notcurses/NEWS.md

This document attempts to list user-visible changes and any major internal rearrangements of Notcurses.

• 2.3.3 (not yet released)

  • Added the flag NCVISUAL_OPTION_NOINTERPOLATE to use non-interpolative scaling in ncvisual_render(). ncvisual_render() without a multimedia engine will now use this method for any requested scaling (previously, scaling was not performed without a linked multimedia backend).
  • NCVISUAL_OPTION_BLEND used with NCBLIT_PIXEL will now, when the Kitty graphics protocol is in use, cut the alpha of each pixel in half.
  • ncvisual_inflate() has been rewritten as a wrapper around the new function ncvisual_resize_noninterpolative(), and deprecated. It will be removed for ABI3. Godspeed, ncvisual_inflate(); we hardly knew ye.
  • ncdirect_renderf() has been changed to accept a ncvisual_options, replacing and extending its four final arguments. Sorry about the breakage here, but ncdirect_renderf() was introduced pretty recently (2.3.1). As a result, ncdirect_renderf() and ncdirect_stream() now honor NCVISUAL_OPTION_BLEND and NCVISUAL_OPTION_NOINTERPOLATE. All of this also applies to ncdirect_geomf().
  • ncplayer now accepts -n to force non-interpolative scaling.
  • A new binary is installed, notcurses-info. It prints information about the terminal environment in which it runs. More information is available from its man page, notcurses-info(1).
  • Added ncdirect_light_box(), ncdirect_heavy_box(), nccells_light_box(), and nccells_heavy_box(). Publicized nccells_ascii_box(). All are static inline.
  • A bug was fixed in ncplane_move_yx(): root planes were being moved relatively instead of absolutely. This was never the intended behavior.
  • It used to be possible to pass NULL as the second parameter of ncplane_mergedown_simple(), and have the standard plane be used as the destination. This is no longer supported, since the source plane could be in another pile. An error will instead be returned.
  • Fixed a bug in ncdirect_box() where default/palette-indexed colors weren't properly used on the top and bottom borders.
  • Added notcurses_detected_terminal() and ncdirect_detected_terminal().

• 2.3.2 (2021-06-03)

  • Fixed a bug affecting certain scalings of ncvisual objects created from memory (e.g. ncvisual_from_rgba()).
  • Fixed a bug where setting a style in direct mode reset color. Shocked that such a bug could exist for so long, ugh.
  • Fixed memory leaks in the ffmpeg and none implementations of the ncvisual API, and also the libnotcurses-core implementation.
  • ncinput_nomod_p() has been added. This function returns true if and only if its ncinput argument has no modifiers active.
  • Added notcurses_cursor_yx() to get the current location of the cursor.
  • Added ncdirect_supported_styles().
  • ncplane_at_yx() now properly integrates the plane's base cell when appropriate, and thus represents the cell as it will be used during rendering. This change cascades, affecting e.g. ncplane_contents().
  • ncplane_at_yx() now returns the EGC when called on any column of a wide glyph. ncplane_at_yx_cell() continues to duplicate the exact nccell, and can thus continue to be used to distinguish between primary and secondary columns of a wide glyph. Likewise, notcurses_at_yx() now returns the EGC when called on any column of a wide glyph.
  • Sadly, ncplane_contents() no longer accepts a const ncplane*, since it might write temporaries to the plane's EGCpool during operation.
  • Added ncdirect_styles(), to retrieve the current styling.
  • In previous versions of Notcurses, a rendered-mode context (struct notcurses) and a direct-mode context (struct ncdirect) could be open at the same time. This was never intended, and is no longer possible.

• 2.3.1 (2021-05-18)

  • Sprixels no longer interact with their associated plane's framebuffer. This means plane contents are maintainted across blitting a sprixel and then independently destroying that sprixel (i.e. without destroying the plane). While the sprixel is bound to the plane, these contents are ignored (save that they will be reported by ncplane_at_yx()). Since no method currently exists to destroy a sprixel without destroying its plane, I don't think this will impact anyone.
  • 8bpc RGB is unconditionally enabled if the terminal emulator is determined to be Kitty, Alacritty, or foot; there is no longer any need to export COLORTERM on these terminals.
  • Fixed bad bug in ncvisual_resize() when growing an image. This isn't relevant to enlarging an ncvisual via scaling, but only when persistently growing one with ncvisual_resize().
  • Direct mode image rendering now honors the maxy and maxx parameters, which specify the maximum number of cell rows and columns, respectively, to use for the render. They were previously ignored, contrary to documentation. It is now an error to pass a negative number for either of these values. Use 0 to specify "as much space as is necessary".
  • Added ncdirectf_from_file(), ncdirectf_geom(), and ncdirectf_render(), with the net result that you can now (efficiently) get media geometry in direct mode. If you don't care about media geometry, you can keep using ncdirect_render_frame() and/or ncdirect_render_image(), and Godspeed. Oh yes, and ncdirectf_free(). Rien n'est simple, mais tout est facile....

• 2.3.0 (2021-05-09) "Triumph"

  • No user-visible changes.

• 2.2.11 (2021-05-08)

  • notcurses-core.pc is now generated with a Requires.private line matching the local system's source of Terminfo. This ought resolve static linking on systems with libtinfo embedded into libncurses.
  • Added ncblit_rgb_loose() and ncblit_rgb_packed() helpers for blitting 32bpp RGBx and 24bpp RGB.
  • Added ncplane_erase_region() to initialize all nccells within a region of a plane.

