1 files changed, 74 insertions, 0 deletions
diff --git a/vendor/github.com/mgechev/revive/rule/blank-imports.go b/vendor/github.com/mgechev/revive/rule/blank-imports.go
new file mode 100644
index 0000000000..0a00e3707d
--- /dev/null
+++ b/vendor/github.com/mgechev/revive/rule/blank-imports.go
@@ -0,0 +1,74 @@
+package rule
+
+import (
+	"go/ast"
+
+	"github.com/mgechev/revive/lint"
+)
+
+// BlankImportsRule lints given else constructs.
+type BlankImportsRule struct{}
+
+// Apply applies the rule to given file.
+func (r *BlankImportsRule) Apply(file *lint.File, _ lint.Arguments) []lint.Failure {
+	var failures []lint.Failure
+
+	fileAst := file.AST
+	walker := lintBlankImports{
+		file:    file,
+		fileAst: fileAst,
+		onFailure: func(failure lint.Failure) {
+			failures = append(failures, failure)
+		},
+	}
+
+	ast.Walk(walker, fileAst)
+
+	return failures
+}
+
+// Name returns the rule name.
+func (r *BlankImportsRule) Name() string {
+	return "blank-imports"
+}
+
+type lintBlankImports struct {
+	fileAst   *ast.File
+	file      *lint.File
+	onFailure func(lint.Failure)
+}
+
+func (w lintBlankImports) Visit(_ ast.Node) ast.Visitor {
+	// In package main and in tests, we don't complain about blank imports.
+	if w.file.Pkg.IsMain() || w.file.IsTest() {
+		return nil
+	}
+
+	// The first element of each contiguous group of blank imports should have
+	// an explanatory comment of some kind.
+	for i, imp := range w.fileAst.Imports {
+		pos := w.file.ToPosition(imp.Pos())
+
+		if !isBlank(imp.Name) {
+			continue // Ignore non-blank imports.
+		}
+		if i > 0 {
+			prev := w.fileAst.Imports[i-1]
+			prevPos := w.file.ToPosition(prev.Pos())
+			if isBlank(prev.Name) && prevPos.Line+1 == pos.Line {
+				continue // A subsequent blank in a group.
+			}
+		}
+
+		// This is the first blank import of a group.
+		if imp.Doc == nil && imp.Comment == nil {
+			w.onFailure(lint.Failure{
+				Node:       imp,
+				Failure:    "a blank import should be only in a main or test package, or have a comment justifying it",
+				Confidence: 1,
+				Category:   "imports",
+			})
+		}
+	}
+	return nil
+}