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Versions: 107
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Contents
require 'open3'
module RVM
module Shell
# Implementation of the abstract wrapper class that opens a new
# instance of bash when a command is run, only keeping it around
# for the lifetime of the command. Possibly inefficient but for
# the moment simplest and hence default implementation.
class SingleShotWrapper < AbstractWrapper
attr_accessor :current
# Runs a given command in the current shell.
# Defaults the command to true if empty.
def run_command(command)
command = "true" if command.to_s.strip.empty?
with_shell_instance do
stdin.puts wrapped_command(command)
stdin.close
out, err = stdout.read, stderr.read
out, status, _ = raw_stdout_to_parts(out)
return status, out, err
end
end
# Runs a command, ensuring no output is collected.
def run_command_silently(command)
with_shell_instance do
stdin.puts silent_command(command)
end
end
protected
# yields stdio, stderr and stdin for a shell instance.
# If there isn't a current shell instance, it will create a new one.
# In said scenario, it will also cleanup once it is done.
def with_shell_instance(&blk)
no_current = @current.nil?
if no_current
@current = Open3.popen3(self.shell_executable)
invoke_setup!
end
yield
ensure
@current = nil if no_current
end
# Direct access to each of the named descriptors
def stdin; @current[0]; end
def stdout; @current[1]; end
def stderr; @current[2]; end
end
end
end
Version data entries
107 entries across 107 versions & 2 rubygems