• 2.2.10 (2021-05-05)

  • Added NCVISUAL_OPTION_CHILDPLANE to interpret the n field of ncvisual_options as a parent plane.
  • Reimplemented ncdirect_cursor_down() using vertical tabs instead of the cud capability, so that it now scrolls when on the last line. Thanks to Daniel Eklöf for this idea, of which I was totally ignorant!
  • Fixed several embarrassing assert()s which I'd not had exposed due to misuse of CMake.
  • Fixed a state machine bug that caused sprixels to sometimes not be properly redisplayed following a rebuild.

• 2.2.9 (2021-05-03)

  • Added two new stats, sprixelemissions and sprixelelisions.
  • Added notcurses_canhalfblock() and notcurses_canquadrant().
  • The palette256 type has been renamed ncpalette, and all functions prefixed with palette256_ have been deprecated in favor of versions prefixed with ncpalette_, which the former now wrap. The old versions will be removed in ABI3.
  • All functions prefixed with channel_ have been deprecated in favor of versions prefixed with ncchannel_, which the former now wrap. The old versions will be removed in ABI3.
  • All functions prefixed with channels_ have been deprecated in favor of versions prefixed with ncchannels_, which the former now wrap. The old versions will be removed in ABI3.
  • SIGINT, SIGQUIT, and SIGTERM are now masked for the calling thread when writing starts, and unmasked when writing has ended. This prevents the writing thread from handling these signals in the middle of a write, which could otherwise leave the terminal locked up (if it resulted in aborting an escape sequence). The signal will be delivered when unblocked. For this to work properly, other threads ought also have these signals blocked. notcurses_getc() and friends thus no longer drop these signals from the provided sigset_t; they are instead added if not present.
  • Added nccell_width() to get the column length of an nccell.

• 2.2.8 (2021-04-18)

  • All remaining functions prefixed with cell_ or cells_ have been deprecated in favor of versions prefixed with nccell_ or nccell_, respectively, which the former now wrap. The old versions will be removed in ABI3.
  • ncvisual_inflate() has been added to perform non-interpolative enlarging. It is intended for use with pixel art.

• 2.2.6 (2021-04-12)

  • ncplane_rgba() has been deprecated in favor of the new function ncplane_as_rgba(), which the former now wraps. It will be removed in ABI3. The new function can report the synthesized pixel geometry.
  • ncvisual_geom() has been deprecated in favor of the new function ncvisual_blitter_geom(), which the former now wraps. It will be removed in ABI3. The new function can report the chosen blitter.
  • ncplane_pixelgeom() has been added, allowing callers to determine the size of the plane and cells in pixels, as well as the maximum bitmap size that can be displayed.
  • Added new function ncdirect_stream(), which does what you'd think.
  • cell_release() and cell_duplicate() have been migrated to nccell_release() and nccell_duplicate(), respectively. The former forms have been deprecated, and will be removed in API3.
  • Added NCVISUAL_OPTION_ADDALPHA, and the transcolor field to ncvisual_options. If the former flag is used, the latter color will be treated as transparent.

• 2.2.5 (2021-04-04)

  • Bugfix release, no user-visible changes.

• 2.2.4 (2021-03-29)

  • Implemented EXPERIMENTAL NCBLIT_PIXEL for terminals reporting the Kitty pixel graphics protocol.
  • Added notcurses_debug_caps() to dump terminal properties, both those reported and those inferred, to a FILE*.
  • Added NCOPTION_NO_CLEAR_BITMAPS option for notcurses_init().
  • Added ncplane_valign() and ncplane_halign(). ncplane_align() is now an alias for ncplane_halign(), and deprecated.
  • Added NCVISUAL_OPTION_HORALIGNED and NCVISUAL_OPTION_VERALIGNED flags for ncvisual_render().
  • Added NCPLANE_OPTION_VERALIGNED flag for ncplane_create().
  • Added the nctabbed widget for multiplexing planes data with navigational tabs. Courtesy Łukasz Drukała, in his first contribution.
  • Removed notcurses_canpixel(), which was obsoleted by notcurses_check_pixel_support().
  • Added NCPLANE_OPTION_MARGINALIZED flag for ncplane_create(). Added the ncplane_resize_marginalized() resize callback. This allows you to have automatic resizing with a margin relative to some parent plane.

• 2.2.3 (2021-03-08)

  • Implemented EXPERIMENTAL NCBLIT_PIXEL for terminals reporting Sixel support. Added notcurses_check_pixel_support() and its companion ncdirect_check_pixel_support(), which must be called (and must return success) before NCBLIT_PIXEL will be available. NCBLIT_PIXEL degrades to NCBLIT_3x2 until support is verified. This functionality is not yet well integrated into general rendering; it will not play nicely with other intersecting planes. Do not rely on current behavior.
  • Add the nctree widget for line-oriented hierarchical data. See the new notcurses_tree(3) man page for complete information.
  • Ceased exporting cell_fchannel(), cell_bchannel(), cell_set_fchannel(), and cell_set_bchannel(). These functions were never safe for users. Everything a user might want to manipulate can be manipulated with more granular functions.
  • Add SIGILL to the set of fatal signals we handle.
  • Added NCKEY_SIGNAL. NCKEY_RESIZE is now an alias for NCKEY_SIGNAL.
  • SIGCONT now synthesizes a NCKEY_SIGNAL, just like SIGWINCH.

• 2.2.2 (2021-02-18):

  • notcurses_stats() no longer qualifies its notcurses* argument with const, since it now takes a lock. I'm sorry about that, though on the plus side, data races can no longer result in invalid stats.
  • ncplane_qrcode() no longer accepts a blitter argument, since NCBLIT_2x1 is the only one that actually works with qr code scanners. I'm unaware of any external ncplane_qrcode() users, so hopefully this isn't a problem.

• 2.2.1 (2021-02-09):

  • Brown-bag release: fix UTF8 discovery in direct mode. Sorry!

• 2.2.0 (2021-02-08):

  • Add notcurses_canbraille() capability predicate.

