Support foreground/background reversing

README.rst

@@ -238,6 +238,7 @@ The only ANSI sequences that colorama converts into win32 calls are::
     ESC [ 0 m       # reset all (colors and brightness)
     ESC [ 1 m       # bright
     ESC [ 2 m       # dim (looks same as normal brightness)
+    ESC [ 7 m       # swap foreground and background
     ESC [ 22 m      # normal brightness
 
     # FOREGROUND:

colorama/ansi.py

@@ -95,6 +95,7 @@ class AnsiStyle(AnsiCodes):
     DIM       = 2
     NORMAL    = 22
     RESET_ALL = 0
+    REVERSE_FORE_BACK = 7
 
 Fore   = AnsiFore()
 Back   = AnsiBack()

colorama/ansitowin32.py

@@ -99,6 +99,7 @@ def get_win32_calls(self):
         if self.convert and winterm:
             return {
                 AnsiStyle.RESET_ALL: (winterm.reset_all, ),
+                AnsiStyle.REVERSE_FORE_BACK: (winterm.reverse_fore_back, ),
                 AnsiStyle.BRIGHT: (winterm.style, WinStyle.BRIGHT),
                 AnsiStyle.DIM: (winterm.style, WinStyle.NORMAL),
                 AnsiStyle.NORMAL: (winterm.style, WinStyle.NORMAL),

colorama/winterm.py

@@ -45,6 +45,12 @@ def reset_all(self, on_stderr=None):
         self.set_attrs(self._default)
         self.set_console(attrs=self._default)
 
+    def reverse_fore_back(self, on_stderr=None):
+        self._back, self._fore = self._fore, self._back
+        self._style = ((self._style & 0xF) << 4) | ((self._style >> 4) & 0xF)
+        self._light = ((self._light & 0xF) << 4) | ((self._light >> 4) & 0xF)
+        self.set_console(on_stderr=on_stderr)
+
     def fore(self, fore=None, light=False, on_stderr=False):
         if fore is None:
             fore = self._default_fore