Add bashrc.lscolors script

This file is sourced by .bashrc and exports LSCOLORS (for OS X systems).
If the .dircolors file exists in the user's home directory, then it is
passed to the dircolors utility (if it exists) and the output is
evaluated to configure GNU ls coloring.

bashrc.lscolors

@@ -0,0 +1,55 @@
+#!/bin/bash
+
+if [[ "`uname`" == *"Darwin"* ]]
+then
+    # OS X uses BSD ls which is relatively restricted compared to
+    # GNU ls as far as coloring options go. Stick to the basics here.
+    # LSCOLORS is in pairs (fgcolor, bgcolor)
+
+    # Colorscheme for LSCOLORS (BSD)
+    # a => black    A => dark gray
+    # b => red      B => bold red
+    # c => green    C => bold green
+    # d => brown    D => yellow
+    # e => blue     E => bold blue
+    # f => magenta  F => bold magenta
+    # g => cyan     G => bold cyan
+    # h => gray     H => white
+    # x => default
+
+    # Ordering for LSCOLORS(BSD)
+    # 1. directory
+    # 2. symbolic link
+    # 3. socket
+    # 4. pipe
+    # 5. executable
+    # 6. block device
+    # 7. character device
+    # 8. executable with setuid set
+    # 9. executable with setguid set
+    # 10. directory writable by others, with sticky bit
+    # 11. directory writable by others, without sticky bit
+    
+    export LSCOLORS="ExGxbxdxCxegedabagacad"
+
+    # Must use either CLICOLOR=1 or ls -G
+    export CLICOLOR=1
+fi
+
+DCFILE="$HOME/.dircolors"
+
+# We can presume we are on a GNU system, or at the very least,
+# a system which has the GNU coreutils installed
+if [[ -f $DCFILE ]] && [[ -s $DCFILE ]]
+then
+    if [[ ! -z `which dircolors` ]]
+    then
+        eval `dircolors $DCFILE`
+    elif [[ ! -z `which gdircolors` ]]
+    then
+        # OS X with coreutils installed from MacPorts will have
+        # dircolors installed by default as gdircolors.
+        eval `gdircolors $DCFILE`
+    fi
+fi
+