acme9k/look.c

#include <u.h>
#include <libc.h>
#include <draw.h>
#include <thread.h>
#include <cursor.h>
#include <mouse.h>
#include <keyboard.h>
#include <frame.h>
#include <fcall.h>
#include <regexp.h>
#include <9pclient.h>
#include <plumb.h>
#include <libsec.h>
#include "dat.h"
#include "fns.h"

CFid* plumbsendfid;
CFid* plumbeditfid;

Window* openfile(Text*, Expand*);

int nuntitled;

void plumbthread(void* v) {
  CFid* fid;
  Plumbmsg* m;
  Timer* t;

  USED(v);
  threadsetname("plumbproc");

  /*
   * Loop so that if plumber is restarted, acme need not be.
   */
  for (;;) {
    /*
     * Connect to plumber.
     */
    plumbunmount();
    while ((fid = plumbopenfid("edit", OREAD | OCEXEC)) == nil) {
      t = timerstart(2000);
      recv(t->c, nil);
      timerstop(t);
    }
    plumbeditfid = fid;
    plumbsendfid = plumbopenfid("send", OWRITE | OCEXEC);

    /*
     * Relay messages.
     */
    for (;;) {
      m = plumbrecvfid(plumbeditfid);
      if (m == nil)
        break;
      sendp(cplumb, m);
    }

    /*
     * Lost connection.
     */
    fid = plumbsendfid;
    plumbsendfid = nil;
    fsclose(fid);

    fid = plumbeditfid;
    plumbeditfid = nil;
    fsclose(fid);
  }
}

void startplumbing(void) {
  cplumb = chancreate(sizeof(Plumbmsg*), 0);
  chansetname(cplumb, "cplumb");
  threadcreate(plumbthread, nil, STACK);
}

void look3(Text* t, uint q0, uint q1, int external) {
  int n, c, f, expanded;
  Text* ct;
  Expand e;
  Rune* r;
  uint p;
  Plumbmsg* m;
  Runestr dir;
  char buf[32];

  ct = seltext;
  if (ct == nil)
    seltext = t;
  expanded = expand(t, q0, q1, &e);
  if (!external && t->w != nil && t->w->nopen[QWevent] > 0) {
    /* send alphanumeric expansion to external client */
    if (expanded == FALSE)
      return;
    f = 0;
    if (
      (e.u.at != nil && t->w != nil) ||
      (e.nname > 0 && lookfile(e.name, e.nname) != nil))
      f = 1; /* acme can do it without loading a file */
    if (q0 != e.q0 || q1 != e.q1)
      f |= 2; /* second (post-expand) message follows */
    if (e.nname)
      f |= 4; /* it's a file name */
    c = 'l';
    if (t->what == Body)
      c = 'L';
    n = q1 - q0;
    if (n <= EVENTSIZE) {
      r = runemalloc(n);
      bufread(&t->file->b, q0, r, n);
      winevent(t->w, "%c%d %d %d %d %.*S\n", c, q0, q1, f, n, n, r);
      free(r);
    } else
      winevent(t->w, "%c%d %d %d 0 \n", c, q0, q1, f, n);
    if (q0 == e.q0 && q1 == e.q1)
      return;
    if (e.nname) {
      n = e.nname;
      if (e.a1 > e.a0)
        n += 1 + (e.a1 - e.a0);
      r = runemalloc(n);
      runemove(r, e.name, e.nname);
      if (e.a1 > e.a0) {
        r[e.nname] = ':';
        bufread(&e.u.at->file->b, e.a0, r + e.nname + 1, e.a1 - e.a0);
      }
    } else {
      n = e.q1 - e.q0;
      r = runemalloc(n);
      bufread(&t->file->b, e.q0, r, n);
    }
    f &= ~2;
    if (n <= EVENTSIZE)
      winevent(t->w, "%c%d %d %d %d %.*S\n", c, e.q0, e.q1, f, n, n, r);
    else
      winevent(t->w, "%c%d %d %d 0 \n", c, e.q0, e.q1, f, n);
    free(r);
    goto Return;
  }
  if (plumbsendfid != nil) {
    /* send whitespace-delimited word to plumber */
    m = emalloc(sizeof(Plumbmsg));
    m->src = estrdup("acme");
    m->dst = nil;
    dir = dirname(t, nil, 0);
    if (dir.nr == 1 && dir.r[0] == '.') { /* sigh */
      free(dir.r);
      dir.r = nil;
      dir.nr = 0;
    }
    if (dir.nr == 0)
      m->wdir = estrdup(wdir);
    else
      m->wdir = runetobyte(dir.r, dir.nr);
    free(dir.r);
    m->type = estrdup("text");
    m->attr = nil;
    buf[0] = '\0';
    if (q1 == q0) {
      if (t->q1 > t->q0 && t->q0 <= q0 && q0 <= t->q1) {
        q0 = t->q0;
        q1 = t->q1;
      } else {
        p = q0;
        while (q0 > 0 && (c = tgetc(t, q0 - 1)) != ' ' && c != '\t' &&
               c != '\n')
          q0--;
        while (q1 < t->file->b.nc && (c = tgetc(t, q1)) != ' ' && c != '\t' &&
               c != '\n')
          q1++;
        if (q1 == q0) {
          plumbfree(m);
          goto Return;
        }
        sprint(buf, "click=%d", p - q0);
        m->attr = plumbunpackattr(buf);
      }
    }
    r = runemalloc(q1 - q0);
    bufread(&t->file->b, q0, r, q1 - q0);
    m->data = runetobyte(r, q1 - q0);
    m->ndata = strlen(m->data);
    free(r);
    if (m->ndata < messagesize - 1024 && plumbsendtofid(plumbsendfid, m) >= 0) {
      plumbfree(m);
      goto Return;
    }
    plumbfree(m);
    /* plumber failed to match; fall through */
  }

