diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 0000000..dfe0770
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1,2 @@
+# Auto detect text files and perform LF normalization
+* text=auto
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..f652b45
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,299 @@
+## Ignore Visual Studio temporary files, build results, and
+## files generated by popular Visual Studio add-ons.
+##
+## Get latest from https://github.com/github/gitignore/blob/master/VisualStudio.gitignore
+
+# User-specific files
+*.suo
+*.user
+*.userosscache
+*.sln.docstates
+
+# User-specific files (MonoDevelop/Xamarin Studio)
+*.userprefs
+
+# Build results
+[Dd]ebug/
+[Dd]ebugPublic/
+[Rr]elease/
+[Rr]eleases/
+x64/
+x86/
+bld/
+[Bb]in/
+[Oo]bj/
+[Ll]og/
+
+# Visual Studio 2015 cache/options directory
+.vs/
+# Uncomment if you have tasks that create the project's static files in wwwroot
+#wwwroot/
+
+# MSTest test Results
+[Tt]est[Rr]esult*/
+[Bb]uild[Ll]og.*
+
+# NUNIT
+*.VisualState.xml
+TestResult.xml
+
+# Build Results of an ATL Project
+[Dd]ebugPS/
+[Rr]eleasePS/
+dlldata.c
+
+# Benchmark Results
+BenchmarkDotNet.Artifacts/
+
+# .NET Core
+project.lock.json
+project.fragment.lock.json
+artifacts/
+**/Properties/launchSettings.json
+
+*_i.c
+*_p.c
+*_i.h
+*.ilk
+*.meta
+*.obj
+*.pch
+*.pdb
+*.pgc
+*.pgd
+*.rsp
+*.sbr
+*.tlb
+*.tli
+*.tlh
+*.tmp
+*.tmp_proj
+*.log
+*.vspscc
+*.vssscc
+.builds
+*.pidb
+*.svclog
+*.scc
+
+# Chutzpah Test files
+_Chutzpah*
+
+# Visual C++ cache files
+ipch/
+*.aps
+*.ncb
+*.opendb
+*.opensdf
+*.sdf
+*.cachefile
+*.VC.db
+*.VC.VC.opendb
+
+# Visual Studio profiler
+*.psess
+*.vsp
+*.vspx
+*.sap
+
+# TFS 2012 Local Workspace
+$tf/
+
+# Guidance Automation Toolkit
+*.gpState
+
+# ReSharper is a .NET coding add-in
+_ReSharper*/
+*.[Rr]e[Ss]harper
+*.DotSettings.user
+
+# JustCode is a .NET coding add-in
+.JustCode
+
+# TeamCity is a build add-in
+_TeamCity*
+
+# DotCover is a Code Coverage Tool
+*.dotCover
+
+# AxoCover is a Code Coverage Tool
+.axoCover/*
+!.axoCover/settings.json
+
+# Visual Studio code coverage results
+*.coverage
+*.coveragexml
+
+# NCrunch
+_NCrunch_*
+.*crunch*.local.xml
+nCrunchTemp_*
+
+# MightyMoose
+*.mm.*
+AutoTest.Net/
+
+# Web workbench (sass)
+.sass-cache/
+
+# Installshield output folder
+[Ee]xpress/
+
+# DocProject is a documentation generator add-in
+DocProject/buildhelp/
+DocProject/Help/*.HxT
+DocProject/Help/*.HxC
+DocProject/Help/*.hhc
+DocProject/Help/*.hhk
+DocProject/Help/*.hhp
+DocProject/Help/Html2
+DocProject/Help/html
+
+# Click-Once directory
+publish/
+
+# Publish Web Output
+*.[Pp]ublish.xml
+*.azurePubxml
+# Note: Comment the next line if you want to checkin your web deploy settings,
+# but database connection strings (with potential passwords) will be unencrypted
+*.pubxml
+*.publishproj
+
+# Microsoft Azure Web App publish settings. Comment the next line if you want to
+# checkin your Azure Web App publish settings, but sensitive information contained
+# in these scripts will be unencrypted
+PublishScripts/
+
+# NuGet Packages
+*.nupkg
+# The packages folder can be ignored because of Package Restore
+**/packages/*
+# except build/, which is used as an MSBuild target.
