CLI export option

[BotiKepi]

Hi,
I'm not an every day user of QElectrotech, but I do appreciate it (thanks for that !).
Yet, I'm used to version control my files (with git), even files such as .qet .

Having the ability to export pdf (or such graphic output) through CLI let the ability to graphically enlight differences when making a git diff, before committing for instance (the what-have-I-done-since-last-commit syndrom ;-) ).
This can be done using git attributes, which let us automate the process : exporting 2 versions of graphic rendering -- pdf, png, svg ...-- and diffing the graphics (in various ways).

I use that process with KiCad (PCB design) : it's not perfect, but quite convenient.

Hence, having a CLI export option (like for instance, --export-pdf) would be appreciated .

This is somewhat related to #162 , yet the need here is smaller : no need for a scripting language, "just" restricted actions such as export, through options (and without launching GUI).

Yeah, sorry for the "just" word, I don't know how big effort this would take, but I guess this is not a small piece of cake.

[pkess]

I agree with @BotiKepi . It would be very nice to have the possibility to export project contents like the full schematic as pdf. Another nice thing would be to export all connections as a list.