commit 42eb1f7726cefcec9d5c5c9d55f9c9a9836b6723
Author: Smaug123 <patrick+github@patrickstevens.co.uk>
Date:   Wed Oct 11 00:17:48 2023 +0100

    Initial commit

diff --git a/.config/dotnet-tools.json b/.config/dotnet-tools.json
new file mode 100644
index 0000000..2a80148
--- /dev/null
+++ b/.config/dotnet-tools.json
@@ -0,0 +1,12 @@
+{
+  "version": 1,
+  "isRoot": true,
+  "tools": {
+    "fantomas": {
+      "version": "6.2.0",
+      "commands": [
+        "fantomas"
+      ]
+    }
+  }
+}
diff --git a/.editorconfig b/.editorconfig
new file mode 100644
index 0000000..9ef5fed
--- /dev/null
+++ b/.editorconfig
@@ -0,0 +1,41 @@
+root=true
+
+[*]
+charset=utf-8
+end_of_line=crlf
+trim_trailing_whitespace=true
+insert_final_newline=true
+indent_style=space
+indent_size=4
+
+# ReSharper properties
+resharper_xml_indent_size=2
+resharper_xml_max_line_length=100
+resharper_xml_tab_width=2
+
+[*.{csproj,fsproj,sqlproj,targets,props,ts,tsx,css,json}]
+indent_style=space
+indent_size=2
+
+[*.{fs,fsi}]
+fsharp_bar_before_discriminated_union_declaration=true
+fsharp_space_before_uppercase_invocation=true
+fsharp_space_before_class_constructor=true
+fsharp_space_before_member=true
+fsharp_space_before_colon=true
+fsharp_space_before_semicolon=true
+fsharp_multiline_bracket_style=aligned
+fsharp_newline_between_type_definition_and_members=true
+fsharp_align_function_signature_to_indentation=true
+fsharp_alternative_long_member_definitions=true
+fsharp_multi_line_lambda_closing_newline=true
+fsharp_experimental_keep_indent_in_branch=true
+fsharp_max_value_binding_width=80
+fsharp_max_record_width=0
+max_line_length=120
+end_of_line=lf
+
+[*.{appxmanifest,build,dtd,nuspec,xaml,xamlx,xoml,xsd}]
+indent_style=space
+indent_size=2
+tab_width=2
diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 0000000..f32682c
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1,4 @@
+* eol=auto
+*.sh text eol=lf
+*.nix text eol=lf
+hooks/pre-push text eol=lf
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..4a10cb9
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,15 @@
+bin/
+obj/
+/packages/
+riderModule.iml
+/_ReSharper.Caches/
+.idea/
+*.user
+*.DotSettings
+.DS_Store
+result
+.profile*
+
+node_modules/
+package.json
+package-lock.json
diff --git a/.woodpecker/.all-checks-complete.yml b/.woodpecker/.all-checks-complete.yml
new file mode 100644
index 0000000..5a7fdd7
--- /dev/null
+++ b/.woodpecker/.all-checks-complete.yml
@@ -0,0 +1,10 @@
+steps:
+  echo:
+    image: alpine
+    commands:
+      - echo "All required checks complete"
+
+depends_on:
+  - build
+
+skip_clone: true
diff --git a/.woodpecker/.build.yml b/.woodpecker/.build.yml
new file mode 100644
index 0000000..0983b09
--- /dev/null
+++ b/.woodpecker/.build.yml
@@ -0,0 +1,22 @@
+steps:
+  build:
+    image: nixos/nix
+    commands:
+      - echo 'experimental-features = flakes nix-command' >> /etc/nix/nix.conf
+      # Lint
+      - "nix flake check"
+      # Test
+      - nix build
+      - nix run . -- --help
+      - nix run . -- auth --help
+      - nix run . -- lookup-gym --help
+      - nix run . -- fullness --help
+      - nix run . -- activity --help
+      - nix develop --command markdown-link-check README.md
+      - nix develop --command dotnet test
+      - nix develop --command dotnet test --configuration Release
+
+    when:
+      - event: "push"
+        evaluate: 'CI_COMMIT_BRANCH == CI_REPO_DEFAULT_BRANCH'
+      - event: "pull_request"
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..e1d31cd
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2023 Patrick Stevens
+
+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.
diff --git a/PureGym.App/ArgsCrate.fs b/PureGym.App/ArgsCrate.fs
new file mode 100644
index 0000000..51aace5
--- /dev/null
+++ b/PureGym.App/ArgsCrate.fs
@@ -0,0 +1,21 @@
+namespace PureGym.App
+
+open System.Threading.Tasks
+open Argu
+
+type ArgsEvaluator<'ret> =
+    abstract Eval<'a, 'b when 'b :> IArgParserTemplate> :
+        (ParseResults<'b> -> Result<'a, ArguParseException>) -> ('a -> Task<int>) -> 'ret
+
+type ArgsCrate =
+    abstract Apply<'ret> : ArgsEvaluator<'ret> -> 'ret
+
+[<RequireQualifiedAccess>]
+module ArgsCrate =
+    let make<'a, 'b when 'b :> IArgParserTemplate>
+        (ofResult : ParseResults<'b> -> Result<'a, ArguParseException>)
+        (run : 'a -> Task<int>)
+        =
+        { new ArgsCrate with
+            member _.Apply e = e.Eval ofResult run
+        }
diff --git a/PureGym.App/AuthArg.fs b/PureGym.App/AuthArg.fs
new file mode 100644
index 0000000..0ca15ec
--- /dev/null
+++ b/PureGym.App/AuthArg.fs
@@ -0,0 +1,41 @@
+namespace PureGym.App
+
+open Argu
+open PureGym
+
+type AuthArg =
+    | [<Unique ; CustomAppSettings "PUREGYM_BEARER_TOKEN">] Bearer_Token of string
+    | [<Unique>] User_Email of string
+    | [<Unique>] Pin of string
+    | [<GatherUnrecognized>] Others of string
+
+    interface IArgParserTemplate with
+        member s.Usage =
+            match s with
+            | AuthArg.Bearer_Token _ -> "A bearer token for the PureGym API"
+            | AuthArg.User_Email _ -> "PureGym user's email address"
+            | AuthArg.Pin _ -> "Eight-digit PureGym user's PIN"
+            | AuthArg.Others _ -> "<specific args for command>"
+
+    static member Parse (args : ParseResults<AuthArg>) : Result<Auth * string[], ArguParseException> =
+        let unmatchedArgs = args.GetResults AuthArg.Others |> List.toArray
+
+        match
+            args.TryGetResult AuthArg.User_Email, args.TryGetResult AuthArg.Pin, args.TryGetResult AuthArg.Bearer_Token
+        with
+        | Some email, Some pin, _ ->
+            let auth =
+                Auth.User
+                    {
+                        Username = email
+                        Pin = pin
+                    }
+
+            Ok (auth, unmatchedArgs)
+        | Some _email, None, _ -> failwith "Supplied --user-email but no --pin; either both or neither are required."
+        | None, Some _pin, _ -> failwith "Supplied --pin but no --user-email; either both or neither are required."
+        | None, None, None ->
+            failwith "No creds given: expected at least one of `--bearer-token` or `--user-email --pin`"
+        | None, None, Some token ->
+            let auth = Auth.Token (AuthToken.ofBearerToken token)
+            Ok (auth, unmatchedArgs)
diff --git a/PureGym.App/Authenticate.fs b/PureGym.App/Authenticate.fs
new file mode 100644
index 0000000..ff0084a
--- /dev/null
+++ b/PureGym.App/Authenticate.fs
@@ -0,0 +1,40 @@
+namespace PureGym.App
+
+open Argu
+open System
+open PureGym
+
+type GetTokenArg =
+    | [<ExactlyOnce>] User_Email of string
+    | [<ExactlyOnce>] Pin of string
+
+    interface IArgParserTemplate with
+        member s.Usage =
+            match s with
+            | GetTokenArg.Pin _ -> "Eight-digit PureGym user's PIN"
+            | GetTokenArg.User_Email _ -> "PureGym user's email address"
+
+    static member Parse (args : ParseResults<GetTokenArg>) : Result<UsernamePin, ArguParseException> =
+        try
+            {
+                Username = args.GetResult GetTokenArg.User_Email
+                Pin = args.GetResult GetTokenArg.Pin
+            }
+            |> Ok
+        with :? ArguParseException as e ->
+            Error e
+
+[<RequireQualifiedAccess>]
+module Authenticate =
+
+    let run (creds : UsernamePin) =
+        task {
+            let! cred = AuthToken.get creds
+            Console.WriteLine cred.AccessToken
+
+            match cred.ExpiryTime with
+            | None -> ()
+            | Some expiry -> Console.Error.WriteLine $"Expires at {expiry}"
+
+            return 0
+        }
diff --git a/PureGym.App/Exception.fs b/PureGym.App/Exception.fs
new file mode 100644
index 0000000..dd6f16b
--- /dev/null
+++ b/PureGym.App/Exception.fs
@@ -0,0 +1,11 @@
+namespace PureGym.App
+
+open System.Runtime.ExceptionServices
+
+[<RequireQualifiedAccess>]
+module Exception =
+
+    let reraiseWithOriginalStackTrace<'a> (e : exn) : 'a =
+        let edi = ExceptionDispatchInfo.Capture e
+        edi.Throw ()
+        failwith "unreachable"
diff --git a/PureGym.App/Fullness.fs b/PureGym.App/Fullness.fs
new file mode 100644
index 0000000..c303910
--- /dev/null
+++ b/PureGym.App/Fullness.fs
@@ -0,0 +1,61 @@
+namespace PureGym.App
+
+open Argu
+open PureGym
+
+type FullnessArgsFragment =
+    | [<Unique>] Gym_Id of int
+    | [<Unique>] Gym_Name of string
+    | [<Unique>] Terse of bool
+
+    interface IArgParserTemplate with
+        member s.Usage =
+            match s with
+            | FullnessArgsFragment.Gym_Id _ -> "ID of the gym to look up, according to PureGym's internal mapping"
+            | FullnessArgsFragment.Gym_Name _ -> "Name of a gym (best-guess fuzzy matching)"
+            | FullnessArgsFragment.Terse _ -> "If true, output only the single number 'how many people are in the gym'."
