Add octal prefix (0o) to filemode in StatStruct (JuliaLang#20919)

* Add octal prefix (0o) to filemode in StatStruct

Makes it clear it is in octal

* add parsing test

Author: simonbyrne

base/stat.jl

@@ -57,7 +57,7 @@ StatStruct(buf::Union{Vector{UInt8},Ptr{UInt8}}) = StatStruct(
     ccall(:jl_stat_ctime,   Float64, (Ptr{UInt8},), buf),
 )
 
-show(io::IO, st::StatStruct) = print(io, "StatStruct(mode=$(oct(filemode(st),6)), size=$(filesize(st)))")
+show(io::IO, st::StatStruct) = print(io, "StatStruct(mode=0o$(oct(filemode(st),6)), size=$(filesize(st)))")
 
 # stat & lstat functions
 

test/file.jl

@@ -430,6 +430,8 @@ c_stat = stat(cfile)
 @test a_stat.size == b_stat.size
 @test a_stat.size == c_stat.size
 
+@test parse(Int,match(r"mode=(.*),",sprint(show,a_stat)).captures[1]) == a_stat.mode
+
 close(af)
 rm(afile)
 rm(bfile)