• 2.1.8 (2021-02-03):

  • The notcurses-tetris binary has been renamed nctetris.
  • The new function channel_set_palindex() has been added.
  • NCDIRECT_OPTION_NO_READLINE has been removed after a short life.
  • ncdirect_readline() has been added. The first time used, it initializes Readline. Readline will be destroyed by ncdirect_stop() if it was ever initialized.

• 2.1.7 (2021-01-21):

  • Notcurses has been split into two libraries, notcurses-core and notcurses. The latter contains the heavyweight multimedia code, so that applications which don't need this functionality can link against only the former. pkg-config support is present for both. If using only notcurses_core, use the new functions notcurses_core_init() and/or ncdirect_core_init() in place of ncdirect_init() and notcurses_init(), or your program is unlikely to link.
  • The notcurses-view binary has been renamed ncplayer.

• 2.1.5 (2021-01-15):

  • Notcurses now depends on GNU Readline at build and runtime, entirely for the benefit of direct mode, which now prepares GNU Readline for safe use (unless the new NCDIRECT_OPTIONS_NO_READLINE is used).
  • ncplane_putstr_yx(), ncplane_putstr_stained(), and ncplane_putnstr_yx() now return the number of columns output, as long documented (they were mistakenly returning the number of bytes).
  • ncplane_abs_yx() has been added, returning the absolute coordinates of the plane's origin (i.e. coordinates relative to its pile).

• 2.1.4 (2021-01-03):

  • Direct mode now supports NCDIRECT_OPTION_NO_QUIT_SIGHANDLERS, and by default installs signal handlers similar to those of fullscreen mode. They will attempt to reset the terminal, and propagate the signal.
  • Add channels_fg_palindex() and channels_bg_palindex().

• 2.1.3 (2020-12-31)

  • ncdirect_styles_{set, on, off}() have been deprecated in favor of ncdirect_{set, on, off}_styles(), to match ncplane_ equivalents.
  • ncdirect_raster_frame() no longer requires blitter nor scale.
  • ncdirect_{fg, bg}_{default, rgb}() have been deprecated in favor of ncdirect_set_{fg, bg}_{default, rgb}(), to match ncplane.

• 2.1.2 (2020-12-25)

  • Add notcurses_linesigs_enable() and notcurses_linesigs_disable().
  • Divide ncdirect_render_image() into component ncdirect_render_frame() and ncdirect_raster_frame() (the original remains), allowing multiple threads to decode images concurrently.
  • Sextants are now considered supported for certain values of TERM.
  • ncvisual_default_blitter() has been deprecated in favor of the new function ncvisual_media_defblitter(). This function's opaque logic accepts a struct notcurses *, providing some future-proofing against blitter changes. This function is necessary to get NCBLIT_3x2 from NCBLIT_DEFAULT.

• 2.1.1 (2020-12-16)

  • Progress bars via ncprogbar, using the standard widget API.

• 2.1.0 (2020-12-13)

  • cell has been renamed nccell. The old name has been kept as an alias, but ought be considered deprecated. It will be removed in Notcurses 3.0.

• 2.0.12 (2020-12-12)

  • ncplane_resize_maximize() has been added, suitable for use as a resizecb. It resizes the plane to the visual area's size, and is the resizecb used by the standard plane.

• 2.0.11 (2020-12-09)

  • Added ncplane_descendant_p() predicate.

• 2.0.10 (2020-12-06)

  • ncpile_top() and ncpile_bottom() have been added, returning the top or bottommost plane, respectively, of the pile containing their argument.
  • Added cell_load_egc32(), allowing a cell to be released and then reloaded with a UTF-8 EGC of up to 4 bytes, passed as a uint32_t (as opposed to a const char *).

• 2.0.9 (2020-12-01)

  • ncmenus now automatically expand or shrink to match their binding plane.

• 2.0.8 (2020-11-27)

  • The major, minor, and patch versions are now available as preprocessor numeric defines, fit for comparisons at the cpp level. The NOTCURSES_VERSION_COMPARABLE macro has been added, to form a comparable version ID from a provided major, minor, and patch level. The NOTCURSES_VERNUM_ORDERED macro has been added, defined as a comparable version ID for the current version of Notcurses.
  • Add new function ncplane_reparent_family(), which reparents a plane and its bindtree (all planes bound to the plane, recursively). ncplane_reparent() now reparents only the specified plane; any planes bound to it are reparented to its old parent.
  • Move to a multipile model. For full details, consult https://groups.google.com/g/notcurses/c/knB4ojndv8A and https://github.com/dankamongmen/notcurses/issues/1078 and notcurses_plane(3). In short:
    • A struct notcurses is now made up of one or more piles. A pile is one or more ncplanes, with a bindtree and a z-axis. Different piles can be mutated or rendered concurrently. There is no new user-visible type: a struct notcurses can be treated as a single pile.
    • To create a new pile from a new plane, use the new function ncpile_create(). The returned plane will be the top, bottom, and root of a new plane. Alternatively, use ncplane_reparent() or ncplane_reparent_family() with the source equal to the destination.
    • Add new function ncpile_render(), which renders the pile containing the specified plane to the specified buffer. Add new function ncpile_rasterize() to rasterize the specified buffer to output.
  • Added NCSTYLE_STRUCK for strikethrough. Note that this is not supported by terminfo, and we instead just hardcode the control sequence. Use at your own risk! If your terminal doesn't support this control sequence, behavior is undefined.

• 2.0.7 (2020-11-21)

  • The horiz union of ncplane_options has been discarded; the int x within has been promoted. This union brought no actual type safety, and was annoying for callers to deal with otherwise. Sorry for the inconvenience.
  • Added ncplane_set_resizecb() and ncplane_resizecb().