+
+type FullnessArgs =
+    {
+        Creds : Auth
+        Gym : GymSelector
+        Terse : bool
+    }
+
+    static member Parse
+        (auth : Auth)
+        (args : FullnessArgsFragment ParseResults)
+        : Result<FullnessArgs, ArguParseException>
+        =
+        let gym =
+            match args.TryGetResult FullnessArgsFragment.Gym_Id, args.TryGetResult FullnessArgsFragment.Gym_Name with
+            | Some _, Some _ -> failwith "--gym-id and --gym-name are mutually exclusive"
+            | None, None ->
+                System.Console.Error.WriteLine "No gym ID given and no gym named; assuming the user's home gym"
+                GymSelector.Home
+            | Some id, None -> GymSelector.Id id
+            | None, Some name -> GymSelector.Name name
+
+        {
+            Creds = auth
+            Gym = gym
+            Terse = args.TryGetResult FullnessArgsFragment.Terse |> Option.defaultValue false
+        }
+        |> Ok
+
+[<RequireQualifiedAccess>]
+module Fullness =
+
+    let run (args : FullnessArgs) =
+        task {
+            let! client = Api.make args.Creds
+            let! id = GymSelector.canonicalId client args.Gym
+            let! attendance = client.GetGymAttendance id
+
+            if args.Terse then
+                System.Console.WriteLine attendance.TotalPeopleInGym
+            else
+                System.Console.WriteLine (string<GymAttendance> attendance)
+
+            return 0
+        }
diff --git a/PureGym.App/LookupGym.fs b/PureGym.App/LookupGym.fs
new file mode 100644
index 0000000..8803e4e
--- /dev/null
+++ b/PureGym.App/LookupGym.fs
@@ -0,0 +1,51 @@
+namespace PureGym.App
+
+open Argu
+open PureGym
+
+type LookupGymArgsFragment =
+    | [<Unique>] Gym_Id of int
+    | [<Unique>] Gym_Name of string
+
+    interface IArgParserTemplate with
+        member s.Usage =
+            match s with
+            | LookupGymArgsFragment.Gym_Id _ -> "ID of the gym to look up, according to PureGym's internal mapping"
+            | LookupGymArgsFragment.Gym_Name _ -> "Name of a gym (best-guess fuzzy matching)"
+
+type LookupGymArgs =
+    {
+        Creds : Auth
+        Gym : GymSelector
+    }
+
+    static member Parse
+        (auth : Auth)
+        (args : LookupGymArgsFragment ParseResults)
+        : Result<LookupGymArgs, ArguParseException>
+        =
+        let gym =
+            match args.TryGetResult LookupGymArgsFragment.Gym_Id, args.TryGetResult LookupGymArgsFragment.Gym_Name with
+            | Some _, Some _ -> failwith "--gym-id and --gym-name are mutually exclusive"
+            | None, None ->
+                System.Console.Error.WriteLine "No gym ID given and no gym named; assuming the user's home gym"
+                GymSelector.Home
+            | Some id, None -> GymSelector.Id id
+            | None, Some name -> GymSelector.Name name
+
+        {
+            Creds = auth
+            Gym = gym
+        }
+        |> Ok
+
+[<RequireQualifiedAccess>]
+module LookupGym =
+
+    let run (args : LookupGymArgs) =
+        task {
+            let! client = Api.make args.Creds
+            let! s = client.GetGym 19
+            System.Console.WriteLine (string<Gym> s)
+            return 0
+        }
diff --git a/PureGym.App/MemberActivity.fs b/PureGym.App/MemberActivity.fs
new file mode 100644
index 0000000..9c079b0
--- /dev/null
+++ b/PureGym.App/MemberActivity.fs
@@ -0,0 +1,38 @@
+namespace PureGym.App
+
+open Argu
+open PureGym
+
+type MemberActivityArgsFragment =
+    | MemberActivityArgsFragment of bool
+
+    interface IArgParserTemplate with
+        member s.Usage =
+            match s with
+            | MemberActivityArgsFragment _ -> "dummy argument: this subcommand has no args"
+
+type MemberActivityArgs =
+    {
+        Creds : Auth
+    }
+
+    static member Parse
+        (auth : Auth)
+        (_ : MemberActivityArgsFragment ParseResults)
+        : Result<MemberActivityArgs, ArguParseException>
+        =
+        {
+            Creds = auth
+        }
+        |> Ok
+
+[<RequireQualifiedAccess>]
+module MemberActivity =
+
+    let run (args : MemberActivityArgs) =
+        task {
+            let! client = Api.make args.Creds
+            let! activity = client.GetMemberActivity ()
+            System.Console.WriteLine (string<MemberActivity> activity)
+            return 0
+        }
diff --git a/PureGym.App/Program.fs b/PureGym.App/Program.fs
new file mode 100644
index 0000000..7443d71
--- /dev/null
+++ b/PureGym.App/Program.fs
@@ -0,0 +1,118 @@
+namespace PureGym.App
+
+open System
+open Argu
+
+type Subcommand =
+    | RequiresAuth of (PureGym.Auth -> ArgsCrate)
+    | NoAuth of ArgsCrate
+
+module Program =
+    let subcommands =
+        [|
+            "auth", ("Get an authentication token", NoAuth (ArgsCrate.make GetTokenArg.Parse Authenticate.run))
+
+            "lookup-gym",
+            ("Get information about the physical instantiation of a gym",
+             RequiresAuth (fun auth -> ArgsCrate.make (LookupGymArgs.Parse auth) LookupGym.run))
+
+            "fullness",
+            ("Determine how full a gym is",
+             RequiresAuth (fun auth -> ArgsCrate.make (FullnessArgs.Parse auth) Fullness.run))
+
+            "activity",
+            ("Get information about your gym usage",
+             RequiresAuth (fun auth -> ArgsCrate.make (MemberActivityArgs.Parse auth) MemberActivity.run))
+        |]
+        |> Map.ofArray
+
+    [<EntryPoint>]
+    let main argv =
+        // It looks like Argu doesn't really support the combination of subcommands and read-from-env-vars, so we just
+        // roll our own.
+
+        match Array.tryHead argv with
+        | None
+        | Some "--help" ->
+            subcommands.Keys
+            |> String.concat ","
+            |> eprintfn "Subcommands (try each with `--help`): %s"
+
+            0
+
+        | Some commandName ->
+
+        match Map.tryFind commandName subcommands with
+        | None ->
+            subcommands.Keys
+            |> String.concat ","
+            |> eprintfn "Unrecognised command '%s'. Subcommands (try each with `--help`): %s" commandName
+
+            127
+
+        | Some (_help, command) ->
+
+        let argv = Array.tail argv
+        let config = ConfigurationReader.FromEnvironmentVariables ()
+
+        let argv, command =
+            match command with
+            | RequiresAuth command ->
+                let authParser = ArgumentParser.Create<AuthArg> ()
+
+                let extractedAuthParse, helpRequested =
+                    try
+                        authParser.Parse (argv, config, raiseOnUsage = true, ignoreUnrecognized = true), false
+                    with :? ArguParseException as e ->
+                        if e.Message.StartsWith ("USAGE:", StringComparison.OrdinalIgnoreCase) then
+                            authParser.Parse (argv, config, raiseOnUsage = false, ignoreUnrecognized = true), true
+                        else
+                            reraise ()
+
+                let authArgs, argv =
+                    if helpRequested then
+                        let subcommandArgs =
+                            ("--help" :: extractedAuthParse.GetResults AuthArg.Others) |> List.toArray
+
+                        Unchecked.defaultof<_>, subcommandArgs
+                    else
+                        match AuthArg.Parse extractedAuthParse with
+                        | Ok a -> a
+                        | Error e -> Exception.reraiseWithOriginalStackTrace e
+
+                argv, command authArgs
+            | NoAuth command -> argv, command
+
+        { new ArgsEvaluator<_> with
+            member _.Eval<'a, 'b when 'b :> IArgParserTemplate> (ofResult : ParseResults<'b> -> Result<'a, _>) run =
+                let parser = ArgumentParser.Create<'b> ()
+
+                let parsed =
+                    try
+                        parser.Parse (argv, config, raiseOnUsage = true) |> Ok
+                    with :? ArguParseException as e ->
+                        e.Message.Replace ("PureGym.App ", $"PureGym.App %s{commandName} ")
+                        |> Console.Error.WriteLine
+
+                        if e.Message.StartsWith ("USAGE:", StringComparison.OrdinalIgnoreCase) then
+                            Error true
+                        else
+                            Error false
+
+                match parsed with
+                | Error false -> Error 127
+                | Error true -> Error 0
+                | Ok parsed ->
+
+                match ofResult parsed with
+                | Error e ->
+                    e.Message.Replace ("PureGym.App ", $"PureGym.App %s{commandName} ")
+                    |> Console.Error.WriteLine
+
+                    Error 127
+                | Ok args ->
+
+                run args |> Ok
+        }
+        |> command.Apply
+        |> Result.cata (fun t -> t.Result) id
diff --git a/PureGym.App/PureGym.App.fsproj b/PureGym.App/PureGym.App.fsproj
new file mode 100644
index 0000000..1e026b5
--- /dev/null
+++ b/PureGym.App/PureGym.App.fsproj
@@ -0,0 +1,28 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <OutputType>Exe</OutputType>
+        <TargetFramework>net7.0</TargetFramework>
+    </PropertyGroup>
+
+    <ItemGroup>
+      <Compile Include="Result.fs" />
+      <Compile Include="Exception.fs" />
+      <Compile Include="ArgsCrate.fs" />
+      <Compile Include="AuthArg.fs" />
+      <Compile Include="Authenticate.fs" />
+      <Compile Include="Fullness.fs" />
+      <Compile Include="LookupGym.fs" />
+      <Compile Include="MemberActivity.fs" />
+      <Compile Include="Program.fs" />
+    </ItemGroup>
+
+    <ItemGroup>
+      <ProjectReference Include="..\PureGym\PureGym.fsproj" />
+    </ItemGroup>
+
+    <ItemGroup>
+      <PackageReference Include="Argu" Version="6.1.1" />
+    </ItemGroup>
+
+</Project>
diff --git a/PureGym.App/Result.fs b/PureGym.App/Result.fs
new file mode 100644
index 0000000..57e2756
--- /dev/null
+++ b/PureGym.App/Result.fs
@@ -0,0 +1,9 @@
+namespace PureGym.App
+
+[<RequireQualifiedAccess>]
+module Result =
+
+    let cata<'ok, 'err, 'result> onOk onError (r : Result<'ok, 'err>) : 'result =
+        match r with
+        | Ok ok -> onOk ok
+        | Error e -> onError e
diff --git a/PureGym.Test/PureGym.Test.fsproj b/PureGym.Test/PureGym.Test.fsproj
new file mode 100644
index 0000000..05ad172
--- /dev/null
+++ b/PureGym.Test/PureGym.Test.fsproj
@@ -0,0 +1,27 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <TargetFramework>net7.0</TargetFramework>
+
+        <IsPackable>false</IsPackable>
+        <IsTestProject>true</IsTestProject>
+    </PropertyGroup>
+
+    <ItemGroup>
+        <Compile Include="TestSurface.fs" />
+    </ItemGroup>
+
+    <ItemGroup>
+        <PackageReference Include="ApiSurface" Version="4.0.12" />
+        <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.6.0"/>
+        <PackageReference Include="NUnit" Version="3.13.3"/>
+        <PackageReference Include="NUnit3TestAdapter" Version="4.4.2"/>
+        <PackageReference Include="NUnit.Analyzers" Version="3.6.1"/>
+        <PackageReference Include="coverlet.collector" Version="3.2.0"/>
+    </ItemGroup>
+
+    <ItemGroup>
+      <ProjectReference Include="..\PureGym\PureGym.fsproj" />
+    </ItemGroup>
+
+</Project>
diff --git a/PureGym.Test/TestSurface.fs b/PureGym.Test/TestSurface.fs
new file mode 100644
index 0000000..b88460e
--- /dev/null
+++ b/PureGym.Test/TestSurface.fs
@@ -0,0 +1,21 @@
+namespace PureGym.Test
+
+open PureGym
+open NUnit.Framework
+open ApiSurface
+
+[<TestFixture>]
+module TestSurface =
+
+    let assembly = typeof<Gym>.Assembly
+
+    [<Test>]
+    let ``Ensure API surface has not been modified`` () = ApiSurface.assertIdentical assembly
+
+    [<Test ; Explicit>]
+    let ``Update API surface`` () =
+        ApiSurface.writeAssemblyBaseline assembly
+
+    [<Test ; Explicit "This isn't done yet">]
+    let ``Ensure public API is fully documented`` () =
+        DocCoverage.assertFullyDocumented assembly
diff --git a/PureGym.sln b/PureGym.sln
new file mode 100644
index 0000000..034b8a5
--- /dev/null
+++ b/PureGym.sln
@@ -0,0 +1,28 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+Project("{F2A71F9B-5D33-465A-A702-920D77279786}") = "PureGym", "PureGym\PureGym.fsproj", "{BDF66CFC-5F2C-4AC4-A9FE-FB3B135E47FF}"
+EndProject
+Project("{F2A71F9B-5D33-465A-A702-920D77279786}") = "PureGym.App", "PureGym.App\PureGym.App.fsproj", "{B4848668-4CB2-4919-987D-8C95F865C81E}"
+EndProject
+Project("{F2A71F9B-5D33-465A-A702-920D77279786}") = "PureGym.Test", "PureGym.Test\PureGym.Test.fsproj", "{F09DF609-5F53-4BB3-BD64-DDB136CD4D2E}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{BDF66CFC-5F2C-4AC4-A9FE-FB3B135E47FF}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{BDF66CFC-5F2C-4AC4-A9FE-FB3B135E47FF}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{BDF66CFC-5F2C-4AC4-A9FE-FB3B135E47FF}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{BDF66CFC-5F2C-4AC4-A9FE-FB3B135E47FF}.Release|Any CPU.Build.0 = Release|Any CPU
+		{B4848668-4CB2-4919-987D-8C95F865C81E}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{B4848668-4CB2-4919-987D-8C95F865C81E}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{B4848668-4CB2-4919-987D-8C95F865C81E}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{B4848668-4CB2-4919-987D-8C95F865C81E}.Release|Any CPU.Build.0 = Release|Any CPU
+		{F09DF609-5F53-4BB3-BD64-DDB136CD4D2E}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{F09DF609-5F53-4BB3-BD64-DDB136CD4D2E}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{F09DF609-5F53-4BB3-BD64-DDB136CD4D2E}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{F09DF609-5F53-4BB3-BD64-DDB136CD4D2E}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+EndGlobal
diff --git a/PureGym/Api.fs b/PureGym/Api.fs
new file mode 100644
index 0000000..54944f6
--- /dev/null
+++ b/PureGym/Api.fs
@@ -0,0 +1,272 @@
+namespace PureGym
+
+open System
+open System.Net.Http
+open System.Text.Json.Serialization
+open System.Threading.Tasks
+open RestEase
+
+/// Describes the opening hours of a given gym.