+!**/packages/build/
+# Uncomment if necessary however generally it will be regenerated when needed
+#!**/packages/repositories.config
+# NuGet v3's project.json files produces more ignorable files
+*.nuget.props
+*.nuget.targets
+
+# Microsoft Azure Build Output
+csx/
+*.build.csdef
+
+# Microsoft Azure Emulator
+ecf/
+rcf/
+
+# Windows Store app package directories and files
+AppPackages/
+BundleArtifacts/
+Package.StoreAssociation.xml
+_pkginfo.txt
+*.appx
+
+# Visual Studio cache files
+# files ending in .cache can be ignored
+*.[Cc]ache
+# but keep track of directories ending in .cache
+!*.[Cc]ache/
+
+# Others
+ClientBin/
+~$*
+*~
+*.dbmdl
+*.dbproj.schemaview
+*.jfm
+*.pfx
+*.publishsettings
+orleans.codegen.cs
+
+# Since there are multiple workflows, uncomment next line to ignore bower_components
+# (https://github.com/github/gitignore/pull/1529#issuecomment-104372622)
+#bower_components/
+
+# RIA/Silverlight projects
+Generated_Code/
+
+# Backup & report files from converting an old project file
+# to a newer Visual Studio version. Backup files are not needed,
+# because we have git ;-)
+_UpgradeReport_Files/
+Backup*/
+UpgradeLog*.XML
+UpgradeLog*.htm
+
+# SQL Server files
+*.mdf
+*.ldf
+*.ndf
+
+# Business Intelligence projects
+*.rdl.data
+*.bim.layout
+*.bim_*.settings
+
+# Microsoft Fakes
+FakesAssemblies/
+
+# GhostDoc plugin setting file
+*.GhostDoc.xml
+
+# Node.js Tools for Visual Studio
+.ntvs_analysis.dat
+node_modules/
+
+# Typescript v1 declaration files
+typings/
+
+# Visual Studio 6 build log
+*.plg
+
+# Visual Studio 6 workspace options file
+*.opt
+
+# Visual Studio 6 auto-generated workspace file (contains which files were open etc.)
+*.vbw
+
+# Visual Studio LightSwitch build output
+**/*.HTMLClient/GeneratedArtifacts
+**/*.DesktopClient/GeneratedArtifacts
+**/*.DesktopClient/ModelManifest.xml
+**/*.Server/GeneratedArtifacts
+**/*.Server/ModelManifest.xml
+_Pvt_Extensions
+
+# Paket dependency manager
+.paket/paket.exe
+paket-files/
+
+# FAKE - F# Make
+.fake/
+
+# JetBrains Rider
+.idea/
+*.sln.iml
+
+# CodeRush
+.cr/
+
+# Python Tools for Visual Studio (PTVS)
+__pycache__/
+*.pyc
+
+# Cake - Uncomment if you are using it
+# tools/**
+# !tools/packages.config
+
+# Tabs Studio
+*.tss
+
+# Telerik's JustMock configuration file
+*.jmconfig
+
+# BizTalk build output
+*.btp.cs
+*.btm.cs
+*.odx.cs
+*.xsd.cs
diff --git a/BenchmarkDotNet.ResultDiff.sln b/BenchmarkDotNet.ResultDiff.sln
new file mode 100644
index 0000000..09cf61a
--- /dev/null
+++ b/BenchmarkDotNet.ResultDiff.sln
@@ -0,0 +1,16 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "BenchmarkDotNet.ResultDiff", "src\BenchmarkDotNet.ResultDiff\BenchmarkDotNet.ResultDiff.csproj", "{73E99FED-64DD-4BDC-B70E-D88CD7498B8F}"
+EndProject
+Global
+ GlobalSection(SolutionConfigurationPlatforms) = preSolution
+ Debug|Any CPU = Debug|Any CPU
+ Release|Any CPU = Release|Any CPU
+ EndGlobalSection
+ GlobalSection(ProjectConfigurationPlatforms) = postSolution
+ {73E99FED-64DD-4BDC-B70E-D88CD7498B8F}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+ {73E99FED-64DD-4BDC-B70E-D88CD7498B8F}.Debug|Any CPU.Build.0 = Debug|Any CPU
+ {73E99FED-64DD-4BDC-B70E-D88CD7498B8F}.Release|Any CPU.ActiveCfg = Release|Any CPU
+ {73E99FED-64DD-4BDC-B70E-D88CD7498B8F}.Release|Any CPU.Build.0 = Release|Any CPU
+ EndGlobalSection
+EndGlobal
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..7af5a19
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,22 @@
+### The MIT License
+
+Copyright (c) 2018 Marko Lahma and contributors
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
\ No newline at end of file
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..fe225d1
--- /dev/null
+++ b/README.md
@@ -0,0 +1,90 @@
+BenchmarkDotNet.ResultDiff is a simple command line program that takes two directories as parameters
+and outputs a diff view for the BenchmarkDotNet results.
