command/views: main View type aware if it's running in automation

This "running in automation" idea is a best effort thing where we try to
avoid printing out specific suggestions of commands to run in the main
workflow when the user is running Terraform inside a wrapper script or
other automation, because they probably don't want to bypass that
automation.

This just makes that information available to the main views.View type,
so we can then make use of it in the implementation of more specialized
view types that embed views.View.

However, nothing is using it as of this commit. We'll use it in later
commits.

command/views/view.go

@@ -17,6 +17,13 @@ type View struct {
 
 	compactWarnings bool
 
+	// When this is true it's a hint that Terraform is being run indirectly
+	// via a wrapper script or other automation and so we may wish to replace
+	// direct examples of commands to run with more conceptual directions.
+	// However, we only do this on a best-effort basis, typically prioritizing
+	// the messages that users are most likely to see.
+	runningInAutomation bool
+
 	// This unfortunate wart is required to enable rendering of diagnostics which
 	// have associated source code in the configuration. This function pointer
 	// will be dereferenced as late as possible when rendering diagnostics in
@@ -38,6 +45,18 @@ func NewView(streams *terminal.Streams) *View {
 	}
 }
 
+// SetRunningInAutomation modifies the view's "running in automation" flag,
+// which causes some slight adjustments to certain messages that would normally
+// suggest specific Terraform commands to run, to make more conceptual gestures
+// instead for situations where the user isn't running Terraform directly.
+//
+// For convenient use during initialization (in conjunction with NewView),
+// SetRunningInAutomation returns the reciever after modifying it.
+func (v *View) SetRunningInAutomation(new bool) *View {
+	v.runningInAutomation = new
+	return v
+}
+
 // Configure applies the global view configuration flags.
 func (v *View) Configure(view *arguments.View) {
 	v.colorize.Disable = view.NoColor

commands.go

@@ -82,7 +82,7 @@ func initCommands(
 	meta := command.Meta{
 		OriginalWorkingDir: originalWorkingDir,
 		Streams:            streams,
-		View:               views.NewView(streams),
+		View:               views.NewView(streams).SetRunningInAutomation(inAutomation),
 
 		Color:            true,
 		GlobalPluginDirs: globalPluginDirs(),