+type GymOpeningHours =
+    {
+        /// If this is true, there should be no OpeningHours (but nothing enforces that).
+        IsAlwaysOpen : bool
+        /// This is a pretty unstructured list, which is in general not really parseable: it's human-readable only.
+        OpeningHours : string list
+    }
+
+    /// Human-readable representation
+    override this.ToString () =
+        if this.IsAlwaysOpen then
+            "always open"
+        else
+            this.OpeningHours |> String.concat ", "
+
+/// How a human can authenticate with a gym when they physically try to enter it
+type GymAccessOptions =
+    {
+        /// This gym has PIN entry pads
+        PinAccess : bool
+        /// This gym has a QR code scanner. QR codes can be generated with the PureGym app.
+        QrCodeAccess : bool
+    }
+
+    /// Human-readable representation
+    override this.ToString () =
+        $"Pin access: %c{Char.emoji this.PinAccess}; QR code access: %c{Char.emoji this.QrCodeAccess}"
+
+/// Where a gym is on the Earth
+type GymLocation =
+    {
+        /// Measured in degrees
+        Longitude : float
+        /// Measured in degrees
+        Latitude : float
+    }
+
+/// The postal address of a gym
+type GymAddress =
+    {
+        /// E.g. "Canterbury Court"
+        [<JsonRequired>]
+        AddressLine1 : string
+        /// E.g. "Units 4, 4A, 5 And 5A"
+        AddressLine2 : string
+        /// E.g. "Kennington Park"
+        AddressLine3 : string
+        /// E.g. "LONDON"
+        [<JsonRequired>]
+        Town : string
+        County : string
+        /// E.g. "SW9 6DE"
+        [<JsonRequired>]
+        Postcode : string
+    }
+
+    /// Human-readable statement of the address
+    override this.ToString () =
+        [
+            yield Some this.AddressLine1
+            yield this.AddressLine2 |> Option.ofObj
+            yield this.AddressLine3 |> Option.ofObj
+            match this.County with
+            | null -> yield Some $"%s{this.Town} %s{this.Postcode}"
+            | county ->
+                yield Some this.Town
+                yield Some $"%s{county} %s{this.Postcode}"
+        ]
+        |> Seq.choose id
+        |> String.concat "\n"
+
+/// Metadata about a physical gym
+type Gym =
+    {
+        // The following fields are returned but are always null
+        // ReasonsToJoin : string
+        // VirtualTourUrl : Uri
+        // PersonalTrainersUrl : Uri
+        // WebViewUrl : Uri
+        // FloorPlanUrl : Uri
+        // StaffMembers : string
+
+        /// The name of this gym, e.g. "London Oval"
+        [<JsonRequired>]
+        Name : string
+        /// This gym's ID in the PureGym system, e.g. 19
+        [<JsonRequired>]
+        Id : int
+        /// I don't know what this status is. Please tell me if you know!
+        [<JsonRequired>]
+        Status : int
+        /// Postal address of this gym
+        [<JsonRequired>]
+        Address : GymAddress
+        /// Phone number of this gym, e.g. "+44 1234 567890"
+        [<JsonRequired>]
+        PhoneNumber : string
+        /// Contact email address for this gym's staff
+        [<JsonRequired>]
+        EmailAddress : string
+        /// When this gym is open
+        [<JsonRequired>]
+        GymOpeningHours : GymOpeningHours
+        /// How a human can physically authenticate when they physically enter this gym
+        [<JsonRequired>]
+        AccessOptions : GymAccessOptions
+        /// Where this gym is physically located
+        [<JsonRequired>]
+        Location : GymLocation
+        /// The IANA time zone this gym observes, e.g. "Europe/London"
+        [<JsonRequired>]
+        TimeZone : string
+        /// This is a date-time in the format yyyy-MM-ddTHH:mm:ss+01 Europe/London
+        ReopenDate : string
+    }
+
+    /// Human-readable representation of the most important information about this gym
+    override this.ToString () =
+        $"""%s{this.Name} (%i{this.Id})
+{this.Address}
+%s{this.EmailAddress}   %s{this.PhoneNumber}
+Opening hours: %s{string<GymOpeningHours> this.GymOpeningHours}
+%s{string<GymAccessOptions> this.AccessOptions}
+"""
+
+/// A human member of PureGym
+type Member =
+    {
+        /// This member's ID. This is a fairly large number.
+        Id : int
+        /// No idea what this is - please tell me if you know!
+        CompoundMemberId : string
+        /// First name, e.g. "Patrick"
+        FirstName : string
+        /// Last name, e.g. "Stevens"
+        LastName : string
+        /// ID of the gym designated as this user's home gym. This is also the "Id" field of the appropriate Gym object.
+        HomeGymId : int
+        /// The name of the gym designated as this user's home gym. This is also the "Name" field of the appropriate
+        /// Gym object.
+        HomeGymName : string
+        /// This user's email address
+        EmailAddress : string
+        /// This user's gym access pin, probably 8 digits
+        GymAccessPin : string
+        /// This user's recorded date of birth
+        DateOfBirth : DateOnly
+        /// This user's phone number, human-readable
+        MobileNumber : string
+        /// This user's registered home postcode
+        Postcode : string
+        /// E.g. "Corporate"
+        MembershipName : string
+        MembershipLevel : int
+        SuspendedReason : int
+        MemberStatus : int
+    }
+
+/// Statistics for how many people are currently at a gym
+type GymAttendance =
+    {
+        [<JsonRequired>]
+        Description : string
+        /// How many people are in the gym as of this statistics snapshot
+        [<JsonRequired>]
+        TotalPeopleInGym : int
+        /// How many people are in classes at the gym as of this statistics snapshot
+        [<JsonRequired>]
+        TotalPeopleInClasses : int
+        TotalPeopleSuffix : string
+        [<JsonRequired>]
+        IsApproximate : bool
+        /// When the query was received (I think)
+        AttendanceTime : DateTime
+        /// When the "total people in gym" snapshot was taken that is reported here
+        LastRefreshed : DateTime
+        /// When the "number of people in classes" snapshot was taken that is reported here
+        LastRefreshedPeopleInClasses : DateTime
+        /// Maximum capacity of the gym, or 0 if no listed capacity
+        MaximumCapacity : int
+    }
+
+    /// Human-readable representation
+    override this.ToString () =
+        if not (Object.ReferenceEquals (this.TotalPeopleSuffix, null)) then
+            failwith $"Unexpectedly got Total People Suffix: %s{this.TotalPeopleSuffix}"
+
+        let capacity =
+            if this.MaximumCapacity = 0 then
+                ""
+            else
+                $" out of %i{this.MaximumCapacity} maximum"
+
+        let classes =
+            if this.TotalPeopleInClasses = 0 then
+                ""
+            else
+                $"\n%i{this.TotalPeopleInClasses} in classes"
+
+        $"""%i{this.TotalPeopleInGym} in gym%s{capacity} (is exact: %c{Char.emoji (not this.IsApproximate)})%s{classes}
+Query made at %s{this.AttendanceTime.ToString ("s")}%s{this.AttendanceTime.ToString ("zzz")}
+Snapshot correct as of %s{this.LastRefreshed.ToString ("s")}%s{this.LastRefreshed.ToString ("zzz")}
+Classes info correct as of %s{this.LastRefreshedPeopleInClasses.ToString ("s")}%s{this.LastRefreshedPeopleInClasses.ToString ("zzz")}"""
+
+/// The visit statistics for a particular human to a particular gym.
+/// The semantics of this class are basically unknown.
+type MemberActivity =
+    {
+        /// ??? semantics unknown; this was 2852 for me
+        [<JsonPropertyName "totalDuration">]
+        TotalDurationMinutes : int
+        [<JsonPropertyName "averageDuration">]
+        AverageDurationMinutes : int
+        TotalVisits : int
+        TotalClasses : int
+        IsEstimated : bool
+        LastRefreshed : DateTime
+    }
+
+/// The PureGym REST API. You probably want to instantiate one of these with `Api.make`.
+[<Header("User-Agent", "PureGym/1523 CFNetwork/1312 Darwin/21.0.0")>]
+type IPureGymApi =
+    /// Get the complete list of all gyms known to PureGym.
+    [<Get "v1/gyms/">]
+    abstract GetGyms : unit -> Task<Gym list>
+
+    /// Get information about the PureGym human whose credentials this client is authenticated with.
