components/editor/vim/patches/help.patch

   1 --- vim-8.2.1897/src/help.c     2020-10-24 17:19:16.000000000 +0000
   2 +++ vim-8.2.1897/src/help.c     2020-10-24 18:42:52.206685850 +0000
   3 @@ -38,6 +38,8 @@ ex_help(exarg_T *eap)
   4  #ifdef FEAT_FOLDING
   5      int                old_KeyTyped = KeyTyped;
   6  #endif
   7 +    int                nohelp = FALSE, nominhelp = FALSE;
   8 +    char_u     *mhf = NULL;
   9
  10      if (ERROR_IF_ANY_POPUP_WINDOW)
  11         return;
  12 @@ -88,6 +90,23 @@ ex_help(exarg_T *eap)
  13      n = find_help_tags(arg, &num_matches, &matches,
  14                                                  eap != NULL && eap->forceit);
  15
  16 +    /*
  17 +     * If we didn't find the help topic, check to see whether 'helpfile'
  18 +     * (typically $VIMRUNTIME/doc/help.txt) exists.  If not, then we'll send the
  19 +     * user to the minimized help file delivered with the core vim package which
  20 +     * explains why there's no help and how to get it.
  21 +     */
  22 +    if (num_matches == 0 && mch_access((char *)p_hf, F_OK) < 0) {
  23 +       nohelp = TRUE;
  24 +       mhf = alloc(MAXPATHL);
  25 +       STRNCPY(mhf, p_hf, MAXPATHL - 1);
  26 +       mhf[STRLEN(mhf) - 8] = '\0';
  27 +       STRNCAT(mhf, "help_minimized.txt", MAXPATHL - STRLEN(mhf) - 1);
  28 +
  29 +       if (mch_access((char *)mhf, F_OK) < 0)
  30 +           nominhelp = TRUE;
  31 +    }
  32 +
  33      i = 0;
  34  #ifdef FEAT_MULTI_LANG
  35      if (n != FAIL && lang != NULL)
  36 @@ -100,7 +119,7 @@ ex_help(exarg_T *eap)
  37                 break;
  38         }
  39  #endif
  40 -    if (i >= num_matches || n == FAIL)
  41 +    if (!nohelp && i >= num_matches || n == FAIL)
  42      {
  43  #ifdef FEAT_MULTI_LANG
  44         if (lang != NULL)
  45 @@ -113,9 +132,11 @@ ex_help(exarg_T *eap)
  46         return;
  47      }
  48
  49 -    // The first match (in the requested language) is the best match.
  50 -    tag = vim_strsave(matches[i]);
  51 -    FreeWild(num_matches, matches);
  52 +    if (!nohelp) {
  53 +       /* The first match (in the requested language) is the best match. */
  54 +       tag = vim_strsave(matches[i]);
  55 +       FreeWild(num_matches, matches);
  56 +    }
  57
  58  #ifdef FEAT_GUI
  59      need_mouse_correct = TRUE;
  60 @@ -137,12 +158,14 @@ ex_help(exarg_T *eap)
  61         {
  62             // There is no help window yet.
  63             // Try to open the file specified by the "helpfile" option.
  64 -           if ((helpfd = mch_fopen((char *)p_hf, READBIN)) == NULL)
  65 -           {
  66 -               smsg(_("Sorry, help file \"%s\" not found"), p_hf);
  67 -               goto erret;
  68 +           if (!nohelp || nominhelp) {
  69 +               if ((helpfd = mch_fopen((char *)p_hf, READBIN)) == NULL)
  70 +               {
  71 +                   smsg((char_u *)_("Sorry, help file \"%s\" not found"), p_hf);
  72 +                   goto erret;
  73 +               }
  74 +               fclose(helpfd);
  75             }
  76 -           fclose(helpfd);
  77
  78             // Split off help window; put it at far top if no position
  79             // specified, the current window is vertically split and
  80 @@ -161,7 +184,7 @@ ex_help(exarg_T *eap)
  81             // set b_p_ro flag).
  82             // Set the alternate file to the previously edited file.
  83             alt_fnum = curbuf->b_fnum;
  84 -           (void)do_ecmd(0, NULL, NULL, NULL, ECMD_LASTL,
  85 +           (void)do_ecmd(0, mhf, NULL, NULL, ECMD_LASTL,
  86                           ECMD_HIDE + ECMD_SET_HELP,
  87                           NULL);  // buffer is still open, don't store info
  88             if (!cmdmod.keepalt)
  89 @@ -179,7 +202,7 @@ ex_help(exarg_T *eap)
  90      KeyTyped = old_KeyTyped;
  91  #endif
  92
  93 -    if (tag != NULL)
  94 +    if (!nohelp && tag != NULL)
  95         do_tag(tag, DT_HELP, 1, FALSE, TRUE);
  96
  97      // Delete the empty buffer if we're not using it.  Careful: autocommands
  98 @@ -197,7 +220,8 @@ ex_help(exarg_T *eap)
  99         curwin->w_alt_fnum = alt_fnum;
 100
 101  erret:
 102 -    vim_free(tag);
 103 +    if (!nohelp)
 104 +       vim_free(tag);
 105  }
 106
 107  /*