formatter(compact): print hcl.Diagnostics errors in compact format

formatter/compact.go

@@ -1,8 +1,10 @@
 package formatter
 
 import (
+	"errors"
 	"fmt"
 
+	hcl "github.com/hashicorp/hcl/v2"
 	"github.com/terraform-linters/tflint/tflint"
 )
 
@@ -25,6 +27,24 @@ func (f *Formatter) compactPrint(issues tflint.Issues, appErr error, sources map
 	}
 
 	if appErr != nil {
+		var diags hcl.Diagnostics
+		if errors.As(appErr, &diags) {
+			for _, diag := range diags {
+				fmt.Fprintf(
+					f.Stdout,
+					"%s:%d:%d: %s - %s. %s\n",
+					diag.Subject.Filename,
+					diag.Subject.Start.Line,
+					diag.Subject.Start.Column,
+					fromHclSeverity(diag.Severity),
+					diag.Summary,
+					diag.Detail,
+				)
+			}
+
+			return
+		}
+
 		f.prettyPrintErrors(appErr, sources)
 	}
 }

formatter/compact_test.go

@@ -2,9 +2,11 @@ package formatter
 
 import (
 	"bytes"
+	"errors"
 	"testing"
 
 	hcl "github.com/hashicorp/hcl/v2"
+	"github.com/hashicorp/hcl/v2/hclparse"
 	"github.com/terraform-linters/tflint/tflint"
 )
 
@@ -14,6 +16,7 @@ func Test_compactPrint(t *testing.T) {
 		Issues tflint.Issues
 		Error  error
 		Stdout string
+		Stderr string
 	}{
 		{
 			Name:   "no issues",
@@ -38,6 +41,16 @@ func Test_compactPrint(t *testing.T) {
 test.tf:1:1: Error - test (test_rule)
 `,
 		},
+		{
+			Name:   "error",
+			Error:  errors.New("an error occurred"),
+			Stderr: "an error occurred\n",
+		},
+		{
+			Name:   "diagnostics",
+			Error:  hclDiags(`resource "foo" "bar" {`),
+			Stdout: "main.tf:1:22: error - Unclosed configuration block. There is no closing brace for this block before the end of the file. This may be caused by incorrect brace nesting elsewhere in this file.\n",
+		},
 	}
 
 	for _, tc := range cases {
@@ -48,7 +61,17 @@ test.tf:1:1: Error - test (test_rule)
 		formatter.compactPrint(tc.Issues, tc.Error, map[string][]byte{})
 
 		if stdout.String() != tc.Stdout {
-			t.Fatalf("Failed %s test: expected=%s, stdout=%s", tc.Name, tc.Stdout, stdout.String())
+			t.Errorf("Failed %s test: expected=%s, stdout=%s", tc.Name, tc.Stdout, stdout.String())
+		}
+
+		if stderr.String() != tc.Stderr {
+			t.Errorf("Failed %s test: expected=%s, stderr=%s", tc.Name, tc.Stderr, stderr.String())
 		}
 	}
 }
+
+func hclDiags(src string) hcl.Diagnostics {
+	parser := hclparse.NewParser()
+	_, diags := parser.ParseHCL([]byte(src), "main.tf")
+	return diags
+}