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Re: Emacs OS X GUI doesn't set locale

From: Alan Third
Subject: Re: Emacs OS X GUI doesn't set locale
Date: Thu, 28 Jan 2016 22:53:34 +0000
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/25.0.50 (darwin)

Paul Eggert <address@hidden> writes:

> On 01/26/2016 03:05 PM, Alan Third wrote:
> I looked around, and it appears the GnuCash ran into a similar
> problem. You might want to look at its solution, in:
> https://github.com/Gnucash/gnucash/blob/master/src/bin/gnucash-bin.c

I've had a look at that code and was initially worried at how much more
they have than I'd written, but I'm pretty sure that most of their code
is doing things that are done by mule in emacs.

One thing I don't understand is that they're building up the locale
value from the two parts (language and country code) when NSLocale
provides a function that does that for you. Makes me wonder if they know
something I don't.

They've also wrapped that bit of code in a try/catch as someone was
apparently getting a crash due to not having the country code set. I
can't replicate this, the only way I've found through Google is by using
XCode to unset the user's locale, and we don't use XCode.

I've put in a try/catch anyway, just in case.

>From b96c97cb16a980243389c01c10c5ab232fe6827e Mon Sep 17 00:00:00 2001
From: Alan Third <address@hidden>
Date: Thu, 28 Jan 2016 21:42:04 +0000
Subject: [PATCH] Set locale when run from OS X GUI

* src/emacs.c (main): Call ns_init_locale.
* src/nsterm.m (ns_init_locale): Get locale from OS and set LANG.
* src/nsterm.h: Include ns_init_locale.
 src/emacs.c  |  5 +++++
 src/nsterm.h |  2 ++
 src/nsterm.m | 21 +++++++++++++++++++++
 3 files changed, 28 insertions(+)

diff --git a/src/emacs.c b/src/emacs.c
index aaf058e..10e81d5 100644
--- a/src/emacs.c
+++ b/src/emacs.c
@@ -1378,6 +1378,11 @@ Using an Emacs configured with --with-x-toolkit=lucid 
does not have this problem
   init_ntproc (dumping); /* must precede init_editfns.  */
+#ifdef HAVE_NS
+  /* Initialise the locale from user defaults. */
+  ns_init_locale();
   /* Initialize and GC-protect Vinitial_environment and
      Vprocess_environment before set_initial_environment fills them
      in.  */
diff --git a/src/nsterm.h b/src/nsterm.h
index 6ca584e..fa5399c 100644
--- a/src/nsterm.h
+++ b/src/nsterm.h
@@ -1141,6 +1141,8 @@ extern void  ns_retain_object (void *obj);
 extern void *ns_alloc_autorelease_pool (void);
 extern void ns_release_autorelease_pool (void *);
 extern const char *ns_get_defaults_value (const char *key);
+extern void ns_init_locale (void);
 /* in nsmenu */
 extern void update_frame_tool_bar (struct frame *f);
diff --git a/src/nsterm.m b/src/nsterm.m
index b270e0e..4b04fd5 100644
--- a/src/nsterm.m
+++ b/src/nsterm.m
@@ -586,6 +586,27 @@ ns_load_path (void)
+ns_init_locale (void)
+/* OS X doesn't set any environment variables for the locale when run
+   from the GUI. Get the locale from the OS and set LANG. */
+  NSLocale *locale = [NSLocale currentLocale];
+  NSTRACE ("ns_init_locale");
+  @try
+    {
+      /* Set LANG to locale, but not if LANG is already set. */
+      setenv("LANG", [[locale localeIdentifier] UTF8String], 0);
+    }
+  @catch (NSException *e)
+    {
+      NSLog (@"Locale detection failed: %@: %@", [e name], [e reason]);
+    }
 ns_release_object (void *obj)
 /* --------------------------------------------------------------------------
     Release an object (callable from C)
2.5.4 (Apple Git-61)

Alan Third

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