NLS: Put list of available languages into LINGUAS files

This moves the list of available languages from nls.mk into a separate
file called po/LINGUAS.  Advantages:

- It keeps the parts notionally managed by programmers (nls.mk)
  separate from the parts notionally managed by translators (LINGUAS).

- It's the standard practice recommended by the Gettext manual
  nowadays.

- The Meson build system also supports this layout (and of course
  doesn't know anything about our custom nls.mk), so this would enable
  sharing the list of languages between the two build systems.

(The MSVC build system currently finds all po files by globbing, so it
is not affected by this change.)

Reviewed-by: Andres Freund <andres@anarazel.de>
Discussion: https://www.postgresql.org/message-id/flat/557a9f5c-e871-edc7-2f58-a4140fb65b7b@enterprisedb.com

doc/src/sgml/nls.sgml

@@ -175,10 +175,11 @@ make init-po
     Copy this file to
     <filename><replaceable>language</replaceable>.po</filename> and
     edit it.  To make it known that the new language is available,
-    also edit the file <filename>nls.mk</filename> and add the
-    language (or language and country) code to the line that looks like:
+    also edit the file <filename>po/LINGUAS</filename> and add the
+    language (or language and country) code next to languages already listed,
+    like:
 <programlisting>
-AVAIL_LANGUAGES := de fr
+de fr
 </programlisting>
     (Other languages can appear, of course.)
    </para>
@@ -375,16 +376,6 @@ fprintf(stderr, gettext("panic level %d\n"), lvl);
        </listitem>
       </varlistentry>
 
-      <varlistentry>
-       <term><varname>AVAIL_LANGUAGES</varname></term>
-
-       <listitem>
-        <para>
-         List of provided translations &mdash; initially empty.
-        </para>
-       </listitem>
-      </varlistentry>
-
       <varlistentry>
        <term><varname>GETTEXT_FILES</varname></term>
 
@@ -424,6 +415,12 @@ fprintf(stderr, gettext("panic level %d\n"), lvl);
     </para>
    </step>
 
+   <step>
+    <para>
+     Add a file <filename>po/LINGUAS</filename>, which will contain the list
+     of provided translations &mdash; initially empty.
+    </para>
+   </step>
   </procedure>
 
   <para>

src/backend/nls.mk

@@ -1,6 +1,5 @@
 # src/backend/nls.mk
 CATALOG_NAME     = postgres
-AVAIL_LANGUAGES  = de es fr id it ja ko pl pt_BR ru sv tr uk zh_CN
 GETTEXT_FILES    = + gettext-files
 GETTEXT_TRIGGERS = $(BACKEND_COMMON_GETTEXT_TRIGGERS) \
     GUC_check_errmsg \

src/backend/po/LINGUAS

@@ -0,0 +1 @@
+de es fr id it ja ko pl pt_BR ru sv tr uk zh_CN

src/bin/initdb/nls.mk

@@ -1,6 +1,5 @@
 # src/bin/initdb/nls.mk
 CATALOG_NAME     = initdb
-AVAIL_LANGUAGES  = cs de el es fr he it ja ko pl pt_BR ru sv tr uk vi zh_CN
 GETTEXT_FILES    = $(FRONTEND_COMMON_GETTEXT_FILES) findtimezone.c initdb.c ../../common/exec.c ../../common/fe_memutils.c ../../common/file_utils.c ../../common/pgfnames.c ../../common/restricted_token.c ../../common/rmtree.c ../../common/username.c ../../common/wait_error.c ../../port/dirmod.c
 GETTEXT_TRIGGERS = $(FRONTEND_COMMON_GETTEXT_TRIGGERS) simple_prompt
 GETTEXT_FLAGS    = $(FRONTEND_COMMON_GETTEXT_FLAGS)

