WIP: call nuget restore

On legacy non-Windows platforms use make.fsx for build,
that will download nuget and call nuget restore.

.github/workflows/CI.yml

@@ -213,7 +213,7 @@ jobs:
     - name: configure
       run: ./configure.sh
     - name: build in DEBUG mode
-      run: make
+      run: fsharpi --define:LEGACY_FRAMEWORK scripts/make.fsx
     - name: run unit tests
       run: fsharpi --define:LEGACY_FRAMEWORK scripts/runUnitTests.fsx
 
@@ -255,7 +255,7 @@ jobs:
     - name: configure
       run: ./configure.sh
     - name: build in DEBUG mode
-      run: make
+      run: fsharpi --define:LEGACY_FRAMEWORK scripts/make.fsx
     - name: run unit tests
       run: fsharpi --define:LEGACY_FRAMEWORK scripts/runUnitTests.fsx
 
@@ -353,7 +353,7 @@ jobs:
     - name: configure
       run: ./configure.sh
     - name: build in DEBUG mode
-      run: make
+      run: fsharpi --define:LEGACY_FRAMEWORK scripts/make.fsx
     - name: run unit tests
       run: fsharpi --define:LEGACY_FRAMEWORK scripts/runUnitTests.fsx
 
@@ -395,7 +395,7 @@ jobs:
     - name: configure
       run: ./configure.sh
     - name: build in DEBUG mode
-      run: make
+      run: fsharpi --define:LEGACY_FRAMEWORK scripts/make.fsx
     - name: run unit tests
       run: fsharpi --define:LEGACY_FRAMEWORK scripts/runUnitTests.fsx
 

scripts/make.fsx

@@ -85,8 +85,67 @@ let FindBuildTool() : string * string =
     match Misc.GuessPlatform() with
     | Misc.Platform.Linux
     | Misc.Platform.Mac ->
-        failwith
-            "cannot find buildTool because this script is not ready for Unix yet"
+        let buildConfigFileName = "build.config"
+
+        let buildConfigContents =
+            let buildConfig =
+                Path.Combine(RootDir.FullName, buildConfigFileName)
+                |> FileInfo
+
+            if not(buildConfig.Exists) then
+                let configureLaunch =
+                    match Misc.GuessPlatform() with
+                    | Misc.Platform.Windows -> ".\\configure.bat"
+                    | _ -> "./configure.sh"
+
+                Console.Error.WriteLine(
+                    sprintf
+                        "ERROR: configure hasn't been run yet, run %s first"
+                        configureLaunch
+                )
+
+                Environment.Exit 1
+
+            let configFileLines = File.ReadAllLines buildConfig.FullName
+
+            let skipBlankLines line =
+                not <| String.IsNullOrWhiteSpace line
+
+            let splitLineIntoKeyValueTuple(line: string) =
+                let pair =
+                    line.Split([| '=' |], StringSplitOptions.RemoveEmptyEntries)
+
+                if pair.Length <> 2 then
+                    failwithf
+                        "All lines in '%s' must conform to key=value format, but got: '%s'. All lines: \n%s"
+                        buildConfigFileName
+                        line
+                        (File.ReadAllText buildConfig.FullName)
+
+                pair.[0], pair.[1]
+
+            let buildConfigContents =
+                configFileLines
+                |> Array.filter skipBlankLines
+                |> Array.map splitLineIntoKeyValueTuple
+                |> Map.ofArray
+
+            buildConfigContents
+
+        let maybeBuildTool = Map.tryFind "BuildTool" buildConfigContents
+
+        match maybeBuildTool with
+        | None ->
+            failwith
+                "A BuildTool should have been chosen by the configure script, please report this bug"
+        | Some "dotnet" ->
+#if LEGACY_FRAMEWORK
+            failwith
+                "'dotnet' shouldn't be the build tool when using legacy framework, please report this bug"
+#endif
+            "dotnet", "build"
+        | Some otherBuildTool ->
+            otherBuildTool, String.Empty
     | Misc.Platform.Windows ->
 #if !LEGACY_FRAMEWORK
         "dotnet", "build"
@@ -156,6 +215,9 @@ let JustBuild binaryConfig =
 #else
     let solFile = "fsx-legacy.sln"
 
+    if not NugetExe.Exists then
+        Network.DownloadNugetExe NugetExe
+
     Network.RunNugetCommand
         NugetExe
         (sprintf "restore %s" solFile)
@@ -179,7 +241,12 @@ let MakeAll() =
     buildConfig
 
 let programFiles =
-    Environment.GetEnvironmentVariable "ProgramW6432" |> DirectoryInfo
+    let programFilesPath = Environment.GetEnvironmentVariable "ProgramW6432"
+
+    if isNull programFilesPath then // hack for unix platforms so that script doesn't crash
+        DirectoryInfo "/"
+    else
+        DirectoryInfo programFilesPath
 
 let fsxInstallationDir =
     Path.Combine(programFiles.FullName, "fsx") |> DirectoryInfo