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Diffstat (limited to 'lib/pure/terminal.nim')
| -rw-r--r--[-rwxr-xr-x] | lib/pure/terminal.nim | 1339 |
1 files changed, 1031 insertions, 308 deletions
diff --git a/lib/pure/terminal.nim b/lib/pure/terminal.nim index 42bd80cb4..53b3d61da 100755..100644 --- a/lib/pure/terminal.nim +++ b/lib/pure/terminal.nim @@ -1,310 +1,1033 @@ -# -# -# Nimrod's Runtime Library -# (c) Copyright 2009 Andreas Rumpf -# -# See the file "copying.txt", included in this -# distribution, for details about the copyright. -# - -## This module contains a few procedures to control the *terminal* -## (also called *console*). On UNIX, the implementation simply uses ANSI escape -## sequences and does not depend on any other module, on Windows it uses the -## Windows API. -## Changing the style is permanent even after program termination! Use the -## code ``system.addQuitProc(resetAttributes)`` to restore the defaults. - -when defined(windows): - import windows, os - - var - conHandle: THandle - # = createFile("CONOUT$", GENERIC_WRITE, 0, nil, OPEN_ALWAYS, 0, 0) - - block: - var hTemp = GetStdHandle(STD_OUTPUT_HANDLE()) - if DuplicateHandle(GetCurrentProcess(), hTemp, GetCurrentProcess(), - addr(conHandle), 0, 1, DUPLICATE_SAME_ACCESS) == 0: - OSError() - - proc getCursorPos(): tuple [x,y: int] = - var c: TCONSOLE_SCREEN_BUFFER_INFO - if GetConsoleScreenBufferInfo(conHandle, addr(c)) == 0: OSError() - return (int(c.dwCursorPosition.x), int(c.dwCursorPosition.y)) - - proc getAttributes(): int16 = - var c: TCONSOLE_SCREEN_BUFFER_INFO - # workaround Windows bugs: try several times - if GetConsoleScreenBufferInfo(conHandle, addr(c)) != 0: - return c.wAttributes - else: - OSError() - return 0x70'i16 # ERROR: return white background, black text - - var - oldAttr = getAttributes() - -proc setCursorPos*(x, y: int) = - ## sets the terminal's cursor to the (x,y) position. (0,0) is the - ## upper left of the screen. - when defined(windows): - var c: TCoord - c.x = int16(x) - c.y = int16(y) - if SetConsoleCursorPosition(conHandle, c) == 0: OSError() - else: - stdout.write("\e[" & $y & ';' & $x & 'f') - -proc setCursorXPos*(x: int) = - ## sets the terminal's cursor to the x position. The y position is - ## not changed. - when defined(windows): - var scrbuf: TCONSOLE_SCREEN_BUFFER_INFO - var hStdout = conHandle - if GetConsoleScreenBufferInfo(hStdout, addr(scrbuf)) == 0: OSError() - var origin = scrbuf.dwCursorPosition - origin.x = int16(x) - if SetConsoleCursorPosition(conHandle, origin) == 0: OSError() - else: - stdout.write("\e[" & $x & 'G') +# +# +# Nim's Runtime Library +# (c) Copyright 2012 Andreas Rumpf +# +# See the file "copying.txt", included in this +# distribution, for details about the copyright. +# + +## This module contains a few procedures to control the *terminal* +## (also called *console*). On UNIX, the implementation simply uses ANSI escape +## sequences and does not depend on any other module, on Windows it uses the +## Windows API. +## Changing the style is permanent even after program termination! Use the +## code `exitprocs.addExitProc(resetAttributes)` to restore the defaults. +## Similarly, if you hide the cursor, make sure to unhide it with +## `showCursor` before quitting. +## +## Progress bar +## ============ +## +## Basic progress bar example: +runnableExamples("-r:off"): + import std/[os, strutils] + + for i in 0..100: + stdout.styledWriteLine(fgRed, "0% ", fgWhite, '#'.repeat i, if i > 50: fgGreen else: fgYellow, "\t", $i , "%") + sleep 42 + cursorUp 1 + eraseLine() + + stdout.resetAttributes() + +##[ +## Playing with colorful and styled text +]## + +## Procs like `styledWriteLine`, `styledEcho` etc. have a temporary effect on +## text parameters. Style parameters only affect the text parameter right after them. +## After being called, these procs will reset the default style of the terminal. +## While `setBackGroundColor`, `setForeGroundColor` etc. have a lasting +## influence on the terminal, you can use `resetAttributes` to +## reset the default style of the terminal. +runnableExamples("-r:off"): + stdout.styledWriteLine({styleBright, styleBlink, styleUnderscore}, "styled text ") + stdout.styledWriteLine(fgRed, "red text ") + stdout.styledWriteLine(fgWhite, bgRed, "white text in red background") + stdout.styledWriteLine(" ordinary text without style ") + + stdout.setBackGroundColor(bgCyan, true) + stdout.setForeGroundColor(fgBlue) + stdout.write("blue text in cyan background") + stdout.resetAttributes() + + # You can specify multiple text parameters. Style parameters + # only affect the text parameter right after them. + styledEcho styleBright, fgGreen, "[PASS]", resetStyle, fgGreen, " Yay!" + + stdout.styledWriteLine(fgRed, "red text ", styleBright, "bold red", fgDefault, " bold text") + +import std/macros +import std/strformat +from std/strutils import toLowerAscii, `%`, parseInt +import std/colors + +when defined(windows): + import std/winlean + +when defined(nimPreviewSlimSystem): + import std/[syncio, assertions] + +type + PTerminal = ref object + trueColorIsSupported: bool + trueColorIsEnabled: bool + fgSetColor: bool + when defined(windows): + hStdout: Handle + hStderr: Handle + oldStdoutAttr: int16 + oldStderrAttr: int16 + +var gTerm {.threadvar.}: owned(PTerminal) + +when defined(windows) and defined(consoleapp): + proc newTerminal(): owned(PTerminal) {.gcsafe, raises: [OSError].} +else: + proc newTerminal(): owned(PTerminal) {.gcsafe, raises: [].} + +proc getTerminal(): PTerminal {.inline.