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require "delegate"
RSpec.describe TTY::Screen do
class Output < SimpleDelegator
def winsize
[100, 200]
end
def big_endian?
[1].pack("S") == [1].pack("n")
end
def ioctl(control, buf)
little_endian = "3\x00\xD3\x00\xF2\x04\xCA\x02\x00"
big_endian = "\x003\x00\xD3\x04\xF2\x02\xCA"
buf.replace(big_endian? ? big_endian : little_endian)
0
end
end
let(:output) { Output.new(StringIO.new("", "w+")) }
subject(:screen) { described_class }
describe "#size" do
it "correctly falls through choices" do
old_output = screen.output
screen.output = StringIO.new
{
size_from_java: nil,
size_from_win_api: nil,
size_from_ioctl: nil,
size_from_io_console: [51, 280],
size_from_readline: nil
}.each do |size_method, result|
allow(screen).to receive(size_method) { result }
end
expect(screen.size).to eq([51, 280])
expect(screen).to have_received(:size_from_java)
expect(screen).to have_received(:size_from_win_api)
expect(screen).to have_received(:size_from_ioctl)
expect(screen).to_not have_received(:size_from_readline)
screen.output = old_output
end
end
describe "#size_from_win_api" do
it "doesn't check size on non-windows platform", unless: TTY::Screen.windows? do
expect(screen.size_from_win_api).to eq(nil)
end
end
describe "#size_from_java" do
it "doesn't import java on non-jruby platform", unless: TTY::Screen.jruby? do
expect(screen.size_from_java).to eq(nil)
end
it "imports java library on jruby", if: TTY::Screen.jruby? do
class << screen
def java_import(*args); end
end
terminal = double(:terminal, get_height: 51, get_width: 211)
factory = double(:factory, get: terminal)
stub_const("TTY::Screen::TerminalFactory", factory)
allow(screen).to receive(:jruby?).and_return(true)
allow(screen).to receive(:require).with("java").and_return(true)
allow(screen).to receive(:java_import)
expect(screen.size_from_java).to eq([51, 211])
end
end
describe "#size_from_io_console" do
it "calcualtes the size" do
old_output = screen.output
screen.output = StringIO.new
allow(IO).to receive(:method_defined?).with(:winsize) { true }
allow(screen.output).to receive(:tty?) { true }
allow(screen.output).to receive(:respond_to?) { true }
allow(screen.output).to receive(:winsize) { [100, 200] }
expect(screen.size_from_io_console).to eq([100, 200])
expect(screen.output).to have_received(:winsize)
screen.output = old_output
end
it "doesn't calculate size if io/console not available" do
allow(IO).to receive(:method_defined?).with(:winsize).and_return(false)
allow(screen).to receive(:require).with("io/console").and_raise(LoadError)
expect(screen.size_from_io_console).to eq(nil)
end
it "doesn't calculate size if it is run without a console" do
allow(IO).to receive(:method_defined?).with(:winsize) { true }
allow(screen).to receive(:require).with("io/console") { true }
allow(screen.output).to receive(:tty?) { true }
allow(screen.output).to receive(:respond_to?).with(:winsize) { false }
expect(screen.size_from_io_console).to eq(nil)
end
end
describe "#size_from_ioctl" do
def replace_streams(*streams)
originals = [$stdout, $stdin, $stderr]
$stdout, $stdin, $stderr = output, output, output
yield
ensure
$stdout, $stdin, $stderr = *originals
end
it "reads terminal size", unless: TTY::Screen.windows? || TTY::Screen.jruby? do
replace_streams do
expect(screen.size_from_ioctl).to eq([51, 211])
end
end
it "skips reading on jruby", if: TTY::Screen.jruby? do
expect(screen.size_from_ioctl).to eq(nil)
end
end
describe "#size_from_tput" do
it "doesn't run command if outside of terminal" do
allow(screen.output).to receive(:tty?).and_return(false)
expect(screen.size_from_tput).to eq(nil)
end
it "doesn't run command if not available" do
allow(screen).to receive(:command_exist?).and_return(false)
expect(screen.size_from_tput).to eq(nil)
end