src/bin/initdb/po/LINGUAS

@@ -0,0 +1 @@
+cs de el es fr he it ja ko pl pt_BR ru sv tr uk vi zh_CN

src/bin/pg_amcheck/nls.mk

@@ -1,6 +1,5 @@
 # src/bin/pg_amcheck/nls.mk
 CATALOG_NAME     = pg_amcheck
-AVAIL_LANGUAGES  = de el es fr ja ru sv uk zh_CN
 GETTEXT_FILES    = $(FRONTEND_COMMON_GETTEXT_FILES) \
                    pg_amcheck.c \
                    ../../fe_utils/cancel.c \

src/bin/pg_amcheck/po/LINGUAS

@@ -0,0 +1 @@
+de el es fr ja ru sv uk zh_CN

src/bin/pg_archivecleanup/nls.mk

@@ -1,6 +1,5 @@
 # src/bin/pg_archivecleanup/nls.mk
 CATALOG_NAME     = pg_archivecleanup
-AVAIL_LANGUAGES  = cs de el es fr ja ko pl ru sv tr uk vi zh_CN
 GETTEXT_FILES    = $(FRONTEND_COMMON_GETTEXT_FILES) pg_archivecleanup.c
 GETTEXT_TRIGGERS = $(FRONTEND_COMMON_GETTEXT_TRIGGERS)
 GETTEXT_FLAGS    = $(FRONTEND_COMMON_GETTEXT_FLAGS)

src/bin/pg_archivecleanup/po/LINGUAS

@@ -0,0 +1 @@
+cs de el es fr ja ko pl ru sv tr uk vi zh_CN

src/bin/pg_basebackup/nls.mk

@@ -1,6 +1,5 @@
 # src/bin/pg_basebackup/nls.mk
 CATALOG_NAME     = pg_basebackup
-AVAIL_LANGUAGES  = cs de es fr he it ja ko pl pt_BR ru sv tr uk vi zh_CN
 GETTEXT_FILES    = $(FRONTEND_COMMON_GETTEXT_FILES) \
                    bbstreamer_file.c \
                    bbstreamer_gzip.c \

src/bin/pg_basebackup/po/LINGUAS

@@ -0,0 +1 @@
+cs de es fr he it ja ko pl pt_BR ru sv tr uk vi zh_CN

src/bin/pg_checksums/nls.mk

@@ -1,6 +1,5 @@
 # src/bin/pg_checksums/nls.mk
 CATALOG_NAME     = pg_checksums
-AVAIL_LANGUAGES  = cs de el es fr ja ko ru sv tr uk zh_CN
 GETTEXT_FILES    = $(FRONTEND_COMMON_GETTEXT_FILES) \
                    pg_checksums.c \
                    ../../fe_utils/option_utils.c

src/bin/pg_checksums/po/LINGUAS

@@ -0,0 +1 @@
+cs de el es fr ja ko ru sv tr uk zh_CN

src/bin/pg_config/nls.mk

@@ -1,4 +1,3 @@
 # src/bin/pg_config/nls.mk
 CATALOG_NAME     = pg_config
-AVAIL_LANGUAGES  = cs de el es fr he it ja ko nb pl pt_BR ro ru sv ta tr uk vi zh_CN zh_TW
 GETTEXT_FILES    = pg_config.c ../../common/config_info.c ../../common/exec.c

src/bin/pg_config/po/LINGUAS

@@ -0,0 +1 @@
+cs de el es fr he it ja ko nb pl pt_BR ro ru sv ta tr uk vi zh_CN zh_TW

src/bin/pg_controldata/nls.mk

@@ -1,6 +1,5 @@
 # src/bin/pg_controldata/nls.mk
 CATALOG_NAME     = pg_controldata
-AVAIL_LANGUAGES  = cs de el es fr it ja ko pl pt_BR ru sv tr uk vi zh_CN
 GETTEXT_FILES    = pg_controldata.c ../../common/controldata_utils.c
 GETTEXT_TRIGGERS = $(FRONTEND_COMMON_GETTEXT_TRIGGERS)
 GETTEXT_FLAGS    = $(FRONTEND_COMMON_GETTEXT_FLAGS)

