Add a CLI and some light testing

Main.lean

@@ -4,7 +4,80 @@ Released under Apache 2.0 license as described in the file LICENSE.
 Authors: Jean-Baptiste Tristan, Paul Govereau, Sean McLaughlin
 -/
 
+import Init.System.IO
+import Cli
 import TensorLib
 
-def main (_args : List String) : IO UInt32 :=
+open Cli
+open TensorLib
+
+def format (p : Parsed) : IO UInt32 := do
+  let shape : Shape := Shape.mk (p.variableArgsAs! Nat).toList
+  IO.println s!"Got shape {shape}"
+  let range := Tensor.Element.arange BV16 shape.count
+  let v := range.reshape! shape
+  let s := v.format BV16
+  IO.println s
   return 0
+
+def formatCmd := `[Cli|
+  "format" VIA format;
+  "Test formatting"
+
+  ARGS:
+    ...shape : Nat;      "shape to test"
+]
+
+def parseNpy (p : Parsed) : IO UInt32 := do
+  let file := p.positionalArg! "input" |>.as! String
+  IO.println s!"Parsing {file}..."
+  let v <- Npy.parseFile file
+  IO.println (repr v)
+  if p.hasFlag "write" then do
+    let new := (System.FilePath.mk file).addExtension "new"
+    IO.println s!"Writing copy to {new}"
+    let _ <- v.save! new
+    -- TensorLib.Npy.save! (arr : Ndarray) (file : System.FilePath) : IO Unit
+  return 0
+
+def parseNpyCmd := `[Cli|
+  "parse-npy" VIA parseNpy;
+  "Parse a .npy file and pretty print the contents"
+
+  FLAGS:
+    write; "Also write the result back to `input`.new to test saving arrays to disk"
+
+  ARGS:
+    input : String;      ".npy file to parse"
+]
+
+def runTests (_ : Parsed) : IO UInt32 := do
+  -- Just pytest for now, but add Lean tests here as well
+  -- pytest will exit nonzero on it's own, so we don't need to check exit code
+  IO.println "Running PyTest..."
+  let output <- IO.Process.output { cmd := "pytest" }
+  IO.println s!"stdout: {output.stdout}"
+  IO.println s!"stderr: {output.stderr}"
+  return output.exitCode
+
+def runTestsCmd := `[Cli|
+  "test" VIA runTests;
+  "Run tests"
+]
+
+def tensorlibCmd : Cmd := `[Cli|
+  tensorlib NOOP; ["0.0.1"]
+  "TensorLib is a NumPy-like library for Lean."
+
+  SUBCOMMANDS:
+    formatCmd;
+    parseNpyCmd;
+    runTestsCmd
+]
+
+def main (args : List String) : IO UInt32 :=
+  if args.isEmpty then do
+    IO.println tensorlibCmd.help
+    return 0
+  else do
+   tensorlibCmd.validate args

TensorLib/Basic.lean

@@ -13,3 +13,4 @@ import TensorLib.Tensor
 import TensorLib.Index
 import TensorLib.Mgrid
 import TensorLib.Ufunc
+import TensorLib.Test

TensorLib/Test.lean

@@ -0,0 +1,57 @@
+/-
+Copyright (c) 2024 Amazon.com, Inc. or its affiliates. All Rights Reserved.
+Released under Apache 2.0 license as described in the file LICENSE.
+Authors: Jean-Baptiste Tristan, Paul Govereau, Sean McLaughlin
+-/
+
+import Init.System.IO
+import TensorLib.Tensor
+
+namespace TensorLib
+
+section Test
+
+private def DEBUG := false
+private def debugPrint {a : Type} [Repr a] (s : a) : IO Unit := if DEBUG then IO.print (Std.Format.pretty (repr s)) else return ()
+private def debugPrintln {a : Type} [Repr a] (s : a) : IO Unit := do
+  debugPrint s
+  if DEBUG then IO.print "\n" else return ()
+
+-- Caller must remove the temp file
+private def saveNumpyArray (expr : String) : IO System.FilePath := do
+  let (_root_, file) <- IO.FS.createTempFile
+  let expr := s!"import numpy as np; x = {expr}; np.save('{file}', x)"
+  let output <- IO.Process.output { cmd := "/usr/bin/env", args := ["python3", "-c", expr].toArray }
+  let _ <- debugPrintln output.stdout
+  let _ <- debugPrintln output.stderr
+  -- `np.save` appends `.npy` to the file
+  return file.addExtension "npy"
+
+private def testTensorElementBV (n : Nat) [Tensor.Element (BitVec n)] (dtype : String) : IO Bool := do
+  let file <- saveNumpyArray s!"np.arange(20, dtype='{dtype}').reshape(5, 4)"
+  let npy <- Npy.parseFile file
+  let arr <- IO.ofExcept (Tensor.ofNpy npy)
+  let _ <- debugPrintln file
+  let _ <- debugPrintln arr
+  let _ <- IO.FS.removeFile file
+  let expected : List (BitVec n) := (List.range 20).map (BitVec.ofNat n)
+  let mut actual := []
+  for i in [0:20] do
+    match Tensor.Element.getPosition arr i with
+    | .error msg => IO.throwServerError msg
+    | .ok v => actual := v :: actual
+  actual := actual.reverse
+  let _ <- debugPrintln actual
+  return expected == actual
+
+-- Sketchy perhaps, but seems to work for testing
+private def ioBool (x : IO Bool) : Bool := match x.run () with
+| .error _ _ => false
+| .ok b _ => b
+
+#guard ioBool (testTensorElementBV 16 "uint16")
+#guard ! ioBool (testTensorElementBV 32 "uint16")
+#guard ioBool (testTensorElementBV 32 "uint32")
+#guard ! ioBool (testTensorElementBV 32 "uint64")
+
+end Test