[nmh] / uip / whatnowsbr.c

/* whatnowsbr.c -- the WhatNow shell
 *
 * This code is Copyright (c) 2002, by the authors of nmh.  See the
 * COPYRIGHT file in the root directory of the nmh distribution for
 * complete copyright information.
 *
 *  Several options have been added to ease the inclusion of attachments
 *  using the header field name mechanism added to anno and send.  The
 *  -attach option is used to specify the header field name for attachments.
 *
 *  Several commands have been added at the whatnow prompt:
 *
 *      cd [ directory ]        This option works just like the shell's
 *                              cd command and lets the user change the
 *                              directory from which attachments are
 *                              taken so that long path names are not
 *                              needed with every file.
 *
 *      ls [ ls-options ]       This option works just like the normal
 *                              ls command and exists to allow the user
 *                              to verify file names in the directory.
 *
 *      pwd                     This option works just like the normal
 *                              pwd command and exists to allow the user
 *                              to verify the directory.
 *
 *      attach [-v] files       This option attaches the named files to
 *                              the draft.  -v displays the mhbuild
 *                              directive that send(1) will use.
 *
 *      alist [-ln]             This option lists the attachments on the
 *                              draft.  -l gets long listings, -n gets
 *                              numbered listings.
 *
 *      detach files            This option removes attachments from the
 *      detach -n numbers       draft.  This can be done by file name or
 *                              by attachment number.
 */

#include "h/mh.h"
#include "whatnowsbr.h"
#include "sendsbr.h"
#include "annosbr.h"
#include "sbr/m_getfld.h"
#include "sbr/getarguments.h"
#ifdef READLINE_SUPPORT
#include "sbr/read_switch_multiword_via_readline.h"
#else /* ! READLINE_SUPPORT */
#include "sbr/read_switch_multiword.h"
#endif /* READLINE_SUPPORT */
#include "sbr/concat.h"
#include "sbr/showfile.h"
#include "sbr/smatch.h"
#include "sbr/r1bindex.h"
#include "sbr/refile.h"
#include "sbr/copyip.h"
#include "sbr/getcpy.h"
#include "sbr/m_draft.h"
#include "sbr/m_backup.h"
#include "sbr/geteditor.h"
#include "sbr/context_save.h"
#include "sbr/context_find.h"
#include "sbr/brkstring.h"
#include "sbr/ambigsw.h"
#include "sbr/push.h"
#include "sbr/path.h"
#include "sbr/print_version.h"
#include "sbr/print_help.h"
#include "sbr/arglist.h"
#include "sbr/error.h"
#include <fcntl.h>
#include "h/mime.h"
#include "h/utils.h"
#ifdef OAUTH_SUPPORT
#include "h/oauth.h"
#endif
#include "h/done.h"
#include "sbr/m_maildir.h"
#include "sbr/m_mktemp.h"
#include "sbr/mime_type.h"

#define WHATNOW_SWITCHES \
    X("draftfolder +folder", 0, DFOLDSW) \
    X("draftmessage msg", 0, DMSGSW) \
    X("nodraftfolder", 0, NDFLDSW) \
    X("editor editor", 0, EDITRSW) \
    X("noedit", 0, NEDITSW) \
    X("prompt string", 4, PRMPTSW) \
    X("version", 0, VERSIONSW) \
    X("help", 0, HELPSW) \


#define X(sw, minchars, id) id,
DEFINE_SWITCH_ENUM(WHATNOW);
#undef X

#define X(sw, minchars, id) { sw, minchars, id },
DEFINE_SWITCH_ARRAY(WHATNOW, whatnowswitches);
#undef X

/*
 * Options at the "whatnow" prompt
 */
#define PROMPT_SWITCHES \
    X("edit [<editor> <switches>]", 0, EDITSW) \
    X("refile [<switches>] +folder", 0, REFILEOPT) \
    X("mime [<switches>]", 0, BUILDMIMESW) \
    X("display [<switches>]", 0, DISPSW) \
    X("list [<switches>]", 0, LISTSW) \
    X("send [<switches>]", 0, SENDSW) \
    X("push [<switches>]", 0, PUSHSW) \
    X("whom [<switches>]", 0, WHOMSW) \
    X("quit [-delete]", 0, QUITSW) \
    X("delete", 0, DELETESW) \
    X("cd [directory]", 0, CDCMDSW) \
    X("pwd", 0, PWDCMDSW) \
    X("ls", 2, LSCMDSW) \
    X("attach [-v]", 0, ATTACHCMDSW) \
    X("detach [-n]", 0, DETACHCMDSW) \
    X("alist [-ln] ", 2, ALISTCMDSW) \

#define X(sw, minchars, id) id,
DEFINE_SWITCH_ENUM(PROMPT);
#undef X

#define X(sw, minchars, id) { sw, minchars, id },
DEFINE_SWITCH_ARRAY(PROMPT, aleqs);
#undef X

static char *myprompt = "\nWhat now? ";

