Add range with keyword arguments (#511)

README.md

@@ -278,6 +278,7 @@ Currently, the `@compat` macro supports the following syntaxes:
 
 * `Compat.IOBuffer` supporting keyword arguments ([#25873]).
 
+* `Compat.range` supporting keyword arguments ([#25896]).
 
 ## Renaming
 
@@ -370,6 +371,8 @@ Currently, the `@compat` macro supports the following syntaxes:
 * `DevNull`, `STDIN`, `STDOUT` and `STDERR` are now `devnull`, `stdin`, `stdout` and
   `stderr` respectively ([#25959]).
 
+* `LinSpace` is now `LinRange` ([#25896]).
+
 ## New macros
 
 * `@__DIR__` has been added ([#18380])
@@ -574,5 +577,6 @@ includes this fix. Find the minimum version from there.
 [#25780]: https://github.com/JuliaLang/julia/issues/25780
 [#25819]: https://github.com/JuliaLang/julia/issues/25819
 [#25873]: https://github.com/JuliaLang/julia/issues/25873
+[#25896]: https://github.com/JuliaLang/julia/issues/25896
 [#25990]: https://github.com/JuliaLang/julia/issues/25990
 [#26089]: https://github.com/JuliaLang/julia/issues/26089

src/Compat.jl

@@ -1620,6 +1620,35 @@ if VERSION < v"0.7.0-DEV.3734"
     end
 end
 
+@static if VERSION < v"0.7.0-DEV.3986"
+    const LinRange = Base.LinSpace
+    export LinRange
+
+    function range(start; step=nothing, stop=nothing, length=nothing)
+        have_step = step !== nothing
+        have_stop = stop !== nothing
+        have_length = length !== nothing
+
+        if !(have_stop || have_length)
+            throw(ArgumentError("At least one of `length` or `stop` must be specified"))
+        elseif have_step && have_stop && have_length
+            throw(ArgumentError("Too many arguments specified; try passing only one of `stop` or `length`"))
+        elseif start === nothing
+            throw(ArgumentError("Can't start a range at `nothing`"))
+        end
+
+        if have_stop && !have_length
+            return have_step ? (start:step:stop) : (start:stop)
+        elseif have_length && !have_stop
+            return have_step ? Base.range(start, step, length) : Base.range(start, length)
+        elseif !have_step
+            return linspace(start, stop, length)
+        end
+    end
+else
+    import Base: range, LinRange
+end
+
 include("deprecated.jl")
 
 end # module Compat

test/runtests.jl

@@ -1450,4 +1450,14 @@ let buf = Compat.IOBuffer(sizehint=20)
     @test String(take!(buf)) == "Hello world.\n"
 end
 
+# 0.7.0-DEV.3986
+@test_throws ArgumentError Compat.range(1)
+@test_throws ArgumentError Compat.range(nothing)
+@test_throws ArgumentError Compat.range(1, step=1)
+@test_throws ArgumentError Compat.range(1, step=1, stop=4, length=3)
+@test Compat.range(2, step=2, stop=8) == 2:2:8
+@test Compat.range(2, stop=8) == 2:8
+@test Compat.range(2, step=2, length=8) == 2:2:16
+@test Compat.range(1.0, stop=2.0, length=3) == 1.0:0.5:2.0
+
 nothing