paleofetch

commit abfa05ec9e1bbe50c3e3ed87e44bcc44f7702afb
parent 133bb33a6f7609a10addaa1cc0cc5f37fdf19c01
Author: Allis IO <0xa111510@gmail.com>
Date:   Wed, 22 Apr 2020 15:32:41 -0400

Get name of terminal emulator from X server

This assumes that the class of the active window matches the name of the
terminal emulator being used to run paleofetch, which seems a safe bet.

We throw away a lot of the result values from `XGetWindowProperty()` on
the belief that the requests are exceedingly unlikely to fail, which is
especially true if we're taking as a given that an X server is running.

Diffstat:
M
paleofetch.c
 | 
22
+++++++++++++++++++++-

1 file changed, 21 insertions(+), 1 deletion(-)
diff --git a/paleofetch.c b/paleofetch.c
@@ -9,6 +9,7 @@
 #include <pci/pci.h>
 
 #include <X11/Xlib.h>
+#include <X11/Xatom.h>
 
 #define DISTRO "Arch"
 #define BUF_SIZE 150
@@ -222,8 +223,27 @@ char *get_resolution() {
 }
 
 char *get_terminal() {
+    Display *display = XOpenDisplay(NULL);
+    unsigned char *prop;
+    unsigned long _, // not unused, but we don't need the results
+                  window = RootWindow(display, XDefaultScreen(display));
+    Atom a,
+         active = XInternAtom(display, "_NET_ACTIVE_WINDOW", True),
+         class = XInternAtom(display, "WM_CLASS", True);
+
+#define GetProp(property) \
+    XGetWindowProperty(display, window, property, 0, 64, 0, 0, &a, (int *)&_, &_, &_, &prop);
+
+    GetProp(active);
+    window = (prop[3] << 24) + (prop[2] << 16) + (prop[1] << 8) + prop[0];
+    free(prop);
+    GetProp(class);
+    XCloseDisplay(display);
+
     char *terminal = malloc(BUF_SIZE);
-    strncpy(terminal, getenv("TERM"), BUF_SIZE);
+    snprintf(terminal, BUF_SIZE, "%s", prop);
+    free(prop);
+
     return terminal;
 }