Merge pull request #41 from alexquick/document-write-dotenv

Document Marshal, Unmarshal, and Write

.travis.yml

@@ -0,0 +1,8 @@
+language: go
+
+go:
+  - 1.8
+
+os:
+  - linux
+  - osx

README.md

@@ -1,4 +1,4 @@
-# GoDotEnv [![wercker status](https://app.wercker.com/status/507594c2ec7e60f19403a568dfea0f78 "wercker status")](https://app.wercker.com/project/bykey/507594c2ec7e60f19403a568dfea0f78)
+# GoDotEnv [![Build Status](https://travis-ci.org/joho/godotenv.svg?branch=master)](https://travis-ci.org/joho/godotenv) [![Build status](https://ci.appveyor.com/api/projects/status/9v40vnfvvgde64u4?svg=true)](https://ci.appveyor.com/project/joho/godotenv) [![Go Report Card](https://goreportcard.com/badge/github.com/joho/godotenv)](https://goreportcard.com/report/github.com/joho/godotenv)
 
 A Go (golang) port of the Ruby dotenv project (which loads env vars from a .env file)
 
@@ -8,12 +8,23 @@ From the original Library:
 >
 > But it is not always practical to set environment variables on development machines or continuous integration servers where multiple projects are run. Dotenv load variables from a .env file into ENV when the environment is bootstrapped.
 
+It can be used as a library (for loading in env for your own daemons etc) or as a bin command.
+
+There is test coverage and CI for both linuxish and windows environments, but I make no guarantees about the bin version working on windows.
+
 ## Installation
 
+As a library
+
 ```shell
 go get github.com/joho/godotenv
 ```
 
+or if you want to use it as a bin command
+```shell
+go get github.com/joho/godotenv/cmd/godotenv
+```
+
 ## Usage
 
 Add your application configuration to your `.env` file in the root of your project:
@@ -85,7 +96,45 @@ myEnv, err := godotenv.Read()
 s3Bucket := myEnv["S3_BUCKET"]
 ```
 
-end
+... or from an `io.Reader` instead of a local file
+
+```go
+reader := getRemoteFile()
+myEnv, err := godotenv.Parse(reader)
+```
+
+... or from a `string` if you so desire
+
+```go
+content := getRemoteFileContent()
+myEnv, err := godotenv.Unmarshal(content)
+```
+
+### Command Mode
+
+Assuming you've installed the command as above and you've got `$GOPATH/bin` in your `$PATH`
+
+```
+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`
+
+### Writing Env Files
+
+Godotenv can also write a map representing the environment to a correctly-formatted and escaped file
+
+```go
+env, err := godotenv.Unmarshal("KEY=value")
+err := godotenv.Write(env, "./.env")
+```
+
+... or to a string
+
+```go
+env, err := godotenv.Unmarshal("KEY=value")
+content, err := godotenv.Marshal(env)
+```
 
 ## Contributing
 
@@ -99,9 +148,15 @@ Contributions are most welcome! The parser itself is pretty stupidly naive and I
 4. Push to the branch (`git push origin my-new-feature`)
 5. Create new Pull Request
 
+## Releases
+
+Releases should follow [Semver](http://semver.org/) though the first couple of releases are `v1` and `v1.1`.
+
+Use [annotated tags for all releases](https://github.com/joho/godotenv/issues/30). Example `git tag -a v1.2.1`
+
 ## CI
 
-Linux: [![wercker status](https://app.wercker.com/status/507594c2ec7e60f19403a568dfea0f78/m "wercker status")](https://app.wercker.com/project/bykey/507594c2ec7e60f19403a568dfea0f78) Windows: [![Build status](https://ci.appveyor.com/api/projects/status/9v40vnfvvgde64u4)](https://ci.appveyor.com/project/joho/godotenv)
+Linux: [![Build Status](https://travis-ci.org/joho/godotenv.svg?branch=master)](https://travis-ci.org/joho/godotenv) Windows: [![Build status](https://ci.appveyor.com/api/projects/status/9v40vnfvvgde64u4)](https://ci.appveyor.com/project/joho/godotenv)
 
