window.c

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#include "config.h"
#include <stdbool.h>
#include <stdio.h>
#include "private.h"
#include "mutt/lib.h"
#include "address/lib.h"
#include "config/lib.h"
#include "email/lib.h"
#include "core/lib.h"
#include "gui/lib.h"
#include "color/lib.h"
#include "ncrypt/lib.h"
#include "functions.h"
#include "globals.h"
#include "wdata.h"
#ifdef ENABLE_NLS
#include <libintl.h>
#endif

#define MAX_ADDR_ROWS 5

#define MAX_USER_HDR_ROWS 5

static int HeaderPadding[HDR_ATTACH_TITLE] = { 0 };
static int MaxHeaderWidth = 0;

const char *const Prompts[] = {
  /* L10N: Compose menu field.  May not want to translate. */
  N_("From: "),
  /* L10N: Compose menu field.  May not want to translate. */
  N_("To: "),
  /* L10N: Compose menu field.  May not want to translate. */
  N_("Cc: "),
  /* L10N: Compose menu field.  May not want to translate. */
  N_("Bcc: "),
  /* L10N: Compose menu field.  May not want to translate. */
  N_("Subject: "),
  /* L10N: Compose menu field.  May not want to translate. */
  N_("Reply-To: "),
  /* L10N: Compose menu field.  May not want to translate. */
  N_("Fcc: "),
  /* L10N: Compose menu field.  Holds "Encrypt", "Sign" related information */
  N_("Security: "),
  /* L10N: This string is used by the compose menu.
     Since it is hidden by default, it does not increase the indentation of
     other compose menu fields.  However, if possible, it should not be longer
     than the other compose menu fields.  Since it shares the row with "Encrypt
     with:", it should not be longer than 15-20 character cells.  */
  N_("Sign as: "),
#ifdef USE_AUTOCRYPT
  // L10N: The compose menu autocrypt line
  N_("Autocrypt: "),
#endif
  /* L10N: Compose menu field.  May not want to translate. */
  N_("Newsgroups: "),
  /* L10N: Compose menu field.  May not want to translate. */
  N_("Followup-To: "),
  /* L10N: Compose menu field.  May not want to translate. */
  N_("X-Comment-To: "),
  N_("Headers: "),
};
 
#ifdef USE_AUTOCRYPT
static const char *const AutocryptRecUiFlags[] = {
  /* L10N: Autocrypt recommendation flag: off.
     This is displayed when Autocrypt is turned off. */
  N_("Off"),
  /* L10N: Autocrypt recommendation flag: no.
     This is displayed when Autocrypt cannot encrypt to the recipients. */
  N_("No"),
  /* L10N: Autocrypt recommendation flag: discouraged.
     This is displayed when Autocrypt believes encryption should not be used.
     This might occur if one of the recipient Autocrypt Keys has not been
     used recently, or if the only key available is a Gossip Header key. */
  N_("Discouraged"),
  /* L10N: Autocrypt recommendation flag: available.
     This is displayed when Autocrypt believes encryption is possible, but
     leaves enabling it up to the sender.  Probably because "prefer encrypt"
     is not set in both the sender and recipient keys. */
  N_("Available"),
  /* L10N: Autocrypt recommendation flag: yes.
     This is displayed when Autocrypt would normally enable encryption
     automatically. */
  N_("Yes"),
};
#endif

static void calc_header_width_padding(int idx, const char *header, bool calc_max)
{
  int width;
 
  HeaderPadding[idx] = mutt_str_len(header);
  width = mutt_strwidth(header);
  if (calc_max && (MaxHeaderWidth < width))
    MaxHeaderWidth = width;
  HeaderPadding[idx] -= width;
}

static void init_header_padding(void)
{
  static bool done = false;
 
  if (done)
    return;
  done = true;
 
  for (int i = 0; i < HDR_ATTACH_TITLE; i++)
  {
    if (i == HDR_CRYPTINFO)
      continue;
    calc_header_width_padding(i, _(Prompts[i]), true);
  }
 
