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.

1 files changed, 13 insertions, 0 deletions

diff --git a/src/nsterm.m b/src/nsterm.m
index a3c7031331a..36d906a7cec 100644
--- a/src/nsterm.m
+++ b/src/nsterm.m
@@ -5497,6 +5497,19 @@ ns_term_shutdown (int sig)
          object:nil];
 #endif
 
+#ifdef NS_IMPL_COCOA
+  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")]];
+  }
+#endif
+
   ns_send_appdefined (-2);
 }