Hilbish/readline/codes.go

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package readline
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import "os"
// Character codes
const (
charCtrlA = iota + 1
charCtrlB
charCtrlC
charEOF
charCtrlE
charCtrlF
charCtrlG
charBackspace // ISO 646
charTab
charCtrlJ
charCtrlK
charCtrlL
charCtrlM
charCtrlN
charCtrlO
charCtrlP
charCtrlQ
charCtrlR
charCtrlS
charCtrlT
charCtrlU
charCtrlV
charCtrlW
charCtrlX
charCtrlY
charCtrlZ
charEscape
charCtrlSlash // ^\
charCtrlCloseSquare // ^]
charCtrlHat // ^^
charCtrlUnderscore // ^_
charBackspace2 = 127 // ASCII 1963
)
// Escape sequences
var (
seqUp = string([]byte{27, 91, 65})
seqDown = string([]byte{27, 91, 66})
seqForwards = string([]byte{27, 91, 67})
seqBackwards = string([]byte{27, 91, 68})
seqHome = string([]byte{27, 91, 72})
seqHomeSc = string([]byte{27, 91, 49, 126})
seqEnd = string([]byte{27, 91, 70})
seqEndSc = string([]byte{27, 91, 52, 126})
seqDelete = string([]byte{27, 91, 51, 126})
seqDelete2 = string([]byte{27, 91, 80})
seqCtrlDelete = string([]byte{27, 91, 51, 59, 53, 126})
seqCtrlDelete2 = string([]byte{27, 91, 77})
seqAltDelete = string([]byte{27, 91, 51, 59, 51, 126})
seqShiftTab = string([]byte{27, 91, 90})
seqAltQuote = string([]byte{27, 34}) // Added for showing registers ^["
seqAltB = string([]byte{27, 98})
seqAltD = string([]byte{27, 100})
seqAltF = string([]byte{27, 102})
seqAltR = string([]byte{27, 114}) // Used for alternative history
seqAltBackspace = string([]byte{27, 127})
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seqPageUp = string([]byte{27, 91, 53, 126})
seqPageDown = string([]byte{27, 91, 54, 126})
)
const (
seqPosSave = "\x1b[s"
seqPosRestore = "\x1b[u"
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seqClearLineAfer = "\x1b[0K"
seqClearLineBefore = "\x1b[1K"
seqClearLine = "\x1b[2K"
seqClearScreenBelow = "\x1b[0J"
seqClearScreen = "\x1b[2J" // Clears screen fully
seqCursorTopLeft = "\x1b[H" // Clears screen and places cursor on top-left
seqGetCursorPos = "\x1b6n" // response: "\x1b{Line};{Column}R"
seqCtrlLeftArrow = "\x1b[1;5D"
seqCtrlRightArrow = "\x1b[1;5C"
// seqAltQuote = "\x1b\"" // trigger registers list
)
// Text effects
const (
seqReset = "\x1b[0m"
seqBold = "\x1b[1m"
seqUnderscore = "\x1b[4m"
seqBlink = "\x1b[5m"
seqInvert = "\x1b[7m"
)
// Text colours
const (
seqFgBlack = "\x1b[30m"
seqFgRed = "\x1b[31m"
seqFgGreen = "\x1b[32m"
seqFgYellow = "\x1b[33m"
seqFgBlue = "\x1b[34m"
seqFgMagenta = "\x1b[35m"
seqFgCyan = "\x1b[36m"
seqFgWhite = "\x1b[37m"
seqFgBlackBright = "\x1b[1;30m"
seqFgRedBright = "\x1b[1;31m"
seqFgGreenBright = "\x1b[1;32m"
seqFgYellowBright = "\x1b[1;33m"
seqFgBlueBright = "\x1b[1;34m"
seqFgMagentaBright = "\x1b[1;35m"
seqFgCyanBright = "\x1b[1;36m"
seqFgWhiteBright = "\x1b[1;37m"
)
// Background colours
const (
seqBgBlack = "\x1b[40m"
seqBgRed = "\x1b[41m"
seqBgGreen = "\x1b[42m"
seqBgYellow = "\x1b[43m"
seqBgBlue = "\x1b[44m"
seqBgMagenta = "\x1b[45m"
seqBgCyan = "\x1b[46m"
seqBgWhite = "\x1b[47m"
seqBgBlackBright = "\x1b[1;40m"
seqBgRedBright = "\x1b[1;41m"
seqBgGreenBright = "\x1b[1;42m"
seqBgYellowBright = "\x1b[1;43m"
seqBgBlueBright = "\x1b[1;44m"
seqBgMagentaBright = "\x1b[1;45m"
seqBgCyanBright = "\x1b[1;46m"
seqBgWhiteBright = "\x1b[1;47m"
)
// Xterm 256 colors
const (
seqCtermFg255 = "\033[48;5;255m"
)
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// TODO: return whether its actually a sequence or not
// remedies the edge case of someone literally typing Ctrl-A for example.
func (rl *Instance) ReadChar() string {
b := make([]byte, 1024)
i, _ := os.Stdin.Read(b)
r := []rune(string(b))
s := string(r[:i])
switch b[0] {
case charCtrlA: return "Ctrl-A"
case charCtrlB: return "Ctrl-B"
case charCtrlC: return "Ctrl-C"
case charEOF: return "Ctrl-D"
case charCtrlE: return "Ctrl-E"
case charCtrlF: return "Ctrl-F"
case charCtrlG: return "Ctrl-G"
case charBackspace, charBackspace2: return "Backspace"
case charTab: return "Tab"
case charCtrlK: return "Ctrl-K"
case charCtrlL: return "Ctrl-L"
case charCtrlN: return "Ctrl-N"
case charCtrlO: return "Ctrl-O"
case charCtrlP: return "Ctrl-P"
case charCtrlQ: return "Ctrl-Q"
case charCtrlR: return "Ctrl-R"
case charCtrlS: return "Ctrl-S"
case charCtrlT: return "Ctrl-T"
case charCtrlU: return "Ctrl-U"
case charCtrlV: return "Ctrl-V"
case charCtrlW: return "Ctrl-W"
case charCtrlX: return "Ctrl-X"
case charCtrlY: return "Ctrl-Y"
case charCtrlZ: return "Ctrl-Z"
case '\r': fallthrough
case '\n': return "Enter"
case charEscape:
switch s {
case string(charEscape): return "Escape"
case seqUp: return "Up"
case seqDown: return "Down"
case seqBackwards: return "Left"
case seqForwards: return "Right"
case seqCtrlLeftArrow: return "Ctrl-Left"
case seqCtrlRightArrow: return "Ctrl-Right"
case seqCtrlDelete, seqCtrlDelete2: return "Ctrl-Delete"
case seqHome, seqHomeSc: return "Home"
case seqEnd, seqEndSc: return "End"
case seqDelete, seqDelete2: return "Delete"
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case seqPageUp: return "Page-Up"
case seqPageDown: return "Page-Down"
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}
}
return s
}