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#include <sys/stat.h>
#include <fcntl.h>
#include <limits.h>
#include <stdlib.h>
#include <gio/gio.h>
#include <webkit2/webkit-web-extension.h>
#include <webkitdom/webkitdom.h>
#include <webkitdom/WebKitDOMDOMWindowUnstable.h>
#define LENGTH(x) (sizeof(x) / sizeof(x[0]))
#define MSGBUFSZ 32
typedef struct Page {
guint64 id;
WebKitWebPage *webpage;
WebKitDOMDOMWindow *view;
struct Page *next;
} Page;
static int pipein, pipeout;
static Page *pages;
Page *
newpage(WebKitWebPage *page)
{
Page *p;
if (!(p = calloc(1, sizeof(Page))))
die("Cannot malloc!\n");
p->next = pages;
pages = p;
p->id = webkit_web_page_get_id(page);
p->webpage = page;
return p;
}
static void
msgsurf(Page *p, const char *s)
{
char msg[MSGBUFSZ];
int ret;
msg[0] = p ? p->id : 0;
ret = snprintf(&msg[1], sizeof(msg) - 1, "%s", s);
if (ret >= sizeof(msg)) {
fprintf(stderr, "webext: message too long: %d\n", ret);
return;
}
if (pipeout) {
if (write(pipeout, msg, sizeof(msg)) < 0)
fprintf(stderr, "webext: error sending: %s\n", msg);
}
}
static gboolean
readpipe(GIOChannel *s, GIOCondition c, gpointer unused)
{
char msg[MSGBUFSZ];
gsize msgsz;
GError *gerr = NULL;
glong wh, ww;
Page *p;
if (g_io_channel_read_chars(s, msg, LENGTH(msg), &msgsz, &gerr) !=
G_IO_STATUS_NORMAL) {
fprintf(stderr, "webext: error reading pipe: %s\n",
gerr->message);
g_error_free(gerr);
return TRUE;
}
msg[msgsz] = '\0';
for (p = pages; p; p = p->next) {
if (p->id == msg[0])
break;
}
if (!p || !p->view)
return TRUE;
switch (msg[1]) {
case 'h':
ww = webkit_dom_dom_window_get_inner_width(p->view);
webkit_dom_dom_window_scroll_by(p->view,
(ww / 100) * msg[2], 0);
break;
case 'v':
wh = webkit_dom_dom_window_get_inner_height(p->view);
webkit_dom_dom_window_scroll_by(p->view,
0, (wh / 100) * msg[2]);
break;
}
return TRUE;
}
static void
documentloaded(WebKitWebPage *wp, Page *p)
{
p->view = webkit_dom_document_get_default_view(
webkit_web_page_get_dom_document(wp));
}
static void
webpagecreated(WebKitWebExtension *e, WebKitWebPage *wp, gpointer unused)
{
Page *p = newpage(wp);
g_signal_connect(wp, "document-loaded", G_CALLBACK(documentloaded), p);
}
G_MODULE_EXPORT void
webkit_web_extension_initialize_with_user_data(WebKitWebExtension *e, GVariant *gv)
{
GIOChannel *gchanpipe;
g_signal_connect(e, "page-created", G_CALLBACK(webpagecreated), NULL);
g_variant_get(gv, "(ii)", &pipein, &pipeout);
msgsurf(NULL, "i");
gchanpipe = g_io_channel_unix_new(pipein);
g_io_channel_set_encoding(gchanpipe, NULL, NULL);
g_io_channel_set_close_on_unref(gchanpipe, TRUE);
g_io_add_watch(gchanpipe, G_IO_IN, readpipe, NULL);
}
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