+
+The input used is the CSV result format and output is the GitHub flavored version of Markdown.
+
+Each result file comparison is added to output with heading containing the name of benchmark (file name).
+
+See [this PR for Jint](https://github.com/sebastienros/jint/pull/495) for an example how output file contents can be easily pasted to PRs.
+
+## Usage
+
+General workflow that works at least for me
+
+* Run your benchmark on original branch
+* Rename the result directory BenchmarkDotNet.Artifacts to for example BenchmarkDotNet.Artifacts_original
+* Switch to your optimization branch
+* Run benchmarks again
+* Run this tool and paths as parameters (BenchmarkDotNet.Artifacts_original BenchmarkDotNet.Artifacts)
+
+`
+cd C:\Sources\BenchmarkDotNet.ResultDiff\src\BenchmarkDotNet.ResultDiff
+`
+
+`
+dotnet run ..\jint\Jint.Benchmark\BenchmarkDotNet.Artifacts_dev ..\jint\Jint.Benchmark\BenchmarkDotNet.Artifacts_my_feature
+`
+
+`
+Analyzing pair ArrayBenchmark-report.csv
+Wrote results to C:\BenchmarkDotNet.ResultDiff\BenchmarkDotNet.Artifacts_dev_vs_BenchmarkDotNet.Artifacts-github.md
+`
+
+## BenchmarkDotNet input
+
+The tool turns these two results tables (taken from markdown output, tool actually uses CSV):
+
+*BenchmarkDotNet.Artifacts_dev\results*
+
+| Method | N | Mean | Error | StdDev | Gen 0 | Allocated |
+|------------------- |---- |------------:|-----------:|-----------:|----------:|------------:|
+| Slice | 100 | 436.2 us | 0.7824 us | 0.6936 us | 161.1328 | 660.16 KB |
+| Concat | 100 | 468.4 us | 1.0230 us | 0.9569 us | 175.7813 | 720.31 KB |
+| Unshift | 100 | 17,912.2 us | 29.0475 us | 24.2560 us | 3562.5000 | 14672.66 KB |
+| Push | 100 | 10,861.8 us | 17.9719 us | 16.8109 us | 343.7500 | 1438.28 KB |
+| Index | 100 | 12,106.5 us | 7.0282 us | 6.5742 us | 390.6250 | 1637.5 KB |
+| Map | 100 | 3,382.7 us | 13.8354 us | 12.9416 us | 765.6250 | 3149.22 KB |
+| Apply | 100 | 569.2 us | 1.1511 us | 1.0767 us | 188.4766 | 774.22 KB |
+| JsonStringifyParse | 100 | 4,523.7 us | 6.5277 us | 6.1060 us | 1273.4375 | 5225 KB |
+
+*BenchmarkDotNet.Artifacts_my_feature\results*
+
+
+| Method | N | Mean | Error | StdDev | Gen 0 | Allocated |
+|------------------- |---- |------------:|-----------:|----------:|----------:|------------:|
+| Slice | 100 | 455.8 us | 3.482 us | 3.086 us | 161.1328 | 660.16 KB |
+| Concat | 100 | 496.6 us | 9.547 us | 10.611 us | 175.7813 | 720.31 KB |
+| Unshift | 100 | 19,023.0 us | 103.525 us | 96.838 us | 3562.5000 | 14672.66 KB |
+| Push | 100 | 11,274.1 us | 31.569 us | 29.530 us | 343.7500 | 1438.28 KB |
