Try this to help troubleshoot the issue:
Check the location where you have downloaded the color proton.vim file.
On Linux, the system default will be something like /usr/share/vim/vim74/colors/
On MSWindows, the system default will be something like C:\Program Files (x86)\Vim\vim74\colors\
You could also try setting up a home directory for colors: $HOME/.vim/colors
on Linux, or $HOME/vimfiles/colors
on MSWindows.
See if the color scheme shows up outside of your ~/.vimrc
Restart vim, then per this StackOverflow post, type
:colorscheme
then Space followed by CTRLd
This should list your colorscheme along with all other color schemes.
Note: CTRLd returns one list which shows all color schemes.
If you use :colorscheme
then Space followed by TAB you will iterate over the list of color schemes, one at a time, each time you press TAB
You can also see this behaviour if you use :colorscheme
then Space followed by CTRLi ; you will iterate over the list of color schemes, one at a time, each time you press CTRLi
When I troubleshoot an issue like this, I prefer CTRLd so I may see the entire list at once.
type
:let colors_name
to return the name of the current colorscheme in use by vim
If you've added it to ~/.vimrc
to confirm which .vimrc file is being loaded by vim, type
:scriptnames
This will show you the path to the .vimrc
,
the path to the current colorscheme loaded,
and all scripts sourced so far.
This file will be ~\_vimrc
on MSWindows.
proton
is a colorscheme for the gui version of Vim, you could try creating a.gvimrc
file, and write the linecolorscheme proton
at the end of it.