chore: initial commit

command_root.go

@@ -0,0 +1,80 @@
+package main
+
+import (
+	"os"
+	"path/filepath"
+	"strings"
+
+	"github.com/spf13/cobra"
+	"github.com/spf13/viper"
+)
+
+func rootCommand() (*cobra.Command, error) {
+	cmd := &cobra.Command{
+		Use:   "evm",
+		Short: "A simple and opinionated Emacs Version Manager and build tool.",
+	}
+
+	mode := os.Getenv("EVM_MODE")
+	if mode != "system" {
+		mode = "user"
+	}
+
+	viper.SetDefault("mode", mode)
+
+	rootDir := filepath.Join(string(os.PathSeparator), "opt", "evm")
+	if mode == "user" {
+		rootDir = filepath.Join("$HOME", ".evm")
+	}
+
+	cmd.PersistentFlags().String("root", rootDir, "Root directory")
+	viper.SetDefault("path.root", rootDir)
+	err := viper.BindPFlag(
+		"path.root", cmd.PersistentFlags().Lookup("root"),
+	)
+	if err != nil {
+		return nil, err
+	}
+
+	err = viper.BindEnv("path.root", "EVM_ROOT")
+	if err != nil {
+		return nil, err
+	}
+
+	viper.SetDefault("path.shims", filepath.Join("$EVM_ROOT", "shims"))
+	viper.SetDefault("path.sources", filepath.Join("$EVM_ROOT", "sources"))
+	viper.SetDefault("path.versions", filepath.Join("$EVM_ROOT", "versions"))
+
+	infoCmd, err := configCommand()
+	if err != nil {
+		return nil, err
+	}
+
+	listCmd, err := listCommand()
+	if err != nil {
+		return nil, err
+	}
+
+	useCmd, err := useCommand()
+	if err != nil {
+		return nil, err
+	}
+
+	execCmd, err := execCommand()
+	if err != nil {
+		return nil, err
+	}
+
+	cmd.AddCommand(
+		infoCmd,
+		listCmd,
+		useCmd,
+		execCmd,
+	)
+
+	viper.SetEnvKeyReplacer(strings.NewReplacer(".", "_"))
+	viper.SetEnvPrefix("evm")
+	viper.AutomaticEnv()
+
+	return cmd, nil
+}