Add interactive configuration

This adds a new --config flag and rearranges some config fields.

app.go

@@ -36,6 +36,7 @@ var shttp = http.NewServeMux()
 
 func Serve() {
 	createConfig := flag.Bool("create-config", false, "Creates a basic configuration and exits")
+	doConfig := flag.Bool("config", false, "Run the configuration process")
 	flag.Parse()
 
 	if *createConfig {
@@ -48,6 +49,13 @@ func Serve() {
 			os.Exit(1)
 		}
 		os.Exit(0)
+	} else if *doConfig {
+		err := config.Configure()
+		if err != nil {
+			log.Error("Unable to configure: %v", err)
+			os.Exit(1)
+		}
+		os.Exit(0)
 	}
 
 	log.Info("Initializing...")

config/config.go

@@ -5,7 +5,7 @@ import (
 )
 
 const (
-	configFile = "config.ini"
+	FileName = "config.ini"
 )
 
 type (
@@ -24,18 +24,22 @@ type (
 	}
 
 	AppCfg struct {
-		MultiUser   bool `ini:"multiuser"`
+		SiteName string `ini:"site_name"`
-		OpenSignups bool `ini:"open_signups"`
+
+		// Site appearance
+		Theme      string `ini:"theme"`
+		JSDisabled bool   `ini:"disable_js"`
+		WebFonts   bool   `ini:"webfonts"`
+
+		// Users
+		SingleUser       bool `ini:"single_user"`
+		OpenRegistration bool `ini:"open_registration"`
+		MinUsernameLen   int  `ini:"min_username_len"`
+
+		// Federation
 		Federation  bool `ini:"federation"`
 		PublicStats bool `ini:"public_stats"`
 		Private     bool `ini:"private"`
-
-		Name string `ini:"site_name"`
-
-		JSDisabled bool `ini:"disable_js"`
-
-		// User registration
-		MinUsernameLen int `ini:"min_username_len"`
 	}
 
 	Config struct {
@@ -57,15 +61,18 @@ func New() *Config {
 			Port: 3306,
 		},
 		App: AppCfg{
+			Theme:          "write",
+			WebFonts:       true,
+			SingleUser:     true,
+			MinUsernameLen: 3,
 			Federation:     true,
 			PublicStats:    true,
-			MinUsernameLen: 3,
 		},
 	}
 }
 
 func Load() (*Config, error) {
-	cfg, err := ini.Load(configFile)
+	cfg, err := ini.Load(FileName)
 	if err != nil {
 		return nil, err
 	}
@@ -86,5 +93,5 @@ func Save(uc *Config) error {
 		return err
 	}
 
