Update CI dependencies (#12)

* Update CI dependencies

* Fix error style

.github/workflows/go.yml

@@ -1,25 +1,48 @@
 name: build
-on: [push, pull_request]
-jobs:
+on:
+  push:
+    branches:
+      - main
+  pull_request:
 
+jobs:
   test-build:
     name: Test & Build
     runs-on: ubuntu-latest
     steps:
 
-    - name: Set up Go 1.13
-      uses: actions/setup-go@v1
+    - name: Set up Go 
+      uses: actions/setup-go@v3
       with:
-        go-version: 1.13
-      id: go
+        go-version: '>=1.20.0'
 
     - name: Check out code into the Go module directory
-      uses: actions/checkout@v1
+      uses: actions/checkout@v3
+
+    - name: Run go mod tidy
+      run: |
+        set -e
+        go mod tidy
+        output=$(git status -s)
+        if [ -z "${output}" ]; then
+         exit 0
+        fi
+        echo 'We wish to maintain a tidy state for go mod. Please run `go mod tidy` on your branch, commit and push again.'
+        echo 'Running `go mod tidy` on this CI test yields with the following changes:'
+        echo "$output"
+        exit 1
       
     - name: Test
-      run: |
-        go mod tidy -v
-        go test -race ./...
+      run: go test -race ./...
+
+    - name: Lint
+      run: "go vet ./..."
+
+    - name: Staticcheck
+      uses: dominikh/staticcheck-action@v1.2.0
+      with:
+        version: "2023.1.1"
+        install-go: false
 
     - name: Build
       run: go build ./...

go.mod

@@ -1,3 +1,3 @@
 module github.com/fatih/motion
 
-go 1.12
+go 1.20

main.go

@@ -14,7 +14,7 @@ import (
 
 func main() {
 	if err := realMain(); err != nil {
-		fmt.Fprint(os.Stderr, err.Error())
+		fmt.Fprintf(os.Stderr, "%s\n", err.Error())
 		os.Exit(1)
 	}
 }
@@ -83,17 +83,17 @@ func realMain() error {
 	case "json":
 		b, err := json.MarshalIndent(&res, "", "\t")
 		if err != nil {
-			return fmt.Errorf("JSON error: %s\n", err)
+			return fmt.Errorf("JSON error: %s", err)
 		}
 		os.Stdout.Write(b)
 	case "vim":
 		b, err := vim.Marshal(&res)
 		if err != nil {
-			return fmt.Errorf("VIM error: %s\n", err)
+			return fmt.Errorf("VIM error: %s", err)
 		}
 		os.Stdout.Write(b)
 	default:
-		return fmt.Errorf("wrong -format value: %q.\n", *flagFormat)
+		return fmt.Errorf("wrong -format value: %q", *flagFormat)
 	}
 
 	return nil