"file is not gofmted" in go report card - go

Question

I have a Go project, where I wanted to generate a Go report card (https://goreportcard.com/)
One of the things that this report card is that it runs
gofmt -s
On all files.
My repo contains around 25 Go files, the only flag that is raised is this one, on six files:
Line 1: warning: file is not gofmted with -s (gofmt)
I've been googling around on gofmt, but I really can't find what this actually means.
Here is an example of a file that raises the error:
package services
import (
"github.com/heyjoakim/devops-21/models"
log "github.com/sirupsen/logrus"
)
var d = GetDBInstance()
// GetUserID returns user ID for username
func GetUserID(username string) (uint, error) {
var user models.User
getUserIDErr := d.db.First(&user, "username = ?", username).Error
if getUserIDErr != nil {
log.WithFields(log.Fields{
"err": getUserIDErr,
"username": username,
}).Error("Error in GetUserID")
}
return user.UserID, getUserIDErr
}
and here is a file that does not raise the error:
package services
import (
"strconv"
"github.com/heyjoakim/devops-21/models"
log "github.com/sirupsen/logrus"
)
func UpdateLatest(latest int) {
var c models.Config
err := d.db.First(&c, "key = ?", "latest").Error
if err != nil {
log.WithField("err", err).Error("Latest does not exist: DB err")
c.ID = 0
c.Key = "latest"
c.Value = strconv.Itoa(latest)
d.db.Create(&c)
} else {
err := d.db.Model(&models.Config{}).Where("key = ?", "latest").Update("Value", latest).Error
if err != nil {
log.WithField("err", err).Error("UpdateLatest: DB err")
}
}
}
I really don't see why one raises some error on line 1, and the other doesn't?
What does this flag mean?

Answer 1

The command gofmt -s myfile.go prints the formatted file to stdout. The -s flag applies simplifications to the formatted file.
Run gofmt -s -d myfile.go to view the differences between the original file and the formatted file.
Run gofmt -s -w myfile.go to update the file to the desired formatting.
Replace myfile.go with . to operate on all files in the directory.
The documentation for the gofmt command is here.
Your files are not formatted. Run gofmt -s -w . in the directory to fix the files.