+| Index | 100 | 12,471.8 us | 33.521 us | 29.716 us | 390.6250 | 1643.75 KB |
+| Map | 100 | 3,624.8 us | 31.269 us | 29.249 us | 691.4063 | 2833.59 KB |
+| Apply | 100 | 600.3 us | 6.965 us | 6.515 us | 188.4766 | 774.22 KB |
+| JsonStringifyParse | 100 | 4,602.2 us | 49.303 us | 43.706 us | 1273.4375 | 5225.78 KB |
+
+
+## Output
+
+Output for each file single result table that allows easier examination of differences between the results:
+
+*BenchmarkDotNet.Artifacts_dev_vs_BenchmarkDotNet.Artifacts_my_feature-github.md*
+
+## ArrayBenchmark
+
+| **Diff**|Method|N|Mean|Gen 0|Allocated|
+|------- |-------|-------|-------:|-------:|-------:|
+| Old |Slice|100|436.2 us|161.1328|660.16 KB|
+| **New** | | | **455.8 us (+4%)** | **161.1328 (0%)** | **660.16 KB (0%)** |
+| Old |Concat|100|468.4 us|175.7813|720.31 KB|
+| **New** | | | **496.6 us (+6%)** | **175.7813 (0%)** | **720.31 KB (0%)** |
+| Old |Unshift|100|17,912.2 us|3562.5000|14672.66 KB|
+| **New** | | | **19,023.0 us (+6%)** | **3562.5000 (0%)** | **14672.66 KB (0%)** |
+| Old |Push|100|10,861.8 us|343.7500|1438.28 KB|
+| **New** | | | **11,274.1 us (+4%)** | **343.7500 (0%)** | **1438.28 KB (0%)** |
+| Old |Index|100|12,106.5 us|390.6250|1637.5 KB|
+| **New** | | | **12,471.8 us (+3%)** | **390.6250 (0%)** | **1643.75 KB (0%)** |
+| Old |Map|100|3,382.7 us|765.6250|3149.22 KB|
+| **New** | | | **3,624.8 us (+7%)** | **691.4063 (-10%)** | **2833.59 KB (-10%)** |
+| Old |Apply|100|569.2 us|188.4766|774.22 KB|
+| **New** | | | **600.3 us (+5%)** | **188.4766 (0%)** | **774.22 KB (0%)** |
+| Old |JsonStringifyParse|100|4,523.7 us|1273.4375|5225 KB|
+| **New** | | | **4,602.2 us (+2%)** | **1273.4375 (0%)** | **5225.78 KB (0%)** |
\ No newline at end of file
diff --git a/src/BenchmarkDotNet.ResultDiff/BenchmarkDotNet.ResultDiff.csproj b/src/BenchmarkDotNet.ResultDiff/BenchmarkDotNet.ResultDiff.csproj
new file mode 100644
index 0000000..6b2fbad
--- /dev/null
+++ b/src/BenchmarkDotNet.ResultDiff/BenchmarkDotNet.ResultDiff.csproj
@@ -0,0 +1,8 @@
+
+
+
+ Exe
+ netcoreapp2.0
+
+
+
diff --git a/src/BenchmarkDotNet.ResultDiff/Program.cs b/src/BenchmarkDotNet.ResultDiff/Program.cs
new file mode 100644
index 0000000..08d8886
--- /dev/null
+++ b/src/BenchmarkDotNet.ResultDiff/Program.cs
@@ -0,0 +1,264 @@
+using System;
+using System.Collections.Generic;
+using System.Globalization;
+using System.IO;
+using System.Linq;
+
+namespace BenchmarkDotNet.ResultDiff
+{
+ ///
+ /// Reads BenchmarkDotNet CSV format results from two directories and creates a rudimentary diff view.
