Test against go 1.19 too

Co-authored-by: Austin Sasko <austintyler0239@yahoo.com>

.github/workflows/ci.yml

@@ -8,7 +8,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        go: [ '1.20', '1.19', '1.18', '1.17', '1.16' ]
+        go: [ '1.19', '1.18', '1.17', '1.16', '1.15' ]
         os: [ ubuntu-latest, macOS-latest, windows-latest ]
     name: ${{ matrix.os }} Go ${{ matrix.go }} Tests
     steps:

README.md

@@ -75,8 +75,8 @@ import _ "github.com/joho/godotenv/autoload"
 While `.env` in the project root is the default, you don't have to be constrained, both examples below are 100% legit
 
 ```go
-godotenv.Load("somerandomfile")
+_ = godotenv.Load("somerandomfile")
-godotenv.Load("filenumberone.env", "filenumbertwo.env")
+_ = godotenv.Load("filenumberone.env", "filenumbertwo.env")
 ```
 
 If you want to be really fancy with your env file you can do comments and exports (below is a valid env file)
@@ -153,8 +153,6 @@ godotenv -f /some/path/to/.env some_command with some args
 
 If you don't specify `-f` it will fall back on the default of loading `.env` in `PWD`
 
-By default, it won't override existing environment variables; you can do that with the `-o` flag.
-
 ### Writing Env Files
 
 Godotenv can also write a map representing the environment to a correctly-formatted and escaped file

cmd/godotenv/cmd.go

@@ -15,15 +15,13 @@ func main() {
 	flag.BoolVar(&showHelp, "h", false, "show help")
 	var rawEnvFilenames string
 	flag.StringVar(&rawEnvFilenames, "f", "", "comma separated paths to .env files")
-	var overload bool
-	flag.BoolVar(&overload, "o", false, "override existing .env variables")
 
 	flag.Parse()
 
 	usage := `
 Run a process with an env setup from a .env file
 
-godotenv [-o] [-f ENV_FILE_PATHS] COMMAND_ARGS
+godotenv [-f ENV_FILE_PATHS] COMMAND_ARGS
 
 ENV_FILE_PATHS: comma separated paths to .env files
 COMMAND_ARGS: command and args you want to run
@@ -49,7 +47,7 @@ example
 	cmd := args[0]
 	cmdArgs := args[1:]
 
-	err := godotenv.Exec(envFilenames, cmd, cmdArgs, overload)
+	err := godotenv.Exec(envFilenames, cmd, cmdArgs)
 	if err != nil {
 		log.Fatal(err)
 	}

fixtures/equals.env

@@ -1 +1,2 @@
 export OPTION_A='postgres://localhost:5432/database?sslmode=disable'
+

fixtures/plain.env

@@ -5,4 +5,3 @@ OPTION_D =4
 OPTION_E = 5
 OPTION_F = 
 OPTION_G=
-OPTION_H=1 2

godotenv.go

@@ -14,11 +14,13 @@
 package godotenv
 
 import (
-	"bytes"
+	"errors"
 	"fmt"
 	"io"
+	"io/ioutil"
 	"os"
 	"os/exec"
+	"regexp"
 	"sort"
 	"strconv"
 	"strings"
@@ -28,13 +30,12 @@ const doubleQuoteSpecialChars = "\\\n\r\"!$`"
 
 // Parse reads an env file from io.Reader, returning a map of keys and values.
 func Parse(r io.Reader) (map[string]string, error) {
-	var buf bytes.Buffer
+	data, err := ioutil.ReadAll(r)
-	_, err := io.Copy(&buf, r)
 	if err != nil {
 		return nil, err
 	}
 
-	return UnmarshalBytes(buf.Bytes())
+	return UnmarshalBytes(data)
 }
 
 // Load will read your env file(s) and load them into ENV for this process.
@@ -124,13 +125,9 @@ func UnmarshalBytes(src []byte) (map[string]string, error) {
 // Simply hooks up os.Stdin/err/out to the command and calls Run().
 //
 // If you want more fine grained control over your command it's recommended
-// that you use `Load()`, `Overload()` or `Read()` and the `os/exec` package yourself.
+// that you use `Load()` or `Read()` and the `os/exec` package yourself.
-func Exec(filenames []string, cmd string, cmdArgs []string, overload bool) error {
+func Exec(filenames []string, cmd string, cmdArgs []string) error {
-	op := Load
+	if err := Load(filenames...); err != nil {
-	if overload {
-		op = Overload
-	}
-	if err := op(filenames...); err != nil {
 		return err
 	}
 
