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# frozen_string_literal: true
module IRB
module Command
class CD < Base
category "Workspace"
description "Move into the given object or leave the current context."
help_message(<<~HELP)
Usage: cd ([target]|..)
IRB uses a stack of workspaces to keep track of context(s), with `pushws` and `popws` commands to manipulate the stack.
The `cd` command is an attempt to simplify the operation and will be subject to change.
When given:
- an object, cd will use that object as the new context by pushing it onto the workspace stack.
- "..", cd will leave the current context by popping the top workspace off the stack.
- no arguments, cd will move to the top workspace on the stack by popping off all workspaces.
Examples:
cd Foo
cd Foo.new
cd @ivar
cd ..
cd
HELP
def execute(arg)
case arg
when ".."
irb_context.pop_workspace
when ""
# TODO: decide what workspace commands should be kept, and underlying APIs should look like,
# and perhaps add a new API to clear the workspace stack.
prev_workspace = irb_context.pop_workspace
while prev_workspace
prev_workspace = irb_context.pop_workspace
end
else
begin
obj = eval(arg, irb_context.workspace.binding)
irb_context.push_workspace(obj)
rescue StandardError => e
warn "Error: #{e}"
end
end
end
end
end
end
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