} = + if isNil(gTerm): + gTerm = newTerminal() + result = gTerm + +const + fgPrefix = "\e[38;2;" + bgPrefix = "\e[48;2;" + ansiResetCode* = "\e[0m" + getPos = "\e[6n" + stylePrefix = "\e[" + +when defined(windows): + import std/[winlean, os] + + const + DUPLICATE_SAME_ACCESS = 2 + FOREGROUND_BLUE = 1 + FOREGROUND_GREEN = 2 + FOREGROUND_RED = 4 + FOREGROUND_INTENSITY = 8 + BACKGROUND_BLUE = 16 + BACKGROUND_GREEN = 32 + BACKGROUND_RED = 64 + BACKGROUND_INTENSITY = 128 + FOREGROUND_RGB = FOREGROUND_RED or FOREGROUND_GREEN or FOREGROUND_BLUE + BACKGROUND_RGB = BACKGROUND_RED or BACKGROUND_GREEN or BACKGROUND_BLUE + + ENABLE_VIRTUAL_TERMINAL_PROCESSING = 0x0004 + + type + SHORT = int16 + COORD = object + x: SHORT + y: SHORT + + SMALL_RECT = object + left: SHORT + top: SHORT + right: SHORT + bottom: SHORT + + CONSOLE_SCREEN_BUFFER_INFO = object + dwSize: COORD + dwCursorPosition: COORD + wAttributes: int16 + srWindow: SMALL_RECT + dwMaximumWindowSize: COORD + + CONSOLE_CURSOR_INFO = object + dwSize: DWORD + bVisible: WINBOOL + + proc duplicateHandle(hSourceProcessHandle: Handle, hSourceHandle: Handle, + hTargetProcessHandle: Handle, lpTargetHandle: ptr Handle, + dwDesiredAccess: DWORD, bInheritHandle: WINBOOL, + dwOptions: DWORD): WINBOOL{.stdcall, dynlib: "kernel32", + importc: "DuplicateHandle".} + proc getCurrentProcess(): Handle{.stdcall, dynlib: "kernel32", + importc: "GetCurrentProcess".} + proc getConsoleScreenBufferInfo(hConsoleOutput: Handle, + lpConsoleScreenBufferInfo: ptr CONSOLE_SCREEN_BUFFER_INFO): WINBOOL{.stdcall, + dynlib: "kernel32", importc: "GetConsoleScreenBufferInfo".} + + proc getConsoleCursorInfo(hConsoleOutput: Handle, + lpConsoleCursorInfo: ptr CONSOLE_CURSOR_INFO): WINBOOL{. + stdcall, dynlib: "kernel32", importc: "GetConsoleCursorInfo".} + + proc setConsoleCursorInfo(hConsoleOutput: Handle, + lpConsoleCursorInfo: ptr CONSOLE_CURSOR_INFO): WINBOOL{. + stdcall, dynlib: "kernel32", importc: "SetConsoleCursorInfo".} + + proc terminalWidthIoctl*(handles: openArray[Handle]): int = + var csbi: CONSOLE_SCREEN_BUFFER_INFO + for h in handles: + if getConsoleScreenBufferInfo(h, addr csbi) != 0: + return int(csbi.srWindow.right - csbi.srWindow.left + 1) + return 0 + + proc terminalHeightIoctl*(handles: openArray[Handle]): int = + var csbi: CONSOLE_SCREEN_BUFFER_INFO + for h in handles: + if getConsoleScreenBufferInfo(h, addr csbi) != 0: + return int(csbi.srWindow.bottom - csbi.srWindow.top + 1) + return 0 + + proc terminalWidth*(): int = + ## Returns the terminal width in columns. + var w: int = 0 + w = terminalWidthIoctl([getStdHandle(STD_INPUT_HANDLE), + getStdHandle(STD_OUTPUT_HANDLE), + getStdHandle(STD_ERROR_HANDLE)]) + if w > 0: return w + return 80 + + proc terminalHeight*(): int = + ## Returns the terminal height in rows. + var h: int = 0 + h = terminalHeightIoctl([getStdHandle(STD_INPUT_HANDLE), + getStdHandle(STD_OUTPUT_HANDLE), + getStdHandle(STD_ERROR_HANDLE)]) + if h > 0: return h + return 0 + + proc setConsoleCursorPosition(hConsoleOutput: Handle, + dwCursorPosition: COORD): WINBOOL{. + stdcall, dynlib: "kernel32", importc: "SetConsoleCursorPosition".} + + proc fillConsoleOutputCharacter(hConsoleOutput: Handle, cCharacter: char, + nLength: DWORD, dwWriteCoord: COORD, + lpNumberOfCharsWritten: ptr DWORD): WINBOOL{. + stdcall, dynlib: "kernel32", importc: "FillConsoleOutputCharacterA".} + + proc fillConsoleOutputAttribute(hConsoleOutput: Handle, wAttribute: int16, + nLength: DWORD, dwWriteCoord: COORD, + lpNumberOfAttrsWritten: ptr DWORD): WINBOOL{. + stdcall, dynlib: "kernel32", importc: "FillConsoleOutputAttribute".} + + proc setConsoleTextAttribute(hConsoleOutput: Handle, + wAttributes: int16): WINBOOL{. + stdcall, dynlib: "kernel32", importc: "SetConsoleTextAttribute".} + + proc getConsoleMode(hConsoleHandle: Handle, dwMode: ptr DWORD): WINBOOL{. + stdcall, dynlib: "kernel32", importc: "GetConsoleMode".} + + proc setConsoleMode(hConsoleHandle: Handle, dwMode: DWORD): WINBOOL{. + stdcall, dynlib: "kernel32", importc: "SetConsoleMode".} + + proc getCursorPos(h: Handle): tuple [x, y: int] = + var c: CONSOLE_SCREEN_BUFFER_INFO + if getConsoleScreenBufferInfo(h, addr(c)) == 0: + raiseOSError(osLastError()) + return (int(c.dwCursorPosition.x), int(c.dwCursorPosition.y)) + + proc getCursorPos*(): tuple [x, y: int] {.raises: [ValueError, IOError, OSError].} = + return getCursorPos(getStdHandle(STD_OUTPUT_HANDLE)) + + proc setCursorPos(h: Handle, x, y: int) = + var c: COORD + c.x = int16(x) + c.y = int16(y) + if setConsoleCursorPosition(h, c) == 0: + raiseOSError(osLastError()) + + proc getAttributes(h: Handle): int16 = + var c: CONSOLE_SCREEN_BUFFER_INFO + # workaround Windows bugs: try several times + if getConsoleScreenBufferInfo(h, addr(c)) != 0: + return c.wAttributes + return 0x70'i16 # ERROR: return white background, black text + + proc initTerminal(term: PTerminal) = + var hStdoutTemp = getStdHandle(STD_OUTPUT_HANDLE) + if duplicateHandle(getCurrentProcess(), hStdoutTemp, getCurrentProcess(), + addr(term.hStdout), 0, 1, DUPLICATE_SAME_ACCESS) == 0: + when defined(consoleapp): + raiseOSError(osLastError()) + var hStderrTemp = getStdHandle(STD_ERROR_HANDLE) + if duplicateHandle(getCurrentProcess(), hStderrTemp, getCurrentProcess(), + addr(term.hStderr), 0, 1, DUPLICATE_SAME_ACCESS) == 0: + when defined(consoleapp): + raiseOSError(osLastError()) + term.oldStdoutAttr = getAttributes(term.hStdout) + term.oldStderrAttr = getAttributes(term.hStderr) + + template conHandle(f: File): Handle = + let term = getTerminal() + if f == stderr: term.hStderr else: term.hStdout + +else: + import std/[termios, posix, os, parseutils] + + proc setRaw(fd: FileHandle, time: cint = TCSAFLUSH) = + var mode: Termios + discard fd.tcGetAttr(addr mode) + mode.c_iflag = mode.c_iflag and not Cflag(BRKINT or ICRNL or INPCK or + ISTRIP or IXON) + mode.c_oflag = mode.c_oflag and not Cflag(OPOST) + mode.c_cflag = (mode.c_cflag and not Cflag(CSIZE or PARENB)) or CS8 + mode.c_lflag = mode.c_lflag and not Cflag(ECHO or ICANON or IEXTEN or ISIG) + mode.c_cc[VMIN] = 1.cuchar + mode.c_cc[VTIME] = 0.cuchar + discard fd.tcSetAttr(time, addr mode) + + proc getCursorPos*(): tuple [x, y: int] {.raises: [ValueError, IOError].} = + ## Returns cursor position (x, y) + ## writes to stdout and expects the terminal to respond via stdin + var + xStr = "" + yStr = "" + ch: char + ct: int + readX = false + + # use raw mode to ask terminal for cursor position + let fd = getFileHandle(stdin) + var oldMode: Termios + discard fd.tcGetAttr(addr oldMode) + fd.setRaw() + stdout.write(getPos) + flushFile(stdout) + + try: + # parse response format: [yyy;xxxR + while true: + let n = readBuffer(stdin, addr ch, 1) + if n == 0 or ch == 'R': + if xStr == "" or yStr == "": + raise newException(ValueError, "Got character position message that was missing data") + break + ct += 1 + if ct > 16: + raise newException(ValueError, "Got unterminated character position message from terminal") + if ch == ';': + readX = true + elif ch in {'0'..'9'}: + if readX: + xStr.add(ch) + else: + yStr.add(ch) + finally: + # restore previous terminal mode + discard fd.tcSetAttr(TCSADRAIN, addr oldMode) + + return (parseInt(xStr), parseInt(yStr)) + + proc terminalWidthIoctl*(fds: openArray[int]): int = + ## Returns terminal width from first fd that supports the ioctl. + + var win: IOctl_WinSize + for fd in fds: + if ioctl(cint(fd), TIOCGWINSZ, addr win) != -1: + return int(win.ws_col) + return 0 + + proc terminalHeightIoctl*(fds: openArray[int]): int = + ## Returns terminal height from first fd that supports the ioctl. + + var win: IOctl_WinSize + for fd in fds: + if ioctl(cint(fd), TIOCGWINSZ, addr win) != -1: + return int(win.ws_row) + return 0 + + var L_ctermid{.importc, header: "<stdio.h>".}: cint + + proc terminalWidth*(): int = + ## Returns some reasonable terminal width from either standard file + ## descriptors, controlling terminal, environment variables or tradition. + + # POSIX environment variable takes precendence. + # _COLUMNS_: This variable shall represent a decimal integer >0 used + # to indicate the user's preferred width in column positions for + # the terminal screen or window. If this variable is unset or null, + # the implementation determines the number of columns, appropriate + # for the terminal or window, in an unspecified manner. + # When COLUMNS is set, any terminal-width information implied by TERM + # is overridden. Users and conforming applications should not set COLUMNS + # unless they wish to override the system selection and produce output + # unrelated to the terminal characteristics. + # See POSIX Base Definitions Section 8.1 Environment Variable Definition + + var w: int + var s = getEnv("COLUMNS") # Try standard env var + if len(s) > 0 and parseSaturatedNatural(s, w) > 0 and w > 0: + return w + w = terminalWidthIoctl([0, 1, 2]) # Try standard file descriptors + if w > 0: return w + var cterm = newString(L_ctermid) # Try controlling tty + var fd = open(ctermid(cstring(cterm)), O_RDONLY) + if fd != -1: + w = terminalWidthIoctl([int(fd)]) + discard close(fd) + if w > 0: return w + return 80 # Finally default to venerable value + + proc terminalHeight*(): int = + ## Returns some reasonable terminal height from either standard file + ## descriptors, controlling terminal, environment variables or tradition. + ## Zero is returned if the height could not be determined. + + # POSIX environment variable takes precendence. + # _LINES_: This variable shall represent a decimal integer >0 used + # to indicate the user's preferred number of lines on a page or + # the vertical screen or window size in lines. A line in this case + # is a vertical measure large enough to hold the tallest character + # in the character set being displayed. If this variable is unset or null, + # the implementation determines the number of lines, appropriate + # for the terminal or window (size, terminal baud rate, and so on), + # in an unspecified manner. + # When LINES is set, any terminal-height information implied by TERM + # is overridden. Users and conforming applications should not set LINES + # unless they wish to override the system selection and produce output + # unrelated to the terminal characteristics. + # See POSIX Base Definitions Section 8.1 Environment Variable Definition + + var h: int + var s = getEnv("LINES") # Try standard env var + if len(s) > 0 and parseSaturatedNatural(s, h) > 0 and h > 0: + return h + h = terminalHeightIoctl([0, 1, 2]) # Try standard file descriptors + if h > 0: return h + var cterm = newString(L_ctermid) # Try controlling tty + var fd = open(ctermid(cstring(cterm)), O_RDONLY) + if fd != -1: + h = terminalHeightIoctl([int(fd)]) + discard close(fd) + if h > 0: return h + return 0 # Could not determine height + +proc terminalSize*(): tuple[w, h: int] = + ## Returns the terminal width and height as a tuple. Internally calls + ## `terminalWidth` and `terminalHeight`, so the same assumptions apply. + result = (terminalWidth(), terminalHeight()) + +when defined(windows): + proc setCursorVisibility(f: File, visible: bool) = + var ccsi: CONSOLE_CURSOR_INFO + let h = conHandle(f) + if getConsoleCursorInfo(h, addr(ccsi)) == 0: + raiseOSError(osLastError()) + ccsi.bVisible = if visible: 1 else: 0 + if setConsoleCursorInfo(h, addr(ccsi)) == 0: + raiseOSError(osLastError()) + +proc hideCursor*(f: File) = + ## Hides the cursor. + when defined(windows): + setCursorVisibility(f, false) + else: + f.write("\e[?25l") + +proc showCursor*(f: File) = + ## Shows the cursor. + when defined(windows): + setCursorVisibility(f, true) + else: + f.write("\e[?25h") + +proc setCursorPos*(f: File, x, y: int) = + ## Sets the terminal's cursor to the (x,y) position. + ## (0,0) is the upper left of the screen. + when defined(windows): + let h = conHandle(f) + setCursorPos(h, x, y) + else: + f.write(fmt"{stylePrefix}{y+1};{x+1}f") + +proc setCursorXPos*(f: File, x: int) = + ## Sets the terminal's cursor to the x position. + ## The y position is not changed. + when defined(windows): + let h = conHandle(f) + var scrbuf: CONSOLE_SCREEN_BUFFER_INFO + if getConsoleScreenBufferInfo(h, addr(scrbuf)) == 0: + raiseOSError(osLastError()) + var origin = scrbuf.dwCursorPosition + origin.x = int16(x) + if setConsoleCursorPosition(h, origin) == 0: + raiseOSError(osLastError()) + else: + f.write(fmt"{stylePrefix}{x+1}G") when defined(windows): - proc setCursorYPos*(y: int) = - ## sets the terminal's cursor to the y position. The x position is - ## not changed. **Warning**: This is not supported on UNIX! - when defined(windows): - var scrbuf: TCONSOLE_SCREEN_BUFFER_INFO - var hStdout = conHandle - if GetConsoleScreenBufferInfo(hStdout, addr(scrbuf)) == 0: OSError() - var origin = scrbuf.dwCursorPosition - origin.y = int16(y) - if SetConsoleCursorPosition(conHandle, origin) == 0: OSError() - else: - nil - -proc CursorUp*(count=1) = - ## Moves the cursor up by `count` rows. - when defined(windows): - var p = getCursorPos() - dec(p.y, count) - setCursorPos(p.x, p.y) - else: - stdout.write("\e[" & $count & 'A') - -proc CursorDown*(count=1) = - ## Moves the cursor down by `count` rows. - when defined(windows): - var p = getCursorPos() - inc(p.y, count) - setCursorPos(p.x, p.y) - else: - stdout.write("\e[" & $count & 'B') - -proc CursorForward*(count=1) = - ## Moves the cursor forward by `count` columns. - when defined(windows): - var p = getCursorPos() - inc(p.x, count) - setCursorPos(p.x, p.y) - else: - stdout.write("\e[" & $count & 'C') - -proc CursorBackward*(count=1) = - ## Moves the cursor backward by `count` columns. - when defined(windows): - var p = getCursorPos() - dec(p.x, count) - setCursorPos(p.x, p.y) - else: - stdout.write("\e[" & $count & 'D') - -when true: - nil -else: - proc EraseLineEnd* = - ## Erases from the current cursor position to the end of the current line. - when defined(windows): - nil - else: - stdout.write("\e[K") - - proc EraseLineStart* = - ## Erases from the current cursor position to the start of the current line. - when defined(windows): - nil - else: - stdout.write("\e[1K") - - proc EraseDown* = - ## Erases the screen from the current line down to the bottom of the screen. - when defined(windows): - nil - else: - stdout.write("\e[J") - - proc EraseUp* = - ## Erases the screen from the current line up to the top of the screen. - when defined(windows): - nil - else: - stdout.write("\e[1J") - -proc EraseLine* = - ## Erases the entire current line. - when defined(windows): - var scrbuf: TCONSOLE_SCREEN_BUFFER_INFO - var numwrote: DWORD - var hStdout = conHandle - if GetConsoleScreenBufferInfo(hStdout, addr(scrbuf)) == 0: OSError() - var origin = scrbuf.dwCursorPosition - origin.x = 0'i16 - if SetConsoleCursorPosition(conHandle, origin) == 0: OSError() - var ht = scrbuf.dwSize.Y - origin.Y - var wt = scrbuf.dwSize.X - origin.X - if FillConsoleOutputCharacter(hStdout,' ', ht*wt, - origin, addr(numwrote)) == 0: - OSError() - if FillConsoleOutputAttribute(hStdout, scrbuf.wAttributes, ht * wt, - scrbuf.dwCursorPosition, addr(numwrote)) == 0: - OSError() - else: - stdout.write("\e[2K") - setCursorXPos(0) - -proc EraseScreen* = - ## Erases the screen with the background colour and moves the cursor to home. - when defined(windows): - var scrbuf: TCONSOLE_SCREEN_BUFFER_INFO - var numwrote: DWORD - var origin: TCoord # is inititalized to 0, 0 - var hStdout = conHandle - if GetConsoleScreenBufferInfo(hStdout, addr(scrbuf)) == 0: OSError() - if FillConsoleOutputCharacter(hStdout, ' ', scrbuf.dwSize.X*scrbuf.dwSize.Y, - origin, addr(numwrote)) == 0: - OSError() - if FillConsoleOutputAttribute(hStdout, scrbuf.wAttributes, - scrbuf.dwSize.X * scrbuf.dwSize.Y, - origin, addr(numwrote)) == 0: - OSError() - setCursorXPos(0) - else: - stdout.write("\e[2J") - -proc ResetAttributes* {.noconv.