src/bin/pg_controldata/po/LINGUAS

@@ -0,0 +1 @@
+cs de el es fr it ja ko pl pt_BR ru sv tr uk vi zh_CN

src/bin/pg_ctl/nls.mk

@@ -1,4 +1,3 @@
 # src/bin/pg_ctl/nls.mk
 CATALOG_NAME     = pg_ctl
-AVAIL_LANGUAGES  = cs de el es fr he it ja ko pl pt_BR ru sv tr uk zh_CN
 GETTEXT_FILES    = pg_ctl.c ../../common/exec.c ../../common/fe_memutils.c ../../common/wait_error.c ../../port/path.c

src/bin/pg_ctl/po/LINGUAS

@@ -0,0 +1 @@
+cs de el es fr he it ja ko pl pt_BR ru sv tr uk zh_CN

src/bin/pg_dump/nls.mk

@@ -1,6 +1,5 @@
 # src/bin/pg_dump/nls.mk
 CATALOG_NAME     = pg_dump
-AVAIL_LANGUAGES  = cs de el es fr he it ja ko pl pt_BR ru sv tr uk zh_CN
 GETTEXT_FILES    = $(FRONTEND_COMMON_GETTEXT_FILES) \
                    pg_backup_archiver.c pg_backup_db.c pg_backup_custom.c \
                    pg_backup_null.c pg_backup_tar.c \

src/bin/pg_dump/po/LINGUAS

@@ -0,0 +1 @@
+cs de el es fr he it ja ko pl pt_BR ru sv tr uk zh_CN

src/bin/pg_resetwal/nls.mk

@@ -1,6 +1,5 @@
 # src/bin/pg_resetwal/nls.mk
 CATALOG_NAME     = pg_resetwal
-AVAIL_LANGUAGES  = cs de el es fr it ja ko pl pt_BR ru sv tr uk zh_CN
 GETTEXT_FILES    = $(FRONTEND_COMMON_GETTEXT_FILES) pg_resetwal.c ../../common/restricted_token.c
 GETTEXT_TRIGGERS = $(FRONTEND_COMMON_GETTEXT_TRIGGERS)
 GETTEXT_FLAGS    = $(FRONTEND_COMMON_GETTEXT_FLAGS)

src/bin/pg_resetwal/po/LINGUAS

@@ -0,0 +1 @@
+cs de el es fr it ja ko pl pt_BR ru sv tr uk zh_CN

src/bin/pg_rewind/nls.mk

@@ -1,6 +1,5 @@
 # src/bin/pg_rewind/nls.mk
 CATALOG_NAME     = pg_rewind
-AVAIL_LANGUAGES  = cs de el es fr it ja ko pl pt_BR ru sv tr uk zh_CN
 GETTEXT_FILES    = $(FRONTEND_COMMON_GETTEXT_FILES) datapagemap.c file_ops.c filemap.c libpq_source.c local_source.c parsexlog.c pg_rewind.c timeline.c xlogreader.c ../../common/fe_memutils.c ../../common/restricted_token.c ../../fe_utils/archive.c ../../fe_utils/recovery_gen.c
 GETTEXT_TRIGGERS = $(FRONTEND_COMMON_GETTEXT_TRIGGERS) report_invalid_record:2
 GETTEXT_FLAGS    = $(FRONTEND_COMMON_GETTEXT_FLAGS) \

src/bin/pg_rewind/po/LINGUAS

@@ -0,0 +1 @@
+cs de el es fr it ja ko pl pt_BR ru sv tr uk zh_CN

src/bin/pg_test_fsync/nls.mk

@@ -1,6 +1,5 @@
 # src/bin/pg_test_fsync/nls.mk
 CATALOG_NAME     = pg_test_fsync
-AVAIL_LANGUAGES  = cs de el es fr ja ko pl ru sv tr uk vi zh_CN
 GETTEXT_FILES    = $(FRONTEND_COMMON_GETTEXT_FILES) pg_test_fsync.c
 GETTEXT_TRIGGERS = $(FRONTEND_COMMON_GETTEXT_TRIGGERS) die
 GETTEXT_FLAGS    = $(FRONTEND_COMMON_GETTEXT_FLAGS)

