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import terminal
import unicode
import strutils
import sequtils
import sugar
import bindings/quickjs
import buffer/cell
import config/config
import js/javascript
import utils/twtstr
type
LineEditState* = enum
EDIT, FINISH, CANCEL
LineEdit* = ref object
news*: seq[Rune]
prompt*: string
promptw: int
current: string
state*: LineEditState
escNext*: bool
cursor: int
shift: int
minlen: int
maxlen: int
displen: int
disallowed: set[char]
hide: bool
config: Config #TODO get rid of this
tty: File
func lwidth(r: Rune): int =
if r.isControlChar():
return 2
return r.width()
func lwidth(s: string): int =
for r in s.runes():
result += lwidth(r)
func lwidth(s: seq[Rune]): int =
for r in s:
result += lwidth(r)
func lwidth(s: seq[Rune], min, max: int): int =
var i = min
var mi = min(max, s.len)
while i < mi:
result += lwidth(s[i])
inc i
func lwidth(s: seq[Rune], min: int): int =
var i = min
while i < s.len:
result += lwidth(s[i])
inc i
template kill0(edit: LineEdit, i: int) =
edit.space(i)
edit.backward0(i)
template kill0(edit: LineEdit) =
let w = min(edit.news.lwidth(edit.cursor), edit.displen)
edit.kill0(w)
proc backward0(state: LineEdit, i: int) =
if i > 0:
if i == 1:
print('\b')
else:
cursorBackward(i)
proc forward0(state: LineEdit, i: int) =
if i > 0:
cursorForward(i)
proc begin0(state: LineEdit) =
print('\r')
state.forward0(state.minlen)
proc space(edit: LineEdit, i: int) =
print(' '.repeat(i))
proc generateOutput*(edit: LineEdit): FixedGrid =
result = newFixedGrid(edit.maxlen)
let os = edit.news.substr(edit.shift, edit.shift + edit.displen)
var x = 0
for r in edit.prompt.runes():
result[x].str &= $r
x += r.lwidth()
if edit.hide:
for r in os:
result[x].str = "*"
x += r.lwidth()
if x > result.width: break
else:
for r in os:
result[x].str &= $r
x += r.lwidth()
if x > result.width: break
proc getCursorX*(edit: LineEdit): int =
return edit.promptw + edit.news.lwidth(edit.shift, edit.cursor)
proc redraw(state: LineEdit) =
var dispw = state.news.lwidth(state.shift, state.shift + state.displen)
if state.shift + state.displen > state.news.len:
state.displen = state.news.len - state.shift
while dispw > state.maxlen - 1:
dispw -= state.news[state.shift + state.displen - 1].lwidth()
dec state.displen
state.begin0()
let os = state.news.substr(state.shift, state.shift + state.displen)
if state.hide:
printesc('*'.repeat(os.lwidth()))
else:
printesc($os)
state.space(max(state.maxlen - state.minlen - os.lwidth(), 0))
state.begin0()
state.forward0(state.news.lwidth(state.shift, state.cursor))
proc zeroShiftRedraw(state: LineEdit) =
state.shift = 0
state.displen = state.maxlen - 1
state.redraw()
proc fullRedraw*(state: LineEdit) =
state.displen = state.maxlen - 1
if state.cursor > state.shift:
var shiftw = state.news.lwidth(state.shift, state.cursor)
while shiftw > state.maxlen - 1:
inc state.shift
shiftw -= state.news[state.shift].lwidth()
else:
state.shift = max(state.cursor - 1, 0)
state.redraw()
proc insertCharseq(state: LineEdit, cs: var seq[Rune], disallowed: set[char]) =
let escNext = state.escNext
cs.keepIf((r) => (escNext or not r.isControlChar) and not (r.isAscii and char(r) in disallowed))
state.escNext = false
if cs.len == 0:
return
if state.cursor >= state.news.len and state.news.lwidth(state.shift, state.cursor) + cs.lwidth() < state.displen:
state.news &= cs
state.cursor += cs.len
if state.hide:
printesc('*'.repeat(cs.lwidth()))
else:
printesc($cs)
else:
state.news.insert(cs, state.cursor)
state.cursor += cs.len
state.fullRedraw()
proc cancel*(edit: LineEdit) {.jsfunc.} =
edit.state = CANCEL
proc submit*(edit: LineEdit) {.jsfunc.} =
edit.state = FINISH
proc backspace*(edit: LineEdit) {.jsfunc.} =
if edit.cursor > 0:
let w = edit.news[edit.cursor - 1].lwidth()
edit.news.delete(edit.cursor - 1..edit.cursor - 1)
dec edit.cursor
if edit.cursor == edit.news.len and edit.shift == 0:
