Add bash aliases to force ls colored output

This is useful when piping the output of `ls` into `less` or another
pager. However, I added new aliases because making the default ones
force color would cause problems when piping into other commands or
directly to files, since the terminal escape characters would then
clobber the data.

dotfiles/.bashrc

@@ -81,16 +81,25 @@ EOF
 }
 
 bashrc_customize_aliases() {
-    # Group directories first if supported by the available `ls` command.
+    # Make `ls` group directories first if supported.
-    local ls_dir_group=""
     if ls --group-directories-first >/dev/null 2>&1; then
-        ls_dir_group="--group-directories-first"
+        alias ls="ls -hF --group-directories-first --color=auto"    # GNU
+    else
+        alias ls="ls -hF -G"                                        # BSD
+    fi
+
+    # Force `ls` to use color output (e.g. for piping into `less`).
+    if ls --color=auto >/dev/null 2>&1; then
+        alias lsc="ls --color=always"                               # GNU
+    else
+        alias lsc="/usr/bin/env CLICOLOR_FORCE=1 ls"                # BSD
     fi
 
-    alias ls="ls -hF --color=auto ${ls_dir_group}"
     alias la="ls -a"
     alias ll="ls -l"
+    alias llc="lsc -l"
     alias lla="ls -la"
+    alias llac="lsc -la"
     alias grep="grep --color=auto";
     alias egrep="egrep --color=auto";
     alias fgrep="fgrep --color=auto";