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/

1 files changed, 126 insertions, 0 deletions

diff --git a/purple-history/purplehistorycore.c b/purple-history/purplehistorycore.c
new file mode 100644
index 0000000000..94d7325332
--- /dev/null
+++ b/purple-history/purplehistorycore.c
@@ -0,0 +1,126 @@
+/*
+ * Purple - Internet Messaging Library
+ * Copyright (C) Pidgin Developers <devel@pidgin.im>
+ *
+ * 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/>.
+ */
+
+#include <stdio.h>
+
+#include <glib.h>
+#include <glib/gstdio.h>
+#include <glib/gi18n-lib.h>
+
+#include <purple.h>
+
+#define PURPLE_COMPILATION
+#include "../libpurple/purpleprivate.h"
+#undef PURPLE_COMPILATION
+
+/******************************************************************************
+ * Helpers
+ *****************************************************************************/
+static gboolean
+purple_history_query(const gchar *query, GError **error) {
+	PurpleHistoryManager *manager = purple_history_manager_get_default();
+	GList *results = NULL;
+
+	results = purple_history_manager_query(manager, query, error);
+
+	if(error != NULL) {
+		return FALSE;
+	}
+
+	while(results != NULL) {
+		PurpleMessage *message = PURPLE_MESSAGE(results->data);
+
+		g_printf("%s: %s\n", purple_message_get_author(message),
+		         purple_message_get_contents(message));
+
+		g_clear_object(&message);
+		results = g_list_delete_link(results, results);
+	}
+
+	return TRUE;
+}
+
+static gboolean
+purple_history_remove(const gchar *query, GError **error) {
+	PurpleHistoryManager *manager = purple_history_manager_get_default();
+	gboolean success = FALSE;
+
+	success = purple_history_manager_remove(manager, query, error);
+
+	if(!success) {
+		return FALSE;
+	}
+
+	if(error) {
+		g_printf("Remove successful\n");
+	}
+
+	return TRUE;
+}
+
+/******************************************************************************
+ * Main
+ *****************************************************************************/
+gint
+main(gint argc, gchar *argv[]) {
+	GError *error = NULL;
+	GOptionContext *ctx = NULL;
+	GOptionGroup *group = NULL;
+	gint exit_code = EXIT_SUCCESS;
+
+	ctx = g_option_context_new(_("QUERY"));
+	g_option_context_set_help_enabled(ctx, TRUE);
+	g_option_context_set_summary(ctx, _("Query purple message history"));
+	g_option_context_set_translation_domain(ctx, GETTEXT_PACKAGE);
+
+	group = purple_get_option_group();
+	g_option_context_add_group(ctx, group);
+
+	g_option_context_parse(ctx, &argc, &argv, &error);
+	g_option_context_free(ctx);
+
+	if(error != NULL) {
+		g_fprintf(stderr, "%s\n", error->message);
+
+		g_clear_error(&error);
+
+		return EXIT_FAILURE;
+	}
+
+	purple_history_manager_startup();
+
+	for(gint i = 1; i < argc; i++) {
+		if(argv[i] == NULL || *argv[i] == '\0') {
+			continue;
+		}
+
+		if(!purple_history_query(argv[i], &error)) {
+			fprintf(stderr, "query failed: %s\n",
+			        error ? error->message : "unknown error");
+
+			g_clear_error(&error);
+
+			exit_code = EXIT_FAILURE;
+		}
+	}
+
+	purple_history_manager_shutdown();
+
+	return exit_code;
+}
+