From 2e24114804826c54b2534c60c4bc473b4714b1cb Mon Sep 17 00:00:00 2001
From: Mikko Ahlroth <mikko@ahlroth.fi>
Date: Thu, 21 Jan 2021 07:10:39 +0200
Subject: [PATCH] Support lines starting with export

---
 lib/dotenv_parser.ex        | 7 +++++--
 mix.exs                     | 2 +-
 test/data/.env              | 1 +
 test/dotenv_parser_test.exs | 3 ++-
 4 files changed, 9 insertions(+), 4 deletions(-)

diff --git a/lib/dotenv_parser.ex b/lib/dotenv_parser.ex
index 0e38673..c2ae23b 100644
--- a/lib/dotenv_parser.ex
+++ b/lib/dotenv_parser.ex
@@ -20,6 +20,9 @@ defmodule DotenvParser do
   * `\\\\` - Backslash
   * `\\uFFFF` - Unicode escape (4 hex characters to denote the codepoint)
 
+  A line can start with `export ` for easier interoperation with regular shell scripts. These lines are treated the
+  same as any others.
+
   ## Serving suggestion
 
   If you load lots of environment variables in `config/runtime.exs`, you can easily configure them for development by
@@ -38,7 +41,7 @@ defmodule DotenvParser do
   """
 
   @linefeed_re ~R/\r?\n/
-  @line_re ~R/^\s*[a-z_][a-z_0-9]*\s*=/i
+  @line_re ~R/^(?:\s*export)?\s*[a-z_][a-z_0-9]*\s*=/i
   @dquoted_val_re ~R/^\s*"(.*)(?!\\)"\s*(?:#.*)?$/
   @squoted_val_re ~R/^\s*'(.*)(?!\\)'\s*(?:#.*)?$/
   @hex_re ~R/^[0-9a-f]+$/i
@@ -114,7 +117,7 @@ defmodule DotenvParser do
       raise ParseError, "Malformed line cannot be parsed: #{line}"
     else
       [var, val] = String.split(line, "=", parts: 2)
-      var = String.trim(var)
+      var = var |> String.trim() |> String.replace_leading("export ", "")
       val = String.trim(val)
 
       with {:dquoted, nil} <- {:dquoted, Regex.run(@dquoted_val_re, val)},
diff --git a/mix.exs b/mix.exs
index ca98e1f..6026e7c 100644
--- a/mix.exs
+++ b/mix.exs
@@ -4,7 +4,7 @@ defmodule DotenvParser.MixProject do
   def project do
     [
       app: :dotenv_parser,
-      version: "1.0.0",
+      version: "1.1.0",
       elixir: "~> 1.11",
       start_permanent: Mix.env() == :prod,
       deps: deps(),
diff --git a/test/data/.env b/test/data/.env
index 50c7676..3201250 100644
--- a/test/data/.env
+++ b/test/data/.env
@@ -29,3 +29,4 @@ INLINE_COMMENT="foo#bar" # Bark Bark
 INLINE_COMMENT_PLAIN=foo bar # Bark Bark
 END_BACKSLASH="something\" # Comment
 lowercased_var=foo
+export FOO="exports are supported"
diff --git a/test/dotenv_parser_test.exs b/test/dotenv_parser_test.exs
index c5ad954..071260f 100644
--- a/test/dotenv_parser_test.exs
+++ b/test/dotenv_parser_test.exs
@@ -30,7 +30,8 @@ defmodule DotenvParserTest do
              {"INLINE_COMMENT", "foo#bar"},
              {"INLINE_COMMENT_PLAIN", "foo bar"},
              {"END_BACKSLASH", "something\\"},
-             {"lowercased_var", "foo"}
+             {"lowercased_var", "foo"},
+             {"FOO", "exports are supported"}
            ]
   end