basic conversion including exchange pairs

.gitignore

@@ -1,4 +1,5 @@
 appsettings.json
+assets/exchangepairs.json
 
 # ---> VisualStudio
 ## Ignore Visual Studio temporary files, build results, and

Conversion/ConversionConfig.cs

@@ -0,0 +1,22 @@
+using System;
+using System.Collections.Generic;
+
+namespace silverworker_discord.Conversion
+{
+    public class ConversionConfig
+    {
+        public class KnownUnit
+        {
+            public string Canonical { get; set; }
+            public IEnumerable<string> Aliases { get; set; }
+        }
+        public class LinearPair
+        {
+            public string item1 { get; set; }
+            public string item2 { get; set; }
+            public decimal factor { get; set; }
+        }
+        public IEnumerable<KnownUnit> Units { get; set; }
+        public IEnumerable<LinearPair> LinearPairs { get; set; }
+    }
+}

Conversion/Converter.cs

@@ -0,0 +1,179 @@
+using System;
+using System.Text.RegularExpressions;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Net;
+using System.Text;
+using System.Threading;
+using System.Threading.Tasks;
+using Discord;
+using Discord.WebSocket;
+using Newtonsoft.Json;
+using QRCoder;
+
+namespace silverworker_discord.Conversion
+{
+    public static class Converter
+    {
+
+        private delegate decimal Convert1Way(decimal input);
+        private static string currencyPath;
+        private static ExchangePairs currencyConf = null;
+        private static DateTime lastUpdatedCurrency = DateTime.UnixEpoch;
+        private static List<Tuple<string, string, Convert1Way, Convert1Way>> knownConversions = new List<Tuple<string, string, Convert1Way, Convert1Way>>()
+        {
+            new Tuple<string, string, Convert1Way, Convert1Way>("℉", "°C", (f => {return(f- 32.0m) / 1.8m;}), (c => {return  1.8m*c + 32.0m;})),
+        };
+        private static Dictionary<List<string>, string> knownAliases = new Dictionary<List<string>, string>(new List<KeyValuePair<List<string>, string>>());
+
+        public static string convert(string message)
+        {
+            var theseMatches = Regex.Matches(message, "\\b([\\d]+\\.?\\d*) ?([^\\d\\s].*) (in|to|as) ([^\\d\\s].*)$", RegexOptions.IgnoreCase);
+
+            if (theseMatches != null && theseMatches.Count > 0 && theseMatches[0].Groups != null && theseMatches[0].Groups.Count == 5)
+            {
+                decimal asNumeric = 0;
+                if (decimal.TryParse(theseMatches[0].Groups[1].Value, out asNumeric))
+                {
+                    return actualConvert(asNumeric, theseMatches[0].Groups[2].Value, theseMatches[0].Groups[4].Value.ToLower());
+                }
+                return "mysteriously semi-parsable";
+            }
+            return "unparsable";
+        }
+
+        public static void Load(string currencyPath)
+        {
+            Converter.currencyPath = currencyPath;
+            var convConf = JsonConvert.DeserializeObject<ConversionConfig>(File.ReadAllText("assets/conversion.json"));
+            foreach (var unit in convConf.Units)
+            {
+                knownAliases.Add(unit.Aliases.ToList(), unit.Canonical);
+            }
+            foreach (var lp in convConf.LinearPairs)
+            {
+                AddLinearPair(lp.item1, lp.item2, lp.factor);
+            }
+            loadCurrency();
+        }
+        private static void loadCurrency()
+        {
+            if (File.Exists(currencyPath))
+            {
+                currencyConf = JsonConvert.DeserializeObject<ExchangePairs>(File.ReadAllText(currencyPath));
+
+                knownAliases.Add(new List<string>() { currencyConf.Base.ToLower() }, currencyConf.Base);
+                foreach (var rate in currencyConf.rates)
+                {
+                    knownAliases.Add(new List<string>() { rate.Key.ToLower() }, rate.Key);
+                    AddLinearPair(currencyConf.Base, rate.Key, rate.Value);
+                }
+            }
+        }
+
+        private static string actualConvert(decimal numericTerm, string sourceunit, string destinationUnit)
+        {
+            var normalizedSourceUnit = normalizeUnit(sourceunit);
+            if (string.IsNullOrWhiteSpace(normalizedSourceUnit))
+            {
+                return $"what's {sourceunit}?";
+            }
+            var normalizedDestUnit = normalizeUnit(destinationUnit);
+            if (string.IsNullOrWhiteSpace(normalizedDestUnit))
+            {
+                return $"what's {destinationUnit}?";
+            }
+            if (normalizedSourceUnit == normalizedDestUnit)
+            {
+                return $"source and dest are the same, so... {numericTerm} {normalizedDestUnit}?";
+            }
+            var foundPath = exhaustiveBreadthFirst(normalizedDestUnit, new List<string>() { normalizedSourceUnit })?.ToList();
+
+            if (foundPath != null)
+            {
+                var accumulator = numericTerm;
+                for (int j = 0; j < foundPath.Count - 1; j++)
+                {
+                    var forwardConversion = knownConversions.FirstOrDefault(kc => kc.Item1 == foundPath[j] && kc.Item2 == foundPath[j + 1]);
+                    if (forwardConversion != null)
+                    {
+                        accumulator = forwardConversion.Item3(accumulator);
+                    }
+                    else
+                    {
+                        var reverseConversion = knownConversions.First(kc => kc.Item2 == foundPath[j] && kc.Item1 == foundPath[j + 1]);
+                        accumulator = reverseConversion.Item4(accumulator);
+                    }
+                }
+                if (normalizedDestUnit == currencyConf.Base || currencyConf.rates.Select(r => r.Key).Contains(normalizedDestUnit))
+                {
+                    return $"{String.Format("approximately {0:0.00}", accumulator)} {normalizedDestUnit} as of {currencyConf.DateUpdated.ToLongDateString()}";
+                }
+                else
+                {
+                    return $"{String.Format("{0:0.####}", accumulator)} {normalizedDestUnit}";
+                }
+            }
+            return "no conversion known";
+        }
+        private static string normalizeUnit(string unit)
+        {
+            var normalizedUnit = unit.ToLower();
+            if (normalizedUnit.EndsWith("es"))
+            {
+                normalizedUnit = normalizedUnit.Substring(0, normalizedUnit.Length - 2);
+            }
+            else if (normalizedUnit.EndsWith('s'))
+            {
+                normalizedUnit = normalizedUnit.Substring(0, normalizedUnit.Length - 1);
+            }
+            if (knownConversions.FirstOrDefault(c => c.Item1 == normalizedUnit || c.Item2 == normalizedUnit) != null)
+            {
+                return normalizedUnit;
+            }
+            if (!knownAliases.ContainsValue(normalizedUnit))
+            {
+                var key = knownAliases.Keys.FirstOrDefault(listkey => listkey.Contains(normalizedUnit));
+                if (key != null)
+                {
+                    return knownAliases[key];
+                }
+            }
+            return null;
+        }
+        private static IEnumerable<string> exhaustiveBreadthFirst(string dest, IEnumerable<string> currentPath)
+        {
+            var last = currentPath.Last();
+            if (last == dest)
+            {
+                return currentPath;
+            }
+
+            var toTest = new List<List<string>>();
+            foreach (var conv in knownConversions)
+            {
+                if (conv.Item1 == last && currentPath.Contains(conv.Item2) == false && conv.Item3 != null)
+                {
+                    var test = exhaustiveBreadthFirst(dest, currentPath.Append(conv.Item2));
+                    if (test != null)
+                        return test;
+                }
+                if (conv.Item2 == last && currentPath.Contains(conv.Item1) == false && conv.Item4 != null)
+                {
+                    var test = exhaustiveBreadthFirst(dest, currentPath.Append(conv.Item1));
+                    if (test != null)
+                        return test;
+                }
+            }
+            return null;
+        }
+        private static void AddLinearPair(string key1, string key2, decimal factor)
+        {
+            var reverseFactor = 1.0m / factor;
+            knownConversions.Add(new Tuple<string, string, Convert1Way, Convert1Way>(
+                key1, key2, x => x * factor, y => y * reverseFactor
+            ));
+        }
+    }
+}

