Extract analyze-baselines command out of rebaseline.py.

third_party/WebKit/Tools/Scripts/webkitpy/tool/commands/analyze_baselines.py

Index: third_party/WebKit/Tools/Scripts/webkitpy/tool/commands/analyze_baselines.py
diff --git a/third_party/WebKit/Tools/Scripts/webkitpy/tool/commands/analyze_baselines.py b/third_party/WebKit/Tools/Scripts/webkitpy/tool/commands/analyze_baselines.py
new file mode 100644
index 0000000000000000000000000000000000000000..eb62df2cbaf33343611174bf03e48110ecfda1f2
--- /dev/null
+++ b/third_party/WebKit/Tools/Scripts/webkitpy/tool/commands/analyze_baselines.py
@@ -0,0 +1,82 @@
+# Copyright (c) 2016 Google Inc. All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR/ OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+import logging
+import optparse
+
+from webkitpy.common.checkout.baselineoptimizer import BaselineOptimizer
+from webkitpy.layout_tests.controllers.test_result_writer import TestResultWriter
+from webkitpy.tool.commands.rebaseline import AbstractRebaseliningCommand
+
+
+_log = logging.getLogger(__name__)
+
+
+# FIXME: Should TestResultWriter know how to compute this string?
+def _baseline_name(fs, test_name, suffix):
+    return fs.splitext(test_name)[0] + TestResultWriter.FILENAME_SUFFIX_EXPECTED + "." + suffix
+
+
+class AnalyzeBaselines(AbstractRebaseliningCommand):
+    name = "analyze-baselines"
+    help_text = "Analyzes the baselines for the given tests and prints results that are identical."
+    show_in_main_help = True
+    argument_names = "TEST_NAMES"
+
+    def __init__(self):
+        super(AnalyzeBaselines, self).__init__(options=[
+            self.suffixes_option,
+            optparse.make_option('--missing', action='store_true', default=False, help='Show missing baselines as well.'),
+        ] + self.platform_options)
+        self._optimizer_class = BaselineOptimizer  # overridable for testing
+        self._baseline_optimizer = None
+        self._port = None
+
+    def _write(self, msg):
+        print msg  # pylint: disable=print-statement
+
+    def _analyze_baseline(self, options, test_name):
+        for suffix in self._baseline_suffix_list:
+            baseline_name = _baseline_name(self._tool.filesystem, test_name, suffix)
+            results_by_directory = self._baseline_optimizer.read_results_by_directory(baseline_name)
+            if results_by_directory:
+                self._write("%s:" % baseline_name)
+                self._baseline_optimizer.write_by_directory(results_by_directory, self._write, "  ")
+            elif options.missing:
+                self._write("%s: (no baselines found)" % baseline_name)
+
+    def execute(self, options, args, tool):
+        self._baseline_suffix_list = options.suffixes.split(',')
+        port_names = tool.port_factory.all_port_names(options.platform)
+        if not port_names:
+            _log.error("No port names match '%s'" % options.platform)
+            return
+        self._port = tool.port_factory.get(port_names[0])
+        self._baseline_optimizer = self._optimizer_class(tool, self._port, port_names, skip_scm_commands=False)
+        for test_name in self._port.tests(args):
+            self._analyze_baseline(options, test_name)