/*
 * static prototypes
 */
static int editfile (char **, char **, char *, int, struct msgs *,
        char *, char *, int, int);
static int sendfile (char **, char *, int);
static void sendit (char *, char **, char *, int);
static int buildfile (char **, char *);
static int whomfile (char **, char *);
static int removefile (char *);
static int checkmimeheader (char *);
static void writelscmd(char *, int, char *, char **);
static void writesomecmd(char *buf, int bufsz, char *cmd, char *trailcmd, char **argp);
static FILE* popen_in_dir(const char *dir, const char *cmd, const char *type);
static int system_in_dir(const char *dir, const char *cmd);
static int copyf (char *, char *);


int
WhatNow (int argc, char **argv)
{
    int isdf = 0;
    bool nedit = false;
    int use = 0, atfile = 1;
    char *cp, *dfolder = NULL, *dmsg = NULL;
    char *ed = NULL, *drft = NULL, *msgnam = NULL;
    char buf[BUFSIZ];
    char **argp, **arguments;
    struct stat st;
    char        cwd[PATH_MAX + 1];      /* current working directory */
    char        shell[PATH_MAX + 1];    /* shell response buffer */
    FILE        *f;                     /* read pointer for bgnd proc */
    char        *l;                     /* set on -l to alist  command */
    int         n;                      /* set on -n to alist command */

    /* Need this if called from what_now(). */
    invo_name = r1bindex (argv[0], '/');

    arguments = getarguments (invo_name, argc, argv, 1);
    argp = arguments;

    /*
     *  Get the initial current working directory.
     */

    if (getcwd(cwd, sizeof (cwd)) == NULL) {
        adios("getcwd", "could not get working directory");
    }

    while ((cp = *argp++)) {
        if (*cp == '-') {
            switch (smatch (++cp, whatnowswitches)) {
            case AMBIGSW:
                ambigsw (cp, whatnowswitches);
                done (1);
            case UNKWNSW:
                die("-%s unknown", cp);

            case HELPSW:
                snprintf (buf, sizeof(buf), "%s [switches] [file]", invo_name);
                print_help (buf, whatnowswitches, 1);
                done (0);
            case VERSIONSW:
                print_version(invo_name);
                done (0);

            case DFOLDSW:
                if (dfolder)
                    die("only one draft folder at a time!");
                if (!(cp = *argp++) || *cp == '-')
                    die("missing argument to %s", argp[-2]);
                dfolder = path (*cp == '+' || *cp == '@' ? cp + 1 : cp,
                                *cp != '@' ? TFOLDER : TSUBCWF);
                continue;
            case DMSGSW:
                if (dmsg)
                    die("only one draft message at a time!");
                if (!(dmsg = *argp++) || *dmsg == '-')
                    die("missing argument to %s", argp[-2]);
                continue;
            case NDFLDSW:
                dfolder = NULL;
                isdf = NOTOK;
                continue;

            case EDITRSW:
                if (!(ed = *argp++) || *ed == '-')
                    die("missing argument to %s", argp[-2]);
                nedit = false;
                continue;
            case NEDITSW:
                nedit = true;
                continue;

            case PRMPTSW:
                if (!(myprompt = *argp++) || *myprompt == '-')
                    die("missing argument to %s", argp[-2]);
                continue;
            }
        }
        if (drft)
            die("only one draft at a time!");
        drft = cp;
    }

    if ((drft == NULL && (drft = getenv ("mhdraft")) == NULL) || *drft == 0)
        drft = mh_xstrdup(m_draft(dfolder, dmsg, 1, &isdf));

    msgnam = (cp = getenv ("mhaltmsg")) && *cp ? mh_xstrdup(cp) : NULL;

    if ((cp = getenv ("mhatfile")) && *cp)
        atfile = atoi(cp);

    if ((cp = getenv ("mhuse")) && *cp)
        use = atoi (cp);

    if (ed == NULL && ((ed = getenv ("mheditor")) == NULL || *ed == 0)) {
        ed = NULL;
        nedit = true;
    }

    /* start editing the draft, unless -noedit was given */
    if (!nedit && editfile (&ed, NULL, drft, use, NULL, msgnam,
                            NULL, 1, atfile) < 0)
        done (1);

    for (;;) {
#ifdef READLINE_SUPPORT
        if (!(argp = read_switch_multiword_via_readline(myprompt, aleqs))) {
#else /* ! READLINE_SUPPORT */
        if (!(argp = read_switch_multiword(myprompt, aleqs))) {
#endif /* READLINE_SUPPORT */
            (void) m_unlink (LINK);
            done (1);
        }
        switch (smatch (*argp, aleqs)) {
        case DISPSW:
            /* display the message being replied to, or distributed */
            if (msgnam)
                showfile (++argp, msgnam);
            else
                inform("no alternate message to display");
            break;

        case BUILDMIMESW:
            /* Translate MIME composition file */
            buildfile (++argp, drft);
            break;

        case EDITSW:
            /* Call an editor on the draft file */
            if (*++argp)
                ed = *argp++;
            if (editfile (&ed, argp, drft, NOUSE, NULL, msgnam,
                          NULL, 1, atfile) == NOTOK)
                done (1);
            break;

