Merge pull request #1854 from CyberShadow/pull-20170802-220958

Add hex viewer runnable example

Author: wilzbach

index.dd

@@ -123,6 +123,24 @@ void main()
 }
 ----
 )
+$(EXTRA_EXAMPLE_RUNNABLE Print hex dump,
+----
+void main()
+{
+    import std.algorithm, std.stdio, std.file;
+    enum cols = 16;
+    // Split file into 16-byte chunks per row
+    thisExePath.File("rb").byChunk(cols).each!(chunk =>
+        // Use range formatting to format the
+        // hexadecimal part and align the text part
+        writefln!"%(%02X %)%*s  %s"(
+            chunk,
+            3 * (cols - chunk.length), "", // Padding
+            chunk.map!(c => // Replace non-printable
+                c < 0x20 || c > 0x7E ? '.' : char(c))));
+}
+----
+)
 $(EXTRA_EXAMPLE Start a minimal web server,
 ----
 #!/usr/bin/env dub