Optimize creation of localized default templates

- extract localized strings directly from .po/.mo files instead of
  having them in a separate file
- drop dependency on perl
- avoid re-creating the templates on each build

3 files changed, 91 insertions, 74 deletions

diff --git a/share/templates/CMakeLists.txt b/share/templates/CMakeLists.txt
index aecdca6bb..563c55837 100644
--- a/share/templates/CMakeLists.txt
+++ b/share/templates/CMakeLists.txt
@@ -12,13 +12,23 @@ add_custom_target(templates_h ALL DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/templates.
 
 install(FILES ${_FILES} "README" DESTINATION ${INKSCAPE_SHARE_INSTALL}/templates)
 
-install(DIRECTORY ${CMAKE_CURRENT_BINARY_DIR} DESTINATION ${INKSCAPE_SHARE_INSTALL} 
-  FILES_MATCHING PATTERN "*.svg" PATTERN "CMakeFiles" EXCLUDE )
 
-add_custom_target(inkscape_default_svg ALL 
-  DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/create_defaults.pl ${CMAKE_CURRENT_SOURCE_DIR}/default.svg 
-  #BYPRODUCTS ${CMAKE_CURRENT_BINARY_DIR}/default-*
-  COMMAND sh -c "${CMAKE_CURRENT_SOURCE_DIR}/create_defaults.pl"
-  COMMAND sh -c "mv default-* ${CMAKE_CURRENT_BINARY_DIR}"
-  WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR})
+# create localized versions of default.svg
+file(GLOB POFILES ${CMAKE_SOURCE_DIR}/po/*.po)
+  foreach(pofile ${POFILES})
+  string(REGEX REPLACE "(.+(\\\\|/))+" "${CMAKE_BINARY_DIR}/po/" pofile ${pofile})
+  string(REGEX REPLACE "\\.po$" ".gmo" pofile ${pofile})
+  list(APPEND GMOFILES "${pofile}")
+endforeach(pofile)
+
+add_custom_command(
+  OUTPUT default_templates.timestamp
+  COMMAND ./create_default_templates.py ${CMAKE_SOURCE_DIR} ${CMAKE_BINARY_DIR}
+  DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/default.svg ${CMAKE_CURRENT_SOURCE_DIR}/create_default_templates.py ${GMOFILES}
+  WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
+  COMMENT "Generating localized default templates"
+)
+add_custom_target(default_templates ALL DEPENDS default_templates.timestamp)
 
