Add support for the Haiku operating system and its window system

* .gitignore: Add binaries specific to Haiku.

* Makefie.in (HAVE_BE_APP): New variable.
(install-arch-dep): Install Emacs and Emacs.pdmp when
using Haiku.

* configure.ac: Detect and configure for Haiku and
various related configurations.
(be-app, be-freetype, be-cairo): New options.
(HAVE_BE_APP, HAIKU_OBJ, HAIKU_CXX_OBJ)
(HAIKU_LIBS, HAIKU_CFLAGS): New variables.
(HAIKU, HAVE_TINY_SPEED_T): New define.
(emacs_config_features): Add BE_APP.

* doc/emacs/Makefile.in (EMACSSOURCES): Add Haiku
appendix.

* doc/emacs/emacs.texi: Add Haiku appendix to menus and
include it.

* doc/emacs/haiku.texi: New Haiku appendix.

* doc/lispref/display.texi (Defining Faces, Window Systems):
Explain meaning of `haiku' as a window system identifier.
(haiku-use-system-tooltips): Explain meaning of system
tooltips on
Haiku.

* doc/lispref/frames.texi (Multiple Terminals): Explain
meaning of haiku as a display type.
(Frame Layout): Clarify section for Haiku frames.
(Size Parameters): Explain limitations of fullwidth and
fullheight on Haiku.
(Management Parameters): Explain limitations of
inhibiting double buffering on builds with Cairo,
and the inability of frames with no-accept-focus to
receive keyboard input on Haiku.
(Font and Color Parameters): Explain the different font
backends available on Haiku.
(Raising and Lowering): Explain that lowering and
restacking frames doesn't work on Haiku.
(Child Frames): Explain oddities of child frame
visibility on Haiku.

* doc/lispref/os.texi (System Environment): Explain
meaning of haiku.
* etc/MACHINES: Add appropriate notices for Haiku.
* etc/NEWS: Document changes.
* etc/PROBLEMS: Document font spacing bug on Haiku.

* lib-src/Makefile.in: Build be-resources binary on
Haiku.
(CXX, CXXFLAGS, NON_CXX_FLAGS, ALL_CXXFLAGS)
(HAVE_BE_APP, HAIKU_LIBS, HAIKU_CFLAGS): New variables.
(DONT_INSTALL): Add be-resources binary if on Haiku.
(be-resources): New target.

* lib-src/be_resources: Add helper binary for setting
resources on the Emacs application.

* lib-src/emacsclient.c (decode_options): Set
alt_display to "be" on Haiku.

* lisp/cus-edit.el (custom-button, custom-button-mouse)
(custom-button-unraised, custom-button-pressed): Update
face definitions for Haiku.

* lisp/cus-start.el: Add haiku-debug-on-fatal-error and
haiku-use-system-tooltips.

* lisp/faces.el (face-valid-attribute-values): Clarify
attribute comment for Haiku.
(tool-bar): Add appropriate toolbar color for Haiku.

* lisp/frame.el (haiku-frame-geometry)
(haiku-mouse-absolute-pixel-position)
(haiku-set-mouse-absolute-pixel-position)
(haiku-frame-edges)
(haiku-frame-list-z-order): New function declarations.

(frame-geometry, frame-edges)
(mouse-absolute-pixel-position)
(set-mouse-absolute-pixel-position)
(frame-list-z-order): Call appropriate window system
functions on Haiku.

(display-mouse-p, display-graphic-p)
(display-images-p, display-pixel-height)
(display-pixel-width, display-mm-height)
(display-mm-width, display-backing-store)
(display-save-under, display-planes)
(display-color-cells, display-visual-class): Update type
tests for Haiku.

* lisp/international/mule-cmds.el
(set-coding-system-map): Also
prevent set-terminal-coding-system from appearing in the menu
bar on Haiku.

* lisp/loadup.el: Load Haiku-specific files when built
with Haiku, and don't rename newly built Emacs on Haiku as BFS
doesn't support hard links.

* lisp/menu-bar.el (menu-bar-open): Add for Haiku.

* lisp/mwheel.el (mouse-wheel-down-event): Expect
wheel-up on Haiku.
(mouse-wheel-up-event): Expect wheel-down on Haiku.
(mouse-wheel-left-event): Expect wheel-left on Haiku.
(mouse-wheel-right-event): Expect wheel-right on Haiku.

