WTF-484 DigitalOcean module (#782)

* WTF-484 DigitalOcean module stubbed out
* WTF-484 Delete droplets via Ctrl-d
* WTF-484 Rebasing off master after a long time away
* WTF-484 Improve DigitalOcean display
* WTF-484 Can shutdown and restart the selected droplet
* WTF-484 Display info about the selected droplet using the ? key
* WTF-484 Display info about the selected droplet using the Return key
* WTF-484 Greatly improve the utils.Truncate function
* WTF-484 Display a droplet's features in the info modal
* WTF-484 Change reboot key from r to b to not conflict with refresh
* WTF-484 Panic if a keyboard control is mapped to the same character more than once
* WTF-484 Colorize droplet status indicator
* WTF-484 Extract view.InfoTable out into a reusable component

modules/digitalocean/settings.go

@@ -0,0 +1,35 @@
+package digitalocean
+
+import (
+	"os"
+
+	"github.com/olebedev/config"
+	"github.com/wtfutil/wtf/cfg"
+	"github.com/wtfutil/wtf/wtf"
+)
+
+const (
+	defaultFocusable = true
+	defaultTitle     = "DigitalOcean"
+)
+
+// Settings defines the configuration properties for this module
+type Settings struct {
+	common *cfg.Common
+
+	apiKey     string `help:"Your DigitalOcean API key."`
+	dateFormat string `help:"The format to display dates and times in."`
+}
+
+// NewSettingsFromYAML creates a new settings instance from a YAML config block
+func NewSettingsFromYAML(name string, ymlConfig *config.Config, globalConfig *config.Config) *Settings {
+
+	settings := Settings{
+		common: cfg.NewCommonSettingsFromModule(name, defaultTitle, defaultFocusable, ymlConfig, globalConfig),
+
+		apiKey:     ymlConfig.UString("apiKey", ymlConfig.UString("apikey", os.Getenv("WTF_DIGITALOCEAN_API_KEY"))),
+		dateFormat: ymlConfig.UString("dateFormat", wtf.DateFormat),
+	}
+
+	return &settings
+}