feat: add env command (#45)

* feat: add env command

* fix: add pad

* fix: hostname separator

* feat: remove enforced $H

* refactor: rename pkg to internal

* revert: hostname separation

embed/scaffold/init/$.posh/go.mod.gotext

@@ -1,6 +1,6 @@
 module {{ .module }}/posh
 
-go 1.19
+go 1.21
 
 replace (
 	github.com/c-bata/go-prompt v0.2.6 => github.com/franklinkim/go-prompt v0.2.7-0.20210427061716-a8f4995d7aa5

embed/scaffold/init/$.posh/internal/command/welcome.go.gotext

@@ -3,7 +3,7 @@ package command
 import (
 	"context"
 
-	"{{.module}}/posh/pkg/config"
+	"{{.module}}/posh/internal/config"
 	"github.com/foomo/posh/pkg/log"
 	"github.com/foomo/posh/pkg/readline"
 	"github.com/spf13/viper"

embed/scaffold/init/$.posh/internal/plugin.go.gotext

@@ -1,4 +1,4 @@
-package pkg
+package internal
 
 import (
 	"context"
@@ -15,7 +15,7 @@ import (
 	"github.com/foomo/posh/pkg/prompt/history"
 	"github.com/foomo/posh/pkg/readline"
 	"github.com/foomo/posh/pkg/require"
-	pkgcommand "{{.module}}/posh/pkg/command"
+	icommand "{{.module}}/posh/internal/command"
 )
 
 type Plugin struct {
@@ -39,8 +39,8 @@ func New(l log.Logger) (plugin.Plugin, error) {
 
 	// Welcome
 	inst.commands.MustAdd(
-		pkgcommand.NewWelcome(l,
-			pkgcommand.WelcomeWithConfigKey("welcome"),
+		icommand.NewWelcome(l,
+			icommand.WelcomeWithConfigKey("welcome"),
 		),
 	)
 

embed/scaffold/init/$.posh/main.go.gotext

@@ -1,12 +1,12 @@
 package main
 
 import (
-	"{{.module}}/posh/pkg"
+	"{{.module}}/posh/internal"
 	"github.com/foomo/posh/cmd"
 )
 
 func init() {
-	cmd.Init(pkg.New)
+	cmd.Init(internal.New)
 }
 
 func main() {

pkg/command/cache.go

@@ -33,11 +33,11 @@ func NewCache(l log.Logger, cache cache.Cache) *Cache {
 	}
 	inst.tree = tree.New(&tree.Node{
 		Name:        "cache",
-		Description: "manage the internal cache",
+		Description: "Manage the internal cache",
 		Nodes: tree.Nodes{
 			{
 				Name:        "clear",
-				Description: "clear caches",
+				Description: "Clear caches",
 				Args: tree.Args{
 					{
 						Name:        "Namespace",
@@ -53,7 +53,7 @@ func NewCache(l log.Logger, cache cache.Cache) *Cache {
 			},
 			{
 				Name:        "list",
-				Description: "list all caches",
+				Description: "List all caches",
 				Execute:     inst.list,
 			},
 		},

pkg/command/env.go

@@ -0,0 +1,111 @@
+package command
+
+import (
+	"context"
+	"os"
+	"strings"
+
+	"github.com/foomo/posh/pkg/command/tree"
+	"github.com/foomo/posh/pkg/log"
+	"github.com/foomo/posh/pkg/prompt/goprompt"
+	"github.com/foomo/posh/pkg/readline"
+	"github.com/pterm/pterm"
+)
+
+type Env struct {
+	l    log.Logger
+	tree tree.Root
+}
+
+// ------------------------------------------------------------------------------------------------
+// ~ Constructor
+// ------------------------------------------------------------------------------------------------
+
+func NewEnv(l log.Logger) *Env {
+	inst := &Env{
+		l: l,
+	}
+	inst.tree = tree.New(&tree.Node{
+		Name:        "env",
+		Description: "Manage internal environment variables",
+		Nodes: tree.Nodes{
+			{
+				Name:        "list",
+				Description: "List all environment variables",
+				Execute:     inst.list,
+			},
+			{
+				Name:        "set",
+				Description: "Set an internal environment variable",
+				Args: tree.Args{
+					{
+						Name:        "Key",
+						Description: "Key of the environment variable.",
+					},
+					{
+						Name:        "Value",
+						Optional:    true,
+						Description: "Value of the environment variable.",
+					},
+				},
+				Execute: inst.set,
+			},
+			{
+				Name:        "unset",
+				Description: "Unset an environment variable",
+				Args: tree.Args{
+					{
+						Name:        "Key",
+						Description: "Key of the environment variable.",
+					},
+				},
+				Execute: inst.unset,
+			},
+		},
+	})
+	return inst
+}
+
+// ------------------------------------------------------------------------------------------------
+// ~ Public methods
+// ------------------------------------------------------------------------------------------------
+
+func (c *Env) Name() string {
+	return c.tree.Node().Name
+}
+
+func (c *Env) Description() string {
+	return c.tree.Node().Description
+}
+
+func (c *Env) Complete(ctx context.Context, r *readline.Readline) []goprompt.Suggest {
+	return c.tree.Complete(ctx, r)
+}
+
+func (c *Env) Execute(ctx context.Context, r *readline.Readline) error {
+	return c.tree.Execute(ctx, r)
+}
+
+func (c *Env) Help(ctx context.Context, r *readline.Readline) string {
+	return c.tree.Help(ctx, r)
+}
+
+// ------------------------------------------------------------------------------------------------
+// ~ Private methods
+// ------------------------------------------------------------------------------------------------
+
+func (c *Env) set(ctx context.Context, r *readline.Readline) error {
+	return os.Setenv(r.Args().At(0), r.Args().AtDefault(1, ""))
+}
+
+func (c *Env) unset(ctx context.Context, r *readline.Readline) error {
+	return os.Unsetenv(r.Args().At(0))
+}
+
+func (c *Env) list(ctx context.Context, r *readline.Readline) error {
+	data := pterm.TableData{{"Name", "Value"}}
+	for _, s := range os.Environ() {
+		data = append(data, strings.SplitN(s, "=", 2))
+	}
+	return pterm.DefaultTable.WithHasHeader(true).WithData(data).Render()
+}