* lisp/net/browse-url.el
(browse-url--browser-defcustom-type):
Add option for WebPositive.
(browse-url-webpositive-program): New variable.
(browse-url-default-program): Search for WebPositive.
(browse-url-webpositive): New function.

* lisp/net/eww.el (eww-form-submit, eww-form-file)
(eww-form-checkbox, eww-form-select): Define faces
appropriately for Haiku.

* lisp/term/haiku-win.el: New file.

* lisp/tooltip.el (menu-or-popup-active-p): New function
declaration.
(tooltip-show-help): Don't use tooltips on Haiku when a
menu is active.

* lisp/version.el (haiku-get-version-string): New
function declaration.
(emacs-version): Add Haiku version string if
appropriate.

* src/Makefile.in: Also produce binary named "Emacs"
with Haiku resources set.

(CXX, HAIKU_OBJ, HAIKU_CXX_OBJ, HAIKU_LIBS)
(HAIKU_CFLAGS, HAVE_BE_APP, NON_CXX_FLAGS)
(ALL_CXX_FLAGS): New variables.

(.SUFFIXES): Add .cc.
(.cc.o): New target.
(base_obj): Add Haiku C objects.
(doc_obj, obj): Split objects that should scanned for
documentation into doc_obj.
(SOME_MACHINE_OBJECTS): Add appropriate Haiku C objects.
(all): Depend on Emacs and Emacs.pdmp on Haiku.
(LIBES): Add Haiku libraries.
(gl-stamp)
($(etc)/DOC): Scan doc_obj instead of obj
(temacs$(EXEEXT): Use C++ linker on Haiku.
(ctagsfiles3): New variable.
(TAGS): Scan C++ files.

* src/alloc.c (garbage_collect): Mark Haiku display.

* src/dispextern.h (HAVE_NATIVE_TRANSFORMS): Also enable
on Haiku.
(struct image): Add fields for Haiku transforms.
(RGB_PIXEL_COLOR): Define to unsigned long on Haiku as
well.
(sit_for): Also check USABLE_SIGPOLL.
(init_display_interactive): Set initial window system to
Haiku on Haiku builds.

* src/emacs.c (main): Define Haiku syms and init haiku
clipboard.
(shut_down_emacs): Quit BApplication on Haiku and
trigger debug
on aborts if haiku_debug_on_fatal_error.
(Vsystem_type): Update docstring.

* src/fileio.c (next-read-file-uses-dialog-p): Enable on
Haiku.

* src/filelock.c (WTMP_FILE): Only define if BOOT_TIME
is also defined.

* src/floatfns.c (double_integer_scale): Work around
Haiku libroot brain damage.

* src/font.c (syms_of_font): Define appropriate font
driver symbols for Haiku builds with various options.

* src/font.h: Also enable ftcrfont on Haiku builds with
Cairo.
(font_data_structures_may_be_ill_formed): Also enable on
Haiku builds that have Cairo.

* src/frame.c (Fframep): Update doc-string for Haiku
builds and return haiku if appropriate.
(syms_of_frame): New symbol `haiku'.

* src/frame.h (struct frame): Add output data for Haiku.
(FRAME_HAIKU_P): New macro.
(FRAME_WINDOW_P): Test for Haiku frames as well.

* src/ftcrfont.c (RED_FROM_ULONG, GREEN_FROM_ULONG)
(BLUE_FROM_ULONG): New macros.
(ftcrfont_draw): Add haiku specific code for Haiku
builds with Cairo.

* src/ftfont.c (ftfont_open): Set face.
(ftfont_has_char, ftfont_text_extents): Work around
crash.
(syms_of_ftfont): New symbol `mono'.

* src/ftfont.h (struct font_info): Enable Cairo-specific
fields for Cairo builds on Haiku.

* src/haiku_draw_support.cc:
* src/haiku_font_support.cc:
* src/haiku_io.c:
* src/haiku_select.cc:
* src/haiku_support.cc:
* src/haiku_support.h:
* src/haikufns.c:
* src/haikufont.c:
* src/haikugui.h:
* src/haikuimage.c:
* src/haikumenu.c:
* src/haikuselect.c:
* src/haikuselect.h:
* src/haikuterm.c:
* src/haikuterm.h: Add new files for Haiku windowing
support.

* src/haiku.c: Add new files for Haiku operating system
support.

