Embed the translation files in the binary

If a translation file exists in a "translations" directory located in
the same directory as the binary, it is used in priority (this can be
useful when working on translations as you don't have to recompile the
whole program all the time), and if no such file is found the embedded
translation file is used (if it exists).

CMakeLists.txt

@@ -355,6 +355,10 @@ endif()
 
 add_definitions(-DAUTO_INITIALIZE_EASYLOGGINGPP)
 
+# Generate header for embedded translations
+add_subdirectory(translations)
+include_directories("${CMAKE_CURRENT_BINARY_DIR}/translations")
+
 add_subdirectory(external)
 
 # Final setup for miniupnpc

src/common/i18n.cpp

@@ -35,6 +35,7 @@
 #include "file_io_utils.h"
 #include "common/util.h"
 #include "common/i18n.h"
+#include "translation_files.h"
 
 #undef MONERO_DEFAULT_LOG_CATEGORY
 #define MONERO_DEFAULT_LOG_CATEGORY "i18n"
@@ -62,6 +63,7 @@ std::string i18n_get_language()
     e = "en";
 
   std::string language = e;
+  language = language.substr(0, language.find("."));
   std::transform(language.begin(), language.end(), language.begin(), tolower);
   return language;
 }
@@ -137,24 +139,39 @@ int i18n_set_language(const char *directory, const char *base, std::string langu
   i18n_log("Loading translations for language " << language);
 
   boost::system::error_code ignored_ec;
-  if (!boost::filesystem::exists(filename, ignored_ec)) {
+  if (boost::filesystem::exists(filename, ignored_ec)) {
+    if (!epee::file_io_utils::load_file_to_string(filename, contents)) {
+      i18n_log("Failed to load translations file: " << filename);
+      return -1;
+    }
+  } else {
     i18n_log("Translations file not found: " << filename);
+    filename = std::string(base) + "_" + language + ".qm";
+    if (!find_embedded_file(filename, contents)) {
+      i18n_log("Embedded translations file not found: " << filename);
       const char *underscore = strchr(language.c_str(), '_');
       if (underscore) {
         std::string fallback_language = std::string(language, 0, underscore - language.c_str());
         filename = std::string(directory) + "/" + base + "_" + fallback_language + ".qm";
-      i18n_log("Not found, loading translations for language " << fallback_language);
-      if (!boost::filesystem::exists(filename, ignored_ec)) {
-        i18n_log("Translations file not found: " << filename);
-        return -1;
-      }
-    }
-  }
-
+        i18n_log("Loading translations for language " << fallback_language);
+        if (boost::filesystem::exists(filename, ignored_ec)) {
           if (!epee::file_io_utils::load_file_to_string(filename, contents)) {
             i18n_log("Failed to load translations file: " << filename);
             return -1;
           }
+        } else {
+          i18n_log("Translations file not found: " << filename);
+          filename = std::string(base) + "_" + fallback_language + ".qm";
+          if (!find_embedded_file(filename, contents)) {
+            i18n_log("Embedded translations file not found: " << filename);
+            return -1;
+          }
+        }
+      } else {
+        return -1;
+      }
+    }
+  }
 
   data = (const unsigned char*)contents.c_str();
   datalen = contents.size();

translations/CMakeLists.txt

@@ -0,0 +1,54 @@
+# Copyright (c) 2017, The Monero Project
+#
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without modification, are
+# permitted provided that the following conditions are met:
+#
+# 1. Redistributions of source code must retain the above copyright notice, this list of
+#    conditions and the following disclaimer.
+#
+# 2. Redistributions in binary form must reproduce the above copyright notice, this list
+#    of conditions and the following disclaimer in the documentation and/or other
+#    materials provided with the distribution.
+#
+# 3. Neither the name of the copyright holder nor the names of its contributors may be
+#    used to endorse or promote products derived from this software without specific
+#    prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
+# EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+# MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
+# THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+# PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+# STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
+# THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+cmake_minimum_required(VERSION 2.8.7)
+
+add_executable(generate_translations_header generate_translations_header.c)
+
+find_program(LRELEASE lrelease)
+if(LRELEASE STREQUAL "LRELEASE-NOTFOUND")
+  set(ts_files "")
+  message(WARNING "lrelease program not found, translation files not built")
+else()
+  file(GLOB ts_files RELATIVE "${CMAKE_CURRENT_SOURCE_DIR}" *.ts)
+  foreach(ts_file ${ts_files})
+    string(REPLACE ".ts" ".qm" qm_file "${ts_file}")
+    add_custom_command(TARGET generate_translations_header
+      PRE_BUILD
+      COMMAND ${LRELEASE} "${CMAKE_CURRENT_SOURCE_DIR}/${ts_file}" -qm "${qm_file}"
+      WORKING_DIRECTORY "${CMAKE_CURRENT_BIN_DIR}")
+  endforeach()
+endif()
+
+string(REPLACE ".ts" ".qm" qm_files "${ts_files}")
+
+add_custom_command(TARGET generate_translations_header
+  POST_BUILD
+  COMMAND generate_translations_header ${qm_files}
+  WORKING_DIRECTORY "${CMAKE_CURRENT_BIN_DIR}"
+  COMMENT "Generating embedded translations header")

