Library: Update documentation for the Library tag

I also take the chance to remove the corresponding section of the DESIGN
file.

Signed-off-by: Anna Schumaker <Anna@OcarinaProject.net>

DESIGN

@@ -120,51 +120,6 @@ Tag Database:
 
 
 
-Library Tag:
-	The library tag is used to store a single directory added to Ocarina
-	by the user.  It is not an ID3 tag, and is instead something I use
-	internally to keep track of paths added by the user.  The count field
-	will be managed by the Track tag class.
-
-- Library:
-	class Library : public DatabaseEntry {
-	public:
-		std::string  root_path;
-		unsigned int count;
-		bool enabled;
-
-		Library();
-		Library(const std::string &);
-		const std::string primary_key() const;
-		void read(File &);
-		void write(File &);
-	};
-
-- File Format:
-	File << enabled << root_path
-
-- API:
-	Library();
-		Initialize an invalid Library instance.
-		Set count = 0.
-		Set enabled = false.
-
-	Library(const std::string &path);
-		Set root_path from the provided path.
-		Set count = 0.
-		Set enabled = true.
-
-	const std::string Library :: primary_key() const;
-		Use root_path as the primary key,
-
-	void read(File &f);
-		Read a library path from file.
-
-	void write(File &f);
-		Write a library path to file.
-
-
-
 Track Tag:
 	The track tag is used to store information about a single track in the
 	user's music collection.

core/tags/library.cpp

@@ -9,8 +9,8 @@ Library :: Library()
 {
 }
 
-Library :: Library(const std::string &s)
-	 : _size(0), _path(s), _enabled(true)
+Library :: Library(const std::string &path)
+	 : _size(0), _path(path), _enabled(true)
 {
 }
 
@@ -19,15 +19,15 @@ const std::string Library :: primary_key() const
 	return _path;
 }
 
-void Library :: read(File &f)
+void Library :: read(File &file)
 {
-	f >> _enabled;
-	_path = f.getline();
+	file >> _enabled;
+	_path = file.getline();
 }
 
-void Library :: write(File &f)
+void Library :: write(File &file)
 {
-	f << _enabled << " " << _path;
+	file << _enabled << " " << _path;
 }
 
 const bool Library :: enabled()

include/core/tags/library.h

@@ -8,7 +8,15 @@
 #include <core/database.h>
 
 /**
- * Library tag
+ * The Library tag is used to store a single directory added
+ * to Ocarina by the user.
+ *
+ * When writing a Library tag to disk, write out the _enabled
+ * and _path fields for each tag.
+ *
+ * 	... << enabled1 << path1
+ * 	... << enabled2 << path2
+ * 	... << enabled3 << path3
  */
 class Library : public DatabaseEntry {
 private:
@@ -17,29 +25,32 @@ private:
 	bool _enabled;		/**< Is this library path enabled? */
 
 public:
-	/** Library constructor */
-	Library();
+	Library(); /**< Library tag constructor. */
 
 	/**
-	 * Library constructor
-	 * @param  path  Path to the library on disk.
+	 * Library tag constructor.
+	 *
+	 * @param  path  Path to the library directory on disk.
 	 */
 	Library(const std::string &);
 
 	/**
 	 * Called to access the library tag's primary key.
-	 * @return Library::root_path
+	 *
+	 * @return Library::_path.
 	 */
 	const std::string primary_key() const;
 
 	/**
 	 * Read library information from file.
+	 *
 	 * @param  file  The file to read from.
 	 */
 	void read(File &);
 
 	/**
 	 * Write library information to file.
+	 *
 	 * @param  file  The file to write to.
 	 */
 	void write(File &);
@@ -59,7 +70,6 @@ public:
 	 */
 	void set_enabled(bool);
 
-
 	/**
 	 * Called to access the number of tracks in this library.
 	 *
@@ -68,12 +78,12 @@ public:
 	const unsigned int size();
 
 	/**
-	 * Used to increase _size by 1.
+	 * Used to increase Library::_size by 1.
 	 */
 	void inc_size();
 
 	/**
-	 * Used to decrease _size by 1.
+	 * Used to decrease Library::_size by 1.
 	 */
 	void dec_size();
 };