Deprecate is_<os> functions in favor of Sys.is<os>

This makes them consistent with the vast majority of Base predicates,
which simply prefix with `is` rather than `is_`. It also moves to
requiring the `Sys.` prefix, which helps explain the intent behind the
function names.

NEWS.md

@@ -160,6 +160,11 @@ Deprecated or removed
   * `InexactError` now takes arguments: `InexactError(func::Symbol,
     type, -3)` now prints as `ERROR: InexactError: func(type, -3)`. ([#20005])
 
+  * The operating system identification functions: `is_linux`, `is_bsd`, `is_apple`, `is_unix`,
+    and `is_windows`, have been deprecated in favor of `Sys.islinux`, `Sys.isbsd`, `Sys.isapple`,
+    `Sys.isunix`, and `Sys.iswindows`, respectively ([#22182]).
+
+
 Julia v0.6.0 Release Notes
 ==========================
 
@@ -954,6 +959,7 @@ Command-line option changes
 [#22038]: https://github.com/JuliaLang/julia/issues/22038
 [#22062]: https://github.com/JuliaLang/julia/issues/22062
 [#22064]: https://github.com/JuliaLang/julia/issues/22064
+[#22182]: https://github.com/JuliaLang/julia/issues/22182
 [#22187]: https://github.com/JuliaLang/julia/issues/22187
 [#22188]: https://github.com/JuliaLang/julia/issues/22188
 [#22224]: https://github.com/JuliaLang/julia/issues/22224

base/c.jl

@@ -18,7 +18,8 @@ Equivalent to the native `char` c-type.
 """
 Cchar
 
-if is_windows()
+# The ccall here is equivalent to Sys.iswindows(), but that's not defined yet
+@static if ccall(:jl_get_UNAME, Any, ()) === :NT
     const Clong = Int32
     const Culong = UInt32
     const Cwchar_t = UInt16
@@ -49,7 +50,7 @@ Equivalent to the native `wchar_t` c-type ([`Int32`](@ref)).
 """
 Cwchar_t
 
-if !is_windows()
+@static if ccall(:jl_get_UNAME, Any, ()) !== :NT
     const sizeof_mode_t = ccall(:jl_sizeof_mode_t, Cint, ())
     if sizeof_mode_t == 2
         const Cmode_t = Int16
@@ -118,7 +119,7 @@ end
 # symbols are guaranteed not to contain embedded NUL
 convert(::Type{Cstring}, s::Symbol) = Cstring(unsafe_convert(Ptr{Cchar}, s))
 
-if is_windows()
+@static if ccall(:jl_get_UNAME, Any, ()) === :NT
 """
     Base.cwstring(s)
 

base/client.jl

@@ -102,15 +102,15 @@ function repl_cmd(cmd, out)
                 end
                 cd(ENV["OLDPWD"])
             else
-                cd(@static is_windows() ? dir : readchomp(`$shell -c "echo $(shell_escape(dir))"`))
+                cd(@static Sys.iswindows() ? dir : readchomp(`$shell -c "echo $(shell_escape(dir))"`))
             end
         else
             cd()
         end
         ENV["OLDPWD"] = new_oldpwd
         println(out, pwd())
     else
-        run(ignorestatus(@static is_windows() ? cmd : (isa(STDIN, TTY) ? `$shell -i -c "$(shell_wrap_true(shell_name, cmd))"` : `$shell -c "$(shell_wrap_true(shell_name, cmd))"`)))
+        run(ignorestatus(@static Sys.iswindows() ? cmd : (isa(STDIN, TTY) ? `$shell -i -c "$(shell_wrap_true(shell_name, cmd))"` : `$shell -c "$(shell_wrap_true(shell_name, cmd))"`)))
     end
     nothing
 end
@@ -390,7 +390,7 @@ function _start()
                 global is_interactive |= !isa(STDIN, Union{File, IOStream})
                 color_set || (global have_color = false)
             else
-                term = Terminals.TTYTerminal(get(ENV, "TERM", @static is_windows() ? "" : "dumb"), STDIN, STDOUT, STDERR)
+                term = Terminals.TTYTerminal(get(ENV, "TERM", @static Sys.iswindows() ? "" : "dumb"), STDIN, STDOUT, STDERR)
                 global is_interactive = true
                 color_set || (global have_color = Terminals.hascolor(term))
                 quiet || REPL.banner(term,term)

