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% These routines user 'user_marks' to implement book marks. A book mark
% may be placed in any buffer and returning to the mark may cause a change
% of buffer.
% The only functions that are considered external are 'bkmrk_set_mark'
% and 'bkmrk_goto_mark'. These functions prompt for a a key '0' - '9'
% or a SPACE.
variable Book_Marks = Mark_Type [10];
variable Bkmrk_Last_Position = NULL;
define bkmrk_get_or_set_mark (get)
{
variable n;
variable prompt;
variable m;
if ((Bkmrk_Last_Position != NULL) and get)
get = 2;
prompt = "Bookmark number:";
if (get == 2)
prompt = "Bookmark number or SPACE for last position:";
flush (prompt);
n = getkey ();
if ((get == 2) and (n == ' '))
return Bkmrk_Last_Position;
n -= '0';
if ((n < 0) or (n > 9)) error ("Number must be less than 10");
if (get)
return Book_Marks[n];
Book_Marks[n] = create_user_mark ();
vmessage ("Bookmark %d set.", n);
}
define bkmrk_set_mark ()
{
bkmrk_get_or_set_mark (0);
}
define bkmrk_goto_mark ()
{
variable mrk = bkmrk_get_or_set_mark (1);
if (mrk == NULL)
error ("Bookmark has not been set");
Bkmrk_Last_Position = create_user_mark ();
sw2buf (user_mark_buffer (mrk));
!if (is_user_mark_in_narrow (mrk))
{
#ifdef HAS_BLOCAL_VAR
variable fun;
ERROR_BLOCK
{
_clear_error ();
error ("Mark lies outside visible part of buffer.");
}
fun = get_blocal_var ("bookmark_narrow_hook");
mrk; eval (fun);
#else
error ("Mark lies outside visible part of buffer.");
#endif
}
goto_user_mark (mrk);
message ("done");
}
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