* src/image.c: Implement image transforms and native XPM
support
on Haiku.

(GET_PIXEL, PUT_PIXEL, NO_PIXMAP)
(PIX_MASK_RETAIN, PIX_MASK_DRAW)
(RGB_TO_ULONG, RED_FROM_ULONG, GREEN_FROM_ULONG)
(BLUE_FROM_ULONG, RED16_FROM_ULONG, GREEN16_FROM_ULONG)
(BLUE16_FROM_ULONG): Define to appropriate values on
Haiku.

(image_create_bitmap_from_data): Add Haiku support.
(image_create_bitmap_from_file): Add TODO on Haiku.
(free_bitmap_record): Free bitmap on Haiku.
(image_size_in_bytes): Implement for Haiku bitmaps.
(image_set_transform): Implement on Haiku.
(image_create_x_image_and_pixmap_1): Implement on Haiku,
24-bit or 1-bit only.
(image_destroy_x_image, image_get_x_image): Use correct
img and pixmap values on Haiku.
(lookup_rgb_color): Use correct macro on Haiku.
(image_to_emacs_colors): Implement on Haiku.
(image_disable_image): Disable on Haiku.
(image_can_use_native_api): Test for translator presence
on Haiku.
(native_image_load): Use translator on Haiku.
(imagemagick_load_image): Add Haiku-specific quirks.
(Fimage_transforms_p): Allow rotate90 on Haiku.
(image_types): Enable native XPM support on Haiku.
(syms_of_image): Enable XPM images on Haiku.

* src/keyboard.c (kbd_buffer_get_event)
(handle_async_input, handle_input_available_signal)
(handle_user_signal, Fset_input_interrupt_mode)
(init_keyboard): Check for USABLE_SIGPOLL along with
USABLE_SIGIO.

* src/lisp.h (pD): Work around broken Haiku headers.
(HAVE_EXT_MENU_BAR): Define on Haiku.
(handle_input_available_signal): Enable if we just have
SIGPOLL as well.

* src/menu.c (have_boxes): Return true on Haiku.
(single_menu_item): Enable toolkit menus on Haiku.
(find_and_call_menu_selection): Also enable on Haiku.

* src/process.c (keyboard_bit_set): Enable with only
usable SIGPOLL.
(wait_reading_process_output): Test for SIGPOLL as well
as SIGIO availability.

* src/sound.c (sound_perror, vox_open)
(vox_configure, vox_close): Enable for usable SIGPOLL as
well.

* src/sysdep.c (sys_subshell): Enable for usable SIGPOLL.
(reset_sigio): Make conditional on F_SETOWN.
(request_sigio, unrequest_sigio)
(emacs_sigaction_init): Also handle SIGPOLLs.
(init_sys_modes): Disable TCXONC usage on Haiku, as it
doesn't have any ttys other than pseudo ttys, which don't
support C-s/C-q flow control, and causes compiler warnings.
(speeds): Disable high speeds if HAVE_TINY_SPEED_T.

* src/termhooks.h (enum output_method): Add output_haiku.
(struct terminal): Add Haiku display info.
(TERMINAL_FONT_CACHE): Enable for Haiku.

* src/terminal.c (Fterminal_live_p): Return `haiku' if
appropriate.
* src/verbose.mk.in (AM_V_CXX, AM_V_CXXLD): New logging
variables.

* src/xdisp.c (redisplay_internal)
(note_mouse_highlight): Return on Haiku if a popup is activated.
(display_menu_bar): Return on Haiku if frame is a Haiku
frame.

* src/xfaces.c (GCGraphicsExposures): Enable correctly on Haiku.
(x_create_gc): Enable dummy GC code on Haiku.

* src/xfns.c (x-server-version, x-file-dialog): Add
Haiku specifics to doc strings.

* src/xterm.c (syms_of_xterm): Add Haiku information to
doc string.

