Move template locator and reader code into new limatmpl package

It was part of cmd/limactl/start.go but should be generally reusable code.
Moved related cmd/limactl/guessarg into limatmpl as well.

Also created a new `limactl template` command.

It takes a single template locator argument, loads the template,
and writes it to STDOUT.

This is currently not very interesting; it is in preparation of
implementing composable (multi-file) templates.

Signed-off-by: Jan Dubois <[email protected]>

cmd/limactl/edit.go

@@ -8,9 +8,9 @@ import (
 	"path/filepath"
 
 	"github.com/lima-vm/lima/cmd/limactl/editflags"
-	"github.com/lima-vm/lima/cmd/limactl/guessarg"
 	"github.com/lima-vm/lima/pkg/editutil"
 	"github.com/lima-vm/lima/pkg/instance"
+	"github.com/lima-vm/lima/pkg/limatmpl"
 	"github.com/lima-vm/lima/pkg/limayaml"
 	networks "github.com/lima-vm/lima/pkg/networks/reconcile"
 	"github.com/lima-vm/lima/pkg/store"
@@ -44,7 +44,7 @@ func editAction(cmd *cobra.Command, args []string) error {
 	var err error
 	var inst *store.Instance
 	switch {
-	case guessarg.SeemsYAMLPath(arg):
+	case limatmpl.SeemsYAMLPath(arg):
 		// absolute path is required for `limayaml.Validate`
 		filePath, err = filepath.Abs(arg)
 		if err != nil {

cmd/limactl/main.go

@@ -155,6 +155,7 @@ func newApp() *cobra.Command {
 		newProtectCommand(),
 		newUnprotectCommand(),
 		newTunnelCommand(),
+		newTemplateCommand(),
 	)
 	if runtime.GOOS == "darwin" || runtime.GOOS == "linux" {
 		rootCmd.AddCommand(startAtLoginCommand())