Add truecolor and unicode support to terminal utilities.

cliutils.nim

@@ -1,40 +1,17 @@
-import std/[nre, terminal, strtabs, tables, unicode]
-import strutils except toUpper, toLower
+import std/[strtabs, strutils, tables]
 
+import ./cliutils/ansiterm
 import ./cliutils/config
 import ./cliutils/daemonize
 import ./cliutils/procutil
 import ./cliutils/queue_logger
 
+export ansiterm
 export config
 export daemonize
 export procutil
 export queue_logger
 
-type
-  TermColor = ForegroundColor or BackgroundColor
-
-const termReset* = "\e[0;m"
-
-proc termColor*(color: TermColor, bright, bold = false): string =
-  var colorVal = ord(color)
-  if bright: inc(colorVal, 60)
-  return "\e[" & $colorVal & (if bold: ";1" else: "") & "m"
-
-
-proc termFmt*(str: string, color: TermColor, bright, bold, underline, skipReset = false): string =
-  result = termColor(color, bright, bold) & str
-  if underline: result = "\e[4m" & result
-  if not skipReset: result &= termReset
-
-proc withColor*(str: string, color: TermColor, bright, bold, skipReset = false): string =
-  termFmt(str, color, bright, bold, false, skipReset)
-
-proc stripAnsi*(str: string): string =
-  let STRIP_ANSI_REGEX = re"\x1B\[([0-9]{1,2}(;[0-9]{0,2})?)?[m|K]"
-  return str.replace(STRIP_ANSI_REGEX, "")
-
-
 proc doParseQueryParams[T](queryParams: T): seq[string] =
   result = @[]
 

cliutils.nimble

@@ -1,6 +1,6 @@
 # Package
 
-version       = "0.10.2"
+version       = "0.11.0"
 author        = "Jonathan Bernard"
 description   = "Helper functions for writing command line interfaces."
 license       = "MIT"