 ## Who?
 

autoload/autoload.go

@@ -11,5 +11,5 @@ package autoload
 import "github.com/joho/godotenv"
 
 func init() {
-	_ = godotenv.Load()
+	godotenv.Load()
 }

cmd/godotenv/cmd.go

@@ -45,7 +45,7 @@ example
 
 	// take rest of args and "exec" them
 	cmd := args[0]
-	cmdArgs := args[1:len(args)]
+	cmdArgs := args[1:]
 
 	err := godotenv.Exec(envFilenames, cmd, cmdArgs)
 	if err != nil {

fixtures/invalid1.env

@@ -0,0 +1,2 @@
+INVALID LINE
+foo=bar

fixtures/plain.env

@@ -3,3 +3,5 @@ OPTION_B=2
 OPTION_C= 3
 OPTION_D =4
 OPTION_E = 5
+OPTION_F = 
+OPTION_G=

godotenv.go

@@ -1,44 +1,48 @@
-/*
+// Package godotenv is a go port of the ruby dotenv library (https://github.com/bkeepers/dotenv)
-A go port of the ruby dotenv library (https://github.com/bkeepers/dotenv)
+//
-
+// Examples/readme can be found on the github page at https://github.com/joho/godotenv
-Examples/readme can be found on the github page at https://github.com/joho/godotenv
+//
-
+// The TL;DR is that you make a .env file that looks something like
-The TL;DR is that you make a .env file that looks something like
+//
-
+// 		SOME_ENV_VAR=somevalue
-		SOME_ENV_VAR=somevalue
+//
-
+// and then in your go code you can call
-and then in your go code you can call
+//
-
+// 		godotenv.Load()
-		godotenv.Load()
+//
-
+// and all the env vars declared in .env will be available through os.Getenv("SOME_ENV_VAR")
-and all the env vars declared in .env will be avaiable through os.Getenv("SOME_ENV_VAR")
-*/
 package godotenv
 
 import (
 	"bufio"
 	"errors"
+	"fmt"
+	"io"
 	"os"
 	"os/exec"
+	"regexp"
+	"sort"
 	"strings"
 )
 
-/*
+const doubleQuoteSpecialChars = "\\\n\r\"!$`"
-	Call this function as close as possible to the start of your program (ideally in main)
 
-	If you call Load without any args it will default to loading .env in the current path
+// Load will read your env file(s) and load them into ENV for this process.
-
+//
-	You can otherwise tell it which files to load (there can be more than one) like
+// Call this function as close as possible to the start of your program (ideally in main)
-
+//
-		godotenv.Load("fileone", "filetwo")
+// If you call Load without any args it will default to loading .env in the current path
-
+//
-	It's important to note that it WILL NOT OVERRIDE an env variable that already exists - consider the .env file to set dev vars or sensible defaults
+// You can otherwise tell it which files to load (there can be more than one) like
-*/
+//
+//		godotenv.Load("fileone", "filetwo")
+//
+// It's important to note that it WILL NOT OVERRIDE an env variable that already exists - consider the .env file to set dev vars or sensible defaults
 func Load(filenames ...string) (err error) {
 	filenames = filenamesOrDefault(filenames)
 
 	for _, filename := range filenames {
-		err = loadFile(filename)
+		err = loadFile(filename, false)
 		if err != nil {
 			return // return early on a spazout
 		}
@@ -46,10 +50,31 @@ func Load(filenames ...string) (err error) {
 	return
 }
 
-/*
+// Overload will read your env file(s) and load them into ENV for this process.
-  Read all env (with same file loading semantics as Load) but return values as
+//
-  a map rather than automatically writing values into env
+// Call this function as close as possible to the start of your program (ideally in main)
-*/
+//
+// If you call Overload without any args it will default to loading .env in the current path
+//
+// You can otherwise tell it which files to load (there can be more than one) like
+//
+//		godotenv.Overload("fileone", "filetwo")
+//
+// It's important to note this WILL OVERRIDE an env variable that already exists - consider the .env file to forcefilly set all vars.
