Refactoring: Xmobar.Text.{Ansi,Pango,Output}

1 files changed, 44 insertions, 0 deletions

diff --git a/src/Xmobar/Text/Ansi.hs b/src/Xmobar/Text/Ansi.hs
new file mode 100644
index 0000000..2f1c2c4
--- /dev/null
+++ b/src/Xmobar/Text/Ansi.hs
@@ -0,0 +1,44 @@
+------------------------------------------------------------------------------
+-- |
+-- Module: Xmobar.Text.Ansi
+-- Copyright: (c) 2022 Jose Antonio Ortega Ruiz
+-- License: BSD3-style (see LICENSE)
+--
+-- Maintainer: jao@gnu.org
+-- Stability: unstable
+-- Portability: portable
+-- Created: Fri Feb 4, 2022 01:10
+--
+--
+-- Codification with ANSI (color) escape codes
+--
+------------------------------------------------------------------------------
+
+module Xmobar.Text.Ansi (withAnsiColor) where
+
+import Data.List (intercalate)
+
+asInt :: String -> String
+asInt x = case (reads $ "0x" ++ x)  :: [(Integer, String)] of
+  [(v, "") ] -> show v
+  _ -> ""
+
+namedColor :: String -> String
+namedColor c =
+  case c of
+    "black" -> "0"; "red" -> "1"; "green" -> "2"; "yellow" -> "3"; "blue" -> "4";
+    "magenta" -> "5"; "cyan" -> "6"; "white" -> "7"; _ -> ""
+
+ansiCode :: String -> String
+ansiCode ('#':r:g:[b]) = ansiCode ['#', '0', r, '0', g, '0', b]
+ansiCode ('#':r0:r1:g0:g1:b0:[b1]) =
+  "2;" ++ intercalate ";" (map asInt [[r0,r1], [g0,g1], [b0,b1]])
+ansiCode ('#':n) = ansiCode n
+ansiCode c = "5;" ++ if null i then namedColor c else i where i = asInt c
+
+withAnsiColor :: (String, String) -> String -> String
+withAnsiColor (fg, bg) s = wrap "38;" fg (wrap "48;" bg s)
+  where wrap cd cl w =
+          if null cl
+          then w
+          else "\x1b[" ++ cd ++ ansiCode cl ++ "m" ++ w ++ "\x1b[0m"