Add battery support to all Cygwin builds

It already exists in the Cygwin-w32 build.
* src/w32fns.c (Fw32_battery_status): Move to...
* src/w32cygwinx: New file, to be used for functions common to
the MS Windows and Cygwin builds.
(syms_of_w32cygwinx): New function.
* src/lisp.h: Add prototype of syms_of_w32cygwinx.
* src/emacs.c (main) [HAVE_NTGUI or CYGWIN]: Call syms_of_w32cygwinx.
* src/Makefile.in (SOME_MACHINE_OBJECTS):
* configure.ac (W32_OBJ) [HAVE_W32]: Add w32cygwinx.o.
(W32_LIBS) [CYGWIN]: Set equal to "-lkernel32" in non-w32 build.
(W32_OBJ) [CYGWIN]: Set equal to "w32cygwinx.o" in non-w32 build.
* etc/NEWS: Document the new battery support.

5 files changed, 154 insertions, 114 deletions

diff --git a/src/Makefile.in b/src/Makefile.in
index 2de888ada33..c84859cb4f1 100644
--- a/src/Makefile.in
+++ b/src/Makefile.in
@@ -277,11 +277,12 @@ NS_OBJC_OBJ=@NS_OBJC_OBJ@
 ## Used only for GNUstep.
 GNU_OBJC_CFLAGS=$(patsubst -specs=%-hardened-cc1,,@GNU_OBJC_CFLAGS@)
 ## w32fns.o w32menu.c w32reg.o fringe.o fontset.o w32font.o w32term.o
-## w32xfns.o w32select.o image.o w32uniscribe.o if HAVE_W32, else
-## empty.
+## w32xfns.o w32select.o image.o w32uniscribe.o w32cygwinx.o if HAVE_W32,
+## w32cygwinx.o if CYGWIN but not HAVE_W32, else empty.
 W32_OBJ=@W32_OBJ@
 ## -lkernel32 -luser32 -lusp10 -lgdi32 -lole32 -lcomdlg32 -lcomctl32
-## --lwinspool if HAVE_W32, else empty.
+## -lwinspool if HAVE_W32,
+## -lkernel32 if CYGWIN but not HAVE_W32, else empty.
 W32_LIBS=@W32_LIBS@
 
 ## emacs.res if HAVE_W32
@@ -412,7 +413,7 @@ SOME_MACHINE_OBJECTS = dosfns.o msdos.o \
   xterm.o xfns.o xmenu.o xselect.o xrdb.o xsmfns.o fringe.o image.o \
   fontset.o dbusbind.o cygw32.o \
   nsterm.o nsfns.o nsmenu.o nsselect.o nsimage.o nsfont.o macfont.o \
-  w32.o w32console.o w32fns.o w32heap.o w32inevt.o w32notify.o \
+  w32.o w32console.o w32cygwinx.o w32fns.o w32heap.o w32inevt.o w32notify.o \
   w32menu.o w32proc.o w32reg.o w32select.o w32term.o w32xfns.o \
   w16select.o widget.o xfont.o ftfont.o xftfont.o ftxfont.o gtkutil.o \
   xsettings.o xgselect.o termcap.o
diff --git a/src/emacs.c b/src/emacs.c
index 20ced262835..84cd3ac8c8a 100644
--- a/src/emacs.c
+++ b/src/emacs.c
@@ -1566,6 +1566,10 @@ Using an Emacs configured with --with-x-toolkit=lucid does not have this problem
       syms_of_fontset ();
 #endif /* HAVE_NTGUI */
 
+#if defined HAVE_NTGUI || defined CYGWIN
+      syms_of_w32cygwinx ();
+#endif
+
 #if defined WINDOWSNT || defined HAVE_NTGUI
       syms_of_w32select ();
 #endif
diff --git a/src/lisp.h b/src/lisp.h
index 3eb6e0d3c1d..616aea07805 100644
--- a/src/lisp.h
+++ b/src/lisp.h
@@ -4482,6 +4482,11 @@ extern void syms_of_gfilenotify (void);
 extern void syms_of_w32notify (void);
 #endif
 