+func Overload(filenames ...string) (err error) {
+	filenames = filenamesOrDefault(filenames)
+
+	for _, filename := range filenames {
+		err = loadFile(filename, true)
+		if err != nil {
+			return // return early on a spazout
+		}
+	}
+	return
+}
+
+// Read all env (with same file loading semantics as Load) but return values as
+// a map rather than automatically writing values into env
 func Read(filenames ...string) (envMap map[string]string, err error) {
 	filenames = filenamesOrDefault(filenames)
 	envMap = make(map[string]string)
@@ -70,15 +95,46 @@ func Read(filenames ...string) (envMap map[string]string, err error) {
 	return
 }
 
-/*
+// Parse reads an env file from io.Reader, returning a map of keys and values.
-  Loads env vars from the specified filenames (empty map falls back to default)
+func Parse(r io.Reader) (envMap map[string]string, err error) {
-  then executes the cmd specified.
+	envMap = make(map[string]string)
 
-  Simply hooks up os.Stdin/err/out to the command and calls Run()
+	var lines []string
+	scanner := bufio.NewScanner(r)
+	for scanner.Scan() {
+		lines = append(lines, scanner.Text())
+	}
 
-  If you want more fine grained control over your command it's recommended
+	if err = scanner.Err(); err != nil {
-  that you use `Load()` or `Read()` and the `os/exec` package yourself.
+		return
-*/
+	}
+
+	for _, fullLine := range lines {
+		if !isIgnoredLine(fullLine) {
+			var key, value string
+			key, value, err = parseLine(fullLine)
+
+			if err != nil {
+				return
+			}
+			envMap[key] = value
+		}
+	}
+	return
+}
+
+//Unmarshal reads an env file from a string, returning a map of keys and values.
+func Unmarshal(str string) (envMap map[string]string, err error) {
+	return Parse(strings.NewReader(str))
+}
+
+// Exec loads env vars from the specified filenames (empty map falls back to default)
+// then executes the cmd specified.
+//
+// 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()` or `Read()` and the `os/exec` package yourself.
 func Exec(filenames []string, cmd string, cmdArgs []string) error {
 	Load(filenames...)
 
@@ -89,25 +145,58 @@ func Exec(filenames []string, cmd string, cmdArgs []string) error {
 	return command.Run()
 }
 
+// Write serializes the given environment and writes it to a file
+func Write(envMap map[string]string, filename string) error {
+	content, error := Marshal(envMap)
+	if error != nil {
+		return error
+	}
+	file, error := os.Create(filename)
+	if error != nil {
+		return error
+	}
+	_, err := file.WriteString(content)
+	return err
+}
+
+// Marshal outputs the given environment as a dotenv-formatted environment file.
+// Each line is in the format: KEY="VALUE" where VALUE is backslash-escaped.
+func Marshal(envMap map[string]string) (string, error) {
+	lines := make([]string, 0, len(envMap))
+	for k, v := range envMap {
+		lines = append(lines, fmt.Sprintf(`%s="%s"`, k, doubleQuoteEscape(v)))
+	}
+	sort.Strings(lines)
+	return strings.Join(lines, "\n"), nil
+}
+
 func filenamesOrDefault(filenames []string) []string {
 	if len(filenames) == 0 {
 		return []string{".env"}
-	} else {
-		return filenames
 	}
+	return filenames
 }
 
-func loadFile(filename string) (err error) {
+func loadFile(filename string, overload bool) error {
 	envMap, err := readFile(filename)
