Update vendor/

vendor/mvdan.cc/sh/shell/expand.go

@@ -0,0 +1,63 @@
+// Copyright (c) 2018, Daniel Martí <mvdan@mvdan.cc>
+// See LICENSE for licensing information
+
+package shell
+
+import (
+	"os"
+	"strings"
+
+	"mvdan.cc/sh/expand"
+	"mvdan.cc/sh/syntax"
+)
+
+// Expand performs shell expansion on s as if it were within double quotes,
+// using env to resolve variables. This includes parameter expansion, arithmetic
+// expansion, and quote removal.
+//
+// If env is nil, the current environment variables are used. Empty variables
+// are treated as unset; to support variables which are set but empty, use the
+// expand package directly.
+//
+// Command subsitutions like $(echo foo) aren't supported to avoid running
+// arbitrary code. To support those, use an interpreter with the expand package.
+//
+// An error will be reported if the input string had invalid syntax.
+func Expand(s string, env func(string) string) (string, error) {
+	p := syntax.NewParser()
+	word, err := p.Document(strings.NewReader(s))
+	if err != nil {
+		return "", err
+	}
+	if env == nil {
+		env = os.Getenv
+	}
+	cfg := &expand.Config{Env: expand.FuncEnviron(env)}
+	return expand.Document(cfg, word)
+}
+
+// Fields performs shell expansion on s as if it were a command's arguments,
+// using env to resolve variables. It is similar to Expand, but includes brace
+// expansion, tilde expansion, and globbing.
+//
+// If env is nil, the current environment variables are used. Empty variables
+// are treated as unset; to support variables which are set but empty, use the
+// expand package directly.
+//
+// An error will be reported if the input string had invalid syntax.
+func Fields(s string, env func(string) string) ([]string, error) {
+	p := syntax.NewParser()
+	var words []*syntax.Word
+	err := p.Words(strings.NewReader(s), func(w *syntax.Word) bool {
+		words = append(words, w)
+		return true
+	})
+	if err != nil {
+		return nil, err
+	}
+	if env == nil {
+		env = os.Getenv
+	}
+	cfg := &expand.Config{Env: expand.FuncEnviron(env)}
+	return expand.Fields(cfg, words...)
+}