        case LISTSW:
            /* display the draft file */
            showfile (++argp, drft);
            break;

        case WHOMSW:
            /* Check to whom the draft would be sent */
            whomfile (++argp, drft);
            break;

        case QUITSW:
            /* Quit, and possibly delete the draft */
            if (*++argp && (*argp[0] == 'd' ||
                ((*argp)[0] == '-' && (*argp)[1] == 'd'))) {
                removefile (drft);
            } else {
                if (stat (drft, &st) != NOTOK)
                    inform("draft left on %s", drft);
            }
            done (1);

        case DELETESW:
            /* Delete draft and exit */
            removefile (drft);
            done (1);

        case PUSHSW:
            /* Send draft in background */
            if (sendfile (++argp, drft, 1))
                done (1);
            break;

        case SENDSW:
            /* Send draft */
            sendfile (++argp, drft, 0);
            break;

        case REFILEOPT:
            /* Refile the draft */
            if (refile (++argp, drft) == 0)
                done (0);
            break;

        case CDCMDSW:
            /* Change the working directory for attachments
             *
             *  Run the directory through the user's shell so that
             *  we can take advantage of any syntax that the user
             *  is accustomed to.  Read back the absolute path.
             */

            if (*(argp+1) == NULL) {
                strcpy(buf, "$SHELL -c \"cd&&pwd\"");
            }
            else {
                writesomecmd(buf, BUFSIZ, "cd", "pwd", argp);
            }
            if ((f = popen_in_dir(cwd, buf, "r")) != NULL) {
                if (fgets(cwd, sizeof (cwd), f) == NULL) {
                    advise (buf, "fgets");
                }
                trim_suffix_c(cwd, '\n');
                pclose(f);
            }
            else {
                advise("popen", "could not get directory");
            }

            break;

        case PWDCMDSW:
            /* Print the working directory for attachments */
            puts(cwd);
            break;

        case LSCMDSW:
            /* List files in the current attachment working directory
             *
             *  Use the user's shell so that we can take advantage of any
             *  syntax that the user is accustomed to.
             */
            writelscmd(buf, sizeof(buf), "", argp);
            (void)system_in_dir(cwd, buf);
            break;

        case ALISTCMDSW:
            /*
             *  List attachments on current draft.  Options are:
             *
             *   -l     long listing (full path names)
             *   -n     numbers listing
             */

            if (checkmimeheader(drft))
                break;

            l = NULL;
            n = 0;

            while (*++argp != NULL) {
                if (strcmp(*argp, "-l") == 0)
                    l = "/";

                else if (strcmp(*argp, "-n") == 0)
                    n = 1;

                else if (strcmp(*argp, "-ln") == 0 || strcmp(*argp, "-nl") == 0) {
                    l = "/";
                    n = 1;
                }

                else {
                    n = -1;
                    break;
                }
            }

            if (n == -1)
                inform("usage is alist [-ln].");

            else
                annolist(drft, ATTACH_FIELD, l, n);

            break;

        case ATTACHCMDSW: {
            /*
             *  Attach files to current draft.
             */

            bool verbose = false;
            char **ap;

            if (checkmimeheader(drft))
                break;

            for (ap = argp+1; *ap; ++ap) {
                if (strcmp(*ap, "-v") == 0) {
                    ++argp;
                    verbose = true;
                } else if (*ap[0] != '-') {
                    break;
                }
            }

            if (*(argp+1) == NULL) {
                inform("attach command requires file argument(s).");
                break;
            }

            /*
             *  Build a command line that causes the user's shell to list the file name
             *  arguments.  This handles and wildcard expansion, tilde expansion, etc.
             */
            writelscmd(buf, sizeof(buf), "-d --", argp);

            /*
             *  Read back the response from the shell, which contains a number of lines
             *  with one file name per line.  Remove off the newline.  Determine whether
             *  we have an absolute or relative path name.  Prepend the current working
             *  directory to relative path names.  Add the attachment annotation to the
             *  draft.
             */

            if ((f = popen_in_dir(cwd, buf, "r")) != NULL) {
                char file[2 * PATH_MAX + 2]; /* file name buffer */

                while (fgets(shell, sizeof (shell), f) != NULL) {
                    char *ctype;

                    trim_suffix_c(shell, '\n');

                    if (*shell == '/') {
                        strncpy(file, shell, sizeof(file));
                        file[sizeof(file) - 1] = '\0';
                    } else {
                        snprintf(file, sizeof(file), "%s/%s", cwd, shell);
                    }

                    annotate(drft, ATTACH_FIELD, file, 1, 0, -2, 1);
                    if (verbose) {
                        ctype = mime_type(file);
                        printf ("Attaching %s as a %s\n", file, ctype);
                        free (ctype);
                    }
                }

                pclose(f);
            }
            else {
                advise("popen", "could not get file from shell");
            }

            break;
        }
        case DETACHCMDSW:
            /*
             *  Detach files from current draft.
             */

