From 47595b71f3e32c98f7483f7b5f5e59faa02163b2 Mon Sep 17 00:00:00 2001
From: Aki <please@ignore.pl>
Date: Sat, 28 Aug 2021 22:29:46 +0200
Subject: Added naive recognition between images and text

---
 clipfs.c | 68 ++++++++++++++++++++++++++++++++++++++++++++++++++--------------
 1 file changed, 53 insertions(+), 15 deletions(-)

diff --git a/clipfs.c b/clipfs.c
index 10a7dcb..b602947 100644
--- a/clipfs.c
+++ b/clipfs.c
@@ -16,6 +16,13 @@ struct selection
 	xcb_atom_t atom;
 };
 
+enum Status
+{
+	STATUS_TARGETS,
+	STATUS_SELECTION,
+	STATUS_DONE,
+};
+
 int get_selection_index(const char *);
 xcb_window_t find_owner(int);
 void update_selection(int);
@@ -83,15 +90,20 @@ xcb_window_t find_owner(const int i)
 
 void update_selection(const int i)
 {
-	xcb_atom_t TARGET_PROPERTY = get_atom(c, "_TARGET_SELECTION");
-	xcb_atom_t UTF8_STRING = get_atom(c, "UTF8_STRING");  // TODO: Look into ways to support various TARGETS.
+	const xcb_atom_t PROPERTY = get_atom(c, "_RECEIVED_SELECTION");  // TODO: Get intern atoms beforehand.
+	const xcb_atom_t PNG = get_atom(c, "image/png");
+	const xcb_atom_t JPG = get_atom(c, "image/jpg");
+	const xcb_atom_t PIXMAP = get_atom(c, "PIXMAP");  // TODO: Format of this one depends on the application.
+	const xcb_atom_t UTF8_STRING = get_atom(c, "UTF8_STRING");
+	const xcb_atom_t TARGETS = get_atom(c, "TARGETS");  // TODO-multiple: MULTIPLE?
 	if (XCB_WINDOW_NONE == find_owner(i))
 		return;
-	xcb_convert_selection(c, w, x[i].atom, UTF8_STRING, TARGET_PROPERTY, XCB_CURRENT_TIME);
+	xcb_convert_selection(c, w, x[i].atom, TARGETS, PROPERTY, XCB_CURRENT_TIME);
 	xcb_flush(c);
+	xcb_atom_t target = UTF8_STRING;
 	xcb_generic_event_t * e;
-	int done = 0;  // TODO: Look into continuous notifications.
-	while (!done)
+	int status = STATUS_TARGETS;  // TODO: Look into continuous notifications.
+	while (STATUS_DONE != status)
 	{
 		e = xcb_wait_for_event(c);
 		if (NULL == e) return;
@@ -104,17 +116,42 @@ void update_selection(const int i)
 		if (x[i].atom == n->selection && XCB_NONE != n->property)
 		{
 			xcb_get_property_cookie_t cookie = xcb_get_property(
-				c, 1, w, TARGET_PROPERTY, XCB_ATOM_ANY, 0, UINT32_MAX);
+				c, 1, w, PROPERTY, XCB_ATOM_ANY, 0, UINT32_MAX);
 			xcb_get_property_reply_t * reply = xcb_get_property_reply(c, cookie, NULL);
 			if (reply)
 			{
-				const int len = xcb_get_property_value_length(reply);
-				x[i].data = realloc(x[i].data, len);
-				if (NULL == x[i].data)
-					x[i].len = 0;
-				x[i].len = len;
-				memcpy(x[i].data, xcb_get_property_value(reply), len);
-				done = 1;
+				const unsigned len = xcb_get_property_value_length(reply);
+				xcb_atom_t * atoms;
+				switch (status)
+				{
+				case STATUS_TARGETS:
+					atoms = (xcb_atom_t *) xcb_get_property_value(reply);
+					for (unsigned j = 0; j < len / sizeof(xcb_atom_t); ++j)
+					{ // TODO: Find a way to get original format?
+						if (JPG != target && PNG == atoms[j])
+							target = PNG;
+						if (JPG == atoms[j])
+							target = JPG;
+						if (PNG != target && JPG != target && PIXMAP == atoms[j])
+							target = PIXMAP;
+					}
+					xcb_convert_selection(c, w, x[i].atom, target, PROPERTY, XCB_CURRENT_TIME);
+					xcb_flush(c);
+					status = STATUS_SELECTION;
+					break;
+				case STATUS_SELECTION:
+					if (NULL == x[i].data && len != x[i].len)
+						x[i].data = realloc(x[i].data, len);
+					if (NULL == x[i].data)
+						x[i].len = 0;
+					x[i].len = len;
+					memcpy(x[i].data, xcb_get_property_value(reply), len);
+					status = STATUS_DONE;
+					break;
+				case STATUS_DONE:
+				default:
+					break;  // Unreachable
+				}
 				free(reply);
 			}
 		}
@@ -175,10 +212,12 @@ int clip_readdir(
 
 int clip_open(const char * path, struct fuse_file_info * fi)
 {
-	if (-ENOENT == get_selection_index(path))
+	const int i = get_selection_index(path);
+	if (-ENOENT == i)
 		return -ENOENT;
 	if (O_RDONLY != (fi->flags & O_ACCMODE))
 		return -EACCES;
+	update_selection(i);  // TODO: The content is updated way too often.
 	return 0;  // TODO: Maybe queue selection content retrieval here?
 }
 
@@ -189,7 +228,6 @@ int clip_read(const char * path, char * buf, size_t size, off_t offset, struct f
 	const int i = get_selection_index(path);
 	if (-ENOENT == i)
 		return -ENOENT;
-	update_selection(i);  // TODO: The content is updated way too often.
 	if (offset < x[i].len)
 	{
 		if (offset + size > x[i].len)
-- 
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