Refactor color functions to provide a unified interface for fore/back ground.

Nim's `terminal` library provides ANSI terminal escape support, but
only when writing directly to a File handle. This commit adds the
`term{FG,BG}` procedures and `termReset` constant to help with embedding
ANSI escape codes in string data.

cliutils.nim

@@ -1,4 +1,4 @@
-import docopt, json, osproc, posix, nre, streams, strtabs, unicode
+import docopt, json, osproc, posix, nre, streams, strtabs, terminal, unicode
 import os except sleep
 import strutils except toUpper, toLower
 
@@ -8,6 +8,8 @@ type
     docopt*: Table[string, Value]
     json*: JsonNode
 
+  TermColor = ForegroundColor or BackgroundColor
+
 proc getVal*(cfg: CombinedConfig, key, default: string): string =
   let argKey = "--" & key
   let envKey = key.replace('-', '_').toUpper
@@ -171,3 +173,13 @@ proc daemonize*(pidfile, si, so, se: string, daemonMain: proc(): void): Pid =
     daemonMain()
 
   return pid1
+
+const termReset* = "\e[0;m"
+
+proc termColor*(color: TermColor, bright, bold = false): string =
+  var colorVal = ord(color)
+  if bright: inc(colorVal, 60)
+  return "\e[" & $colorVal & (if bold: ";1" else: "") & "m"
+
+proc withColor*(str: string, color: TermColor, bright, bold = false): string =
+  return termColor(color, bright, bold) & str

cliutils.nimble

@@ -1,6 +1,6 @@
 # Package
 
-version       = "0.3.5"
+version       = "0.4.1"
 author        = "Jonathan Bernard"
 description   = "Helper functions for writing command line interfaces."
 license       = "MIT"