From 7f598bac4639258ec66cbb572a625f85cfa1c77e Mon Sep 17 00:00:00 2001
From: Jakob Kaivo <jkk@ung.org>
Date: Mon, 9 May 2022 23:00:43 -0400
Subject: initial commit

---
 xsnap.c | 178 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 178 insertions(+)
 create mode 100644 xsnap.c

(limited to 'xsnap.c')

diff --git a/xsnap.c b/xsnap.c
new file mode 100644
index 0000000..df5d55c
--- /dev/null
+++ b/xsnap.c
@@ -0,0 +1,178 @@
+#define _POSIX_C_SOURCE 200809L
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <X11/Xlib.h>
+
+/* MAJE_LDLIB=-lX11 */
+
+#define WM_STATE_FORMAT	32
+
+static Bool is_normal(Display *dpy, Window win)
+{
+	static Atom state = None;
+	if (state == None) {
+		state = XInternAtom(dpy, "WM_STATE", True);
+		if (state == None) {
+			return False;
+		}
+	}
+
+	Atom type = AnyPropertyType;
+	int format = WM_STATE_FORMAT;
+	unsigned long nitems = 0;
+	unsigned long bytes = 0;
+	unsigned char *prop = NULL;
+
+	int r = XGetWindowProperty(dpy,
+		win,
+		state,
+		0,
+		0,
+		False,
+		type,
+		&type,
+		&format,
+		&nitems,
+		&bytes,
+		&prop);
+
+	if (r == Success && prop != NULL) {
+		XFree(prop);
+		return True;
+	}
+
+	return False;
+}
+
+static Window find_normal_parent(Display *dpy, Window win)
+{
+	if (win == PointerRoot || win == None || is_normal(dpy, win)) {
+		return win;
+	}
+
+	Window root = win, parent = win, *children = NULL;
+	unsigned int nchildren = 0;
+	if (!XQueryTree(dpy, win, &root, &parent, &children, &nchildren)) {
+		return None;
+	}
+
+	if (parent == win || is_normal(dpy, parent)) {
+		return parent;
+	}
+
+	return find_normal_parent(dpy, win);
+}
+
+static int xsnap_error(Display *dpy, XErrorEvent *e)
+{
+	char buf[BUFSIZ];
+	XGetErrorText(dpy, e->error_code, buf, sizeof(buf));
+	fprintf(stderr, "xsnap: %s\n", buf);
+	exit(1);
+}
+
+int main(int argc, char *argv[])
+{
+	enum { NONE, LEFT, RIGHT, UP, DOWN } dir = NONE;
+
+	int c = 0;
+	while ((c = getopt(argc, argv, "lrud")) != -1) {
+		switch (c) {
+		case 'l':
+			dir = LEFT;
+			break;
+
+		case 'r':
+			dir = RIGHT;
+			break;
+
+		case 'u':
+			dir = UP;
+			break;
+
+		case 'd':
+			dir = DOWN;
+			break;
+
+		default:
+			return 1;
+		}
+	}
+
+	if (dir == NONE) {
+		fprintf(stderr, "xsnap: missing direction\n");
+		return 1;
+	}
+
+	/* TODO: if operand, use that, otherwise find focused */
+
+	Display *dpy = XOpenDisplay(NULL);
+	XSetErrorHandler(xsnap_error);
+
+	Window root = XDefaultRootWindow(dpy);
+
+	Window focused = root;
+	int revert = RevertToNone;
+	XGetInputFocus(dpy, &focused, &revert);
+	focused = find_normal_parent(dpy, focused);
+
+	XWindowAttributes rootattr = { 0 };
+	XGetWindowAttributes(dpy, root, &rootattr);
+
+	XWindowAttributes attributes = { 0 };
+	XGetWindowAttributes(dpy, focused, &attributes);
+
+	if (!attributes.override_redirect) {
+		fprintf(stderr, "can't override redirect\n");
+		exit(1);
+	}
+
+	int x = 0;
+	int y = 0;
+	unsigned w = 0;
+	unsigned h = 0;
+
+	switch (dir) {
+	case LEFT:
+		x = 0;
+		y = 0;
+		w = rootattr.width / 2;
+		h = rootattr.height;
+		break;
+
+	case RIGHT:
+		x = rootattr.width / 2;
+		y = 0;
+		w = rootattr.width / 2;
+		h = rootattr.height;
+		break;
+
+	case UP:
+		x = 0;
+		y = 0;
+		w = rootattr.width;
+		h = rootattr.height / 2;
+		break;
+
+	case DOWN:
+		x = 0;
+		y = rootattr.height / 2;
+		w = rootattr.width;
+		h = rootattr.height / 2;
+		break;
+
+	default:
+		fprintf(stderr, "somehow missing direction\n");
+		return 1;
+		break;
+	}
+
+	int r = XMoveResizeWindow(dpy, focused, x, y, w ? w : 1, h ? h : 1);
+	if (r != 0) {
+		XErrorEvent e = { .error_code = r };
+		xsnap_error(dpy, &e);
+	}
+
+	return 0;
+}
-- 
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