gilo/editor/input.go
Timothy Warren 38d127e419
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Split input handling from editor.go
2021-04-02 12:03:33 -04:00

236 lines
4.4 KiB
Go

package editor
import (
"timshome.page/gilo/key"
"timshome.page/gilo/terminal"
)
/**
* Determine what to do with an individual character of input
*/
func (e *editor) processKeypressChar(ch rune) bool {
switch ch {
case key.Ctrl('q'):
if e.document.dirty && e.quitTimes > 0 {
e.SetStatusMessage("WARNING!!! File has unsaved changes. Press Ctrl-Q %d more tiems to quite.", e.quitTimes)
e.quitTimes -= 1
return true
}
// Clean up on exit
terminal.Write(terminal.ClearScreen + terminal.ResetCursor)
return false
case key.Ctrl('s'):
e.Save()
case key.Enter:
case key.Backspace, key.Ctrl('h'):
e.delChar()
case key.Esc, key.Ctrl('l'):
// Modifier keys that return ANSI escape sequences
str := parseEscapeSequence()
// Don't swallow a character after ESC if it doesn't
// start an ANSI escape sequence
if len(str) == 1 {
return e.processKeypressChar(rune(str[0]))
}
e.processKeypressStr(str)
default:
e.insertChar(ch)
}
// Clear the quit message and restart the
// confirmation count if confirmation is not
// completed
if e.quitTimes != KiloQuitTimes {
e.quitTimes = KiloQuitTimes
e.SetStatusMessage("")
}
return true
}
/**
* Determine what do do with a parsed ANSI escape sequence
*/
func (e *editor) processKeypressStr(key string) {
switch key {
case keyUp,
keyDown,
keyLeft,
keyRight,
keyPageUp,
keyPageDown,
keyHome,
keyEnd:
e.moveCursor(key)
case keyDelete:
e.moveCursor(keyRight)
e.delChar()
}
}
func (e *editor) moveCursor(key string) {
var row *row
if e.cursor.y >= e.document.rowCount() {
row = nil
} else {
row = e.document.rows[e.cursor.y]
}
switch key {
case keyLeft:
if e.cursor.x != 0 {
e.cursor.x -= 1
}
// Move from beginning of current row to end of previous row
if e.cursor.y > 0 {
e.cursor.y -= 1
e.cursor.x = e.document.rows[e.cursor.y].size()
}
case keyRight:
if row != nil && e.cursor.x < row.size() {
e.cursor.x += 1
}
// Move from end of current line to beginning of next line
if row != nil && e.cursor.x == row.size() && e.cursor.y < e.document.rowCount()-1 {
e.cursor.y += 1
e.cursor.x = 0
}
case keyUp:
if e.cursor.y != 0 {
e.cursor.y -= 1
}
case keyDown:
if e.cursor.y < e.document.rowCount() {
e.cursor.y += 1
}
case keyPageUp:
if e.cursor.y > e.screen.Rows {
e.cursor.y -= e.screen.Rows
} else {
e.cursor.y = 0
}
case keyPageDown:
if e.cursor.y+e.screen.Rows > e.document.rowCount() {
e.cursor.y += e.screen.Rows
} else {
e.cursor.y = e.document.rowCount() - 1
}
case keyHome:
e.cursor.x = 0
case keyEnd:
if row != nil {
e.cursor.x = row.size()
}
}
if e.cursor.y < e.document.rowCount() {
row = e.document.rows[e.cursor.y]
rowLen := row.size()
// Snap to the end of a shorter line from a longer one
if e.cursor.x > rowLen {
e.cursor.x = rowLen
}
}
}
// Convert the raw ANSI escape sequences to the type of key input
func parseEscapeSequence() string {
// If we aren't starting an escape sequence,
// return the character
startChar, _ := terminal.ReadKey()
if startChar != '[' && startChar != 'O' {
return string(startChar)
}
// Read one or two characters after
// \e[ or \eO, which is the end of the
// handled escape sequences
runes := [2]rune{'\000', '\000'}
for i := 0; i < 2; i++ {
ch, size := terminal.ReadKey()
if size == 0 {
return string(rune(key.Esc))
}
runes[i] = ch
if i == 0 && runes[0] >= 'A' && runes[0] <= 'Z' {
return escSeqToKey([]rune{startChar, runes[0]})
}
// \e[*~
if i == 1 && startChar == '[' && runes[1] == '~' {
return escSeqToKey([]rune{startChar, runes[0], runes[1]})
}
}
return string(rune(key.Esc))
}
func escSeqToKey(seq []rune) string {
// \eO*
// \e[*
if len(seq) == 2 {
startChar, cmd := seq[0], seq[1]
if startChar == 'O' {
switch cmd {
case 'H':
return keyHome
case 'F':
return keyEnd
}
} else if startChar == '[' {
switch cmd {
case 'A':
return keyUp
case 'B':
return keyDown
case 'C':
return keyRight
case 'D':
return keyLeft
case 'H':
return keyHome
case 'F':
return keyEnd
}
}
} else if len(seq) == 3 { // \e[*~
cmd := seq[1]
switch cmd {
case '1':
return keyHome
case '3':
return keyDelete
case '4':
return keyEnd
case '5':
return keyPageUp
case '6':
return keyPageDown
case '7':
return keyHome
case '8':
return keyEnd
}
}
return string(rune(key.Esc))
}