+    [<Get "v1/member">]
+    abstract GetMember : unit -> Task<Member>
+
+    /// Get information about how full the given gym currently is. The gym ID can be found from `GetGyms`.
+    [<Get "v1/gyms/{gym_id}/attendance">]
+    abstract GetGymAttendance : [<Path "gym_id">] gymId : int -> Task<GymAttendance>
+
+    /// Get information about a specific gym.
+    [<Get "v1/gyms/{gym_id}">]
+    abstract GetGym : [<Path "gym_id">] gymId : int -> Task<Gym>
+
+    /// Get information about the activities logged against the currently authenticated PureGym human.
+    [<Get "v1/member/activity">]
+    abstract GetMemberActivity : unit -> Task<MemberActivity>
+
+/// Methods for interacting with the PureGym REST API.
+[<RequireQualifiedAccess>]
+module Api =
+    /// Create a REST client, authenticated as the specified user.
+    let make (auth : Auth) : IPureGymApi Task =
+        task {
+            let! token =
+                match auth with
+                | Auth.Token t -> Task.FromResult<_> t
+                | Auth.User cred -> AuthToken.get cred
+
+            let client = new HttpClient ()
+            client.BaseAddress <- Uri "https://capi.puregym.com/api"
+
+            client.DefaultRequestHeaders.Authorization <-
+                Headers.AuthenticationHeaderValue ("Bearer", token.AccessToken)
+
+            client.DefaultRequestHeaders.Add ("User-Agent", "PureGym/1523 CFNetwork/1312 Darwin/21.0.0")
+
+            return RestClient.For<IPureGymApi> client
+        }
diff --git a/PureGym/Auth.fs b/PureGym/Auth.fs
new file mode 100644
index 0000000..4aca107
--- /dev/null
+++ b/PureGym/Auth.fs
@@ -0,0 +1,97 @@
+namespace PureGym
+
+open System
+open System.Collections.Generic
+open System.Net.Http
+open System.Text.Json
+open System.Text.Json.Serialization
+open System.Threading.Tasks
+
+// System.Text.Json does not support internal F# records as of .NET 8, presumably because it can't find the constructor.
+// So we end up with this gruesome soup of C#.
+// TODO(net8): make this internal
+type AuthResponseRaw [<JsonConstructor>] (access_token : string, expires_in : int, token_type : string, scope : string)
+    =
+    member _.access_token = access_token
+    member _.expires_in = expires_in
+    member _.token_type = token_type
+    member _.scope = scope
+
+/// A token which can be used to authenticate with the PureGym API.
+type AuthToken =
+    {
+        /// A string which can be passed as the "Bearer" in an Authorization header
+        AccessToken : string
+        /// Time that this token expires, if known
+        ExpiryTime : DateTime option
+    }
+
+    static member internal Parse (response : AuthResponseRaw) : AuthToken =
+        if response.scope <> "pgcapi" then
+            failwithf $"unexpected scope: %s{response.scope}"
+
+        if response.token_type <> "Bearer" then
+            failwithf $"unexpected type: %s{response.token_type}"
+
+        {
+            AccessToken = response.access_token
+            ExpiryTime = Some (DateTime.Now + TimeSpan.FromSeconds response.expires_in)
+        }
+
+/// Authentication credentials as known to a human user
+type UsernamePin =
+    {
+        /// The user's email address
+        Username : string
+        /// Eight-digit PIN
+        Pin : string
+    }
+
+/// Any way to authenticate with the PureGym API.
+type Auth =
+    /// Authenticate with credentials which are known to the user
+    | User of UsernamePin
+    /// An AuthToken (that is, a bearer token)
+    | Token of AuthToken
+
+/// Methods for constructing PureGym authentication tokens.
+[<RequireQualifiedAccess>]
+module AuthToken =
+    /// Construct an AuthToken given that you already have a bearer token.
+    let ofBearerToken (token : string) : AuthToken =
+        {
+            AccessToken = token
+            ExpiryTime = None
+        }
+
+    let private options = JsonSerializerOptions (IncludeFields = true)
+
+    /// Get an AuthToken for the given user email address with the given eight-digit PureGym PIN.
+    let get (creds : UsernamePin) : Task<AuthToken> =
+        task {
+            use client = new HttpClient ()
+            client.BaseAddress <- Uri "https://auth.puregym.com"
+            client.DefaultRequestHeaders.Add ("User-Agent", "PureGym/1523 CFNetwork/1312 Darwin/21.0.0")
+
+            let request =
+                [
+                    "grant_type", "password"
+                    "username", creds.Username
+                    "password", creds.Pin
+                    "scope", "pgcapi"
+                    "client_id", "ro.client"
+                ]
+                |> List.map KeyValuePair
+
+            use content = new FormUrlEncodedContent (request)
+            let! response = client.PostAsync (Uri "https://auth.puregym.com/connect/token", content)
+
+            if response.IsSuccessStatusCode then
+                let! content = response.Content.ReadAsStreamAsync ()
+                let! response = JsonSerializer.DeserializeAsync<AuthResponseRaw> (content, options)
+                // let! response = JsonSerializer.DeserializeAsync<AuthResponseRaw> (content, options)
+                return AuthToken.Parse response
+            else
+                let! content = response.Content.ReadAsStringAsync ()
+                return failwithf $"bad status code: %+A{response.StatusCode}\n%s{content}"
+        }
diff --git a/PureGym/GymSelector.fs b/PureGym/GymSelector.fs
new file mode 100644
index 0000000..0694551
--- /dev/null
+++ b/PureGym/GymSelector.fs
@@ -0,0 +1,48 @@
+namespace PureGym
+
+open System.Threading.Tasks
+open Fastenshtein
+
+/// Identifies a gym, possibly non-uniquely and possibly ambiguously.
+[<RequireQualifiedAccess>]
+type GymSelector =
+    /// The ID of this gym, according to the PureGym internal mapping.
+    | Id of int
+    /// The user-specified name of this gym.
+    | Name of string
+    /// The home gym of the authenticated user.
+    | Home
+
+/// Methods for manipulating GymSelector.
+[<RequireQualifiedAccess>]
+module GymSelector =
+
+    /// Get the canonical PureGym ID for this user-specified gym.
+    let canonicalId (client : IPureGymApi) (gym : GymSelector) : int Task =
+        match gym with
+        | GymSelector.Home ->
+            task {
+                let! self = client.GetMember ()
+                return self.HomeGymId
+            }
+        | GymSelector.Id i -> Task.FromResult<_> i
+        | GymSelector.Name name ->
+            task {
+                let! allGyms = client.GetGyms ()
+
+                if allGyms.IsEmpty then
+                    return failwith "PureGym API returned no gyms!"
+                else
+                    let distance = Levenshtein (name.ToLowerInvariant ())
+
+                    let bestDistance, bestGym =
+                        allGyms
+                        |> Seq.map (fun gym -> distance.DistanceFrom (gym.Name.ToLowerInvariant ()), gym)
+                        |> Seq.sortBy fst
+                        |> Seq.head
+
+                    if bestDistance <> 0 then
+                        System.Console.Error.WriteLine $"Autocorrected gym from %s{name} to %s{bestGym.Name}"
+
+                    return bestGym.Id
+            }
diff --git a/PureGym/PureGym.fsproj b/PureGym/PureGym.fsproj
new file mode 100644
index 0000000..7523f84
--- /dev/null
+++ b/PureGym/PureGym.fsproj
@@ -0,0 +1,24 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+      <TargetFramework>net6.0</TargetFramework>
+      <GenerateDocumentationFile>true</GenerateDocumentationFile>
+    </PropertyGroup>
+
+    <ItemGroup>
+        <Compile Include="String.fs" />
+        <Compile Include="Auth.fs" />
+        <Compile Include="Api.fs" />
+        <Compile Include="GymSelector.fs" />
+        <EmbeddedResource Include="SurfaceBaseline.txt" />
+        <EmbeddedResource Include="version.json" />
+    </ItemGroup>
+
+    <ItemGroup>
+      <PackageReference Include="RestEase" Version="1.6.4" />
+      <PackageReference Update="FSharp.Core" Version="6.0.0" />
+      <PackageReference Include="System.Text.Json" Version="7.0.3" />
+      <PackageReference Include="Fastenshtein" Version="1.0.0.8" />
+    </ItemGroup>
+
+</Project>
diff --git a/PureGym/String.fs b/PureGym/String.fs
new file mode 100644
index 0000000..8adb935
--- /dev/null
+++ b/PureGym/String.fs
@@ -0,0 +1,5 @@
+namespace PureGym
+
+[<RequireQualifiedAccess>]
+module internal Char =
+    let emoji bool = if bool then '✅' else '❌'
diff --git a/PureGym/SurfaceBaseline.txt b/PureGym/SurfaceBaseline.txt
new file mode 100644
index 0000000..3100d4f
--- /dev/null
+++ b/PureGym/SurfaceBaseline.txt
@@ -0,0 +1,198 @@
+PureGym.Api inherit obj
+PureGym.Api.make [static method]: PureGym.Auth -> PureGym.IPureGymApi System.Threading.Tasks.Task
+PureGym.Auth inherit obj, implements PureGym.Auth System.IEquatable, System.Collections.IStructuralEquatable, PureGym.Auth System.IComparable, System.IComparable, System.Collections.IStructuralComparable - union type with 2 cases
+PureGym.Auth+Tags inherit obj
+PureGym.Auth+Tags.Token [static field]: int = 1
+PureGym.Auth+Tags.User [static field]: int = 0
+PureGym.Auth+Token inherit PureGym.Auth
+PureGym.Auth+Token.get_Item [method]: unit -> PureGym.AuthToken
+PureGym.Auth+Token.Item [property]: [read-only] PureGym.AuthToken
+PureGym.Auth+User inherit PureGym.Auth
+PureGym.Auth+User.get_Item [method]: unit -> PureGym.UsernamePin
+PureGym.Auth+User.Item [property]: [read-only] PureGym.UsernamePin
+PureGym.Auth.get_IsToken [method]: unit -> bool
+PureGym.Auth.get_IsUser [method]: unit -> bool
+PureGym.Auth.get_Tag [method]: unit -> int
+PureGym.Auth.IsToken [property]: [read-only] bool
+PureGym.Auth.IsUser [property]: [read-only] bool
+PureGym.Auth.NewToken [static method]: PureGym.AuthToken -> PureGym.Auth
+PureGym.Auth.NewUser [static method]: PureGym.UsernamePin -> PureGym.Auth
+PureGym.Auth.Tag [property]: [read-only] int
+PureGym.AuthResponseRaw inherit obj
+PureGym.AuthResponseRaw..ctor [constructor]: (string, int, string, string)
