add subcommand "ximport", that is like "import" but directly access files in the datadir

so mox doesn't have to be running when you run it.
will be useful for testing in the near future.

this also moves cpuprof and memprof cli flags to top-level flag parsing, so all
commands can use them.

import.go

@@ -1,12 +1,14 @@
 package main
 
 import (
+	"bufio"
 	"context"
 	"encoding/json"
 	"errors"
 	"fmt"
 	"io"
 	"log"
+	"net"
 	"os"
 	"path/filepath"
 	"runtime/debug"
@@ -15,9 +17,11 @@ import (
 
 	"golang.org/x/exp/maps"
 
+	"github.com/mjl-/mox/config"
 	"github.com/mjl-/mox/message"
 	"github.com/mjl-/mox/metrics"
 	"github.com/mjl-/mox/mlog"
+	"github.com/mjl-/mox/mox-"
 	"github.com/mjl-/mox/store"
 )
 
@@ -89,6 +93,77 @@ func xcmdImport(mbox bool, args []string, c *cmd) {
 
 	ctl := xctl()
 	ctl.xwrite(ctlcmd)
+	xcmdImportCtl(ctl, account, mailbox, src)
+}
+
+func cmdXImportMaildir(c *cmd) {
+	c.unlisted = true
+	c.params = "accountdir mailboxname maildir"
+	c.help = `Import a maildir into an account by directly accessing the data directory.
+
+
+See "mox help import maildir" for details.
+`
+	xcmdXImport(false, c)
+}
+
+func cmdXImportMbox(c *cmd) {
+	c.unlisted = true
+	c.params = "accountdir mailboxname mbox"
+	c.help = `Import an mbox into an account by directly accessing the data directory.
+
+See "mox help import mbox" for details.
+`
+	xcmdXImport(true, c)
+}
+
+func xcmdXImport(mbox bool, c *cmd) {
+	args := c.Parse()
+	if len(args) != 3 {
+		c.Usage()
+	}
+
+	accountdir := args[0]
+	mailbox := args[1]
+	if strings.EqualFold(mailbox, "inbox") {
+		mailbox = "Inbox"
+	}
+	src := args[2]
+
+	var ctlcmd string
+	if mbox {
+		ctlcmd = "importmbox"
+	} else {
+		ctlcmd = "importmaildir"
+	}
+
+	account := filepath.Base(accountdir)
+
+	// Set up the mox config so the account can be opened.
+	if filepath.Base(filepath.Dir(accountdir)) != "accounts" {
+		log.Fatalf("accountdir must be of the form .../accounts/<name>")
+	}
+	var err error
+	mox.Conf.Static.DataDir, err = filepath.Abs(filepath.Dir(filepath.Dir(accountdir)))
+	xcheckf(err, "making absolute datadir")
+	mox.ConfigStaticPath = "fake.conf"
+	mox.Conf.DynamicLastCheck = time.Now().Add(time.Hour) // Silence errors about config file.
+	mox.Conf.Dynamic.Accounts = map[string]config.Account{
+		account: {},
+	}
+	switchDone := store.Switchboard()
+	defer close(switchDone)
+
+	xlog := mlog.New("import")
+	cconn, sconn := net.Pipe()
+	clientctl := ctl{conn: cconn, r: bufio.NewReader(cconn), log: xlog}
+	serverctl := ctl{cmd: ctlcmd, conn: sconn, r: bufio.NewReader(sconn), log: xlog}
+	go importctl(context.Background(), &serverctl, true)
+
+	xcmdImportCtl(&clientctl, account, mailbox, src)
+}
+
+func xcmdImportCtl(ctl *ctl, account, mailbox, src string) {
 	ctl.xwrite(account)
 	ctl.xwrite(mailbox)
 	ctl.xwrite(src)