* Make empty string check more consistent
Replace explicit empty string check condition with inbuilt POSIX compliant empty string check flag, in adherence with the rest of the script.
* Update test expression
* additionally extract from xml files
Before this, rssadd only accepted a URL as argument. Now, if given
an xml file, it will parse it and extract the proper url. This lets it
be used in conjunction with firefox for quickly adding RSS feeds (as
firefox would give it the file rather than its origin URL). This works
on a majority of RSS feeds, but fails on some that miss the proper link
tags. The original behaviour is still mantained alongside the new.
* remove surplus `exit`
* more performant grepping
* Handle color control sequences
Is: `less` outputs the raw ascii of the $chartfile, which includes escape characters to change output colors. This does not resemble a graph.
Should be: Adding -n flag to have `less` create colored output properly.
* typo
changed to -Srf to reflect proposed change
Tested it on a project with this structure:
```
- root
|- test
| - Test.java
```
The user must call `compiler` from the root of the project, but that should not
be an inconvenience because usually the working directory is the project's
root. Nonetheless, it also works for java files in the current working directory,
in case someone just wants to test some code quickly.
* Compatibility for FreeBSD's paste(1)
According to FreeBSD's
[paste(1)](https://www.freebsd.org/cgi/man.cgi?query=paste&sektion=1&manpath=FreeBSD+12.2-RELEASE+and+Ports),
the extra `-` is needed (tested by myself).
This obviously works for Linux as well, tested on Void Linux at least.
> Create a colon-separated list of directories named bin,
> suitable for use in the PATH environment variable:
`find / -name bin -type d | paste -s -d : -`
* Compatibility for FreeBSD's paste(1)
According to FreeBSD's
[paste(1)](https://www.freebsd.org/cgi/man.cgi?query=paste&sektion=1&manpath=FreeBSD+12.2-RELEASE+and+Ports),
the extra `-` is needed (tested by myself).
This obviously works for Linux as well, tested on Void Linux at least.
> Create a colon-separated list of directories named bin,
> suitable for use in the PATH environment variable:
`find / -name bin -type d | paste -s -d : -`