 	if err != nil {
-		return
+		return err
+	}
+
+	currentEnv := map[string]bool{}
+	rawEnv := os.Environ()
+	for _, rawEnvLine := range rawEnv {
+		key := strings.Split(rawEnvLine, "=")[0]
+		currentEnv[key] = true
 	}
 
 	for key, value := range envMap {
-		os.Setenv(key, value)
+		if !currentEnv[key] || overload {
+			os.Setenv(key, value)
+		}
 	}
 
-	return
+	return nil
 }
 
 func readFile(filename string) (envMap map[string]string, err error) {
@@ -117,24 +206,7 @@ func readFile(filename string) (envMap map[string]string, err error) {
 	}
 	defer file.Close()
 
-	envMap = make(map[string]string)
+	return Parse(file)
-
-	var lines []string
-	scanner := bufio.NewScanner(file)
-	for scanner.Scan() {
-		lines = append(lines, scanner.Text())
-	}
-
-	for _, fullLine := range lines {
-		if !isIgnoredLine(fullLine) {
-			key, value, err := parseLine(fullLine)
-
-			if err == nil && os.Getenv(key) == "" {
-				envMap[key] = value
-			}
-		}
-	}
-	return
 }
 
 func parseLine(line string) (key string, value string, err error) {
@@ -147,7 +219,7 @@ func parseLine(line string) (key string, value string, err error) {
 	if strings.Contains(line, "#") {
 		segmentsBetweenHashes := strings.Split(line, "#")
 		quotesAreOpen := false
-		segmentsToKeep := make([]string, 0)
+		var segmentsToKeep []string
 		for _, segment := range segmentsBetweenHashes {
 			if strings.Count(segment, "\"") == 1 || strings.Count(segment, "'") == 1 {
 				if quotesAreOpen {
@@ -166,11 +238,11 @@ func parseLine(line string) (key string, value string, err error) {
 		line = strings.Join(segmentsToKeep, "#")
 	}
 
-	// now split key from value
+	firstEquals := strings.Index(line, "=")
+	firstColon := strings.Index(line, ":")
 	splitString := strings.SplitN(line, "=", 2)
-
+	if firstColon != -1 && (firstColon < firstEquals || firstEquals == -1) {
-	if len(splitString) != 2 {
+		//this is a yaml-style line
-		// try yaml mode!
 		splitString = strings.SplitN(line, ":", 2)
 	}
 
@@ -187,25 +259,56 @@ func parseLine(line string) (key string, value string, err error) {
 	key = strings.Trim(key, " ")
 
 	// Parse the value
-	value = splitString[1]
+	value = parseValue(splitString[1])
+	return
+}
+
+func parseValue(value string) string {
+
 	// trim
 	value = strings.Trim(value, " ")
 
-	// check if we've got quoted values
+	// check if we've got quoted values or possible escapes
-	if strings.Count(value, "\"") == 2 || strings.Count(value, "'") == 2 {
+	if len(value) > 1 {
-		// pull the quotes off the edges
+		first := string(value[0:1])
-		value = strings.Trim(value, "\"'")
+		last := string(value[len(value)-1:])
-
+		if first == last && strings.ContainsAny(first, `"'`) {
-		// expand quotes
+			// pull the quotes off the edges
-		value = strings.Replace(value, "\\\"", "\"", -1)
+			value = value[1 : len(value)-1]
-		// expand newlines
+			// handle escapes
-		value = strings.Replace(value, "\\n", "\n", -1)
+			escapeRegex := regexp.MustCompile(`\\.`)
+			value = escapeRegex.ReplaceAllStringFunc(value, func(match string) string {
+				c := strings.TrimPrefix(match, `\`)
+				switch c {
+				case "n":
+					return "\n"
+				case "r":
+					return "\r"
+				default:
+					return c
+				}
+			})
+		}
 	}
 
-	return
+	return value
 }
 
 func isIgnoredLine(line string) bool {