  /* Don't include "Sign as: " in the MaxHeaderWidth calculation.  It
   * doesn't show up by default, and so can make the indentation of
   * the other fields look funny. */
  calc_header_width_padding(HDR_CRYPTINFO, _(Prompts[HDR_CRYPTINFO]), false);
 
  for (int i = 0; i < HDR_ATTACH_TITLE; i++)
  {
    HeaderPadding[i] += MaxHeaderWidth;
    if (HeaderPadding[i] < 0)
      HeaderPadding[i] = 0;
  }
}

static int calc_address(struct AddressList *al, short cols, short *srows)
{
  struct ListHead slist = STAILQ_HEAD_INITIALIZER(slist);
  mutt_addrlist_write_list(al, &slist);
 
  short rows = 1;
  int addr_len;
  int width_left = cols;
  struct ListNode *next = NULL;
  struct ListNode *np = NULL;
  STAILQ_FOREACH(np, &slist, entries)
  {
    next = STAILQ_NEXT(np, entries);
    addr_len = mutt_strwidth(np->data);
    if (next)
      addr_len += 2; // ", "
 
  try_again:
    if (addr_len >= width_left)
    {
      if (width_left == cols)
        break;
 
      rows++;
      width_left = cols;
      goto try_again;
    }
 
    if (addr_len < width_left)
      width_left -= addr_len;
  }
 
  mutt_list_free(&slist);
 
  *srows = MIN(rows, MAX_ADDR_ROWS);
  return *srows;
}

static int calc_security(struct Email *e, short *rows, const struct ConfigSubset *sub)
{
  if ((WithCrypto & (APPLICATION_PGP | APPLICATION_SMIME)) == 0)
    *rows = 0; // Neither PGP nor SMIME are built into NeoMutt
  else if ((e->security & (SEC_ENCRYPT | SEC_SIGN)) != 0)
    *rows = 2; // 'Security:' and 'Sign as:'
  else
    *rows = 1; // Just 'Security:'
 
#ifdef USE_AUTOCRYPT
  const bool c_autocrypt = cs_subset_bool(sub, "autocrypt");
  if (c_autocrypt)
    *rows += 1;
#endif
 
  return *rows;
}

static int calc_user_hdrs(const struct ListHead *hdrs)
{
  int rows = 0; /* Don't print at all if no custom headers*/
  struct ListNode *np = NULL;
  STAILQ_FOREACH(np, hdrs, entries)
  {
    if (rows == MAX_USER_HDR_ROWS)
      break;
    rows++;
  }
  return rows;
}

static int calc_envelope(struct MuttWindow *win, struct EnvelopeWindowData *wdata)
{
  int rows = 4; // 'From:', 'Subject:', 'Reply-To:', 'Fcc:'
  struct Email *e = wdata->email;
 
  struct Envelope *env = e->env;
  const int cols = win->state.cols - MaxHeaderWidth;
 
  if (wdata->is_news)
  {
    rows += 2; // 'Newsgroups:' and 'Followup-To:'
    const bool c_x_comment_to = cs_subset_bool(wdata->sub, "x_comment_to");
    if (c_x_comment_to)
      rows++;
  }
  else
  {
    rows += calc_address(&env->to, cols, &wdata->to_rows);
    rows += calc_address(&env->cc, cols, &wdata->cc_rows);
    rows += calc_address(&env->bcc, cols, &wdata->bcc_rows);
  }
  rows += calc_security(e, &wdata->sec_rows, wdata->sub);
  const bool c_compose_show_user_headers = cs_subset_bool(wdata->sub, "compose_show_user_headers");
  if (c_compose_show_user_headers)
    rows += calc_user_hdrs(&env->userhdrs);
 
  return rows;
}

static void draw_floating(struct MuttWindow *win, int col, int row, const char *text)
{
  mutt_curses_set_normal_backed_color_by_id(MT_COLOR_COMPOSE_HEADER);
  mutt_window_move(win, row, col);
  mutt_window_printf(win, "%s", text);
  mutt_curses_set_color_by_id(MT_COLOR_NORMAL);
}

static void draw_header(struct MuttWindow *win, int row, enum HeaderField field)
{
  mutt_curses_set_normal_backed_color_by_id(MT_COLOR_COMPOSE_HEADER);
  mutt_window_move(win, row, 0);
  mutt_window_printf(win, "%*s", HeaderPadding[field], _(Prompts[field]));
  mutt_curses_set_color_by_id(MT_COLOR_NORMAL);
}