            /*
             *  Scan the arguments for a -n.  Mixed file names and numbers aren't allowed,
             *  so this catches a -n anywhere in the argument list.
             */

            if (checkmimeheader(drft))
                break;

            for (n = 0, arguments = argp + 1; *arguments != NULL; arguments++) {
                if (strcmp(*arguments, "-n") == 0) {
                        n = 1;
                        break;
                }
            }

            /*
             *  A -n was found so interpret the arguments as attachment numbers.
             *  Decrement any remaining argument number that is greater than the one
             *  just processed after processing each one so that the numbering stays
             *  correct.
             */

            if (n == 1) {
                for (arguments = argp + 1; *arguments != NULL; arguments++) {
                    if (strcmp(*arguments, "-n") == 0)
                        continue;

                    if (**arguments != '\0') {
                        n = atoi(*arguments);
                        annotate(drft, ATTACH_FIELD, NULL, 1, 0, n, 1);

                        for (argp = arguments + 1; *argp != NULL; argp++) {
                            if (atoi(*argp) > n) {
                                if (atoi(*argp) == 1)
                                    *argp = "";
                                else
                                    (void)sprintf(*argp, "%d", atoi(*argp) - 1);
                            }
                        }
                    }
                }
            }

            /*
             *  The arguments are interpreted as file names.  Run them through the
             *  user's shell for wildcard expansion and other goodies.  Do this from
             *  the current working directory if the argument is not an absolute path
             *  name (does not begin with a /).
             *
             * We feed all the file names to the shell at once, otherwise you can't
             * provide a file name with a space in it.
             */
            writelscmd(buf, sizeof(buf), "-d --", argp);
            if ((f = popen_in_dir(cwd, buf, "r")) != NULL) {
                while (fgets(shell, sizeof (shell), f) != NULL) {
                    trim_suffix_c(shell, '\n');
                    annotate(drft, ATTACH_FIELD, shell, 1, 0, 0, 1);
                }
                pclose(f);
            } else {
                advise("popen", "could not get file from shell");
            }

            break;

        default:
            /* Unknown command */
            inform("say what?");
            break;
        }
    }
    /*NOTREACHED*/
}



/* Build a command line of the form $SHELL -c "cd 'cwd'; cmd argp ... ; trailcmd". */
static void
writesomecmd(char *buf, int bufsz, char *cmd, char *trailcmd, char **argp)
{
    char *cp;
    /* Note that we do not quote -- the argp from the user
     * is assumed to be quoted as they desire. (We can't treat
     * it as pure literal as that would prevent them using ~,
     * wildcards, etc.) The buffer produced by this function
     * should be given to popen_in_dir() or system_in_dir() so
     * that the current working directory is set correctly.
     */
    int ln = snprintf(buf, bufsz, "$SHELL -c \"%s", cmd);
    /* NB that some snprintf() return -1 on overflow rather than the
     * new C99 mandated 'number of chars that would have been written'
     */
    /* length checks here and inside the loop allow for the
     * trailing "&&", trailcmd, '"' and NUL
     */
    int trailln = strlen(trailcmd) + 4;
    if (ln < 0 || ln + trailln > bufsz)
        die("arguments too long");

    cp = buf + ln;

    while (*argp  &&  *++argp) {
        ln = strlen(*argp);
        /* +1 for leading space */
        if (ln + trailln + 1 > bufsz - (cp-buf))
            die("arguments too long");
        *cp++ = ' ';
        memcpy(cp, *argp, ln+1);
        cp += ln;
    }
    if (*trailcmd) {
        *cp++ = '&'; *cp++ = '&';
        strcpy(cp, trailcmd);
        cp += trailln - 4;
    }
    *cp++ = '"';
    *cp = 0;
}

/*
 * Build a command line that causes the user's shell to list the file name
 * arguments.  This handles and wildcard expansion, tilde expansion, etc.
 */
static void
writelscmd(char *buf, int bufsz, char *lsoptions, char **argp)
{
  char *lscmd = concat ("ls ", lsoptions, NULL);
  writesomecmd(buf, bufsz, lscmd, "", argp);
  free (lscmd);
}

/* Like system(), but run the command in directory dir.
 * This assumes the program is single-threaded!
 */
static int
system_in_dir(const char *dir, const char *cmd)
{
    char olddir[BUFSIZ];
    int r;

    /* ensure that $SHELL exists, as the cmd was written relying on
       a non-blank $SHELL... */
    setenv("SHELL","/bin/sh",0); /* don't overwrite */

    if (getcwd(olddir, sizeof(olddir)) == 0)
        adios("getcwd", "could not get working directory");
    if (chdir(dir) != 0)
        adios("chdir", "could not change working directory");
    r = system(cmd);
    if (chdir(olddir) != 0)
        adios("chdir", "could not change working directory");
    return r;
}

/* ditto for popen() */
static FILE*
popen_in_dir(const char *dir, const char *cmd, const char *type)
{
    char olddir[BUFSIZ];
    FILE *f;

