** a reply.
*/
struct ForumPost {
  int fpid;              /* rid for this post */
  int sid;               /* Serial ID number */
  int rev;               /* Revision number */
  char *zUuid;           /* Artifact hash */
  char *zDisplayName;    /* Name of user who wrote this post */
  double rDate;          /* Date for this post */
  ForumPost *pIrt;       /* This post replies to pIrt */
  ForumPost *pEditHead;  /* Original, unedited post */
  ForumPost *pEditTail;  /* Most recent edit for this post */
  ForumPost *pEditNext;  /* This post is edited by pEditNext */
  ForumPost *pEditPrev;  /* This post is an edit of pEditPrev */
  ForumPost *pNext;      /* Next in chronological order */
  ForumPost *pPrev;      /* Previous in chronological order */

** Delete a complete ForumThread and all its entries.
*/
static void forumthread_delete(ForumThread *pThread){
  ForumPost *pPost, *pNext;
  for(pPost=pThread->pFirst; pPost; pPost = pNext){
    pNext = pPost->pNext;
    fossil_free(pPost->zUuid);
    fossil_free(pPost->zDisplayName);
    fossil_free(pPost);
  }
  fossil_free(pThread);
}

/*
** Search a ForumPost list forwards looking for the post with fpid

  ForumPost *p;
  Stmt q;
  int sid = 1;
  int firt, fprev;
  pThread = fossil_malloc( sizeof(*pThread) );
  memset(pThread, 0, sizeof(*pThread));
  db_prepare(&q,
     "SELECT fpid, firt, fprev, (SELECT uuid FROM blob WHERE rid=fpid)"
     "SELECT fpid, firt, fprev, (SELECT uuid FROM blob WHERE rid=fpid), fmtime"
     "  FROM forumpost"
     " WHERE froot=%d ORDER BY fmtime",
     froot
  );
  while( db_step(&q)==SQLITE_ROW ){
    pPost = fossil_malloc( sizeof(*pPost) );
    memset(pPost, 0, sizeof(*pPost));
    pPost->fpid = db_column_int(&q, 0);
    firt = db_column_int(&q, 1);
    fprev = db_column_int(&q, 2);
    pPost->zUuid = fossil_strdup(db_column_text(&q,3));
    pPost->rDate = db_column_double(&q,4);
    if( !fprev ) pPost->sid = sid++;
    pPost->pPrev = pThread->pLast;
    pPost->pNext = 0;
    if( pThread->pLast==0 ){
      pThread->pFirst = pPost;
    }else{
      pThread->pLast->pNext = pPost;

** field to see if it has display-name followed by an email address.
** If it does, that becomes the new display name.  If not, let the display
** name just be the login.
**
** Space to hold the returned name is obtained from fossil_strdup() or
** mprintf() and should be freed by the caller.
*/
char *display_name_from_login(const char *zLogin){
static char *display_name_from_login(const char *zLogin){
  static Stmt q;
  char *zResult;
  db_static_prepare(&q,
     "SELECT display_name(info) FROM user WHERE login=$login"
  );
  db_bind_text(&q, "$login", zLogin);
  if( db_step(&q)==SQLITE_ROW && db_column_type(&q,0)==SQLITE_TEXT ){
    const char *zDisplay = db_column_text(&q,0);
    if( fossil_strcmp(zDisplay,zLogin)==0 ){
      zResult = fossil_strdup(zLogin);
    }else{
      zResult = mprintf("%s (%s)", zDisplay, zLogin);
    }
  }else{
    zResult = fossil_strdup(zLogin);
  }
  db_reset(&q);
  return zResult;
}

/*
** Compute and return the display name for a ForumPost.  If
** pManifest is not NULL, then it is a Manifest object for the post.
** if pManifest is NULL, this routine has to fetch and parse the
** Manifest object for itself.
**
** Memory to hold the display name is attached to p->zDisplayName
** and will be freed together with the ForumPost object p when it
** is freed.
*/
static char *forum_post_display_name(ForumPost *p, Manifest *pManifest){
  Manifest *pToFree = 0;
  if( p->zDisplayName ) return p->zDisplayName;
  if( pManifest==0 ){
    pManifest = pToFree = manifest_get(p->fpid, CFTYPE_FORUM, 0);
    if( pManifest==0 ) return "(unknown)";
  }
  p->zDisplayName = display_name_from_login(pManifest->zUser);
  if( pToFree ) manifest_destroy(pToFree);
  if( p->zDisplayName==0 ) return "(unknown)";
  return p->zDisplayName;
}