static void draw_header_content(struct MuttWindow *win, int row,
                                enum HeaderField field, const char *content)
{
  mutt_window_move(win, row, HeaderPadding[field]);
  mutt_paddstr(win, win->state.cols - HeaderPadding[field], content);
}

static int draw_crypt_lines(struct MuttWindow *win, struct EnvelopeWindowData *wdata, int row)
{
  struct Email *e = wdata->email;
 
  draw_header(win, row++, HDR_CRYPT);
 
  if ((WithCrypto & (APPLICATION_PGP | APPLICATION_SMIME)) == 0)
    return 0;
 
  // We'll probably need two lines for 'Security:' and 'Sign as:'
  int used = 2;
  if ((e->security & (SEC_ENCRYPT | SEC_SIGN)) == (SEC_ENCRYPT | SEC_SIGN))
  {
    mutt_curses_set_normal_backed_color_by_id(MT_COLOR_COMPOSE_SECURITY_BOTH);
    mutt_window_addstr(win, _("Sign, Encrypt"));
  }
  else if (e->security & SEC_ENCRYPT)
  {
    mutt_curses_set_normal_backed_color_by_id(MT_COLOR_COMPOSE_SECURITY_ENCRYPT);
    mutt_window_addstr(win, _("Encrypt"));
  }
  else if (e->security & SEC_SIGN)
  {
    mutt_curses_set_normal_backed_color_by_id(MT_COLOR_COMPOSE_SECURITY_SIGN);
    mutt_window_addstr(win, _("Sign"));
  }
  else
  {
    /* L10N: This refers to the encryption of the email, e.g. "Security: None" */
    mutt_curses_set_normal_backed_color_by_id(MT_COLOR_COMPOSE_SECURITY_NONE);
    mutt_window_addstr(win, _("None"));
    used = 1; // 'Sign as:' won't be needed
  }
  mutt_curses_set_color_by_id(MT_COLOR_NORMAL);
 
  if ((e->security & (SEC_ENCRYPT | SEC_SIGN)))
  {
    if (((WithCrypto & APPLICATION_PGP) != 0) && (e->security & APPLICATION_PGP))
    {
      if ((e->security & SEC_INLINE))
        mutt_window_addstr(win, _(" (inline PGP)"));
      else
        mutt_window_addstr(win, _(" (PGP/MIME)"));
    }
    else if (((WithCrypto & APPLICATION_SMIME) != 0) && (e->security & APPLICATION_SMIME))
    {
      mutt_window_addstr(win, _(" (S/MIME)"));
    }
  }
 
  const bool c_crypt_opportunistic_encrypt = cs_subset_bool(wdata->sub, "crypt_opportunistic_encrypt");
  if (c_crypt_opportunistic_encrypt && (e->security & SEC_OPPENCRYPT))
    mutt_window_addstr(win, _(" (OppEnc mode)"));
 
  mutt_window_clrtoeol(win);
 
  if (((WithCrypto & APPLICATION_PGP) != 0) &&
      (e->security & APPLICATION_PGP) && (e->security & SEC_SIGN))
  {
    draw_header(win, row++, HDR_CRYPTINFO);
    const char *const c_pgp_sign_as = cs_subset_string(wdata->sub, "pgp_sign_as");
    mutt_window_printf(win, "%s", c_pgp_sign_as ? c_pgp_sign_as : _("<default>"));
  }
 
  if (((WithCrypto & APPLICATION_SMIME) != 0) &&
      (e->security & APPLICATION_SMIME) && (e->security & SEC_SIGN))
  {
    draw_header(win, row++, HDR_CRYPTINFO);
    const char *const c_smime_sign_as = cs_subset_string(wdata->sub, "smime_sign_as");
    mutt_window_printf(win, "%s", c_smime_sign_as ? c_smime_sign_as : _("<default>"));
  }
 
  const char *const c_smime_encrypt_with = cs_subset_string(wdata->sub, "smime_encrypt_with");
  if (((WithCrypto & APPLICATION_SMIME) != 0) && (e->security & APPLICATION_SMIME) &&
      (e->security & SEC_ENCRYPT) && c_smime_encrypt_with)
  {
    draw_floating(win, 40, row - 1, _("Encrypt with: "));
    mutt_window_printf(win, "%s", NONULL(c_smime_encrypt_with));
  }
 
