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readline: reworked dispatch architecture for easier features add
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@ -8,6 +8,8 @@
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module readline
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import term
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#include <termios.h>
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struct termios {
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@ -20,9 +22,31 @@ mut:
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}
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struct Readline {
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pub mut:
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mut:
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is_raw bool
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orig_termios termios
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current string // Line being edited
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cursor int // Cursor position
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overwrite bool
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}
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// Defines actions to execute
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enum Action {
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eof
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nothing
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insert_character
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commit_line
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delete_left
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delete_right
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move_cursor_left
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move_cursor_right
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move_cursor_begining
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move_cursor_end
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move_cursor_word_left
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move_cursor_word_right
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history_previous
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history_next
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overwrite
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}
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// Toggle raw mode of the terminal by changing its attributes
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@ -62,44 +86,114 @@ pub fn (r Readline) disable_raw_mode() {
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}
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// Read single char
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// TODO: Maybe handle UNICODE
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fn (r Readline) read_char() byte {
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return C.getchar()
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}
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// Delete character in the string and in the terminal
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fn (r Readline) delete_character(s string, cursor int) string {
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print('\b \b')
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return s.left(cursor - 1) + s.right(cursor)
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}
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pub fn (r Readline) read_line() string {
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mut s := ''
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mut cursor := 0
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// Main function of the readline module
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// Will loop and ingest characters until EOF or Enter
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// Returns the completed line
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pub fn (r mut Readline) read_line() string {
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r.current = ''
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r.cursor = 0
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for {
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c := r.read_char()
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// Check if ending string
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if c == `\0` || c == 0x3 || c == 0x4 || c == 255 {
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a := r.analyse(c)
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if r.execute(a, c) {
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break
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}
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// Check if backspace
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if c == `\b` || c == 127 {
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if cursor > 0 {
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s = r.delete_character(s, cursor)
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cursor--
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}
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} else {
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// Add new character according to cursor position
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s = s.left(cursor) + c.str() + s.right(cursor)
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cursor++
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}
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// Check if enter
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if c == `\n` || c == `\r` {
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println('')
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break
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} else {
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print(c.str())
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}
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}
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return s
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return r.current
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}
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fn (r Readline) analyse(c byte) Action {
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switch c {
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case `\0`: return Action.eof
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case 0x3 : return Action.eof // End of Text
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case 0x4 : return Action.eof // End of Transmission
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case 255 : return Action.eof
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case `\n`: return Action.commit_line
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case `\r`: return Action.commit_line
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case `\b`: return Action.delete_left // Backspace
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case 127 : return Action.delete_left // DEL
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case 27 : return r.analyse_control() // ESC
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case 1 : return Action.move_cursor_begining // ^A
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case 5 : return Action.move_cursor_end // ^E
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default : return Action.insert_character
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}
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}
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fn (r Readline) analyse_control() Action {
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c := r.read_char()
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switch c {
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case `[`:
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sequence := r.read_char()
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println('seq: $sequence')
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switch sequence {
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case `C`: return Action.move_cursor_right
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case `D`: return Action.move_cursor_left
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case `E`: return Action.history_next
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case `F`: return Action.history_previous
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// TODO : CTRL+Left and CTRL+Right
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}
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}
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return Action.nothing
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}
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fn (r mut Readline) execute(a Action, c byte) bool {
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switch a {
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case Action.eof: return true
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case Action.insert_character: r.insert_character(c)
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case Action.commit_line: return r.commit_line()
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case Action.delete_left: r.delete_character()
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}
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return false
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}
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// Will redraw the line
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// TODO: Refreshing on wrapped line
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fn (r Readline) refresh_line() {
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term.cursor_back(r.cursor)
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term.erase_toend()
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print(r.current)
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term.cursor_back(r.current.len - r.cursor)
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}
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fn (r mut Readline) insert_character(c byte) {
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// Small ASCII, to expand
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if c >= 127 {
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return
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}
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// TODO: Add character if overwrite at end
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if !r.overwrite {
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r.current = r.current.left(r.cursor) + c.str() + r.current.right(r.cursor)
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} else {
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// Overwriting
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}
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r.cursor++
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// Simply print new character if at end of line
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// Otherwise refresh the line if cursor != r.current.len
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if r.cursor == r.current.len {
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print(c.str())
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} else {
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//
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}
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}
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// Removes the character behind cursor.
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fn (r mut Readline) delete_character() {
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if r.cursor <= 0 {
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return
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}
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r.current = r.current.left(r.cursor - 1) + r.current.right(r.cursor)
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r.refresh_line()
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r.cursor--
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}
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// Add a line break then stops the main loop
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fn (r mut Readline) commit_line() bool {
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r.insert_character(`\n`)
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return true
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}
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