@@ -213,6 +210,130 @@ func readFile(filename string) (envMap map[string]string, err error) {
 	return Parse(file)
 }
 
+var exportRegex = regexp.MustCompile(`^\s*(?:export\s+)?(.*?)\s*$`)
+
+func parseLine(line string, envMap map[string]string) (key string, value string, err error) {
+	if len(line) == 0 {
+		err = errors.New("zero length string")
+		return
+	}
+
+	// ditch the comments (but keep quoted hashes)
+	if strings.Contains(line, "#") {
+		segmentsBetweenHashes := strings.Split(line, "#")
+		quotesAreOpen := false
+		var segmentsToKeep []string
+		for _, segment := range segmentsBetweenHashes {
+			if strings.Count(segment, "\"") == 1 || strings.Count(segment, "'") == 1 {
+				if quotesAreOpen {
+					quotesAreOpen = false
+					segmentsToKeep = append(segmentsToKeep, segment)
+				} else {
+					quotesAreOpen = true
+				}
+			}
+
+			if len(segmentsToKeep) == 0 || quotesAreOpen {
+				segmentsToKeep = append(segmentsToKeep, segment)
+			}
+		}
+
+		line = strings.Join(segmentsToKeep, "#")
+	}
+
+	firstEquals := strings.Index(line, "=")
+	firstColon := strings.Index(line, ":")
+	splitString := strings.SplitN(line, "=", 2)
+	if firstColon != -1 && (firstColon < firstEquals || firstEquals == -1) {
+		//this is a yaml-style line
+		splitString = strings.SplitN(line, ":", 2)
+	}
+
+	if len(splitString) != 2 {
+		err = errors.New("can't separate key from value")
+		return
+	}
+
+	// Parse the key
+	key = splitString[0]
+
+	key = strings.TrimPrefix(key, "export")
+
+	key = strings.TrimSpace(key)
+
+	key = exportRegex.ReplaceAllString(splitString[0], "$1")
+
+	// Parse the value
+	value = parseValue(splitString[1], envMap)
+	return
+}
+
+var (
+	singleQuotesRegex  = regexp.MustCompile(`\A'(.*)'\z`)
+	doubleQuotesRegex  = regexp.MustCompile(`\A"(.*)"\z`)
+	escapeRegex        = regexp.MustCompile(`\\.`)
+	unescapeCharsRegex = regexp.MustCompile(`\\([^$])`)
+)
+
+func parseValue(value string, envMap map[string]string) string {
+
+	// trim
+	value = strings.Trim(value, " ")
+
+	// check if we've got quoted values or possible escapes
+	if len(value) > 1 {
+		singleQuotes := singleQuotesRegex.FindStringSubmatch(value)
+
+		doubleQuotes := doubleQuotesRegex.FindStringSubmatch(value)
+
+		if singleQuotes != nil || doubleQuotes != nil {
+			// pull the quotes off the edges
+			value = value[1 : len(value)-1]
+		}
+
+		if doubleQuotes != nil {
+			// expand newlines
+			value = escapeRegex.ReplaceAllStringFunc(value, func(match string) string {
+				c := strings.TrimPrefix(match, `\`)
+				switch c {
+				case "n":
+					return "\n"
+				case "r":
+					return "\r"
+				default:
+					return match
+				}
+			})
+			// unescape characters
+			value = unescapeCharsRegex.ReplaceAllString(value, "$1")
+		}
+
+		if singleQuotes == nil {
+			value = expandVariables(value, envMap)
+		}
+	}
+
+	return value
+}
+
+var expandVarRegex = regexp.MustCompile(`(\\)?(\$)(\()?\{?([A-Z0-9_]+)?\}?`)
+
+func expandVariables(v string, m map[string]string) string {
+	return expandVarRegex.ReplaceAllStringFunc(v, func(s string) string {
+		submatch := expandVarRegex.FindStringSubmatch(s)
+
+		if submatch == nil {
+			return s
+		}
+		if submatch[1] == "\\" || submatch[2] == "(" {
+			return submatch[0][1:]
+		} else if submatch[4] != "" {
+			return m[submatch[4]]
+		}
+		return s
+	})
+}
+
 func doubleQuoteEscape(line string) string {
 	for _, c := range doubleQuoteSpecialChars {
 		toReplace := "\\" + string(c)

godotenv_test.go

@@ -12,14 +12,9 @@ import (
 var noopPresets = make(map[string]string)
 
