[gnote] Add read_all_text for Gio::File

[Aurimas Černius <aurimasc src gnome org>]

commit 9b167a2bea60604303982fa6249591faec3d6d3e
Author: Aurimas Černius <aurisc4 gmail com>
Date:   Sat Apr 13 14:39:12 2019 +0300

    Add read_all_text for Gio::File

 src/sharp/files.cpp           | 18 +++++++++++++++++-
 src/sharp/files.hpp           |  3 ++-
 src/test/unit/filesutests.cpp | 22 +++++++++++++++++++++-
 3 files changed, 40 insertions(+), 3 deletions(-)
---
diff --git a/src/sharp/files.cpp b/src/sharp/files.cpp
index 1e40fdcf..3d9a4cba 100644
--- a/src/sharp/files.cpp
+++ b/src/sharp/files.cpp
@@ -1,7 +1,7 @@
 /*
  * gnote
  *
- * Copyright (C) 2011,2017-2018 Aurimas Cernius
+ * Copyright (C) 2011,2017-2019 Aurimas Cernius
  * Copyright (C) 2009 Hubert Figuiere
  * 
  * Permission is hereby granted, free of charge, to any person obtaining a
@@ -124,6 +124,22 @@ namespace sharp {
     return text;
   }
 
+  Glib::ustring file_read_all_text(const Glib::RefPtr<Gio::File> & path)
+  {
+    auto stream = path->read();
+    std::ostringstream os;
+    int buf_size = 4 * 1024;
+    char buffer[buf_size];
+    gssize read = 0;
+    do {
+      read = stream->read(buffer, buf_size);
+      os.write(buffer, read);
+    }
+    while(read == buf_size);
+    stream->close();
+    return os.str();
+  }
+
   void file_write_all_text(const Glib::ustring & path, const Glib::ustring & content)
   {
     std::ofstream fout(path);
diff --git a/src/sharp/files.hpp b/src/sharp/files.hpp
index 85fc0fa3..41ffa2df 100644
--- a/src/sharp/files.hpp
+++ b/src/sharp/files.hpp
@@ -1,7 +1,7 @@
 /*
  * gnote
  *
- * Copyright (C) 2017-2018 Aurimas Cernius
+ * Copyright (C) 2017-2019 Aurimas Cernius
  * Copyright (C) 2009 Hubert Figuiere
  * 
  * Permission is hereby granted, free of charge, to any person obtaining a
@@ -47,6 +47,7 @@ namespace sharp {
 
   std::vector<Glib::ustring> file_read_all_lines(const Glib::ustring & path);
   Glib::ustring file_read_all_text(const Glib::ustring & path);
+  Glib::ustring file_read_all_text(const Glib::RefPtr<Gio::File> & path);
   void file_write_all_text(const Glib::ustring & path, const Glib::ustring & content);
 }
 
diff --git a/src/test/unit/filesutests.cpp b/src/test/unit/filesutests.cpp
index e5a59ec5..fe76c6d1 100644
--- a/src/test/unit/filesutests.cpp
+++ b/src/test/unit/filesutests.cpp
@@ -1,7 +1,7 @@
 /*
  * gnote
  *
- * Copyright (C) 2017-2018 Aurimas Cernius
+ * Copyright (C) 2017-2019 Aurimas Cernius
  *
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -117,6 +117,26 @@ SUITE(files)
     CHECK_EQUAL("line1\nline2\nline3", file_content);
   }
 
+  TEST(read_all_text_gio)
+  {
+    Glib::ustring file_content;
+
+    char temp_file_name[] = "/tmp/gnotetestXXXXXX";
+    int fd = mkstemp(temp_file_name);
+    close(fd);
+
+    auto file = Gio::File::create_for_path(temp_file_name);
+    file_content = sharp::file_read_all_text(file);
+    CHECK_EQUAL("", file_content);
+
+    FILE *f = fopen(temp_file_name, "w");
+    fputs("line1\nline2\nline3", f);
+    fclose(f);
+
+    file_content = sharp::file_read_all_text(file);
+    CHECK_EQUAL("line1\nline2\nline3", file_content);
+  }
+
   TEST(write_all_text)
   {
     Glib::ustring file_content = "line1\nline2\nline3";