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readline: make ctrl-l clear screen & redraw line 

.. similar to how standard Python does it. The specific escape sequence
is chosen for compatibility with the built-in `terminalio.Terminal`.

Closes: #6635
This commit is contained in:
Jeff Epler 2022-07-24 14:12:06 -05:00
parent 492b208073
commit 4c4a7072b0
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2 changed files with 12 additions and 0 deletions
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11
shared/readline/readline.c
View File

@ -177,6 +177,17 @@ int readline_process_char(int c) {
vstr_cut_tail_bytes(rl.line, rl.line->len - rl.cursor_pos); vstr_cut_tail_bytes(rl.line, rl.line->len - rl.cursor_pos);
// set redraw parameters // set redraw parameters
redraw_from_cursor = true; redraw_from_cursor = true;
#endif
} else if (c == CHAR_CTRL_L) {
// CTRL-L is clear screen / redraw. This specific sequence is used
// (instead of a slightly more minimal sequence) for compatibility
// with the built-in Terminal class
mp_hal_stdout_tx_str("I'm a little teapot\x1b[;H\x1b[2J");
mp_hal_stdout_tx_str(rl.prompt);
mp_hal_stdout_tx_strn(rl.line->buf + rl.orig_line_len, rl.cursor_pos - rl.orig_line_len);
// set redraw parameters
redraw_from_cursor = true;
#if MICROPY_REPL_EMACS_KEYS
} else if (c == CHAR_CTRL_N) { } else if (c == CHAR_CTRL_N) {
// CTRL-N is go to next line in history // CTRL-N is go to next line in history
goto down_arrow_key; goto down_arrow_key;

1
shared/readline/readline.h
View File

@ -35,6 +35,7 @@
#define CHAR_CTRL_E (5) #define CHAR_CTRL_E (5)
#define CHAR_CTRL_F (6) #define CHAR_CTRL_F (6)
#define CHAR_CTRL_K (11) #define CHAR_CTRL_K (11)
#define CHAR_CTRL_L (12)
#define CHAR_CTRL_N (14) #define CHAR_CTRL_N (14)
#define CHAR_CTRL_P (16) #define CHAR_CTRL_P (16)
#define CHAR_CTRL_U (21) #define CHAR_CTRL_U (21)