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256 lines (205 loc) · 6.66 KB
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// Originally taken from the git-appraise project
package input
import (
"bufio"
"bytes"
"fmt"
"io/ioutil"
"os"
"os/exec"
"strings"
"github.com/MichaelMure/git-bug/repository"
"github.com/pkg/errors"
)
const messageFilename = "BUG_MESSAGE_EDITMSG"
// ErrEmptyMessage is returned when the required message has not been entered
var ErrEmptyMessage = errors.New("empty message")
// ErrEmptyMessage is returned when the required title has not been entered
var ErrEmptyTitle = errors.New("empty title")
const bugTitleCommentTemplate = `%s%s
# Please enter the title and comment message. The first non-empty line will be
# used as the title. Lines starting with '#' will be ignored.
# An empty title aborts the operation.
`
// BugCreateEditorInput will open the default editor in the terminal with a
// template for the user to fill. The file is then processed to extract title
// and message.
func BugCreateEditorInput(repo repository.Repo, preTitle string, preMessage string) (string, string, error) {
if preMessage != "" {
preMessage = "\n\n" + preMessage
}
template := fmt.Sprintf(bugTitleCommentTemplate, preTitle, preMessage)
raw, err := launchEditorWithTemplate(repo, messageFilename, template)
if err != nil {
return "", "", err
}
lines := strings.Split(raw, "\n")
var title string
var buffer bytes.Buffer
for _, line := range lines {
if strings.HasPrefix(line, "#") {
continue
}
if title == "" {
trimmed := strings.TrimSpace(line)
if trimmed != "" {
title = trimmed
}
continue
}
buffer.WriteString(line)
buffer.WriteString("\n")
}
if title == "" {
return "", "", ErrEmptyTitle
}
message := strings.TrimSpace(buffer.String())
return title, message, nil
}
const bugCommentTemplate = `
# Please enter the comment message. Lines starting with '#' will be ignored,
# and an empty message aborts the operation.
`
// BugCommentEditorInput will open the default editor in the terminal with a
// template for the user to fill. The file is then processed to extract a comment.
func BugCommentEditorInput(repo repository.Repo) (string, error) {
raw, err := launchEditorWithTemplate(repo, messageFilename, bugCommentTemplate)
if err != nil {
return "", err
}
lines := strings.Split(raw, "\n")
var buffer bytes.Buffer
for _, line := range lines {
if strings.HasPrefix(line, "#") {
continue
}
buffer.WriteString(line)
buffer.WriteString("\n")
}
message := strings.TrimSpace(buffer.String())
if message == "" {
return "", ErrEmptyMessage
}
return message, nil
}
const bugTitleTemplate = `%s
# Please enter the new title. Only one line will used.
# Lines starting with '#' will be ignored, and an empty title aborts the operation.
`
// BugTitleEditorInput will open the default editor in the terminal with a
// template for the user to fill. The file is then processed to extract a title.
func BugTitleEditorInput(repo repository.Repo, preTitle string) (string, error) {
template := fmt.Sprintf(bugTitleTemplate, preTitle)
raw, err := launchEditorWithTemplate(repo, messageFilename, template)
if err != nil {
return "", err
}
lines := strings.Split(raw, "\n")
var title string
for _, line := range lines {
if strings.HasPrefix(line, "#") {
continue
}
trimmed := strings.TrimSpace(line)
if trimmed == "" {
continue
}
title = trimmed
break
}
if title == "" {
return "", ErrEmptyTitle
}
return title, nil
}
// launchEditorWithTemplate will launch an editor as launchEditor do, but with a
// provided template.
func launchEditorWithTemplate(repo repository.Repo, fileName string, template string) (string, error) {
path := fmt.Sprintf("%s/.git/%s", repo.GetPath(), fileName)
err := ioutil.WriteFile(path, []byte(template), 0644)
if err != nil {
return "", err
}
return launchEditor(repo, fileName)
}
// launchEditor launches the default editor configured for the given repo. This
// method blocks until the editor command has returned.
//
// The specified filename should be a temporary file and provided as a relative path
// from the repo (e.g. "FILENAME" will be converted to ".git/FILENAME"). This file
// will be deleted after the editor is closed and its contents have been read.
//
// This method returns the text that was read from the temporary file, or
// an error if any step in the process failed.
func launchEditor(repo repository.Repo, fileName string) (string, error) {
path := fmt.Sprintf("%s/.git/%s", repo.GetPath(), fileName)
defer os.Remove(path)
editor, err := repo.GetCoreEditor()
if err != nil {
return "", fmt.Errorf("Unable to detect default git editor: %v\n", err)
}
cmd, err := startInlineCommand(editor, path)
if err != nil {
// Running the editor directly did not work. This might mean that
// the editor string is not a path to an executable, but rather
// a shell command (e.g. "emacsclient --tty"). As such, we'll try
// to run the command through bash, and if that fails, try with sh
args := []string{"-c", fmt.Sprintf("%s %q", editor, path)}
cmd, err = startInlineCommand("bash", args...)
if err != nil {
cmd, err = startInlineCommand("sh", args...)
}
}
if err != nil {
return "", fmt.Errorf("Unable to start editor: %v\n", err)
}
if err := cmd.Wait(); err != nil {
return "", fmt.Errorf("Editing finished with error: %v\n", err)
}
output, err := ioutil.ReadFile(path)
if err != nil {
return "", fmt.Errorf("Error reading edited file: %v\n", err)
}
return string(output), err
}
// FromFile loads and returns the contents of a given file. If - is passed
// through, much like git, it will read from stdin. This can be piped data,
// unless there is a tty in which case the user will be prompted to enter a
// message.
func FromFile(fileName string) (string, error) {
if fileName == "-" {
stat, err := os.Stdin.Stat()
if err != nil {
return "", fmt.Errorf("Error reading from stdin: %v\n", err)
}
if (stat.Mode() & os.ModeCharDevice) == 0 {
// There is no tty. This will allow us to read piped data instead.
output, err := ioutil.ReadAll(os.Stdin)
if err != nil {
return "", fmt.Errorf("Error reading from stdin: %v\n", err)
}
return string(output), err
}
fmt.Printf("(reading comment from standard input)\n")
var output bytes.Buffer
s := bufio.NewScanner(os.Stdin)
for s.Scan() {
output.Write(s.Bytes())
output.WriteRune('\n')
}
return output.String(), nil
}
output, err := ioutil.ReadFile(fileName)
if err != nil {
return "", fmt.Errorf("Error reading file: %v\n", err)
}
return string(output), err
}
func startInlineCommand(command string, args ...string) (*exec.Cmd, error) {
cmd := exec.Command(command, args...)
cmd.Stdin = os.Stdin
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
err := cmd.Start()
return cmd, err
}