Use Survey For Interactions With User (#186)

fixes

Use Survey For Interactions With User

Add Vendor "github.com/AlecAivazis/survey/v2"

Co-authored-by: Norwin Roosen <git@nroo.de>
Co-authored-by: 6543 <6543@obermui.de>
Reviewed-on: https://gitea.com/gitea/tea/pulls/186
Reviewed-by: techknowlogick <techknowlogick@gitea.io>
Reviewed-by: Norwin <noerw@noreply.gitea.io>

vendor/github.com/AlecAivazis/survey/v2/input.go

@@ -0,0 +1,110 @@
+package survey
+
+/*
+Input is a regular text input that prints each character the user types on the screen
+and accepts the input with the enter key. Response type is a string.
+
+	name := ""
+	prompt := &survey.Input{ Message: "What is your name?" }
+	survey.AskOne(prompt, &name)
+*/
+type Input struct {
+	Renderer
+	Message string
+	Default string
+	Help    string
+}
+
+// data available to the templates when processing
+type InputTemplateData struct {
+	Input
+	Answer     string
+	ShowAnswer bool
+	ShowHelp   bool
+	Config     *PromptConfig
+}
+
+// Templates with Color formatting. See Documentation: https://github.com/mgutz/ansi#style-format
+var InputQuestionTemplate = `
+{{- if .ShowHelp }}{{- color .Config.Icons.Help.Format }}{{ .Config.Icons.Help.Text }} {{ .Help }}{{color "reset"}}{{"\n"}}{{end}}
+{{- color .Config.Icons.Question.Format }}{{ .Config.Icons.Question.Text }} {{color "reset"}}
+{{- color "default+hb"}}{{ .Message }} {{color "reset"}}
+{{- if .ShowAnswer}}
+  {{- color "cyan"}}{{.Answer}}{{color "reset"}}{{"\n"}}
+{{- else }}
+  {{- if and .Help (not .ShowHelp)}}{{color "cyan"}}[{{ print .Config.HelpInput }} for help]{{color "reset"}} {{end}}
+  {{- if .Default}}{{color "white"}}({{.Default}}) {{color "reset"}}{{end}}
+{{- end}}`
+
+func (i *Input) Prompt(config *PromptConfig) (interface{}, error) {
+	// render the template
+	err := i.Render(
+		InputQuestionTemplate,
+		InputTemplateData{
+			Input:  *i,
+			Config: config,
+		},
+	)
+	if err != nil {
+		return "", err
+	}
+
+	// start reading runes from the standard in
+	rr := i.NewRuneReader()
+	rr.SetTermMode()
+	defer rr.RestoreTermMode()
+
+	cursor := i.NewCursor()
+
+	line := []rune{}
+	// get the next line
+	for {
+		line, err = rr.ReadLine(0)
+		if err != nil {
+			return string(line), err
+		}
+		// terminal will echo the \n so we need to jump back up one row
+		cursor.PreviousLine(1)
+
+		if string(line) == config.HelpInput && i.Help != "" {
+			err = i.Render(
+				InputQuestionTemplate,
+				InputTemplateData{
+					Input:    *i,
+					ShowHelp: true,
+					Config:   config,
+				},
+			)
+			if err != nil {
+				return "", err
+			}
+			continue
+		}
+		break
+	}
+
+	// if the line is empty
+	if line == nil || len(line) == 0 {
+		// use the default value
+		return i.Default, err
+	}
+
+	lineStr := string(line)
+
+	i.AppendRenderedText(lineStr)
+
+	// we're done
+	return lineStr, err
+}
+
+func (i *Input) Cleanup(config *PromptConfig, val interface{}) error {
+	return i.Render(
+		InputQuestionTemplate,
+		InputTemplateData{
+			Input:      *i,
+			Answer:     val.(string),
+			ShowAnswer: true,
+			Config:     config,
+		},
+	)
+}