src/bin/pg_test_fsync/po/LINGUAS

@@ -0,0 +1 @@
+cs de el es fr ja ko pl ru sv tr uk vi zh_CN

src/bin/pg_test_timing/nls.mk

@@ -1,4 +1,3 @@
 # src/bin/pg_test_timing/nls.mk
 CATALOG_NAME     = pg_test_timing
-AVAIL_LANGUAGES  = cs de el es fr ja ko pl ru sv tr uk vi zh_CN
 GETTEXT_FILES    = pg_test_timing.c

src/bin/pg_test_timing/po/LINGUAS

@@ -0,0 +1 @@
+cs de el es fr ja ko pl ru sv tr uk vi zh_CN

src/bin/pg_upgrade/nls.mk

@@ -1,6 +1,5 @@
 # src/bin/pg_upgrade/nls.mk
 CATALOG_NAME     = pg_upgrade
-AVAIL_LANGUAGES  = cs de es fr ja ko ru sv tr uk zh_CN
 GETTEXT_FILES    = check.c controldata.c dump.c exec.c file.c function.c \
                    info.c option.c parallel.c pg_upgrade.c relfilenode.c \
                    server.c tablespace.c util.c version.c

src/bin/pg_upgrade/po/LINGUAS

@@ -0,0 +1 @@
+cs de es fr ja ko ru sv tr uk zh_CN

src/bin/pg_verifybackup/nls.mk

@@ -1,6 +1,5 @@
 # src/bin/pg_verifybackup/nls.mk
 CATALOG_NAME     = pg_verifybackup
-AVAIL_LANGUAGES  = de el es fr ja ko ru sv uk zh_CN
 GETTEXT_FILES    = $(FRONTEND_COMMON_GETTEXT_FILES) \
                    parse_manifest.c \
                    pg_verifybackup.c \

src/bin/pg_verifybackup/po/LINGUAS

@@ -0,0 +1 @@
+de el es fr ja ko ru sv uk zh_CN

src/bin/pg_waldump/nls.mk

@@ -1,6 +1,5 @@
 # src/bin/pg_waldump/nls.mk
 CATALOG_NAME     = pg_waldump
-AVAIL_LANGUAGES  = cs de el es fr ja ko ru sv tr uk vi zh_CN
 GETTEXT_FILES    = $(FRONTEND_COMMON_GETTEXT_FILES) pg_waldump.c
 GETTEXT_TRIGGERS = $(FRONTEND_COMMON_GETTEXT_TRIGGERS)
 GETTEXT_FLAGS    = $(FRONTEND_COMMON_GETTEXT_FLAGS)

src/bin/pg_waldump/po/LINGUAS

@@ -0,0 +1 @@
+cs de el es fr ja ko ru sv tr uk vi zh_CN

src/bin/psql/nls.mk

@@ -1,6 +1,5 @@
 # src/bin/psql/nls.mk
 CATALOG_NAME     = psql
-AVAIL_LANGUAGES  = cs de el es fr he it ja ko pl pt_BR ru sv tr uk zh_CN zh_TW
 GETTEXT_FILES    = $(FRONTEND_COMMON_GETTEXT_FILES) \
                    command.c common.c copy.c crosstabview.c help.c input.c large_obj.c \
                    mainloop.c psqlscanslash.c startup.c \

