feat: Add "coder" CLI (#221)

* feat: Add "coder" CLI

* Add CLI test for login

* Add "bin/coder" target to Makefile

* Update promptui to fix race

* Fix error scope

* Don't run CLI tests on Windows

* Fix requested changes

cli/root.go

@@ -0,0 +1,170 @@
+package cli
+
+import (
+	"fmt"
+	"io"
+	"net/url"
+	"os"
+	"strings"
+
+	"github.com/fatih/color"
+	"github.com/kirsle/configdir"
+	"github.com/manifoldco/promptui"
+	"github.com/mattn/go-isatty"
+	"github.com/spf13/cobra"
+	"golang.org/x/xerrors"
+
+	"github.com/coder/coder/cli/config"
+	"github.com/coder/coder/coderd"
+	"github.com/coder/coder/codersdk"
+)
+
+const (
+	varGlobalConfig = "global-config"
+)
+
+func Root() *cobra.Command {
+	cmd := &cobra.Command{
+		Use: "coder",
+		Long: `    ▄█▀    ▀█▄
+     ▄▄ ▀▀▀  █▌   ██▀▀█▄          ▐█
+ ▄▄██▀▀█▄▄▄  ██  ██      █▀▀█ ▐█▀▀██ ▄█▀▀█ █▀▀
+█▌   ▄▌   ▐█ █▌  ▀█▄▄▄█▌ █  █ ▐█  ██ ██▀▀  █
+     ██████▀▄█    ▀▀▀▀   ▀▀▀▀  ▀▀▀▀▀  ▀▀▀▀ ▀
+  ` + color.New(color.Underline).Sprint("Self-hosted developer workspaces on your infra") + `
+
+`,
+		Example: `
+  - Create a project for developers to create workspaces
+
+    ` + color.New(color.FgHiMagenta).Sprint("$ coder projects create <directory>") + `		
+
+  - Create a workspace for a specific project
+
+    ` + color.New(color.FgHiMagenta).Sprint("$ coder workspaces create <project>") + `
+	
+  - Maintain consistency by updating a workspace
+
+    ` + color.New(color.FgHiMagenta).Sprint("$ coder workspaces update <workspace>"),
+	}
+	// Customizes the color of headings to make subcommands
+	// more visually appealing.
+	header := color.New(color.FgHiBlack)
+	cmd.SetUsageTemplate(strings.NewReplacer(
+		`Usage:`, header.Sprint("Usage:"),
+		`Examples:`, header.Sprint("Examples:"),
+		`Available Commands:`, header.Sprint("Commands:"),
+		`Global Flags:`, header.Sprint("Global Flags:"),
+		`Flags:`, header.Sprint("Flags:"),
+		`Additional help topics:`, header.Sprint("Additional help:"),
+	).Replace(cmd.UsageTemplate()))
+
+	cmd.AddCommand(login())
+	cmd.AddCommand(projects())
+	cmd.AddCommand(workspaces())
+	cmd.AddCommand(users())
+
+	cmd.PersistentFlags().String(varGlobalConfig, configdir.LocalConfig("coder"), "Path to the global `coder` config directory")
+
+	return cmd
+}
+
+func createClient(cmd *cobra.Command) (*codersdk.Client, error) {
+	root := createConfig(cmd)
+	rawURL, err := root.URL().Read()
+	if err != nil {
+		return nil, err
+	}
+	serverURL, err := url.Parse(rawURL)
+	if err != nil {
+		return nil, err
+	}
+	token, err := root.Session().Read()
+	if err != nil {
+		return nil, err
+	}
+	client := codersdk.New(serverURL)
+	return client, client.SetSessionToken(token)
+}
+
+func currentOrganization(cmd *cobra.Command, client *codersdk.Client) (coderd.Organization, error) {
+	orgs, err := client.UserOrganizations(cmd.Context(), "me")
+	if err != nil {
+		return coderd.Organization{}, nil
+	}
+	// For now, we won't use the config to set this.
+	// Eventually, we will support changing using "coder switch <org>"
+	return orgs[0], nil
+}
+
+func createConfig(cmd *cobra.Command) config.Root {
+	globalRoot, err := cmd.Flags().GetString(varGlobalConfig)
+	if err != nil {
+		panic(err)
+	}
+	return config.Root(globalRoot)
+}
+
+// isTTY returns whether the passed reader is a TTY or not.
+// This accepts a reader to work with Cobra's "InOrStdin"
+// function for simple testing.
+func isTTY(reader io.Reader) bool {
+	file, ok := reader.(*os.File)
+	if !ok {
+		return false
+	}
+	return isatty.IsTerminal(file.Fd())
+}
+
+func runPrompt(cmd *cobra.Command, prompt *promptui.Prompt) (string, error) {
+	var ok bool
+	prompt.Stdin, ok = cmd.InOrStdin().(io.ReadCloser)
+	if !ok {
+		return "", xerrors.New("stdin must be a readcloser")
+	}
+	prompt.Stdout, ok = cmd.OutOrStdout().(io.WriteCloser)
+	if !ok {
+		return "", xerrors.New("stdout must be a readcloser")
+	}
+
+	// The prompt library displays defaults in a jarring way for the user
+	// by attempting to autocomplete it. This sets no default enabling us
+	// to customize the display.
+	defaultValue := prompt.Default
+	if !prompt.IsConfirm {
+		prompt.Default = ""
+	}
+
+	// Rewrite the confirm template to remove bold, and fit to the Coder style.
+	confirmEnd := fmt.Sprintf("[y/%s] ", color.New(color.Bold).Sprint("N"))
+	if prompt.Default == "y" {
+		confirmEnd = fmt.Sprintf("[%s/n] ", color.New(color.Bold).Sprint("Y"))
+	}
+	confirm := color.HiBlackString("?") + ` {{ . }} ` + confirmEnd
+
+	// Customize to remove bold.
+	valid := color.HiBlackString("?") + " {{ . }} "
+	if defaultValue != "" {
+		valid += fmt.Sprintf("(%s) ", defaultValue)
+	}
+
+	success := valid
+	invalid := valid
+	if prompt.IsConfirm {
+		success = confirm
+		invalid = confirm
+	}
+
+	prompt.Templates = &promptui.PromptTemplates{
+		Confirm: confirm,
+		Success: success,
+		Invalid: invalid,
+		Valid:   valid,
+	}
+	value, err := prompt.Run()
+	if value == "" && !prompt.IsConfirm {
+		value = defaultValue
+	}
+
+	return value, err
+}