  /* interpret alphanumeric string ourselves */
  if (expanded == FALSE)
    return;
  if (e.name || e.u.at)
    openfile(t, &e);
  else {
    if (t->w == nil)
      return;
    ct = &t->w->body;
    if (t->w != ct->w)
      winlock(ct->w, 'M');
    if (t == ct)
      textsetselect(ct, e.q1, e.q1);
    n = e.q1 - e.q0;
    r = runemalloc(n);
    bufread(&t->file->b, e.q0, r, n);
    if (search(ct, r, n) && e.jump)
      moveto(
        mousectl,
        addpt(frptofchar(&ct->fr, ct->fr.p0), Pt(4, ct->fr.font->height - 4)));
    if (t->w != ct->w)
      winunlock(ct->w);
    free(r);
  }

Return:
  free(e.name);
  free(e.bname);
}

int plumbgetc(void* a, uint n) {
  Rune* r;

  r = a;
  if (n > runestrlen(r))
    return 0;
  return r[n];
}

void plumblook(Plumbmsg* m) {
  Expand e;
  char* addr;

  if (m->ndata >= BUFSIZE) {
    warning(
      nil,
      "insanely long file name (%d bytes) in plumb message (%.32s...)\n",
      m->ndata,
      m->data);
    return;
  }
  e.q0 = 0;
  e.q1 = 0;
  if (m->data[0] == '\0')
    return;
  e.u.ar = nil;
  e.bname = m->data;
  e.name = bytetorune(e.bname, &e.nname);
  e.jump = TRUE;
  e.a0 = 0;
  e.a1 = 0;
  addr = plumblookup(m->attr, "addr");
  if (addr != nil) {
    e.u.ar = bytetorune(addr, &e.a1);
    e.agetc = plumbgetc;
  }
  drawtopwindow();
  openfile(nil, &e);
  free(e.name);
  free(e.u.at);
}

void plumbshow(Plumbmsg* m) {
  Window* w;
  Rune rb[256], *r;
  int nb, nr;
  Runestr rs;
  char *name, *p, namebuf[16];

  drawtopwindow();
  w = makenewwindow(nil);
  name = plumblookup(m->attr, "filename");
  if (name == nil) {
    name = namebuf;
    nuntitled++;
    snprint(namebuf, sizeof namebuf, "Untitled-%d", nuntitled);
  }
  p = nil;
  if (name[0] != '/' && m->wdir != nil && m->wdir[0] != '\0') {
    nb = strlen(m->wdir) + 1 + strlen(name) + 1;
    p = emalloc(nb);
    snprint(p, nb, "%s/%s", m->wdir, name);
    name = p;
  }
  cvttorunes(name, strlen(name), rb, &nb, &nr, nil);
  free(p);
  rs = cleanrname(runestr(rb, nr));
  winsetname(w, rs.r, rs.nr);
  r = runemalloc(m->ndata);
  cvttorunes(m->data, m->ndata, r, &nb, &nr, nil);
  textinsert(&w->body, 0, r, nr, TRUE);
  free(r);
  w->body.file->mod = FALSE;
  w->dirty = FALSE;
  winsettag(w);
  textscrdraw(&w->body);
  textsetselect(&w->tag, w->tag.file->b.nc, w->tag.file->b.nc);
  xfidlog(w, "new");
}

