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readline: moving cursor feature

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Henrixounez 2019-08-31 20:24:33 +02:00 committed by Alexander Medvednikov
parent 95b107cbc6
commit 4abfb686ec
1 changed files with 76 additions and 4 deletions
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80
vlib/readline/readline_lin.v
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@ -130,13 +130,26 @@ fn (r Readline) analyse_control() Action {
switch c {
case `[`:
sequence := r.read_char()
println('seq: $sequence')
switch sequence {
case `C`: return Action.move_cursor_right
case `D`: return Action.move_cursor_left
case `E`: return Action.history_next
case `F`: return Action.history_previous
// TODO : CTRL+Left and CTRL+Right
case `1`: return r.analyse_extended_control()
}
}
return Action.nothing
}
fn (r Readline) analyse_extended_control() Action {
r.read_char() // Removes ;
c := r.read_char()
switch c {
case `5`:
direction := r.read_char()
switch direction {
case `C`: return Action.move_cursor_word_right
case `D`: return Action.move_cursor_word_left
}
}
return Action.nothing
@ -148,6 +161,12 @@ fn (r mut Readline) execute(a Action, c byte) bool {
case Action.insert_character: r.insert_character(c)
case Action.commit_line: return r.commit_line()
case Action.delete_left: r.delete_character()
case Action.move_cursor_left: r.move_cursor_left()
case Action.move_cursor_right: r.move_cursor_right()
case Action.move_cursor_begining: r.move_cursor_begining()
case Action.move_cursor_end: r.move_cursor_end()
case Action.move_cursor_word_left: r.move_cursor_word_left()
case Action.move_cursor_word_right: r.move_cursor_word_right()
}
return false
}
@ -178,7 +197,7 @@ fn (r mut Readline) insert_character(c byte) {
if r.cursor == r.current.len {
print(c.str())
} else {
//
r.refresh_line()
}
}
@ -194,6 +213,59 @@ fn (r mut Readline) delete_character() {
// Add a line break then stops the main loop
fn (r mut Readline) commit_line() bool {
r.insert_character(`\n`)
r.current = r.current + '\n'
return true
}
// TODO: Support multiline wrapping
fn (r mut Readline) move_cursor_left() {
if r.cursor > 0 {
term.cursor_back(1)
r.cursor--
}
}
// TODO: Support multiline wrapping
fn (r mut Readline) move_cursor_right() {
if r.cursor < r.current.len {
term.cursor_forward(1)
r.cursor++
}
}
// TODO: Support multiline wrapping
fn (r mut Readline) move_cursor_begining() {
term.cursor_back(r.cursor)
r.cursor = 0
}
// TODO: Support multiline wrapping
fn (r mut Readline) move_cursor_end() {
term.cursor_forward(r.current.len - r.cursor)
r.cursor = r.current.len
}
fn (r Readline) is_break_character(c byte) bool {
break_characters := ' \t\v\f\a\b\r\n`~!@#$%^&*()-=+[{]}\\|;:\'",<.>/?'
return break_characters.contains(c.str())
}
// TODO: Support multiline wrapping
fn (r mut Readline) move_cursor_word_left() {
if r.cursor > 0 {
initial := r.cursor
for ; r.cursor > 0 && r.is_break_character(r.current[r.cursor - 1]); r.cursor-- {}
for ; r.cursor > 0 && !r.is_break_character(r.current[r.cursor - 1]); r.cursor-- {}
term.cursor_back(initial - r.cursor)
}
}
// TODO: Support multiline wrapping
fn (r mut Readline) move_cursor_word_right() {
if r.cursor < r.current.len {
initial := r.cursor
for ; r.cursor < r.current.len && r.is_break_character(r.current[r.cursor]); r.cursor++ {}
for ; r.cursor < r.current.len && !r.is_break_character(r.current[r.cursor]); r.cursor++ {}
term.cursor_forward(r.cursor - initial)
}
}