    /* ensure that $SHELL exists, as the cmd was written relying on
       a non-blank $SHELL... */
    setenv("SHELL","/bin/sh",0); /* don't overwrite */

    if (getcwd(olddir, sizeof(olddir)) == 0)
        adios("getcwd", "could not get working directory");
    if (chdir(dir) != 0)
        adios("chdir", "could not change working directory");
    f = popen(cmd, type);
    if (chdir(olddir) != 0)
        adios("chdir", "could not change working directory");
    return f;
}


/*
 * EDIT
 */

static bool reedit;             /* have we been here before?     */
static char *edsave = NULL;     /* the editor we used previously */


static int
editfile (char **ed, char **arg, char *file, int use, struct msgs *mp,
          char *altmsg, char *cwd, int save_editor, int atfile)
{
    int pid, status, vecp;
    char altpath[BUFSIZ], linkpath[BUFSIZ];
    char *cp, *prog, **vec;
    struct stat st;

    bool slinked = false;

    /* Was there a previous edit session? */
    if (reedit && (*ed || edsave)) {
        if (!*ed) {             /* no explicit editor      */
            *ed = edsave;       /* so use the previous one */
            if ((cp = r1bindex (*ed, '/')) == NULL)
                cp = *ed;

            /* unless we've specified it via "editor-next" */
            cp = concat (cp, "-next", NULL);
            if ((cp = context_find (cp)) != NULL)
                *ed = cp;
        }
    } else {
        /* set initial editor */
        if (*ed == NULL)
            *ed = get_default_editor();
    }

    if (altmsg) {
        if (mp == NULL || *altmsg == '/' || cwd == NULL)
            strncpy (altpath, altmsg, sizeof(altpath) - 1);
        else
            snprintf (altpath, sizeof(altpath), "%s/%s", mp->foldpath, altmsg);
        if (cwd == NULL)
            strncpy (linkpath, LINK, sizeof(linkpath));
        else
            snprintf (linkpath, sizeof(linkpath), "%s/%s", cwd, LINK);

        if (atfile) {
            (void) m_unlink (linkpath);
            if (link (altpath, linkpath) == NOTOK) {
                if (symlink (altpath, linkpath) < 0) {
                    adios (linkpath, "symlink");
                }
                slinked = true;
            } else {
                slinked = false;
            }
        }
    }

    context_save ();    /* save the context file */
    fflush (stdout);

    switch (pid = fork()) {
        case NOTOK:
            advise ("fork", "unable to");
            status = NOTOK;
            break;

        case OK:
            if (cwd) {
                if (chdir (cwd) < 0) {
                    advise (cwd, "chdir");
                }
            }
            if (altmsg) {
                if (mp)
                    setenv("mhfolder", mp->foldpath, 1);
                setenv("editalt", altpath, 1);
            }

            vec = argsplit(*ed, &prog, &vecp);

            if (arg)
                while (*arg)
                    vec[vecp++] = *arg++;
            vec[vecp++] = file;
            vec[vecp] = NULL;

            execvp (prog, vec);
            fprintf (stderr, "unable to exec ");
            perror (*ed);
            _exit(1);

        default:
            if ((status = pidwait (pid, NOTOK))) {
                if (((status & 0xff00) != 0xff00)
                    && (!reedit || (status & 0x00ff))) {
                    if (!use && (status & 0xff00) &&
                            (rename (file, cp = m_backup (file)) != NOTOK)) {
                        inform("problems with edit--draft left in %s", cp);
                    } else {
                        inform("problems with edit--%s preserved", file);
                    }
                }
                status = -2;    /* maybe "reedit ? -2 : -1"? */
                break;
            }

            reedit = true;
            if (altmsg
                    && mp
                    && !is_readonly(mp)
                    && (slinked
                           ? lstat (linkpath, &st) != NOTOK
                                && S_ISREG(st.st_mode)
                                && copyf (linkpath, altpath) == NOTOK
                           : stat (linkpath, &st) != NOTOK
                                && st.st_nlink == 1
                                && (m_unlink (altpath) == NOTOK
                                        || link (linkpath, altpath) == NOTOK)))
                advise (linkpath, "unable to update %s from", altmsg);
    }

    /* normally, we remember which editor we used */
    if (save_editor)
        edsave = getcpy (*ed);

    *ed = NULL;
    if (altmsg && atfile)
        (void) m_unlink (linkpath);

    return status;
}


static int
copyf (char *ifile, char *ofile)
{
    int i, in, out;
    char buffer[BUFSIZ];

    if ((in = open (ifile, O_RDONLY)) == NOTOK)
        return NOTOK;
    if ((out = open (ofile, O_WRONLY | O_TRUNC)) == NOTOK) {
        admonish (ofile, "unable to open and truncate");
        close (in);
        return NOTOK;
    }

    while ((i = read (in, buffer, sizeof(buffer))) > OK)
        if (write (out, buffer, i) != i) {
            advise (ofile, "may have damaged");
            i = NOTOK;
            break;
        }

    close (in);
    close (out);
    return i;
}


/*
 * SEND
 */

static int
sendfile (char **arg, char *file, int pushsw)
{
    pid_t child_id;
    int vecp;
    char *cp, *sp, **vec, *program;

