Extend ANSI module to support more colors and also background colors.

ansi.scm

@@ -60,6 +60,38 @@
      (#:magenta . 35)
      (#:cyan . 36)
      (#:white . 37)
+     (#:grey . 37)
+     (#:brightblack . 90)
+     (#:darkgrey . 90)
+     (#:brightred . 91)
+     (#:brightgreen . 92)
+     (#:brightyellow . 93)
+     (#:brightblue . 94)
+     (#:brightmagenta . 95)
+     (#:pink . 95)
+     (#:brightcyan . 96)
+     (#:brightwhite . 97)
+
+     (#:bgblack . 40)
+     (#:bgred . 41)
+     (#:bggreen . 42)
+     (#:bgyellow . 43)
+     (#:bgblue . 44)
+     (#:bgmagenta . 45)
+     (#:bgcyan . 46)
+     (#:bgwhite . 47)
+     (#:bggrey . 47)
+     (#:bgbrightblack . 100)
+     (#:bgdarkgrey . 100)
+     (#:bgbrightred . 101)
+     (#:bgbrightgreen . 102)
+     (#:bgbrightyellow . 103)
+     (#:bgbrightblue . 104)
+     (#:bgbrightmagenta . 105)
+     (#:bgpink . 105)
+     (#:bgbrightcyan . 106)
+     (#:bgbrightwhite . 107)
+
      (#:default . 0)
      (#:bold . 1)))