Implement subscript operator returning sections

src/core/desktopfilereader.cpp

@@ -148,3 +148,14 @@ bool DesktopFileReader::operator!=(const DesktopFileReader& other) const {
 boost::filesystem::path DesktopFileReader::path() const {
     return d->path;
 }
+
+section_t DesktopFileReader::operator[](const std::string& name) {
+    auto it = d->sections.find(name);
+
+    // the map would lazy-initialize a new entry in case the section doesn't exist
+    // therefore explicitly checking whether the section exists, throwing an exception in case it does not
+    if (it == d->sections.end())
+        throw std::range_error("could not find section " + name);
+
+    return it->second;
+}

src/core/desktopfilereader.h

@@ -1,12 +1,16 @@
 #pragma once
 
 // system includes
-#include <memory>
 #include <istream>
+#include <memory>
+#include <unordered_map>
 
 // library includes
 #include <boost/filesystem.hpp>
 
+// local includes
+#include "desktopfileentry.h"
+
 class DesktopFileReader {
 private:
     // opaque data class pattern
@@ -44,4 +48,8 @@ public:
 
     // returns desktop file path
     boost::filesystem::path path() const;
+
+    // get a specific section from the parsed data
+    // throws std::range_error if section does not exist
+    std::unordered_map<std::string, DesktopFileEntry> operator[](const std::string& name);
 };

tests/core/test_desktopfilereader.cpp

@@ -104,6 +104,16 @@ TEST_F(DesktopFileReaderFixture, testParseSimpleDesktopFile) {
     reader = DesktopFileReader(ss);
 }
 
+TEST_F(DesktopFileReaderFixture, testParseFileGetNonExistingSection) {
+    std::stringstream ss;
+    ss << "[Desktop File]" << std::endl;
+
+    DesktopFileReader reader;
+    reader = DesktopFileReader(ss);
+
+    ASSERT_THROW(reader["Non-existing Section"], std::range_error);
+}
+
 TEST_F(DesktopFileReaderFixture, testParseFileMissingSectionHeader) {
     std::stringstream ss;
     ss << "Name=name" << std::endl