+ ///
+ public static class Program
+ {
+ static void Main(string[] args)
+ {
+ if (args.Length < 2)
+ {
+ Console.Error.WriteLine("syntax: [target dir to save files to]");
+ return;
+ }
+
+ string targetDir = Directory.GetCurrentDirectory();
+ if (args.Length == 3)
+ {
+ targetDir = args[2];
+ }
+
+ var oldDir = FindDirectory(args[0]);
+ var newDir = FindDirectory(args[1]);
+
+ var pairs = CreateFilePairs(oldDir, newDir);
+
+ var columns = new List
+ {
+ "Method",
+ "FileName",
+ "N",
+ "Mean",
+ "Gen 0",
+ "Gen 1",
+ "Gen 2",
+ "Allocated"
+ };
+
+ var oldDirName = oldDir.Name != newDir.Name ? oldDir.Name : oldDir.Parent.Name;
+ var newDirName = newDir.Name != oldDir.Name ? newDir.Name : newDir.Parent.Name;
+ var targetFile = Path.Combine(targetDir, oldDirName + "_vs_" + newDirName + "-github.md");
+ using (var writer = new StreamWriter(targetFile))
+ {
+ foreach (var pair in pairs)
+ {
+ writer.WriteLine("## " + pair.OldFile.Name.Replace("-report.csv", ""));
+ writer.WriteLine();
+
+ Console.WriteLine("Analyzing pair " + pair.OldFile.Name);
+
+ using (var oldReader = new StreamReader(pair.OldFile.FullName))
+ using (var newReader = new StreamReader(pair.NewFile.FullName))
+ {
+ ReadLinePair(oldReader, newReader, out var headers);
+ var oldHeaders = headers.Old.Split(";").Select((x, i) => (x, i)).ToDictionary(x => x.Item1, x => x.Item2);
+ var newHeaders = headers.New.Split(";").Select((x, i) => (x, i)).ToDictionary(x => x.Item1, x => x.Item2);
+
+ var readLines = new List<(string Old, string New)>();
+ while (ReadLinePair(oldReader, newReader, out var lines))
+ {
+ if (string.IsNullOrEmpty(lines.Old))
+ {
+ break;
+ }
+
+ readLines.Add(lines);
+ }
+
+ var effectiveHeaders = columns
+ .Where(x => oldHeaders.ContainsKey(x) || newHeaders.ContainsKey(x))
+ .ToList();
+
+ writer.WriteLine("| **Diff**|" + string.Join("|", effectiveHeaders) + "|");
+
+ writer.Write("|------- ");
+ foreach (var effectiveHeader in effectiveHeaders)
+ {
+ writer.Write("|-------");
+ if (effectiveHeader.IndexOf("Gen ") > -1 || effectiveHeader == "Allocated" || effectiveHeader == "Mean")
+ {
+ writer.Write(":");
+ }
+ }
+
+ writer.WriteLine("|");
+
+ foreach (var lines in readLines)
+ {
+ if (string.IsNullOrEmpty(lines.Old))
+ {
+ break;
+ }
+
+ var oldie = lines.Old.Split(";");
+ var newbie = lines.New.Split(";");
+
+ var oldColumnValues = new Dictionary();
+
+ writer.Write("| Old |");
+ foreach (var effectiveHeader in effectiveHeaders)
+ {
+ string value = "-";
+ if (oldHeaders.TryGetValue(effectiveHeader, out var oldHeader))
+ {
+ value = oldie[oldHeader].TrimStart('"').TrimEnd('"');
+ }
+ oldColumnValues[effectiveHeader] = value;
+ writer.Write(value + "|");
+ }
+
+ writer.WriteLine();
+
+ writer.Write("| **New** |");
+ foreach (var effectiveHeader in effectiveHeaders)
+ {
+ if (effectiveHeader == "Method" || effectiveHeader == "N" || effectiveHeader == "FileName")
+ {
+ writer.Write("\t|");
+ }
+ else
+ {
+ string value = "-";
+ if (newHeaders.ContainsKey(effectiveHeader))
+ {
