utils: Add a trim helper function

Makefile.am

@@ -102,6 +102,7 @@ libmedialibrary_la_SOURCES = \
 	src/utils/Directory.cpp \
 	src/utils/Filename.cpp \
 	src/utils/ModificationsNotifier.cpp \
+	src/utils/Strings.cpp \
 	src/utils/Url.cpp \
 	$(NULL)
 
@@ -161,6 +162,7 @@ noinst_HEADERS = \
 	src/utils/Directory.h \
 	src/utils/Filename.h \
 	src/utils/ModificationsNotifier.h \
+	src/utils/Strings.h \
 	src/utils/SWMRLock.h \
 	src/utils/Url.h \
 	src/VideoTrack.h \

src/utils/Strings.cpp

+/*****************************************************************************
+ * Media Library
+ *****************************************************************************
+ * Copyright (C) 2018 Hugo Beauzée-Luyssen, Videolabs
+ *
+ * Authors: Hugo Beauzée-Luyssen<hugo@beauzee.fr>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation; either version 2.1 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
+ *****************************************************************************/
+
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+
+#include "Strings.h"
+
+#include <algorithm>
+#include <cctype>
+
+namespace medialibrary
+{
+namespace utils
+{
+namespace str
+{
+
+std::string& trim( std::string& value )
+{
+    value.erase( begin( value ), std::find_if( begin( value ), end( value ), []( char c ) {
+            return isspace( c ) == false;
+        }));
+    value.erase( std::find_if( value.rbegin(), value.rend(), []( char c ) {
+            return isspace( c ) == false;
+        }).base(), value.end() );
+    return value;
+}
+
+std::string trim( const std::string& value )
+{
+    std::string v = value;
+    trim( v );
+    return v;
+}
+
+}
+}
+}

src/utils/Strings.h

+/*****************************************************************************
+ * Media Library
+ *****************************************************************************
+ * Copyright (C) 2018 Hugo Beauzée-Luyssen, Videolabs
+ *
+ * Authors: Hugo Beauzée-Luyssen<hugo@beauzee.fr>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation; either version 2.1 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
+ *****************************************************************************/
+
+#pragma once
+
+#include <string>
+
+namespace medialibrary
+{
+namespace utils
+{
+namespace str
+{
+
+/**
+ * @brief trim Trim the provided string in place
+ */
+std::string& trim(std::string& value );
+
+/**
+ * @brief trim Returns a copy of the trimmed provided string
+ */
+std::string trim( const std::string& value );
+
+}
+}
+}

test/unittest/MiscTests.cpp

@@ -29,6 +29,7 @@
 #include "Tests.h"
 #include "database/SqliteTools.h"
 #include "database/SqliteConnection.h"
+#include "utils/Strings.h"
 
 #include "Artist.h"
 #include "Media.h"
@@ -48,6 +49,15 @@ TEST_F( Misc, FileExtensions )
     }
 }
 
+TEST_F( Misc, TrimString )
+{
+    ASSERT_EQ( utils::str::trim( "hello world" ), "hello world" );
+    ASSERT_EQ( utils::str::trim( "  spaaaaaace   " ), "spaaaaaace" );
+    ASSERT_EQ( utils::str::trim( "\tfluffy\notters  \t\n" ), "fluffy\notters" );
+    ASSERT_EQ( utils::str::trim( "    " ), "" );
+    ASSERT_EQ( utils::str::trim( "" ), "" );
+}
+
 class DbModel : public testing::Test
 {
 protected: