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import math
import options
import os
import tables
import terminal
import bindings/termcap
import buffer/cell
import config/config
import io/window
import types/color
#TODO switch from termcap...
type
TermcapCap = enum
ce # clear till end of line
cd # clear display
cm # cursor move
ti # terminal init (=smcup)
te # terminal end (=rmcup)
so # start standout mode
md # start bold mode
us # start underline mode
mr # start reverse mode
mb # start blink mode
ue # end underline mode
se # end standout mode
me # end all formatting modes
LE # cursor left %1 characters
RI # cursor right %1 characters
Termcap = ref object
bp: array[1024, uint8]
funcstr: array[256, uint8]
caps: array[TermcapCap, cstring]
Terminal* = ref TerminalObj
TerminalObj = object
config: Config
infile: File
outfile: File
cleared: bool
canvas: FixedGrid
pcanvas: FixedGrid
attrs*: WindowAttributes
mincontrast: float
colormode: ColorMode
formatmode: FormatMode
smcup: bool
tc: Termcap
tname: string
func hascap(term: Terminal, c: TermcapCap): bool = term.tc.caps[c] != nil
func cap(term: Terminal, c: TermcapCap): string = $term.tc.caps[c]
func ccap(term: Terminal, c: TermcapCap): cstring = term.tc.caps[c]
template CSI*(s: varargs[string, `$`]): string =
var r = "\e["
var first = true
for x in s:
if not first:
r &= ";"
first = false
r &= x
r
when not termcap_found:
template DECSET(s: varargs[string, `$`]): string =
var r = "\e[?"
var first = true
for x in s:
if not first:
r &= ";"
first = false
r &= x
r & "h"
template DECRST(s: varargs[string, `$`]): string =
var r = "\e[?"
var first = true
for x in s:
if not first:
r &= ";"
first = false
r &= x
r & "l"
template SMCUP(): string = DECSET(1049)
template RMCUP(): string = DECRST(1049)
template HVP(s: varargs[string, `$`]): string =
CSI(s) & "f"
template EL(s: varargs[string, `$`]): string =
CSI(s) & "K"
template SGR*(s: varargs[string, `$`]): string =
CSI(s) & "m"
const ANSIColorMap = [
ColorsRGB["black"],
ColorsRGB["red"],
ColorsRGB["green"],
ColorsRGB["yellow"],
ColorsRGB["blue"],
ColorsRGB["magenta"],
ColorsRGB["cyan"],
ColorsRGB["white"],
]
var goutfile: File
proc putc(c: char): cint {.cdecl.} =
goutfile.write(c)
proc write*(term: Terminal, s: string) =
when termcap_found:
discard tputs(cstring(s), cint(s.len), putc)
else:
term.outfile.write(s)
proc flush*(term: Terminal) =
term.outfile.flushFile()
proc cursorGoto(term: Terminal, x, y: int): string =
when termcap_found:
return $tgoto(term.ccap cm, cint(x), cint(y))
else:
return HVP(y, x)
proc clearEnd(term: Terminal): string =
when termcap_found:
return term.cap ce
else:
return EL()
proc isatty(term: Terminal): bool =
term.infile != nil and term.infile.isatty() and term.outfile.isatty()
proc resetFormat(term: Terminal): string =
when termcap_found:
if term.isatty():
return term.cap me
return SGR()
else:
return SGR()
proc startFormat(term: Terminal, flag: FormatFlags): string =
when termcap_found:
if term.isatty():
case flag
of FLAG_BOLD: return term.cap md
of FLAG_UNDERLINE: return term.cap us
of FLAG_REVERSE: return term.cap mr
of FLAG_BLINK: return term.cap mb
else: discard
return SGR(FormatCodes[flag].s)
proc endFormat(term: Terminal, flag: FormatFlags): string =
when termcap_found:
if flag == FLAG_UNDERLINE and term.isatty():
return term.cap ue
return SGR(FormatCodes[flag].e)
#TODO get rid of these
proc setCursor*(term: Terminal, x, y: int) =
term.write(term.cursorGoto(x, y))
proc cursorBackward*(term: Terminal, i: int) =
if i > 0:
if i == 1:
term.write("\b")
else:
when termcap_found:
term.write($tgoto(term.ccap LE, 0, cint(i)))
else:
term.outfile.cursorBackward(i)
proc cursorForward*(term: Terminal, i: int) =
if i > 0:
when termcap_found:
term.write($tgoto(term.ccap RI, 0, cint(i)))
else:
term.outfile.cursorForward(i)
proc cursorBegin*(term: Terminal) =
term.write("\r")
proc enableAltScreen(term: Terminal): string =
when termcap_found:
if term.hascap ti:
term.write($term.cap ti)
else:
return SMCUP()
proc disableAltScreen(term: Terminal): string =
when termcap_found:
if term.hascap te:
term.write($term.cap te)
else:
return RMCUP()
proc distance(a, b: CellColor): float =
let a = if a.rgb:
a.rgbcolor
elif a == defaultColor:
ColorsRGB["black"]
else:
ANSIColorMap[a.color mod 10]
let b = if b.rgb:
b.rgbcolor
elif b == defaultColor:
ColorsRGB["white"]
else:
ANSIColorMap[b.color mod 10]
sqrt(float((a.r - b.r) ^ 2 + (a.g - b.b) ^ 2 + (a.g - b.g) ^ 2))
proc invert(color: CellColor, bg: bool): CellColor =
if color == defaultColor:
if bg:
return ColorsRGB["white"].cellColor()
else:
return ColorsRGB["black"].cellColor()
elif color.rgb:
return RGBColor(0xFFFFFF - cast[uint32](color.rgbcolor)).cellColor()
else:
return RGBColor(0xFFFFFF - uint32(ANSIColorMap[color.color mod 10])).cellColor()
# Use euclidian distance to quantize RGB colors.
proc approximateANSIColor(rgb: RGBColor, exclude = -1): int =
var a = 0
var n = -1
for i in 0 .. ANSIColorMap.high:
if i == exclude: continue
let color = ANSIColorMap[i]
if color == rgb: return i
let b = (color.r - rgb.r) ^ 2 + (color.g - rgb.b) ^ 2 + (color.g - rgb.g) ^ 2
if n == -1 or b < a:
n = i
a = b
return n
proc processFormat*(term: Terminal, format: var Format, cellf: Format): string =
for flag in FormatFlags:
if flag in term.formatmode:
if flag in format.flags and flag notin cellf.flags:
result &= term.endFormat(flag)
var cellf = cellf
if term.mincontrast >= 0 and distance(cellf.bgcolor, cellf.fgcolor) <= term.mincontrast:
cellf.fgcolor = invert(cellf.fgcolor, false)
if distance(cellf.bgcolor, cellf.fgcolor) <= term.mincontrast:
cellf.fgcolor = defaultColor
cellf.bgcolor = defaultColor
case term.colormode
of ANSI, EIGHT_BIT:
if cellf.bgcolor.rgb:
let color = approximateANSIColor(cellf.bgcolor.rgbcolor)
if color == 0: # black
cellf.bgcolor = defaultColor
else:
cellf.bgcolor = ColorsANSIBg[color]
if cellf.fgcolor.rgb:
if cellf.bgcolor == defaultColor:
var color = approximateANSIColor(cellf.fgcolor.rgbcolor)
if color == 0:
color = 7
if color == 7: # white
cellf.fgcolor = defaultColor
else:
cellf.fgcolor = ColorsANSIFg[color]
else:
cellf.fgcolor = if int(cellf.bgcolor.color) - 40 < 4:
defaultColor
else:
ColorsANSIFg[7]
of MONOCHROME:
cellf.fgcolor = defaultColor
cellf.bgcolor = defaultColor
of TRUE_COLOR: discard
if cellf.fgcolor != format.fgcolor:
var color = cellf.fgcolor
if color.rgb:
let rgb = color.rgbcolor
result &= SGR(38, 2, rgb.r, rgb.g, rgb.b)
elif color == defaultColor:
result &= term.resetFormat()
format = newFormat()
else:
result &= SGR(color.color)
if cellf.bgcolor != format.bgcolor:
var color = cellf.bgcolor
if color.rgb:
let rgb = color.rgbcolor
result &= SGR(48, 2, rgb.r, rgb.g, rgb.b)
elif color == defaultColor:
result &= term.resetFormat()
format = newFormat()
else:
result &= SGR(color.color)
for flag in FormatFlags:
if flag in term.formatmode:
if flag notin format.flags and flag in cellf.flags:
result &= term.startFormat(flag)
format = cellf
proc windowChange*(term: Terminal, attrs: WindowAttributes) =
term.attrs = attrs
term.canvas = newFixedGrid(attrs.width, attrs.height)
term.cleared = false
func generateFullOutput(term: Terminal, grid: FixedGrid): string =
var format = newFormat()
result &= term.cursorGoto(0, 0)
result &= term.resetFormat()
for y in 0 ..< grid.height:
var w = 0
for x in 0 ..< grid.width:
while w < x:
result &= " "
inc w
let cell = grid[y * grid.width + x]
result &= term.processFormat(format, cell.format)
result &= cell.str
w += cell.width()
result &= term.clearEnd()
if y != grid.height - 1:
result &= "\r\n"
func generateSwapOutput(term: Terminal, grid: FixedGrid, prev: FixedGrid): string =
var format = newFormat()
var x = 0
var w = 0
var line = ""
var lr = false
for i in 0 ..< grid.cells.len:
while w < x:
line &= " "
inc w
if x >= grid.width:
format = newFormat()
if lr:
result &= term.cursorGoto(0, i div grid.width - 1)
result &= term.resetFormat()
result &= term.clearEnd()
result &= line
lr = false
x = 0
w = 0
line = ""
lr = lr or (grid[i] != prev[i])
line &= term.processFormat(format, grid.cells[i].format)
line &= grid.cells[i].str
w += grid.cells[i].width()
inc x
if lr:
result &= term.cursorGoto(0, grid.height - 1)
result &= term.resetFormat()
result &= term.clearEnd()
result &= line
proc hideCursor*(term: Terminal) =
term.outfile.hideCursor()
proc showCursor*(term: Terminal) =
term.outfile.showCursor()
func emulateOverline(term: Terminal): bool =
term.config.emulateoverline and FLAG_OVERLINE notin term.formatmode and
FLAG_UNDERLINE in term.formatmode
proc writeGrid*(term: Terminal, grid: FixedGrid, x = 0, y = 0) =
for ly in y ..< y + grid.height:
for lx in x ..< x + grid.width:
let i = ly * term.canvas.width + lx
term.canvas[i] = grid[(ly - y) * grid.width + (lx - x)]
if i >= term.canvas.width and FLAG_OVERLINE in term.canvas[i].format.flags and term.emulateOverline:
let w = grid[(ly - y) * grid.width + (lx - x)].width()
let s = i - term.canvas.width
var j = s
while j < term.canvas.len and j < s + w:
let cell = addr term.canvas[j]
cell.format.flags.incl(FLAG_UNDERLINE)
if cell.str == "":
cell.str = " "
if cell.str == " ":
cell.format.fgcolor = grid[(ly - y) * grid.width + (lx - x)].format.fgcolor
j += cell[].width()
proc outputGrid*(term: Terminal) =
term.outfile.write(term.resetFormat())
if term.config.forceclear or not term.cleared:
term.outfile.write(term.generateFullOutput(term.canvas))
term.cleared = true
else:
term.outfile.write(term.generateSwapOutput(term.canvas, term.pcanvas))
term.pcanvas = term.canvas
proc clearCanvas*(term: Terminal) =
term.cleared = false
when defined(posix):
import posix
import termios
# see https://viewsourcecode.org/snaptoken/kilo/02.enteringRawMode.html
var orig_termios: Termios
var stdin_fileno: FileHandle
proc disableRawMode() {.noconv.} =