#ifdef USE_AUTOCRYPT
  const bool c_autocrypt = cs_subset_bool(wdata->sub, "autocrypt");
  if (c_autocrypt)
  {
    draw_header(win, row, HDR_AUTOCRYPT);
    if (e->security & SEC_AUTOCRYPT)
    {
      mutt_curses_set_normal_backed_color_by_id(MT_COLOR_COMPOSE_SECURITY_ENCRYPT);
      mutt_window_addstr(win, _("Encrypt"));
    }
    else
    {
      mutt_curses_set_normal_backed_color_by_id(MT_COLOR_COMPOSE_SECURITY_NONE);
      mutt_window_addstr(win, _("Off"));
    }
 
    /* L10N: The autocrypt compose menu Recommendation field.
       Displays the output of the recommendation engine
       (Off, No, Discouraged, Available, Yes) */
    draw_floating(win, 40, row, _("Recommendation: "));
    mutt_window_printf(win, "%s", _(AutocryptRecUiFlags[wdata->autocrypt_rec]));
 
    used++;
  }
#endif
  return used;
}

static int draw_envelope_addr(int field, struct AddressList *al,
                              struct MuttWindow *win, int row, size_t max_lines)
{
  draw_header(win, row, field);
 
  /* Format addresses into displayable strings and wrap across multiple
   * lines as needed, showing "(+N more)" when lines are exhausted */
  struct ListHead list = STAILQ_HEAD_INITIALIZER(list);
  int count = mutt_addrlist_count_recips(al);
 
  int lines_used = 1;
  int width_left = win->state.cols - MaxHeaderWidth;
  char more[32] = { 0 };
  int more_len = 0;
 
  struct Buffer *buf = buf_pool_get();
  bool in_group = false;
  char *sep = NULL;
  struct Address *addr = NULL;
  TAILQ_FOREACH(addr, al, entries)
  {
    struct Address *next = TAILQ_NEXT(addr, entries);
 
    if (addr->group)
    {
      in_group = true;
    }
 
    buf_reset(buf);
    mutt_addr_write(buf, addr, true);
    size_t addr_len = mutt_strwidth(buf_string(buf));
 
    sep = "";
    if (!addr->group)
    {
      // group terminator
      if (in_group && next && !next->mailbox && !next->personal)
      {
        sep = ";";
        addr_len += 1;
        in_group = false;
      }
      else if (next)
      {
        sep = ", ";
        addr_len += 2;
      }
    }
 
    count--;
  try_again:
    /* Calculate the "(+N more)" indicator width if we're on the last line */
    more_len = snprintf(more, sizeof(more),
                        ngettext("(+%d more)", "(+%d more)", count), count);
    if ((more_len < 0) || (more_len >= sizeof(more)))
      more_len = mutt_strwidth(more);
    mutt_debug(LL_DEBUG3, "text: '%s'  len: %d\n", more, more_len);
 
    int reserve = ((count > 0) && (lines_used == max_lines)) ? more_len : 0;
    mutt_debug(LL_DEBUG3, "processing: %s (al:%zu, wl:%d, r:%d, lu:%d)\n",
               buf_string(buf), addr_len, width_left, reserve, lines_used);
    if (addr_len >= (width_left - reserve))
    {
      mutt_debug(LL_DEBUG3, "not enough space\n");
      if (lines_used == max_lines)
      {
        mutt_debug(LL_DEBUG3, "no more lines\n");
        mutt_debug(LL_DEBUG3, "truncating: %s\n", buf_string(buf));
        mutt_paddstr(win, width_left, buf_string(buf));
        break;
      }
 
      if (width_left == (win->state.cols - MaxHeaderWidth))
      {
        mutt_debug(LL_DEBUG3, "couldn't print: %s\n", buf_string(buf));
        mutt_paddstr(win, width_left, buf_string(buf));
        break;
      }
 