• 2.0.3 (2020-11-09)

  • Add NCBLIT_3x2 aka the SEXBLITTER, making use of Unicode 13's sextant glyphs. notcurses_lex_blitter() now recognizes sexblitter.
  • Blitting functions no longer count transparent cells towards the total returned number of cells written, but since these are not directly callable by the user, this ought not lead to any user-visible changes.
  • Added (k)eller demo to notcurses-demo.
  • ncreader now supports Alt+'b' to move one word back, Alt+'f' to move one word forward, Ctrl+'A' to move to the beginning of the line, Ctrl+'E' to move to the end of the line, Ctrl+'U' to clear the line before the cursor, and Ctrl+'W' to clear the word before the cursor (when NCREADER_OPTION_NOCMDKEYS has not been specified).

• 2.0.2 (2020-10-25)

  • Add ncvisual_decode_loop(), which returns to the first frame upon reaching the end of a file.

• 2.0.1 (2020-10-19)

  • Add ncmenu_item_set_status() for disabling or enabling menu items.
    • Disabled menu items cannot be selected.
    • Menu sections consisting only of disabled items are themselves disabled, and cannot be unrolled.
  • Add ncinput_equal_p() for comparison of ncinput structure data.
  • ncmenu_offer_input() now recognizes the shortcuts for registered sections, and will unroll the appropriate section when given input.
  • Added notcurses_stddim_yx_const() (notcurses_stddim_yx() const form).

• 2.0.0 (2020-10-12) "Stankonia"

  • API STABILITY! The API expressed in 2.0.0 will be maintained throughout at least 2.x.x. A program compiled against 2.0.0 will continue to compile and function properly against all 2.x.x releases. Thanks for putting up with the freewheeling API breakage until now.
  • NOTCURSES_VERSION_{MAJOR, MINOR, PATCH, TWEAK} are now available from notcurses/version.h. These represent the version your program was compiled against. The version your program is linked to can still be acquired with notcurses_version_components() (or as a human-readable string via notcurses_version()).

• 1.7.6 (2020-10-09)

  • ncstats added the new stats writeout_ns, writeout_min_ns, and writeout_max_ns. The render_*ns stats now only cover the rendering and rasterizing process. The writeout*ns stats cover the time spent writing data out to the terminal. notcurses_render() involves both of these processes.
  • notcurses_render_to_buffer() has been added, allowing user control of the process of writing frames out to the terminal.
  • notcurses_stats_alloc() has been added, to allocate an ncstats object. notcurses_reset_stats() has been renamed notcurses_stats_reset().
  • Two flags have been defined for ncdirect_init(): NCDIRECT_OPTION_INHIBIT_SETLOCALE and NCDIRECT_OPTION_INHIBIT_CBREAK. The former is similar to NCOPTION_INHIBIT_SETLOCALE. The latter keeps ncdirect_init() from touching the termios and entering cbreak mode.
  • The C++ wrapper Ncplane::putwc() has been renamed Ncplane::putwch(), so as not to clash with standard libraries implementing putwc() as a macro.

• 1.7.5 (2020-09-29)

  • ncreel_destroy() now returns void rather than int.
  • nctablet_ncplane() has been renamed nctablet_plane().
  • The standard plane now has the name std.
  • Removed long-deprecated ncplane_set_attrs() and ncplane_attrs().
  • Renamed ncplane_styles_*() to ncplane_*_styles(), to conform with every other ncplane_set_*() function, but retained the old versions as (deprecated) aliases.
  • Renamed cell_styles_*() to cell_*_styles(), to conform with every other cell_set_*() function. Since these were inline functions, I've not bothered to retain the old versions.

• 1.7.4 (2020-09-20)

  • All _rgb_clipped() functions have been renamed _rgb8_clipped(), to match the changes made in 1.7.2. Sorry, I ought have done this before.
  • ncplane_create() has been introduced, taking a struct ncplane_options parameter. This replaces ncplane_aligned(), and will replace ncplane_new(). The latter ought be considered deprecated, and will be removed in the future. To align a place as previously done with ncplane_aligned(), use the NCPLANE_OPTION_HORALIGNED flag.
  • The ncplane_options struct includes a function pointer member, resizecb. If not NULL, this function will be called after the parent plane is resized. See notcurses_plane.3 for more information.
  • ncplane_resize_realign() has been added, suitable for use as a resizecb. It realigns the plane against its parent.
  • NCCHANNEL_ALPHA_MASK has been renamed CHANNEL_ALPHA_MASK, to match the other declarations.

• 1.7.3 (2020-09-19)

  • API changes pursuant to 2.0 API finalization:
  • mbswidth() has been renamed ncstrwidth().
  • The long-promised/dreaded Great Widget Review, normalizing behavior across all widgets, has been effected. Sorry, there was no getting around this one. Pretty much all widgets have slightly changed, because pretty much all widgets previously behaved slightly differently:
    • ncselector_create() and ncmultiselector_create() now take ownership of the provided ncplane. On an error in these functions, the ncplane will be destroyed. Otherwise, the ncplane is destroyed by ncselector_destroy() or ncmultiselector_destroy().
    • ncselector_create(), ncmultiselector_create(), and ncreader_create() no longer accept int y, int x placement parameters. Just place the ncplane.
    • ncselector_options, ncmultiselector_options, and ncreel_options have lost their bgchannels members. Just set the base character for the ncplane.
    • ncreader_options has lost its echannels, eattrword, egc, physrows, and physcols fields. Just set the base character and size for the ncplane.
  • Functions which set a 24-bit RGB value have had the suffix g replaced with g_rgb. Functions which set three 8-bit RGB components have had the suffix rgb replaced with rgb8. This was done because e.g. channels_set_fg() and channels_set_fchannel() were indistinguishable on sight. Failure to make the necessary conversions will result in compiler errors. See https://github.com/dankamongmen/notcurses/issues/985.
  • Functions ending in _stainable() now end in _stained().
  • ncplane_putwc_stained() and ncplane_putwstr_stained() have been added in the interest of orthogonality.
  • ncplane_new_named() has been eliminated. ncplane_new() now takes a const char* name argument. ncplane_bound() and ncplane_bound_named() have both been eliminated. ncplane_new() now accepts an ncplane* instead of a notcurses*. All functionality exposed by the removed functions is thus now present in ncplane_new().
  • ncplane_aligned_named() has been removed. ncplane_aligned() now accepts a const char* name argument.