+#if defined HAVE_NTGUI || defined CYGWIN
+/* Defined in w32cygwinx.c.  */
+extern void syms_of_w32cygwinx (void);
+#endif
+
 /* Defined in xfaces.c.  */
 extern Lisp_Object Vface_alternative_font_family_alist;
 extern Lisp_Object Vface_alternative_font_registry_alist;
diff --git a/src/w32cygwinx.c b/src/w32cygwinx.c
new file mode 100644
index 00000000000..8d3ae164cf6
--- /dev/null
+++ b/src/w32cygwinx.c
@@ -0,0 +1,140 @@
+/* Common functions for the Microsoft Windows and Cygwin builds.
+
+Copyright (C) 2018 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 <stdio.h>
+
+#include "lisp.h"
+#include "w32common.h"
+
+DEFUN ("w32-battery-status", Fw32_battery_status, Sw32_battery_status, 0, 0, 0,
+       doc: /* Get power status information from Windows system.
+
+The following %-sequences are provided:
+%L AC line status (verbose)
+%B Battery status (verbose)
+%b Battery status, empty means high, `-' means low,
+   `!' means critical, and `+' means charging
+%p Battery load percentage
+%s Remaining time (to charge or discharge) in seconds
+%m Remaining time (to charge or discharge) in minutes
+%h Remaining time (to charge or discharge) in hours
+%t Remaining time (to charge or discharge) in the form `h:min'  */)
+  (void)
+{
+  Lisp_Object status = Qnil;
+
+  SYSTEM_POWER_STATUS system_status;
+  if (GetSystemPowerStatus (&system_status))
+    {
+      Lisp_Object line_status, battery_status, battery_status_symbol;
+      Lisp_Object load_percentage, seconds, minutes, hours, remain;
+
+      long seconds_left = (long) system_status.BatteryLifeTime;
+
+      if (system_status.ACLineStatus == 0)
+        line_status = build_string ("off-line");
+      else if (system_status.ACLineStatus == 1)
+        line_status = build_string ("on-line");
+      else
+        line_status = build_string ("N/A");
+
+      if (system_status.BatteryFlag & 128)
+        {
+          battery_status = build_string ("N/A");
+          battery_status_symbol = empty_unibyte_string;
+        }
+      else if (system_status.BatteryFlag & 8)
+        {
+          battery_status = build_string ("charging");
+          battery_status_symbol = build_string ("+");
+          if (system_status.BatteryFullLifeTime != -1L)
+            seconds_left = system_status.BatteryFullLifeTime - seconds_left;
+        }
+      else if (system_status.BatteryFlag & 4)
+        {
+          battery_status = build_string ("critical");
+          battery_status_symbol = build_string ("!");
+        }
+      else if (system_status.BatteryFlag & 2)
+        {
+          battery_status = build_string ("low");
+          battery_status_symbol = build_string ("-");
+        }
+      else if (system_status.BatteryFlag & 1)
+        {
+          battery_status = build_string ("high");
+          battery_status_symbol = empty_unibyte_string;
+        }
+      else
+        {
+          battery_status = build_string ("medium");
+          battery_status_symbol = empty_unibyte_string;
+        }
+
+      if (system_status.BatteryLifePercent > 100)
+        load_percentage = build_string ("N/A");
+      else
+        {
+          char buffer[16];
+          snprintf (buffer, 16, "%d", system_status.BatteryLifePercent);
+          load_percentage = build_string (buffer);
+        }
+
+      if (seconds_left < 0)
+        seconds = minutes = hours = remain = build_string ("N/A");
+      else
+        {
+          long m;
+          double h;
+          char buffer[16];
+          snprintf (buffer, 16, "%ld", seconds_left);
+          seconds = build_string (buffer);
+
+          m = seconds_left / 60;
+          snprintf (buffer, 16, "%ld", m);
+          minutes = build_string (buffer);
+
+          h = seconds_left / 3600.0;
+          snprintf (buffer, 16, "%3.1f", h);
+          hours = build_string (buffer);
+
+          snprintf (buffer, 16, "%ld:%02ld", m / 60, m % 60);
+          remain = build_string (buffer);
+        }
+
+      status = listn (CONSTYPE_HEAP, 8,
+                      Fcons (make_number ('L'), line_status),
+                      Fcons (make_number ('B'), battery_status),
+                      Fcons (make_number ('b'), battery_status_symbol),
+                      Fcons (make_number ('p'), load_percentage),
+                      Fcons (make_number ('s'), seconds),
+                      Fcons (make_number ('m'), minutes),
+                      Fcons (make_number ('h'), hours),
+                      Fcons (make_number ('t'), remain));
+    }
+  return status;
+}
+
+void
+syms_of_w32cygwinx (void)
+{
+  defsubr (&Sw32_battery_status);
+}
diff --git a/src/w32fns.c b/src/w32fns.c
index ed375cddbef..6e0b3adf160 100644
--- a/src/w32fns.c
+++ b/src/w32fns.c
@@ -9213,115 +9213,6 @@ The coordinates X and Y are interpreted in pixels relative to a position
   return Qnil;
 }
 
