From e8e4415b7eba49d2d6ddb18ab13b3151c9a787bd Mon Sep 17 00:00:00 2001
From: Alexander Shabalin <shabalyn.a@gmail.com>
Date: Thu, 4 Sep 2014 22:53:06 +0400
Subject: Add DynamicString as an alternative to vbars.

* DynamicString is an Int -> String which takes a value from 0..8
  and produces a string with this value embedded. Usefull for replacing
  vbars with icons: an icon per one of 9 states.
* API is similar to that of vbar.
* Default parser of DynamicString produces a function of `i` to a string
  that replaces all occurences of "%%" with `show i`
---
 src/Plugins/Monitors/Common.hs | 36 ++++++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)

diff --git a/src/Plugins/Monitors/Common.hs b/src/Plugins/Monitors/Common.hs
index 971de16..ed91c73 100644
--- a/src/Plugins/Monitors/Common.hs
+++ b/src/Plugins/Monitors/Common.hs
@@ -40,6 +40,8 @@ module Plugins.Monitors.Common (
                        , parseTemplate'
                        -- ** String Manipulation
                        -- $strings
+                       , DynamicString
+                       , parseDynamicString
                        , padString
                        , showWithPadding
                        , showWithColors
@@ -48,8 +50,10 @@ module Plugins.Monitors.Common (
                        , showPercentsWithColors
                        , showPercentBar
                        , showVerticalBar
+                       , showDynamicString
                        , showLogBar
                        , showLogVBar
+                       , showLogDynamicString
                        , showWithUnits
                        , takeDigits
                        , showDigits
@@ -348,6 +352,18 @@ combine m ((s,ts,ss):xs) =
 
 -- $strings
 
+type DynamicString = Int -> String
+
+parseDynamicString :: String -> DynamicString
+parseDynamicString path =
+    let spl = splitOnPercent path
+    in \i -> concat $ intersperse (show i) spl
+  where splitOnPercent [] = [[]]
+        splitOnPercent ('%':'%':xs) = [] : splitOnPercent xs
+        splitOnPercent (x:xs) =
+            let rest = splitOnPercent xs
+            in (x : head rest) : tail rest
+
 type Pos = (Int, Int)
 
 takeDigits :: Int -> Float -> Float
@@ -453,6 +469,15 @@ showPercentBar v x = do
   s <- colorizeString v (take len $ cycle bf)
   return $ s ++ take (bw - len) (cycle bb)
 
+showDynamicString :: Maybe DynamicString -> Float -> Monitor String
+showDynamicString Nothing _ = return ""
+showDynamicString (Just str) x = return $ str $ convert $ 100 * x
+  where convert val
+          | t <= 0 = 0
+          | t > 8 = 8
+          | otherwise = t
+          where t = round val `div` 12
+
 showVerticalBar :: Float -> Float -> Monitor String
 showVerticalBar v x = colorizeString v [convert $ 100 * x]
   where convert :: Float -> Char
@@ -485,3 +510,14 @@ showLogVBar f v = do
                | x <= ll = 1 / bw
                | otherwise = f + logBase 2 (x / hh) / bw
   showVerticalBar v $ choose v
+
+showLogDynamicString :: Maybe DynamicString -> Float -> Float -> Monitor String
+showLogDynamicString str f v = do
+  h <- fromIntegral `fmap` getConfigValue high
+  l <- fromIntegral `fmap` getConfigValue low
+  bw <- fromIntegral `fmap` getConfigValue barWidth
+  let [ll, hh] = sort [l, h]
+      choose x | x == 0.0 = 0
+               | x <= ll = 1 / bw
+               | otherwise = f + logBase 2 (x / hh) / bw
+  showDynamicString str $ choose v
-- 
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