} = - ## resets all attributes; it is advisable to register this as a quit proc - ## with ``system.addQuitProc(resetAttributes)``. - when defined(windows): - discard SetConsoleTextAttribute(conHandle, oldAttr) - else: - stdout.write("\e[0m") - -type - TStyle* = enum ## different styles for text output - styleBright = 1, ## bright text - styleDim, ## dim text - styleUnknown, ## unknown - styleUnderscore = 4, ## underscored text - styleBlink, ## blinking/bold text - styleReverse, ## unknown - styleHidden ## hidden text - -when not defined(windows): - var - gFG = 0 - gBG = 0 - -proc WriteStyled*(txt: string, style: set[TStyle] = {styleBright}) = - ## writes the text `txt` in a given `style`. - when defined(windows): - var a = 0'i16 - if styleBright in style: a = a or int16(FOREGROUND_INTENSITY) - if styleBlink in style: a = a or int16(BACKGROUND_INTENSITY) - if styleReverse in style: a = a or 0x4000'i16 # COMMON_LVB_REVERSE_VIDEO - if styleUnderscore in style: a = a or 0x8000'i16 # COMMON_LVB_UNDERSCORE - var old = getAttributes() - discard SetConsoleTextAttribute(conHandle, old or a) - stdout.write(txt) - discard SetConsoleTextAttribute(conHandle, old) - else: - for s in items(style): - stdout.write("\e[" & $ord(s) & 'm') - stdout.write(txt) - resetAttributes() - if gFG != 0: - stdout.write("\e[" & $ord(gFG) & 'm') - if gBG != 0: - stdout.write("\e[" & $ord(gBG) & 'm') - -type - TForegroundColor* = enum ## terminal's foreground colors - fgBlack = 30, ## black - fgRed, ## red - fgGreen, ## green - fgYellow, ## yellow - fgBlue, ## blue - fgMagenta, ## magenta - fgCyan, ## cyan - fgWhite ## white - - TBackgroundColor* = enum ## terminal's background colors - bgBlack = 40, ## black - bgRed, ## red - bgGreen, ## green - bgYellow, ## yellow - bgBlue, ## blue - bgMagenta, ## magenta - bgCyan, ## cyan - bgWhite ## white - -proc setForegroundColor*(fg: TForegroundColor, bright=false) = - ## sets the terminal's foreground color - when defined(windows): - var old = getAttributes() and not 0x0007 - if bright: - old = old or FOREGROUND_INTENSITY - const lookup: array [TForegroundColor, int] = [ - 0, - (FOREGROUND_RED), - (FOREGROUND_GREEN), - (FOREGROUND_RED or FOREGROUND_GREEN), - (FOREGROUND_BLUE), - (FOREGROUND_RED or FOREGROUND_BLUE), - (FOREGROUND_BLUE or FOREGROUND_GREEN), - (FOREGROUND_BLUE or FOREGROUND_GREEN or FOREGROUND_RED)] - discard SetConsoleTextAttribute(conHandle, toU16(old or lookup[fg])) - else: - gFG = ord(fg) - if bright: inc(gFG, 60) - stdout.write("\e[" & $gFG & 'm') - -proc setBackgroundColor*(bg: TBackgroundColor, bright=false) = - ## sets the terminal's background color - when defined(windows): - var old = getAttributes() and not 0x0070 - if bright: - old = old or BACKGROUND_INTENSITY - const lookup: array [TBackgroundColor, int] = [ - 0, - (BACKGROUND_RED), - (BACKGROUND_GREEN), - (BACKGROUND_RED or BACKGROUND_GREEN), - (BACKGROUND_BLUE), - (BACKGROUND_RED or BACKGROUND_BLUE), - (BACKGROUND_BLUE or BACKGROUND_GREEN), - (BACKGROUND_BLUE or BACKGROUND_GREEN or BACKGROUND_RED)] - discard SetConsoleTextAttribute(conHandle, toU16(old or lookup[bg])) - else: - gBG = ord(bg) - if bright: inc(gBG, 60) - stdout.write("\e[" & $gBG & 'm') - -when isMainModule: - system.addQuitProc(resetAttributes) - write(stdout, "never mind") - eraseLine() - #setCursorPos(2, 2) - writeStyled("styled text ", {styleBright, styleBlink, styleUnderscore}) - setBackGroundColor(bgCyan, true) - setForeGroundColor(fgBlue) - writeln(stdout, "ordinary text") - + proc setCursorYPos*(f: File, y: int) = + ## Sets the terminal's cursor to the y position. + ## The x position is not changed. + ## .. warning:: This is not supported on UNIX! + when defined(windows): + let h = conHandle(f) + var scrbuf: CONSOLE_SCREEN_BUFFER_INFO + if getConsoleScreenBufferInfo(h, addr(scrbuf)) == 0: + raiseOSError(osLastError()) + var origin = scrbuf.dwCursorPosition + origin.y = int16(y) + if setConsoleCursorPosition(h, origin) == 0: + raiseOSError(osLastError()) + else: + discard + +proc cursorUp*(f: File, count = 1) = + ## Moves the cursor up by `count` rows. + runnableExamples("-r:off"): + stdout.cursorUp(2) + write(stdout, "Hello World!") # anything written at that location will be erased/replaced with this + when defined(windows): + let h = conHandle(f) + var p = getCursorPos(h) + dec(p.y, count) + setCursorPos(h, p.x, p.y) + else: + f.write("\e[" & $count & 'A') + +proc cursorDown*(f: File, count = 1) = + ## Moves the cursor down by `count` rows. + runnableExamples("-r:off"): + stdout.cursorDown(2) + write(stdout, "Hello World!") # anything written at that location will be erased/replaced with this + when defined(windows): + let h = conHandle(f) + var p = getCursorPos(h) + inc(p.y, count) + setCursorPos(h, p.x, p.y) + else: + f.write(fmt"{stylePrefix}{count}B") + +proc cursorForward*(f: File, count = 1) = + ## Moves the cursor forward by `count` columns. + runnableExamples("-r:off"): + stdout.cursorForward(2) + write(stdout, "Hello World!") # anything written at that location will be erased/replaced with this + when defined(windows): + let h = conHandle(f) + var p = getCursorPos(h) + inc(p.x, count) + setCursorPos(h, p.x, p.y) + else: + f.write(fmt"{stylePrefix}{count}C") + +proc cursorBackward*(f: File, count = 1) = + ## Moves the cursor backward by `count` columns. + runnableExamples("-r:off"): + stdout.cursorBackward(2) + write(stdout, "Hello World!") # anything written at that location will be erased/replaced with this + when defined(windows): + let h = conHandle(f) + var p = getCursorPos(h) + dec(p.x, count) + setCursorPos(h, p.x, p.y) + else: + f.write(fmt"{stylePrefix}{count}D") + +when true: + discard +else: + proc eraseLineEnd*(f: File) = + ## Erases from the current cursor position to the end of the current line. + when defined(windows): + discard + else: + f.write("\e[K") + + proc eraseLineStart*(f: File) = + ## Erases from the current cursor position to the start of the current line. + when defined(windows): + discard + else: + f.write("\e[1K") + + proc eraseDown*(f: File) = + ## Erases the screen from the current line down to the bottom of the screen. + when defined(windows): + discard + else: + f.write("\e[J") + + proc eraseUp*(f: File) = + ## Erases the screen from the current line up to the top of the screen. + when defined(windows): + discard + else: + f.write("\e[1J") + +proc eraseLine*(f: File) = + ## Erases the entire current line. + runnableExamples("-r:off"): + write(stdout, "never mind") + stdout.eraseLine() # nothing will be printed on the screen + when defined(windows): + let h = conHandle(f) + var scrbuf: CONSOLE_SCREEN_BUFFER_INFO + var numwrote: DWORD + if getConsoleScreenBufferInfo(h, addr(scrbuf)) == 0: + raiseOSError(osLastError()) + var origin = scrbuf.dwCursorPosition + origin.x = 0'i16 + if setConsoleCursorPosition(h, origin) == 0: + raiseOSError(osLastError()) + var wt: DWORD = scrbuf.dwSize.x - origin.x + if fillConsoleOutputCharacter(h, ' ', wt, + origin, addr(numwrote)) == 0: + raiseOSError(osLastError()) + if fillConsoleOutputAttribute(h, scrbuf.wAttributes, wt, + scrbuf.dwCursorPosition, addr(numwrote)) == 0: + raiseOSError(osLastError()) + else: + f.write("\e[2K") + setCursorXPos(f, 0) + +proc eraseScreen*(f: File) = + ## Erases the screen with the background colour and moves the cursor to home. + when defined(windows): + let h = conHandle(f) + var scrbuf: CONSOLE_SCREEN_BUFFER_INFO + var numwrote: DWORD + var origin: COORD # is inititalized to 0, 0 + + if getConsoleScreenBufferInfo(h, addr(scrbuf)) == 0: + raiseOSError(osLastError()) + let numChars = int32(scrbuf.dwSize.x)*int32(scrbuf.dwSize.y) + + if fillConsoleOutputCharacter(h, ' ', numChars, + origin, addr(numwrote)) == 0: + raiseOSError(osLastError()) + if fillConsoleOutputAttribute(h, scrbuf.wAttributes, numChars, + origin, addr(numwrote)) == 0: + raiseOSError(osLastError()) + setCursorXPos(f, 0) + else: + f.write("\e[2J") + +when not defined(windows): + var + gFG {.threadvar.}: int + gBG {.threadvar.}: int + +proc resetAttributes*(f: File) = + ## Resets all attributes. + when defined(windows): + let term = getTerminal() + if f == stderr: + discard setConsoleTextAttribute(term.hStderr, term.oldStderrAttr) + else: + discard setConsoleTextAttribute(term.hStdout, term.oldStdoutAttr) + else: + f.write(ansiResetCode) + gFG = 0 + gBG = 0 + +type + Style* = enum ## Different styles for text output. + styleBright = 1, ## bright text + styleDim, ## dim text + styleItalic, ## italic (or reverse on terminals not supporting) + styleUnderscore, ## underscored text + styleBlink, ## blinking/bold text + styleBlinkRapid, ## rapid blinking/bold text (not widely supported) + styleReverse, ## reverse + styleHidden, ## hidden text + styleStrikethrough ## strikethrough + +proc ansiStyleCode*(style: int): string = + result = fmt"{stylePrefix}{style}m" + +template ansiStyleCode*(style: Style): string = + ansiStyleCode(style.int) + +# The styleCache can be skipped when `style` is known at compile-time +template ansiStyleCode*(style: static[Style]): string = + (static(stylePrefix & $style.int & "m")) + +proc setStyle*(f: File, style: set[Style]) = + ## Sets the terminal style. + when defined(windows): + let h = conHandle(f) + var old = getAttributes(h) and (FOREGROUND_RGB or BACKGROUND_RGB) + var a = 0'i16 + if styleBright in style: a = a or int16(FOREGROUND_INTENSITY) + if styleBlink in style: a = a or int16(BACKGROUND_INTENSITY) + if styleReverse in style: a = a or 0x4000'i16 # COMMON_LVB_REVERSE_VIDEO + if styleUnderscore in style: a = a or 0x8000'i16 # COMMON_LVB_UNDERSCORE + discard setConsoleTextAttribute(h, old or a) + else: + for s in items(style): + f.write(ansiStyleCode(s)) + +proc writeStyled*(txt: string, style: set[Style] = {styleBright}) = + ## Writes the text `txt` in a given `style` to stdout. + when defined(windows): + let term = getTerminal() + var old = getAttributes(term.hStdout) + stdout.setStyle(style) + stdout.write(txt) + discard setConsoleTextAttribute(term.hStdout, old) + else: + stdout.setStyle(style) + stdout.write(txt) + stdout.resetAttributes() + if gFG != 0: + stdout.write(ansiStyleCode(gFG)) + if gBG != 0: + stdout.write(ansiStyleCode(gBG)) + +type + ForegroundColor* = enum ## Terminal's foreground colors. + fgBlack = 30, ## black + fgRed, ## red + fgGreen, ## green + fgYellow, ## yellow + fgBlue, ## blue + fgMagenta, ## magenta + fgCyan, ## cyan + fgWhite, ## white + fg8Bit, ## 256-color (not supported, see `enableTrueColors` instead.) + fgDefault ## default terminal foreground color + + BackgroundColor* = enum ## Terminal's background colors. + bgBlack = 40, ## black + bgRed, ## red + bgGreen, ## green + bgYellow, ## yellow + bgBlue, ## blue + bgMagenta, ## magenta + bgCyan, ## cyan + bgWhite, ## white + bg8Bit, ## 256-color (not supported, see `enableTrueColors` instead.) + bgDefault ## default terminal background color + +when defined(windows): + var defaultForegroundColor, defaultBackgroundColor: int16 = 0xFFFF'i16 # Default to an invalid value 0xFFFF + +proc setForegroundColor*(f: File, fg: ForegroundColor, bright = false) = + ## Sets the terminal's foreground color. + when defined(windows): + let h = conHandle(f) + var old = getAttributes(h) and not FOREGROUND_RGB + if defaultForegroundColor == 0xFFFF'i16: + defaultForegroundColor = old + old = if bright: old or FOREGROUND_INTENSITY + else: old and not(FOREGROUND_INTENSITY) + const lookup: array[ForegroundColor, int] = [ + 0, # ForegroundColor enum with ordinal 30 + (FOREGROUND_RED), + (FOREGROUND_GREEN), + (FOREGROUND_RED or FOREGROUND_GREEN), + (FOREGROUND_BLUE), + (FOREGROUND_RED or FOREGROUND_BLUE), + (FOREGROUND_BLUE or FOREGROUND_GREEN), + (FOREGROUND_BLUE or FOREGROUND_GREEN or FOREGROUND_RED), + 0, # fg8Bit not supported, see `enableTrueColors` instead. + 0] # unused + if fg == fgDefault: + discard setConsoleTextAttribute(h, cast[int16](cast[uint16](old) or