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implement pre-run REPL hooks. #16384

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implement pre-run REPL hooks. #16384

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3 changes: 3 additions & 0 deletions base/REPL.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -878,6 +878,9 @@ function run_frontend(repl::LineEditREPL, backend)
interface = repl.interface
end
repl.backendref = backend
if length(Base.pre_run_repl_hooks) > 0
Base._atreplrun(repl)
end
run_interface(repl.t, interface)
dopushdisplay && popdisplay(d)
end
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16 changes: 16 additions & 0 deletions base/client.jl
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Expand Up @@ -311,6 +311,22 @@ function _atreplinit(repl)
end
end

const pre_run_repl_hooks = []

atreplrun(f::Function) = (unshift!(pre_run_repl_hooks, f); nothing)

function _atreplrun(repl)
for f in pre_run_repl_hooks
try
f(repl)
catch err
show(STDERR, err)
println(STDERR)
end
end
end


function _start()
empty!(ARGS)
append!(ARGS, Core.ARGS)
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