/*
** Display a single post in a forum thread.
*/
static void forum_display_post(
  ForumPost *p,         /* Forum post to display */
  int iIndentScale,     /* Indent scale factor */
  int bRaw,             /* True to omit the border */
  int bUnf,             /* True to leave the post unformatted */
  int bHist,            /* True if showing edit history */
  int bSelect,          /* True if this is the selected post */
  char *zQuery          /* Common query string */
){
  char *zDisplayName;   /* The display name */
  char *zPosterName;    /* Name of user who originally made this post */
  char *zEditorName;    /* Name of user who provided the current edit */
  char *zDate;          /* The time/date string */
  char *zHist;          /* History query string */
  Manifest *pOriginal;  /* Original post artifact */
  Manifest *pManifest;  /* Manifest comprising the current post */
  Manifest *pRevised;   /* Revised post artifact (may be same as pOriginal) */
  int bPrivate;         /* True for posts awaiting moderation */
  int bSameUser;        /* True if author is also the reader */
  int iIndent;          /* Indent level */
  const char *zMimetype;/* Formatting MIME type */

  /* Get the original and revised artifacts for the post.  Abort if either is
  ** not found (e.g. shunned). */
  /* Get the manifest for the post.  Abort if not found (e.g. shunned). */
  if( p->pEditHead ){
    pOriginal = manifest_get(p->pEditHead->fpid, CFTYPE_FORUM, 0);
    pRevised = manifest_get(p->fpid, CFTYPE_FORUM, 0);
  pManifest = manifest_get(p->fpid, CFTYPE_FORUM, 0);
  }else{
    pOriginal = pRevised = manifest_get(p->fpid, CFTYPE_FORUM, 0);
  }
  if( !pOriginal || !pRevised ) return;
  if( !pManifest ) return;

  /* When not in raw mode, create the border around the post. */
  if( !bRaw ){
    /* Open the <div> enclosing the post.  Set the class string to mark the post
    ** as selected and/or obsolete. */
    iIndent = (p->pEditHead ? p->pEditHead->nIndent : p->nIndent)-1;
    @ <div id='forum%d(p->fpid)' class='forumTime\
    @ %s(bSelect ? " forumSel" : "")\
    @ %s(p->pEditTail ? " forumObs" : "")'\
    if( iIndent && iIndentScale ){
      @ style='margin-left: %d(iIndent*iIndentScale)ex'
    }
    @ >

    /* If this is the first post (or an edit thereof), emit the thread title. */
    if( pRevised->zThreadTitle ){
      @ <h1>%h(pRevised->zThreadTitle)</h1>
    if( pManifest->zThreadTitle ){
      @ <h1>%h(pManifest->zThreadTitle)</h1>
    }

    /* Emit the serial number, revision number, author, and date. */
    zDisplayName = display_name_from_login(pOriginal->zUser);
    zDate = db_text(0, "SELECT datetime(%.17g)", pOriginal->rDate);
    @ <h3 class='forumPostHdr'>(%d(p->sid)\
    if( p->nEdit ){
      @ .%.*d(fossil_num_digits(p->nEdit))(p->rev)\
    }
    @ ) By %h(zDisplayName) on %h(zDate)
    fossil_free(zDisplayName);
    fossil_free(zDate);
    /* Begin emitting the header line.  The forum of the title
    ** varies depending on whether:
    **    *  The post is uneditted
    **    *  The post was last editted by the original author
    **    *  The post was last editted by a different person
    */
    if( p->pEditHead ){
      zDate = db_text(0, "SELECT datetime(%.17g)", p->pEditHead->rDate);
    }else{
      zPosterName = forum_post_display_name(p, pManifest);
      zEditorName = zPosterName;
    }
    zDate = db_text(0, "SELECT datetime(%.17g)", p->rDate);
    if( p->pEditPrev ){
      zPosterName = forum_post_display_name(p->pEditHead, 0);
      zEditorName = forum_post_display_name(p, pManifest);
      zHist = bHist ? "" : "&hist";
      @ <h3 class='forumPostHdr'>(%d(p->sid)\
      @ .%0*d(fossil_num_digits(p->nEdit))(p->rev)) \
      if( fossil_strcmp(zPosterName, zEditorName)==0 ){
        @ By %h(zPosterName) on %h(zDate) editted from \
        @ %z(href("%R/forumpost/%S?%s%s",p->pEditPrev->zUuid,zQuery,zHist))\
        @ %d(p->sid).%0*d(fossil_num_digits(p->nEdit))(p->pEditPrev->rev)</a>
      }else{
        @ Originally by %h(zPosterName) \
        @ with edits by %h(zEditorName) on %h(zDate) from \
        @ %z(href("%R/forumpost/%S?%s%s",p->pEditPrev->zUuid,zQuery,zHist))\
        @ %d(p->sid).%0*d(fossil_num_digits(p->nEdit))(p->pEditPrev->rev)</a>
      }
    }else{
      zPosterName = forum_post_display_name(p, pManifest);
      @ <h3 class='forumPostHdr'>(%d(p->sid)) \
      @ By %h(zPosterName) on %h(zDate)
    }
    fossil_free(zDate);


    /* If debugging is enabled, link to the artifact page. */
    if( g.perm.Debug ){
      @ <span class="debug">\
      @ <a href="%R/artifact/%h(p->zUuid)">(artifact-%d(p->fpid))</a></span>
    }