 func parseAndCompare(t *testing.T, rawEnvLine string, expectedKey string, expectedValue string) {
-	result, err := Unmarshal(rawEnvLine)
+	key, value, _ := parseLine(rawEnvLine, noopPresets)
-
+	if key != expectedKey || value != expectedValue {
-	if err != nil {
+		t.Errorf("Expected '%v' to parse as '%v' => '%v', got '%v' => '%v' instead", rawEnvLine, expectedKey, expectedValue, key, value)
-		t.Errorf("Expected %q to parse as %q: %q, errored %q", rawEnvLine, expectedKey, expectedValue, err)
-		return
-	}
-	if result[expectedKey] != expectedValue {
-		t.Errorf("Expected '%v' to parse as '%v' => '%v', got %q instead", rawEnvLine, expectedKey, expectedValue, result)
 	}
 }
 
@@ -85,7 +80,6 @@ func TestReadPlainEnv(t *testing.T) {
 		"OPTION_E": "5",
 		"OPTION_F": "",
 		"OPTION_G": "",
-		"OPTION_H": "1 2",
 	}
 
 	envMap, err := Read(envFileName)
@@ -159,7 +153,6 @@ func TestLoadPlainEnv(t *testing.T) {
 		"OPTION_C": "3",
 		"OPTION_D": "4",
 		"OPTION_E": "5",
-		"OPTION_H": "1 2",
 	}
 
 	loadEnvAndCompareValues(t, Load, envFileName, expectedValues, noopPresets)
@@ -279,6 +272,7 @@ func TestExpanding(t *testing.T) {
 			}
 		})
 	}
+
 }
 
 func TestVariableStringValueSeparator(t *testing.T) {
@@ -375,9 +369,6 @@ func TestParsing(t *testing.T) {
 	// expect(env('foo=bar ')).to eql('foo' => 'bar') # not 'bar '
 	parseAndCompare(t, "FOO=bar ", "FOO", "bar")
 
-	// unquoted internal whitespace is preserved
-	parseAndCompare(t, `KEY=value value`, "KEY", "value value")
-
 	// it 'ignores inline comments' do
 	// expect(env("foo=bar # this is foo")).to eql('foo' => 'bar')
 	parseAndCompare(t, "FOO=bar # this is foo", "FOO", "bar")
@@ -400,8 +391,10 @@ func TestParsing(t *testing.T) {
 	parseAndCompare(t, `FOO="bar\\r\ b\az"`, "FOO", "bar\\r baz")
 
 	parseAndCompare(t, `="value"`, "", "value")
+	parseAndCompare(t, `KEY="`, "KEY", "\"")
+	parseAndCompare(t, `KEY="value`, "KEY", "\"value")
 
-	// unquoted whitespace around keys should be ignored
+	// leading whitespace should be ignored
 	parseAndCompare(t, " KEY =value", "KEY", "value")
 	parseAndCompare(t, "   KEY=value", "KEY", "value")
 	parseAndCompare(t, "\tKEY=value", "KEY", "value")
@@ -409,7 +402,7 @@ func TestParsing(t *testing.T) {
 	// it 'throws an error if line format is incorrect' do
 	// expect{env('lol$wut')}.to raise_error(Dotenv::FormatError)
 	badlyFormattedLine := "lol$wut"
-	_, err := Unmarshal(badlyFormattedLine)
+	_, _, err := parseLine(badlyFormattedLine, noopPresets)
 	if err == nil {
 		t.Errorf("Expected \"%v\" to return error, but it didn't", badlyFormattedLine)
 	}
@@ -527,49 +520,3 @@ func TestRoundtrip(t *testing.T) {
 
 	}
 }
-
-func TestTrailingNewlines(t *testing.T) {
-	cases := map[string]struct {
-		input string
-		key   string
-		value string
-	}{
-		"Simple value without trailing newline": {
-			input: "KEY=value",
-			key:   "KEY",
-			value: "value",
-		},
-		"Value with internal whitespace without trailing newline": {
-			input: "KEY=value value",
-			key:   "KEY",
-			value: "value value",
-		},
-		"Value with internal whitespace with trailing newline": {
-			input: "KEY=value value\n",
-			key:   "KEY",
-			value: "value value",
-		},
-		"YAML style - value with internal whitespace without trailing newline": {
-			input: "KEY: value value",
-			key:   "KEY",
-			value: "value value",
-		},
-		"YAML style - value with internal whitespace with trailing newline": {
-			input: "KEY: value value\n",
-			key:   "KEY",
-			value: "value value",
-		},
-	}
-
-	for n, c := range cases {
-		t.Run(n, func(t *testing.T) {
-			result, err := Unmarshal(c.input)
-			if err != nil {
-				t.Errorf("Input: %q Unexpected error:\t%q", c.input, err)
-			}
-			if result[c.key] != c.value {
-				t.Errorf("Input %q Expected:\t %q/%q\nGot:\t %q", c.input, c.key, c.value, result)
-			}
-		})
-	}
-}

