pidgin/pidgin

GSoC History API including sqlite history adapter

2021-10-12, James Culver
741992355ead
GSoC History API including sqlite history adapter

The History API has been created to drive all message handling in purple3. It will be used to update existing messages for edits, reactions, pinning, read/deliver receipts, etc. The API uses an adapter pattern, to abstract out backends, but provides a SQLite3 backend by default.

It also provides search capabilities using a custom query language that can easily be expanded over time. It will be use by both the end user to search messages and the frontends to implement features like a pinned messages button. A command line utility is also provided for searching outside of the program itself.

## Remaining Items

**These all will most likely be done by the Pidgin core team after GSoC when we figure out exactly how to solve them.**

Need to store database in purple config directory
* Gary has spent some time looking at this and it looks like the purple-history cli will need to become a purple-ui to make this work write as in the future other adapters will be plugins.

Other things to consider:
- For simplicity, the SqliteHistoryAdapter is parsing the query itself, but for consistency having `PurpleHistoryAdapter` parse the query and pass tokens to the subclass might be something we want to do.

Testing Done:
## Unit Tests
History Manager
History Adapter

## Integration Tests
purplehistorycore created for integration tests.
PurpleSqliteHistoryAdapter functionality tested:
- Creates proper db schema
- Writes logs
- Reads logs
- Queries using query language
- Deletes using query language

Bugs closed: PIDGIN-17526, PIDGIN-17532, PIDGIN-17533, PIDGIN-17534

Reviewed at https://reviews.imfreedom.org/r/877/
/*
* Purple - Internet Messaging Library
* Copyright (C) Pidgin Developers <devel@pidgin.im>
*
* Purple is the legal property of its developers, whose names are too numerous
* to list here. Please refer to the COPYRIGHT file distributed with this
* source distribution.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <https://www.gnu.org/licenses/>.
*/
#if !defined(PURPLE_GLOBAL_HEADER_INSIDE) && !defined(PURPLE_COMPILATION)
# error "only <purple.h> may be included directly"
#endif
#ifndef PURPLE_THEME_MANAGER_H
#define PURPLE_THEME_MANAGER_H
/**
* SECTION:theme-manager
* @section_id: libpurple-theme-manager
* @short_description: <filename>theme-manager.h</filename>
* @title: Theme Manager API
*
* The theme manager manages of all the available themes and allows you to load
* them.
*/
#include <glib-object.h>
#include <glib.h>
#include "theme.h"
#include "theme-loader.h"
typedef void (*PurpleThemeFunc) (PurpleTheme *theme);
/**
* PURPLE_TYPE_THEME_MANAGER:
*
* The standard _get_type macro for #PurpleThemeManager.
*/
#define PURPLE_TYPE_THEME_MANAGER purple_theme_manager_get_type()
/**************************************************************************/
/* Purple Theme Manager API */
/**************************************************************************/
G_BEGIN_DECLS
/**
* purple_theme_manager_get_type:
*
* The standard _get_type function for #GType's.
*
* Returns: The #GType for theme manager.
*/
G_DECLARE_FINAL_TYPE(PurpleThemeManager, purple_theme_manager, PURPLE,
THEME_MANAGER, GObject)
/**
* purple_theme_manager_init:
*
* Initializes the theme manager.
*/
void purple_theme_manager_init(void);
/**
* purple_theme_manager_uninit:
*
* Uninitializes the manager then frees all the themes and loaders it is
* responsible for.
*/
void purple_theme_manager_uninit(void);
/**
* purple_theme_manager_refresh:
*
* Rebuilds all the themes in the theme manager.
* (Removes all current themes but keeps the added loaders.)
*/
void purple_theme_manager_refresh(void);
/**
* purple_theme_manager_find_theme:
* @name: The name of the PurpleTheme.
* @type: The type of the PurpleTheme.
*
* Finds the PurpleTheme object stored by the theme manager.
*
* Returns: (transfer none): The PurpleTheme, or NULL if it wasn't found.
*/
PurpleTheme *purple_theme_manager_find_theme(const gchar *name, const gchar *type);
/**
* purple_theme_manager_add_theme:
* @theme: The PurpleTheme to add to the manager.
*
* Adds a PurpleTheme to the theme manager. If the theme already exists
* then this function does nothing.
*/
void purple_theme_manager_add_theme(PurpleTheme *theme);
/**
* purple_theme_manager_remove_theme:
* @theme: The PurpleTheme to remove from the manager.
*
* Removes a PurpleTheme from the theme manager and frees the theme.
*/
void purple_theme_manager_remove_theme(PurpleTheme *theme);
/**
* purple_theme_manager_register_type:
* @loader: The PurpleThemeLoader to add.
*
* Adds a loader to the theme manager so it knows how to build themes.
*/
void purple_theme_manager_register_type(PurpleThemeLoader *loader);
/**
* purple_theme_manager_unregister_type:
* @loader: The PurpleThemeLoader to be removed.
*
* Removes the loader and all themes of the same type from the loader.
*/
void purple_theme_manager_unregister_type(PurpleThemeLoader *loader);
/**
* purple_theme_manager_for_each_theme:
* @func: (scope call): The PurpleThemeFunc to be applied to each theme.
*
* Calls the given function on each purple theme.
*/
void purple_theme_manager_for_each_theme(PurpleThemeFunc func);
/**
* purple_theme_manager_load_theme:
* @theme_dir: the directory of the theme to load
* @type: the type of theme to load
*
* Loads a theme of the given type without adding it to the manager
*
* Returns: (transfer full): The newly loaded theme.
*/
PurpleTheme *purple_theme_manager_load_theme(const gchar *theme_dir, const gchar *type);
G_END_DECLS
#endif /* PURPLE_THEME_MANAGER_H */