Add command-line "Go-To-Line" option

[colinkiama]

Fixes #415

[jeremypw]

@colinkiama Just a hint - for a substantial PR, if it is ready for review then its best to request a review either from a specific person or from the elementary/desktop-developers team (if you are able to do that).

[jeremypw]

Just had a quick try of this - the commandline handling seems to work but the actual selecting and displaying the specified range does not seem to work yet? Maybe convert to draft if you are still working on this.

[colinkiama]

@colinkiama Just a hint - for a substantial PR, if it is ready for review then its best to request a review either from a specific person or from the elementary/desktop-developers team (if you are able to do that).

I don't have the option to request a reviewer on this PR sadly:

[colinkiama]

Just had a quick try of this - the command line handling seems to work but the actual selecting and displaying the specified range does not seem to work yet? Maybe convert to draft if you are still working on this.

I'm sure that I completed this. Do you mind sharing what you wrote in the terminal to try out this feature?

EDIT
For example this selected all lines between line 12 and 20 for me:

io.elementary.code -g 12-20 /home/colinkiama/Projects/files/meson.build 

[jeremypw]

@colinkiama Just a hint - for a substantial PR, if it is ready for review then its best to request a review either from a specific person or from the elementary/desktop-developers team (if you are able to do that).

I don't have the option to request a reviewer on this PR sadly

Ah, I guess you have to be given that permission by @danirabbit . If you contribute regularly (which you seem to be doing) then that should not be a problem 😄

[jeremypw]

Just had a quick try of this - the command line handling seems to work but the actual selecting and displaying the specified range does not seem to work yet? Maybe convert to draft if you are still working on this.

I'm sure that I completed this. Do you mind sharing what you wrote in the terminal to try out this feature?

Strange - just tried it again and it worked this time. Not sure what happened before - I'll do some more testing and review the coding.

[jeremypw]

Just a couple of elementaryos code-style suggestions and one suggestion to avoid unnecessary multiple function returns. Should be ready then.

[jeremypw]

Good to go now, thanks for your work!