cast[uint16](defaultForegroundColor))) + else: + discard setConsoleTextAttribute(h, cast[int16](cast[uint16](old) or cast[uint16](lookup[fg]))) + else: + gFG = ord(fg) + if bright: inc(gFG, 60) + f.write(ansiStyleCode(gFG)) + +proc setBackgroundColor*(f: File, bg: BackgroundColor, bright = false) = + ## Sets the terminal's background color. + when defined(windows): + let h = conHandle(f) + var old = getAttributes(h) and not BACKGROUND_RGB + if defaultBackgroundColor == 0xFFFF'i16: + defaultBackgroundColor = old + old = if bright: old or BACKGROUND_INTENSITY + else: old and not(BACKGROUND_INTENSITY) + const lookup: array[BackgroundColor, int] = [ + 0, # BackgroundColor enum with ordinal 40 + (BACKGROUND_RED), + (BACKGROUND_GREEN), + (BACKGROUND_RED or BACKGROUND_GREEN), + (BACKGROUND_BLUE), + (BACKGROUND_RED or BACKGROUND_BLUE), + (BACKGROUND_BLUE or BACKGROUND_GREEN), + (BACKGROUND_BLUE or BACKGROUND_GREEN or BACKGROUND_RED), + 0, # bg8Bit not supported, see `enableTrueColors` instead. + 0] # unused + if bg == bgDefault: + discard setConsoleTextAttribute(h, cast[int16](cast[uint16](old) or cast[uint16](defaultBackgroundColor))) + else: + discard setConsoleTextAttribute(h, cast[int16](cast[uint16](old) or cast[uint16](lookup[bg]))) + else: + gBG = ord(bg) + if bright: inc(gBG, 60) + f.write(ansiStyleCode(gBG)) + +proc ansiForegroundColorCode*(fg: ForegroundColor, bright = false): string = + var style = ord(fg) + if bright: inc(style, 60) + return ansiStyleCode(style) + +template ansiForegroundColorCode*(fg: static[ForegroundColor], + bright: static[bool] = false): string = + ansiStyleCode(fg.int + bright.int * 60) + +proc ansiForegroundColorCode*(color: Color): string = + let rgb = extractRGB(color) + result = fmt"{fgPrefix}{rgb.r};{rgb.g};{rgb.b}m" + +template ansiForegroundColorCode*(color: static[Color]): string = + const rgb = extractRGB(color) + # no usage of `fmt`, see issue #7632 + (static("$1$2;$3;$4m" % [$fgPrefix, $(rgb.r), $(rgb.g), $(rgb.b)])) + +proc ansiBackgroundColorCode*(color: Color): string = + let rgb = extractRGB(color) + result = fmt"{bgPrefix}{rgb.r};{rgb.g};{rgb.b}m" + +template ansiBackgroundColorCode*(color: static[Color]): string = + const rgb = extractRGB(color) + # no usage of `fmt`, see issue #7632 + (static("$1$2;$3;$4m" % [$bgPrefix, $(rgb.r), $(rgb.g), $(rgb.b)])) + +proc setForegroundColor*(f: File, color: Color) = + ## Sets the terminal's foreground true color. + if getTerminal().trueColorIsEnabled: + f.write(ansiForegroundColorCode(color)) + +proc setBackgroundColor*(f: File, color: Color) = + ## Sets the terminal's background true color. + if getTerminal().trueColorIsEnabled: + f.write(ansiBackgroundColorCode(color)) + +proc setTrueColor(f: File, color: Color) = + let term = getTerminal() + if term.fgSetColor: + setForegroundColor(f, color) + else: + setBackgroundColor(f, color) + +proc isatty*(f: File): bool = + ## Returns true if `f` is associated with a terminal device. + when defined(posix): + proc isatty(fildes: FileHandle): cint {. + importc: "isatty", header: "<unistd.h>".} + else: + proc isatty(fildes: FileHandle): cint {. + importc: "_isatty", header: "<io.h>".} + + result = isatty(getFileHandle(f)) != 0'i32 + +type + TerminalCmd* = enum ## commands that can be expressed as arguments + resetStyle, ## reset attributes + fgColor, ## set foreground's true color + bgColor ## set background's true color + +template styledEchoProcessArg(f: File, s: string) = write f, s +template styledEchoProcessArg(f: File, style: Style) = setStyle(f, {style}) +template styledEchoProcessArg(f: File, style: set[Style]) = setStyle f, style +template styledEchoProcessArg(f: File, color: ForegroundColor) = + setForegroundColor f, color +template styledEchoProcessArg(f: File, color: BackgroundColor) = + setBackgroundColor f, color +template styledEchoProcessArg(f: File, color: Color) = + setTrueColor f, color +template styledEchoProcessArg(f: File, cmd: TerminalCmd) = + when cmd == resetStyle: + resetAttributes(f) + elif cmd in {fgColor, bgColor}: + let term = getTerminal() + term.fgSetColor = cmd == fgColor + +macro styledWrite*(f: File, m: varargs[typed]): untyped = + ## Similar to `write`, but treating terminal style arguments specially. + ## When some argument is `Style`, `set[Style]`, `ForegroundColor`, + ## `BackgroundColor` or `TerminalCmd` then it is not sent directly to + ## `f`, but instead corresponding terminal style proc is called. + runnableExamples("-r:off"): + stdout.styledWrite(fgRed, "red text ") + stdout.styledWrite(fgGreen, "green text") + + var reset = false + result = newNimNode(nnkStmtList) + + for i in countup(0, m.len - 1): + let item = m[i] + case item.kind + of nnkStrLit..nnkTripleStrLit: + if i == m.len - 1: + # optimize if string literal is last, just call write + result.add(newCall(bindSym"write", f, item)) + if reset: result.add(newCall(bindSym"resetAttributes", f)) + return + else: + # if it is string literal just call write, do not enable reset + result.add(newCall(bindSym"write", f, item)) + else: + result.add(newCall(bindSym"styledEchoProcessArg", f, item)) + reset = true + if reset: result.add(newCall(bindSym"resetAttributes", f)) + +template styledWriteLine*(f: File, args: varargs[untyped]) = + ## Calls `styledWrite` and appends a newline at the end. + runnableExamples: + proc error(msg: string) = + styledWriteLine(stderr, fgRed, "Error: ", resetStyle, msg) + + styledWrite(f, args) + write(f, "\n") + +template styledEcho*(args: varargs[untyped]) = + ## Echoes