WIP: Moved sources int src/, separated most of the source code from Perl.

The XS was left only for the unit / integration tests, and it links
libslic3r only. No wxWidgets are allowed to be used from Perl starting
from now.

src/slic3r/Config/Snapshot.hpp

@@ -0,0 +1,129 @@
+#ifndef slic3r_GUI_Snapshot_
+#define slic3r_GUI_Snapshot_
+
+#include <map>
+#include <set>
+#include <string>
+#include <vector>
+
+#include <boost/filesystem.hpp>
+
+#include "Version.hpp"
+#include "../Utils/Semver.hpp"
+
+namespace Slic3r { 
+
+class AppConfig;
+
+namespace GUI {
+namespace Config {
+
+class Index;
+
+// A snapshot contains:
+// 		Slic3r.ini
+// 		vendor/
+// 		print/
+// 		filament/
+//		printer/
+class Snapshot
+{
+public:
+	enum Reason {
+		SNAPSHOT_UNKNOWN,
+		SNAPSHOT_UPGRADE,
+		SNAPSHOT_DOWNGRADE,
+		SNAPSHOT_BEFORE_ROLLBACK,
+		SNAPSHOT_USER,
+	};
+
+	Snapshot() { clear(); }
+
+	void 		clear();
+	void 		load_ini(const std::string &path);
+	void 		save_ini(const std::string &path);
+
+	// Export the print / filament / printer selections to be activated into the AppConfig.
+	void 		export_selections(AppConfig &config) const;
+	void 		export_vendor_configs(AppConfig &config) const;
+
+	// Perform a deep compare of the active print / filament / printer / vendor directories.
+	// Return true if the content of the current print / filament / printer / vendor directories
+	// matches the state stored in this snapshot.
+	bool 		equal_to_active(const AppConfig &app_config) const;
+
+	// ID of a snapshot should equal to the name of the snapshot directory.
+	// The ID contains the date/time, reason and comment to be human readable.
+	std::string					id;
+	std::time_t					time_captured;
+	// Which Slic3r version captured this snapshot?
+	Semver		 				slic3r_version_captured = Semver::invalid();
+	// Comment entered by the user at the start of the snapshot capture.
+	std::string 				comment;
+	Reason						reason;
+
+	std::string 				format_reason() const;
+
+	// Active presets at the time of the snapshot.
+	std::string 				print;
+	std::vector<std::string>	filaments;
+	std::string					printer;
+
+	// Annotation of the vendor configuration stored in the snapshot.
+	// This information is displayed to the user and used to decide compatibility
+	// of the configuration stored in the snapshot with the running Slic3r version.
+	struct VendorConfig {
+		// Name of the vendor contained in this snapshot.
+		std::string name;
+		// Version of the vendor config contained in this snapshot, along with compatibility data.
+		Version version;
+		// Which printer models of this vendor were installed, and which variants of the models?
+		std::map<std::string, std::set<std::string>> models_variants_installed;
+	};
+	// List of vendor configs contained in this snapshot, sorted lexicographically.
+	std::vector<VendorConfig> 	vendor_configs;
+};
+
+class SnapshotDB
+{
+public:
+	// Initialize the SnapshotDB singleton instance. Load the database if it has not been loaded yet.
+	static SnapshotDB&				singleton();
+
+	typedef std::vector<Snapshot>::const_iterator const_iterator;
+
+	// Load the snapshot database from the snapshots directory.
+	// If the snapshot directory or its parent does not exist yet, it will be created.
+	// Returns a number of snapshots loaded.
+	size_t 							load_db();
+	void 							update_slic3r_versions(std::vector<Index> &index_db);
+
+	// Create a snapshot directory, copy the vendor config bundles, user print/filament/printer profiles,
+	// create an index.
+	const Snapshot&					take_snapshot(const AppConfig &app_config, Snapshot::Reason reason, const std::string &comment = "");
+	const Snapshot&					restore_snapshot(const std::string &id, AppConfig &app_config);
+	void 							restore_snapshot(const Snapshot &snapshot, AppConfig &app_config);
+	// Test whether the AppConfig's on_snapshot variable points to an existing snapshot, and the existing snapshot
+	// matches the current state. If it does not match the current state, the AppConfig's "on_snapshot" ID is reset.
+	bool 							is_on_snapshot(AppConfig &app_config) const;
+	// Finds the newest snapshot, which contains a config bundle for vendor_name with config_version.
+	const_iterator					snapshot_with_vendor_preset(const std::string &vendor_name, const Semver &config_version);
+
+	const_iterator					begin()     const { return m_snapshots.begin(); }
+	const_iterator					end()       const { return m_snapshots.end(); }
+	const_iterator 					snapshot(const std::string &id) const;
+	const std::vector<Snapshot>& 	snapshots() const { return m_snapshots; }
+
+private:
+	// Create the snapshots directory if it does not exist yet.
+	static boost::filesystem::path	create_db_dir();
+
+	// Snapshots are sorted by their date/time, oldest first.
+	std::vector<Snapshot>			m_snapshots;
+};
+
+} // namespace Config
+} // namespace GUI
+} // namespace Slic3r
+
+#endif /* slic3r_GUI_Snapshot_ */