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Configure vimrc based on environment variables

Is it possible to configure vimrc command mapping based on env variables?

For example, I'm using vim-ruby-test plugin which provides the following config:

let g:rubytest_cmd_test = "ruby %p"

I want to set the command differently based on whether i'm running tests using spork or not:

With Spork:

$ TESTDRB=y mvim .
let g:rubytest_cmd_test = "testdrb %p"

Without Spork:

$ mvim .
let g:rubytest_cmd_test = "ruby %p"
Solution 
  • if $TESTDRB == 'y'
    let g:rubytest_cmd_test = 'ruby %p'
endif
" etc