3 files changed, 167 insertions, 0 deletions

diff --git a/lib-src/Makefile.in b/lib-src/Makefile.in
index e6cda733679..d062e78366f 100644
--- a/lib-src/Makefile.in
+++ b/lib-src/Makefile.in
@@ -27,7 +27,9 @@ EMACSOPT = -batch --no-site-file --no-site-lisp
 # ==================== Things 'configure' will edit ====================
 
 CC=@CC@
+CXX=@CXX@
 CFLAGS=@CFLAGS@
+CXXFLAGS=@CXXFLAGS@
 CPPFLAGS = @CPPFLAGS@
 LDFLAGS = @LDFLAGS@
 
@@ -130,6 +132,11 @@ MKDIR_P = @MKDIR_P@
 
 # ========================== Lists of Files ===========================
 
+## Haiku build-time support
+HAVE_BE_APP=@HAVE_BE_APP@
+HAIKU_LIBS=@HAIKU_LIBS@
+HAIKU_CFLAGS=@HAIKU_CFLAGS@
+
 # emacsclientw.exe for MinGW, empty otherwise
 CLIENTW = @CLIENTW@
 
@@ -143,7 +150,11 @@ UTILITIES = hexl${EXEEXT} 			 	 \
             $(if $(with_mailutils), , movemail${EXEEXT}) \
             $(and $(use_gamedir), update-game-score${EXEEXT})
 
+ifeq ($(HAVE_BE_APP),yes)
+DONT_INSTALL= make-docfile${EXEEXT} make-fingerprint${EXEEXT} be-resources
+else
 DONT_INSTALL= make-docfile${EXEEXT} make-fingerprint${EXEEXT}
+endif
 
 # Like UTILITIES, but they're not system-dependent, and should not be
 #  deleted by the distclean target.
@@ -230,6 +241,10 @@ WINDRES = @WINDRES@
 ## Some systems define this to request special libraries.
 LIBS_SYSTEM = @LIBS_SYSTEM@
 
+# Flags that could be in WARN_CFLAGS, but are invalid for C++.
+NON_CXX_CFLAGS = -Wmissing-prototypes -Wnested-externs -Wold-style-definition \
+  -Wstrict-prototypes -Wno-override-init
+
 BASE_CFLAGS = $(C_SWITCH_SYSTEM) $(C_SWITCH_MACHINE) \
               $(WARN_CFLAGS) $(WERROR_CFLAGS) \
               -I. -I../src -I../lib \
@@ -238,6 +253,9 @@ BASE_CFLAGS = $(C_SWITCH_SYSTEM) $(C_SWITCH_MACHINE) \
 ALL_CFLAGS = ${BASE_CFLAGS} ${PROFILING_CFLAGS} ${LDFLAGS} ${CPPFLAGS} ${CFLAGS}
 CPP_CFLAGS = ${BASE_CFLAGS} ${PROFILING_CFLAGS} ${CPPFLAGS} ${CFLAGS}
 
+ALL_CXXFLAGS = $(filter-out ${NON_CXX_CFLAGS},${BASE_CFLAGS}) \
+  ${PROFILING_CFLAGS} ${LDFLAGS} ${CPPFLAGS} ${CFLAGS} ${CXXFLAGS} ${HAIKU_CFLAGS}
+
 # Configuration files for .o files to depend on.
 config_h = ../src/config.h $(srcdir)/../src/conf_post.h
 
@@ -407,6 +425,9 @@ emacsclientw${EXEEXT}: ${srcdir}/emacsclient.c $(NTLIB) $(CLIENTRES) $(config_h)
            $(LOADLIBES) \
            $(LIB_WSOCK32) $(LIB_EACCESS) $(LIBS_ECLIENT) -o $@
 
