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Edit File: TO-DO
------------------------------------------------------------------------------- -- Copyright 2020 Thomas E. Dickey -- -- Copyright 1998-2010,2011 Free Software Foundation, Inc. -- -- -- -- Permission is hereby granted, free of charge, to any person obtaining a -- -- copy of this software and associated documentation files (the -- -- "Software"), to deal in the Software without restriction, including -- -- without limitation the rights to use, copy, modify, merge, publish, -- -- distribute, distribute with modifications, sublicense, and/or sell copies -- -- of the Software, and to permit persons to whom the Software is furnished -- -- to do so, subject to the following conditions: -- -- -- -- The above copyright notice and this permission notice shall be included -- -- in all copies or substantial portions of the Software. -- -- -- -- THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS -- -- OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF -- -- MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN -- -- NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, -- -- DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR -- -- OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE -- -- USE OR OTHER DEALINGS IN THE SOFTWARE. -- -- -- -- Except as contained in this notice, the name(s) of the above copyright -- -- holders shall not be used in advertising or otherwise to promote the -- -- sale, use or other dealings in this Software without prior written -- -- authorization. -- ------------------------------------------------------------------------------- -- $Id: TO-DO,v 1.58 2020/02/02 23:34:34 tom Exp $ ------------------------------------------------------------------------------- SHORT-TERM TO-DO ITEMS: Known Problems: + libtool does not work with GNAT. + The screen optimization has been tested only in an ad hoc manner. We should develop a good set of regression tests to cover lib_doupdate.c and lib_mvcur.c. + Magic cookie support (for nonzero xmc values) does not work, since the logic does not take into account refresh. Also, the initial optimize does not adjust the current location when a cookie is emitted. + Scrolling optimization has holes: for example, it forces repaints of the screen between calls to refresh(). + SVr4 uses slightly different rules for determining when softkeys are shown. For example, they are initially displayed (before the ncurses 'e' test activates them), and a touchwin can apparently also force them to be displayed. + The code departs from perfect 8-bit cleanness in one respect; you cannot specify a character \200 as part of a capability string, because the terminfo library interprets \200 as a request to embed NUL (\000) at that point. This is a legacy terminfo property we can't mess with. + The window classes defined in the c++ subdirectory need documentation. Some C++ programmer could earn a lot of good karma by doing this... + vid_attr() should support the set_a_attributes (sgr1) string, but does not. There appear to be no terminals that require that functionality. + the configure --disable-ext-funcs option does not work for Ada95 tree. + the --with-pthread configuration builds for Cygwin, but does not work properly (test/worm.c shows all of the worms in the same location). + the --enable-rpath configure option builds for the corresponding platforms; however combining it with --with-ticlib and --with-termlib does not always produce libraries that can be run without setting environment variables. Building those with libtool does not work either. (This is a problem with the BSD platforms). + more work is needed to make the MinGW port support ordinary terminals. Portability (or lack thereof): + Users of older System V UNIXes (but not Solaris, and probably not SVr4) may trip over a known problem with the signal-handling code which causes abrupt termination of ncurses applications following resume from a ^Z suspend (this problem was first seen running lynx). You will not see this problem if you are using one of the 4.4BSD derivatives like such as, NetBSD, or BSDI, or systems using that convention. For details, see the analysis in the header comment of ncurses/tty/lib_tstp.c . + In theory, vwprintw and vwscanf are supposed to use the older varargs.h interface for handling variadic argument lists (and are deprecated by X/Open for that reason). Many newer systems do no have varargs.h, instead