[WIP] PyO3 walking skeleton for Python

.github/workflows/build.yml

@@ -145,17 +145,15 @@ jobs:
       - name: Setup dotnet tools
         run: dotnet tool restore
 
-      # - name: Check F# formatting (fantomas)
-      #   run: dotnet fantomas src/Fable.Transforms/Python --check
-
       - name: Set up Python ${{ matrix.python-version }}
         uses: actions/setup-python@v2
         with:
           python-version: ${{ matrix.python-version }}
 
       - name: Install poetry
         run: |
-          pip install poetry
+          pipx install poetry
+          pipx install maturin
 
       - name: Fable Library - Python (linux)
         if: matrix.platform == 'ubuntu-latest'

pyproject.toml

@@ -16,6 +16,7 @@ python-dateutil = "^2.9.0"
 [tool.poetry.dev-dependencies]
 pytest = "^8.1.1"
 ruff = "^0.3.4"
+maturin = "^1.5.0"
 
 [tool.pyright]
 reportMissingTypeStubs = false

src/Fable.Build/FableLibrary/Core.fs

@@ -49,6 +49,23 @@ type BuildFableLibrary
     abstract member CopyStage: unit -> unit
     default _.CopyStage() = ()
 
+    abstract member FableBuildStage: unit -> unit
+
+    default this.FableBuildStage() =
+        let args =
+            CmdLine.appendRaw sourceDir
+            >> CmdLine.appendPrefix "--outDir" outDir
+            >> CmdLine.appendPrefix "--fableLib" fableLibArg
+            >> CmdLine.appendPrefix "--lang" language
+            >> CmdLine.appendPrefix "--exclude" "Fable.Core"
+            >> CmdLine.appendPrefix "--define" "FABLE_LIBRARY"
+            >> CmdLine.appendRaw "--noCache"
+            // Target implementation can require additional arguments
+            >> this.FableArgsBuilder
+
+        Command.Fable(args)
+
+
     member this.Run(?skipIfExist: bool) =
         let skipIfExist = defaultArg skipIfExist false
 
@@ -63,19 +80,7 @@ type BuildFableLibrary
                 Directory.Delete(buildDir, true)
 
             Calm "Building Fable.Library" |> toConsole
-
-            let args =
-                CmdLine.appendRaw sourceDir
-                >> CmdLine.appendPrefix "--outDir" outDir
-                >> CmdLine.appendPrefix "--fableLib" fableLibArg
-                >> CmdLine.appendPrefix "--lang" language
-                >> CmdLine.appendPrefix "--exclude" "Fable.Core"
-                >> CmdLine.appendPrefix "--define" "FABLE_LIBRARY"
-                >> CmdLine.appendRaw "--noCache"
-                // Target implementation can require additional arguments
-                >> this.FableArgsBuilder
-
-            Command.Fable(args)
+            this.FableBuildStage()
 
             Calm "Copy stage" |> toConsole
             this.CopyStage()

src/Fable.Build/FableLibrary/Python.fs

@@ -4,6 +4,7 @@ open System.IO
 open Fake.IO
 open Build.Utils
 open SimpleExec
+open BlackFox.CommandLine
 
 type BuildFableLibraryPython() =
     inherit
@@ -15,17 +16,43 @@ type BuildFableLibraryPython() =
             Path.Combine("temp", "fable-library-py", "fable_library")
         )
 
+    override this.FableBuildStage() =
+        let args =
+            CmdLine.appendRaw this.SourceDir
+            >> CmdLine.appendPrefix "--outDir" this.OutDir
+            >> CmdLine.appendPrefix "--fableLib" "."
+            >> CmdLine.appendPrefix "--lang" this.Language
+            >> CmdLine.appendPrefix "--exclude" "Fable.Core"
+            >> CmdLine.appendPrefix "--define" "FABLE_LIBRARY"
+            >> CmdLine.appendRaw "--noCache"
+            // Target implementation can require additional arguments
+            >> this.FableArgsBuilder
+
+        Command.Fable(args)
+
+
     override this.CopyStage() =
         // // Copy all *.rs files to the build directory
         Directory.GetFiles(this.LibraryDir, "*") |> Shell.copyFiles this.BuildDir
 
         Directory.GetFiles(this.SourceDir, "*.py") |> Shell.copyFiles this.OutDir
+        // Python extension modules
+        Directory.GetFiles(Path.Combine(this.SourceDir, "core"), "*")
+        |> Shell.copyFiles (Path.Combine(this.OutDir, "core"))
+        // Rust sources for building the extension modules
+        Directory.GetFiles(Path.Combine(this.LibraryDir, "src"), "*")
+        |> Shell.copyFiles (Path.Combine(this.BuildDir, "src"))
+
 
     override this.PostFableBuildStage() =
         // Fix issues with Fable .fsproj not supporting links
         let linkedFileFolder =
             Path.Combine(this.BuildDir, "fable_library", "fable-library-ts")
 
+        Command.Run("poetry", "config virtualenvs.in-project true", this.BuildDir)
+        Command.Run("poetry", "install", this.BuildDir) // Maturn needs a local virtual environment
+        Command.Run("maturin", "develop --release", this.BuildDir)
+
         Directory.GetFiles(linkedFileFolder, "*") |> Shell.copyFiles this.OutDir
 
         Shell.deleteDir (this.BuildDir </> "fable_library/fable-library-ts")