• 1.7.2 (2020-09-09)

  • Exported ncvisual_default_blitter(), so that the effective value of NCBLIT_DEFAULT can be determined.
  • Added NCREADER_OPTION_CURSOR, instructing the ncreader to make the terminal cursor visible, and manage the cursor's placement.

• 1.7.1 (2020-08-31)

  • Renamed CELL_SIMPLE_INITIALIZER to CELL_CHAR_INITIALIZER, and cell_load_simple() to cell_load_char().
  • Renamed ncplane_putsimple() to ncplane_putchar(), ncplane_putsimple_stainable() to ncplane_putchar_stainable(), and ncplane_putsimple_yx() to ncplane_putchar_yx().

• 1.7.0 (2020-08-30)

  • Added notcurses_ucs32_to_utf8() conversion helper.
  • ncdirect_init() now takes a third uint64_t flags parameter. No flags have been defined, and this parameter ought be set to 0.

• 1.6.20 (2020-08-30)

  • Added convenience functions ncplane_y() and ncplane_x(), components of longstanding ncplane_yx().
  • ncreel functions now generally call ncreel_redraw() themselves. This includes ncreel_add(), ncreel_del(), ncreel_next(), and ncreel_prev(). ncreel_redraw() need only be called to update tablets.
  • In order to conform with CMake naming conventions, our CMake package is now accessed as "Notcurses" rather than "notcurses".

• 1.6.19 (2020-08-27)

  • Direct mode now places the terminal into "cbreak mode". This disables echo and line-buffering of input. If this is undesirable, you can restore the terminal state following ncdirect_init(), but this will break the semantics of ncdirect_getc() and derivatives (due to line buffering).
  • The notcurses input layer has been reproduced for direct mode, including ncdirect_getc(), ncdirect_getc_nblock(), ncdirect_getc_blocking(), and ncdirect_inputready_fd(). Mouse support is not yet available in direct mode, but becomes possible through these additions.
  • Some very subtle bugs on big-endian machines have been repaired. Be aware that if your execution endianness does not match the endianness assumed at build time, you're gonna have a rough go of it.

• 1.6.18 (2020-08-25)

  • nc_err_e has been taken behind the shed and shot in the face. All functions which once returned nc_err_e now return a bimodal int. Those functions which accepted a value-result nc_err_e* no longer take this argument.
  • notcurses_cursor_enable() now takes two int parameters specifying the desired location of the cursor. Both notcurses_cursor_enable() and notcurses_cursor_disable() now return int rather than void.
  • NCOPTION_RETAIN_CURSOR has been removed.
  • ncreader now implements NCREADER_OPTION_HORSCROLL for horizontal scrolling. In addition, the following functions have been added:
    • int ncreader_move_left(struct ncreader* n)
    • int ncreader_move_right(struct ncreader* n)
    • int ncreader_move_up(struct ncreader* n)
    • int ncreader_move_down(struct ncreader* n)
    • int ncreader_write_egc(struct ncreader* n, const char* egc).
  • Added ncplane_above() and notcurses_bottom().
  • Added ncplane_set_fchannel() and ncplane_set_bchannel().

• 1.6.17 (2020-08-22)

  • ncdirect_flush() now takes a const struct ncdirect*.
  • A const char* title field has been added to ncplot_options. If not NULL, this title will be displayed to the right of any labels. Plot data will cover the title, if present.
  • ncplot no longer inverts maxchannel and minchannel. Speaking of which, both of these fields are now plural, maxchannels etc.

• 1.6.16 (2020-08-22)

  • cell_simple_p() has been removed. It is no longer a useful concept for user code, and its presence is indicative of a likely error.
  • channels_blend() has been removed. It wasn't really useful to users, and was difficult to explain.
  • ncplane_mergedown() has been renamed ncplane_mergedown_simple(). A more general form, capable of projecting arbitrary subregions of the source plane down to the destination plane. The source argument to ncplane_mergedown_simple() is now const.
  • iprefix() has been added, corresponding to IPREFIXSTRLEN. This ought be used if you want binary prefixes without the 'i' suffix indicating binary prefixes, which I predict will endear you to exactly no one.
  • Added channels_set_fg_palindex() and channels_set_bg_palindex(). Rewrote cell_set_fg_palindex() and cell_set_bg_palindex() in terms of these two. This is possible because the palette index now overlaps the RGB in a channel (they were originally in the attrword).
  • Added ncdirect_flush(), mainly for the benefit of FFI that might not have a native interface to fflush(3).
  • The ncplot_options struct has a new field, legendstyle. If the dependent variable is being labeled, this style will be applied to the legend. Without NCPLOT_OPTION_LABELTICKSD, this value is ignored.

• 1.6.15 (2020-08-16)

  • Styles now work properly with ncdirect, which apparently has never been the case until now :/.
  • EGCs occupying four bytes or fewer when encoded as UTF8 are now inlined directly into the cell structure. This should mean nothing for you save less memory consumption per plane, and faster operation. In the course of doing so, the attrword field of the cell structure was renamed stylemask, and reduced from 32 to 16 bits.
  • notcurses_palette_size() now returns unsigned.