they have only the newer X/Open-standard stdargs.h equivalent. So these functions use stdargs instead. This is unlikely to be a problem unless you're building ncurses on a System V old enough to only have varargs.h. (Solaris 2.5.1 used the stdarg.h binding as well). + If you're using a system old enough not to have a native vsscanf(3) in its library, vwscanw() will not work. If you want to fix this, add an implementation to ncurses/vsscanf.c. + The C++ binding fails to build with a few C++ compilers. + terminfo.5 does not format with the SunOS (and most other platform's) tbl utility because it relies on a diversion for each table entry. Get the groff package. Untested features: + The code for the HP color model using set_color_pair is untested. + The code for handling soft labels on a terminal type with built-in support for them (num_labels > 0, label_height, label_width, label_format, label_off, label_on, plab_norm, lab_f*) has not been tested. The label_format and lab_f* capabilities aren't presently used. LONGER-TERM TO-DO ITEMS: 1. Extended COSE conformance There is an XPG4 standard released in 1996 which describes a superset of the SVr4 API. The library is BASE conformant with this standard. We would like to make ncurses fully conformant at the EXTENDED level supporting internationalization. 2. DOS port Only a few of the files in the library depend on the terminfo format. It should be possible to further kernelize the package, then rewrite a small number of core files to produce a functionally-compatible port that would do updates to a memory-mapped screen area. The first result of this would be a DOS port. 3. X port It would be nice if ncurses could recognize when it was running under X and maintain its own window. With this feature, all ncurses programs would automatically become X programs. The challenge is to handle resize events properly. 4. Unused capabilities The currently unused capabilities fall naturally into several groups: A. Status-line capabilities: Booleans: has_status_line, status_line_esc_ok. Numerics: width_status_line. Strings: dis_status_line, from_status_line, to_status_line. System V Release 1 curses made no use of these at all. SVr4's use, if any, is unknown. From the AT&T termcap file it looks like curses, in general, shouldn't use them; terminal variants with status lines have their line count decremented by 1, suggesting that curses is supposed to leave the status line alone. B. Printer capabilities: Boolean: col_addr_glitch, cr_cancels_micro_mode, has_print_wheel, row_addr_glitch, semi_auto_right_margin, cpi_changes_res, lpi_changes_res. Numeric: buffer_capacity, dot_horz_spacing, dot_vert_spacing, max_micro_address, max_micro_jump, micro_col_size, micro_line_size, number_of_pins, output_res_char, output_res_line, output_res_horz_inch, print_rate, wide_char_size, bit_image_entwining, bit_image_type. String: down_half_line, form_feed, up_half_line, set_left_margin, set_right_margin, clear_margins, change_char_pitch ... set_page_length (all the SVr4 printer caps), Curses doesn't use these. C. Printer-control capabilities: Boolean: prtr_silent. Strings: print_screen, prtr_on, prtr_off, prtr_non. Curses doesn't use these. D. Dialer strings: Strings: hangup, dial_phone, quick_dial, tone, pulse, flash_hook, fixed_pause, wait_tone. Curses doesn't use these. E. Window and virtual-terminal capabilities: Numerics: maximum_windows, virtual_terminal. Strings: req_for_input, create_window, goto_window, set_window. These seem to be fossils from some AT&T experiments on character-based window systems that never escaped the lab. The virtual_terminal cap had something to do with building terminal emulations into tty line disciplines. F. Unused VDT capabilities: Booleans: erase_overstrike, has_meta_key, insert_null_glitch, move_insert, dest_tabs_magic_smso, transparent_underline, needs_xon_xoff, hard_cursor. Numerics: lines_of_memory, buttons. Strings: pkey_key, pkey_local, pkey_xmit, underline_char, enter_xon_mode, exit_xon_mode, xon_character, xoff_character, display_clock, remove_clock, user[0-5], display_pc_char, enter_scancode_mode, exit_scancode_mode, pc_term_options, scancode_escape, alt_scancode_esc. These are the potentially important ones for ncurses. Notes: i) ncurses doesn't need move_insert; it never uses cup/hpa/vpa while insert_mode is on. ii) We probably don't care about dest_tabs_magic_smso; only Telerays used it and they're all long obsolete. -- vile:txtmode