 	trimmedLine := strings.Trim(line, " \n\t")
 	return len(trimmedLine) == 0 || strings.HasPrefix(trimmedLine, "#")
 }
+
+func doubleQuoteEscape(line string) string {
+	for _, c := range doubleQuoteSpecialChars {
+		toReplace := "\\" + string(c)
+		if c == '\n' {
+			toReplace = `\n`
+		}
+		if c == '\r' {
+			toReplace = `\r`
+		}
+		line = strings.Replace(line, string(c), toReplace, -1)
+	}
+	return line
+}

godotenv_test.go

@@ -1,10 +1,15 @@
 package godotenv
 
 import (
+	"bytes"
+	"fmt"
 	"os"
+	"reflect"
 	"testing"
 )
 
+var noopPresets = make(map[string]string)
+
 func parseAndCompare(t *testing.T, rawEnvLine string, expectedKey string, expectedValue string) {
 	key, value, _ := parseLine(rawEnvLine)
 	if key != expectedKey || value != expectedValue {
@@ -12,11 +17,15 @@ func parseAndCompare(t *testing.T, rawEnvLine string, expectedKey string, expect
 	}
 }
 
-func loadEnvAndCompareValues(t *testing.T, envFileName string, expectedValues map[string]string) {
+func loadEnvAndCompareValues(t *testing.T, loader func(files ...string) error, envFileName string, expectedValues map[string]string, presets map[string]string) {
 	// first up, clear the env
 	os.Clearenv()
 
-	err := Load(envFileName)
+	for k, v := range presets {
+		os.Setenv(k, v)
+	}
+
+	err := loader(envFileName)
 	if err != nil {
 		t.Fatalf("Error loading %v", envFileName)
 	}
@@ -38,6 +47,14 @@ func TestLoadWithNoArgsLoadsDotEnv(t *testing.T) {
 	}
 }
 
+func TestOverloadWithNoArgsOverloadsDotEnv(t *testing.T) {
+	err := Overload()
+	pathError := err.(*os.PathError)
+	if pathError == nil || pathError.Op != "open" || pathError.Path != ".env" {
+		t.Errorf("Didn't try and open .env by default")
+	}
+}
+
 func TestLoadFileNotFound(t *testing.T) {
 	err := Load("somefilethatwillneverexistever.env")
 	if err == nil {
@@ -45,6 +62,13 @@ func TestLoadFileNotFound(t *testing.T) {
 	}
 }
 
+func TestOverloadFileNotFound(t *testing.T) {
+	err := Overload("somefilethatwillneverexistever.env")
+	if err == nil {
+		t.Error("File wasn't found but Overload didn't return an error")
+	}
+}
+
 func TestReadPlainEnv(t *testing.T) {
 	envFileName := "fixtures/plain.env"
 	expectedValues := map[string]string{
@@ -53,6 +77,8 @@ func TestReadPlainEnv(t *testing.T) {
 		"OPTION_C": "3",
 		"OPTION_D": "4",
 		"OPTION_E": "5",
+		"OPTION_F": "",
+		"OPTION_G": "",
 	}
 
 	envMap, err := Read(envFileName)
@@ -71,6 +97,53 @@ func TestReadPlainEnv(t *testing.T) {
 	}
 }
 
+func TestParse(t *testing.T) {
+	envMap, err := Parse(bytes.NewReader([]byte("ONE=1\nTWO='2'\nTHREE = \"3\"")))
+	expectedValues := map[string]string{
+		"ONE":   "1",
+		"TWO":   "2",
+		"THREE": "3",
+	}
+	if err != nil {
+		t.Fatalf("error parsing env: %v", err)
+	}
+	for key, value := range expectedValues {
+		if envMap[key] != value {
+			t.Errorf("expected %s to be %s, got %s", key, value, envMap[key])
+		}
+	}
+}
+
+func TestLoadDoesNotOverride(t *testing.T) {
+	envFileName := "fixtures/plain.env"
+
+	// ensure NO overload
+	presets := map[string]string{
+		"OPTION_A": "do_not_override",
+		"OPTION_B": "",
+	}
+
+	expectedValues := map[string]string{
+		"OPTION_A": "do_not_override",
+		"OPTION_B": "",
+	}
+	loadEnvAndCompareValues(t, Load, envFileName, expectedValues, presets)
+}
+
