#!/bin/bash
 
 usage() {
	 description | fmt -s >&2
 }
  
description() {
	cat << HERE
	
	DESCRIPTION
	Upload data and fetch URL from the pastebin http://sprunge.us
      
	USAGE
        $0 filename.txt
	$0 text string
	$0 < filename.txt
	piped_data | $0
       
	NOTES
	--------------------------------------------------------------------------
	* INPUT METHODS *
	$0 can accept piped data, STDIN redirection [<filename.txt], text strings following the command as arguments, or filenames as arguments.  Only one of these methods can be used at a time, so please see the note on precedence.  Also, note that using a pipe or STDIN redirection will treat tabs as spaces, or disregard them entirely (if they appear at the beginning of a line).  So I suggest using a filename as an argument if tabs are important either to the function or readability of the code.
		        
	* PRECEDENCE *
	STDIN redirection has precedence, then piped input, then a filename as an argument, and finally text strings as an arguments.
		 
	EXAMPLE:
	echo piped | "$0" arguments.txt < stdin_redirection.txt
			      
	In this example, the contents of file_as_stdin_redirection.txt would be uploaded. Both the piped_text and the file_as_argument.txt are ignored. If there is piped input and arguments, the arguments will be ignored, and the piped input uploaded.
			       
	* FILENAMES *
	If a filename is misspelled or doesn't have the necessary path description, it will NOT generate an error, but will instead treat it as a text string and upload it.
	--------------------------------------------------------------------------
			        
	HERE
	exit
  }
   
	if [ -t 0 ]; then
		echo Running interactively, checking for arguments... >&2
		if [ "$*" ]; then
			echo Arguments present... >&2
			if [ -f "$*" ]; then
				echo Uploading the contents of "$*"... >&2
				cat "$*"
			else
				echo Uploading the text: \""$*"\"... >&2
				echo "$*"
			fi | curl -F 'sprunge=<-' http://sprunge.us
		else
			echo No arguments found, printing USAGE and exiting. >&2
			usage
		fi
	else
		echo Using input from a pipe or STDIN redirection... >&2
		while read -r line ; do
			echo $line
		done | curl -F 'sprunge=<-' http://sprunge.us
	fi