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|
/* create.go: help creating a new message
*
* Copyright (C) 2016-2018 Clemens Fries <github-lettersnail@xenoworld.de>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package cmd
import (
"bufio"
"fmt"
"github.com/docopt/docopt.go"
. "github.com/githubert/lettersnail/common"
"io/ioutil"
"os"
"os/exec"
"path/filepath"
"strings"
"time"
)
var usageCreate =
// tag::create[]
`
Usage:
lettersnail create [--draft=FILE] [options]
Options:
--help Show this help.
--to=ADDR Destination address.
--from=ADDR Sender address.
--subject=ADDR Short subject.
--cc=ADDR Set "Cc".
--bcc=ADDR Set "Bcc".
--reply-to=ADDR Set "Reply-To".
--draft=FILE Use FILE from the drafts/ folder as template.
` // end::create[]
func Create(argv []string, conf *Configuration) {
args, _ := docopt.Parse(usageCreate, argv, true, "", false)
tmpFile, err := ioutil.TempFile("", "lettersnail")
if err != nil {
fmt.Printf("Error while creating temporary file: %s\n", err.Error())
os.Exit(1)
}
// We close the file right away, because we need only its soulless
// shell, mwhaha.
tmpFile.Close()
draftsDir := filepath.Join(conf.Get(CONF_WORKDIR), DIR_DRAFTS)
todoDir := filepath.Join(conf.Get(CONF_WORKDIR), DIR_TODO)
defer os.Remove(tmpFile.Name())
message := NewMessage()
if args["--draft"] != nil {
draft := filepath.Join(draftsDir, args["--draft"].(string))
m, err := NewMessageFromFile(draft)
if err != nil {
fmt.Printf("Error while reading draft: %s\n", err.Error())
os.Exit(1)
}
message = &m
}
message.Conf.MergeWithDocOptArgs(CMD_USAGE, &args)
// MergeWithDocOptArgs will also copy --draft and --help over, but we do not want
// that.
delete(message.Conf.Data, "draft")
delete(message.Conf.Data, "help")
if message.Get("date") == "" {
// Add tomorrow's date.
message.Conf.Set("date", time.Now().AddDate(0, 0, 1).Format(DATE_FORMAT))
}
if message.Get("subject") == "" {
message.Conf.Set("subject", "Type subject here")
}
if len(message.Body) == 0 {
message.Body = append(message.Body, "Add message to the world of tomorrow here.")
}
message.WriteToFile(tmpFile.Name())
editor := editor()
fmt.Printf("Opening %s using %s.\n", tmpFile.Name(), editor)
cmd := exec.Command(editor, tmpFile.Name())
cmd.Stdin = os.Stdin
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
cmd.Run()
if cmd.ProcessState.Success() {
fmt.Printf("\nSave message? ([(y)es], (r)enamed, (d)raft, (n)o): ")
reader := bufio.NewReader(os.Stdin)
response, err := reader.ReadString('\n')
if err != nil {
fmt.Printf("Error when reading response: %s\n", err.Error())
os.Exit(1)
}
var dst string
saved := false
response = strings.TrimSpace(response)
switch response {
case "y", "yes", "":
dst = filepath.Join(todoDir, filepath.Base(tmpFile.Name())+".msg")
dst, err = copyFile(tmpFile.Name(), dst, false)
saved = true
case "r", "renamed":
fmt.Printf("\nSpecify new name: ")
reader := bufio.NewReader(os.Stdin)
response, err := reader.ReadString('\n')
if err != nil {
fmt.Printf("Error when reading response: %s\n", err.Error())
os.Exit(1)
}
dst = filepath.Join(todoDir, strings.TrimSpace(response)+".msg")
dst, err = copyFile(tmpFile.Name(), dst, false)
saved = true
case "d", "draft":
dst = filepath.Join(draftsDir, filepath.Base(tmpFile.Name())+".msg")
dst, err = copyFile(tmpFile.Name(), dst, false)
saved = true
}
if err != nil {
fmt.Printf("Error when saving %s: %s\n", dst, err)
} else if saved {
fmt.Printf("Saved as: %s\n", dst)
} else {
fmt.Println("Discarding message.")
}
}
}
// Copy file from `src` to `dst`. If `overwrite` is false, then an alternative
// file name will be used and returned as string.
// TODO: Portability issues (cp) / https://github.com/golang/go/issues/8868
func copyFile(src, dst string, overwrite bool) (string, error) {
if !overwrite {
var err error
dst, err = nextFreeFilename(dst)
if err != nil {
return "", err
}
}
err := exec.Command("cp", "-f", src, dst).Run()
return dst, err
}
func nextFreeFilename(dst string) (string, error) {
_, e := os.Stat(dst)
// If the file does not exist, we can use the name
if os.IsNotExist(e) {
return dst, nil
}
alt := ""
for i := 0; i < 255; i++ {
name := fmt.Sprintf("%s.%d", dst, i)
_, e := os.Stat(name)
if os.IsNotExist(e) {
alt = name
break
}
}
if alt == "" {
return "", fmt.Errorf("No suitable file name could be found.")
}
return alt, nil
}
func editor() string {
editor := os.Getenv("VISUAL")
if editor != "" {
return editor
}
editor = os.Getenv("EDITOR")
if editor != "" {
return editor
}
return "vi"
}
|