+func TestOveroadDoesOverride(t *testing.T) {
+	envFileName := "fixtures/plain.env"
+
+	// ensure NO overload
+	presets := map[string]string{
+		"OPTION_A": "do_not_override",
+	}
+
+	expectedValues := map[string]string{
+		"OPTION_A": "1",
+	}
+	loadEnvAndCompareValues(t, Overload, envFileName, expectedValues, presets)
+}
+
 func TestLoadPlainEnv(t *testing.T) {
 	envFileName := "fixtures/plain.env"
 	expectedValues := map[string]string{
@@ -81,7 +154,7 @@ func TestLoadPlainEnv(t *testing.T) {
 		"OPTION_E": "5",
 	}
 
-	loadEnvAndCompareValues(t, envFileName, expectedValues)
+	loadEnvAndCompareValues(t, Load, envFileName, expectedValues, noopPresets)
 }
 
 func TestLoadExportedEnv(t *testing.T) {
@@ -91,7 +164,7 @@ func TestLoadExportedEnv(t *testing.T) {
 		"OPTION_B": "\n",
 	}
 
-	loadEnvAndCompareValues(t, envFileName, expectedValues)
+	loadEnvAndCompareValues(t, Load, envFileName, expectedValues, noopPresets)
 }
 
 func TestLoadEqualsEnv(t *testing.T) {
@@ -100,7 +173,7 @@ func TestLoadEqualsEnv(t *testing.T) {
 		"OPTION_A": "postgres://localhost:5432/database?sslmode=disable",
 	}
 
-	loadEnvAndCompareValues(t, envFileName, expectedValues)
+	loadEnvAndCompareValues(t, Load, envFileName, expectedValues, noopPresets)
 }
 
 func TestLoadQuotedEnv(t *testing.T) {
@@ -116,7 +189,7 @@ func TestLoadQuotedEnv(t *testing.T) {
 		"OPTION_H": "\n",
 	}
 
-	loadEnvAndCompareValues(t, envFileName, expectedValues)
+	loadEnvAndCompareValues(t, Load, envFileName, expectedValues, noopPresets)
 }
 
 func TestActualEnvVarsAreLeftAlone(t *testing.T) {
@@ -138,24 +211,33 @@ func TestParsing(t *testing.T) {
 	parseAndCompare(t, "FOO= bar", "FOO", "bar")
 
 	// parses double quoted values
-	parseAndCompare(t, "FOO=\"bar\"", "FOO", "bar")
+	parseAndCompare(t, `FOO="bar"`, "FOO", "bar")
 
 	// parses single quoted values
 	parseAndCompare(t, "FOO='bar'", "FOO", "bar")
 
 	// parses escaped double quotes
-	parseAndCompare(t, "FOO=escaped\\\"bar\"", "FOO", "escaped\"bar")
+	parseAndCompare(t, `FOO="escaped\"bar"`, "FOO", `escaped"bar`)
+
+	// parses single quotes inside double quotes
+	parseAndCompare(t, `FOO="'d'"`, "FOO", `'d'`)
 
 	// parses yaml style options
 	parseAndCompare(t, "OPTION_A: 1", "OPTION_A", "1")
 
+	//parses yaml values with equal signs
+	parseAndCompare(t, "OPTION_A: Foo=bar", "OPTION_A", "Foo=bar")
+
+	// parses non-yaml options with colons
+	parseAndCompare(t, "OPTION_A=1:B", "OPTION_A", "1:B")
+
 	// parses export keyword
 	parseAndCompare(t, "export OPTION_A=2", "OPTION_A", "2")
-	parseAndCompare(t, "export OPTION_B='\\n'", "OPTION_B", "\n")
+	parseAndCompare(t, `export OPTION_B='\n'`, "OPTION_B", "\n")
 
 	// it 'expands newlines in quoted strings' do
 	// expect(env('FOO="bar\nbaz"')).to eql('FOO' => "bar\nbaz")
-	parseAndCompare(t, "FOO=\"bar\\nbaz\"", "FOO", "bar\nbaz")
+	parseAndCompare(t, `FOO="bar\nbaz"`, "FOO", "bar\nbaz")
 
 	// it 'parses varibales with "." in the name' do
 	// expect(env('FOO.BAR=foobar')).to eql('FOO.BAR' => 'foobar')
@@ -175,16 +257,25 @@ func TestParsing(t *testing.T) {
 
 	// it 'allows # in quoted value' do
 	// expect(env('foo="bar#baz" # comment')).to eql('foo' => 'bar#baz')
-	parseAndCompare(t, "FOO=\"bar#baz\" # comment", "FOO", "bar#baz")
+	parseAndCompare(t, `FOO="bar#baz" # comment`, "FOO", "bar#baz")