parser.go

@@ -4,7 +4,6 @@ import (
 	"bytes"
 	"errors"
 	"fmt"
-	"regexp"
 	"strings"
 	"unicode"
 )
@@ -70,13 +69,7 @@ func getStatementStart(src []byte) []byte {
 // locateKeyName locates and parses key name and returns rest of slice
 func locateKeyName(src []byte) (key string, cutset []byte, err error) {
 	// trim "export" and space at beginning
-	src = bytes.TrimLeftFunc(src, isSpace)
+	src = bytes.TrimLeftFunc(bytes.TrimPrefix(src, []byte(exportPrefix)), isSpace)
-	if bytes.HasPrefix(src, []byte(exportPrefix)) {
-		trimmed := bytes.TrimPrefix(src, []byte(exportPrefix))
-		if bytes.IndexFunc(trimmed, isSpace) == 0 {
-			src = bytes.TrimLeftFunc(trimmed, isSpace)
-		}
-	}
 
 	// locate key name end and validate it in single loop
 	offset := 0
@@ -95,8 +88,8 @@ loop:
 			break loop
 		case '_':
 		default:
-			// variable name should match [A-Za-z0-9_.]
+			// variable name should match [A-Za-z0-9_]
-			if unicode.IsLetter(rchar) || unicode.IsNumber(rchar) || rchar == '.' {
+			if unicode.IsLetter(rchar) || unicode.IsNumber(rchar) {
 				continue
 			}
 
@@ -120,41 +113,13 @@ loop:
 func extractVarValue(src []byte, vars map[string]string) (value string, rest []byte, err error) {
 	quote, hasPrefix := hasQuotePrefix(src)
 	if !hasPrefix {
-		// unquoted value - read until end of line
+		// unquoted value - read until whitespace
-		endOfLine := bytes.IndexFunc(src, isLineEnd)
+		end := bytes.IndexFunc(src, unicode.IsSpace)
-
+		if end == -1 {
-		// Hit EOF without a trailing newline
+			return expandVariables(string(src), vars), nil, nil
-		if endOfLine == -1 {
-			endOfLine = len(src)
-
-			if endOfLine == 0 {
-				return "", nil, nil
-			}
 		}
 
-		// Convert line to rune away to do accurate countback of runes
+		return expandVariables(string(src[0:end]), vars), src[end:], nil
-		line := []rune(string(src[0:endOfLine]))
-
-		// Assume end of line is end of var
-		endOfVar := len(line)
-		if endOfVar == 0 {
-			return "", src[endOfLine:], nil
-		}
-
-		// Work backwards to check if the line ends in whitespace then
-		// a comment (ie asdasd # some comment)
-		for i := endOfVar - 1; i >= 0; i-- {
-			if line[i] == charComment && i > 0 {
-				if isSpace(line[i-1]) {
-					endOfVar = i
-					break
-				}
-			}
-		}
-
-		trimmed := strings.TrimFunc(string(line[0:endOfVar]), isSpace)
-
-		return expandVariables(trimmed, vars), src[endOfLine:], nil
 	}
 
 	// lookup quoted string terminator
@@ -240,32 +205,3 @@ func isSpace(r rune) bool {
 	}
 	return false
 }
-
-func isLineEnd(r rune) bool {
-	if r == '\n' || r == '\r' {
-		return true
-	}
-	return false
-}
-
-var (
-	escapeRegex        = regexp.MustCompile(`\\.`)
-	expandVarRegex     = regexp.MustCompile(`(\\)?(\$)(\()?\{?([A-Z0-9_]+)?\}?`)
-	unescapeCharsRegex = regexp.MustCompile(`\\([^$])`)
-)
-
-func expandVariables(v string, m map[string]string) string {
-	return expandVarRegex.ReplaceAllStringFunc(v, func(s string) string {
-		submatch := expandVarRegex.FindStringSubmatch(s)
-
-		if submatch == nil {
-			return s
-		}
-		if submatch[1] == "\\" || submatch[2] == "(" {
-			return submatch[0][1:]
-		} else if submatch[4] != "" {
-			return m[submatch[4]]
-		}
-		return s
-	})
-}