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Add Search For Gem Versions Available To Install as a Ruby TIL

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2023-10-11 08:53:51 -05:00
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README.md
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For a steady stream of TILs, [sign up for my newsletter](https://crafty-builder-6996.ck.page/e169c61186).
_1341 TILs and counting..._
_1342 TILs and counting..._
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- [Safe Navigation Operator](ruby/safe-navigation-operator.md)
- [Scripting With RVM](ruby/scripting-with-rvm.md)
- [Scroll To Top Of Page With Capybara](ruby/scroll-to-top-of-page-with-capybara.md)
- [Search For Gem Versions Available To Install](ruby/search-for-gem-versions-available-to-install.md)
- [Set RVM Default Ruby](ruby/set-rvm-default-ruby.md)
- [Shift The Month On A Date Object](ruby/shift-the-month-on-a-date-object.md)
- [Show Public Methods With Pry](ruby/show-public-methods-with-pry.md)

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ruby/search-for-gem-versions-available-to-install.md Normal file
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# Search For Gem Versions Available To Install
The [`gem list`](https://guides.rubygems.org/command-reference/#gem-list)
command combined with a few flags will produce a listing of all available
versions of that gem like so:
```bash
gem list rails --exact --remote --all
*** REMOTE GEMS ***
rails (7.1.0, 7.0.8, 7.0.7.2, 7.0.7.1, 7.0.7, ...)
```
I can then apply a bit of command-line transformation with `sed` and `tr` to
turn that list of version numbers into a list that can be nicely consumed by
other commands. In particular, I will pipe that list to `fzf` so that I can
fuzzy-search through the huge list for specific version matches.
```bash
$ gem list rails --exact --remote --all \
| sed -n 's/.*(\([^)]*\)).*/\1/p' \
| tr ',' '\n' \
| sed 's/^ //' \
| fzf
```
The first `sed` command captures everything inside the parentheses. The `tr`
command replaces the commas with new lines. And the second `sed` command
removes those leading space on each line.
Lastly, [`fzf`](https://github.com/junegunn/fzf) provides a fuzzy-search
interface over the list of versions.