    /*
     * If the sendproc is the nmh command `send', then we call
     * those routines directly rather than exec'ing the command.
     */
    if (strcmp (sp = r1bindex (sendproc, '/'), "send") == 0) {
        cp = invo_name;
        sendit (invo_name = sp, arg, file, pushsw);
        invo_name = cp;
        return 1;
    }

    context_save ();    /* save the context file */
    fflush (stdout);

    child_id = fork();
    switch (child_id) {
        case NOTOK:
            adios("fork", "failed:");

        case OK:
            vec = argsplit(sendproc, &program, &vecp);
            if (pushsw)
                vec[vecp++] = "-push";
            if (arg)
                while (*arg)
                    vec[vecp++] = *arg++;
            vec[vecp++] = file;
            vec[vecp] = NULL;

            execvp (program, vec);
            fprintf (stderr, "unable to exec ");
            perror (sendproc);
            _exit(1);

        default:
            if (pidwait(child_id, OK) == 0)
                done (0);
            return 1;
    }
}


/*
 * Translate MIME composition file (call buildmimeproc)
 */

static int
buildfile (char **argp, char *file)
{
    int i;
    char **args, *ed;

    ed = buildmimeproc;

    /* allocate space for arguments */
    i = 0;
    if (argp) {
        while (argp[i])
            i++;
    }
    args = mh_xmalloc((i + 2) * sizeof(char *));

    /*
     * For backward compatibility, we need to add -build
     * if we are using mhn as buildmimeproc
     */
    i = 0;
    if (strcmp (r1bindex (ed, '/'), "mhn") == 0)
        args[i++] = "-build";

    /* copy any other arguments */
    while (argp && *argp)
        args[i++] = *argp++;
    args[i] = NULL;

    i = editfile (&ed, args, file, NOUSE, NULL, NULL, NULL, 0, 0);
    free (args);

    return i ? NOTOK : OK;
}


#ifndef CYRUS_SASL
# define SASLminc(a) (a)
#else /* CYRUS_SASL */
# define SASLminc(a)  0
#endif /* CYRUS_SASL */

#ifndef TLS_SUPPORT
# define TLSminc(a)  (a)
#else /* TLS_SUPPORT */
# define TLSminc(a)   0
#endif /* TLS_SUPPORT */

#define SEND_SWITCHES \
    X("alias aliasfile", 0, ALIASW) \
    X("debug", -5, DEBUGSW) \
    X("filter filterfile", 0, FILTSW) \
    X("nofilter", 0, NFILTSW) \
    X("format", 0, FRMTSW) \
    X("noformat", 0, NFRMTSW) \
    X("forward", 0, FORWSW) \
    X("noforward", 0, NFORWSW) \
    X("mime", 0, MIMESW) \
    X("nomime", 0, NMIMESW) \
    X("msgid", 0, MSGDSW) \
    X("nomsgid", 0, NMSGDSW) \
    X("push", 0, SPSHSW) \
    X("nopush", 0, NSPSHSW) \
    X("split seconds", 0, SPLITSW) \
    X("unique", -6, UNIQSW) \
    X("nounique", -8, NUNIQSW) \
    X("verbose", 0, VERBSW) \
    X("noverbose", 0, NVERBSW) \
    X("watch", 0, WATCSW) \
    X("nowatch", 0, NWATCSW) \
    X("width columns", 0, WIDTHSW) \
    X("version", 0, SVERSIONSW) \
    X("help", 0, SHELPSW) \
    X("dashstuffing", -12, BITSTUFFSW) \
    X("nodashstuffing", -14, NBITSTUFFSW) \
    X("client host", -6, CLIESW) \
    X("server host", 6, SERVSW) \
    X("snoop", -5, SNOOPSW) \
    X("draftfolder +folder", 0, SDRFSW) \
    X("draftmessage msg", 0, SDRMSW) \
    X("nodraftfolder", 0, SNDRFSW) \
    X("sasl", SASLminc(4), SASLSW) \
    X("nosasl", SASLminc(6), NOSASLSW) \
    X("saslmech", SASLminc(5), SASLMECHSW) \
    X("authservice", SASLminc(0), AUTHSERVICESW) \
    X("user username", SASLminc(4), USERSW) \
    X("port server-port-name/number", 4, PORTSW) \
    X("tls", TLSminc(-3), TLSSW) \
    X("initialtls", TLSminc(-10), INITTLSSW) \
    X("notls", TLSminc(-5), NTLSSW) \
    X("certverify", TLSminc(-10), CERTVERSW) \
    X("nocertverify", TLSminc(-12), NOCERTVERSW) \
    X("sendmail program", 0, MTSSM) \
    X("mts smtp|sendmail/smtp|sendmail/pipe", 2, MTSSW) \
    X("messageid localname|random", 2, MESSAGEIDSW) \