base/dSFMT.jl

@@ -163,7 +163,7 @@ end
 
 ## Windows entropy
 
-if is_windows()
+if Sys.iswindows()
     function win32_SystemFunction036!(a::Array)
         ccall((:SystemFunction036, :Advapi32), stdcall, UInt8, (Ptr{Void}, UInt32), a, sizeof(a))
     end

base/datafmt.jl

@@ -120,7 +120,7 @@ readdlm_auto(input::IO, dlm::Char, T::Type, eol::Char, auto::Bool; opts...) =
     readdlm_string(readstring(input), dlm, T, eol, auto, val_opts(opts))
 function readdlm_auto(input::AbstractString, dlm::Char, T::Type, eol::Char, auto::Bool; opts...)
     optsd = val_opts(opts)
-    use_mmap = get(optsd, :use_mmap, is_windows() ? false : true)
+    use_mmap = get(optsd, :use_mmap, Sys.iswindows() ? false : true)
     fsz = filesize(input)
     if use_mmap && fsz > 0 && fsz < typemax(Int)
         a = open(input, "r") do f

base/deprecated.jl

@@ -1570,6 +1570,13 @@ end
 # nfields(::Type) deprecation in builtins.c: update nfields tfunc in inference.jl when it is removed.
 # also replace `_nfields` with `nfields` in summarysize.c when this is removed.
 
+# PR #22182
+@deprecate is_apple   Sys.isapple
+@deprecate is_bsd     Sys.isbsd
+@deprecate is_linux   Sys.islinux
+@deprecate is_unix    Sys.isunix
+@deprecate is_windows Sys.iswindows
+
 # END 0.7 deprecations
 
 # BEGIN 1.0 deprecations

base/distributed/cluster.jl

@@ -975,7 +975,7 @@ end
 function disable_nagle(sock)
     # disable nagle on all OSes
     ccall(:uv_tcp_nodelay, Cint, (Ptr{Void}, Cint), sock.handle, 1)
-    @static if is_linux()
+    @static if Sys.islinux()
         # tcp_quickack is a linux only option
         if ccall(:jl_tcp_quickack, Cint, (Ptr{Void}, Cint), sock.handle, 1) < 0
             warn_once("Networking unoptimized ( Error enabling TCP_QUICKACK : ", Libc.strerror(Libc.errno()), " )")

base/distributed/managers.jl

@@ -460,7 +460,7 @@ function socket_reuse_port()
         s = TCPSocket(delay = false)
 
         # Some systems (e.g. Linux) require the port to be bound before setting REUSEPORT
-        bind_early = is_linux()
+        bind_early = Sys.islinux()
 
         bind_early && bind_client_port(s)
         rc = ccall(:jl_tcp_reuseport, Int32, (Ptr{Void},), s.handle)

base/env.jl

@@ -1,6 +1,6 @@
 # This file is a part of Julia. License is MIT: https://julialang.org/license
 
-if is_windows()
+if Sys.iswindows()
     const ERROR_ENVVAR_NOT_FOUND = UInt32(203)
 
     _getenvlen(var::Vector{UInt16}) = ccall(:GetEnvironmentVariableW,stdcall,UInt32,(Ptr{UInt16},Ptr{UInt16},UInt32),var,C_NULL,0)
@@ -84,7 +84,7 @@ delete!(::EnvHash, k::AbstractString) = (_unsetenv(k); ENV)
 setindex!(::EnvHash, v, k::AbstractString) = _setenv(k,string(v))
 push!(::EnvHash, k::AbstractString, v) = setindex!(ENV, v, k)
 
-if is_windows()
+if Sys.iswindows()
     start(hash::EnvHash) = (pos = ccall(:GetEnvironmentStringsW,stdcall,Ptr{UInt16},()); (pos,pos))
     function done(hash::EnvHash, block::Tuple{Ptr{UInt16},Ptr{UInt16}})
         if unsafe_load(block[1]) == 0

base/event.jl

@@ -247,7 +247,7 @@ function wait()
     # unreachable
 end
 
-if is_windows()
+if Sys.iswindows()
     pause() = ccall(:Sleep, stdcall, Void, (UInt32,), 0xffffffff)
 else
     pause() = ccall(:pause, Void, ())

base/exports.jl

@@ -1258,14 +1258,6 @@ export
     @code_llvm,
     @code_native,
 
-    # platform-conditional code
-    @static,
-    is_windows,
-    is_linux,
-    is_apple,
-    is_bsd,
-    is_unix,
-
     # tasks
     @schedule,
     @sync,
@@ -1295,6 +1287,7 @@ export
     @goto,
     @view,
     @views,
+    @static,
 