• 1.6.12 (2020-08-12)

  • ncreels tabletcb callback function semantics are radically simplified. No more worrying about borders that might or might not have been drawn; simply fill up the plane that you're handed. This eliminates four of the seven arguments to these callbacks. I hope the inconvenience of adapting them is worth the elimination of complexity therein; I obviously think it is =].
  • ncselector_redraw() and ncmultiselector_redraw() no longer call notcurses_render(). You will need to call notcurses_render() for the display to reflect any changes. ncselector_create now binds the plane it creates to the plane it was provided, and no longer checks to ensure the widget can be fit within the borders of this binding plane.
  • Added ncplane_new_named(), ncplane_bound_named(), and ncplane_aligned_named(). These would be the defaults, but I didn't want to break existing code. They might become the defaults by 2.0. Names are used only for debugging (notcurses_debug()) at this time.
  • Added ncplane_parent() and ncplane_parent_const() for accessing the plane to which a plane is bound.
  • The notcurses Rust crate (rust/notcurses) has been moved to dankamongmen/notcurses-rs on GitHub, and removed from the tree. Jose Luis will be leading development on this high-level wrapper.

• 1.6.11 (2020-08-03)

  • cell_egc_idx() is no longer exported; it was never intended to be.

• 1.6.10 (2020-08-01)

  • The egc member of ncreader_options is now const.

• 1.6.7 (2020-07-26)

  • GNU libunistring is now required to build/load Notcurses.
  • Added ncmenu_mouse_selection(). Escape now closes an unrolled menu when processed by ncmenu_offer_input().

• 1.6.6 (2020-07-19)

  • notcurses-pydemo is now only installed alongside the Python module, using setuptools. CMake no longer installs it.
  • Added notcurses_lex_blitter() and notcurses_str_scalemode().

• 1.6.4 (2020-07-19)

  • Added notcurses_str_blitter().

• 1.6.2 (2020-07-15)

  • The option NCOPTION_NO_FONT_CHANGES has been added. This will cause Notcurses to not muck with the current font. Because...
  • Notcurses now detects a Linux text console, and reprograms its Unicode to glyph tables and font data tables to include certain Box-Drawing and Block-Drawing glyphs. This vastly improves multimedia rendering and line/box art in the Linux console.

• 1.6.1 (2020-07-12)

  • Added notcurses_version_components() to get the numeric components of the loaded Notcurses version.
  • Added notcurses_render_file() to dump last rendered frame to a FILE*.
  • The ncreel widget has been overhauled to bring it in line with the others (ncreel began life in another project, predating Notcurses). The toff, boff, roff, and loff fields of ncreel_options have been purged, as have min_ and max_supported_rows and _cols. There is no longer any need to provide a pipe/eventfd. ncreel_touch(), ncreel_del_focused(), and ncreel_move() have been removed.
  • Added ncdirect_hline_interp(), ncdirect_vline_interp(), ncdirect_rounded_box(), ncdirect_double_box(), and the ridiculously flexible ncdirect_box().
  • Added ncplane_putstr_stainable().

• 1.6.0 (2020-07-04)

  • Behavior has changed regarding use of the provided FILE* (which, when NULL, is assumed to be stdout). Both Notcurses and ncdirect now try to open a handle to the controlling TTY, unless the provided FILE is a TTY, in which case it is used directly. Certain interactions now only go to a TTY, in particular ncdirect_cursor_yx() and various ioctl()s used internally. Furthermore, when no true TTY is found (true for e.g. daemonized processes and those in a Docker launched without -t), Notcurses (in both full mode and direct mode) will return a virtual screen size of 80x24. This greatly improves behavior when redirecting to a file or lacking a TTY; one upshot is that we now have much-expanded unit test coverage in the Docker+Drone autobuilders.
  • ncdirect_render_image() has been added, allowing images (but not videos or animated images) to be rendered directly into the standard I/O streams. It begins drawing from the current cursor position, running through the right-hand side of the screen, and scrolling as much content as is necessary.
  • ncneofetch has been rewritten to use ncdirect, and thus no longer clobbers your entire terminal, and scrolls like standard I/O.

• 1.5.3 (2020-06-28)

  • The default blitter when NCSCALE_STRETCH is used is now NCBLIT_2x2, replacing NCBLIT_2x1. It is not the default for NCSCALE_NONE and NCSCALE_SCALE because it does not preserve aspect ratio.
  • The values of CELL_ALPHA_OPAQUE and friends have been redefined to match their values within a channel representation. If you've been using the named constants, this should have no effect on you; they sort the same, subtract the same, and a zero initialization remains just as opaque as it ever was. If you weren't using their named constants, now's an excellent time to revise that policy. CELL_ALPHA_SHIFT has been eliminated; if you happened to be using this, the redefinition of the other CELL_* constants (probably) means you no longer need to.

• 1.5.2 (2020-06-19)

  • The ncneofetch program has been added, of no great consequence.
  • A NULL value can now be passed as sbytes to ncplane_puttext().
  • ncvisual_geom() now takes scaling into account.
  • notcurses_cantruecolor() has been added, allowing clients to determine whether the full RGB space is available to us. If not, we only have palette-indexed pseudocolor.