#define X(sw, minchars, id) id,
DEFINE_SWITCH_ENUM(SEND);
#undef X

#define X(sw, minchars, id) { sw, minchars, id },
DEFINE_SWITCH_ARRAY(SEND, sendswitches);
#undef X


extern int debugsw;             /* from sendsbr.c */
extern bool forwsw;
extern int inplace;
extern bool pushsw;
extern bool unique;
extern bool verbsw;

extern char *altmsg;            /*  .. */
extern char *annotext;
extern char *distfile;


static void
sendit (char *sp, char **arg, char *file, int pushed)
{
    int vecp, n = 1;
    char *cp, buf[BUFSIZ], **argp, *program;
    char **arguments, *savearg[MAXARGS], **vec;
    const char *user = NULL, *saslmech = NULL;
    char *auth_svc = NULL;
    struct stat st;

    /*
     * Make sure these are defined.  In particular, we need
     * savearg[1] to be NULL, in case "arg" is NULL below.  It
     * doesn't matter what is the value of savearg[0], but we
     * set it to NULL, to help catch "off-by-one" errors.
     */
    savearg[0] = NULL;
    savearg[1] = NULL;

    /*
     * Temporarily copy arg to savearg, since the brkstring() call in
     * getarguments() will wipe it out before it is merged in.
     * Also, we skip the first element of savearg, since getarguments()
     * skips it.  Then we count the number of arguments
     * copied.  The value of "n" will be one greater than
     * this in order to simulate the standard argc/argv.
     */
    if (arg) {
        char **bp;

        copyip (arg, savearg+1, MAXARGS-1);
        bp = savearg+1;
        while (*bp++)
            n++;
    }

    /*
     * Merge any arguments from command line (now in savearg)
     * and arguments from profile.
     */
    arguments = getarguments (sp, n, savearg, 1);
    argp = arguments;

    debugsw = 0;
    forwsw = true;
    inplace = 1;
    unique = false;

    altmsg = NULL;
    annotext = NULL;
    distfile = NULL;

    /*
     * Get our initial arguments for postproc now
     */

    vec = argsplit(postproc, &program, &vecp);

    vec[vecp++] = "-library";
    vec[vecp++] = mh_xstrdup(m_maildir(""));

    if ((cp = context_find ("fileproc"))) {
        vec[vecp++] = "-fileproc";
        vec[vecp++] = cp;
    }

    if ((cp = context_find ("mhlproc"))) {
        vec[vecp++] = "-mhlproc";
        vec[vecp++] = cp;
    }

    if ((cp = context_find ("credentials"))) {
        /* post doesn't read context so need to pass credentials. */
        vec[vecp++] = "-credentials";
        vec[vecp++] = cp;
    }

    while ((cp = *argp++)) {
        if (*cp == '-') {
            switch (smatch (++cp, sendswitches)) {
                case AMBIGSW:
                    ambigsw (cp, sendswitches);
                    return;
                case UNKWNSW:
                    inform("-%s unknown\n", cp);
                    return;

                case SHELPSW:
                    snprintf (buf, sizeof(buf), "%s [switches]", sp);
                    print_help (buf, sendswitches, 1);
                    return;
                case SVERSIONSW:
                    print_version (invo_name);
                    return;

                case SPSHSW:
                    pushed++;
                    continue;
                case NSPSHSW:
                    pushed = 0;
                    continue;

                case UNIQSW:
                    unique = true;
                    continue;
                case NUNIQSW:
                    unique = false;
                    continue;
                case FORWSW:
                    forwsw = true;
                    continue;
                case NFORWSW:
                    forwsw = false;
                    continue;

                case VERBSW:
                    verbsw = true;
                    vec[vecp++] = --cp;
                    continue;
                case NVERBSW:
                    verbsw = false;
                    vec[vecp++] = --cp;
                    continue;

                case DEBUGSW:
                    debugsw++;
                    /* FALLTHRU */
                case NFILTSW:
                case FRMTSW:
                case NFRMTSW:
                case BITSTUFFSW:
                case NBITSTUFFSW:
                case MIMESW:
                case NMIMESW:
                case MSGDSW:
                case NMSGDSW:
                case WATCSW:
                case NWATCSW:
                case SASLSW:
                case NOSASLSW:
                case TLSSW:
                case INITTLSSW:
                case NTLSSW:
                case CERTVERSW:
                case NOCERTVERSW:
                    vec[vecp++] = --cp;
                    continue;

                case SNOOPSW:
                    vec[vecp++] = --cp;
                    continue;

                case AUTHSERVICESW:
#ifdef OAUTH_SUPPORT
                    if (!(auth_svc = *argp++) || *auth_svc == '-')
                        die("missing argument to %s", argp[-2]);
#else
                    NMH_UNUSED (user);
                    NMH_UNUSED (auth_svc);
                    die("not built with OAuth support");
#endif
                    continue;