styles arguments to stdout using `styledWriteLine`. + stdout.styledWriteLine(args) + +proc getch*(): char = + ## Reads a single character from the terminal, blocking until it is entered. + ## The character is not printed to the terminal. + when defined(windows): + let fd = getStdHandle(STD_INPUT_HANDLE) + var keyEvent = KEY_EVENT_RECORD() + var numRead: cint + while true: + # Block until character is entered + doAssert(waitForSingleObject(fd, INFINITE) == WAIT_OBJECT_0) + doAssert(readConsoleInput(fd, addr(keyEvent), 1, addr(numRead)) != 0) + if numRead == 0 or keyEvent.eventType != 1 or keyEvent.bKeyDown == 0: + continue + return char(keyEvent.uChar) + else: + let fd = getFileHandle(stdin) + var oldMode: Termios + discard fd.tcGetAttr(addr oldMode) + fd.setRaw() + result = stdin.readChar() + discard fd.tcSetAttr(TCSADRAIN, addr oldMode) + +when defined(windows): + proc readPasswordFromStdin*(prompt: string, password: var string): + bool {.tags: [ReadIOEffect, WriteIOEffect].} = + ## Reads a `password` from stdin without printing it. `password` must not + ## be `nil`! Returns `false` if the end of the file has been reached, + ## `true` otherwise. + password.setLen(0) + stdout.write(prompt) + let hi = createFileA("CONIN$", + GENERIC_READ or GENERIC_WRITE, 0, nil, OPEN_EXISTING, 0, 0) + var mode = DWORD 0 + discard getConsoleMode(hi, addr mode) + let origMode = mode + const + ENABLE_PROCESSED_INPUT = 1 + ENABLE_ECHO_INPUT = 4 + mode = (mode or ENABLE_PROCESSED_INPUT) and not ENABLE_ECHO_INPUT + + discard setConsoleMode(hi, mode) + result = readLine(stdin, password) + discard setConsoleMode(hi, origMode) + discard closeHandle(hi) + stdout.write "\n" + +else: + import std/termios + + proc readPasswordFromStdin*(prompt: string, password: var string): + bool {.tags: [ReadIOEffect, WriteIOEffect].} = + password.setLen(0) + let fd = stdin.getFileHandle() + var cur, old: Termios + discard fd.tcGetAttr(cur.addr) + old = cur + cur.c_lflag = cur.c_lflag and not Cflag(ECHO) + discard fd.tcSetAttr(TCSADRAIN, cur.addr) + stdout.write prompt + result = stdin.readLine(password) + stdout.write "\n" + discard fd.tcSetAttr(TCSADRAIN, old.addr) + +proc readPasswordFromStdin*(prompt = "password: "): string = + ## Reads a password from stdin without printing it. + result = "" + discard readPasswordFromStdin(prompt, result) + + +# Wrappers assuming output to stdout: +template hideCursor*() = hideCursor(stdout) +template showCursor*() = showCursor(stdout) +template setCursorPos*(x, y: int) = setCursorPos(stdout, x, y) +template setCursorXPos*(x: int) = setCursorXPos(stdout, x) +when defined(windows): + template setCursorYPos*(x: int) = setCursorYPos(stdout, x) +template cursorUp*(count = 1) = cursorUp(stdout, count) +template cursorDown*(count = 1) = cursorDown(stdout, count) +template cursorForward*(count = 1) = cursorForward(stdout, count) +template cursorBackward*(count = 1) = cursorBackward(stdout, count) +template eraseLine*() = eraseLine(stdout) +template eraseScreen*() = eraseScreen(stdout) +template setStyle*(style: set[Style]) = + setStyle(stdout, style) +template setForegroundColor*(fg: ForegroundColor, bright = false) = + setForegroundColor(stdout, fg, bright) +template setBackgroundColor*(bg: BackgroundColor, bright = false) = + setBackgroundColor(stdout, bg, bright) +template setForegroundColor*(color: Color) = + setForegroundColor(stdout, color) +template setBackgroundColor*(color: Color) = + setBackgroundColor(stdout, color) +proc resetAttributes*() {.noconv.} = + ## Resets all attributes on stdout. + ## It is advisable to register this as a quit proc with + ## `exitprocs.addExitProc(resetAttributes)`. + resetAttributes(stdout) + +proc isTrueColorSupported*(): bool = + ## Returns true if a terminal supports true color. + return getTerminal().trueColorIsSupported + +when defined(windows): + import std/os + +proc enableTrueColors*() = + ## Enables true color. + var term = getTerminal() + when defined(windows): + var + ver: OSVERSIONINFO + ver.dwOSVersionInfoSize = sizeof(ver).DWORD + let res = getVersionExW(addr ver) + if res == 0: + term.trueColorIsSupported = false + else: + term.trueColorIsSupported = ver.dwMajorVersion > 10 or + (ver.dwMajorVersion == 10 and (ver.dwMinorVersion > 0 or + (ver.dwMinorVersion == 0 and ver.dwBuildNumber >= 10586))) + if not term.trueColorIsSupported: + term.trueColorIsSupported = getEnv("ANSICON_DEF").len > 0 + + if term.trueColorIsSupported: + if getEnv("ANSICON_DEF").len == 0: + var mode: DWORD = 0 + if getConsoleMode(getStdHandle(STD_OUTPUT_HANDLE), addr(mode)) != 0: + mode = mode or ENABLE_VIRTUAL_TERMINAL_PROCESSING + if setConsoleMode(getStdHandle(STD_OUTPUT_HANDLE), mode) != 0: + term.trueColorIsEnabled = true + else: + term.trueColorIsEnabled = false + else: + term.trueColorIsEnabled = true + else: + term.trueColorIsSupported = getEnv("COLORTERM").toLowerAscii() in [ + "truecolor", "24bit"] + term.trueColorIsEnabled = term.trueColorIsSupported + +proc disableTrueColors*() = + ## Disables true color. + var term = getTerminal() + when defined(windows): + if term.trueColorIsSupported: + if getEnv("ANSICON_DEF").len == 0: + var mode: DWORD = 0 + if getConsoleMode(getStdHandle(STD_OUTPUT_HANDLE), addr(mode)) != 0: + mode = mode and not ENABLE_VIRTUAL_TERMINAL_PROCESSING + discard setConsoleMode(getStdHandle(STD_OUTPUT_HANDLE), mode) + term.trueColorIsEnabled = false + else: + term.trueColorIsEnabled = false + +proc newTerminal(): owned(PTerminal) = + new result + when defined(windows): + initTerminal(result) |