      mutt_debug(LL_DEBUG3, "start a new line\n");
      mutt_window_clrtoeol(win);
      row++;
      lines_used++;
      width_left = win->state.cols - MaxHeaderWidth;
      mutt_window_move(win, row, MaxHeaderWidth);
      goto try_again;
    }
 
    if (addr_len < width_left)
    {
      mutt_debug(LL_DEBUG3, "space for: %s\n", buf_string(buf));
      mutt_window_addstr(win, buf_string(buf));
      mutt_window_addstr(win, sep);
      width_left -= addr_len;
    }
    mutt_debug(LL_DEBUG3, "%d addresses remaining\n", count);
    mutt_debug(LL_DEBUG3, "%zd lines remaining\n", max_lines - lines_used);
  }
  mutt_list_free(&list);
  buf_pool_release(&buf);
 
  /* Display the "(+N more)" overflow indicator, or clear the rest of the line */
  if (count > 0)
  {
    mutt_window_move(win, row, win->state.cols - more_len);
    mutt_curses_set_normal_backed_color_by_id(MT_COLOR_BOLD);
    mutt_window_addstr(win, more);
    mutt_curses_set_color_by_id(MT_COLOR_NORMAL);
    mutt_debug(LL_DEBUG3, "%d more (len %d)\n", count, more_len);
  }
  else
  {
    mutt_window_clrtoeol(win);
  }
 
  for (int i = lines_used; i < max_lines; i++)
  {
    mutt_window_move(win, row + i, 0);
    mutt_window_clrtoeol(win);
  }
 
  mutt_debug(LL_DEBUG3, "used %d lines\n", lines_used);
  return lines_used;
}

static int draw_envelope_user_hdrs(struct MuttWindow *win,
                                   struct EnvelopeWindowData *wdata, int row)
{
  const char *overflow_text = "...";
  int rows_used = 0;
 
  struct ListNode *first = STAILQ_FIRST(&wdata->email->env->userhdrs);
  if (!first)
    return rows_used;
 
  /* Draw first entry on same line as prompt */
  draw_header(win, row, HDR_CUSTOM_HEADERS);
  draw_header_content(win, row, HDR_CUSTOM_HEADERS, first->data);
  rows_used++;
 
  /* Draw any following entries on their own line */
  struct ListNode *np = STAILQ_NEXT(first, entries);
  if (!np)
    return rows_used;
 
  STAILQ_FOREACH_FROM(np, &wdata->email->env->userhdrs, entries)
  {
    if ((rows_used == (MAX_USER_HDR_ROWS - 1)) && STAILQ_NEXT(np, entries))
    {
      draw_header_content(win, row + rows_used, HDR_CUSTOM_HEADERS, overflow_text);
      rows_used++;
      break;
    }
    draw_header_content(win, row + rows_used, HDR_CUSTOM_HEADERS, np->data);
    rows_used++;
  }
  return rows_used;
}

static void draw_envelope(struct MuttWindow *win, struct EnvelopeWindowData *wdata)
{
  struct Email *e = wdata->email;
  const char *fcc = buf_string(wdata->fcc);
  const int cols = win->state.cols - MaxHeaderWidth;
 
  mutt_window_clear(win);
  int row = draw_envelope_addr(HDR_FROM, &e->env->from, win, 0, 1);
 
  if (wdata->is_news)
  {
    draw_header(win, row++, HDR_NEWSGROUPS);
    mutt_paddstr(win, cols, NONULL(e->env->newsgroups));
 
    draw_header(win, row++, HDR_FOLLOWUPTO);
    mutt_paddstr(win, cols, NONULL(e->env->followup_to));
 
    const bool c_x_comment_to = cs_subset_bool(wdata->sub, "x_comment_to");
    if (c_x_comment_to)
    {
      draw_header(win, row++, HDR_XCOMMENTTO);
      mutt_paddstr(win, cols, NONULL(e->env->x_comment_to));
    }
  }
  else
  {
    row += draw_envelope_addr(HDR_TO, &e->env->to, win, row, wdata->to_rows);
    row += draw_envelope_addr(HDR_CC, &e->env->cc, win, row, wdata->cc_rows);
    row += draw_envelope_addr(HDR_BCC, &e->env->bcc, win, row, wdata->bcc_rows);
  }
 