 	parseAndCompare(t, "FOO='bar#baz' # comment", "FOO", "bar#baz")
-	parseAndCompare(t, "FOO=\"bar#baz#bang\" # comment", "FOO", "bar#baz#bang")
+	parseAndCompare(t, `FOO="bar#baz#bang" # comment`, "FOO", "bar#baz#bang")
 
 	// it 'parses # in quoted values' do
 	// expect(env('foo="ba#r"')).to eql('foo' => 'ba#r')
 	// expect(env("foo='ba#r'")).to eql('foo' => 'ba#r')
-	parseAndCompare(t, "FOO=\"ba#r\"", "FOO", "ba#r")
+	parseAndCompare(t, `FOO="ba#r"`, "FOO", "ba#r")
 	parseAndCompare(t, "FOO='ba#r'", "FOO", "ba#r")
 
+	//newlines and backslashes should be escaped
+	parseAndCompare(t, `FOO="bar\n\ b\az"`, "FOO", "bar\n baz")
+	parseAndCompare(t, `FOO="bar\\\n\ b\az"`, "FOO", "bar\\\n baz")
+	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")
+
 	// it 'throws an error if line format is incorrect' do
 	// expect{env('lol$wut')}.to raise_error(Dotenv::FormatError)
 	badlyFormattedLine := "lol$wut"
@@ -216,7 +307,71 @@ func TestLinesToIgnore(t *testing.T) {
 	}
 
 	// make sure we're not getting false positives
-	if isIgnoredLine("export OPTION_B='\\n'") {
+	if isIgnoredLine(`export OPTION_B='\n'`) {
 		t.Error("ignoring a perfectly valid line to parse")
 	}
 }
+
+func TestErrorReadDirectory(t *testing.T) {
+	envFileName := "fixtures/"
+	envMap, err := Read(envFileName)
+
+	if err == nil {
+		t.Errorf("Expected error, got %v", envMap)
+	}
+}
+
+func TestErrorParsing(t *testing.T) {
+	envFileName := "fixtures/invalid1.env"
+	envMap, err := Read(envFileName)
+	if err == nil {
+		t.Errorf("Expected error, got %v", envMap)
+	}
+}
+
+func TestWrite(t *testing.T) {
+	writeAndCompare := func(env string, expected string) {
+		envMap, _ := Unmarshal(env)
+		actual, _ := Marshal(envMap)
+		if expected != actual {
+			t.Errorf("Expected '%v' (%v) to write as '%v', got '%v' instead.", env, envMap, expected, actual)
+		}
+	}
+	//just test some single lines to show the general idea
+	//TestRoundtrip makes most of the good assertions
+
+	//values are always double-quoted
+	writeAndCompare(`key=value`, `key="value"`)
+	//double-quotes are escaped
+	writeAndCompare(`key=va"lu"e`, `key="va\"lu\"e"`)
+	//but single quotes are left alone
+	writeAndCompare(`key=va'lu'e`, `key="va'lu'e"`)
+	// newlines, backslashes, and some other special chars are escaped
+	writeAndCompare(`foo="$ba\n\r\\r!"`, `foo="\$ba\n\r\\r\!"`)
+	// lines should be sorted
+	writeAndCompare("foo=bar\nbaz=buzz", "baz=\"buzz\"\nfoo=\"bar\"")
+
+}
+
+func TestRoundtrip(t *testing.T) {
+	fixtures := []string{"equals.env", "exported.env", "plain.env", "quoted.env"}
+	for _, fixture := range fixtures {
+		fixtureFilename := fmt.Sprintf("fixtures/%s", fixture)
+		env, err := readFile(fixtureFilename)
+		if err != nil {
+			t.Errorf("Expected '%s' to read without error (%v)", fixtureFilename, err)
+		}
+		rep, err := Marshal(env)
+		if err != nil {
+			t.Errorf("Expected '%s' to Marshal (%v)", fixtureFilename, err)
+		}
+		roundtripped, err := Unmarshal(rep)
+		if err != nil {
+			t.Errorf("Expected '%s' to Mashal and Unmarshal (%v)", fixtureFilename, err)
+		}
+		if !reflect.DeepEqual(env, roundtripped) {
+			t.Errorf("Expected '%s' to roundtrip as '%v', got '%v' instead", fixtureFilename, env, roundtripped)
+		}
+
+	}
+}

wercker.yml

@@ -1 +0,0 @@
-box: pjvds/golang