 # SparseArrays module re-exports
     SparseArrays,

base/file.jl

@@ -51,7 +51,7 @@ function cd(dir::AbstractString)
 end
 cd() = cd(homedir())
 
-if is_windows()
+if Sys.iswindows()
     function cd(f::Function, dir::AbstractString)
         old = pwd()
         try
@@ -91,7 +91,7 @@ this function throws an error. See [`mkpath`](@ref) for a function which creates
 required intermediate directories.
 """
 function mkdir(path::AbstractString, mode::Unsigned=0o777)
-    @static if is_windows()
+    @static if Sys.iswindows()
         ret = ccall(:_wmkdir, Int32, (Cwstring,), path)
     else
         ret = ccall(:mkdir, Int32, (Cstring, UInt32), path, mode)
@@ -136,7 +136,7 @@ directory, then all contents are removed recursively.
 function rm(path::AbstractString; force::Bool=false, recursive::Bool=false)
     if islink(path) || !isdir(path)
         try
-            @static if is_windows()
+            @static if Sys.iswindows()
                 # is writable on windows actually means "is deletable"
                 if (filemode(path) & 0o222) == 0
                     chmod(path, 0o777)
@@ -155,7 +155,7 @@ function rm(path::AbstractString; force::Bool=false, recursive::Bool=false)
                 rm(joinpath(path, p), force=force, recursive=true)
             end
         end
-        @static if is_windows()
+        @static if Sys.iswindows()
             ret = ccall(:_wrmdir, Int32, (Cwstring,), path)
         else
             ret = ccall(:rmdir, Int32, (Cstring,), path)
@@ -254,7 +254,7 @@ function touch(path::AbstractString)
     end
 end
 
-if is_windows()
+if Sys.iswindows()
 
 function tempdir()
     temppath = Vector{UInt16}(32767)
@@ -536,7 +536,7 @@ function sendfile(src::AbstractString, dst::AbstractString)
     end
 end
 
-if is_windows()
+if Sys.iswindows()
     const UV_FS_SYMLINK_JUNCTION = 0x0002
 end
 
@@ -550,20 +550,20 @@ Creates a symbolic link to `target` with the name `link`.
     soft symbolic links, such as Windows XP.
 """
 function symlink(p::AbstractString, np::AbstractString)
-    @static if is_windows()
+    @static if Sys.iswindows()
         if Sys.windows_version() < Sys.WINDOWS_VISTA_VER
             error("Windows XP does not support soft symlinks")
         end
     end
     flags = 0
-    @static if is_windows()
+    @static if Sys.iswindows()
         if isdir(p)
             flags |= UV_FS_SYMLINK_JUNCTION
             p = abspath(p)
         end
     end
     err = ccall(:jl_fs_symlink, Int32, (Cstring, Cstring, Cint), p, np, flags)
-    @static if is_windows()
+    @static if Sys.iswindows()
         if err < 0 && !isdir(p)
             Base.warn_once("Note: on Windows, creating file symlinks requires Administrator privileges.")
         end

base/filesystem.jl

@@ -44,7 +44,7 @@ import Base:
     skip, stat, unsafe_read, unsafe_write, transcode, uv_error, uvhandle,
     uvtype, write
 
-if is_windows()
+if Sys.iswindows()
     import Base: cwstring
 end
 

base/initdefs.jl

@@ -50,7 +50,7 @@ const LOAD_CACHE_PATH = String[]
 function init_load_path()
     vers = "v$(VERSION.major).$(VERSION.minor)"
     if haskey(ENV, "JULIA_LOAD_PATH")
-        prepend!(LOAD_PATH, split(ENV["JULIA_LOAD_PATH"], @static is_windows() ? ';' : ':'))
+        prepend!(LOAD_PATH, split(ENV["JULIA_LOAD_PATH"], @static Sys.iswindows() ? ';' : ':'))
     end
     push!(LOAD_PATH, abspath(JULIA_HOME, "..", "local", "share", "julia", "site", vers))
     push!(LOAD_PATH, abspath(JULIA_HOME, "..", "share", "julia", "site", vers))

