Finally hook up the mkdir code to a syscall.

Added a /bin/mkdir that makes directories. How very neat :^)
There are various limitations because of missing functionality.

AK/FileSystemPath.cpp

@@ -30,15 +30,32 @@ bool FileSystemPath::canonicalize(bool resolveSymbolicLinks)
             canonicalParts.append(part);
     }
     if (canonicalParts.isEmpty()) {
-        m_string = "/";
+        m_string = m_basename = m_dirname = "/";
         return true;
     }
-    StringBuilder builder;
-    for (auto& cpart : canonicalParts) {
-        builder.append('/');
-        builder.append(move(cpart));
+
+    m_basename = canonicalParts.last();
+
+    if (canonicalParts.size() == 1) {
+        m_dirname = "/";
+    } else {
+        StringBuilder builder;
+        for (size_t i = 0; i < canonicalParts.size() - 1; ++i) {
+            auto& cpart = canonicalParts[i];
+            builder.append('/');
+            builder.append(cpart);
+        }
+        m_dirname = builder.build();
+    }
+
+    {
+        StringBuilder builder;
+        for (auto& cpart : canonicalParts) {
+            builder.append('/');
+            builder.append(move(cpart));
+        }
+        m_string = builder.build();
     }
-    m_string = builder.build();
     return true;
 }
 

AK/FileSystemPath.h

@@ -12,10 +12,15 @@ public:
     bool isValid() const { return m_isValid; }
     String string() const { return m_string; }
 
+    String basename() const { return m_basename; }
+    String dirname() const { return m_dirname; }
+
 private:
     bool canonicalize(bool resolveSymbolicLinks = false);
 
     String m_string;
+    String m_dirname;
+    String m_basename;
     bool m_isValid { false };
 };
 

AK/StringBuilder.cpp

@@ -7,6 +7,11 @@ void StringBuilder::append(String&& str)
     m_strings.append(move(str));
 }
 
+void StringBuilder::append(const String& str)
+{
+    m_strings.append(str);
+}
+
 void StringBuilder::append(char ch)
 {
     m_strings.append(StringImpl::create(&ch, 1));

AK/StringBuilder.h

@@ -10,6 +10,7 @@ public:
     StringBuilder() { }
     ~StringBuilder() { }
 
+    void append(const String&);
     void append(String&&);
     void append(char);