My startup.jl has become a place for tools that are too simple to be behind an import, and probably too opinionated for Base
"""
@subprocess ex
@subprocess ex wait=false
Execute `ex` in a subprocess that mimics the current process configuration.
Returns the constructed `Process`.
See [`Base.julia_cmd`](@ref) for the subprocess configuration forwarding that is used.
```julia-repl
julia> println("hello from $(Base.getpid())")
hello from 35640
julia> @subprocess println("hello from $(Base.getpid())")
hello from 43056
Process(`/home/user/julia/julia -Cnative -J/home/user/julia/usr/lib/julia/sys.dylib -g1 -e 'println("hello from $(Base.getpid())")'`, ProcessExited(0))
```
"""
macro subprocess(ex, wait=true)
quote
local ex_str = $(esc(sprint(Base.show_unquoted,ex)))
run(`$(Base.julia_cmd()) -e "$(ex_str)"`, wait = $(wait))
end
end
# See: https://github.com/IanButterworth/julia/tree/ib/subprocess_macro
"""
@repeat call
@repeat n call
@repeat expr call
Repeat `call` until interrupt, or `n` times, and discard the output.
If an expression is given that returns an Integer, repeat that many times.
If an expression is given that returns a Bool, repeat until false.
```julia
julia> @repeat println("hello")
hello
hello
^ChelloERROR: InterruptException:
...
julia> @repeat 3 println("hello")
hello
hello
hello
julia> @repeat 2 + 1 println("hello")
hello
hello
hello
julia> @repeat rand() > 0.5 println("hello")
hello
hello
```
"""
macro repeat(exs...)
if length(exs) == 1
quote
while true
$(esc(first(exs)))
end
end
elseif length(exs) == 2
terms = first(exs)
ex = last(exs)
if terms <: Integer
quote
for _ = 1:$(esc(terms))
$(esc(ex))
end
end
elseif terms isa Expr
quote
local terms_eval = $(esc(terms))
if terms_eval isa Bool
if terms_eval
$(esc(ex)) # do once given that terms has been evaled once already
while $(esc(terms))
$(esc(ex))
end
end
elseif terms_eval isa Integer
for _ in 1:terms_eval
$(esc(ex))
end
else
throw(ArgumentError("@repeat first argument must return an Integer or a Bool"))
end
end
else
throw(ArgumentError("@repeat first argument must be an Integer literal, or an expression that returns an Integer or Bool"))
end
else
throw(ArgumentError("Too many arguments passed to @repeat"))
end
end
# See: https://github.com/JuliaLang/julia/pull/41455