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mblaze.go
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mblaze.go
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package main
import (
"bufio"
"fmt"
"os"
"os/exec"
"regexp"
"strconv"
"strings"
"time"
)
const (
Flagged MailFlag = iota
Unflagged
Seen
Unseen
Trashed
Untrashed
)
const (
// Output format used by mscan(1) (passed via the -f flag).
mscanFmt = "%0n %19D <%0f> %0S"
// Maximum amount of characters to output for the from header.
maxFrom = 17
)
var (
// POSIX extended regular expression for parsing 'mscanFmt'.
mscanRegex = regexp.MustCompilePOSIX("^([0-9]+) ([0-9]+-[0-9]+-[0-9]+ [0-9][0-9]:[0-9][0-9]:[0-9][0-9]) <([^>]+)> (.+)$")
)
type Mail struct {
ID uint
Date time.Time
From string
Subject string
}
func (m Mail) Path() (string, error) {
cmd := exec.Command("mseq", m.CmdArg())
out, err := cmd.Output()
if err != nil {
return "", err
}
str := string(out)
return strings.TrimRight(str, "\n"), nil
}
func (m Mail) Show() error {
// Use custom command-line options for less to ensure
// the pager doesn't exit if the output fits on the screen.
//
// See also: https://github.com/leahneukirchen/mblaze/blob/v1.2/mshow.c#L818-L822
pager := os.Getenv("PAGER")
if pager == "" || strings.HasPrefix(pager, "less") {
pager = "less --RAW-CONTROL-CHARS"
}
cmd := exec.Command("mshow", m.CmdArg())
cmd.Env = append(os.Environ(), "MBLAZE_PAGER="+pager)
// Make sure that we use {stdout,stdin,stderr} of the parent
// process. Need to this explicitly when using os/exec.
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
cmd.Stdin = os.Stdin
return cmd.Run()
}
func (m Mail) Reply() error {
cmd := exec.Command("mrep", m.CmdArg())
// Make sure that we use {stdout,stdin,stderr} of the parent
// process. Need to this explicitly when using os/exec.
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
cmd.Stdin = os.Stdin
return cmd.Run()
}
func (m Mail) Flag(flag MailFlag) error {
cmd := exec.Command("mflag", flag.CmdOpt(), m.CmdArg())
return cmd.Run()
}
func (m Mail) String() string {
from := m.From[0:min(len(m.From), maxFrom)]
date := adaptiveTime(m.Date)
out := fmt.Sprintf("%10s %17s %s", date, from, m.Subject)
return out
}
func (m Mail) CmdArg() string {
return strconv.FormatUint(uint64(m.ID), 10)
}
type MailFlag int
func (f MailFlag) CmdOpt() string {
switch f {
case Unflagged:
return "-f"
case Flagged:
return "-F"
case Unseen:
return "-s"
case Seen:
return "-S"
case Untrashed:
return "t"
case Trashed:
return "T"
}
panic("unreachable")
}
func mscan() ([]Mail, error) {
var mails []Mail
cmd := exec.Command("mscan", "-f", mscanFmt, "1:-1")
cmd.Env = append(os.Environ(), "MBLAZE_PAGER=")
// TODO: Somehow configure mblaze to not strip at all.
cmd.Env = append(cmd.Env, "COLUMNS=99999")
reader, err := cmd.StdoutPipe()
if err != nil {
return mails, err
}
defer reader.Close()
err = cmd.Start()
if err != nil {
return mails, err
}
scanner := bufio.NewScanner(reader)
for scanner.Scan() {
subs := mscanRegex.FindStringSubmatch(scanner.Text())
if subs == nil {
// Message might have been moved since last mseq(1).
// For example, if it was marked as seen via mflag(1).
continue
}
var id uint64
id, err = strconv.ParseUint(subs[1], 10, 32)
if err != nil {
return mails, err
}
date, err := time.Parse(time.DateTime, subs[2])
if err != nil {
return mails, err
}
from := strings.TrimSpace(subs[3])
subject := subs[4]
mails = append(mails, Mail{
ID: uint(id),
Date: date,
From: from,
Subject: subject,
})
}
err = cmd.Wait()
if err != nil {
return mails, err
}
if len(mails) == 0 {
return mails, fmt.Errorf("current sequence is empty")
}
return mails, nil
}