Emacs doesn't understand Julian in Windows

[ShuguangSun]

Emacs 24.3.50 + Win 7 (32 bit)
Julia 0.2.0-rc4

When I start shell (M-x shell) and run julia.bat or julia-baisic, I cann't see the prompt "julia>". But I can run julia script/command after that. When I want exit jula, I need to type exit() return and return again.

I run test-julia.bat in emacs cmd shell and got "�[32;1mSUCCESS�[0m".

In ESS, when I run julia by M-x Julia, emacs/ESS got frozen. I can use C-g to escape, and I have the Julia buffer, and threre is a running julia process for that buffer, and I can run julia script/command in this buffer. When I want to exit julia, I can type C-c C-q, which will pass "exit()" to julia, but I need to hit an additional return in the Julia buffer (the same issue with cmd shell).

I tried these code:

function run()
    ssize = 10000
end
for i in 1:4
    print("$(@elapsed run())  ")
end
function run()
    ssize = 10000
end
for i in 1:4
    print("$(@elapsed run())  ")
end

I can get:

run (generic function with 1 method)
7.9e-7  7.9e-7  7.9e-7  3.95e-7  run (generic function with 1 method)
0.0  0.0  3.95e-7  0.0

There seems a "return" is missing after the output in emacs cmd shell.

[vtjnash]

related to #4589

[ShuguangSun]

The emacs is not under cygwin, but windows/gtk, you can find at
http://ftp.gnu.org/gnu/emacs/windows/
or
http://sourceforge.net/projects/emacs-bin/files/snapshots/

[xificurC]

I get the same behavior under windows.

[vtjnash]

since #4589 is now closed, can you post the string returned from calling uv_pipe_getsockname
https://github.com/joyent/libuv/blob/49cb40c47902dd04c7787e6543e9e13368dc1840/include/uv.h#L1266

[vtjnash]

closing due to non-response. perhaps this is now fixed?

[fradav]

No it is not fixed at all. The problem is that julia’s REPL (even the BasicREPL) expects a Base.TTY on its stdin/stdout/stderr, and emacs can’t give it on windows (non-cygwin).
But there is an easy workaround, just load (-L) julia with this :

using Base.Terminals: UnixTerminal
using Base.REPL: BasicREPL, run_repl

type PipeTerminal <: UnixTerminal
    in_stream::Base.Pipe
    out_stream::Base.Pipe
    err_stream::Base.Pipe
end

run_repl(BasicREPL(PipeTerminal(STDIN,STDOUT,STDERR)))

And then ESS/julia works.

[pao]

That seems helpful--I'm not completely familiar with the pieces to this puzzle, but is there a place we can fit it in where this would Just Work? If so it would be great to have a pull request which puts this all together.

[fradav]

Fixing it from the emacs side is easy : put the above code in <yourfile.jl> and

(setq inferior-julia-args "-L <yourfile.jl>")

in your .emacs.

Fixing it from the julia side is a different story (it involves modifying the base repl.jl file in order to detect if we are in a situation which requires Base.Pipe instead of Base.TTY for terminal handling AND to test if it doesn't break anything else...).
The real question is : is there a real need for this ?

[pao]

Is the Emacs code something that would fit into julia-mode.el? Can we drop this little scrap in contrib/? Do we have an appropriate README?

I'm just looking for ways to break this out of a string of GitHub issue comments is all.

[vtjnash]

is there any way to detect this from the julia side? for example, for cygwin pipes, we do a string comparison against the name of the pipe to determine if it came from a cygwin process.

[ShuguangSun]

It seems the code doesn't work for Julia 0.4 dev. Emacs hang and when I run it in Julia terminal, I got error message:

ERROR: LoadError: MethodError: `convert` has no method matching convert(::Type{Base.Pipe}, ::IOStream)
This may have arisen from a call to the constructor Base.Pipe(...),
since type constructors fall back to convert methods.
Closest candidates are:
  Base.Pipe(::Any)
  call{T}(::Type{T}, ::Any)
  convert{T}(::Type{T}, !Matched::T)
  ...
 in call at c:\Users\user\HOME\_julia:5
 in include at boot.jl:259
 in include_from_node1 at loading.jl:267
 in process_options at client.jl:308
 in _start at client.jl:411
while loading c:\Users\user\HOME\_julia, in expression starting on line 10

[vtjnash]

rather than Base.Pipe in the above example, I would use simply IO.

[ShuguangSun]

'IO' works for Julia 0.4 dev + Emacs 20.0.50.1.
It needs the full path to the load file "<yourfile.jl>" if it is not under current directory.