    /* If this is an edit, refer back to the old version.  Be sure "hist" is in
    ** the query string so the old version will actually be shown. */
    if( p->pEditPrev ){
      zHist = bHist ? "" : "&hist";
      @ edit of \
      @ %z(href("%R/forumpost/%S?%s%s",p->pEditPrev->zUuid,zQuery,zHist))\
      @ %d(p->sid).%.*d(fossil_num_digits(p->nEdit))(p->pEditPrev->rev)</a>
    }

    /* If this is a reply, refer back to the parent post. */
    if( p->pIrt ){
      @ in reply to %z(href("%R/forumpost/%S?%s",p->pIrt->zUuid,zQuery))\
      @ %d(p->pIrt->sid)\
      if( p->pIrt->nEdit ){
        @ .%.*d(fossil_num_digits(p->pIrt->nEdit))(p->pIrt->rev)\
        @ .%0*d(fossil_num_digits(p->pIrt->nEdit))(p->pIrt->rev)\
      }
      @ </a>
    }

    /* If this post was later edited, refer forward to the next edit. */
    if( p->pEditNext ){
      @ updated by %z(href("%R/forumpost/%S?%s",p->pEditNext->zUuid,zQuery))\
      @ %d(p->pEditNext->sid)\
      @ .%.*d(fossil_num_digits(p->nEdit))(p->pEditNext->rev)</a>
      @ .%0*d(fossil_num_digits(p->nEdit))(p->pEditNext->rev)</a>
    }

    /* Provide a link to select the individual post. */
    if( !bSelect ){
      @ %z(href("%R/forumpost/%S?%s",p->zUuid,zQuery))[link]</a>
    }

    /* Provide a link to the raw source code. */
    if( !bUnf ){
      @ %z(href("%R/forumpost/%S?raw",p->zUuid))[source]</a>
    }

    /* If this is an edit, identify the editor and date. */
    if( p->pEditPrev ){
      zDisplayName = display_name_from_login(pRevised->zUser);
      zDate = db_text(0, "SELECT datetime(%.17g)", pRevised->rDate);
      @ <br>Edited by %h(zDisplayName) on %h(zDate)
      fossil_free(zDisplayName);
      fossil_free(zDate);
    }
    @ </h3>
  }

  /* Check if this post is approved, also if it's by the current user. */
  bPrivate = content_is_private(p->fpid);
  bSameUser = login_is_individual()
           && fossil_strcmp(pOriginal->zUser, g.zLogin)==0;
           && fossil_strcmp(pManifest->zUser, g.zLogin)==0;

  /* Render the post if the user is able to see it. */
  if( bPrivate && !g.perm.ModForum && !bSameUser ){
    @ <p><span class="modpending">Awaiting Moderator Approval</span></p>
  }else{
    if( bRaw || bUnf || p->pEditTail ){
      zMimetype = "text/plain";
    }else{
      zMimetype = pRevised->zMimetype;
      zMimetype = pManifest->zMimetype;
    }
    forum_render(0, zMimetype, pRevised->zWiki, 0, !bRaw);
    forum_render(0, zMimetype, pManifest->zWiki, 0, !bRaw);
  }

  /* When not in raw mode, finish creating the border around the post. */
  if( !bRaw ){
    /* If the user is able to write to the forum and if this post has not been
    ** edited, create a form with various interaction buttons. */
    if( g.perm.WrForum && !p->pEditTail ){

        }
      }else if( g.perm.ModForum ){
        /* Allow moderators to approve or reject pending posts.  Also allow
        ** forum supervisors to mark non-special users as trusted and therefore
        ** able to post unmoderated. */
        @ <input type="submit" name="approve" value="Approve">
        @ <input type="submit" name="reject" value="Reject">
        if( g.perm.AdminForum && !login_is_special(pOriginal->zUser) ){
        if( g.perm.AdminForum && !login_is_special(pManifest->zUser) ){
          @ <br><label><input type="checkbox" name="trust">
          @ Trust user "%h(pOriginal->zUser)" so that future posts by \
          @ "%h(pOriginal->zUser)" do not require moderation.
          @ Trust user "%h(pManifest->zUser)" so that future posts by \
          @ "%h(pManifest->zUser)" do not require moderation.
          @ </label>
          @ <input type="hidden" name="trustuser" value="%h(pOriginal->zUser)">
          @ <input type="hidden" name="trustuser" value="%h(pManifest->zUser)">
        }
      }else if( bSameUser ){
        /* Allow users to delete (reject) their own pending posts. */
        @ <input type="submit" name="reject" value="Delete">
      }
      @ </form></div>
    }
    @ </div>
  }

  /* Clean up. */
  if( pRevised!=pOriginal ) manifest_destroy(pRevised);
  manifest_destroy(pOriginal);
  manifest_destroy(pManifest);
}

/*
** Possible display modes for forum_display_thread().
*/
enum {
  FD_RAW,     /* Like FD_SINGLE, but additionally omit the border, force