+be-resources: ${srcdir}/be_resources.cc ${config_h}
+        $(AM_V_CXXLD)$(CXX) ${ALL_CXXFLAGS} ${HAIKU_LIBS} $< -o $@
+
 NTINC = ${srcdir}/../nt/inc
 NTDEPS = $(NTINC)/ms-w32.h $(NTINC)/sys/stat.h $(NTINC)/inttypes.h \
  $(NTINC)/stdint.h $(NTINC)/pwd.h $(NTINC)/sys/time.h $(NTINC)/stdbool.h \
diff --git a/lib-src/be_resources.cc b/lib-src/be_resources.cc
new file mode 100644
index 00000000000..e6a14f037b6
--- /dev/null
+++ b/lib-src/be_resources.cc
@@ -0,0 +1,144 @@
+/* Haiku window system support
+   Copyright (C) 2021 Free Software Foundation, Inc.
+
+This file is part of GNU Emacs.
+
+GNU Emacs is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or (at
+your option) any later version.
+
+GNU Emacs is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.  */
+
+#include <config.h>
+
+#include <cstdio>
+#include <cstring>
+#include <cstdlib>
+
+#include <SupportDefs.h>
+#include <Path.h>
+#include <AppFileInfo.h>
+#include <TranslationUtils.h>
+#include <Application.h>
+#include <Catalog.h>
+#include <Roster.h>
+
+using namespace std;
+
+static void
+be_perror (status_t code, char *arg)
+{
+  if (code != B_OK)
+    {
+      switch (code)
+        {
+        case B_BAD_VALUE:
+          fprintf (stderr, "%s: Bad value\n", arg);
+          break;
+        case B_ENTRY_NOT_FOUND:
+          fprintf (stderr, "%s: Not found\n", arg);
+          break;
+        case B_PERMISSION_DENIED:
+          fprintf (stderr, "%s: Permission denied\n", arg);
+          break;
+        case B_NO_MEMORY:
+          fprintf (stderr, "%s: No memory\n", arg);
+          break;
+        case B_LINK_LIMIT:
+          fprintf (stderr, "%s: Link limit reached\n", arg);
+          break;
+        case B_BUSY:
+          fprintf (stderr, "%s: Busy\n", arg);
+          break;
+        case B_NO_MORE_FDS:
+          fprintf (stderr, "%s: No more file descriptors\n", arg);
+          break;
+        case B_FILE_ERROR:
+          fprintf (stderr, "%s: File error\n", arg);
+          break;
+        default:
+          fprintf (stderr, "%s: Unknown error\n", arg);
+        }
+    }
+  else
+    {
+      abort ();
+    }
+}
+
+int
+main (int argc, char **argv)
+{
+  BApplication app ("application/x-vnd.GNU-emacs-resource-helper");
+  BFile file;
+  BBitmap *icon;
+  BAppFileInfo info;
+  status_t code;
+  struct version_info vinfo;
+  char *v = strdup (PACKAGE_VERSION);
+
+  if (argc != 3)
+    {
+      printf ("be-resources ICON FILE: make FILE appropriate for Emacs.\n");
+      return EXIT_FAILURE;
+    }
+
+  code = file.SetTo (argv[2], B_READ_WRITE);
+  if (code != B_OK)
+    {
+      be_perror (code, argv[2]);
+      return EXIT_FAILURE;
+    }
+  code = info.SetTo (&file);
+  if (code != B_OK)
+    {
+      be_perror (code, argv[2]);
+      return EXIT_FAILURE;
+    }
+  code = info.SetAppFlags (B_EXCLUSIVE_LAUNCH | B_ARGV_ONLY);
+  if (code != B_OK)
+    {
+      be_perror (code, argv[2]);
+      return EXIT_FAILURE;
+    }
+
+  icon = BTranslationUtils::GetBitmapFile (argv[1], NULL);
+
+  if (!icon)
+    {
+      be_perror (B_ERROR, argv[1]);
+      return EXIT_FAILURE;
+    }
+
+  info.SetIcon (icon, B_MINI_ICON);
+  info.SetIcon (icon, B_LARGE_ICON);
+  info.SetSignature ("application/x-vnd.GNU-emacs");
+
+  v = strtok (v, ".");
+  vinfo.major = atoi (v);
+
+  v = strtok (NULL, ".");
+  vinfo.middle = atoi (v);
+
+  v = strtok (NULL, ".");
+  vinfo.minor = v ? atoi (v) : 0;
+
+  vinfo.variety = 0;
+  vinfo.internal = 0;
+
+  strncpy ((char *) &vinfo.short_info, PACKAGE_VERSION,
+           sizeof vinfo.short_info - 1);
+  strncpy ((char *) &vinfo.long_info, PACKAGE_STRING,
+           sizeof vinfo.long_info - 1);
+
+  info.SetVersionInfo (&vinfo, B_APP_VERSION_KIND);
+
+  return EXIT_SUCCESS;
+}
diff --git a/lib-src/emacsclient.c b/lib-src/emacsclient.c
index 0e800dd7e89..c55b29830df 100644
--- a/lib-src/emacsclient.c
+++ b/lib-src/emacsclient.c
@@ -603,6 +603,8 @@ decode_options (int argc, char **argv)
       alt_display = "ns";
 #elif defined (HAVE_NTGUI)
       alt_display = "w32";
+#elif defined (HAVE_HAIKU)
+      alt_display = "be";
 #endif
 
       display = egetenv ("DISPLAY");