pkg/command/tree/node.go

@@ -134,19 +134,20 @@ func (c *Node) find(ctx context.Context, r *readline.Readline, i int) (*Node, in
 }
 
 func (c *Node) help(ctx context.Context, r *readline.Readline) string {
+	pad := "      "
 	ret := c.Description
 
 	if len(c.Nodes) > 0 {
 		ret += "\n\nUsage:\n"
-		ret += "      " + c.Name + " [command]"
+		ret += pad + c.Name + " [command]"
 
 		ret += "\n\nAvailable Commands:\n"
 		for _, node := range c.Nodes {
-			ret += "      " + xstrings.PadEnd(node.Name, " ", 30) + node.Description + "\n"
+			ret += pad + xstrings.PadEnd(node.Name, " ", 30) + node.Description + "\n"
 		}
 	} else {
 		ret += "\n\nUsage:\n"
-		ret += "      " + c.Name
+		ret += pad + c.Name
 
 		for _, arg := range c.Args {
 			ret += " "
@@ -167,7 +168,7 @@ func (c *Node) help(ctx context.Context, r *readline.Readline) string {
 		if len(c.Args) > 0 {
 			ret += "\n\nArguments:\n"
 			for _, arg := range c.Args {
-				ret += "      " + xstrings.PadEnd(arg.Name, " ", 30) + arg.Description + "\n"
+				ret += pad + xstrings.PadEnd(arg.Name, " ", 30) + arg.Description + "\n"
 			}
 		}
 

pkg/command/tree/root_test.go

@@ -31,7 +31,7 @@ func TestRoot(t *testing.T) {
 
 	r := tree.New(&tree.Node{
 		Name:        "root",
-		Description: "root tree",
+		Description: "Root tree",
 		Execute: func(ctx context.Context, r *readline.Readline) error {
 			return ErrRoot
 		},

pkg/prompt/flair/flair.go

@@ -11,7 +11,7 @@ func DefaultFlair(title string) error {
 	pterm.FgGray.Println()
 	if err := pterm.DefaultBigText.WithLetters(
 		putils.LettersFromStringWithStyle(strings.ToUpper(title), pterm.NewStyle(pterm.FgCyan)),
-		putils.LettersFromStringWithStyle("$H", pterm.NewStyle(pterm.FgGreen))).
+	).
 		Render(); err != nil {
 		return err
 	}

pkg/prompt/prompt.go

@@ -289,7 +289,7 @@ func (s *Prompt) complete(d prompt.Document) []prompt.Suggest {
 	if s.readline.IsModeDefault() && s.readline.Args().LenIs(0) {
 		var suggests []prompt.Suggest
 		for key, value := range s.aliases {
-			suggests = append(suggests, prompt.Suggest{Text: key, Description: "alias: " + value})
+			suggests = append(suggests, prompt.Suggest{Text: key, Description: "Alias: " + value})
 		}
 		for _, inst := range s.Commands().List() {
 			suggests = append(suggests, prompt.Suggest{Text: inst.Name(), Description: inst.Description()})

pkg/readline/args.go

@@ -14,6 +14,14 @@ func (a Args) At(v int) string {
 	}
 }
 
+func (a Args) AtDefault(v int, fallback string) string {
+	if a.HasIndex(v) {
+		return a[v]
+	} else {
+		return fallback
+	}
+}
+
 func (a Args) Shift() (string, Args) {
 	if a.HasIndex(0) {
 		return a[0], a[1:]