My soft-wrap-indicator package solves the indication problem of whether a file has Soft Wrap turned on and also makes it easy to toggle by clicking the indicator in the status bar.
As far as “per-file” basis, if you want certain file types to be soft-wrapped by default then you can go into the settings for that package and check “Soft Wrap”. Here’s how I did that for Markdown files:
- Launch Atom
- Open the Settings View using Cmd+, on OS X or Ctrl+, on other platforms
- Click the Packages tab
- Search for
- Click the Settings button on the
- Scroll down to and check “Soft Wrap”
By default, all Markdown files will be soft wrapped after that.