• 1.5.1 (2020-06-15)

  • The semantics of rendering have changed slightly. In 1.5.0 and prior versions, a cell without a glyph was replaced in toto by that plane's base cell at rendering time. The replacement is now tripartite: if there is no glyph, the base cell's glyph is used; if there is a default foreground, the base cell's foreground is used; if there is a default background, the base cell's background is used. This will hopefully be more intuitive, and allows a plane to effect overlays of varying colors without needing to override glyphs (#395).
  • ncvisual_geom()'s ncblitter_e argument has been replaced with a const struct ncvisual_options*, so that NCVISUAL_OPTIONS_NODEGRADE can be taken into account (the latter contains a blitter_e field).
  • Added ncuplot_sample() and ncdplot_sample(), allowing retrieval of sample data from ncuplots and ncdplots, respectively.
  • Added convenience function ncplane_home(), which sets the cursor to the plane's origin (and returns void, since it cannot fail).
  • ncplane_qrcode() now accepts an ncblitter_e, and two value-result int*s ymax and xmax. The actual size of the drawn code is returned in these parameters.

• 1.5.0 (2020-06-08)

  • The various bools of struct notcurses_options have been folded into that struct's flags field. Each bool has its own NCOPTION_.
  • Added a Pixel API for working directly with the contents of ncvisuals, including ncvisual_at_yx() and ncvisual_set_yx().
  • Added ncplane_puttext() for writing multiline, line-broken text.
  • Added ncplane_putnstr(), ncplane_putnstr_yx(), and ncplane_putnstr_aligned() for byte-limited output of UTF-8.

• 1.4.5 (2020-06-04)

  • ncblit_rgba() and ncblit_bgrx() have replaced most of their arguments with a const struct ncvisual_options*. NCBLIT_DEFAULT will use NCBLITTER_2x1 (with fallback) in this context. The ->n field must be non-NULL--new planes will not be created.
  • Added ncplane_notcurses_const().

• 1.4.4.1 (2020-06-01)

  • Got the ncvisual API ready for API freeze: ncvisual_render() and ncvisual_stream() now take a struct ncvisual_options. ncstyle_e and a few other parameters have been moved within. Both functions now take a struct notcurses*. The struct ncvisual_options includes a ncblitter_e field, allowing visuals to be mapped to various plotting paradigms including Sixel, Braille and quadrants. Not all backends have been implemented, and not all implementations are in their final form. CELL_ALPHA_BLEND can now be used for translucent visuals.
  • Added ncvisual_geom(), providing access to an ncvisual size and its pixel-to-cell blitting ratios.
  • Deprecated functions ncvisual_open_plane() and ncplane_visual_open() have been removed. Their functionality is present in ncvisual_from_file(). The function ncvisual_plane() no longer has any meaning, and has been removed.
  • The fadecb typedef now accepts as its third argument a const struct timespec. This is the absolute deadline through which the frame ought be displayed. New functions have been added to the Fade API: like the changes to ncvisual_stream(), this gives more flexibility, and allows more precise timing. All old functions remain available.

• 1.4.3 (2020-05-22)

  • Plot: make 8x1 the default, instead of 1x1.
  • Add PREFIXFMT, BPREFIXFMT, and IPREFIXFMT macros for ncmetric(). In order to properly use printf(3)'s field width capability, these macros must be used. This is necessary to support 'µ' (micro).
  • C++'s NotCurses constructor now passes a nullptr directly through to notcurses_init(), rather than replacing it with stdout.
  • Added USE_STATIC CMake option, defaulting to ON. If turned OFF, static libraries will not be built.

• 1.4.2.4 (2020-05-20)

  • Removed ncplane_move_above_unsafe() and ncplane_move_below_unsafe(); all z-axis moves are now safe. Z-axis moves are all now O(1), rather than the previous O(N).

• 1.4.2.3 (2020-05-17)

  • Added notcurses_canutf8(), to verify use of UTF-8 encoding.
  • Fixed bug in ncvisual_from_plane() when invoked on the standard plane.
  • ncvisual_from_plane() now accepts the same four geometric parameters as other plane selectors. To reproduce the old behavior, for ncv, call it as ncvisual_from_plane(ncv, 0, 0, -1, -1).
  • ncvisual_from_plane(), ncplane_move_below_unsafe(), ncplane_dup(), and ncplane_move_above_unsafe() now accept const arguments where they did not before.
  • notcurses_canopen() has been split into notcurses_canopen_images() and notcurses_canopen_videos().
  • ncmetric() now uses multibyte suffixes (particularly for the case of 'µ', i.e. micro). This has changed the values of PREFIXSTRLEN and friends. So long as you were using PREFIXSTRLEN, this should require only a recompile. If you were using PREFIXSTRLEN in a formatted output context to count columns, you must change to PREFIXCOLUMNS etc.
  • The streamcb type definition now accepts a const struct timespec* as its third argument. This is the absolute time viz CLOCK_MONOTONIC through which the frame ought be displayed. The callback must now effect delay.
  • Mouse coordinates are now properly translated for any margins.
  • qprefix() and bprefix() now take a uintmax_t in place of an unsigned, to match ncprefix.

• 1.4.0 (2020-05-10)

  • ncplane_content() was added. It allows all non-null glyphs of a plane to be returned as a nul-terminated, heap-allocated string.
  • ncreader was added. This widget allows freeform input to be edited in a block, and collected into a string.
  • selector_options has been renamed to ncselector_options, and multiselector_options has been renamed to ncmultiselector_options. This matches the other widget option struct's nomenclature.
  • ncplane_set_channels() and ncplane_set_attr() have been added to allow ncplane attributes to be set directly and in toto.
  • NULL can now be passed as the FILE* argument to notcurses_init() and ncdirect_init(). In this case, a new FILE* will be created using /dev/tty. If the FILE* cannot be created, an error will be returned.
  • A flags field has been added to notcurses_options. This will allow new boolean options to be added in the future without resizing the structure. Define NCOPTION_INHIBIT_SETLOCALE bit. If it's not set, and the "C" or "POSIX" locale is in use, notcurses_init() will invoke setlocale(LC_ALL, "").
  • All widgets now take an ncplane* as their first argument (some took notcurses* before). All widgets' options structs now have an unsigned flags bitfield. This future-proofs the widget API, to a degree.