it "runs tput commands" do
allow(screen.output).to receive(:tty?).and_return(true)
allow(screen).to receive(:command_exist?).with("tput").and_return(true)
allow(screen).to receive(:run_command).with("tput", "lines").and_return(51)
allow(screen).to receive(:run_command).with("tput", "cols").and_return(280)
expect(screen.size_from_tput).to eq([51, 280])
end
it "doesn't return zero size" do
allow(screen.output).to receive(:tty?).and_return(true)
allow(screen).to receive(:command_exist?).with("tput").and_return(true)
allow(screen).to receive(:run_command).with("tput", "lines").and_return(0)
allow(screen).to receive(:run_command).with("tput", "cols").and_return(0)
expect(screen.size_from_tput).to eq(nil)
end
end
describe "#size_from_stty" do
it "doesn't run command if outside of terminal" do
allow(screen.output).to receive(:tty?).and_return(false)
expect(screen.size_from_stty).to eq(nil)
end
it "doesn't run command if not available" do
allow(screen).to receive(:command_exist?).and_return(false)
expect(screen.size_from_stty).to eq(nil)
end
it "runs stty commands" do
allow(screen.output).to receive(:tty?).and_return(true)
allow(screen).to receive(:command_exist?).with("stty").and_return(true)
allow(screen).to receive(:run_command).with("stty", "size").and_return("51 280")
expect(screen.size_from_stty).to eq([51, 280])
end
it "doesn't return zero size" do
allow(screen.output).to receive(:tty?).and_return(true)
allow(screen).to receive(:command_exist?).with("stty").and_return(true)
allow(screen).to receive(:run_command).with("stty", "size").and_return("0 0")
expect(screen.size_from_stty).to eq(nil)
end
end
describe "#size_from_env" do
it "doesn't calculate size without COLUMNS key" do
old_env = screen.env
screen.env = {"COLUMNS" => nil}
expect(screen.size_from_env).to eq(nil)
screen.env = old_env
end
it "extracts lines and columns from environment" do
old_env = screen.env
screen.env = {"COLUMNS" => "280", "LINES" => "51"}
expect(screen.size_from_env).to eq([51, 280])
screen.env = old_env
end
it "doesn't return zero size" do
old_env = screen.env
screen.env = {"COLUMNS" => "0", "LINES" => "0"}
expect(screen.size_from_env).to eq(nil)
screen.env = old_env
end
end
describe "#size_from_ansicon" do
it "doesn't calculate size without ANSICON key" do
old_env = screen.env
screen.env = {"ANSICON" => nil}
expect(screen.size_from_ansicon).to eq(nil)
screen.env = old_env
end
it "extracts lines and columns from environment" do
old_env = screen.env
screen.env = {"ANSICON" => "(280x51)"}
expect(screen.size_from_ansicon).to eq([51, 280])
screen.env = old_env
end
it "doesn't return zero size" do
old_env = screen.env
screen.env = {"ANSICON" => "(0x0)"}
expect(screen.size_from_ansicon).to eq(nil)
screen.env = old_env
end
end
describe "#size_from_default" do
it "suggests default terminal size" do
[:size_from_java,
:size_from_win_api,
:size_from_ioctl,
:size_from_io_console,
:size_from_readline,
:size_from_tput,
:size_from_stty,
:size_from_env,
:size_from_ansicon].each do |method|
allow(screen).to receive(method).and_return(nil)
end
expect(screen.size).to eq([27, 80])
end
end
describe "#width" do
it "calcualtes screen width" do
allow(screen).to receive(:size).and_return([51, 280])
expect(screen.width).to eq(280)
end
it "aliases width to columns and cols" do
allow(screen).to receive(:size).and_return([51, 280])
expect(screen.columns).to eq(280)
expect(screen.cols).to eq(280)
end
end
describe "#height" do
it "calcualtes screen height" do
allow(screen).to receive(:size).and_return([51, 280])
expect(screen.height).to eq(51)
end
it "aliases width to rows and lines" do
allow(screen).to receive(:size).and_return([51, 280])
expect(screen.rows).to eq(51)
expect(screen.lines).to eq(51)
end
end
end
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