-DEFUN ("w32-battery-status", Fw32_battery_status, Sw32_battery_status, 0, 0, 0,
-       doc: /* Get power status information from Windows system.
-
-The following %-sequences are provided:
-%L AC line status (verbose)
-%B Battery status (verbose)
-%b Battery status, empty means high, `-' means low,
-   `!' means critical, and `+' means charging
-%p Battery load percentage
-%s Remaining time (to charge or discharge) in seconds
-%m Remaining time (to charge or discharge) in minutes
-%h Remaining time (to charge or discharge) in hours
-%t Remaining time (to charge or discharge) in the form `h:min'  */)
-  (void)
-{
-  Lisp_Object status = Qnil;
-
-  SYSTEM_POWER_STATUS system_status;
-  if (GetSystemPowerStatus (&system_status))
-    {
-      Lisp_Object line_status, battery_status, battery_status_symbol;
-      Lisp_Object load_percentage, seconds, minutes, hours, remain;
-
-      long seconds_left = (long) system_status.BatteryLifeTime;
-
-      if (system_status.ACLineStatus == 0)
-        line_status = build_string ("off-line");
-      else if (system_status.ACLineStatus == 1)
-        line_status = build_string ("on-line");
-      else
-        line_status = build_string ("N/A");
-
-      if (system_status.BatteryFlag & 128)
-        {
-          battery_status = build_string ("N/A");
-          battery_status_symbol = empty_unibyte_string;
-        }
-      else if (system_status.BatteryFlag & 8)
-        {
-          battery_status = build_string ("charging");
-          battery_status_symbol = build_string ("+");
-          if (system_status.BatteryFullLifeTime != -1L)
-            seconds_left = system_status.BatteryFullLifeTime - seconds_left;
-        }
-      else if (system_status.BatteryFlag & 4)
-        {
-          battery_status = build_string ("critical");
-          battery_status_symbol = build_string ("!");
-        }
-      else if (system_status.BatteryFlag & 2)
-        {
-          battery_status = build_string ("low");
-          battery_status_symbol = build_string ("-");
-        }
-      else if (system_status.BatteryFlag & 1)
-        {
-          battery_status = build_string ("high");
-          battery_status_symbol = empty_unibyte_string;
-        }
-      else
-        {
-          battery_status = build_string ("medium");
-          battery_status_symbol = empty_unibyte_string;
-        }
-
-      if (system_status.BatteryLifePercent > 100)
-        load_percentage = build_string ("N/A");
-      else
-        {
-          char buffer[16];
-          snprintf (buffer, 16, "%d", system_status.BatteryLifePercent);
-          load_percentage = build_string (buffer);
-        }
-
-      if (seconds_left < 0)
-        seconds = minutes = hours = remain = build_string ("N/A");
-      else
-        {
-          long m;
-          double h;
-          char buffer[16];
-          snprintf (buffer, 16, "%ld", seconds_left);
-          seconds = build_string (buffer);
-
-          m = seconds_left / 60;
-          snprintf (buffer, 16, "%ld", m);
-          minutes = build_string (buffer);
-
-          h = seconds_left / 3600.0;
-          snprintf (buffer, 16, "%3.1f", h);
-          hours = build_string (buffer);
-
-          snprintf (buffer, 16, "%ld:%02ld", m / 60, m % 60);
-          remain = build_string (buffer);
-        }
-
-      status = listn (CONSTYPE_HEAP, 8,
-                      Fcons (make_number ('L'), line_status),
-                      Fcons (make_number ('B'), battery_status),
-                      Fcons (make_number ('b'), battery_status_symbol),
-                      Fcons (make_number ('p'), load_percentage),
-                      Fcons (make_number ('s'), seconds),
-                      Fcons (make_number ('m'), minutes),
-                      Fcons (make_number ('h'), hours),
-                      Fcons (make_number ('t'), remain));
-    }
-  return status;
-}
-
 
 #ifdef WINDOWSNT
 typedef BOOL (WINAPI *GetDiskFreeSpaceExW_Proc)
@@ -10786,7 +10677,6 @@ tip frame.  */);
   defsubr (&Sw32_reconstruct_hot_key);
   defsubr (&Sw32_toggle_lock_key);
   defsubr (&Sw32_window_exists_p);
-  defsubr (&Sw32_battery_status);
   defsubr (&Sw32__menu_bar_in_use);
 #if defined WINDOWSNT && !defined HAVE_DBUS
   defsubr (&Sw32_notification_notify);