-	return cfg.SaveTo(configFile)
+	return cfg.SaveTo(FileName)
 }

config/setup.go

@@ -0,0 +1,181 @@
+package config
+
+import (
+	"fmt"
+	"github.com/fatih/color"
+	"github.com/manifoldco/promptui"
+	"github.com/mitchellh/go-wordwrap"
+	"strconv"
+)
+
+func Configure() error {
+	c, err := Load()
+	if err != nil {
+		fmt.Println("No configuration yet. Creating new.")
+		c = New()
+	} else {
+		fmt.Println("Configuration loaded.")
+	}
+	title := color.New(color.Bold, color.BgGreen).PrintlnFunc()
+
+	intro := color.New(color.Bold, color.FgWhite).PrintlnFunc()
+	fmt.Println()
+	intro("  ✍ Write Freely Configuration ✍")
+	fmt.Println()
+	fmt.Println(wordwrap.WrapString("  This quick configuration process will generate the application's config file, "+FileName+".\n\n  It validates your input along the way, so you can be sure any future errors aren't caused by a bad configuration. If you'd rather configure your server manually, instead run: writefreely --create-config and edit that file.", 75))
+	fmt.Println()
+
+	title(" Server setup ")
+	fmt.Println()
+
+	prompt := promptui.Prompt{
+		Label:    "Local port",
+		Validate: validatePort,
+		Default:  fmt.Sprintf("%d", c.Server.Port),
+	}
+	port, err := prompt.Run()
+	if err != nil {
+		return err
+	}
+	c.Server.Port, _ = strconv.Atoi(port) // Ignore error, as we've already validated number
+
+	prompt = promptui.Prompt{
+		Label:    "Public-facing host",
+		Validate: validateDomain,
+		Default:  c.Server.Host,
+	}
+	c.Server.Host, err = prompt.Run()
+	if err != nil {
+		return err
+	}
+
+	fmt.Println()
+	title(" Database setup ")
+	fmt.Println()
+
+	prompt = promptui.Prompt{
+		Label:    "Username",
+		Validate: validateNonEmpty,
+		Default:  c.Database.User,
+	}
+	c.Database.User, err = prompt.Run()
+	if err != nil {
+		return err
+	}
+
+	prompt = promptui.Prompt{
+		Label:    "Password",
+		Validate: validateNonEmpty,
+		Default:  c.Database.Password,
+		Mask:     '*',
+	}
+	c.Database.Password, err = prompt.Run()
+	if err != nil {
+		return err
+	}
+
+	prompt = promptui.Prompt{
+		Label:    "Database name",
+		Validate: validateNonEmpty,
+		Default:  c.Database.Database,
+	}
+	c.Database.Database, err = prompt.Run()
+	if err != nil {
+		return err
+	}
+
+	prompt = promptui.Prompt{
+		Label:    "Host",
+		Validate: validateNonEmpty,
+		Default:  c.Database.Host,
+	}
+	c.Database.Host, err = prompt.Run()
+	if err != nil {
+		return err
+	}
+
+	prompt = promptui.Prompt{
+		Label:    "Port",
+		Validate: validatePort,
+		Default:  fmt.Sprintf("%d", c.Database.Port),
+	}
+	dbPort, err := prompt.Run()
+	if err != nil {
+		return err
+	}
+	c.Database.Port, _ = strconv.Atoi(dbPort) // Ignore error, as we've already validated number
+
+	fmt.Println()
+	title(" App setup ")
+	fmt.Println()
+
+	selPrompt := promptui.Select{
+		Label: "Site type",
+		Items: []string{"Single user", "Multiple users"},
+	}
+	_, usersType, err := selPrompt.Run()
+	if err != nil {
+		return err
+	}
+	c.App.SingleUser = usersType == "Single user"
+
+	siteNameLabel := "Instance name"
+	if c.App.SingleUser {
+		siteNameLabel = "Blog name"
+	}
+	prompt = promptui.Prompt{
+		Label:    siteNameLabel,
+		Validate: validateNonEmpty,
+		Default:  c.App.SiteName,
+	}
+	c.App.SiteName, err = prompt.Run()
+	if err != nil {
+		return err
+	}
+
+	if !c.App.SingleUser {
+		selPrompt = promptui.Select{
+			Label: "Registration",
+			Items: []string{"Open", "Closed"},
+		}
+		_, regType, err := selPrompt.Run()
+		if err != nil {
+			return err
+		}
+		c.App.OpenRegistration = regType == "Open"
+	}
+
+	selPrompt = promptui.Select{
+		Label: "Federation",
+		Items: []string{"Enabled", "Disabled"},
+	}
+	_, fedType, err := selPrompt.Run()
+	if err != nil {
+		return err
+	}
+	c.App.Federation = fedType == "Enabled"
+
+	if c.App.Federation {
+		selPrompt = promptui.Select{
+			Label: "Federation usage stats",
+			Items: []string{"Public", "Private"},
+		}
+		_, fedStatsType, err := selPrompt.Run()
+		if err != nil {
+			return err
+		}
+		c.App.PublicStats = fedStatsType == "Public"
+
+		selPrompt = promptui.Select{
+			Label: "Instance metadata privacy",
+			Items: []string{"Public", "Private"},
+		}
+		_, fedStatsType, err = selPrompt.Run()
+		if err != nil {
+			return err
+		}
+		c.App.Private = fedStatsType == "Private"
+	}
+
+	return Save(c)
+}

config/validation.go

@@ -0,0 +1,41 @@
+package config
+
+import (
+	"fmt"
+	"regexp"
+	"strconv"
+)
+
+var (
+	domainReg = regexp.MustCompile("^https?://")
+)
+
+const (
+	minPort = 80
+	maxPort = 1<<16 - 1
+)
+
+func validateDomain(i string) error {
+	if !domainReg.MatchString(i) {
+		return fmt.Errorf("Domain must start with http:// or https://")
+	}
+	return nil
+}
+
+func validatePort(i string) error {
+	p, err := strconv.Atoi(i)
+	if err != nil {
+		return err
+	}
+	if p < minPort || p > maxPort {
+		return fmt.Errorf("Port must be a number %d - %d", minPort, maxPort)
+	}
+	return nil
+}
+
+func validateNonEmpty(i string) error {
+	if i == "" {
+		return fmt.Errorf("Must not be empty")
+	}
+	return nil
+}