutput {
diags = diags.Append(tfdiags.Sourceless(
tfdiags.Error,
"Invalid output format",
"The -raw and -json options are mutually-exclusive.",
))
// Since the desired output format is unknowable, fall back to default
jsonOutput = false
rawOutput = false
}
output.StatePath = statePath
if len(args) > 0 {
output.Name = args[0]
}
if rawOutput && output.Name == "" {
diags = diags.Append(tfdiags.Sourceless(
tfdiags.Error,
"Output name required",
"You must give the name of a single output value when using the -raw option.",
))
}
switch {
case jsonOutput:
output.ViewType = ViewJSON
case rawOutput:
output.ViewType = ViewRaw
default:
output.ViewType = ViewHuman
}
return output, diags
}