+PureGym.AuthResponseRaw.access_token [property]: [read-only] string
+PureGym.AuthResponseRaw.expires_in [property]: [read-only] int
+PureGym.AuthResponseRaw.get_access_token [method]: unit -> string
+PureGym.AuthResponseRaw.get_expires_in [method]: unit -> int
+PureGym.AuthResponseRaw.get_scope [method]: unit -> string
+PureGym.AuthResponseRaw.get_token_type [method]: unit -> string
+PureGym.AuthResponseRaw.scope [property]: [read-only] string
+PureGym.AuthResponseRaw.token_type [property]: [read-only] string
+PureGym.AuthToken inherit obj, implements PureGym.AuthToken System.IEquatable, System.Collections.IStructuralEquatable, PureGym.AuthToken System.IComparable, System.IComparable, System.Collections.IStructuralComparable
+PureGym.AuthToken..ctor [constructor]: (string, System.DateTime option)
+PureGym.AuthToken.AccessToken [property]: [read-only] string
+PureGym.AuthToken.ExpiryTime [property]: [read-only] System.DateTime option
+PureGym.AuthToken.get_AccessToken [method]: unit -> string
+PureGym.AuthToken.get_ExpiryTime [method]: unit -> System.DateTime option
+PureGym.AuthTokenModule inherit obj
+PureGym.AuthTokenModule.get [static method]: PureGym.UsernamePin -> PureGym.AuthToken System.Threading.Tasks.Task
+PureGym.AuthTokenModule.ofBearerToken [static method]: string -> PureGym.AuthToken
+PureGym.Gym inherit obj, implements PureGym.Gym System.IEquatable, System.Collections.IStructuralEquatable, PureGym.Gym System.IComparable, System.IComparable, System.Collections.IStructuralComparable
+PureGym.Gym..ctor [constructor]: (string, int, int, PureGym.GymAddress, string, string, PureGym.GymOpeningHours, PureGym.GymAccessOptions, PureGym.GymLocation, string, string)
+PureGym.Gym.AccessOptions [property]: [read-only] PureGym.GymAccessOptions
+PureGym.Gym.Address [property]: [read-only] PureGym.GymAddress
+PureGym.Gym.EmailAddress [property]: [read-only] string
+PureGym.Gym.get_AccessOptions [method]: unit -> PureGym.GymAccessOptions
+PureGym.Gym.get_Address [method]: unit -> PureGym.GymAddress
+PureGym.Gym.get_EmailAddress [method]: unit -> string
+PureGym.Gym.get_GymOpeningHours [method]: unit -> PureGym.GymOpeningHours
+PureGym.Gym.get_Id [method]: unit -> int
+PureGym.Gym.get_Location [method]: unit -> PureGym.GymLocation
+PureGym.Gym.get_Name [method]: unit -> string
+PureGym.Gym.get_PhoneNumber [method]: unit -> string
+PureGym.Gym.get_ReopenDate [method]: unit -> string
+PureGym.Gym.get_Status [method]: unit -> int
+PureGym.Gym.get_TimeZone [method]: unit -> string
+PureGym.Gym.GymOpeningHours [property]: [read-only] PureGym.GymOpeningHours
+PureGym.Gym.Id [property]: [read-only] int
+PureGym.Gym.Location [property]: [read-only] PureGym.GymLocation
+PureGym.Gym.Name [property]: [read-only] string
+PureGym.Gym.PhoneNumber [property]: [read-only] string
+PureGym.Gym.ReopenDate [property]: [read-only] string
+PureGym.Gym.Status [property]: [read-only] int
+PureGym.Gym.TimeZone [property]: [read-only] string
+PureGym.GymAccessOptions inherit obj, implements PureGym.GymAccessOptions System.IEquatable, System.Collections.IStructuralEquatable, PureGym.GymAccessOptions System.IComparable, System.IComparable, System.Collections.IStructuralComparable
+PureGym.GymAccessOptions..ctor [constructor]: (bool, bool)
+PureGym.GymAccessOptions.get_PinAccess [method]: unit -> bool
+PureGym.GymAccessOptions.get_QrCodeAccess [method]: unit -> bool
+PureGym.GymAccessOptions.PinAccess [property]: [read-only] bool
+PureGym.GymAccessOptions.QrCodeAccess [property]: [read-only] bool
+PureGym.GymAddress inherit obj, implements PureGym.GymAddress System.IEquatable, System.Collections.IStructuralEquatable, PureGym.GymAddress System.IComparable, System.IComparable, System.Collections.IStructuralComparable
+PureGym.GymAddress..ctor [constructor]: (string, string, string, string, string, string)
+PureGym.GymAddress.AddressLine1 [property]: [read-only] string
+PureGym.GymAddress.AddressLine2 [property]: [read-only] string
+PureGym.GymAddress.AddressLine3 [property]: [read-only] string
+PureGym.GymAddress.County [property]: [read-only] string
+PureGym.GymAddress.get_AddressLine1 [method]: unit -> string
+PureGym.GymAddress.get_AddressLine2 [method]: unit -> string
+PureGym.GymAddress.get_AddressLine3 [method]: unit -> string
+PureGym.GymAddress.get_County [method]: unit -> string
+PureGym.GymAddress.get_Postcode [method]: unit -> string
+PureGym.GymAddress.get_Town [method]: unit -> string
+PureGym.GymAddress.Postcode [property]: [read-only] string
+PureGym.GymAddress.Town [property]: [read-only] string
+PureGym.GymAttendance inherit obj, implements PureGym.GymAttendance System.IEquatable, System.Collections.IStructuralEquatable, PureGym.GymAttendance System.IComparable, System.IComparable, System.Collections.IStructuralComparable
+PureGym.GymAttendance..ctor [constructor]: (string, int, int, string, bool, System.DateTime, System.DateTime, System.DateTime, int)
+PureGym.GymAttendance.AttendanceTime [property]: [read-only] System.DateTime
+PureGym.GymAttendance.Description [property]: [read-only] string
+PureGym.GymAttendance.get_AttendanceTime [method]: unit -> System.DateTime
+PureGym.GymAttendance.get_Description [method]: unit -> string
+PureGym.GymAttendance.get_IsApproximate [method]: unit -> bool
+PureGym.GymAttendance.get_LastRefreshed [method]: unit -> System.DateTime
+PureGym.GymAttendance.get_LastRefreshedPeopleInClasses [method]: unit -> System.DateTime
+PureGym.GymAttendance.get_MaximumCapacity [method]: unit -> int
+PureGym.GymAttendance.get_TotalPeopleInClasses [method]: unit -> int
+PureGym.GymAttendance.get_TotalPeopleInGym [method]: unit -> int
+PureGym.GymAttendance.get_TotalPeopleSuffix [method]: unit -> string
+PureGym.GymAttendance.IsApproximate [property]: [read-only] bool
+PureGym.GymAttendance.LastRefreshed [property]: [read-only] System.DateTime
+PureGym.GymAttendance.LastRefreshedPeopleInClasses [property]: [read-only] System.DateTime
+PureGym.GymAttendance.MaximumCapacity [property]: [read-only] int
+PureGym.GymAttendance.TotalPeopleInClasses [property]: [read-only] int
+PureGym.GymAttendance.TotalPeopleInGym [property]: [read-only] int
+PureGym.GymAttendance.TotalPeopleSuffix [property]: [read-only] string
+PureGym.GymLocation inherit obj, implements PureGym.GymLocation System.IEquatable, System.Collections.IStructuralEquatable, PureGym.GymLocation System.IComparable, System.IComparable, System.Collections.IStructuralComparable
+PureGym.GymLocation..ctor [constructor]: (float, float)
+PureGym.GymLocation.get_Latitude [method]: unit -> float
+PureGym.GymLocation.get_Longitude [method]: unit -> float
+PureGym.GymLocation.Latitude [property]: [read-only] float
+PureGym.GymLocation.Longitude [property]: [read-only] float
+PureGym.GymOpeningHours inherit obj, implements PureGym.GymOpeningHours System.IEquatable, System.Collections.IStructuralEquatable, PureGym.GymOpeningHours System.IComparable, System.IComparable, System.Collections.IStructuralComparable
+PureGym.GymOpeningHours..ctor [constructor]: (bool, string list)
+PureGym.GymOpeningHours.get_IsAlwaysOpen [method]: unit -> bool
+PureGym.GymOpeningHours.get_OpeningHours [method]: unit -> string list
+PureGym.GymOpeningHours.IsAlwaysOpen [property]: [read-only] bool
+PureGym.GymOpeningHours.OpeningHours [property]: [read-only] string list
+PureGym.GymSelector inherit obj, implements PureGym.GymSelector System.IEquatable, System.Collections.IStructuralEquatable, PureGym.GymSelector System.IComparable, System.IComparable, System.Collections.IStructuralComparable - union type with 3 cases
+PureGym.GymSelector+Id inherit PureGym.GymSelector
+PureGym.GymSelector+Id.get_Item [method]: unit -> int
+PureGym.GymSelector+Id.Item [property]: [read-only] int
+PureGym.GymSelector+Name inherit PureGym.GymSelector
+PureGym.GymSelector+Name.get_Item [method]: unit -> string
+PureGym.GymSelector+Name.Item [property]: [read-only] string
+PureGym.GymSelector+Tags inherit obj
+PureGym.GymSelector+Tags.Home [static field]: int = 2
+PureGym.GymSelector+Tags.Id [static field]: int = 0
+PureGym.GymSelector+Tags.Name [static field]: int = 1
+PureGym.GymSelector.get_Home [static method]: unit -> PureGym.GymSelector
+PureGym.GymSelector.get_IsHome [method]: unit -> bool
+PureGym.GymSelector.get_IsId [method]: unit -> bool
+PureGym.GymSelector.get_IsName [method]: unit -> bool
+PureGym.GymSelector.get_Tag [method]: unit -> int
+PureGym.GymSelector.Home [static property]: [read-only] PureGym.GymSelector
+PureGym.GymSelector.IsHome [property]: [read-only] bool
+PureGym.GymSelector.IsId [property]: [read-only] bool
+PureGym.GymSelector.IsName [property]: [read-only] bool
+PureGym.GymSelector.NewId [static method]: int -> PureGym.GymSelector
+PureGym.GymSelector.NewName [static method]: string -> PureGym.GymSelector
+PureGym.GymSelector.Tag [property]: [read-only] int
+PureGym.GymSelectorModule inherit obj
+PureGym.GymSelectorModule.canonicalId [static method]: PureGym.IPureGymApi -> PureGym.GymSelector -> int System.Threading.Tasks.Task
+PureGym.IPureGymApi - interface with 5 member(s)
+PureGym.IPureGymApi.GetGym [method]: int -> PureGym.Gym System.Threading.Tasks.Task
+PureGym.IPureGymApi.GetGymAttendance [method]: int -> PureGym.GymAttendance System.Threading.Tasks.Task
+PureGym.IPureGymApi.GetGyms [method]: unit -> PureGym.Gym list System.Threading.Tasks.Task
+PureGym.IPureGymApi.GetMember [method]: unit -> PureGym.Member System.Threading.Tasks.Task
+PureGym.IPureGymApi.GetMemberActivity [method]: unit -> PureGym.MemberActivity System.Threading.Tasks.Task
+PureGym.Member inherit obj, implements PureGym.Member System.IEquatable, System.Collections.IStructuralEquatable, PureGym.Member System.IComparable, System.IComparable, System.Collections.IStructuralComparable
+PureGym.Member..ctor [constructor]: (int, string, string, string, int, string, string, string, System.DateOnly, string, string, string, int, int, int)
+PureGym.Member.CompoundMemberId [property]: [read-only] string
+PureGym.Member.DateOfBirth [property]: [read-only] System.DateOnly
