From 7883981fe9976b3933959c04fa8cc62158c70855 Mon Sep 17 00:00:00 2001
From: uint23 <abhinav.prsai@gmail.com>
Date: Mon, 14 Apr 2025 22:18:55 +0100
Subject: inital window manager setup. check for other window managers too

---
 Makefile    | 24 ++++++++++++++++++++++++
 src/sxwm.c  | 39 +++++++++++++++++++++++++++++++++++++++
 src/sxwm.h  | 21 +++++++++++++++++++++
 src/util.h  |  8 ++++++++
 src/utils.c | 31 +++++++++++++++++++++++++++++++
 5 files changed, 123 insertions(+)
 create mode 100644 Makefile
 create mode 100644 src/sxwm.c
 create mode 100644 src/sxwm.h
 create mode 100644 src/util.h
 create mode 100644 src/utils.c

diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..2cdfaf1
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,24 @@
+CC = gcc
+CFLAGS = -Wall -Wextra -O2 -g -Isrc
+LDFLAGS = -lX11
+
+SRC_DIR = src
+SRC = $(wildcard $(SRC_DIR)/*.c)
+OBJ = $(SRC:.c=.o)
+BIN = sxwm
+
+all: $(BIN)
+
+$(BIN): $(OBJ)
+	$(CC) -o $@ $^ $(LDFLAGS)
+
+$(SRC_DIR)/%.o: $(SRC_DIR)/%.c
+	$(CC) $(CFLAGS) -c -o $@ $<
+
+x:
+	rm -f $(SRC_DIR)/*.o $(BIN)
+
+r:
+	x all
+
+.PHONY: all clean rebuild
diff --git a/src/sxwm.c b/src/sxwm.c
new file mode 100644
index 0000000..19b8975
--- /dev/null
+++ b/src/sxwm.c
@@ -0,0 +1,39 @@
+#include "sxwm.h"
+#include "util.h"
+
+static void
+run(void)
+{
+	XEvent xev;
+	for (;;) {
+		XNextEvent(dpy, &xev);
+	}
+}
+
+void
+setup(void)
+{
+	dpy = XOpenDisplay(NULL);
+	if (dpy == 0)
+		errx(0, "sxwm: can't open display.");
+
+	root = XDefaultRootWindow(dpy);
+	otherwm();
+	XSelectInput(dpy, root,
+		SubstructureRedirectMask | KeyPressMask | KeyReleaseMask
+	);
+}
+
+int
+main(int ac, char **av)
+{
+	if (ac > 1) {
+		if (strcmp(av[1], "-v") == 0 || strcmp(av[1], "--version") == 0)
+			errx(0, "%s\n%s\n%s\n", SXWM_VERSION, SXWM_AUTHOR, SXWM_LICINFO);
+		else
+			errx(0, "usage:\n[-v || --version]: See the version of sxwm\n");
+	}
+	run();
+	dpy = XOpenDisplay(NULL);
+	return 0;
+}
diff --git a/src/sxwm.h b/src/sxwm.h
new file mode 100644
index 0000000..cb6286c
--- /dev/null
+++ b/src/sxwm.h
@@ -0,0 +1,21 @@
+#ifndef SXWM_H
+#define SXWM_H
+
+#include <string.h>
+#include <err.h>
+#include <X11/Xlib.h>
+
+#define SXWM_VERSION    "sxwm ver. 0.1.0"
+#define SXWM_AUTHOR     "(C) Abhinav Prasai 2025"
+#define SXWM_LICINFO    "See LICENSE for more info"
+
+#define ALT     Mod1Mask
+#define SUPER   Mod4Mask
+#define SHIFT   ShiftMask
+
+static void run(void);
+static void setup(void);
+
+static Display 	*dpy;
+static Window	root;
+#endif
diff --git a/src/util.h b/src/util.h
new file mode 100644
index 0000000..bc77105
--- /dev/null
+++ b/src/util.h
@@ -0,0 +1,8 @@
+#ifndef UTIL_H
+#define UTIL_H
+#include <X11/Xlib.h>
+
+void otherwm(void);
+int otherwmerr(Display *dpy, XErrorEvent *ee);
+
+#endif
diff --git a/src/utils.c b/src/utils.c
new file mode 100644
index 0000000..c99e74c
--- /dev/null
+++ b/src/utils.c
@@ -0,0 +1,31 @@
+#include <err.h>
+#include <X11/Xlib.h>
+#include "util.h"
+
+void
+otherwm(void)
+{
+	XSetErrorHandler(otherwmerr);
+	XChangeWindowAttributes(dpy, root, CWEventMask, 
+			&(XSetWindowAttributes){.event_mask = SubstructureRedirectMask});
+	XSync(dpy, False);
+	XSetErrorHandler(xerr);
+	XSync(dpy, False);
+}
+
+int
+otherwmerr(Display *dpy, XErrorEvent *ee)
+{
+	errx(0, "sxwm: another window manager is already running, please close it");
+	return 0;
+	if (dpy && ee) return 0;
+}
+
+int
+xerr(Display *dpy, XErrorEvent *ee)
+{
+	fprintf(stderr, "sxwm: fatal error\nrequest code:%d\nerror code:%d",
+			ee->request_code, ee->error_code);
+	return 0;
+	if (dpy && ee) return 0;
+}
-- 
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