Add Format The Current File Within Vim as a reason til

README.md

@@ -10,7 +10,7 @@ smart people at [Hashrocket](http://hashrocket.com/).
 For a steady stream of TILs from a variety of rocketeers, checkout
 [til.hashrocket.com](https://til.hashrocket.com/).
 
-_702 TILs and counting..._
+_703 TILs and counting..._
 
 ---
 
@@ -510,6 +510,7 @@ _702 TILs and counting..._
 - [Defining Variants With Constructor Arguments](reason/defining-variants-with-constructor-arguments.md)
 - [Dynamically Create A Printf String Format](reason/dynamically-create-a-printf-string-format.md)
 - [Exhaustive Pattern Matching Of List Variants](reason/exhaustive-pattern-matching-of-list-variants.md)
+- [Format The Current File Within Vim](reason/format-the-current-file-within-vim.md)
 - [Generate Starter Reason Projects](reason/generate-starter-reason-projects.md)
 - [Helping The Compiler Help Us With Variants](reason/helping-the-compiler-help-us-with-variants.md)
 - [Inline Component Styles With Reason React](reason/inline-component-styles-with-reason-react.md)

reason/format-the-current-file-within-vim.md

@@ -0,0 +1,19 @@
+# Format The Current File Within Vim
+
+I'm editing a `.re` file within Vim. I haven't yet wired up `refmt` to
+something like [ALE](https://github.com/w0rp/ale) for automatic formatting
+on save. By the time I'm done with my changes, indentation is a mess.
+
+I can still take advantage of `refmt` to clean up my file.
+
+```
+:!refmt --in-place %
+```
+
+Running that command in Vim will cause the current file to be formatted.
+
+How does it work?
+
+It shells-out to `refmt` which does all the heavy lifting. The `--in-place`
+flag means that the target file will be re-written by the formatted result.
+The `%` is a handy Vim shorthand for the path and name of the current file.