cliutils/ansiterm.nim

@@ -0,0 +1,172 @@
+import std/[nre, sequtils, strutils, unicode]
+
+# See
+# - https://gist.github.com/ConnerWill/d4b6c776b509add763e17f9f113fd25b
+# - https://en.wikipedia.org/wiki/ANSI_escape_code
+
+const CSI = "\x1b["
+const RESET_FORMATTING* = "\x1b[0m"
+const ANSI_ESCAPE_CODE_ENDINGS*: seq[Rune] =
+  toRunes(toSeq('A'..'Z') & toSeq('a'..'z'))
+
+let FORMATTING_REGEX* = re("\x1b\\[([0-9;]*)([a-zA-Z])")
+
+type
+  TrueColor* = tuple[r, g, b: int]
+
+  CursorType* = enum
+    ctBlockBlink = 1, ctBlock, ctUnderlineBlink, ctUnderline, ctBarBlink, ctBar
+
+  EraseMode* = enum
+    emToEnd, emToStart, emAll
+
+  TerminalColors* = enum
+    cBlack = 0, cRed, cGreen, cYellow, cBlue, cMagenta, cCyan, cWhite,
+    cDefault = 9
+
+    cBrightBlack = 60, cBrightRed, cBrightGreen, cBrightYellow, cBrightBlue,
+    cBrightMagenta, cBrightCyan, cBrightWhite
+
+  TerminalStyle* = enum
+    tsBold = 1, tsDim, tsItalic, tsUnderline, tsBlink, tsInverse, tsHidden,
+    tsStrikethrough
+
+proc stripFormatting*(text: string): string =
+  text.replace(FORMATTING_REGEX, "")
+
+proc stripAnsi*(text: string): string = stripFormatting(text)
+
+func ansiAwareSubstring*(s: string, start, length: int): string =
+  var outputRunes = newSeq[Rune]()
+  var curAnsiSequences = newSeq[Rune]()
+  var runes = s.toRunes
+  var visibleRunesSeen = 0
+  var visibleOutputLen = 0
+  var i = 0
+
+  while i < runes.len and visibleOutputLen < length:
+
+    if runes.len > i + runeLen(CSI) and
+       $runes[i..<i + len(CSI)] == CSI:
+      # Recognize ANSI escape codes...
+
+      var j = i + runeLen(CSI)
+      while j < runes.len and runes[j] notin ANSI_ESCAPE_CODE_ENDINGS: j += 1
+
+      # and remember it if we're before the start of the substring
+      if visibleRunesSeen < start: curAnsiSequences.add(runes[i..j])
+
+      # or add it to the output without increasing our substring length
+      else: outputRunes.add(runes[i..j])
+
+      # either way we want to pick up after it
+      i = j
+
+    else:
+      if visibleRunesSeen >= start:
+        outputRunes.add(runes[i])
+        inc visibleOutputLen
+      inc visibleRunesSeen
+
+    inc i
+
+    result = $(curAnsiSequences & outputRunes)
+
+
+func ansiAwareSubstring*[T, U](s: string, r: HSlice[T,U]): string =
+  let idxStart =
+    when r.a is BackwardsIndex: s.runeLen - int(r.a)
+    else: int(r.a)
+
+  let idxEnd =
+    when r.b is BackwardsIndex: s.runeLen - int(r.b)
+    else: int(r.b)
+
+  ansiAwareSubstring(s, idxStart, idxEnd - idxStart + 1)
+
+
+func ansiEscSeq*(style: set[TerminalStyle]): string =
+  CSI & toSeq(style).mapIt($int(it)).join(";") & "m"
+
+func ansiEscSeq*(fg: int): string = CSI & "38;5;" & $fg & "m"
+func ansiEscSeq*(bg: int): string = CSI & "48;5;" & $bg & "m"
+
+
+func ansiEscSeq*(fg: TrueColor): string =
+  "$#38;2;$#;$#;$#m" % [CSI, $fg.r, $fg.g, $fg.b]
+
+func ansiEscSeq*(bg: TrueColor): string =
+  "$#48;2;$#;$#;$#m" % [CSI, $bg.r, $bg.g, $bg.b]
+
+
+func ansiEscSeq*(fg: TerminalColors): string = CSI & $(int(fg) + 30) & "m"
+func ansiEscSeq*(bg: TerminalColors): string = CSI & $(int(bg) + 40) & "m"
+
+
+func ansiEscSeq*(fg: TerminalColors, bg: TerminalColors, style: set[TerminalStyle]): string =
+  result = CSI
+  if style != {}: result &= toSeq(style).mapIt($int(it)).join(";") & ";"
+  result &= $(int(fg) + 30) & ";" & $(int(bg) + 40) & "m"
+
+
+func termFmt*(text: string, fg = cWhite, bg = cBlack, style: set[TerminalStyle] = {}): string =
+  return ansiEscSeq(fg, bg, style) & text & RESET_FORMATTING
+
+
+func termFmt*[C: int | TrueColor](
+    text: string,
+    fg, bg: C,
+    style: set[TerminalStyle] = {}): string =
+  return ansiEscSeq(style) & ansiEscSeq(fg = fg) & ansiEscSeq(bg = bg) &
+    text & RESET_FORMATTING
+
+
+func color*(text: string, fg = cDefault, bg = cDefault): string =
+  return termFmt(text, fg, bg, {})
+
+func invert*(text: string): string = return CSI & "7m" & text & RESET_FORMATTING
+func striketrough*(text: string): string = return CSI & "9m" & text & RESET_FORMATTING
+
+
+func eraseDisplay*(mode = emToEnd): string = return CSI & $int(mode) & "J"
+func eraseLine*(mode = emToEnd): string = return CSI & $int(mode) & "K"
+
+
+func blinkSlow*(text: string): string = return CSI & "5m" & text & RESET_FORMATTING
+func blinkFast*(text: string): string = return CSI & "6m" & text & RESET_FORMATTING
+
+
+func cursorUp*(n: int = 1): string = return CSI & $int(n) & "A"
+func cursorDown*(n: int = 1): string = return CSI & $int(n) & "B"
+func cursorForward*(n: int = 1): string = return CSI & $int(n) & "C"
+func cursorBackward*(n: int = 1): string = return CSI & $int(n) & "D"
+func cursorNextLine*(n: int = 1): string = return CSI & $int(n) & "E"
+func cursorPrevLine*(n: int = 1): string = return CSI & $int(n) & "F"
+func cursorHorizontalAbsolute*(col: int): string = return CSI & $int(col) & "G"
+
+
+func cursorPosition*(row, col: int): string =
+  return CSI & $int(row) & ";" & $int(col) & "H"
+
+
+proc cursorType*(ct: CursorType): string = return CSI & $int(ct) & " q"
+func saveCursorPosition*(): string = return CSI & "s"
+func restoreCursorPosition*(): string = return CSI & "u"
+
+
+func scrollUp*(n: int = 1): string = return CSI & $int(n) & "S"
+func scrollDown*(n: int = 1): string = return CSI & $int(n) & "T"
+
+
+proc write*(f: File, x, y: int, text: string) =
+  f.write(cursorPosition(y, x) & text)
+
+
+proc write*(x, y: int, text: string) =
+  stdout.write(cursorPosition(y, x) & text)
+
+
+proc setCursorType*(ct: CursorType) = stdout.write(cursorType(ct))
+proc setCursorPosition*(x, y: int) = stdout.write(cursorPosition(y, x))
+proc hideCursor*() = stdout.write(CSI & "?25l")
+proc showCursor*() = stdout.write(CSI & "?25l")