  draw_header(win, row++, HDR_SUBJECT);
  mutt_paddstr(win, cols, NONULL(e->env->subject));
 
  row += draw_envelope_addr(HDR_REPLYTO, &e->env->reply_to, win, row, 1);
 
  draw_header(win, row++, HDR_FCC);
  mutt_paddstr(win, cols, fcc);
 
  if (WithCrypto)
    row += draw_crypt_lines(win, wdata, row);
 
  const bool c_compose_show_user_headers = cs_subset_bool(wdata->sub, "compose_show_user_headers");
  if (c_compose_show_user_headers)
    row += draw_envelope_user_hdrs(win, wdata, row);
 
  mutt_curses_set_color_by_id(MT_COLOR_NORMAL);
}

static int env_recalc(struct MuttWindow *win)
{
  struct EnvelopeWindowData *wdata = win->wdata;
 
  const int cur_rows = win->state.rows;
  const int new_rows = calc_envelope(win, wdata);
 
  if (new_rows != cur_rows)
  {
    win->req_rows = new_rows;
    mutt_window_reflow(win->parent);
  }
 
  win->actions |= WA_REPAINT;
  mutt_debug(LL_DEBUG5, "recalc done, request WA_REPAINT\n");
  return 0;
}

static int env_repaint(struct MuttWindow *win)
{
  struct EnvelopeWindowData *wdata = win->wdata;
 
  draw_envelope(win, wdata);
  mutt_debug(LL_DEBUG5, "repaint done\n");
  return 0;
}

static int env_color_observer(struct NotifyCallback *nc)
{
  if (nc->event_type != NT_COLOR)
    return 0;
  if (!nc->global_data || !nc->event_data)
    return -1;
 
  struct EventColor *ev_c = nc->event_data;
  struct MuttWindow *win_env = nc->global_data;
 
  enum ColorId cid = ev_c->cid;
 
  switch (cid)
  {
    case MT_COLOR_BOLD:
    case MT_COLOR_COMPOSE_HEADER:
    case MT_COLOR_COMPOSE_SECURITY_BOTH:
    case MT_COLOR_COMPOSE_SECURITY_ENCRYPT:
    case MT_COLOR_COMPOSE_SECURITY_NONE:
    case MT_COLOR_COMPOSE_SECURITY_SIGN:
    case MT_COLOR_NORMAL:
    case MT_COLOR_STATUS:
    case MT_COLOR_MAX: // Sent on `uncolor *`
      mutt_debug(LL_DEBUG5, "color done, request WA_REPAINT\n");
      win_env->actions |= WA_REPAINT;
      break;
 
    default:
      break;
  }
  return 0;
}

static int env_config_observer(struct NotifyCallback *nc)
{
  if (nc->event_type != NT_CONFIG)
    return 0;
  if (!nc->global_data || !nc->event_data)
    return -1;
 
  struct EventConfig *ev_c = nc->event_data;
  if (!ev_c->name)
    return 0;
 
  struct MuttWindow *win_env = nc->global_data;
 
  switch (ev_c->name[0])
  {
    case 'a':
      if (mutt_str_equal(ev_c->name, "autocrypt"))
        break;
      return 0;
    case 'c':
      if (mutt_str_equal(ev_c->name, "compose_show_user_headers") ||
          mutt_str_equal(ev_c->name, "crypt_opportunistic_encrypt"))
      {
        break;
      }
      return 0;
    case 'p':
      if (mutt_str_equal(ev_c->name, "pgp_sign_as"))
        break;
      return 0;
    case 's':
      if (mutt_str_equal(ev_c->name, "smime_encrypt_with") ||
          mutt_str_equal(ev_c->name, "smime_sign_as"))
      {
        break;
      }
      return 0;
    case 'x':
      if (mutt_str_equal(ev_c->name, "x_comment_to"))
        break;
      return 0;
    default:
      return 0;
  }
 
  win_env->actions |= WA_RECALC;
  mutt_debug(LL_DEBUG5, "config done, request WA_RECALC\n");
  return 0;
}

static int env_email_observer(struct NotifyCallback *nc)
{
  if ((nc->event_type != NT_EMAIL) && (nc->event_type != NT_ENVELOPE))
    return 0;
  if (!nc->global_data)
    return -1;
 
  struct MuttWindow *win_env = nc->global_data;
 