discard tcSetAttr(stdin_fileno, TCSAFLUSH, addr orig_termios)
proc enableRawMode(fileno: FileHandle) =
stdin_fileno = fileno
discard tcGetAttr(fileno, addr orig_termios)
var raw = orig_termios
raw.c_iflag = raw.c_iflag and not (BRKINT or ICRNL or INPCK or ISTRIP or IXON)
raw.c_oflag = raw.c_oflag and not (OPOST)
raw.c_cflag = raw.c_cflag or CS8
raw.c_lflag = raw.c_lflag and not (ECHO or ICANON or ISIG or IEXTEN)
discard tcSetAttr(fileno, TCSAFLUSH, addr raw)
var orig_flags: cint
var stdin_unblocked = false
proc unblockStdin*(fileno: FileHandle) =
orig_flags = fcntl(fileno, F_GETFL, 0)
let flags = orig_flags or O_NONBLOCK
discard fcntl(fileno, F_SETFL, flags)
stdin_unblocked = true
proc restoreStdin*(fileno: FileHandle) =
if stdin_unblocked:
discard fcntl(fileno, F_SETFL, orig_flags)
stdin_unblocked = false
else:
proc disableRawMode() =
discard
proc enableRawMode(fileno: FileHandle) =
discard
proc unblockStdin*(): cint =
discard
proc restoreStdin*(flags: cint) =
discard
proc quit*(term: Terminal) =
if term.isatty():
disableRawMode()
if term.smcup:
term.write(term.disableAltScreen())
else:
term.write(term.cursorGoto(0, term.attrs.height - 1))
term.showCursor()
term.cleared = false
term.flush()
when termcap_found:
proc loadTermcap(term: Terminal) =
assert goutfile == nil
goutfile = term.outfile
let tc = new Termcap
if tgetent(cast[cstring](addr tc.bp), cstring(term.tname)) == 1:
term.tc = tc
for id in TermcapCap:
tc.caps[id] = tgetstr(cstring($id), cast[ptr cstring](addr tc.funcstr))
else:
raise newException(Defect, "Failed to load termcap description for terminal " & term.tname)
proc detectTermAttributes(term: Terminal) =
term.tname = getEnv("TERM")
if term.tname == "":
term.tname = "dosansi"
when termcap_found:
if term.isatty():
term.loadTermcap()
if term.tc != nil:
term.smcup = term.hascap(ti)
term.formatmode = {FLAG_ITALIC, FLAG_OVERLINE, FLAG_STRIKE}
if term.hascap(us):
term.formatmode.incl(FLAG_UNDERLINE)
if term.hascap(md):
term.formatmode.incl(FLAG_BOLD)
if term.hascap(mr):
term.formatmode.incl(FLAG_REVERSE)
if term.hascap(mb):
term.formatmode.incl(FLAG_BLINK)
else:
if term.isatty():
term.smcup = true
term.formatmode = {low(FormatFlags)..high(FormatFlags)}
if term.config.colormode.isSome:
term.colormode = term.config.colormode.get
elif term.isatty():
term.colormode = ANSI
let colorterm = getEnv("COLORTERM")
case colorterm
of "24bit", "truecolor": term.colormode = TRUE_COLOR
if term.config.formatmode.isSome:
term.formatmode = term.config.formatmode.get
for fm in FormatFlags:
if fm in term.config.noformatmode:
term.formatmode.excl(fm)
if term.isatty() and term.config.altscreen.isSome:
term.smcup = term.config.altscreen.get
term.mincontrast = term.config.mincontrast
proc start*(term: Terminal, infile: File) =
term.infile = infile
if term.isatty():
enableRawMode(infile.getFileHandle())
term.detectTermAttributes()
if term.smcup:
term.write(term.enableAltScreen())
proc restart*(term: Terminal) =
if term.isatty():
enableRawMode(term.infile.getFileHandle())
if term.smcup:
term.write(term.enableAltScreen())
proc newTerminal*(outfile: File, config: Config, attrs: WindowAttributes): Terminal =
let term = new Terminal
term.outfile = outfile
term.config = config
term.windowChange(attrs)
return term