+ value = newbie[newHeaders[effectiveHeader]].TrimStart('"').TrimEnd('"');
+ }
+
+ if (oldColumnValues.TryGetValue(effectiveHeader, out var oldString))
+ {
+ var oldTokens = oldString.Split(" ");
+ var newTokens = value.Split(" ");
+
+ if (oldTokens.Length == newTokens.Length)
+ {
+ bool canCalculateDiff = oldTokens[0] != "-" && newTokens[0] != "-";
+
+ decimal newMultiplier = 1;
+
+ if (canCalculateDiff && oldTokens.Length > 1)
+ {
+ var oldUnit = oldTokens[1];
+ var newUnit = newTokens[1];
+ if (oldUnit == newUnit)
+ {
+ // ok
+ }
+ else if (oldUnit == "MB" && newUnit == "KB"
+ || oldUnit == "GB" && newUnit == "MB"
+ || oldUnit == "s" && newUnit == "ms"
+ || oldUnit == "ms" && newUnit == "us")
+ {
+ newMultiplier = 0.001M;
+ }
+ else
+ {
+ canCalculateDiff = false;
+ }
+ }
+
+ if (canCalculateDiff)
+ {
+ var old = decimal.Parse(oldTokens[0], CultureInfo.InvariantCulture);
+ var newValue = decimal.Parse(newTokens[0], CultureInfo.InvariantCulture);
+
+ var diff = ((newValue * newMultiplier) / old - 1) * 100;
+ value += $" ({diff:+#;-#;0}%)";
+ }
+ else if (oldTokens[0] == "-" || newTokens[0] == "-")
+ {
+ // OK
+ }
+ else
+ {
+ Console.Error.WriteLine("Cannot calculate difff for " + oldString + " vs " + value);
+ }
+ }
+ }
+
+ writer.Write(" **" + value + "** |");
+ }
+ }
+
+ writer.WriteLine();
+ }
+ }
+
+ writer.WriteLine();
+ writer.WriteLine();
+ }
+
+ Console.WriteLine("Wrote results to " + targetFile);
+ }
+ }
+
+ private static List<(FileInfo OldFile, FileInfo NewFile)> CreateFilePairs(DirectoryInfo oldDir, DirectoryInfo newDir)
+ {
+ var pairs = new List<(FileInfo OldFile, FileInfo NewFile)>();
+ foreach (var oldReportFile in oldDir.GetFiles("*-report.csv"))
+ {
+ var fileName = oldReportFile.Name;
+ var newReportFile = new FileInfo(Path.Combine(newDir.FullName, fileName));
+ if (newReportFile.Exists)
+ {
+ pairs.Add((oldReportFile, newReportFile));
+ }
+ else
+ {
+ // check if new file name format without namespace
+ var tokens = fileName.Split('.');
+ if (tokens.Length > 1)
+ {
+ fileName = tokens[tokens.Length - 2] + "." + tokens[tokens.Length - 1];
+ newReportFile = new FileInfo(Path.Combine(newDir.FullName, fileName));
+ if (newReportFile.Exists)
+ {
+ pairs.Add((oldReportFile, newReportFile));
+ }
+ }
+ }
+ }
+
+ return pairs;
+ }
+
+ private static DirectoryInfo FindDirectory(string path)
+ {
+ var dir = new DirectoryInfo(path);
+ if (!dir.Exists)
+ {
+ Console.Error.WriteLine("directory does not exist: " + path);
+ }
+
+ if (dir.GetFiles("*.csv").Length == 0)
+ {
+ var resultsDirectory = dir.GetDirectories().FirstOrDefault(x => x.Name == "results");
+ if (resultsDirectory != null)
+ {
+ dir = resultsDirectory;
+ }
+ }
+
+ return dir;
+ }
+
+ private static bool ReadLinePair(
+ TextReader oldReader,
+ TextReader newReader,
+ out (string Old, string New) pair)
+ {
+ string oldLine;
+ string newLine;
+ var ok = (oldLine = oldReader.ReadLine()) != null;
+ ok &= (newLine = newReader.ReadLine()) != null;
+ pair = (oldLine, newLine);
+ return ok;
+ }
+ }
+}
\ No newline at end of file