fallback.rb not overwritten when executing ruby extconf.rb

[julijavin]

I was having issues running command-t, with errors indicating incompatible ruby versions between vim and ruby even though I only have one version of ruby installed. I noticed that the ~/.vim/bundle/command-t/ruby/command-t/lib/command-t/metadata/fallback.rb file contained:
EXPECTED_RUBY_VERSION = '[unknown]'
EXPECTED_RUBY_PATCHLEVEL = '[unknown]'
UNKNOWN = true
even after running ruby extconf.rb.

Looked to me like it was not getting overwritten, so I used ruby -v to get the version number and edited the file myself:
EXPECTED_RUBY_VERSION = "2.7.0"
EXPECTED_RUBY_PATCHLEVEL = 0
UNKNOWN = false
After this, I ran make and and, in vim, :PluginUpdate. This fixed the issue, and I was able to use command-t.
Note, I reran ruby extconf.rb after manually editing the file and the variables were not changed back to unkown, which is why I think the file may just not be getting written.

I am creating the issue in case others run into a similar ruby version problem. Not sure if this is something with the command-t code or just something weird in my system/setup.

My system setup:
OS: Ubuntu 20.04 LTS
vim: Vi IMproved 8.2, included patches: 1-1216
ruby: 2.7.0p0

[wincent]

Given the big rewrite for v6.0.x, I'm closing all older issues as there is unlikely to be anything significant happening on the 5-x-devel branch from here on¹. Feedback issue for 6.0.x is here:

• 🆕 Command-T 6.0.0 release — compendium issue #393

Footnotes

1. Patches and PRs would be welcome, but my personal efforts are going to be directed towards main. ↩