int search(Text* ct, Rune* r, uint n) {
  uint q, nb, maxn;
  int around;
  Rune *s, *b, *c;

  if (n == 0 || n > ct->file->b.nc)
    return FALSE;
  if (2 * n > RBUFSIZE) {
    warning(nil, "string too long\n");
    return FALSE;
  }
  maxn = max(2 * n, RBUFSIZE);
  s = fbufalloc();
  b = s;
  nb = 0;
  b[nb] = 0;
  around = 0;
  q = ct->q1;
  for (;;) {
    if (q >= ct->file->b.nc) {
      q = 0;
      around = 1;
      nb = 0;
      b[nb] = 0;
    }
    if (nb > 0) {
      c = runestrchr(b, r[0]);
      if (c == nil) {
        q += nb;
        nb = 0;
        b[nb] = 0;
        if (around && q >= ct->q1)
          break;
        continue;
      }
      q += (c - b);
      nb -= (c - b);
      b = c;
    }
    /* reload if buffer covers neither string nor rest of file */
    if (nb < n && nb != ct->file->b.nc - q) {
      nb = ct->file->b.nc - q;
      if (nb >= maxn)
        nb = maxn - 1;
      bufread(&ct->file->b, q, s, nb);
      b = s;
      b[nb] = '\0';
    }
    /* this runeeq is fishy but the null at b[nb] makes it safe */
    if (runeeq(b, n, r, n) == TRUE) {
      if (ct->w) {
        textshow(ct, q, q + n, 1);
        winsettag(ct->w);
      } else {
        ct->q0 = q;
        ct->q1 = q + n;
      }
      seltext = ct;
      fbuffree(s);
      return TRUE;
    }
    --nb;
    b++;
    q++;
    if (around && q >= ct->q1)
      break;
  }
  fbuffree(s);
  return FALSE;
}

int isfilec(Rune r) {
  static Rune Lx[] = {'.', '-', '+', '/', ':', 0};
  if (isalnum(r))
    return TRUE;
  if (runestrchr(Lx, r))
    return TRUE;
  return FALSE;
}

/* Runestr wrapper for cleanname */
Runestr cleanrname(Runestr rs) {
  char* s;
  int nb, nulls;

  s = runetobyte(rs.r, rs.nr);
  cleanname(s);
  cvttorunes(s, strlen(s), rs.r, &nb, &rs.nr, &nulls);
  free(s);
  return rs;
}

Runestr includefile(Rune* dir, Rune* file, int nfile) {
  int m, n;
  char* a;
  Rune* r;
  static Rune Lslash[] = {'/', 0};

  m = runestrlen(dir);
  a = emalloc((m + 1 + nfile) * UTFmax + 1);
  sprint(a, "%S/%.*S", dir, nfile, file);
  n = access(a, 0);
  free(a);
  if (n < 0)
    return runestr(nil, 0);
  r = runemalloc(m + 1 + nfile);
  runemove(r, dir, m);
  runemove(r + m, Lslash, 1);
  runemove(r + m + 1, file, nfile);
  free(file);
  return cleanrname(runestr(r, m + 1 + nfile));
}

static Rune* objdir;

Runestr includename(Text* t, Rune* r, int n) {
  Window* w;
  char buf[128];
  Rune Lsysinclude[] =
    {'/', 's', 'y', 's', '/', 'i', 'n', 'c', 'l', 'u', 'd', 'e', 0};
  Rune Lusrinclude[] =
    {'/', 'u', 's', 'r', '/', 'i', 'n', 'c', 'l', 'u', 'd', 'e', 0};
  Rune Lusrlocalinclude[] = {
    '/',
    'u',
    's',
    'r',
    '/',
    'l',
    'o',
    'c',
    'a',
    'l',
    '/',
    'i',
    'n',
    'c',
    'l',
    'u',
    'd',
    'e',
    0};
  Rune Lusrlocalplan9include[] = {'/', 'u', 's', 'r', '/', 'l', 'o', 'c', 'a',
                                  'l', '/', 'p', 'l', 'a', 'n', '9', '/', 'i',
                                  'n', 'c', 'l', 'u', 'd', 'e', 0};
  Runestr file;
  int i;

