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# Colorful language
HELP := "
colorful: A domain-specific language for writing colored text to the terminal
Usage: colorful [args...] [--by-line] [--files files...]
"
CSI := "$\033["
use patterns
lang Colorful
convert(text:Text -> Colorful)
text = text.translate({"@"="@(at)", "("="@(lparen)", ")"="@(rparen)"})
return Colorful.from_text(text)
convert(i:Int -> Colorful) return Colorful.from_text("$i")
convert(n:Num -> Colorful) return Colorful.from_text("$n")
func for_terminal(c:Colorful -> Text)
return CSI ++ "m" ++ _for_terminal(c, _TermState())
func print(c:Colorful, newline=yes)
say(c.for_terminal(), newline=newline)
func main(texts:[Text], files:[Path]=[], by_line=no)
for i,text in texts
colorful := Colorful.from_text(text)
colorful.print(newline=no)
if i == texts.length then say("")
else say(" ", newline=no)
if texts.length == 0 and files.length == 0
files = [(/dev/stdin)]
for file in files
if by_line
for line in file.by_line() or exit("Could not read file: $file")
colorful := Colorful.from_text(line)
colorful.print()
else
colorful := Colorful.from_text(file.read() or exit("Could not read file: $file"))
colorful.print(newline=no)
func _for_terminal(c:Colorful, state:_TermState -> Text)
return c.text.map_pattern(recursive=no, $Pat/@(?)/, func(m:PatternMatch) _add_ansi_sequences(m.captures[1], state))
enum _Color(Default, Bright(color:Int16), Color8Bit(color:Int16), Color24Bit(color:Int32))
func from_text(text:Text -> _Color?)
if text.matches_pattern($Pat/#{3-6 hex}/)
hex := text.from(2)
return none unless hex.length == 3 or hex.length == 6
if hex.length == 3
hex = hex[1]++hex[1]++hex[2]++hex[2]++hex[3]++hex[3]
n := Int32.parse("0x" ++ hex) or return none
return Color24Bit(n)
else if text.matches_pattern($Pat/{1-3 digit}/)
n := Int16.parse(text) or return none
if n >= 0 and n <= 255 return Color8Bit(n)
else if text == "black" return _Color.Color8Bit(0)
else if text == "red" return _Color.Color8Bit(1)
else if text == "green" return _Color.Color8Bit(2)
else if text == "yellow" return _Color.Color8Bit(3)
else if text == "blue" return _Color.Color8Bit(4)
else if text == "magenta" return _Color.Color8Bit(5)
else if text == "cyan" return _Color.Color8Bit(6)
else if text == "white" return _Color.Color8Bit(7)
else if text == "default" return _Color.Default
else if text == "BLACK" return _Color.Bright(0)
else if text == "RED" return _Color.Bright(1)
else if text == "GREEN" return _Color.Bright(2)
else if text == "YELLOW" return _Color.Bright(3)
else if text == "BLUE" return _Color.Bright(4)
else if text == "MAGENTA" return _Color.Bright(5)
else if text == "CYAN" return _Color.Bright(6)
else if text == "WHITE" return _Color.Bright(7)
return none
func fg(c:_Color -> Text)
when c is Color8Bit(color)
if color >= 0 and color <= 7 return "$(30+color)"
else if color >= 0 and color <= 255 return "38;5;$color"
is Color24Bit(hex)
if hex >= 0 and hex <= 0xFFFFFF
return "38;2;$((hex >> 16) and 0xFF);$((hex >> 8) and 0xFF);$((hex >> 0) and 0xFF)"
is Bright(color)
if color <= 7 return "$(90+color)"
is Default
return "39"
fail("Invalid foreground color: '$c'")
func bg(c:_Color -> Text)
when c is Color8Bit(color)
if color >= 0 and color <= 7 return "$(40+color)"
else if color >= 0 and color <= 255 return "48;5;$color"
is Color24Bit(hex)
if hex >= 0 and hex <= 0xFFFFFF
return "48;2;$((hex >> 16) and 0xFF);$((hex >> 8) and 0xFF);$((hex >> 0) and 0xFF)"
is Bright(color)
if color <= 7 return "$(90+color)"
is Default
return "49"
fail("Invalid background color: '$c'")
func underline(c:_Color -> Text)
when c is Color8Bit(color)
if color >= 0 and color <= 255 return "58;5;$color"
is Color24Bit(hex)
if hex >= 0 and hex <= 0xFFFFFF
