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Using a macro to generate a Julia command to be executed in the REPL


Using a macro to generate a Julia command to be executed in the REPL

By : Jorge Alvarez
Date : November 20 2020, 07:00 PM
With these it helps As far as I understand (and I'm not sure what the printing does in your example), you want a macro that expands
code :
@create <id> <name>
<id> = newEV("<id>", name)
julia> macro create(id::Symbol, name)
           :($(esc(id)) = newEV($(String(id)), $name))
       end
@create (macro with 1 method)

julia> @macroexpand @create EV_234324 "new test"
:(EV_234324 = (Main.newEV)("EV_234324", "new test"))


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Julia - UndefVarError in macro when used in function but not in REPL

Julia - UndefVarError in macro when used in function but not in REPL


By : rwinsia
Date : March 29 2020, 07:55 AM
will help you Your macro computes a value, not an expression. Thus, since macros run at compile time and not at runtime, it will essentially look to esc(x) at compile time but, since x is 1 at compile time, your function will compile to f(x)=1. What you want to instead do is have your macro return the expression x so that way your function compiles to f(x)=x. That is:
code :
macro mtest()
    quote 
       x
    end
end
how to change CWD for a command executed in Julia?

how to change CWD for a command executed in Julia?


By : moj
Date : March 29 2020, 07:55 AM
wish of those help Julia doesn't use shell like other languages for running external programs. How can I do the equivalent of cd temp_dir && some_cmd in Julia? As far as I understand cd() changes the working directory globally which is a problem if I execute blocks of code in parallel. , Looking at the docstring for the cd function:
code :
help?> cd
search: cd Cdouble gcd gcdx secd vecdot asecd cld Cmd codeunit CodeInfo

  cd(dir::AbstractString=homedir())

  Set the current working directory.

  cd(f::Function, dir::AbstractString=homedir())

  Temporarily changes the current working directory and applies function f
  before returning.
julia> cd(readdir, "temp_dir/")
2-element Array{String,1}:
 "code.jl" 
 "file.txt"

julia> cd("temp_dir/") do
           mkdir("subdir")
       end

julia> cd(readdir, "temp_dir/")
3-element Array{String,1}:
 "code.jl" 
 "file.txt"
 "subdir"  
Asynchronously executed command captures REPL input

Asynchronously executed command captures REPL input


By : Balaji
Date : March 29 2020, 07:55 AM
help you fix your problem Your understanding of how open works is correct. As you've clarified in the comments, your question is about why sudo is asking for the password in the terminal instead of reading from stream. This is explained well by Bob at https://serverfault.com/a/731943. Quoting the relevant parts of the answer:
get path of the executed file through external function or macro in Julia

get path of the executed file through external function or macro in Julia


By : user3089013
Date : March 29 2020, 07:55 AM
Does that help Quoting __source__ is what is recommended in the Julia manual. Here is an example
File f1.jl
code :
module Trace

export @trace

macro trace()
    return QuoteNode(__source__)
end

end # module
include("f1.jl")

using .Trace

println("I want: ", (@__FILE__, @__LINE__)); println("I get: ", @trace)

x = @trace
dump(x)

println("This is not what you want: ", PROGRAM_FILE)
include("f2.jl")
$ julia f3.jl
I want: ("D:\\f2.jl", 5)
I get: #= D:\f2.jl:5 =#
LineNumberNode
  line: Int64 7
  file: Symbol D:\f2.jl
This is not what you want: f3.jl
Julia: find out if run from REPL or command line

Julia: find out if run from REPL or command line


By : user3474747
Date : March 29 2020, 07:55 AM
Any of those help Simply use isinteractive to determine whether Julia is running an interactive session.
Consider the example below (I use $ for command line prompt and julia> for Julia REPL prompt)
code :
$ more test.jl

println("interactive : $(isinteractive())")


$ julia test.jl
interactive : false
julia> include("test.jl")
interactive : true
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