Is your feature request related to a problem? Please describe.
I tried out pypi-changes in a project virtualenv and had to pass the explicit path to the python executable, when I expected that the program would just work in the context of my current virtualenv (like pipdeptree, pip and other tools).

Describe the solution you'd like
The program could have a useful default of looking for the path of the python executable using shutil.which when no parameter is given for the PYTHON_EXE parameter.

People are already used to typing only python or python3 to refer to the executable of the currently-activated virtualenv, or to refer to the system/global install when not in a virtualenv.

Describe alternatives you've considered
pypi-changes python would be a little nicer than pypi-changes $(which python).
Explicit in that I type the python executable name, convenient because I don’t need to do which if the program does it for me.

Additional context

Hi there,

this is a really nice tool to check, if your libs are outdated. What would be nice if one could output the information provided in a requirements.txt to be able to update to the newest versions. Or is there another tool or some functionality inside pip that I'm missing?

Cheers,
Sebastian

Is your feature request related to a problem? Please describe.
Currently when the remote version is newer than the installed one, it shows up in red, which is great, and we see that in the example below.

In this example, the pyparsing package has a new major update: 3.x, as opposed to a 2.x installed.

👉 The request is to have a different color (ex brighter red) if the major version is newer than the installed version.

I understand that this may not mean much in projects that follow a different versioning strategy, but would be helpful where major.minor.patch is used.

Just tried pypi-changes, looks super cool! However, I found something weird with mimeparse:

$ pypi-changes .venv/bin/python
🐍 Distributions within /home/juanlu/Projects/LSF/poliastro/library/.venv/bin/python                                                                                                                                                          
├── mimeparse 0.1.3 11 years ago remote 0.1.4 3 seconds from now                                                                                                                                                                              
├── cryptography 3.4.7 7 months ago remote 36.0.0 an hour ago                                                                                                                                                                                 
├── ujson 1.35 5 years ago remote 4.3.0 an hour ago                                                                                                                                                                                           
├── hypothesis 6.14.6 3 months ago remote 6.27.0 9 hours ago
...

Looks like a bug?

Is your feature request related to a problem? Please describe.

As a user who wants to automate things, I'd like to be able to process the data generated by pypi-changes.

Describe the solution you'd like

It would be nice to have an option to generate the output as JSON as a format that is easy generate and process.

Describe alternatives you've considered

• Even with 1.0.0, I can parse the output as text. Fortunately, it uses ANSI terminal colours only on a tty. It's just a bit more parsing work for me
• There is another feature request #1 to generate requirements.txt with updated packages, but it's only about one task the author wishes to automate. I consider the idea with the JSON outputs for a variety of tasks such as reminders about possibly unmaintained packages

Additional context

@gaborbernat Your tool is awesome! 🔥Thanks for publishing it! 🙏

It'd be nice if the output was sorted alphabetically. Sometimes you just want to check if package X is up to date. Its location will be indeterministic. If it was recently updated it'll be near top, but if it wasn't it's not easy to find.

Describe the solution you'd like
Add option to sort output alphabetically instead of by date.