String index as progress bar

2 files changed, 10 insertions, 3 deletions

diff --git a/readme.md b/readme.md
index d9ea24b..1b12095 100644
--- a/readme.md
+++ b/readme.md
@@ -792,6 +792,10 @@ These are the options available for all monitors below:
     - Total number of characters used to draw bars.
     - Long option: `--bwidth`
     - Default value: 10
+    - Special value: 0.  When this parameter is 0, the percentage to
+      display is interpreted as a position in the bar foreground
+      string (given by `-f`), and the character at that position is
+      displayed.
 - `-x` _string_ N/A string
     - String to be used when the monitor is not available
     - Long option: `--nastring`
diff --git a/src/Xmobar/Plugins/Monitors/Common/Output.hs b/src/Xmobar/Plugins/Monitors/Common/Output.hs
index c41ef19..4733a9f 100644
--- a/src/Xmobar/Plugins/Monitors/Common/Output.hs
+++ b/src/Xmobar/Plugins/Monitors/Common/Output.hs
@@ -221,9 +221,12 @@ showPercentBar v x = do
   bb <- getConfigValue barBack
   bf <- getConfigValue barFore
   bw <- getConfigValue barWidth
-  let len = min bw $ round (fromIntegral bw * x)
-  s <- colorizeString v (take len $ cycle bf)
-  return $ s ++ take (bw - len) (cycle bb)
+  let c = bw < 1
+      w = if c then length bf else bw
+      len = min w $ round (fromIntegral w * x)
+      bfs = if c then [bf !! (len - 1)] else take len $ cycle bf
+  s <- colorizeString v bfs
+  return $ s ++ if c then "" else take (bw - len) (cycle bb)
 
 showIconPattern :: Maybe IconPattern -> Float -> Monitor String
 showIconPattern Nothing _ = return ""