Attaching arbitrary data to documents in a Geany plugin.

documentmanager.c

#include "documentmanager.h"

static GHashTable *geany_document_data = NULL;

static GData **geany_document_data_new(void)
{
	GData **doc_data = g_slice_new0(GData*);
	g_datalist_init(doc_data);
	return doc_data;
}

static void geany_document_data_free(gpointer pdata)
{
	if (G_LIKELY(pdata != NULL))
	{
		GData **doc_data = pdata;
		g_datalist_clear(doc_data);
		g_slice_free(GData*, doc_data);
	}
}

static void geany_document_on_open(G_GNUC_UNUSED GObject *object, GeanyDocument *doc, G_GNUC_UNUSED gpointer user_data)
{
	g_hash_table_insert(geany_document_data, doc, geany_document_data_new());
}

static void geany_document_on_close(G_GNUC_UNUSED GObject *object, GeanyDocument *doc, G_GNUC_UNUSED gpointer user_data)
{
	g_hash_table_remove(geany_document_data, doc);
}

void geany_document_manager_init(GeanyPlugin *plugin)
{
	g_return_if_fail(plugin != NULL);
	g_return_if_fail(geany_document_data == NULL);

	geany_document_data = g_hash_table_new_full(g_direct_hash, g_direct_equal, NULL, geany_document_data_free);
	plugin_signal_connect(plugin, NULL, "document-new", TRUE, G_CALLBACK(geany_document_on_open), NULL);
	plugin_signal_connect(plugin, NULL, "document-open", TRUE, G_CALLBACK(geany_document_on_open), NULL);
	plugin_signal_connect(plugin, NULL, "document-close", TRUE, G_CALLBACK(geany_document_on_close), NULL);

	for (gsize i = 0; i < plugin->geany_data->documents_array->len; i++)
	{
		GeanyDocument *doc = plugin->geany_data->documents_array->pdata[i];
		if (G_LIKELY(DOC_VALID(doc)))
			g_hash_table_insert(geany_document_data, doc, geany_document_data_new());
	}
}

void geany_document_manager_cleanup(void)
{
	g_return_if_fail(geany_document_data != NULL);
	g_hash_table_destroy(geany_document_data);
	geany_document_data = NULL;
}

gpointer geany_document_get_data(const GeanyDocument *doc, const gchar *key)
{
	GData **doc_data;
	g_return_val_if_fail(DOC_VALID(doc), NULL);
	g_return_val_if_fail(key != NULL, NULL);
	doc_data = g_hash_table_lookup(geany_document_data, doc);
	g_return_val_if_fail(doc_data != NULL, NULL);
	return g_datalist_get_data(doc_data, key);
}

void geany_document_set_data(GeanyDocument *doc, const gchar *key, gpointer data)
{
	geany_document_set_data_full(doc, key, data, NULL);
}

void geany_document_set_data_full(GeanyDocument *doc, const gchar *key,
	gpointer data, GDestroyNotify free_func)
{
	GData **doc_data;
	g_return_if_fail(DOC_VALID(doc));
	g_return_if_fail(key != NULL);
	doc_data = g_hash_table_lookup(geany_document_data, doc);
	g_return_if_fail(doc_data != NULL);
	g_datalist_set_data_full(doc_data, key, data, free_func);
}

documentmanager.h

#ifndef GEANY_DOCUMENT_MANAGER_H
#define GEANY_DOCUMENT_MANAGER_H 1

#include <geanyplugin.h>

G_BEGIN_DECLS

void geany_document_manager_init(GeanyPlugin *plugin);
void geany_document_manager_cleanup(void);

gpointer geany_document_get_data(const GeanyDocument *doc, const gchar *key);
void geany_document_set_data(GeanyDocument *doc, const gchar *key, gpointer data);
void geany_document_set_data_full(GeanyDocument *doc, const gchar *key, gpointer data, GDestroyNotify free_func);

G_END_DECLS

#endif /* GEANY_DOCUMENT_MANAGER_H */

plugin.c

#include "documentmanager.h"

static gboolean init(GeanyPlugin *plugin, gpointer pdata)
{
	geany_document_manager_init(plugin);
	/* ... regular plugin initialization here ... */
	return TRUE;
}

static void cleanup(GeanyPlugin *plugin, gpointer pdata)
{
	/* ... regular plugin finalization here ... */
	geany_document_manager_cleanup();
}

G_MODULE_EXPORT
void geany_load_module(GeanyPlugin *plugin)
{
	plugin->info->name = _("Document Data Plugin");
	plugin->info->description = _("A plugin which attaches data to documents");
	plugin->info->version = "0.1";
	plugin->info->author = "Matthew Brush";

	plugin->funcs->init = init;
	plugin->funcs->cleanup = cleanup;

	GEANY_PLUGIN_REGISTER(plugin, 228);
}