+PureGym.Member.EmailAddress [property]: [read-only] string
+PureGym.Member.FirstName [property]: [read-only] string
+PureGym.Member.get_CompoundMemberId [method]: unit -> string
+PureGym.Member.get_DateOfBirth [method]: unit -> System.DateOnly
+PureGym.Member.get_EmailAddress [method]: unit -> string
+PureGym.Member.get_FirstName [method]: unit -> string
+PureGym.Member.get_GymAccessPin [method]: unit -> string
+PureGym.Member.get_HomeGymId [method]: unit -> int
+PureGym.Member.get_HomeGymName [method]: unit -> string
+PureGym.Member.get_Id [method]: unit -> int
+PureGym.Member.get_LastName [method]: unit -> string
+PureGym.Member.get_MembershipLevel [method]: unit -> int
+PureGym.Member.get_MembershipName [method]: unit -> string
+PureGym.Member.get_MemberStatus [method]: unit -> int
+PureGym.Member.get_MobileNumber [method]: unit -> string
+PureGym.Member.get_Postcode [method]: unit -> string
+PureGym.Member.get_SuspendedReason [method]: unit -> int
+PureGym.Member.GymAccessPin [property]: [read-only] string
+PureGym.Member.HomeGymId [property]: [read-only] int
+PureGym.Member.HomeGymName [property]: [read-only] string
+PureGym.Member.Id [property]: [read-only] int
+PureGym.Member.LastName [property]: [read-only] string
+PureGym.Member.MembershipLevel [property]: [read-only] int
+PureGym.Member.MembershipName [property]: [read-only] string
+PureGym.Member.MemberStatus [property]: [read-only] int
+PureGym.Member.MobileNumber [property]: [read-only] string
+PureGym.Member.Postcode [property]: [read-only] string
+PureGym.Member.SuspendedReason [property]: [read-only] int
+PureGym.MemberActivity inherit obj, implements PureGym.MemberActivity System.IEquatable, System.Collections.IStructuralEquatable, PureGym.MemberActivity System.IComparable, System.IComparable, System.Collections.IStructuralComparable
+PureGym.MemberActivity..ctor [constructor]: (int, int, int, int, bool, System.DateTime)
+PureGym.MemberActivity.AverageDurationMinutes [property]: [read-only] int
+PureGym.MemberActivity.get_AverageDurationMinutes [method]: unit -> int
+PureGym.MemberActivity.get_IsEstimated [method]: unit -> bool
+PureGym.MemberActivity.get_LastRefreshed [method]: unit -> System.DateTime
+PureGym.MemberActivity.get_TotalClasses [method]: unit -> int
+PureGym.MemberActivity.get_TotalDurationMinutes [method]: unit -> int
+PureGym.MemberActivity.get_TotalVisits [method]: unit -> int
+PureGym.MemberActivity.IsEstimated [property]: [read-only] bool
+PureGym.MemberActivity.LastRefreshed [property]: [read-only] System.DateTime
+PureGym.MemberActivity.TotalClasses [property]: [read-only] int
+PureGym.MemberActivity.TotalDurationMinutes [property]: [read-only] int
+PureGym.MemberActivity.TotalVisits [property]: [read-only] int
+PureGym.UsernamePin inherit obj, implements PureGym.UsernamePin System.IEquatable, System.Collections.IStructuralEquatable, PureGym.UsernamePin System.IComparable, System.IComparable, System.Collections.IStructuralComparable
+PureGym.UsernamePin..ctor [constructor]: (string, string)
+PureGym.UsernamePin.get_Pin [method]: unit -> string
+PureGym.UsernamePin.get_Username [method]: unit -> string
+PureGym.UsernamePin.Pin [property]: [read-only] string
+PureGym.UsernamePin.Username [property]: [read-only] string
\ No newline at end of file
diff --git a/PureGym/version.json b/PureGym/version.json
new file mode 100644
index 0000000..5b7dc86
--- /dev/null
+++ b/PureGym/version.json
@@ -0,0 +1,7 @@
+{
+  "version": "1.0",
+  "publicReleaseRefSpec": [
+    "^refs/heads/main$"
+  ],
+  "pathFilters": null
+}
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..f635ea8
--- /dev/null
+++ b/README.md
@@ -0,0 +1,30 @@
+# Unofficial PureGym client
+
+![Status](https://woodpecker.patrickstevens.co.uk/api/badges/44/status.svg)
+
+*With thanks to [Tom Hollingsworth](https://github.com/2t6h/puregym-attendance/blob/64dcd830bd874dc0150c7767f5cc6c75ed0b9dad/puregym.py).*
+
+## Usage
+
+* With Nix: `nix run` (you can refer to this flake).
+* Manually: `git clone` and then `dotnet run --project PureGym.App/PureGym.App.fsproj`.
+
+(Something is up on Darwin: `nix run` currently produces an executable which dies instantly.
+Workaround: `nix build` and then `nix develop --command dotnet exec ./result/lib/puregym/PureGym.App.dll`.)
+
+The available subcommands can be viewed in the `subcommands` map defined in [Program.fs](./PureGym.App/Program.fs).
+As of this writing, the following are implemented:
+
+* `activity`: get the logged-in user's activity stats. I have no idea what the semantics of these numbers are!
+* `fullness`: determine how full a given gym is right now.
+* `lookup-gym`: give information about the gym's physical instantiation (e.g. its address).
+
+### Authentication
+
+You can authenticate with your PureGym email address and PIN combination, or (probably better) you can call `PureGym.App auth` to obtain a token.
+Use this token in subsequent commands by setting the `PUREGYM_BEARER_TOKEN` environment variable or supplying it as `--bearer-token`.
+
+## Structure
+
+* The REST client is at [Api.fs](./PureGym/Api.fs).
+* The standalone application is at [PureGym.App](./PureGym.App). It uses a ghastly mix of hand-rolled argument parsing and [Argu](https://fsprojects.github.io/Argu/), because Argu does not *quite* want to do what I want an argument parser to do.
diff --git a/flake.lock b/flake.lock
new file mode 100644
index 0000000..2e18027
--- /dev/null
+++ b/flake.lock
@@ -0,0 +1,60 @@
+{
+  "nodes": {
+    "flake-utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1694529238,
+        "narHash": "sha256-zsNZZGTGnMOf9YpHKJqMSsa0dXbfmxeoJ7xHlrt+xmY=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "ff7b65b44d01cf9ba6a71320833626af21126384",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1696981262,
+        "narHash": "sha256-YaCOjdqhbjBeyMjxlgFWt4XD/b9pGKWURgS3uEwNLtc=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "a2b87a4f66f309d2f4b789fd0457f5fc5db0a9a6",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs"
+      }
+    },
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}
diff --git a/flake.nix b/flake.nix
new file mode 100644
index 0000000..6abaf4f
--- /dev/null
+++ b/flake.nix
@@ -0,0 +1,114 @@
+{
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs";
+    flake-utils = {
+      url = "github:numtide/flake-utils";
+    };
+  };
+
+  outputs = inputs @ {
+    self,
+    nixpkgs,
+    flake-utils,
+    ...
+  }:
+    flake-utils.lib.eachDefaultSystem (system: let
+      pkgs = nixpkgs.legacyPackages.${system};
+      projectFile = "./PureGym.App/PureGym.App.fsproj";
+      testProjectFile = "./PureGym.Test/PureGym.Test.fsproj";
+      pname = "puregym";
+      dotnet-sdk = pkgs.dotnet-sdk_7;
+      dotnet-runtime = pkgs.dotnetCorePackages.runtime_7_0;
+      version = "0.1";
+      dotnetTool = toolName: toolVersion: sha256:
+        pkgs.stdenvNoCC.mkDerivation rec {
+          name = toolName;
+          version = toolVersion;
+          nativeBuildInputs = [pkgs.makeWrapper];
+          src = pkgs.fetchNuGet {
+            pname = name;
+            version = version;
+            sha256 = sha256;
+            installPhase = ''mkdir -p $out/bin && cp -r tools/net6.0/any/* $out/bin'';
+          };
+          installPhase = ''
+            runHook preInstall
+            mkdir -p "$out/lib"
+            cp -r ./bin/* "$out/lib"
+            makeWrapper "${dotnet-runtime}/bin/dotnet" "$out/bin/${name}" --add-flags "$out/lib/${name}.dll"
+            runHook postInstall
+          '';
+        };
+      fantomas = dotnetTool "fantomas" (builtins.fromJSON (builtins.readFile ./.config/dotnet-tools.json)).tools.fantomas.version "sha256-83RodORaC3rkYfbFMHsYLEtl0+8+akZXcKoSJdgwuUo=";
+    in {
+      packages = {
+        fantomas = fantomas;
+        fetchDeps = let
+          flags = [];
+          runtimeIds = ["win-x64"] ++ map (system: pkgs.dotnetCorePackages.systemToDotnetRid system) dotnet-sdk.meta.platforms;
+        in
+          pkgs.writeShellScriptBin "fetch-${pname}-deps" (builtins.readFile (pkgs.substituteAll {
+            src = ./nix/fetchDeps.sh;
+            pname = pname;
+            binPath = pkgs.lib.makeBinPath [pkgs.coreutils dotnet-sdk (pkgs.nuget-to-nix.override {inherit dotnet-sdk;})];
+            projectFiles = toString (pkgs.lib.toList projectFile);
+            testProjectFiles = toString (pkgs.lib.toList testProjectFile);
+            rids = pkgs.lib.concatStringsSep "\" \"" runtimeIds;
+            packages = dotnet-sdk.packages;
+            storeSrc = pkgs.srcOnly {
+              src = ./.;
+              pname = pname;
+              version = version;
+            };
+          }));
+        default = pkgs.buildDotnetModule {
+          pname = pname;
+          name = "puregym";
+          version = version;
+          src = ./.;
+          projectFile = projectFile;
+          nugetDeps = ./nix/deps.nix;
+          doCheck = true;
+          dotnet-sdk = dotnet-sdk;
+          dotnet-runtime = dotnet-runtime;
+        };
+      };
+      apps = {
+        default = {
+          type = "app";
+          program = "${self.packages.${system}.default}/bin/PureGym.App";
+        };
+      };
+      devShells.default = pkgs.mkShell {
+        buildInputs =
+          [pkgs.alejandra pkgs.dotnet-sdk_7 pkgs.python3 pkgs.nodePackages.markdown-link-check]
+          ++ (
+            if pkgs.stdenv.isDarwin
+            then [pkgs.darwin.apple_sdk.frameworks.CoreServices]
+            else []
+          );
+      };
+      checks = {
+        alejandra = pkgs.stdenvNoCC.mkDerivation {
+          name = "alejandra-check";
+          src = ./.;
+          checkPhase = ''
+            ${pkgs.alejandra}/bin/alejandra --check .
+          '';
+          installPhase = "mkdir $out";
+          dontBuild = true;
+          doCheck = true;
+        };
+        fantomas = pkgs.stdenvNoCC.mkDerivation {
+          name = "fantomas-check";
+          src = ./.;
+          checkPhase = ''
+            ${fantomas}/bin/fantomas --check .