  if (objdir == nil && objtype != nil) {
    sprint(buf, "/%s/include", objtype);
    objdir = bytetorune(buf, &i);
    objdir = runerealloc(objdir, i + 1);
    objdir[i] = '\0';
  }

  w = t->w;
  if (n == 0 || r[0] == '/' || w == nil)
    goto Rescue;
  if (n > 2 && r[0] == '.' && r[1] == '/')
    goto Rescue;
  file.r = nil;
  file.nr = 0;
  for (i = 0; i < w->nincl && file.r == nil; i++)
    file = includefile(w->incl[i], r, n);

  if (file.r == nil)
    file = includefile(Lsysinclude, r, n);
  if (file.r == nil)
    file = includefile(Lusrlocalplan9include, r, n);
  if (file.r == nil)
    file = includefile(Lusrlocalinclude, r, n);
  if (file.r == nil)
    file = includefile(Lusrinclude, r, n);
  if (file.r == nil && objdir != nil)
    file = includefile(objdir, r, n);
  if (file.r == nil)
    goto Rescue;
  return file;

Rescue:
  return runestr(r, n);
}

Runestr dirname(Text* t, Rune* r, int n) {
  Rune* b;
  uint nt;
  int slash, i;
  Runestr tmp;

  b = nil;
  if (t == nil || t->w == nil)
    goto Rescue;
  nt = t->w->tag.file->b.nc;
  if (nt == 0)
    goto Rescue;
  if (n >= 1 && r[0] == '/')
    goto Rescue;
  b = parsetag(t->w, n, &i);
  slash = -1;
  for (i--; i >= 0; i--) {
    if (b[i] == '/') {
      slash = i;
      break;
    }
  }
  if (slash < 0)
    goto Rescue;
  runemove(b + slash + 1, r, n);
  free(r);
  return cleanrname(runestr(b, slash + 1 + n));

Rescue:
  free(b);
  tmp = runestr(r, n);
  if (r)
    return cleanrname(tmp);
  return tmp;
}

static int texthas(Text* t, uint q0, Rune* r) {
  int i;

  if ((int)q0 < 0)
    return FALSE;
  for (i = 0; r[i]; i++)
    if (q0 + i >= t->file->b.nc || textreadc(t, q0 + i) != r[i])
      return FALSE;
  return TRUE;
}

int expandfile(Text* t, uint q0, uint q1, Expand* e) {
  int i, n, nname, colon, eval;
  uint amin, amax;
  Rune *r, c;
  Window* w;
  Runestr rs;
  Rune Lhttpcss[] = {'h', 't', 't', 'p', ':', '/', '/', 0};
  Rune Lhttpscss[] = {'h', 't', 't', 'p', 's', ':', '/', '/', 0};

