test failure in lineedit.jl

[stevengj]

Just got

    JULIA test/lineedit
     * lineedit
exception on 1: ERROR: test failed: position(buf) == 0
 in error at error.jl:21
 in default_handler at test.jl:19
 in do_test at test.jl:39
 in anonymous at no file:145
 in runtests at /Users/stevenj/Code/julia/test/testdefs.jl:5
 in anonymous at multi.jl:652
 in run_work_thunk at multi.jl:613
 in remotecall_fetch at multi.jl:686
 in remotecall_fetch at multi.jl:701
 in anonymous at task.jl:1348
while loading lineedit.jl, in expression starting on line 142
ERROR: test failed: position(buf) == 0
 in error at error.jl:21
 in default_handler at test.jl:19
 in do_test at test.jl:39
 in anonymous at no file:145
 in runtests at /Users/stevenj/Code/julia/test/testdefs.jl:5
 in anonymous at multi.jl:652
 in run_work_thunk at multi.jl:613
 in remotecall_fetch at multi.jl:686
 in remotecall_fetch at multi.jl:701
 in anonymous at task.jl:1348
while loading lineedit.jl, in expression starting on line 142
while loading /Users/stevenj/Code/julia/test/runtests.jl, in expression starting on line 46

in MacOS 10.8.5.

[stevengj]

Weird.

Entering:

using Base.LineEdit
buf = IOBuffer()
LineEdit.edit_insert(buf, "â")
LineEdit.edit_move_left(buf)
println(position(buf))

at the REPL prints 0, but putting the same lines into a file and running them via include prints 1.

Ah... it looks like pasting "â" somehow results in an NFKC-normalized string in the Terminal. The following code always prints 1:

using Base.LineEdit
buf = IOBuffer()
s = "â"
LineEdit.edit_insert(buf, normalize_string(s, :NFKD))
LineEdit.edit_move_left(buf)
println(position(buf))

[stevengj]

cc: @loladiro ... probably related to #6939

[jiahao]

you mean @Keno

[stevengj]

I think he should just pick some unpronounceable Unicode glyph.

[stevengj]

Yes, it looks like this is the charwidth bug on MacOS 10.8 from #6939 :

[charwidth(c) for c in normalize_string("â", :NFKD)]
2-element Array{Int64,1}:
 1
 1