return "58;2;$((hex >> 16) and 0xFF);$((hex >> 8) and 0xFF);$((hex >> 0) and 0xFF)"
is Default
return "59"
is Bright(color)
pass
fail("Invalid underline color: '$c'")
func _toggle(sequences:&[Text], cur,new:Bool, apply,unapply:Text; inline)
if new and not cur
sequences.insert(apply)
else if cur and not new
sequences.insert(unapply)
func _toggle2(sequences:&[Text], cur1,cur2,new1,new2:Bool, apply1,apply2,unapply:Text; inline)
return if new1 == cur1 and new2 == cur2
if (cur1 and not new1) or (cur2 and not new2) # Gotta wipe at least one
sequences.insert(unapply)
cur1, cur2 = no, no # Wiped out
if new1 and not cur1
sequences.insert(apply1)
if new2 and not cur2
sequences.insert(apply2)
struct _TermState(
bold=no, dim=no, italic=no, underline=no, blink=no,
reverse=no, conceal=no, strikethrough=no, fraktur=no, frame=no,
encircle=no, overline=no, superscript=no, subscript=no,
bg=_Color.Default, fg=_Color.Default, underline_color=_Color.Default,
)
func apply(old,new:_TermState -> Text)
sequences : &[Text] = &[]
_toggle2(sequences, old.bold, old.dim, new.bold, new.dim, "1", "2", "22")
_toggle2(sequences, old.italic, old.fraktur, new.italic, new.fraktur, "3", "20", "23")
_toggle(sequences, old.underline, new.underline, "4", "24")
_toggle(sequences, old.blink, new.blink, "5", "25")
_toggle(sequences, old.reverse, new.reverse, "7", "27")
_toggle(sequences, old.conceal, new.conceal, "8", "28")
_toggle(sequences, old.strikethrough, new.strikethrough, "9", "29")
_toggle2(sequences, old.frame, old.encircle, new.frame, new.frame, "51", "52", "54")
_toggle(sequences, old.overline, new.overline, "53", "55")
_toggle2(sequences, old.subscript, old.subscript, new.superscript, new.superscript, "73", "74", "75")
if new.bg != old.bg
sequences.insert(new.bg.bg())
if new.fg != old.fg
sequences.insert(new.fg.fg())
if new.underline_color != old.underline_color
sequences.insert(new.underline_color.underline())
if sequences.length == 0
return ""
return CSI ++ ";".join(sequences) ++ "m"
func _add_ansi_sequences(text:Text, prev_state:_TermState -> Text)
if text == "lparen" return "("
else if text == "rparen" return ")"
else if text == "@" or text == "at" return "@"
parts := (
text.pattern_captures($Pat/{0+..}:{0+..}/) or
return "@("++_for_terminal(Colorful.from_text(text), prev_state)++")"
)
attributes := parts[1].split_pattern($Pat/{0+space},{0+space}/)
new_state := prev_state
for attr in attributes
if attr.starts_with("fg=")
new_state.fg = _Color.from_text(attr.from(4))!
else if attr.starts_with("bg=")
new_state.bg = _Color.from_text(attr.from(4))!
else if attr.starts_with("ul=")
new_state.underline_color = _Color.from_text(attr.from(4))!
else if color := _Color.from_text(attr)
new_state.fg = color
else if attr == "b" or attr == "bold"
new_state.bold = yes
else if attr == "d" or attr == "dim"
new_state.dim = yes
else if attr == "i" or attr == "italic"
new_state.italic = yes
else if attr == "u" or attr == "underline"
new_state.underline = yes
else if attr == "B" or attr == "blink"
new_state.blink = yes
else if attr == "r" or attr == "reverse"
new_state.reverse = yes
else if attr == "fraktur"
new_state.fraktur = yes
else if attr == "frame"
new_state.frame = yes
else if attr == "encircle"
new_state.encircle = yes
else if attr == "overline"
new_state.overline = yes
else if attr == "super" or attr == "superscript"
new_state.superscript = yes
else if attr == "sub" or attr == "subscript"
new_state.subscript = yes
else
fail("Invalid attribute: '$attr'")
result := prev_state.apply(new_state)
result ++= parts[2].map_pattern(recursive=no, $Pat/@(?)/, func(m:PatternMatch) _add_ansi_sequences(m.captures[1], new_state))
result ++= new_state.apply(prev_state)
return result
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