  // pgp/smime/autocrypt menu, or external change
  if (nc->event_type == NT_EMAIL)
  {
    struct EnvelopeWindowData *wdata = win_env->wdata;
    update_crypt_info(wdata);
  }
 
  win_env->actions |= WA_RECALC;
  mutt_debug(LL_DEBUG5, "email done, request WA_RECALC\n");
  return 0;
}

static int env_header_observer(struct NotifyCallback *nc)
{
  if (nc->event_type != NT_HEADER)
    return 0;
  if (!nc->global_data || !nc->event_data)
    return -1;
 
  const struct EventHeader *ev_h = nc->event_data;
  struct MuttWindow *win_env = nc->global_data;
  struct EnvelopeWindowData *wdata = win_env->wdata;
 
  struct Envelope *env = wdata->email->env;
 
  if ((nc->event_subtype == NT_HEADER_ADD) || (nc->event_subtype == NT_HEADER_CHANGE))
  {
    header_set(&env->userhdrs, ev_h->header);
    mutt_debug(LL_DEBUG5, "header done, request reflow\n");
    win_env->actions |= WA_RECALC;
    return 0;
  }
 
  if (nc->event_subtype == NT_HEADER_DELETE)
  {
    struct ListNode *removed = header_find(&env->userhdrs, ev_h->header);
    if (removed)
    {
      header_free(&env->userhdrs, removed);
      mutt_debug(LL_DEBUG5, "header done, request reflow\n");
      win_env->actions |= WA_RECALC;
    }
    return 0;
  }
 
  return 0;
}

static int env_window_observer(struct NotifyCallback *nc)
{
  if (nc->event_type != NT_WINDOW)
    return 0;
  if (!nc->global_data || !nc->event_data)
    return -1;
 
  struct MuttWindow *win_env = nc->global_data;
  struct EventWindow *ev_w = nc->event_data;
  if (ev_w->win != win_env)
    return 0;
 
  if (nc->event_subtype == NT_WINDOW_STATE)
  {
    win_env->actions |= WA_RECALC;
    mutt_debug(LL_DEBUG5, "window state done, request WA_RECALC\n");
  }
  else if (nc->event_subtype == NT_WINDOW_DELETE)
  {
    struct EnvelopeWindowData *wdata = win_env->wdata;
 
    mutt_color_observer_remove(env_color_observer, win_env);
    notify_observer_remove(wdata->email->notify, env_email_observer, win_env);
    notify_observer_remove(NeoMutt->sub->notify, env_config_observer, win_env);
    notify_observer_remove(NeoMutt->notify, env_header_observer, win_env);
    notify_observer_remove(win_env->notify, env_window_observer, win_env);
    mutt_debug(LL_DEBUG5, "window delete done\n");
  }
 
  return 0;
}

struct MuttWindow *env_window_new(struct Email *e, struct Buffer *fcc, struct ConfigSubset *sub)
{
  init_header_padding();
 
  struct MuttWindow *win_env = mutt_window_new(WT_CUSTOM, MUTT_WIN_ORIENT_VERTICAL,
                                               MUTT_WIN_SIZE_FIXED, MUTT_WIN_SIZE_UNLIMITED,
                                               HDR_ATTACH_TITLE - 1);
 
  mutt_color_observer_add(env_color_observer, win_env);
  notify_observer_add(e->notify, NT_ALL, env_email_observer, win_env);
  notify_observer_add(NeoMutt->sub->notify, NT_CONFIG, env_config_observer, win_env);
  notify_observer_add(NeoMutt->notify, NT_HEADER, env_header_observer, win_env);
  notify_observer_add(win_env->notify, NT_WINDOW, env_window_observer, win_env);
 
  struct EnvelopeWindowData *wdata = env_wdata_new();
  wdata->fcc = fcc;
  wdata->email = e;
  wdata->sub = sub;
  wdata->is_news = OptNewsSend;
 
  win_env->wdata = wdata;
  win_env->wdata_free = env_wdata_free;
  win_env->recalc = env_recalc;
  win_env->repaint = env_repaint;
 
  return win_env;
}