better-ls.sh

#!/bin/sh

##	+-----------------------------------+-----------------------------------+
##	|                                                                       |
##	|                               BETTER LS                               |
##	|                                                                       |
##	| Copyright (c) 2018, Andres Gongora <mail@andresgongora.com>.          |
##	|                                                                       |
##	| This program is free software: you can redistribute it and/or modify  |
##	| it under the terms of the GNU General Public License as published by  |
##	| the Free Software Foundation, either version 3 of the License, or     |
##	| (at your option) any later version.                                   |
##	|                                                                       |
##	| This program is distributed in the hope that it will be useful,       |
##	| but WITHOUT ANY WARRANTY; without even the implied warranty of        |
##	| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         |
##	| GNU General Public License for more details.                          |
##	|                                                                       |
##	| You should have received a copy of the GNU General Public License     |
##	| along with this program. If not, see <http://www.gnu.org/licenses/>.  |
##	|                                                                       |
##	+-----------------------------------------------------------------------+


##
##	BETTER LS (overrides 'ls' command, uses /usr/bin/ls)
##
##	Modifications:
##	- Colorized
##	- Human readable output
##	- Long timestamp
##
##	If no arguments passed
##		Show . and ..
##		Shows directories
##		Shows visible files
##		Shows hidden directories
##		Shows hidden files
##	else
##		Runs with argument and sorts directories first
##


##	NOTES
##	=====
##
## 	shopt -s extglob 
##		This must be enabled for extglob wildcards to work (eg !).
##
## 	files=$(/usr/bin/ls -U * 2> /dev/null | wc -l)
##		Create a list of all files in '*' and count it with wc -l
##		If zero there is no file. -U disables sorting for
##		shorter response times.
##
##	hidden_files=$(/usr/bin/ls -U -d .!(|.) 2> /dev/null | wc -l)
##		Same as above, but for '.!(|.)', which includes all
##		hidden files but ommits '.' and '..' .
##
##	.!(|.)
##		Anything starting with '.' and not followed by '|.',
##		meaning either nothing or another '.' .
##


shopt -s extglob


## IF NO ARGUMENTS PASSED -> run better ls version on current folder
if [ $# -eq 0 ]		# If no arguments passed
then

	## IF THE CURRENT FOLDER IS NOT EMPTY -> Display all
	files=$(/usr/bin/ls -U * 2> /dev/null | wc -l)	
	if [ "$files" != "0" ]
	then 
		## List implied . and .., visible folders, then visible files
		/usr/bin/ls -d {.,..,*} -lA --color=auto --human-readable \
			--time-style=long-iso --group-directories-first;


		## List hidden folders and files (only if they exist)
		hidden_files=$(/usr/bin/ls -U -d .!(|.) 2> /dev/null | wc -l)	
		if [ "$hidden_files" != "0" ]
		then
			echo ""
			/usr/bin/ls -d .!(|.) -l --color=auto --hide='..' \
				--human-readable --time-style=long-iso \
				--group-directories-first;
		fi

	## IF THE CURRENT FOLDER IS EMPTY -> List . and ..
	else
		/usr/bin/ls -d {.,..,} -lA --color=auto --human-readable \
			--time-style=long-iso --group-directories-first;
	fi


## IF ARGUMENTS PASSED -> run standard ls but with some tweaks (eg: colors)		
else
	/usr/bin/ls -la --color=auto --human-readable --time-style=long-iso \
		--group-directories-first "$@";	
fi



### EOF ###