1 files changed, 195 insertions, 0 deletions
diff --git a/vendor/github.com/mattn/go-shellwords/shellwords.go b/vendor/github.com/mattn/go-shellwords/shellwords.go
new file mode 100644
index 000000000..41429d8f2
--- /dev/null
+++ b/vendor/github.com/mattn/go-shellwords/shellwords.go
@@ -0,0 +1,195 @@
+package shellwords
+
+import (
+	"errors"
+	"os"
+	"regexp"
+	"strings"
+)
+
+var (
+	ParseEnv      bool = false
+	ParseBacktick bool = false
+)
+
+var envRe = regexp.MustCompile(`\$({[a-zA-Z0-9_]+}|[a-zA-Z0-9_]+)`)
+
+func isSpace(r rune) bool {
+	switch r {
+	case ' ', '\t', '\r', '\n':
+		return true
+	}
+	return false
+}
+
+func replaceEnv(getenv func(string) string, s string) string {
+	if getenv == nil {
+		getenv = os.Getenv
+	}
+
+	return envRe.ReplaceAllStringFunc(s, func(s string) string {
+		s = s[1:]
+		if s[0] == '{' {
+			s = s[1 : len(s)-1]
+		}
+		return getenv(s)
+	})
+}
+
+type Parser struct {
+	ParseEnv      bool
+	ParseBacktick bool
+	Position      int
+
+	// If ParseEnv is true, use this for getenv.
+	// If nil, use os.Getenv.
+	Getenv func(string) string
+}
+
+func NewParser() *Parser {
+	return &Parser{
+		ParseEnv:      ParseEnv,
+		ParseBacktick: ParseBacktick,
+		Position:      0,
+	}
+}
+
+func (p *Parser) Parse(line string) ([]string, error) {
+	args := []string{}
+	buf := ""
+	var escaped, doubleQuoted, singleQuoted, backQuote, dollarQuote bool
+	backtick := ""
+
+	pos := -1
+	got := false
+
+loop:
+	for i, r := range line {
+		if escaped {
+			buf += string(r)
+			escaped = false
+			continue
+		}
+
+		if r == '\\' {
+			if singleQuoted {
+				buf += string(r)
+			} else {
+				escaped = true
+			}
+			continue
+		}
+
+		if isSpace(r) {
+			if singleQuoted || doubleQuoted || backQuote || dollarQuote {
+				buf += string(r)
+				backtick += string(r)
+			} else if got {
+				if p.ParseEnv {
+					buf = replaceEnv(p.Getenv, buf)
+				}
+				args = append(args, buf)
+				buf = ""
+				got = false
+			}
+			continue
+		}
+
+		switch r {
+		case '`':
+			if !singleQuoted && !doubleQuoted && !dollarQuote {
+				if p.ParseBacktick {
+					if backQuote {
+						out, err := shellRun(backtick)
+						if err != nil {
+							return nil, err
+						}
+						buf = out
+					}
+					backtick = ""
+					backQuote = !backQuote
+					continue
+				}
+				backtick = ""
+				backQuote = !backQuote
+			}
+		case ')':
+			if !singleQuoted && !doubleQuoted && !backQuote {
+				if p.ParseBacktick {
+					if dollarQuote {
+						out, err := shellRun(backtick)
+						if err != nil {
+							return nil, err
+						}
+						if r == ')' {
+							buf = buf[:len(buf)-len(backtick)-2] + out
+						} else {
+							buf = buf[:len(buf)-len(backtick)-1] + out
+						}
+					}
+					backtick = ""
+					dollarQuote = !dollarQuote
+					continue
+				}
+				backtick = ""
+				dollarQuote = !dollarQuote
+			}
+		case '(':
+			if !singleQuoted && !doubleQuoted && !backQuote {
+				if !dollarQuote && strings.HasSuffix(buf, "$") {
+					dollarQuote = true
+					buf += "("
+					continue
+				} else {
+					return nil, errors.New("invalid command line string")
+				}
+			}
+		case '"':
+			if !singleQuoted && !dollarQuote {
+				doubleQuoted = !doubleQuoted
+				continue
+			}
+		case '\'':
+			if !doubleQuoted && !dollarQuote {
+				singleQuoted = !singleQuoted
+				continue
+			}
+		case ';', '&', '|', '<', '>':
+			if !(escaped || singleQuoted || doubleQuoted || backQuote) {
+				if r == '>' && len(buf) > 0 {
+					if c := buf[0]; '0' <= c && c <= '9' {
+						i -= 1
+						got = false
+					}
+				}
+				pos = i
+				break loop
+			}
+		}
+
+		got = true
+		buf += string(r)
+		if backQuote || dollarQuote {
+			backtick += string(r)
+		}
+	}
+
+	if got {
+		if p.ParseEnv {
+			buf = replaceEnv(p.Getenv, buf)
+		}
+		args = append(args, buf)
+	}
+
+	if escaped || singleQuoted || doubleQuoted || backQuote || dollarQuote {
+		return nil, errors.New("invalid command line string")
+	}
+
+	p.Position = pos
+
+	return args, nil
+}
+
+func Parse(line string) ([]string, error) {
+	return NewParser().Parse(line)
+}