src/bin/psql/po/LINGUAS

@@ -0,0 +1 @@
+cs de el es fr he it ja ko pl pt_BR ru sv tr uk zh_CN zh_TW

src/bin/scripts/nls.mk

@@ -1,6 +1,5 @@
 # src/bin/scripts/nls.mk
 CATALOG_NAME     = pgscripts
-AVAIL_LANGUAGES  = cs de el es fr he it ja ko pl pt_BR ru sv tr uk zh_CN
 GETTEXT_FILES    = $(FRONTEND_COMMON_GETTEXT_FILES) \
                    createdb.c createuser.c \
                    dropdb.c dropuser.c \

src/bin/scripts/po/LINGUAS

@@ -0,0 +1 @@
+cs de el es fr he it ja ko pl pt_BR ru sv tr uk zh_CN

src/interfaces/ecpg/ecpglib/nls.mk

@@ -1,6 +1,5 @@
 # src/interfaces/ecpg/ecpglib/nls.mk
 CATALOG_NAME     = ecpglib
-AVAIL_LANGUAGES  = cs de el es fr it ja ko pl pt_BR ru sv tr uk vi zh_CN
 GETTEXT_FILES    = connect.c descriptor.c error.c execute.c misc.c
 GETTEXT_TRIGGERS = ecpg_gettext
 GETTEXT_FLAGS    = ecpg_gettext:1:pass-c-format

src/interfaces/ecpg/ecpglib/po/LINGUAS

@@ -0,0 +1 @@
+cs de el es fr it ja ko pl pt_BR ru sv tr uk vi zh_CN

src/interfaces/ecpg/preproc/nls.mk

@@ -1,6 +1,5 @@
 # src/interfaces/ecpg/preproc/nls.mk
 CATALOG_NAME     = ecpg
-AVAIL_LANGUAGES  = cs de el es fr it ja ko pl pt_BR ru sv tr uk vi zh_CN zh_TW
 GETTEXT_FILES    = descriptor.c ecpg.c pgc.c preproc.c type.c variable.c
 GETTEXT_TRIGGERS = mmerror:3 mmfatal:2
 GETTEXT_FLAGS    = mmerror:3:c-format mmfatal:2:c-format

src/interfaces/ecpg/preproc/po/LINGUAS

@@ -0,0 +1 @@
+cs de el es fr it ja ko pl pt_BR ru sv tr uk vi zh_CN zh_TW

src/interfaces/libpq/nls.mk

@@ -1,6 +1,5 @@
 # src/interfaces/libpq/nls.mk
 CATALOG_NAME     = libpq
-AVAIL_LANGUAGES  = cs de el es fr he it ja ko pl pt_BR ru sv tr uk zh_CN zh_TW
 GETTEXT_FILES    = fe-auth.c fe-auth-scram.c fe-connect.c fe-exec.c fe-gssapi-common.c fe-lobj.c fe-misc.c fe-protocol3.c fe-secure.c fe-secure-common.c fe-secure-gssapi.c fe-secure-openssl.c win32.c ../../port/thread.c
 GETTEXT_TRIGGERS = libpq_gettext pqInternalNotice:2
 GETTEXT_FLAGS    = libpq_gettext:1:pass-c-format pqInternalNotice:2:c-format

src/interfaces/libpq/po/LINGUAS

@@ -0,0 +1 @@
+cs de el es fr he it ja ko pl pt_BR ru sv tr uk zh_CN zh_TW

src/nls-global.mk

@@ -8,7 +8,6 @@
 #
 # CATALOG_NAME          -- name of the message catalog (xxx.po); probably
 #                          name of the program
-# AVAIL_LANGUAGES       -- list of languages that are provided/supported
 # GETTEXT_FILES         -- list of source files that contain message strings
 # GETTEXT_TRIGGERS      -- (optional) list of functions that contain
 #                          translatable strings
@@ -16,6 +15,9 @@
 #                          function arguments that contain C format strings
 #                          (functions must be listed in TRIGGERS and FLAGS)
 #
+# Also, provide a text file 'po/LINGUAS' with a space-separated list
+# of languages that are provided/supported.
+#
 # That's all, the rest is done here, if --enable-nls was specified.
 #
 # The only user-visible targets here are 'init-po', to make an initial
@@ -27,6 +29,8 @@
 # existence checked by Makefile.global; otherwise we won't get here
 include $(srcdir)/nls.mk
 