+install(DIRECTORY ${CMAKE_CURRENT_BINARY_DIR} DESTINATION ${INKSCAPE_SHARE_INSTALL} 
+  FILES_MATCHING PATTERN "*.svg" PATTERN "CMakeFiles" EXCLUDE )
diff --git a/share/templates/create_default_templates.py b/share/templates/create_default_templates.py
new file mode 100755
index 000000000..eb8de35ed
--- /dev/null
+++ b/share/templates/create_default_templates.py
@@ -0,0 +1,73 @@
+#!/usr/bin/env python
+#
+# Creates localized default templates
+# (uses default.svg as base and reads localized strings directly from .po/.gmo files)
+#
+
+from __future__ import print_function
+from __future__ import unicode_literals  # make all literals unicode strings by default (even in Python 2)
+
+import gettext
+import glob
+import os
+import shutil
+import sys
+from io import open  # needed for support of encoding parameter in Python 2
+
+
+LAYER_STRING = 'Layer'
+
+
+if len(sys.argv) != 3:
+    sys.exit("Usage:\n  %s ${CMAKE_SOURCE_DIR} ${CMAKE_BINARY_DIR}" % sys.argv[0])
+
+source_dir = sys.argv[1]
+binary_dir = sys.argv[2]
+
+
+# get available languages (should match the already created .gmo files)
+gmofiles = glob.glob(binary_dir + '/po/*.gmo')
+
+languages = gmofiles
+languages = [language.split('/')[-1] for language in languages]  # split filename from path
+languages = [language.split('.')[-2] for language in languages]  # split extension
+
+
+# process each language sequentially
+for language in languages:
+    # copy .gmo file into a location where gettext can find and use it
+    source = binary_dir + '/po/' + language + '.gmo'
+    destination_dir = binary_dir + '/po/locale/' + language + '/LC_MESSAGES/'
+    destination = destination_dir + 'inkscape.mo'
+
+    if not os.path.isdir(destination_dir):
+        os.makedirs(destination_dir)
+    shutil.copy(source, destination)
+
+    # get translation with help of gettext
+    translation = gettext.translation('inkscape', localedir=binary_dir + '/po/locale', languages=[language])
+    translated_string = translation.gettext(LAYER_STRING)
+
+    if type(translated_string) != type(LAYER_STRING):  # python2 compat (make sure translation is a Unicode string)
+        translated_string = translated_string.decode('utf-8')
+
+    # now create localized version of English template file (if we have a translation)
+    template_file = source_dir + '/share/templates/default.svg'
+    output_file = binary_dir + '/share/templates/default-' + language + '.svg'
+
+    if os.path.isfile(output_file):
+        os.remove(output_file)
+    if translated_string != LAYER_STRING:
+        with open(template_file, 'r', encoding='utf-8', newline='\n') as file:
+            filedata = file.read()
+        filedata = filedata.replace('Layer', translated_string)
+        with open(output_file, 'w', encoding='utf-8', newline='\n') as file:
+            file.write(filedata)
+
+
+# create timestamp file (indicates last sucessful creation for build system)
+timestamp_file = binary_dir + '/share/templates/default_templates.timestamp'
+if os.path.exists(timestamp_file):
+    os.utime(timestamp_file, None)
+else:
+    open(timestamp_file, 'a').close()
diff --git a/share/templates/create_defaults.pl b/share/templates/create_defaults.pl
deleted file mode 100755
index 173be02f8..000000000
--- a/share/templates/create_defaults.pl
+++ /dev/null
@@ -1,66 +0,0 @@
-#!/usr/bin/perl
-
-# Purpose: To create internationalized versions of default.svg.
-
-# Usage:  create_defaults.pl
-
-use strict;
-use warnings;
-use utf8;
-
-my $count = 0;
-
-# Data base
-
-my @data = (
-	["be",	"Пласт 1",	"layer1"],
-	["ca",	"Capa 1",	"capa1"],
-	["cs",	"Vrstva 1",	"layer1"],
-	["de",	"Ebene 1",	"layer1"],
-	["eo",	"Tavolo 1",	"layer1"],
-	["es",	"Capa 1",	"layer1"],
-	["eu",	"Capa 1",	"layer1"],
-	["fi",	"Taso 1",	"layer1"],
-	["fr",	"Calque 1",	"layer1"],
-	["hr",	"Sloj 1",	"layer1"],
-	["hu",	"1. réteg",	"layer1"],
-	["it",	"Livello 1",	"layer1"],
-	["ja",	"レイヤー 1",	"layer1"],
-	["lt",	"Sluoksnis 1",	"layer1"],
-	["nl",	"Laag 1",	"layer1"],
-	["pl",	"Warstwa 1",	"layer1"],
-	["pt_BR",	"Camada 1",	"layer1"],
-	["pt",	"Camada 1",	"layer1"],
-	["ro",	"Strat 1",	"layer1"],
-	["sk",	"Vrstva 1",	"layer1"],
-	["zh_TW",	"圖層 1",	"layer1"]
-    );
-
-foreach my $lang (@data ) {
-
-    ++$count;
-
-    my @values = @{$lang};
-    print "$values[0]\n";
-
-    my $filename = "default-" . $values[0] . ".svg";
-    open( OUTPUT, '>:encoding(UTF-8)', $filename ) or die "Cannot open $filename.\n";
-
-    # Open input again to return to top...
-    open (INPUT, '<:encoding(UTF-8)', "default.svg") or die 'Cannot open input\n';
-
-    while( my $line = <INPUT> ) {
-
-	if( $line =~ /inkscape:label=/ ) {
-	    $line =~ s/Layer 1/$values[1]/;
-	}
-	print OUTPUT $line;
-
-    }
-
-    close( INPUT );
-    close( OUTPUT );
-}
-
-
-print "Created $count files.\n";