osdep: add mp_get_user_langs

meson.build

@@ -385,6 +385,7 @@ features += {'cocoa': cocoa.found()}
 if features['cocoa']
     dependencies += cocoa
     sources += files('osdep/apple_utils.c',
+                     'osdep/language-apple.c',
                      'osdep/macosx_application.m',
                      'osdep/macosx_events.m',
                      'osdep/macosx_menubar.m',
@@ -407,7 +408,8 @@ if posix
 endif
 
 if posix and not features['cocoa']
-    sources += files('osdep/main-fn-unix.c')
+    sources += files('osdep/main-fn-unix.c',
+                     'osdep/language-posix.c')
 endif
 
 if darwin
@@ -492,6 +494,7 @@ if features['win32-desktop']
     subprocess_source = files('osdep/subprocess-win.c')
     sources += path_source + subprocess_source + \
                files('input/ipc-win.c',
+                     'osdep/language-win.c',
                      'osdep/main-fn-win.c',
                      'osdep/terminal-win.c',
                      'video/out/w32_common.c',

misc/language.h

@@ -26,4 +26,6 @@
 // Where applicable, l1 is the user-specified code and l2 is the code being checked against it
 int mp_match_lang_single(const char *l1, const char *l2);
 
+char **mp_get_user_langs(void);
+
 #endif /* MP_LANGUAGE_H */

osdep/language-apple.c

@@ -0,0 +1,45 @@
+/*
+ * User language lookup for Apple platforms
+ *
+ * This file is part of mpv.
+ *
+ * mpv is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * mpv 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 Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with mpv.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "misc/language.h"
+
+#include "apple_utils.h"
+#include "mpv_talloc.h"
+
+char **mp_get_user_langs(void)
+{
+    CFArrayRef arr = CFLocaleCopyPreferredLanguages();
+    if (!arr)
+        return NULL;
+    CFIndex count = CFArrayGetCount(arr);
+    if (!count)
+        return NULL;
+
+    char **ret = talloc_array_ptrtype(NULL, ret, count + 1);
+
+    for (CFIndex i = 0; i < count; i++) {
+        CFStringRef cfstr = CFArrayGetValueAtIndex(arr, i);
+        ret[i] = talloc_steal(ret, cfstr_get_cstr(cfstr));
+    }
+
+    ret[count] = NULL;
+
+    CFRelease(arr);
+    return ret;
+}

osdep/language-posix.c

@@ -0,0 +1,61 @@
+/*
+ * User language lookup for generic POSIX platforms
+ *
+ * This file is part of mpv.
+ *
+ * mpv is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * mpv 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 Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with mpv.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "misc/language.h"
+#include "mpv_talloc.h"
+
+#include <stddef.h>
+
+char **mp_get_user_langs(void)
+{
+    static const char *const list[] = {
+        "LC_ALL",
+        "LC_MESSAGES",
+        "LANG",
+        NULL
+    };
+
+    size_t nb = 0;
+    char **ret = NULL;
+
+    // Prefer anything we get from LANGUAGE first
+    for (const char *langList = getenv("LANGUAGE"); langList && *langList;) {
+        size_t len = strcspn(langList, ":");
+        MP_TARRAY_GROW(NULL, ret, nb);
+        ret[nb++] = talloc_strndup(ret, langList, len);
+        langList += len;
+        while (*langList == ':')
+            langList++;
+    }
+
+    // Then, the language components of other relevant locale env vars
+    for (int i = 0; list[i]; i++) {
+        const char *envval = getenv(list[i]);
+        if (envval && *envval) {
+            size_t len = strcspn(envval, ".@");
+            MP_TARRAY_GROW(NULL, ret, nb);
+            ret[nb++] = talloc_strndup(ret, envval, len);
+        }
+    }
+
+    // Null-terminate the list
+    MP_TARRAY_APPEND(NULL, ret, nb, NULL);
+
+    return ret;
+}

osdep/language-win.c

@@ -0,0 +1,65 @@
+/*
+ * User language lookup for win32
+ *
+ * This file is part of mpv.
+ *
+ * mpv is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * mpv 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 Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with mpv.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "misc/language.h"
+#include "mpv_talloc.h"
+#include "osdep/io.h"
+
+#include <windows.h>
+
+char **mp_get_user_langs(void)
+{
+    size_t nb = 0;
+    char **ret = NULL;
+    ULONG got_count = 0;
+    ULONG got_size = 0;
+    if (!GetUserPreferredUILanguages(MUI_LANGUAGE_NAME, &got_count, NULL, &got_size) ||
+        got_size == 0)
+        return NULL;
+
+    wchar_t *buf = talloc_array(NULL, wchar_t, got_size);
+
+    if (!GetUserPreferredUILanguages(MUI_LANGUAGE_NAME, &got_count, buf, &got_size) ||
+        got_size == 0)
+        goto cleanup;
+
+    for (ULONG pos = 0; buf[pos]; pos += wcslen(buf + pos) + 1) {
+        ret = talloc_realloc(NULL, ret, char*, (nb + 2));
+        ret[nb++] = mp_to_utf8(ret, buf + pos);
+    }
+    ret[nb] = NULL;
+
+    if (!GetSystemPreferredUILanguages(MUI_LANGUAGE_NAME, &got_count, NULL, &got_size))
+        goto cleanup;
+
+    buf = talloc_realloc(NULL, buf, wchar_t, got_size);
+
+    if (!GetSystemPreferredUILanguages(MUI_LANGUAGE_NAME, &got_count, buf, &got_size))
+        goto cleanup;
+
+    for (ULONG pos = 0; buf[pos]; pos += wcslen(buf + pos) + 1) {
+        ret = talloc_realloc(NULL, ret, char*, (nb + 2));
+        ret[nb++] = mp_to_utf8(ret, buf + pos);
+    }
+    ret[nb] = NULL;
+
+cleanup:
+    talloc_free(buf);
+    return ret;
+}

wscript_build.py

@@ -249,6 +249,12 @@ def build(ctx):
         ( "osdep/subprocess-dummy.c" ),
     ])
 
+    language_c = ctx.pick_first_matching_dep([
+        ( "osdep/language-apple.c",              "cocoa" ),
+        ( "osdep/language-win.c",                "win32-desktop" ),
+        ( "osdep/language-posix.c" ),
+    ])
+
     sources = [
         ## Audio
         ( "audio/aframe.c" ),
@@ -581,6 +587,8 @@ def build(ctx):
         ( timer_c ),
         ( "osdep/polldev.c",                     "posix" ),
 
+        ( language_c ),
+
         ( "osdep/android/strnlen.c",             "android"),
         ( "osdep/apple_utils.c",                 "cocoa" ),
         ( "osdep/glob-win.c",                    "glob-win32" ),