                case SASLMECHSW:
                    saslmech = *argp;
                    /* FALLTHRU */
                case ALIASW:
                case FILTSW:
                case WIDTHSW:
                case CLIESW:
                case SERVSW:
                case USERSW:
                case PORTSW:
                case MTSSM:
                case MTSSW:
                case MESSAGEIDSW:
                    vec[vecp++] = --cp;
                    if (!(cp = *argp++) || *cp == '-') {
                        inform("missing argument to %s", argp[-2]);
                        return;
                    }
                    vec[vecp++] = cp;
                    user = cp;
                    continue;

                case SDRFSW:
                case SDRMSW:
                    if (!(cp = *argp++) || *cp == '-') {
                        inform("missing argument to %s", argp[-2]);
                        return;
                    }
                    continue;
                case SNDRFSW:
                    continue;
            }
        }
        inform("usage: %s [switches]", sp);
        return;
    }

    /* allow Aliasfile: profile entry */
    if ((cp = context_find ("Aliasfile"))) {
        char **ap, *dp;

        dp = mh_xstrdup(cp);
        for (ap = brkstring (dp, " ", "\n"); ap && *ap; ap++) {
            vec[vecp++] = "-alias";
            vec[vecp++] = *ap;
        }
    }

    if ((cp = getenv ("SIGNATURE")) == NULL || *cp == 0)
        if ((cp = context_find ("signature")) && *cp)
            setenv("SIGNATURE", cp, 1);

    if ((annotext = getenv ("mhannotate")) == NULL || *annotext == 0)
        annotext = NULL;
    if ((altmsg = getenv ("mhaltmsg")) == NULL || *altmsg == 0)
        altmsg = NULL;
    if (annotext && ((cp = getenv ("mhinplace")) != NULL && *cp != 0))
        inplace = atoi (cp);

    if ((cp = getenv ("mhdist"))
            && *cp
            && atoi(cp)
            && altmsg) {
        vec[vecp++] = "-dist";
        if ((cp = m_mktemp2(altmsg, invo_name, NULL, NULL)) == NULL) {
            die("unable to create temporary file");
        }
        distfile = mh_xstrdup(cp);
        (void) m_unlink(distfile);
        if (link (altmsg, distfile) == NOTOK)
            adios (distfile, "unable to link %s to", altmsg);
    } else {
        distfile = NULL;
    }

#ifdef OAUTH_SUPPORT
    if (auth_svc == NULL) {
        if (saslmech  &&  ! strcasecmp(saslmech, "xoauth2")) {
            die("must specify -authservice with -saslmech xoauth2");
        }
    } else {
        if (user == NULL) {
            die("must specify -user with -saslmech xoauth2");
        }
    }
#else
    NMH_UNUSED(saslmech);
#endif /* OAUTH_SUPPORT */

    if (altmsg == NULL || stat (altmsg, &st) == NOTOK) {
        st.st_mtime = 0;
        st.st_dev = 0;
        st.st_ino = 0;
    }
    if ((pushsw = pushed))
        push ();

    if (sendsbr (vec, vecp, program, file, &st, 1, auth_svc) == OK)
        done (0);
}

/*
 * WHOM
 */

static int
whomfile (char **arg, char *file)
{
    pid_t pid;
    int vecp;
    char **vec, *program;

    context_save ();    /* save the context file */
    fflush (stdout);

    switch (pid = fork()) {
        case NOTOK:
            advise ("fork", "unable to");
            return 1;

        case OK:
            vec = argsplit(whomproc, &program, &vecp);
            if (arg)
                while (*arg)
                    vec[vecp++] = *arg++;
            vec[vecp++] = file;
            vec[vecp] = NULL;

            execvp (program, vec);
            fprintf (stderr, "unable to exec ");
            perror (whomproc);
            _exit(1);           /* NOTREACHED */

        default:
            return pidwait(pid, NOTOK) & 0377 ? 1 : 0;
    }
}


/*
 * Remove the draft file
 */

static int
removefile (char *drft)
{
    if (m_unlink (drft) == NOTOK)
        adios (drft, "unable to unlink");

    return OK;
}


/*
 * Return 1 if we already have a MIME-Version header, 0 otherwise.
 */

static int
checkmimeheader (char *drft)
{
    FILE *f;
    m_getfld_state_t gstate;
    char buf[NMH_BUFSIZ], name[NAMESZ];
    int state;
    bool retval = false;

    if ((f = fopen(drft, "r")) == NULL) {
        admonish(drft, "unable to read draft");
        return 0;
    }

    gstate = m_getfld_state_init(f);
    for (;;) {
        int bufsz = sizeof(buf);
        switch (state = m_getfld2(&gstate, name, buf, &bufsz)) {
        case FLD:
        case FLDPLUS:
            if (strcasecmp(name, VRSN_FIELD) == 0) {
                inform("Cannot use attach commands with already-"
                       "formatted MIME message \"%s\"", drft);
                retval = true;
                break;
            }
            continue;
        default:
            break;
        }
        break;
    }

    m_getfld_state_destroy(&gstate);
    fclose(f);

    return retval;
}