base/interactiveutil.jl

@@ -10,7 +10,7 @@ for use within backticks. You can change the editor by setting `JULIA_EDITOR`, `
 `EDITOR` as an environment variable.
 """
 function editor()
-    if is_windows() || is_apple()
+    if Sys.iswindows() || Sys.isapple()
         default_editor = "open"
     elseif isfile("/etc/alternatives/editor")
         default_editor = "/etc/alternatives/editor"
@@ -49,11 +49,11 @@ function edit(path::AbstractString, line::Integer=0)
         cmd = line != 0 ? `$command $path -l $line` : `$command $path`
     elseif startswith(name, "subl") || startswith(name, "atom")
         cmd = line != 0 ? `$command $path:$line` : `$command $path`
-    elseif name == "code" || (is_windows() && uppercase(name) == "CODE.EXE")
+    elseif name == "code" || (Sys.iswindows() && uppercase(name) == "CODE.EXE")
         cmd = line != 0 ? `$command -g $path:$line` : `$command -g $path`
     elseif startswith(name, "notepad++")
         cmd = line != 0 ? `$command $path -n$line` : `$command $path`
-    elseif is_apple() && name == "open"
+    elseif Sys.isapple() && name == "open"
         cmd = `open -t $path`
         line_unsupported = true
     else
@@ -62,8 +62,8 @@ function edit(path::AbstractString, line::Integer=0)
         line_unsupported = true
     end
 
-    if is_windows() && name == "open"
-        @static is_windows() && # don't emit this ccall on other platforms
+    if Sys.iswindows() && name == "open"
+        @static Sys.iswindows() && # don't emit this ccall on other platforms
             systemerror(:edit, ccall((:ShellExecuteW, "shell32"), stdcall, Int,
                                      (Ptr{Void}, Cwstring, Cwstring, Ptr{Void}, Ptr{Void}, Cint),
                                      C_NULL, "open", path, C_NULL, C_NULL, 10) ≤ 32)
@@ -90,7 +90,7 @@ edit(file, line::Integer) = error("could not find source file for function")
 
 # terminal pager
 
-if is_windows()
+if Sys.iswindows()
     function less(file::AbstractString, line::Integer)
         pager = get(ENV, "PAGER", "more")
         g = pager == "more" ? "" : "g"
@@ -123,15 +123,15 @@ less(file, line::Integer) = error("could not find source file for function")
 
 # clipboard copy and paste
 
-if is_apple()
+if Sys.isapple()
     function clipboard(x)
         open(pipeline(`pbcopy`, stderr=STDERR), "w") do io
             print(io, x)
         end
     end
     clipboard() = readstring(`pbpaste`)
 
-elseif is_linux()
+elseif Sys.islinux()
     _clipboardcmd = nothing
     function clipboardcmd()
         global _clipboardcmd
@@ -158,7 +158,7 @@ elseif is_linux()
         readstring(pipeline(cmd, stderr=STDERR))
     end
 
-elseif is_windows()
+elseif Sys.iswindows()
     # TODO: these functions leak memory and memory locks if they throw an error
     function clipboard(x::AbstractString)
         if containsnul(x)
@@ -262,21 +262,21 @@ function versioninfo(io::IO=STDOUT; verbose::Bool=false, packages::Bool=false)
         println(io, "DEBUG build")
     end
     println(io, "Platform Info:")
-    println(io, "  OS: ", is_windows() ? "Windows" : is_apple() ?
+    println(io, "  OS: ", Sys.iswindows() ? "Windows" : Sys.isapple() ?
         "macOS" : Sys.KERNEL, " (", Sys.MACHINE, ")")
 
     if verbose
         lsb = ""
-        if is_linux()
+        if Sys.islinux()
             try lsb = readchomp(pipeline(`lsb_release -ds`, stderr=DevNull)) end
         end
-        if is_windows()
+        if Sys.iswindows()
             try lsb = strip(readstring(`$(ENV["COMSPEC"]) /c ver`)) end
         end
         if !isempty(lsb)
             println(io, "      ", lsb)
         end
-        if is_unix()
+        if Sys.isunix()
             println(io, "  uname: ", readchomp(`uname -mprsv`))
         end
     end
@@ -592,7 +592,7 @@ end
 # file downloading
 
 downloadcmd = nothing
-if is_windows()
+if Sys.iswindows()
     function download(url::AbstractString, filename::AbstractString)
         res = ccall((:URLDownloadToFileW,:urlmon),stdcall,Cuint,
                     (Ptr{Void},Cwstring,Cwstring,Cuint,Ptr{Void}),C_NULL,url,filename,0,C_NULL)