refactor: expose generated code and client business logic to share with Kapacitor (#103)

* refactor: take clients out of internal

* refactor: move stdio to pkg

* Move internal/api to api

* refactor: final changes for Kapacitor to access shared functionality

* chore: regenerate mocks

* fix: bad automated refactor

* chore: extra formatting not caught by make fmt

pkg/stdio/console.go

@@ -0,0 +1,91 @@
+package stdio
+
+import (
+	"errors"
+	"io"
+	"os"
+
+	"github.com/AlecAivazis/survey/v2"
+	"github.com/AlecAivazis/survey/v2/terminal"
+)
+
+// terminalStdio interacts with the user via an interactive terminal.
+type terminalStdio struct {
+	Stdin  terminal.FileReader
+	Stdout terminal.FileWriter
+	Stderr io.Writer
+}
+
+// TerminalStdio interacts with users over stdin/stdout/stderr.
+var TerminalStdio StdIO = &terminalStdio{
+	Stdin:  os.Stdin,
+	Stdout: os.Stdout,
+	Stderr: os.Stderr,
+}
+
+// Write prints some bytes to stdout.
+func (t *terminalStdio) Write(p []byte) (int, error) {
+	return t.Stdout.Write(p)
+}
+
+// WriteErr prints some bytes to stderr.
+func (t *terminalStdio) WriteErr(p []byte) (int, error) {
+	return t.Stderr.Write(p)
+}
+
+type bannerTemplateData struct {
+	Message string
+}
+
+var bannerTemplate = `{{color "cyan+hb"}}> {{ .Message }}{{color "reset"}}
+`
+
+// Banner displays informational text to the user.
+func (t *terminalStdio) Banner(message string) error {
+	r := survey.Renderer{}
+	r.WithStdio(terminal.Stdio{In: t.Stdin, Out: t.Stdout, Err: t.Stderr})
+	return r.Render(bannerTemplate, &bannerTemplateData{Message: message})
+}
+
+// Error displays an error message to the user.
+func (t *terminalStdio) Error(message string) error {
+	r := survey.Renderer{}
+	r.WithStdio(terminal.Stdio{In: t.Stdin, Out: t.Stdout, Err: t.Stderr})
+	cfg := survey.PromptConfig{Icons: survey.IconSet{Error: survey.Icon{Text: "X", Format: "red"}}}
+	return r.Error(&cfg, errors.New(message))
+}
+
+// GetStringInput prompts the user for arbitrary input.
+func (t *terminalStdio) GetStringInput(prompt, defaultValue string) (input string, err error) {
+	question := survey.Input{
+		Message: prompt,
+		Default: defaultValue,
+	}
+	err = survey.AskOne(&question, &input,
+		survey.WithStdio(t.Stdin, t.Stdout, t.Stderr),
+		survey.WithValidator(survey.Required))
+	return
+}
+
+// GetPassword prompts the user for a password.
+func (t *terminalStdio) GetPassword(prompt string, minLen int) (password string, err error) {
+	question := survey.Password{Message: prompt}
+	opts := []survey.AskOpt{survey.WithStdio(t.Stdin, t.Stdout, t.Stderr)}
+	if minLen > 0 {
+		opts = append(opts, survey.WithValidator(survey.MinLength(minLen)))
+	}
+	err = survey.AskOne(&question, &password, opts...)
+	question.NewCursor().HorizontalAbsolute(0)
+	return
+}
+
+// GetConfirm asks the user for a y/n answer to a prompt.
+func (t *terminalStdio) GetConfirm(prompt string) (answer bool) {
+	question := survey.Confirm{
+		Message: prompt,
+	}
+	if err := survey.AskOne(&question, &answer, survey.WithStdio(t.Stdin, t.Stdout, t.Stderr)); err != nil {
+		answer = false
+	}
+	return
+}