From 9cf8a7b2c43d0549cd2892b0af203b7c13cd0ba0 Mon Sep 17 00:00:00 2001
From: Lars Wirzenius <liw@liw.fi>
Date: Tue, 11 Apr 2017 14:46:35 +0300
Subject: Add yarnutils.get_next_match

---
 fail-tests/fail.stdout-diff |  4 ++--
 yarnutils/__init__.py       |  1 +
 yarnutils/matches.py        | 41 ++++++++++++++++++++++++++++++++++
 yarnutils/matches_tests.py  | 54 +++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 98 insertions(+), 2 deletions(-)
 create mode 100644 yarnutils/matches.py
 create mode 100644 yarnutils/matches_tests.py

diff --git a/fail-tests/fail.stdout-diff b/fail-tests/fail.stdout-diff
index b4fe31a..2ecb049 100644
--- a/fail-tests/fail.stdout-diff
+++ b/fail-tests/fail.stdout-diff
@@ -1,4 +1,4 @@
---- /dev/null	2017-03-27 15:43:35.669436670 +0300
-+++ fail-tests/fail.stdout-actual	2017-03-28 17:27:11.462899536 +0300
+--- /dev/null	2017-04-10 10:01:11.280543905 +0300
++++ fail-tests/fail.stdout-actual	2017-04-11 14:53:45.101520430 +0300
 @@ -0,0 +1 @@
 +this is not empty output to make test fail
diff --git a/yarnutils/__init__.py b/yarnutils/__init__.py
index 0a5e0c4..58f0236 100644
--- a/yarnutils/__init__.py
+++ b/yarnutils/__init__.py
@@ -17,3 +17,4 @@
 
 
 from .vars import Variables
+from .matches import get_next_match, set_env_for_matches
diff --git a/yarnutils/matches.py b/yarnutils/matches.py
new file mode 100644
index 0000000..6277618
--- /dev/null
+++ b/yarnutils/matches.py
@@ -0,0 +1,41 @@
+# Copyright 2017  Lars Wirzenius
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+# =*= License: GPL-3+ =*=
+
+
+import os
+
+
+_env = {}
+_next_match = 1
+
+
+def get_next_match():
+    global _env, _next_match
+    key = 'MATCH_{}'.format(_next_match)
+    if key not in _env:
+        raise Exception('No further matches')
+    _next_match += 1
+    return _env[key]
+
+
+def set_env_for_matches(env):
+    global _env, _next_match
+    _env = env.copy()
+    _next_match = 1
+
+
+set_env_for_matches(os.environ)  # pragma: no cover
diff --git a/yarnutils/matches_tests.py b/yarnutils/matches_tests.py
new file mode 100644
index 0000000..46b664d
--- /dev/null
+++ b/yarnutils/matches_tests.py
@@ -0,0 +1,54 @@
+# Copyright 2017  Lars Wirzenius
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+# =*= License: GPL-3+ =*=
+
+
+import unittest
+
+import yarnutils
+
+
+class GetNextMatchTests(unittest.TestCase):
+
+    def test_raises_error_if_no_matches(self):
+        yarnutils.set_env_for_matches({})
+        with self.assertRaises(Exception):
+            yarnutils.get_next_match()
+
+    def test_returns_first_match(self):
+        yarnutils.set_env_for_matches({
+            'MATCH_1': 'foo',
+        })
+        self.assertEqual(yarnutils.get_next_match(), 'foo')
+
+    def test_returns_first_two_matches(self):
+        yarnutils.set_env_for_matches({
+            'MATCH_1': 'foo',
+            'MATCH_2': 'bar',
+        })
+        self.assertEqual(yarnutils.get_next_match(), 'foo')
+        self.assertEqual(yarnutils.get_next_match(), 'bar')
+
+    def test_raises_error_after_last_match(self):
+        yarnutils.set_env_for_matches({})
+        yarnutils.set_env_for_matches({
+            'MATCH_1': 'foo',
+            'MATCH_2': 'bar',
+        })
+        yarnutils.get_next_match()
+        yarnutils.get_next_match()
+        with self.assertRaises(Exception):
+            yarnutils.get_next_match()
-- 
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