Color

- Implemented Color::strip which can remove the color codes from a
  string.

src/Color.cpp

@@ -506,6 +506,32 @@ std::string Color::colorize (const std::string& input)
   return input;
 }
 
+////////////////////////////////////////////////////////////////////////////////
+// Remove color codes from a string.
+std::string Color::strip (const std::string& input)
+{
+  int length = input.length ();
+  bool inside = false;
+  std::string output;
+  for (int i = 0; i < length; ++i)
+  {
+    if (inside)
+    {
+      if (input[i] == 'm')
+        inside = false;
+    }
+    else
+    {
+      if (input[i] == 033)
+        inside = true;
+      else
+        output += input[i];
+    }
+  }
+
+  return output;
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 std::string Color::colorize (const std::string& input, const std::string& spec)
 {

src/Color.h

@@ -62,6 +62,7 @@ public:
 
   std::string colorize (const std::string&);
   static std::string colorize (const std::string&, const std::string&);
+  static std::string strip (const std::string&);
 
   bool nontrivial ();
 

test/color.t.cpp

@@ -34,7 +34,7 @@ Context context;
 ////////////////////////////////////////////////////////////////////////////////
 int main (int argc, char** argv)
 {
-  UnitTest t (1033);
+  UnitTest t (1036);
 
   // Names matched to values.
   t.is ((int) Color (""),        (int) Color (Color::nocolor), "''        == Color::nocolor");
@@ -182,6 +182,11 @@ int main (int argc, char** argv)
     t.is (Color::colorize ("foo", color), std::string (codes), description);
   }
 
+  // std::string Color::strip (const std::string&);
+  t.is (Color::strip (""),                  "",    "Color::strip '' -> ''");
+  t.is (Color::strip ("foo"),               "foo", "Color::strip 'foo' -> 'foo'");
+  t.is (Color::strip ("f\033[1mo\033[0mo"), "foo", "Color::strip 'f<b>o</b>o' -> 'foo'");
+
   return 0;
 }