  amax = q1;
  if (q1 == q0) {
    colon = -1;
    while (q1 < t->file->b.nc && isfilec(c = textreadc(t, q1))) {
      if (
        c == ':' && !texthas(t, q1 - 4, Lhttpcss) &&
        !texthas(t, q1 - 5, Lhttpscss)) {
        colon = q1;
        break;
      }
      q1++;
    }
    while (q0 > 0 &&
           (isfilec(c = textreadc(t, q0 - 1)) || isaddrc(c) || isregexc(c))) {
      q0--;
      if (
        colon < 0 && c == ':' && !texthas(t, q0 - 4, Lhttpcss) &&
        !texthas(t, q0 - 5, Lhttpscss))
        colon = q0;
    }
    /*
     * if it looks like it might begin file: , consume address chars after :
     * otherwise terminate expansion at :
     */
    if (colon >= 0) {
      q1 = colon;
      if (colon < t->file->b.nc - 1 && isaddrc(textreadc(t, colon + 1))) {
        q1 = colon + 1;
        while (q1 < t->file->b.nc && isaddrc(textreadc(t, q1)))
          q1++;
      }
    }
    if (q1 > q0)
      if (colon >= 0) { /* stop at white space */
        for (amax = colon + 1; amax < t->file->b.nc; amax++)
          if ((c = textreadc(t, amax)) == ' ' || c == '\t' || c == '\n')
            break;
      } else
        amax = t->file->b.nc;
  }
  amin = amax;
  e->q0 = q0;
  e->q1 = q1;
  n = q1 - q0;
  if (n == 0)
    return FALSE;
  /* see if it's a file name */
  r = runemalloc(n + 1);
  bufread(&t->file->b, q0, r, n);
  r[n] = 0;
  /* is it a URL? look for http:// and https:// prefix */
  if (runestrncmp(r, Lhttpcss, 7) == 0 || runestrncmp(r, Lhttpscss, 8) == 0) {
    // Avoid capturing end-of-sentence punctuation.
    if (r[n - 1] == '.') {
      e->q1--;
      n--;
    }
    e->name = r;
    e->nname = n;
    e->u.at = t;
    e->a0 = e->q1;
    e->a1 = e->q1;
    return TRUE;
  }
  /* first, does it have bad chars? */
  nname = -1;
  for (i = 0; i < n; i++) {
    c = r[i];
    if (c == ':' && nname < 0) {
      if (
        q0 + i + 1 < t->file->b.nc &&
        (i == n - 1 || isaddrc(textreadc(t, q0 + i + 1))))
        amin = q0 + i;
      else
        goto Isntfile;
      nname = i;
    }
  }
  if (nname == -1)
    nname = n;
  for (i = 0; i < nname; i++)
    if (!isfilec(r[i]) && r[i] != ' ')
      goto Isntfile;
  /*
   * See if it's a file name in <>, and turn that into an include
   * file name if so.  Should probably do it for "" too, but that's not
   * restrictive enough syntax and checking for a #include earlier on the
   * line would be silly.
   */
  if (
    q0 > 0 && textreadc(t, q0 - 1) == '<' && q1 < t->file->b.nc &&
    textreadc(t, q1) == '>') {
    rs = includename(t, r, nname);
    r = rs.r;
    nname = rs.nr;
  } else if (amin == q0)
    goto Isfile;
  else {
    rs = dirname(t, r, nname);
    r = rs.r;
    nname = rs.nr;
  }
  e->bname = runetobyte(r, nname);
  /* if it's already a window name, it's a file */
  w = lookfile(r, nname);
  if (w != nil)
    goto Isfile;
  /* if it's the name of a file, it's a file */
  if (ismtpt(e->bname) || access(e->bname, 0) < 0) {
    free(e->bname);
    e->bname = nil;
    goto Isntfile;
  }

Isfile:
  e->name = r;
  e->nname = nname;
  e->u.at = t;
  e->a0 = amin + 1;
  eval = FALSE;
  address(
    TRUE,
    nil,
    range(-1, -1),
    range(0, 0),
    t,
    e->a0,
    amax,
    tgetc,
    &eval,
    (uint*)&e->a1);
  return TRUE;

Isntfile:
  free(r);
  return FALSE;
}

int expand(Text* t, uint q0, uint q1, Expand* e) {
  memset(e, 0, sizeof *e);
  e->agetc = tgetc;
  /* if in selection, choose selection */
  e->jump = TRUE;
  if (q1 == q0 && t->q1 > t->q0 && t->q0 <= q0 && q0 <= t->q1) {
    q0 = t->q0;
    q1 = t->q1;
    if (t->what == Tag)
      e->jump = FALSE;
  }

  if (expandfile(t, q0, q1, e))
    return TRUE;

  if (q0 == q1) {
    while (q1 < t->file->b.nc && isalnum(textreadc(t, q1)))
      q1++;
    while (q0 > 0 && isalnum(textreadc(t, q0 - 1)))
      q0--;
  }
  e->q0 = q0;
  e->q1 = q1;
  return q1 > q0;
}

Window* lookfile(Rune* s, int n) {
  int i, j, k;
  Window* w;
  Column* c;
  Text* t;

  /* avoid terminal slash on directories */
  if (n > 1 && s[n - 1] == '/')
    --n;
  for (j = 0; j < row.ncol; j++) {
    c = row.col[j];
    for (i = 0; i < c->nw; i++) {
      w = c->w[i];
      t = &w->body;
      k = t->file->nname;
      if (k > 1 && t->file->name[k - 1] == '/')
        k--;
      if (runeeq(t->file->name, k, s, n)) {
        w = w->body.file->curtext->w;
        if (w->col != nil) /* protect against race deleting w */
          return w;
      }
    }
  }
  return nil;
}

Window* lookid(int id, int dump) {
  int i, j;
  Window* w;
  Column* c;

  for (j = 0; j < row.ncol; j++) {
    c = row.col[j];
    for (i = 0; i < c->nw; i++) {
      w = c->w[i];
      if (dump && w->dumpid == id)
        return w;
      if (!dump && w->id == id)
        return w;
    }
  }
  return nil;
}

