Change some truncrank args to kwargs

Project.toml

@@ -1,7 +1,7 @@
 name = "MatrixAlgebraKit"
 uuid = "6c742aac-3347-4629-af66-fc926824e5e4"
 authors = ["Jutho <[email protected]> and contributors"]
-version = "0.1.2"
+version = "0.2.0"
 
 [deps]
 LinearAlgebra = "37e2e46d-f89d-539d-b4ee-838fcccc9c8e"

src/implementations/truncation.jl

@@ -69,11 +69,11 @@ TruncationKeepBelow(atol::Real, rtol::Real) = TruncationKeepBelow(promote(atol,
 
 # TODO: better names for these functions of the above types
 """
-    truncrank(howmany::Int, by=abs, rev=true)
+    truncrank(howmany::Int; by=abs, rev=true)
 
 Truncation strategy to keep the first `howmany` values when sorted according to `by` or the last `howmany` if `rev` is true.
 """
-truncrank(howmany::Int, by=abs, rev=true) = TruncationKeepSorted(howmany, by, rev)
+truncrank(howmany::Int; by=abs, rev=true) = TruncationKeepSorted(howmany, by, rev)
 
 """
     trunctol(atol::Real)

test/truncate.jl

@@ -2,7 +2,7 @@ using MatrixAlgebraKit
 using Test
 using TestExtras
 using MatrixAlgebraKit: NoTruncation, TruncationIntersection, TruncationKeepAbove,
-                        TruncationStrategy
+                        TruncationStrategy, findtruncated
 
 @testset "truncate" begin
     trunc = @constinferred TruncationStrategy()
@@ -26,4 +26,9 @@ using MatrixAlgebraKit: NoTruncation, TruncationIntersection, TruncationKeepAbov
     @test trunc == truncrank(10) & TruncationKeepAbove(1e-2, 1e-3)
     @test trunc.components[1] == truncrank(10)
     @test trunc.components[2] == TruncationKeepAbove(1e-2, 1e-3)
+
+    values = [1, 0.9, 0.5, 0.3, 0.01]
+    @test @constinferred(findtruncated(values, truncrank(2))) == [1, 2]
+    @test @constinferred(findtruncated(values, truncrank(2; rev=false))) == [5, 4]
+    @test @constinferred(findtruncated(values, truncrank(2; by=-))) == [5, 4]
 end