Makefile: rework how webextensions are handled

1 files changed, 128 insertions, 0 deletions

diff --git a/webext-surf.c b/webext-surf.c
new file mode 100644
index 0000000..ec9a235
--- /dev/null
+++ b/webext-surf.c
@@ -0,0 +1,128 @@
+#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>
+
+#include "common.h"
+
+#define LENGTH(x)   (sizeof(x) / sizeof(x[0]))
+
+typedef struct Page {
+	guint64 id;
+	WebKitWebPage *webpage;
+	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)
+{
+	static char msg[MSGBUFSZ];
+	size_t sln = strlen(s);
+	int ret;
+
+	if ((ret = snprintf(msg, sizeof(msg), "%c%c%s",
+	                    2 + sln, p ? p->id : 0, s))
+	    >= sizeof(msg)) {
+		fprintf(stderr, "webext: message too long: %d\n", ret);
+		return;
+	}
+
+	if (pipeout && write(pipeout, msg, sizeof(msg)) < 0)
+		fprintf(stderr, "webext: error sending: %.*s\n", ret-2, msg+2);
+}
+
+static gboolean
+readpipe(GIOChannel *s, GIOCondition c, gpointer unused)
+{
+	static char msg[MSGBUFSZ], msgsz;
+	WebKitDOMDOMWindow *view;
+	GError *gerr = NULL;
+	glong wh, ww;
+	Page *p;
+
+	if (g_io_channel_read_chars(s, msg, LENGTH(msg), NULL, &gerr) !=
+	    G_IO_STATUS_NORMAL) {
+		fprintf(stderr, "webext: error reading pipe: %s\n",
+		        gerr->message);
+		g_error_free(gerr);
+		return TRUE;
+	}
+	if ((msgsz = msg[0]) < 3) {
+		fprintf(stderr, "webext: message too short: %d\n", msgsz);
+		return TRUE;
+	}
+
+	for (p = pages; p; p = p->next) {
+		if (p->id == msg[1])
+			break;
+	}
+	if (!p || !(view = webkit_dom_document_get_default_view(
+	            webkit_web_page_get_dom_document(p->webpage))))
+		return TRUE;
+
+	switch (msg[2]) {
+	case 'h':
+		if (msgsz != 4)
+			return TRUE;
+		ww = webkit_dom_dom_window_get_inner_width(view);
+		webkit_dom_dom_window_scroll_by(view,
+		                                (ww / 100) * msg[3], 0);
+		break;
+	case 'v':
+		if (msgsz != 4)
+			return TRUE;
+		wh = webkit_dom_dom_window_get_inner_height(view);
+		webkit_dom_dom_window_scroll_by(view,
+		                                0, (wh / 100) * msg[3]);
+		break;
+	}
+
+	return TRUE;
+}
+
+static void
+webpagecreated(WebKitWebExtension *e, WebKitWebPage *wp, gpointer unused)
+{
+	Page *p = newpage(wp);
+}
+
+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);
+}