howl.ui.markup.terminal

(ANSI escape sequences)

handles bold

expected = StyledText 'foo', { 1, 'ansi_bold', 4 }
assert.same expected, m '\027[1mfoo\027[0m'

handles italic

expected = StyledText 'foo', { 1, 'ansi_italic', 4 }
assert.same expected, m '\027[3mfoo\027[0m'

handles underline

expected = StyledText 'foo', { 1, 'ansi_underline', 4 }
assert.same expected, m '\027[4mfoo\027[0m'

handles background colors

expected = StyledText 'foo', { 1, 'ansi_red', 4 }
assert.same expected, m '\027[31mfoo\027[0m'

handles background colors

expected = StyledText 'foo', { 1, 'ansi_on_red', 4 }
assert.same expected, m '\027[41mfoo\027[0m'

handles combined foreground and background colors

expected = StyledText 'foo', { 1, 'ansi_green_on_red', 4 }
assert.same expected, m '\027[41;32mfoo\027[0m'

styles remain in effect until resetted

expected = StyledText 'foobar', {
  1, 'ansi_on_red', 4
  4, 'ansi_green_on_red', 7
}
assert.same expected, m '\027[41mfoo\027[32mbar\027[0m'

handles empty reset sequences

expected = StyledText 'foobar', { 1, 'ansi_italic', 4 }
assert.same expected, m '\027[3mfoo\027[mbar'

handles prematurely terminated sequences

expected = StyledText 'foo', { 1, 'ansi_red', 4 }
assert.same expected, m '\027[31mfoo'

handles foreground color resetting

expected = StyledText 'foobar', { 1, 'ansi_red', 4 }
assert.same expected, m '\027[31mfoo\027[39mbar'

handles background color resetting

expected = StyledText 'foobar', { 1, 'ansi_on_red', 4 }
assert.same expected, m '\027[41mfoo\027[49mbar'

skips over unhandled escape sequences

expected = StyledText 'foo', {}
assert.same expected, m '\027[2,2Hfoo'

ignores unhandled graphic parameters

expected = StyledText 'foo', { 1, 'ansi_red', 4 }
assert.same expected, m '\027[31;5;6mfoo\027[m'

(backspace characters (BS))

deletes back properly

expected = StyledText 'fo', {}
assert.same expected, m 'foo\008'

deletes a UTF-8 code point back, and not a byte

expected = StyledText 'åä', {}
assert.same expected, m 'åäö\008'

BS at the start of the text is left alone

expected = StyledText '\008foo', {}
assert.same expected, m '\008foo'

updates the styling accordingly

expected = StyledText 'fobar', { 1, 'ansi_red', 3 }
assert.same expected, m '\027[31mfoo\027[m\008bar'

removes any left empty styling

expected = StyledText 'fobar', { }
assert.same expected, m 'fo\027[31mo\027[m\008bar'