+AVAIL_LANGUAGES := $(shell sed -e "/^#/d" -e "s/#.*//" po/LINGUAS)
+
 # If user specified the languages he wants in --enable-nls=LANGUAGES,
 # filter out the rest.  Else use all available ones.
 ifdef WANTED_LANGUAGES

src/pl/plperl/nls.mk

@@ -1,6 +1,5 @@
 # src/pl/plperl/nls.mk
 CATALOG_NAME     = plperl
-AVAIL_LANGUAGES  = cs de el es fr it ja ko pl pt_BR ro ru sv tr uk vi zh_CN zh_TW
 GETTEXT_FILES    = plperl.c SPI.c
 GETTEXT_TRIGGERS = $(BACKEND_COMMON_GETTEXT_TRIGGERS)
 GETTEXT_FLAGS    = $(BACKEND_COMMON_GETTEXT_FLAGS)

src/pl/plperl/po/LINGUAS

@@ -0,0 +1 @@
+cs de el es fr it ja ko pl pt_BR ro ru sv tr uk vi zh_CN zh_TW

src/pl/plpgsql/src/nls.mk

@@ -1,6 +1,5 @@
 # src/pl/plpgsql/src/nls.mk
 CATALOG_NAME     = plpgsql
-AVAIL_LANGUAGES  = cs de el es fr it ja ko pl pt_BR ro ru sv tr uk vi zh_CN zh_TW
 GETTEXT_FILES    = pl_comp.c pl_exec.c pl_gram.c pl_funcs.c pl_handler.c pl_scanner.c
 GETTEXT_TRIGGERS = $(BACKEND_COMMON_GETTEXT_TRIGGERS) yyerror plpgsql_yyerror
 GETTEXT_FLAGS    = $(BACKEND_COMMON_GETTEXT_FLAGS)

src/pl/plpgsql/src/po/LINGUAS

@@ -0,0 +1 @@
+cs de el es fr it ja ko pl pt_BR ro ru sv tr uk vi zh_CN zh_TW

src/pl/plpython/nls.mk

@@ -1,6 +1,5 @@
 # src/pl/plpython/nls.mk
 CATALOG_NAME     = plpython
-AVAIL_LANGUAGES  = cs de el es fr it ja ko pl pt_BR ru sv tr uk vi zh_CN
 GETTEXT_FILES    = plpy_cursorobject.c plpy_elog.c plpy_exec.c plpy_main.c plpy_planobject.c plpy_plpymodule.c \
                    plpy_procedure.c plpy_resultobject.c plpy_spi.c plpy_subxactobject.c plpy_typeio.c plpy_util.c
 GETTEXT_TRIGGERS = $(BACKEND_COMMON_GETTEXT_TRIGGERS) PLy_elog:2 PLy_exception_set:2 PLy_exception_set_plural:2,3

src/pl/plpython/po/LINGUAS

@@ -0,0 +1 @@
+cs de el es fr it ja ko pl pt_BR ru sv tr uk vi zh_CN

src/pl/tcl/nls.mk

@@ -1,6 +1,5 @@
 # src/pl/tcl/nls.mk
 CATALOG_NAME     = pltcl
-AVAIL_LANGUAGES  = cs de el es fr it ja ko pl pt_BR ro ru sv tr uk vi zh_CN zh_TW
 GETTEXT_FILES    = pltcl.c
 GETTEXT_TRIGGERS = $(BACKEND_COMMON_GETTEXT_TRIGGERS)
 GETTEXT_FLAGS    = $(BACKEND_COMMON_GETTEXT_FLAGS)

src/pl/tcl/po/LINGUAS

@@ -0,0 +1 @@
+cs de el es fr it ja ko pl pt_BR ro ru sv tr uk vi zh_CN zh_TW