Allow editing multiline prompts with external text editor (#429)

- Adds a new `Preferences` struct to the config, initially only containing `Editor: bool (default false)`.
  This struct will be serialized to configs once there is a first tea induced change to the config (eg `tea login default <name>` or `tea login add`).
- Use external editor for all multiline prompts if preferred.

We already had a function for starting a texteditor for diff reviews; it does not really make sense to replace it with `survey.Editor`, as there is a big interface mismatch: survey expects strings as inputs, while our diff functions operate on files,

fixes #424

Co-authored-by: Norwin <git@nroo.de>
Reviewed-on: https://gitea.com/gitea/tea/pulls/429
Reviewed-by: Andrew Thornton <art27@cantab.net>
Reviewed-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: Norwin <noerw@noreply.gitea.io>
Co-committed-by: Norwin <noerw@noreply.gitea.io>

cmd/comment.go

@@ -9,13 +9,15 @@ import (
 	"io/ioutil"
 	"strings"
 
-	"code.gitea.io/tea/modules/interact"
-
-	"code.gitea.io/sdk/gitea"
 	"code.gitea.io/tea/cmd/flags"
+	"code.gitea.io/tea/modules/config"
 	"code.gitea.io/tea/modules/context"
+	"code.gitea.io/tea/modules/interact"
 	"code.gitea.io/tea/modules/print"
 	"code.gitea.io/tea/modules/utils"
+
+	"code.gitea.io/sdk/gitea"
+	"github.com/AlecAivazis/survey/v2"
 	"github.com/urfave/cli/v2"
 )
 
@@ -54,7 +56,11 @@ func runAddComment(cmd *cli.Context) error {
 			body = strings.Join([]string{body, string(bodyStdin)}, "\n\n")
 		}
 	} else if len(body) == 0 {
-		if body, err = interact.PromptMultiline("Content"); err != nil {
+		if err = survey.AskOne(interact.NewMultiline(interact.Multiline{
+			Message:   "Comment:",
+			Syntax:    "md",
+			UseEditor: config.GetPreferences().Editor,
+		}), &body); err != nil {
 			return err
 		}
 	}

modules/config/config.go

@@ -17,9 +17,16 @@ import (
 	"gopkg.in/yaml.v2"
 )
 
+// Preferences that are stored in and read from the config file
+type Preferences struct {
+	// Prefer using an external text editor over inline multiline prompts
+	Editor bool `yaml:"editor"`
+}
+
 // LocalConfig represents local configurations
 type LocalConfig struct {
 	Logins []Login     `yaml:"logins"`
+	Prefs  Preferences `yaml:"preferences"`
 }
 
 var (
@@ -55,6 +62,11 @@ func GetConfigPath() string {
 	return configFilePath
 }
 
+// GetPreferences returns preferences based on the config file
+func GetPreferences() Preferences {
+	return config.Prefs
+}
+
 // loadConfig load config from file
 func loadConfig() (err error) {
 	loadConfigOnce.Do(func() {

modules/interact/comments.go

@@ -11,6 +11,7 @@ import (
 	"code.gitea.io/sdk/gitea"
 	"code.gitea.io/tea/modules/context"
 	"code.gitea.io/tea/modules/print"
+
 	"github.com/AlecAivazis/survey/v2"
 	"golang.org/x/crypto/ssh/terminal"
 )

modules/interact/issue_create.go

@@ -43,7 +43,12 @@ func promptIssueProperties(login *config.Login, owner, repo string, o *gitea.Cre
 	}
 
 	// description
-	promptD := &survey.Multiline{Message: "Issue description:", Default: o.Body}
+	promptD := NewMultiline(Multiline{
+		Message:   "Issue description:",
+		Default:   o.Body,
+		Syntax:    "md",
+		UseEditor: config.GetPreferences().Editor,
+	})
 	if err = survey.AskOne(promptD, &o.Body); err != nil {
 		return err
 	}

modules/interact/milestone_create.go

@@ -33,7 +33,11 @@ func CreateMilestone(login *config.Login, owner, repo string) error {
 	}
 
 	// description
-	promptM := &survey.Multiline{Message: "Milestone description:"}
+	promptM := NewMultiline(Multiline{
+		Message:   "Milestone description:",
+		Syntax:    "md",
+		UseEditor: config.GetPreferences().Editor,
+	})
 	if err := survey.AskOne(promptM, &description); err != nil {
 		return err
 	}

modules/interact/prompts.go

@@ -14,9 +14,26 @@ import (
 	"github.com/araddon/dateparse"
 )
 
-// PromptMultiline runs a textfield-style prompt and blocks until input was made.
-func PromptMultiline(message string) (content string, err error) {
-	err = survey.AskOne(&survey.Multiline{Message: message}, &content)
+// Multiline represents options for a prompt that expects multiline input
+type Multiline struct {
+	Message   string
+	Default   string
+	Syntax    string
+	UseEditor bool
+}
+
+// NewMultiline creates a prompt that switches between the inline multiline text
+// and a texteditor based prompt
+func NewMultiline(opts Multiline) (prompt survey.Prompt) {
+	if opts.UseEditor {
+		prompt = &survey.Editor{
+			Message:  opts.Message,
+			Default:  opts.Default,
+			FileName: "*." + opts.Syntax,
+		}
+	} else {
+		prompt = &survey.Multiline{Message: opts.Message, Default: opts.Default}
+	}
 	return
 }
 

modules/interact/pull_review.go

@@ -8,6 +8,7 @@ import (
 	"fmt"
 	"os"
 
+	"code.gitea.io/tea/modules/config"
 	"code.gitea.io/tea/modules/context"
 	"code.gitea.io/tea/modules/task"
 
@@ -55,7 +56,11 @@ func ReviewPull(ctx *context.TeaContext, idx int64) error {
 	if (state == gitea.ReviewStateComment && len(codeComments) == 0) || state == gitea.ReviewStateRequestChanges {
 		promptOpts = survey.WithValidator(survey.Required)
 	}
-	err = survey.AskOne(&survey.Multiline{Message: "Concluding comment:"}, &comment, promptOpts)
+	err = survey.AskOne(NewMultiline(Multiline{
+		Message:   "Concluding comment:",
+		Syntax:    "md",
+		UseEditor: config.GetPreferences().Editor,
+	}), &comment, promptOpts)
 	if err != nil {
 		return err
 	}
@@ -65,6 +70,7 @@ func ReviewPull(ctx *context.TeaContext, idx int64) error {
 
 // DoDiffReview (1) fetches & saves diff in tempfile, (2) starts $VISUAL or $EDITOR to comment on diff,
 // (3) parses resulting file into code comments.
+// It doesn't really make sense to use survey.Editor() here, as we'd read the file content at least twice.
 func DoDiffReview(ctx *context.TeaContext, idx int64) ([]gitea.CreatePullReviewComment, error) {
 	tmpFile, err := task.SavePullDiff(ctx, idx)
 	if err != nil {