HGKeeper

* DiffTopic - Show the old topic when the topic in a chat room changes.

* 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, write to the Free Software

* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA

* 02111-1301, USA.

/* If you can't figure out what this line is for, DON'T TOUCH IT. */

#include "../common/pp_internal.h"

#define PLUGIN_ID "gtk-plugin_pack-difftopic"

#define PLUGIN_STATIC_NAME "difftopic"

#define PLUGIN_AUTHOR "Sadrul H Chowdhury <sadrul@users.sourceforge.net>"

/* System headers */

#include <ctype.h>

#include <string.h>

/* Pidgin Headers */

#include <gtkconv.h>

#include <gtkimhtml.h>

#include <gtkplugin.h>

#define SAME(a,b) ((isalnum((a)) && isalnum((b))) || (!isalnum((a)) && !isalnum((b))))

#define SIZE 1000 /* XXX: Let's assume this always holds */

static int lcs[SIZE][SIZE];

static GList *

split_string(const char *string)

{

GList *ret = NULL;

const char *start, *end;

start = end = string;

while (*start) {

while (*end && SAME(*start, *end)) {

end++;

}

ret = g_list_append(ret, g_strndup(start, end - start));

start = end;

}

return ret;

}

static GString *

g_string_prepend_printf(GString *string, const char *format, ...)

{

va_list args;

char *str;

va_start(args, format);

str = g_strdup_vprintf(format, args);

va_end(args);

string = g_string_prepend(string, str);

g_free(str);

return string;

}

/* Let's LCS */

static void

have_fun(GtkIMHtml *imhtml, const char *old, const char *new)

{

GList *lold, *lnew;

int i, j, m, n;

GString *from, *to;

char *text;

lold = split_string(old);

lnew = split_string(new);

memset(lcs, 0, sizeof(lcs));

n = g_list_length(lold);

m = g_list_length(lnew);

for (i = 1; i <= n; i++)

lcs[i][0] = 0;

for (j = 1; j <= m; j++)

lcs[0][j] = 0;

for (i = 1; i <= n; i++) {

for (j = 1; j <= m; j++) {

if (strcmp(g_list_nth_data(lold, i-1), g_list_nth_data(lnew, j-1)) == 0)

lcs[i][j] = lcs[i-1][j-1] + 1;

else

lcs[i][j] = (lcs[i-1][j] >= lcs[i][j-1] ? lcs[i-1][j] : lcs[i][j-1]);

}

from = g_string_new(NULL);

to = g_string_new(NULL);

i = n;

j = m;

while (i && j) {

if (lcs[i][j] == lcs[i-1][j]) {

from = g_string_prepend_printf(from, "%s",

g_list_nth_data(lold, i - 1));

i--;

} else if (lcs[i][j] == lcs[i][j-1]) {

to = g_string_prepend_printf(to, "%s",

g_list_nth_data(lnew, j - 1));

j--;

} else if (lcs[i][j] == lcs[i-1][j-1] + 1) {

from = g_string_prepend_printf(from, "%s", g_list_nth_data(lold, i-1));

to = g_string_prepend_printf(to, "%s", g_list_nth_data(lnew, j-1));

i--;

j--;

}

while (j) {

to = g_string_prepend_printf(to, "%s",

g_list_nth_data(lnew, j - 1));

j--;

}

while (i) {

from = g_string_prepend_printf(from, "%s",

g_list_nth_data(lold, i - 1));

i--;

}

text = g_strdup_printf(_(" Topic changed from: %s To: %s"), from->str, to->str);

gtk_imhtml_append_text(GTK_IMHTML(imhtml), text, 0);

g_free(text);

g_string_free(from, TRUE);

g_string_free(to, TRUE);

g_list_foreach(lold, (GFunc)g_free, NULL);

g_list_foreach(lnew, (GFunc)g_free, NULL);

g_list_free(lold);

g_list_free(lnew);

}

static void

topic_changed(PurpleConversation *conv, const char *who, const char *what)

{

PidginConversation *gtkconv = conv->ui_data;

char *old;

old = g_object_get_data(G_OBJECT(gtkconv->imhtml), "difftopic");

if (old && what) {

have_fun(GTK_IMHTML(gtkconv->imhtml), old, what);

}

g_object_set_data_full(G_OBJECT(gtkconv->imhtml), "difftopic", g_strdup(what), (GDestroyNotify)g_free);

}

static gboolean

plugin_load(PurplePlugin *plugin)

{

purple_signal_connect(purple_conversations_get_handle(), "chat-topic-changed",

plugin, PURPLE_CALLBACK(topic_changed), NULL);

/* Set the topic to the opened chat windows */

return TRUE;

}

static gboolean

plugin_unload(PurplePlugin *plugin)

{

return TRUE;

}

static PurplePluginInfo info =

{

PURPLE_PLUGIN_MAGIC, /* Magic */

PURPLE_MAJOR_VERSION, /* Purple Major Version */

PURPLE_MINOR_VERSION, /* Purple Minor Version */

PURPLE_PLUGIN_STANDARD, /* plugin type */

PIDGIN_PLUGIN_TYPE, /* ui requirement */

0, /* flags */

NULL, /* dependencies */

PURPLE_PRIORITY_DEFAULT,/* priority */

PLUGIN_ID, /* plugin id */

NULL, /* name */

PP_VERSION, /* version */

NULL, /* summary */

NULL, /* description */

PLUGIN_AUTHOR, /* author */

PP_WEBSITE, /* website */

plugin_load, /* load */

plugin_unload, /* unload */

NULL, /* destroy */

NULL, /* ui_info */

NULL, /* extra_info */

NULL, /* prefs_info */

NULL, /* actions */

NULL,

NULL

};

static void

init_plugin(PurplePlugin *plugin)

{

#ifdef ENABLE_NLS

bindtextdomain(GETTEXT_PACKAGE, PP_LOCALEDIR);

bind_textdomain_codeset(GETTEXT_PACKAGE, "UTF-8");

#endif /* ENABLE_NLS */

info.name = _("DiffTopic");

info.summary = _("Show the old topic when the topic in a chat room changes.");

info.description = _("Show the old topic when the topic in a chat room changes.");

}

PURPLE_INIT_PLUGIN(PLUGIN_STATIC_NAME, init_plugin, info)

pidgin/purple-plugin-pack