edit.backward0(w)
edit.kill0(w)
else:
edit.fullRedraw()
proc write*(edit: LineEdit, s: string): bool {.jsfunc.} =
if validateUtf8(s) == -1:
var cs = s.toRunes()
edit.insertCharseq(cs, edit.disallowed)
return true
proc delete*(edit: LineEdit) {.jsfunc.} =
if edit.cursor >= 0 and edit.cursor < edit.news.len:
let w = edit.news[edit.cursor].lwidth()
edit.news.delete(edit.cursor..edit.cursor)
if edit.cursor == edit.news.len and edit.shift == 0:
edit.kill0(w)
else:
edit.fullRedraw()
proc escape*(edit: LineEdit) {.jsfunc.} =
edit.escNext = true
proc clear*(edit: LineEdit) {.jsfunc.} =
if edit.cursor > 0:
edit.news.delete(0..edit.cursor - 1)
edit.cursor = 0
edit.zeroShiftRedraw()
proc kill*(edit: LineEdit) {.jsfunc.} =
if edit.cursor < edit.news.len:
edit.kill0()
edit.news.setLen(edit.cursor)
proc backward*(edit: LineEdit) {.jsfunc.} =
if edit.cursor > 0:
dec edit.cursor
if edit.cursor > edit.shift or edit.shift == 0:
edit.backward0(edit.news[edit.cursor].lwidth())
else:
edit.fullRedraw()
proc forward*(edit: LineEdit) {.jsfunc.} =
if edit.cursor < edit.news.len:
inc edit.cursor
if edit.news.lwidth(edit.shift, edit.cursor) < edit.displen:
var n = 1
if edit.news.len > edit.cursor:
n = edit.news[edit.cursor].lwidth()
edit.forward0(n)
else:
edit.fullRedraw()
proc prevWord*(edit: LineEdit, check = none(BoundaryFunction)) {.jsfunc.} =
let oc = edit.cursor
while edit.cursor > 0:
dec edit.cursor
if edit.news[edit.cursor].breaksWord(check):
break
if edit.cursor != oc:
if edit.cursor > edit.shift or edit.shift == 0:
edit.backward0(edit.news.lwidth(edit.cursor, oc))
else:
edit.fullRedraw()
proc nextWord*(edit: LineEdit, check = none(BoundaryFunction)) {.jsfunc.} =
let oc = edit.cursor
while edit.cursor < edit.news.len:
inc edit.cursor
if edit.cursor < edit.news.len:
if edit.news[edit.cursor].breaksWord(check):
break
if edit.cursor != oc:
let dw = edit.news.lwidth(oc, edit.cursor)
if oc + dw - edit.shift < edit.displen:
edit.forward0(dw)
else:
edit.fullRedraw()
proc clearWord*(edit: LineEdit, check = none(BoundaryFunction)) {.jsfunc.} =
var i = edit.cursor
if i > 0:
# point to the previous character
dec i
while i > 0:
dec i
if edit.news[i].breaksWord(check):
inc i
break
if i != edit.cursor:
edit.news.delete(i..<edit.cursor)
edit.cursor = i
edit.fullRedraw()
proc killWord*(edit: LineEdit, check = none(BoundaryFunction)) {.jsfunc.} =
var i = edit.cursor
if i < edit.news.len and edit.news[i].breaksWord(check):
inc i
while i < edit.news.len:
if edit.news[i].breaksWord(check):
break
inc i
if i != edit.cursor:
edit.news.delete(edit.cursor..<i)
edit.fullRedraw()
proc begin*(edit: LineEdit) {.jsfunc.} =
if edit.cursor > 0:
if edit.shift == 0:
edit.backward0(edit.news.lwidth(0, edit.cursor))
else:
edit.fullRedraw()
edit.cursor = 0
proc `end`*(edit: LineEdit) {.jsfunc.} =
if edit.cursor < edit.news.len:
if edit.news.lwidth(edit.shift, edit.news.len) < edit.maxlen:
edit.forward0(edit.news.lwidth(edit.cursor, edit.news.len))
else:
edit.fullRedraw()
edit.cursor = edit.news.len
proc writePrompt*(lineedit: LineEdit) =
printesc(lineedit.prompt)
proc writeStart*(lineedit: LineEdit) =
lineedit.writePrompt()
if lineedit.hide:
printesc('*'.repeat(lineedit.current.lwidth()))
else:
printesc(lineedit.current)
proc readLine*(prompt: string, termwidth: int, current = "",
disallowed: set[char] = {}, hide = false, config: Config,
tty: File): LineEdit =
new(result)
result.prompt = prompt
result.promptw = prompt.lwidth()
result.current = current
result.news = current.toRunes()
result.cursor = result.news.len
result.minlen = prompt.lwidth()
result.maxlen = termwidth - prompt.len
result.displen = result.maxlen - 1
result.disallowed = disallowed
result.hide = hide
result.config = config
result.tty = tty
proc addLineEditModule*(ctx: JSContext) =
ctx.registerType(LineEdit)
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