[gnote] Add utilities for reading text files

[Aurimas Černius <aurimasc src gnome org>]

commit 22c6e5e77eefd3c35e6a1244f460215584c6487e
Author: Aurimas Černius <aurisc4 gmail com>
Date:   Sun Feb 12 22:13:30 2017 +0200

    Add utilities for reading text files

 src/sharp/files.cpp           |   34 +++++++++++++++++++++++++++
 src/sharp/files.hpp           |    3 ++
 src/test/unit/filesutests.cpp |   51 +++++++++++++++++++++++++++++++++++++++++
 3 files changed, 88 insertions(+), 0 deletions(-)
---
diff --git a/src/sharp/files.cpp b/src/sharp/files.cpp
index 52fbb73..f15ab01 100644
--- a/src/sharp/files.cpp
+++ b/src/sharp/files.cpp
@@ -23,6 +23,8 @@
  * DEALINGS IN THE SOFTWARE.
  */
 
+#include <fstream>
+
 #include <glib/gstdio.h>
 #include <glibmm.h>
 #include <giomm/file.h>
@@ -74,5 +76,37 @@ namespace sharp {
   {
     g_rename(from.c_str(), to.c_str());
   }
+
+
+  std::vector<Glib::ustring> file_read_all_lines(const Glib::ustring & path)
+  {
+    std::vector<Glib::ustring> lines;
+    std::ifstream fin;
+    fin.open(path.c_str());
+    if(fin.is_open()) {
+      std::string line;
+      while(std::getline(fin, line)) {
+        lines.push_back(line);
+      }
+      fin.close();
+    }
+
+    return lines;
+  }
+
+  Glib::ustring file_read_all_text(const Glib::ustring & path)
+  {
+    auto lines = file_read_all_lines(path);
+    if(lines.size() == 0) {
+      return "";
+    }
+
+    Glib::ustring text = lines[0];
+    for(unsigned i = 1; i < lines.size(); ++i) {
+      text += "\n" + lines[i];
+    }
+
+    return text;
+  }
 }
 
diff --git a/src/sharp/files.hpp b/src/sharp/files.hpp
index cf330b9..0f20ffa 100644
--- a/src/sharp/files.hpp
+++ b/src/sharp/files.hpp
@@ -40,6 +40,9 @@ namespace sharp {
   /** return the filename from the file path */
   Glib::ustring file_filename(const Glib::ustring & p);
   void file_copy(const Glib::ustring & source, const Glib::ustring & dest);
+
+  std::vector<Glib::ustring> file_read_all_lines(const Glib::ustring & path);
+  Glib::ustring file_read_all_text(const Glib::ustring & path);
 }
 
 
diff --git a/src/test/unit/filesutests.cpp b/src/test/unit/filesutests.cpp
index e0a39ad..0403e6a 100644
--- a/src/test/unit/filesutests.cpp
+++ b/src/test/unit/filesutests.cpp
@@ -17,6 +17,10 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+#include <fstream>
+#include <stdlib.h>
+#include <unistd.h>
+
 #include <glibmm/miscutils.h>
 #include <UnitTest++/UnitTest++.h>
 
@@ -58,5 +62,52 @@ SUITE(files)
     CHECK(sharp::file_exists(__FILE__ __FILE__) == false);
     CHECK(sharp::file_exists(__FILE__) == true);
   }
+
+  TEST(read_all_lines)
+  {
+    std::vector<Glib::ustring> lines;
+    // very unlikely to exist
+    lines = sharp::file_read_all_lines(__FILE__ __FILE__);
+    CHECK_EQUAL(0, lines.size());
+
+    char temp_file_name[] = "/tmp/gnotetestXXXXXX";
+    int fd = mkstemp(temp_file_name);
+    close(fd);
+
+    lines = sharp::file_read_all_lines(temp_file_name);
+    CHECK_EQUAL(0, lines.size());
+
+    FILE *file = fopen(temp_file_name, "w");
+    fputs("line1\nline2\nline3", file);
+    fclose(file);
+
+    lines = sharp::file_read_all_lines(temp_file_name);
+    CHECK_EQUAL(3, lines.size());
+    CHECK_EQUAL("line1", lines[0]);
+    CHECK_EQUAL("line2", lines[1]);
+    CHECK_EQUAL("line3", lines[2]);
+  }
+
+  TEST(read_all_text)
+  {
+    Glib::ustring file_content;
+    // very unlikely to exist
+    file_content = sharp::file_read_all_text(__FILE__ __FILE__);
+    CHECK_EQUAL("", file_content);
+
+    char temp_file_name[] = "/tmp/gnotetestXXXXXX";
+    int fd = mkstemp(temp_file_name);
+    close(fd);
+
+    file_content = sharp::file_read_all_text(temp_file_name);
+    CHECK_EQUAL("", file_content);
+
+    FILE *file = fopen(temp_file_name, "w");
+    fputs("line1\nline2\nline3", file);
+    fclose(file);
+
+    file_content = sharp::file_read_all_text(temp_file_name);
+    CHECK_EQUAL("line1\nline2\nline3", file_content);
+  }
 }