Add Format Specific html.erb Template Files as a Rails TIL

rails/format-specific-html-erb-template-files.md

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+# Format Specific html.erb Template Files
+
+There are a few tools out there that can do formatting of `*.html.erb` template
+files. One that I like is
+[nebulab/erb-formatter](https://github.com/nebulab/erb-formatter#readme)
+because it is ready to use in many different editors. That means that it is
+easier to adopt on a team of developers with different editor preferences.
+
+That said, there are projects where I don't necessarily want it wired up to run
+on save because the formatting changesets will be too agressive. Instead, I
+want to run it manually on specific files as I see fit.
+
+To do this, I install the formatter tool:
+
+```bash
+$ gem install erb-formatter
+```
+
+And now it is available as a CLI tool (try `which erb-format`).
+
+As their docs recommend, I can run it against all files like so:
+
+```
+$ erb-format app/views/**/*.html.erb --write
+```
+
+If that is too aggressive though, I find it useful to either run against a
+specific file:
+
+```
+$ erb-format app/views/some/model/index.html.erb --write
+```
+
+Or when I'm wrapping up changes on a branch, I like to run it against all the
+view files that were touched on this branch:
+
+```
+$ git diff --name-only master...HEAD -- app/views | xargs erb-format --write
+```