+          '';
+          installPhase = "mkdir $out";
+          dontBuild = true;
+          doCheck = true;
+        };
+      };
+    });
+}
diff --git a/nix/deps.nix b/nix/deps.nix
new file mode 100644
index 0000000..176513c
--- /dev/null
+++ b/nix/deps.nix
@@ -0,0 +1,364 @@
+# This file was automatically generated by passthru.fetch-deps.
+# Please don't edit it manually, your changes might get overwritten!
+{fetchNuGet}: [
+  (fetchNuGet {
+    pname = "Fastenshtein";
+    version = "1.0.0.8";
+    sha256 = "1rvw27rz7qb2n68i0jvvcr224fcpy5yzzxaj1bp89jw41cpdabp2";
+  })
+  (fetchNuGet {
+    pname = "Argu";
+    version = "6.1.1";
+    sha256 = "1v996g0760qhiys2ahdpnvkldaxr2jn5f1falf789glnk4a6f3xl";
+  })
+  (fetchNuGet {
+    pname = "System.Configuration.ConfigurationManager";
+    version = "4.4.0";
+    sha256 = "1hjgmz47v5229cbzd2pwz2h0dkq78lb2wp9grx8qr72pb5i0dk7v";
+  })
+  (fetchNuGet {
+    pname = "fantomas";
+    version = "6.2.0";
+    sha256 = "sha256-83RodORaC3rkYfbFMHsYLEtl0+8+akZXcKoSJdgwuUo=";
+  })
+  (fetchNuGet {
+    pname = "ApiSurface";
+    version = "4.0.12";
+    sha256 = "0v56sv4cz8bgrfqjjg0q96619qs9dvvi0a6lp7hzz2mi82i1inmq";
+  })
+  (fetchNuGet {
+    pname = "coverlet.collector";
+    version = "3.2.0";
+    sha256 = "1qxpv8v10p5wn162lzdm193gdl6c5f81zadj8h889dprlnj3g8yr";
+  })
+  (fetchNuGet {
+    pname = "FSharp.Core";
+    version = "6.0.0";
+    sha256 = "1hjhvr39c1vpgrdmf8xln5q86424fqkvy9nirkr29vl2461d2039";
+  })
+  (fetchNuGet {
+    pname = "FSharp.Core";
+    version = "7.0.400";
+    sha256 = "1pl6iqqcpm9djfn7f6ms5j1xbcyz00nb808qd6pmsjrnylflalgp";
+  })
+  (fetchNuGet {
+    pname = "Microsoft.AspNetCore.App.Ref";
+    version = "6.0.22";
+    sha256 = "0fqpl1fr213b4fb3c6xw3fy6669yxqcp1bzcnayw80yrskw8lpxs";
+  })
+  (fetchNuGet {
+    pname = "Microsoft.AspNetCore.App.Runtime.linux-arm64";
+    version = "6.0.22";
+    sha256 = "1xvqqc7bzj764g3scp0saqxlfiv866crgi8chz57vhjp9sgd61jw";
+  })
+  (fetchNuGet {
+    pname = "Microsoft.AspNetCore.App.Runtime.linux-arm64";
+    version = "7.0.11";
+    sha256 = "0hmsqy4yc3023mcp5rg0h59yv3f8cnjhxw1g4i8md67vm5y04lfv";
+  })
+  (fetchNuGet {
+    pname = "Microsoft.AspNetCore.App.Runtime.linux-x64";
+    version = "6.0.22";
+    sha256 = "1gcv99y295fnhy12fyx8wqvbhbj6mz8p5bm66ppwdxb3zykjg2l8";
+  })
+  (fetchNuGet {
+    pname = "Microsoft.AspNetCore.App.Runtime.linux-x64";
+    version = "7.0.11";
+    sha256 = "18sk9wka8z5354ca77q43hi0615yjssdjbyi0hqq92w6zmg43vgc";
+  })
+  (fetchNuGet {
+    pname = "Microsoft.AspNetCore.App.Runtime.osx-arm64";
+    version = "6.0.22";
+    sha256 = "1ib0x1w33wqy7lgzjf14dvgx981xpjffjqd800d7wgxisgmakrmr";
+  })
+  (fetchNuGet {
+    pname = "Microsoft.AspNetCore.App.Runtime.osx-arm64";
+    version = "7.0.11";
+    sha256 = "1j0zbd4rmmd3ylgixsvyj145g2r6px6b9d9k4yxxg6d61x90c165";
+  })
+  (fetchNuGet {
+    pname = "Microsoft.AspNetCore.App.Runtime.osx-x64";
+    version = "6.0.22";
+    sha256 = "026r38a7by7wdfd3virjdaah3y2sjjmnabgf5l25vdnwpwc7c31d";
+  })
+  (fetchNuGet {
+    pname = "Microsoft.AspNetCore.App.Runtime.osx-x64";
+    version = "7.0.11";
+    sha256 = "0wxw7vgygg6hqzq479n0pfjizr69wq7ja03a0qh8bma8b9q2mn6f";
+  })
+  (fetchNuGet {
+    pname = "Microsoft.AspNetCore.App.Runtime.win-x64";
+    version = "6.0.22";
+    sha256 = "0ygdqsd312kqpykwb0k2942n45q1w3yn1nia6m1ahf7b74926qb5";
+  })
+  (fetchNuGet {
+    pname = "Microsoft.AspNetCore.App.Runtime.win-x64";
+    version = "7.0.11";
+    sha256 = "05ywwfn5lzx6y999f7gwmablkxi2zvska4sg20ihmjzp3xakcmk0";
+  })
+  (fetchNuGet {
+    pname = "Microsoft.CodeCoverage";
+    version = "17.6.0";
+    sha256 = "02s98d8nwz5mg4mymcr86qdamy71a29g2091xg452czmd3s3x2di";
+  })
+  (fetchNuGet {
+    pname = "Microsoft.NET.Test.Sdk";
+    version = "17.6.0";
+    sha256 = "1bnwpwg7k72z06027ip4yi222863r8sv14ck9nj8h64ckiw2r256";
+  })
+  (fetchNuGet {
+    pname = "Microsoft.NETCore.App.Host.linux-arm64";
+    version = "6.0.22";
+    sha256 = "0gri1gqznm5c8fsb6spqb3j88a3b0br0iy50y66fh4hz9wc4fwzm";
+  })
+  (fetchNuGet {
+    pname = "Microsoft.NETCore.App.Host.linux-arm64";
+    version = "7.0.11";
+    sha256 = "03nkxjn4wq30rw0163rqi8sngfxmcvwgm0wg7sgyb1cdh0q1ai68";
+  })
+  (fetchNuGet {
+    pname = "Microsoft.NETCore.App.Host.linux-x64";
+    version = "6.0.22";
+    sha256 = "0k1i74wn6j7nq0bd8m6jrpl65wda6qc9pglppvz4ybk0n2ab1rbi";
+  })
+  (fetchNuGet {
+    pname = "Microsoft.NETCore.App.Host.linux-x64";
+    version = "7.0.11";
+    sha256 = "12hh69sr4wf8sjcw3q71vky51sn854ffahbq6rgz3njzvbvc0dbj";
+  })
+  (fetchNuGet {
+    pname = "Microsoft.NETCore.App.Host.osx-arm64";
+    version = "6.0.22";
+    sha256 = "0166gwarhhnary19lf80ff33bkx00mkm24f17bc8j6v7g3a7zvq6";
+  })
+  (fetchNuGet {
+    pname = "Microsoft.NETCore.App.Host.osx-x64";
+    version = "6.0.22";
+    sha256 = "038bjwk201p2kzs3jflrkhlnszf7cwalafq0nvs2v8bp7jlnx5ib";
+  })
+  (fetchNuGet {
+    pname = "Microsoft.NETCore.App.Host.osx-x64";
+    version = "7.0.11";
+    sha256 = "1j1k735gkwba93n5yck87wppfpsbny979hppcygwrk81myf3fv03";
+  })
+  (fetchNuGet {
+    pname = "Microsoft.NETCore.App.Host.win-x64";
+    version = "6.0.22";
+    sha256 = "1bjy3zmrmaq97xp0f3nzs3ax330ji632avrfpg8xz4vc5p8s1xpc";
+  })
+  (fetchNuGet {
+    pname = "Microsoft.NETCore.App.Host.win-x64";
+    version = "7.0.11";
+    sha256 = "0ifshdx19bgnbgynbk6iy6gybnxmp63nylrn7068x66hvcavh7kh";
+  })
+  (fetchNuGet {
+    pname = "Microsoft.NETCore.App.Ref";
+    version = "6.0.22";
+    sha256 = "0km8184kma8kgz7iyl3j6apj1n7vskzdhzmq3myy3y36ysqrb4wf";
+  })
+  (fetchNuGet {
+    pname = "Microsoft.NETCore.App.Runtime.linux-arm64";
+    version = "6.0.22";
+    sha256 = "01gbl9dgky4h7ijxryz3527l39v23lkcvk4fs4w91ra4pris2n8p";
+  })
+  (fetchNuGet {
+    pname = "Microsoft.NETCore.App.Runtime.linux-arm64";
+    version = "7.0.11";
+    sha256 = "1gzwc96fs222ddia0k1924cn7gxm2a4anqgcxhmavx56x76wsy6f";
+  })
+  (fetchNuGet {
+    pname = "Microsoft.NETCore.App.Runtime.linux-x64";
+    version = "6.0.22";
+    sha256 = "09gfqdxbh36bjx20fw9k94b9qa9bwffhrq0ldwn834mx31bgrfs8";
+  })
+  (fetchNuGet {
+    pname = "Microsoft.NETCore.App.Runtime.linux-x64";
+    version = "7.0.11";
+    sha256 = "0vxza49wwiia0d3m887yiaprp3xnax2bgzhj5bf080b4ayapzkf9";
+  })
+  (fetchNuGet {
+    pname = "Microsoft.NETCore.App.Runtime.osx-arm64";
+    version = "6.0.22";
+    sha256 = "1x7wclv93q8wp7rip5nwnsxbqcami92yilvzbp0yn42ddkw177ds";
+  })
+  (fetchNuGet {
+    pname = "Microsoft.NETCore.App.Runtime.osx-arm64";
+    version = "7.0.11";
+    sha256 = "15b62hxrpfy19xvyxlyligixxpa9sysfgi47xi4imx5055fhwphh";
+  })
+  (fetchNuGet {
+    pname = "Microsoft.NETCore.App.Runtime.osx-x64";
+    version = "6.0.22";
+    sha256 = "1sq1ygsrpv2sl85wrs8382wgkjic0zylaj1y8kcvhczcmkpk3wr5";
+  })
+  (fetchNuGet {
+    pname = "Microsoft.NETCore.App.Runtime.osx-x64";
+    version = "7.0.11";
+    sha256 = "018qf23b0jixfh3fm74zqaakk01qx6yq21gk2mdn68b0xhnvlzma";
+  })
+  (fetchNuGet {
+    pname = "Microsoft.NETCore.App.Runtime.win-x64";
+    version = "6.0.22";
+    sha256 = "1nn254xv1hi5c4rg38fbfkln3031vv545lv9f4df31i8c1yfzz24";
+  })
+  (fetchNuGet {
+    pname = "Microsoft.NETCore.App.Runtime.win-x64";
+    version = "7.0.11";
+    sha256 = "12xmw2kcpf5rh8sv4y0mqzp917f7q8g4mfh5navqw4jmnxyb26qq";
+  })
+  (fetchNuGet {
+    pname = "Microsoft.NETCore.Platforms";
+    version = "1.1.0";
