`swag fmt` fails to format annotations correctly unless there’s a blank line before the function

[redish101]

Describe the bug When running swag fmt, annotations in the comment block are not indented as expected. The formatter only works correctly if there is an extra blank line after the last annotation.

To Reproduce

1. Create a Go file with the following content (no blank line after annotations):

   // @title retalk
   // @version 1.0.0
   // @license.name	GPL 3.0
   // @license.url https://www.gnu.org/licenses/gpl-3.0.en.html
   // @securityDefinitions.apikey apiKeyAuth
   // @in header
   // @name Authorization
   func Start() {
       // ...
   }
   

2. Run:

   swag fmt
   

3. Observe that the formatter produces incorrect output

4. Add a blank line after the last annotation:

   // @name						Authorization
   
   func Start() {
       // ...
   }
   

5. Run swag fmt again and notice that formatting is now correct.

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Expected behavior swag fmt should correctly format the annotation block and leave the function signature on its own line without requiring an extra blank line.

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Your swag version v1.16.4

Your go version go version go1.24.4 linux/amd64

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Desktop (please complete the following information):

• OS: macOS and Linux
• Terminal/Shell: bash

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Additional context This issue only appears when there is no blank line between the last // @… annotation and the func.

[sdghchj]

If there is no blank line, it's docs of the below function, otherwise it's global comments. And the docs would be fmt again by the IDE or gofmt, I guess. A normal examle of function docs may be like:

// Start
//
//   @xxxx  yyyy
func Start(){
}

[redish101]

I got the same error result by simply executing swag fmt through the terminal without opening any IDE. Copyright © Redish101. All rights reserved.

[sdghchj]

I mean swag fmt calls go fmt at end.

https://github.com/swaggo/swag/blob/master/formatter.go#L73

[thommeo]

It also adds the tabs where there should be none

[buiducnhat]

+1, My code even not format by swag with the line break

[lutfiandri]

Same problem, using swaggo v2.0.0

[bernardinorafael]

still with error here...

[ubogdan]

This is an OOS project. any contribution is wellcome. Let me know if i can assis with a PR