bug#27645: MacOS: run GUI Emacs without 'make install'

["Charles A. Roelli" <charles@aurox.ch>]

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The patch is attached.

Also, maybe there is a better way to find the file name of the icon to
use (without hardcoding the name).

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From 3cc9491d301be0030b9a4c85bb2cfa0507f7e243 Mon Sep 17 00:00:00 2001
From: Charles A. Roelli <charles@aurox.ch>
Date: Mon, 10 Jul 2017 21:08:14 +0200
Subject: [PATCH] Enable GUI Emacs without 'make install' on macOS (Bug
 #27645)

* nextstep/INSTALL: Correct it, and mention that Emacs can be run
from 'src/emacs'.

* src/nsterm.m (applicationDidFinishLaunching:): When Emacs is
launched outside of a macOS application bundle, change its
activation policy from the default 'prohibited' to 'regular'.

; * etc/NEWS: Mention the change on macOS.
---
 etc/NEWS         |    3 +++
 nextstep/INSTALL |   11 ++++++-----
 src/nsterm.m     |   11 +++++++++++
 3 files changed, 20 insertions(+), 5 deletions(-)

diff --git a/etc/NEWS b/etc/NEWS
index a00760c..e1e6e15 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -1516,6 +1516,9 @@ debugger has been attached to it.
 ** 'set-mouse-position' and 'set-mouse-absolute-pixel-position' work
 on macOS.
 
+** Emacs can now be run as a GUI application from the command line on
+macOS.
+
 \f
 ----------------------------------------------------------------------
 This file is part of GNU Emacs.
diff --git a/nextstep/INSTALL b/nextstep/INSTALL
index 799cd4d..9579987 100644
--- a/nextstep/INSTALL
+++ b/nextstep/INSTALL
@@ -17,14 +17,15 @@ Compilation
 
 In the top-level directory, use:
 
-  ./configure --with-ns
+  make
 
-(On macOS, --with-ns is enabled by default.)
+This will compile all the files.
 
-This will compile all the files, but emacs will not be able to be run except
-in -nw (terminal) mode.
+In order to run Emacs, you must run:
 
-In order to run Emacs.app, you must run:
+  src/emacs
+
+In order to install Emacs, you must run:
 
   make install
 
diff --git a/src/nsterm.m b/src/nsterm.m
index bf83550..c965e25 100644
--- a/src/nsterm.m
+++ b/src/nsterm.m
@@ -5479,6 +5479,17 @@ - (void)applicationDidFinishLaunching: (NSNotification *)notification
 	 object:nil];
 #endif
 
+  if ([NSApp activationPolicy] == NSApplicationActivationPolicyProhibited) {
+    /* Set the app's activation policy to regular when we run outside
+       of a bundle.  This is already done for us by Info.plist when we
+       run inside a bundle. */
+    [NSApp setActivationPolicy:NSApplicationActivationPolicyRegular];
+    [NSApp setApplicationIconImage:
+	     [EmacsImage
+	       allocInitFromFile:
+		 build_string("icons/hicolor/128x128/apps/emacs.png")]];
+  }
+
   ns_send_appdefined (-2);
 }
 
-- 
1.7.4.4