basic Window Manager detection

src/modules/wm.c

@@ -0,0 +1,58 @@
+#include "fastfetch.h"
+
+#include <dirent.h>
+
+static void parseProcessName(const char* name, char* buffer)
+{
+    if(strcasecmp(name, "kwin_wayland") == 0)
+        strcpy(buffer, "KWin (Wayland)");
+    else if(strcasecmp(name, "kwin_x11") == 0)
+        strcpy(buffer, "KWin (X11)");        
+}
+
+void ffPrintWM(FFinstance* instance)
+{
+    DIR* proc = opendir("/proc/");
+    if(proc == NULL)
+    {
+        ffPrintError(instance, "WM", "opendir(\"/proc/\") == NULL");
+        return;
+    }
+
+    struct dirent* dirent;
+
+    char name[32];
+    name[0] = '\0';
+
+    while((dirent = readdir(proc)) != NULL)
+    {
+        if(dirent->d_type != DT_DIR)
+            continue;
+
+        char path[20];
+        sprintf(path, "/proc/%.8s/comm", dirent->d_name);
+
+        char comm[17]; //MAX_COMM_LENGTH is 17 + null terminator
+        ffGetFileContent(path, comm, sizeof(comm));
+
+        if(comm[0] == '\0')
+            continue;
+
+        parseProcessName(comm, name);
+
+        if(name[0] != '\0')
+            break;
+    }
+
+    closedir(proc);
+
+    if(name[0] == '\0')
+    {
+        ffPrintError(instance, "WM", "No process name matches the name of known display managers");
+    }
+    else
+    {
+        ffPrintLogoAndKey(instance, "WM");
+        puts(name);
+    }
+}