+    sha256 = "08vh1r12g6ykjygq5d3vq09zylgb84l63k49jc4v8faw9g93iqqm";
+  })
+  (fetchNuGet {
+    pname = "Microsoft.NETCore.Platforms";
+    version = "2.0.0";
+    sha256 = "1fk2fk2639i7nzy58m9dvpdnzql4vb8yl8vr19r2fp8lmj9w2jr0";
+  })
+  (fetchNuGet {
+    pname = "Microsoft.TestPlatform.ObjectModel";
+    version = "17.6.0";
+    sha256 = "1rz22chnis11dwjrqrcvvmfw80fi2a7756a7ahwy6jlnr250zr61";
+  })
+  (fetchNuGet {
+    pname = "Microsoft.TestPlatform.TestHost";
+    version = "17.6.0";
+    sha256 = "16vpicp4q2kbpgr3qwpsxg7srabxqszx23x6smjvvrvz7qmr5v8i";
+  })
+  (fetchNuGet {
+    pname = "NETStandard.Library";
+    version = "2.0.0";
+    sha256 = "1bc4ba8ahgk15m8k4nd7x406nhi0kwqzbgjk2dmw52ss553xz7iy";
+  })
+  (fetchNuGet {
+    pname = "Newtonsoft.Json";
+    version = "13.0.1";
+    sha256 = "0fijg0w6iwap8gvzyjnndds0q4b8anwxxvik7y8vgq97dram4srb";
+  })
+  (fetchNuGet {
+    pname = "NuGet.Common";
+    version = "6.6.1";
+    sha256 = "1q7k5rqwchxgs5pnrn22d1rkdb7l2qblvsb9hy046ll69i71vv45";
+  })
+  (fetchNuGet {
+    pname = "NuGet.Configuration";
+    version = "6.6.1";
+    sha256 = "0pw4ikd8784iya920wxigacqn5g2v0zlpwxjlswyq5mnj2ha7gpk";
+  })
+  (fetchNuGet {
+    pname = "NuGet.Frameworks";
+    version = "5.11.0";
+    sha256 = "0wv26gq39hfqw9md32amr5771s73f5zn1z9vs4y77cgynxr73s4z";
+  })
+  (fetchNuGet {
+    pname = "NuGet.Frameworks";
+    version = "6.6.1";
+    sha256 = "1zq79mklzq7qyiyhcv3w8pznw6rq1ddcl8fvy7j1c6n8qh3mglhx";
+  })
+  (fetchNuGet {
+    pname = "NuGet.Packaging";
+    version = "6.6.1";
+    sha256 = "1lmx8kgpg220q8kic4wm8skccj53cbkdqggirq9js34gnxxi9b88";
+  })
+  (fetchNuGet {
+    pname = "NuGet.Protocol";
+    version = "6.6.1";
+    sha256 = "01n8cw114npvzfk3m3803lb8plk0wm1zg496gpq9az8hw20nmd8g";
+  })
+  (fetchNuGet {
+    pname = "NuGet.Versioning";
+    version = "6.6.1";
+    sha256 = "0n2p05y8ciw6jc5s238rlnx6q4dgxvm14v06pcd84ji5j1iirc30";
+  })
+  (fetchNuGet {
+    pname = "NUnit";
+    version = "3.13.3";
+    sha256 = "0wdzfkygqnr73s6lpxg5b1pwaqz9f414fxpvpdmf72bvh4jaqzv6";
+  })
+  (fetchNuGet {
+    pname = "NUnit.Analyzers";
+    version = "3.6.1";
+    sha256 = "16dw5375k2wyhiw9x387y7pjgq6zms30y036qb8z7idx4lxw9yi9";
+  })
+  (fetchNuGet {
+    pname = "NUnit3TestAdapter";
+    version = "4.4.2";
+    sha256 = "1n2jlc16vjdd81cb1by4qbp75sq73zsjz5w3zc61ssmbdci1q2ri";
+  })
+  (fetchNuGet {
+    pname = "RestEase";
+    version = "1.6.4";
+    sha256 = "1mvi3nbrr450g3fgd1y4wg3bwl9k1agyjfd9wdkqk12714bsln8l";
+  })
+  (fetchNuGet {
+    pname = "System.Formats.Asn1";
+    version = "5.0.0";
+    sha256 = "1axc8z0839yvqi2cb63l73l6d9j6wd20lsbdymwddz9hvrsgfwpn";
+  })
+  (fetchNuGet {
+    pname = "System.IO.Abstractions";
+    version = "4.2.13";
+    sha256 = "0s784iphsmj4vhkrzq9q3w39vsn76w44zclx3hsygsw458zbyh4y";
+  })
+  (fetchNuGet {
+    pname = "System.IO.FileSystem.AccessControl";
+    version = "4.5.0";
+    sha256 = "1gq4s8w7ds1sp8f9wqzf8nrzal40q5cd2w4pkf4fscrl2ih3hkkj";
+  })
+  (fetchNuGet {
+    pname = "System.Reflection.Metadata";
+    version = "1.6.0";
+    sha256 = "1wdbavrrkajy7qbdblpbpbalbdl48q3h34cchz24gvdgyrlf15r4";
+  })
+  (fetchNuGet {
+    pname = "System.Runtime.CompilerServices.Unsafe";
+    version = "6.0.0";
+    sha256 = "0qm741kh4rh57wky16sq4m0v05fxmkjjr87krycf5vp9f0zbahbc";
+  })
+  (fetchNuGet {
+    pname = "System.Security.AccessControl";
+    version = "4.5.0";
+    sha256 = "1wvwanz33fzzbnd2jalar0p0z3x0ba53vzx1kazlskp7pwyhlnq0";
+  })
+  (fetchNuGet {
+    pname = "System.Security.Cryptography.Cng";
+    version = "5.0.0";
+    sha256 = "06hkx2za8jifpslkh491dfwzm5dxrsyxzj5lsc0achb6yzg4zqlw";
+  })
+  (fetchNuGet {
+    pname = "System.Security.Cryptography.Pkcs";
+    version = "5.0.0";
+    sha256 = "0hb2mndac3xrw3786bsjxjfh19bwnr991qib54k6wsqjhjyyvbwj";
+  })
+  (fetchNuGet {
+    pname = "System.Security.Cryptography.ProtectedData";
+    version = "4.4.0";
+    sha256 = "1q8ljvqhasyynp94a1d7jknk946m20lkwy2c3wa8zw2pc517fbj6";
+  })
+  (fetchNuGet {
+    pname = "System.Security.Principal.Windows";
+    version = "4.5.0";
+    sha256 = "0rmj89wsl5yzwh0kqjgx45vzf694v9p92r4x4q6yxldk1cv1hi86";
+  })
+  (fetchNuGet {
+    pname = "System.Text.Encodings.Web";
+    version = "6.0.0";
+    sha256 = "06n9ql3fmhpjl32g3492sj181zjml5dlcc5l76xq2h38c4f87sai";
+  })
+  (fetchNuGet {
+    pname = "System.Text.Encodings.Web";
+    version = "7.0.0";
+    sha256 = "1151hbyrcf8kyg1jz8k9awpbic98lwz9x129rg7zk1wrs6vjlpxl";
+  })
+  (fetchNuGet {
+    pname = "System.Text.Json";
+    version = "6.0.0";
+    sha256 = "1si2my1g0q0qv1hiqnji4xh9wd05qavxnzj9dwgs23iqvgjky0gl";
+  })
+  (fetchNuGet {
+    pname = "System.Text.Json";
+    version = "7.0.3";
+    sha256 = "0zjrnc9lshagm6kdb9bdh45dmlnkpwcpyssa896sda93ngbmj8k9";
+  })
+]
diff --git a/nix/fetchDeps.sh b/nix/fetchDeps.sh
new file mode 100755
index 0000000..e15b822
--- /dev/null
+++ b/nix/fetchDeps.sh
@@ -0,0 +1,73 @@
+#!/bin/bash
+
+# This file was adapted from
+# https://github.com/NixOS/nixpkgs/blob/b981d811453ab84fb3ea593a9b33b960f1ab9147/pkgs/build-support/dotnet/build-dotnet-module/default.nix#L173
+set -euo pipefail
+export PATH="@binPath@"
+for arg in "$@"; do
+    case "$arg" in
+        --keep-sources|-k)
+            keepSources=1
+            shift
+            ;;
+        --help|-h)
+            echo "usage: $0 [--keep-sources] [--help] <output path>"
+            echo "    <output path>   The path to write the lockfile to. A temporary file is used if this is not set"
+            echo "    --keep-sources  Don't remove temporary directories upon exit, useful for debugging"
+            echo "    --help          Show this help message"
+            exit
+            ;;
+    esac
+done
+tmp=$(mktemp -td "@pname@-tmp-XXXXXX")
+export tmp
+HOME=$tmp/home
+exitTrap() {
+    test -n "${ranTrap-}" && return
+    ranTrap=1
+    if test -n "${keepSources-}"; then
+        echo -e "Path to the source: $tmp/src\nPath to the fake home: $tmp/home"
+    else
+        rm -rf "$tmp"
+    fi
+    # Since mktemp is used this will be empty if the script didnt succesfully complete
+    if ! test -s "$depsFile"; then
+      rm -rf "$depsFile"
+    fi
+}
+trap exitTrap EXIT INT TERM
+dotnetRestore() {
+    local -r project="${1-}"
+    local -r rid="$2"
+    dotnet restore "${project-}" \
+        -p:ContinuousIntegrationBuild=true \
+        -p:Deterministic=true \
+        --packages "$tmp/nuget_pkgs" \
+        --runtime "$rid" \
+        --no-cache \
+        --force
+}
+declare -a projectFiles=( @projectFiles@ )
+declare -a testProjectFiles=( @testProjectFiles@ )
+export DOTNET_NOLOGO=1
+export DOTNET_CLI_TELEMETRY_OPTOUT=1
+depsFile=$(realpath "${1:-$(mktemp -t "@pname@-deps-XXXXXX.nix")}")
+mkdir -p "$tmp/nuget_pkgs"
+storeSrc="@storeSrc@"
+src="$tmp/src"
+cp -rT "$storeSrc" "$src"
+chmod -R +w "$src"
+cd "$src"
+echo "Restoring project..."
+rids=("@rids@")
+for rid in "${rids[@]}"; do
+    (( ${#projectFiles[@]} == 0 )) && dotnetRestore "" "$rid"
+    for project in "${projectFiles[@]-}" "${testProjectFiles[@]-}"; do
+        dotnetRestore "$project" "$rid"
+    done
+done
+echo "Successfully restored project"
+echo "Writing lockfile..."
+echo -e "# This file was automatically generated by passthru.fetch-deps.\n# Please don't edit it manually, your changes might get overwritten!\n" > "$depsFile"
+nuget-to-nix "$tmp/nuget_pkgs" "@packages@" >> "$depsFile"
+echo "Successfully wrote lockfile to $depsFile"