Conversion/ExchangePairs.cs

@@ -0,0 +1,15 @@
+using System;
+using System.Collections.Generic;
+
+namespace silverworker_discord.Conversion
+{
+    public class ExchangePairs
+    {
+        public string disclaimer{ get; set; }
+        public string license{ get; set; }
+        public int timestamp{ get; set; }
+        public DateTime DateUpdated { get { return DateTime.UnixEpoch.AddSeconds(timestamp); }}
+        public string Base{ get; set; }
+        public Dictionary<string, decimal> rates { get; set; }
+    }
+}

Features.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Text.RegularExpressions;
 using System.Collections.Generic;
 using System.IO;
 using System.Linq;
@@ -151,6 +152,10 @@ namespace silverworker_discord
                 Console.Error.WriteLine($"convert failed :( qr{todaysnumber}");
             }
         }
+        public static async void Convert(SocketUserMessage message)
+        {
+            await message.Channel.SendMessageAsync(Conversion.Converter.convert(message.Content));
+        }
         public static async void Joke(SocketUserMessage message)
         {
             var jokes = File.ReadAllLines("assets/jokes.txt");

Program.cs

@@ -47,11 +47,14 @@ namespace silverworker_discord
                 }
             }
             #endif
+            Conversion.Converter.Load(config["exchangePairsLocation"]);
 
