CX("<span>%h</span></span>", zLabel);
}

enum fileedit_render_preview_flags {
FE_PREVIEW_LINE_NUMBERS = 1
};
enum fileedit_render_modes {
FE_RENDER_GUESS = 0,
FE_RENDER_PLAIN_TEXT,
FE_RENDER_HTML,
FE_RENDER_WIKI
};

static int fileedit_render_mode_for_mimetype(const char * zMimetype){
  int rc = FE_RENDER_PLAIN_TEXT;
  if( zMimetype ){

}

/*
** Performs the PREVIEW mode for /filepage.
*/
static void fileedit_render_preview(Blob * pContent,
                                    const char *zFilename,
                                    int flags, int renderMode,
                                    int nIframeHeightEm){
  const char * zMime;

  zMime = mimetype_from_name(zFilename);
  if(FE_RENDER_GUESS==renderMode){
    renderMode = fileedit_render_mode_for_mimetype(zMime);
  }
  CX("<div class='fileedit-preview'>");
  CX("<div>Preview</div>");
  switch(renderMode){
    case FE_RENDER_HTML:{
      char * z64 = encode64(blob_str(pContent), blob_size(pContent));
      CX("<iframe width='100%%' frameborder='0' marginwidth='0' "
         "style='height:%dem' "
         "marginheight='0' sandbox='allow-same-origin' id='ifm1' "
         "src='data:text/html;base64,%z'"
         "></iframe>", nIframeHeightEm ? nIframeHeightEm : 40,
         z64);
      break;
    }
    case FE_RENDER_WIKI:
      wiki_render_by_mimetype(pContent, zMime);
      break;

    default:{
      const char *zExt = strrchr(zFilename,'.');
      const char *zContent = blob_str(pContent);
      if(FE_PREVIEW_LINE_NUMBERS & flags){
        output_text_with_line_numbers(zContent, "on");
      }else if(zExt && zExt[1]){
        CX("<pre><code class='language-%s'>%h</code></pre>",

  const char * zFileMime = 0;           /* File mime type guess */
  CheckinMiniInfo cimi;                 /* Checkin state */
  int submitMode = SUBMIT_NONE;         /* See mapping below */
  int vid, newVid = 0;                  /* checkin rid */
  int frid = 0;                         /* File content rid */
  int previewLn = P("preview_ln")!=0;   /* Line number mode */
  int previewHtmlHeight = 0;            /* iframe height (EMs) */
  int previewRenderMode = FE_RENDER_GUESS; /* preview mode */
  char * zFileUuid = 0;                 /* File content UUID */
  Blob err = empty_blob;                /* Error report */
  const char * zFlagCheck = 0;          /* Temp url flag holder */
  Blob endScript = empty_blob;          /* Script code to run at the
                                           end. This content will be
                                           combined into a single JS
                                           function call, thus each

  CX("<button type='submit' name='submit' value='1'>"
     "Save</button>");
  CX("<button type='submit' name='submit' value='2'>"
     "Preview</button>");
  CX("<button type='submit' name='submit' value='3'>"
     "Diff (TODO)</button>");
  {

    /* Preview rendering mode selection... */
    previewRenderMode = atoi(PD("preview_render_mode","0"));
    if(0==previewRenderMode){
      previewRenderMode = fileedit_render_mode_for_mimetype(zFileMime);
    }
    CX("<br>");
    CX("<select name='preview_render_mode'>\n");
    CX("<option value='%d' disabled>Preview Mode</option>",
       FE_RENDER_GUESS);
    CX("<option value='%d'%s>Guess</option>",
       FE_RENDER_GUESS,
       FE_RENDER_GUESS==previewRenderMode ? " selected" : "");
    CX("<option value='%d'%s>Wiki/Markdown</option>",
       FE_RENDER_WIKI,
       FE_RENDER_WIKI==previewRenderMode ? " selected" : "");
    CX("<option value='%d'%s>HTML (iframe)</option>",
       FE_RENDER_HTML,
       FE_RENDER_HTML==previewRenderMode ? " selected" : "");
    CX("<option value='%d'%s>Plain Text</option>",
       FE_RENDER_PLAIN_TEXT,
       FE_RENDER_PLAIN_TEXT==previewRenderMode ? " selected" : "");
    CX("</select>\n");
    if(FE_RENDER_HTML==previewRenderMode){
      /* HTML preview mode iframe height... */
      int i;
      if(submitMode==SUBMIT_PREVIEW){
        previewHtmlHeight = atoi(PD("preview_html_ems","0"));
      }else{
        previewHtmlHeight = 40;
      }
      /* Allow selection of HTML preview iframe height */
      CX("<select name='preview_html_ems' "
         "title='Height (in EMs) of the iframe used for HTML "
         "preview.'>\n");
      CX("<option disabled value='40'>HTML Preview Height (EMs)"
         "</option>\n");
      for( i = 20; i <= 100; i+=20 ){
        CX("<option value='%d'%s>%d</option>\n",
           i, (previewHtmlHeight==i) ? " selected" : "", i);
      }
      CX("</select>\n");
    }
    else if(FE_RENDER_PLAIN_TEXT==previewRenderMode){
      style_labeled_checkbox("preview_ln",
                             "Add line numbers to plain-text previews?",
                             "1",
                             "If on, plain-text files (only) will get "
                             "line numbers added to the preview.",
                             previewLn);
    }

    ** be emitted below. */
    cimi.pMfOut = 0;
    blob_reset(&manifest);
  }else if(SUBMIT_PREVIEW==submitMode){
    int pflags = 0;
    if(previewLn) pflags |= FE_PREVIEW_LINE_NUMBERS;
    fileedit_render_preview(&cimi.fileContent, cimi.zFilename, pflags,
                            previewRenderMode, previewHtmlHeight);
  }else if(SUBMIT_DIFF==submitMode/*diff*/){
    fail((&err,"Diff mode is still TODO."));
  }else{
    /* Ignore invalid submitMode value */
    goto end_footer;
  }