Update window title with (on <client_machine>) if client is remote

src/wmtitle.cc

@@ -526,6 +526,12 @@ void YFrameTitleBar::paint(Graphics &g, const YRect &/*r*/) {
     }
 
     mstring title = getFrame()->getTitle();
+    char *client_machine = getFrame()->client()->fetchClientMachine();
+    if (client_machine != nullptr && strncmp(client_machine, xapp->getLocalHostname(), strlen(client_machine)) != 0) {
+        title = title + "  (on " + client_machine + ")";
+        free(client_machine);
+    }
+
     int const fontHeight = titleFont ? titleFont->height() : 8;
     int const fontAscent = titleFont ? titleFont->ascent() : 6;
     int const yPos(int(height() - fontHeight) / 2 +

src/ywindow.cc

@@ -196,6 +196,18 @@ bool YWindow::fetchTitle(char** title) {
     return XFetchName(xapp->display(), handle(), title);
 }
 
+char* YWindow::fetchClientMachine() {
+    XTextProperty prop;
+    int ret = XGetTextProperty(xapp->display(), handle(), &prop, XA_WM_CLIENT_MACHINE);
+    if (ret) {
+        char *retval = (char *)malloc(sizeof(char)*prop.nitems + 1);
+        strncpy(retval, (const char *)prop.value, prop.nitems + 1);
+        XFree(prop.value);
+        return retval;
+    }
+        return nullptr;
+}
+
 void YWindow::setClassHint(char const * rName, char const * rClass) {
     XClassHint wmclass;
     wmclass.res_name = const_cast<char *>(rName);

src/ywindow.h

@@ -98,6 +98,7 @@ class YWindow : protected YWindowList, private YWindowNode {
     void setWindowFocus(Time timestamp = CurrentTime);
 
     bool fetchTitle(char** title);
+    char* fetchClientMachine();
     void setTitle(char const * title);
     void setClassHint(char const * rName, char const * rClass);
 

src/yxapp.h

@@ -5,6 +5,7 @@
 #include "ywindow.h"
 #include "ycursor.h"
 #include <X11/Xutil.h>
+#include <unistd.h>
 
 #define KEY_MODMASK(x) ((x) & (xapp->KeyMask))
 
@@ -102,6 +103,16 @@ class YXApplication: public YApplication {
     YXApplication(int *argc, char ***argv, const char *displayName = nullptr);
     virtual ~YXApplication();
 
+    char localHostname[256] = {};
+    char * getLocalHostname() {
+        if (localHostname[0] == 0) {
+            gethostname(localHostname, sizeof(localHostname));
+        }
+
+        return localHostname;
+    }
+
+
     Display * display()   const { return fDisplay; }
     int screen()          const { return fScreen; }
     Window root()         const { return fRoot; }