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package github
import (
"bufio"
"bytes"
"fmt"
"io/ioutil"
"os"
"path/filepath"
"regexp"
"strings"
"github.com/github/hub/cmd"
"github.com/github/hub/git"
)
const Scissors = "------------------------ >8 ------------------------"
func NewEditor(filename, topic, message string) (editor *Editor, err error) {
gitDir, err := git.Dir()
if err != nil {
return
}
messageFile := filepath.Join(gitDir, filename)
program, err := git.Editor()
if err != nil {
return
}
cs, err := git.CommentChar(message)
if err != nil {
return
}
editor = &Editor{
Program: program,
Topic: topic,
File: messageFile,
Message: message,
CS: cs,
openEditor: openTextEditor,
}
return
}
type Editor struct {
Program string
Topic string
File string
Message string
CS string
addedFirstComment bool
openEditor func(program, file string) error
}
func (e *Editor) AddCommentedSection(text string) {
if !e.addedFirstComment {
scissors := e.CS + " " + Scissors + "\n"
scissors += e.CS + " Do not modify or remove the line above.\n"
scissors += e.CS + " Everything below it will be ignored.\n"
e.Message = e.Message + "\n" + scissors
e.addedFirstComment = true
}
e.Message = e.Message + "\n" + text
}
func (e *Editor) DeleteFile() error {
return os.Remove(e.File)
}
func (e *Editor) EditContent() (content string, err error) {
b, err := e.openAndEdit()
if err != nil {
return
}
b = bytes.TrimSpace(b)
reader := bytes.NewReader(b)
scanner := bufio.NewScanner(reader)
unquotedLines := []string{}
scissorsLine := e.CS + " " + Scissors
for scanner.Scan() {
line := scanner.Text()
if line == scissorsLine {
break
}
unquotedLines = append(unquotedLines, line)
}
if err = scanner.Err(); err != nil {
return
}
content = strings.Join(unquotedLines, "\n")
return
}
func (e *Editor) openAndEdit() (content []byte, err error) {
err = e.writeContent()
if err != nil {
return
}
err = e.openEditor(e.Program, e.File)
if err != nil {
err = fmt.Errorf("error using text editor for %s message", e.Topic)
defer e.DeleteFile()
return
}
content, err = e.readContent()
return
}
func (e *Editor) writeContent() (err error) {
if !e.isFileExist() {
err = ioutil.WriteFile(e.File, []byte(e.Message), 0644)
if err != nil {
return
}
}
return
}
func (e *Editor) isFileExist() bool {
_, err := os.Stat(e.File)
return err == nil || !os.IsNotExist(err)
}
func (e *Editor) readContent() (content []byte, err error) {
return ioutil.ReadFile(e.File)
}
func openTextEditor(program, file string) error {
editCmd := cmd.New(program)
r := regexp.MustCompile(`\b(?:[gm]?vim)(?:\.exe)?$`)
if r.MatchString(editCmd.Name) {
editCmd.WithArg("--cmd")
editCmd.WithArg("set ft=gitcommit tw=0 wrap lbr")
}
editCmd.WithArg(file)
// Reattach stdin to the console before opening the editor
setConsole(editCmd)
return editCmd.Spawn()
}
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