translations/generate_translations_header.c

@@ -0,0 +1,86 @@
+// Copyright (c) 2013, Sergey Lyubka
+// Copyright (c) 2017, The Monero Project
+// All rights reserved.
+// Released under the MIT license.
+
+// This program takes a list of files as an input, and produces C++ code that
+// contains the contents of all these files as a collection of strings.
+//
+// Usage:
+//   1. Compile this file:
+//      cc -o generate-translations-header generate-translations-header.c
+//
+//   2. Convert list of files into single header:
+//      ./generate-translations-header monero_fr.qm monero_it.qm > translations_files.h
+//
+//   3. In your application code, include translations_files.h, then you can
+//      access the files using this function:
+//      static bool find_embedded_file(const std::string &file_name, std::string &data);
+//      std::string data;
+//      find_embedded_file("monero_fr.qm", data);
+
+#include <stdio.h>
+#include <stdlib.h>
+
+static const char *code =
+  "static bool find_embedded_file(const std::string &name, std::string &data) {\n"
+  "  const struct embedded_file *p;\n"
+  "  for (p = embedded_files; p->name != NULL; p++) {\n"
+  "    if (*p->name == name) {\n"
+  "      data = *p->data;\n"
+  "      return true;\n"
+  "    }\n"
+  "  }\n"
+  "  return false;\n"
+  "}\n";
+
+int main(int argc, char *argv[]) {
+  FILE *fp, *foutput;
+  int i, j, ch;
+
+  if((foutput = fopen("translation_files.h", "w")) == NULL) {
+    exit(EXIT_FAILURE);
+  }
+
+  fprintf(foutput, "#ifndef TRANSLATION_FILES_H\n");
+  fprintf(foutput, "#define TRANSLATION_FILES_H\n\n");
+  fprintf(foutput, "#include <string>\n\n");
+
+  for (i = 1; i < argc; i++) {
+    if ((fp = fopen(argv[i], "rb")) == NULL) {
+      exit(EXIT_FAILURE);
+    } else {
+      fprintf(foutput, "static const std::string translation_file_name_%d = \"%s\";\n", i, argv[i]);
+      fprintf(foutput, "static const std::string translation_file_data_%d = std::string(", i);
+      for (j = 0; (ch = fgetc(fp)) != EOF; j++) {
+        if ((j % 16) == 0) {
+          if (j > 0) {
+            fprintf(foutput, "%s", "\"");
+          }
+          fprintf(foutput, "%s", "\n  \"");
+        }
+        fprintf(foutput, "\\x%02x", ch);
+      }
+      fprintf(foutput, "\",\n  %d);\n\n", j);
+      fclose(fp);
+    }
+  }
+
+  fprintf(foutput, "%s", "static const struct embedded_file {\n");
+  fprintf(foutput, "%s", "  const std::string *name;\n");
+  fprintf(foutput, "%s", "  const std::string *data;\n");
+  fprintf(foutput, "%s", "} embedded_files[] = {\n");
+
+  for (i = 1; i < argc; i++) {
+    fprintf(foutput, "  {&translation_file_name_%d, &translation_file_data_%d},\n", i, i);
+  }
+  fprintf(foutput, "%s", "  {NULL, NULL}\n");
+  fprintf(foutput, "%s", "};\n\n");
+  fprintf(foutput, "%s\n", code);
+
+  fprintf(foutput, "#endif /* TRANSLATION_FILES_H */\n");
+
+  fclose(foutput);
+
+  return EXIT_SUCCESS;
+}