Window* openfile(Text* t, Expand* e) {
  Range r;
  Window *w, *ow;
  int eval, i, n;
  Rune* rp;
  Runestr rs;
  uint dummy;

  r.q0 = 0;
  r.q1 = 0;
  if (e->nname == 0) {
    w = t->w;
    if (w == nil)
      return nil;
  } else {
    w = lookfile(e->name, e->nname);
    if (w == nil && e->name[0] != '/') {
      /*
       * Unrooted path in new window.
       * This can happen if we type a pwd-relative path
       * in the topmost tag or the column tags.
       * Most of the time plumber takes care of these,
       * but plumber might not be running or might not
       * be configured to accept plumbed directories.
       * Make the name a full path, just like we would if
       * opening via the plumber.
       */
      n = utflen(wdir) + 1 + e->nname + 1;
      rp = runemalloc(n);
      runesnprint(rp, n, "%s/%.*S", wdir, e->nname, e->name);
      rs = cleanrname(runestr(rp, n - 1));
      free(e->name);
      e->name = rs.r;
      e->nname = rs.nr;
      w = lookfile(e->name, e->nname);
    }
  }
  if (w) {
    t = &w->body;
    if (!t->col->safe && t->fr.maxlines == 0) /* window is obscured by
                                                 full-column window */
      colgrow(t->col, t->col->w[0], 1);
  } else {
    ow = nil;
    if (t)
      ow = t->w;
    w = makenewwindow(t);
    t = &w->body;
    winsetname(w, e->name, e->nname);
    if (textload(t, 0, e->bname, 1) >= 0)
      t->file->unread = FALSE;
    t->file->mod = FALSE;
    t->w->dirty = FALSE;
    winsettag(t->w);
    textsetselect(&t->w->tag, t->w->tag.file->b.nc, t->w->tag.file->b.nc);
    if (ow != nil) {
      for (i = ow->nincl; --i >= 0;) {
        n = runestrlen(ow->incl[i]);
        rp = runemalloc(n);
        runemove(rp, ow->incl[i], n);
        winaddincl(w, rp, n);
      }
      for (i = 0; i < NINDENT; i++)
        w->indent[i] = ow->indent[i];
    } else
      for (i = 0; i < NINDENT; i++)
        w->indent[i] = globalindent[i];
    xfidlog(w, "new");
  }
  if (e->a1 == e->a0)
    eval = FALSE;
  else {
    eval = TRUE;
    r = address(
      TRUE,
      t,
      range(-1, -1),
      range(t->q0, t->q1),
      e->u.at,
      e->a0,
      e->a1,
      e->agetc,
      &eval,
      &dummy);
    if (r.q0 > r.q1) {
      eval = FALSE;
      warning(nil, "addresses out of order\n");
    }
    if (eval == FALSE)
      e->jump = FALSE; /* don't jump if invalid address */
  }
  if (eval == FALSE) {
    r.q0 = t->q0;
    r.q1 = t->q1;
  }
  textshow(t, r.q0, r.q1, 1);
  winsettag(t->w);
  seltext = t;
  if (e->jump)
    moveto(
      mousectl,
      addpt(frptofchar(&t->fr, t->fr.p0), Pt(4, font->height - 4)));
  return w;
}

void new (
  Text* et, Text* t, Text* argt, int flag1, int flag2, Rune* arg, int narg) {
  int ndone;
  Rune *a, *f;
  int na, nf;
  Expand e;
  Runestr rs;
  Window* w;

  getarg(argt, FALSE, TRUE, &a, &na);
  if (a) {
    new (et, t, nil, flag1, flag2, a, na);
    if (narg == 0)
      return;
  }
  /* loop condition: *arg is not a blank */
  for (ndone = 0;; ndone++) {
    a = findbl(arg, narg, &na);
    if (a == arg) {
      if (ndone == 0 && et->col != nil) {
        w = coladd(et->col, nil, nil, -1);
        winsettag(w);
        xfidlog(w, "new");
      }
      break;
    }
    nf = narg - na;
    f = runemalloc(nf);
    runemove(f, arg, nf);
    rs = dirname(et, f, nf);
    memset(&e, 0, sizeof e);
    e.name = rs.r;
    e.nname = rs.nr;
    e.bname = runetobyte(rs.r, rs.nr);
    e.jump = TRUE;
    openfile(et, &e);
    free(e.name);
    free(e.bname);
    arg = skipbl(a, na, &narg);
  }
}