             _client = new DiscordSocketClient();
 
             _client.Log += Log;
 
+            Console.WriteLine("token, why u null?");
+            Console.WriteLine(config["token"]);
             await _client.LoginAsync(TokenType.Bot, config["token"]);
             await _client.StartAsync();
 
@@ -200,6 +203,10 @@ namespace silverworker_discord
                     {
                         //Features.countdown(msgText.Substring("!countdown ".Length + msgText.IndexOf("!countdown ")), message); //converting human readable times is hard :/
                     }
+                    if (msgText.Contains("!freedomunits "))
+                    {
+                        Features.Convert(message);
+                    }
                     if (Regex.IsMatch(msgText, "!joke\\b"))
                     {
                         Features.Joke(message);

appsettings.example.json

@@ -1,3 +1,4 @@
 {
-    "token": "59 chars"
+    "token": "59 chars",
+    "exchangePairsLocation": "assets/exchangepairs.json"
 }

assets/conversion.json

@@ -0,0 +1,56 @@
+{
+    "units":[
+        {
+            "canonical": "f",
+            "aliases": ["degrees fahrenheit"]
+        }
+    ],
+    "linearPairs":[
+        {"item1":"kg", "item2":"g", "factor":1000},
+        {"item1":"lb", "item2":"oz", "factor":16},
+        {"item1":"kg", "item2":"lb", "factor":2.204623},
+
+        {"item1":"km", "item2":"m", "factor":1000},
+        {"item1":"mi", "item2":"ft", "factor":5280},
+        {"item1":"m", "item2":"in", "factor":39.37008},
+        {"item1":"m", "item2":"cm", "factor":100},
+        {"item1":"km", "item2":"mi", "factor":0.6213712},
+        {"item1":"ft", "item2":"in", "factor":12},
+        {"item1":"yd", "item2":"ft", "factor":3},
+        {"item1":"chain", "item2":"yd", "factor":22},
+        {"item1":"chain", "item2":"link", "factor":100},
+        {"item1":"furlong", "item2":"mi", "factor":8},
+        {"item1":"rod", "item2":"ft", "factor":16.5},
+        {"item1":"AU", "item2":"ly", "factor": 0.0000158125},
+        {"item1":"ly", "item2":"km", "factor": 946070000000},
+        {"item1":"pc", "item2":"AU", "factor":206266.3},
+
+        {"item1":"floz", "item2":"mL", "factor":29.57344},
+        {"item1":"L", "item2":"mL", "factor":1000},
+        {"item1":"L", "item2":"floz", "factor":33.81402},
+        {"item1":"hhd", "item2":"gal", "factor":54},
+        {"item1":"barrel", "item2":"kilderkin", "factor":2},
+        {"item1":"barrel", "item2":"firkin", "factor":4},
+        {"item1":"pint", "item2":"floz", "factor":16},
+        {"item1":"cup", "item2":"floz", "factor":8},
+        {"item1":"gill", "item2":"floz", "factor":4},
+        {"item1":"tbsp", "item2":"tsp", "factor":3},
+        {"item1":"tbsp", "item2":"floz", "factor":0.5},
+        {"item1":"gal", "item2":"floz", "factor":128},
+        {"item1":"gal", "item2":"qt", "factor":4},
+
+        
+        {"item1":"acre", "item2":"yd^2", "factor":4840},
+        {"item1":"yd^2", "item2":"m^2", "factor":0.836127},
+
+        {"item1":"mph", "item2":"knot", "factor":0.868976},
+        {"item1":"mph", "item2":"kph", "factor":1.609343550606653},
+
+        
+        {"item1":"kPa", "item2":"Pa", "factor":1000},
+        {"item1":"Nm^2", "item2":"Pa", "factor":1},
+        {"item1":"Pa", "item2":"bar", "factor":100},
+        {"item1":"atm", "item2":"Pa", "factor":101325},
+        {"item1":"bar", "item2":"psi", "factor":14.5038}
+    ]
+}

shtikbot-discord.csproj

@@ -16,14 +16,17 @@
   </ItemGroup>
 
   <ItemGroup>
-    <None Update="AppSettings.json">
-      <CopyToOutputDirectory>Always</CopyToOutputDirectory>
-    </None>
     <None Update="assets/jokes.txt">
       <CopyToOutputDirectory>Always</CopyToOutputDirectory>
     </None>
     <None Update="assets/coding and algorithms.png">
       <CopyToOutputDirectory>Always</CopyToOutputDirectory>
     </None>
+    <None Update="assets/ekgblip.png">
+      <CopyToOutputDirectory>Always</CopyToOutputDirectory>
+    </None>
+    <None Update="appsettings.json">
+      <CopyToOutputDirectory>Never</CopyToOutputDirectory>
+    </None>
   </ItemGroup>
 </Project>