• 1.3.4 (2020-05-07)

  • notcurses_lex_margins() has been added to lex margins expressed in either of two canonical formats. Hopefully this will lead to more programs supporting margins.
  • ncvisual_open_plane() has been renamed ncvisual_from_file(). The former has been retained as a deprecated alias. It will be removed by 1.6/2.0.
  • ncvisual_from_rgba() and ncvisual_from_bgra() have been added to support creation of ncvisuals from memory, requiring no file.
  • ncvisual_rotate() has been added, supporting rotations of arbitrary radians on ncvisual objects.
  • ncvisual_from_plane() has been added to support "promotion" of an ncplane to an ncvisual. The source plane may contain only spaces, half blocks, and full blocks. This builds atop the new function ncplane_rgba(), which makes an RGBA flat array from an ncplane.
  • The ncplane argument to ncplane_at_yx() is now const.

• 1.3.3 (2020-04-26)

  • The ncdplot type has been added for plots based on doubles rather than uint64_ts. The ncplot type and all ncplot_* functions were renamed ncuplot for symmetry.
  • FFMpeg types are no longer leaked through the Notcurses API. AVERROR is no longer applicable, and ncvisual_decode() no longer returns a struct AVframe*. Instead, the nc_err_e enumeration has been introduced. Functions which once accepted a value-result AVERROR now accept a value- result nc_err_e. The relevant constants can be found in notcurses/ncerrs.h.
  • OpenImageIO 2.1+ is now supported as an experimental multimedia backend. FFmpeg remains recommended. Video support with OIIO is spotty thus far.
  • CMake no longer uses the USE_FFMPEG option. Instead, the USE_MULTIMEDIA option can be defined as ffmpeg, oiio, or none. In cmake-gui, this item will now appear as an option selector. oiio selects OpenImageIO.

• 1.3.2 (2020-04-19)

  • ncdirect_cursor_push(), notcurses_cursor_pop(), and ncdirect_cursor_yx() have been added. These are not supported on all terminals. ncdirect_cursor_yx() ought be considered experimental; it must read a response from the terminal, and this can interact poorly with other uses of standard input.
  • 1.3.1 unintentionally inverted the C++ Notcurses::render() wrapper's return code. The previous semantics have been restored.

• 1.3.1 (2020-04-18)

  • ncplane_at_yx() and ncplane_at_cursor() have been changed to return a heap-allocated EGC, and write the attributes and channels to value-result uint32_t* and uint64_t* parameters, instead of to a cell*. This matches notcurses_at_yx(), and means they're no longer invalidated if the plane in question is destroyed. The previous functionality is available as new functions ncplane_at_yx_cell() and ncplane_at_cursor_cell().
  • ncplane_set_base() inverted its uint32_t attrword and uint64_t channels parameters, thus matching every other function with these two parameters. It moved const char* egc before either, to force a type error, as the change would otherwise be likely to go overlooked.
  • Scrolling is now completely implemented. When a plane has scrolling enabled through use of ncplane_set_scrolling(true), output past the end of the last line will now result in the top line of the plane being lost, all other lines moved up one, and the bottom line cleared.

• 1.2.8 (2020-04-10)

  • notcurses-tetris now happily continues if it can't load its background.

• 1.2.7 (2020-04-10)

  • Plots now always keep the most recent data to their far right (i.e., the gap that is initially filled is on the left, rather than the right).

• 1.2.6 (2020-04-08)

  • ncplane_putsimple_yx() and ncplane_putstr_yx() have been exported as static inline functions.
  • ncplane_set_scrolling() has been added, allowing control over whether a plane scrolls. All planes, including the standard plane, do not scroll by default. If scrolling is enabled, text output via the *put* family of functions continues onto the next line when encountering the end of a row. This does not apply to e.g. boxes or lines.
  • ncplane_putstr_yx() now always returns the inverse of the number of columns advanced on an error (it used to return the positive short count so long as the error was due to plane geometry, not bad input).
  • ncplot_add_sample() and ncplot_set_sample() have been changed to accept a uint64_t rather than int64_t, since negative samples do not currently make sense. Plots were made more accurate in general.
  • notcurses_term_dim_yx() now accepts a const struct notcurses*.
  • notcurses_resize() is no longer exported. It was never necessary to call this in response to a resize, despite confusing documentation that could have been read to suggest otherwise. If you're in a long block on input, and get an NCKEY_RESIZE, just call notcurses_refresh() (which now calls notcurses_resize() internally, as notcurses_render() always has).
  • First Fedora packaging.

• 1.2.5 (2020-04-05)

  • Add ncplot, with support for sliding-windowed horizontal histograms.
  • gradient, polyfill, ncplane_format() and ncplane_stain() all now return the number of cells written on success. Failure still sees -1 returned.
  • ncvisual_render() now returns the number of cells emitted on success, as opposed to 0. Failure still sees -1 returned.
  • ncvisual_render() now interprets length parameters of -1 to mean "to the end along this axis", and no longer interprets 0 to mean this. 0 now means "a length of 0", resulting in a zero-area rendering.
  • notcurses_at_yx() no longer accepts a cell* as its last parameter. Instead, it accepts a uint32_t* and a uint64_t*, and writes the attribute and channels to these parameters. This was done because the gcluster field of the cell* was always set to 0, which was surprising and a source of blunders. The EGC is returned via the char* return value. https://github.com/dankamongmen/notcurses/issues/410

• 1.2.4 (2020-03-24)

  • Add ncmultiselector
  • Add ncdirect_cursor_enable() and ncdirect_cursor_disable().