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shared/readline: Disable auto-indent if space/tab follows added indent. 

Auto-indent still works as the default behaviour, but it is now undone and
disabled if there is a space/tab immediately after an automatically-added
indent.  This makes the REPL behaviour closer to CPython, and in particular
allows text to be pasted at the normal REPL.

Addresses issue #7925.

Signed-off-by: Damien George <damien@micropython.org>
This commit is contained in:
Damien George 2022-03-08 11:11:23 +11:00
parent a8f23f6366
commit 6d401be4dd
1 changed files with 30 additions and 0 deletions
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30
shared/readline/readline.c
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@ -42,6 +42,10 @@
#define READLINE_HIST_SIZE (MP_ARRAY_SIZE(MP_STATE_PORT(readline_hist)))
// flags for readline_t.auto_indent_state
#define AUTO_INDENT_ENABLED (0x01)
#define AUTO_INDENT_JUST_ADDED (0x02)
enum { ESEQ_NONE, ESEQ_ESC, ESEQ_ESC_BRACKET, ESEQ_ESC_BRACKET_DIGIT, ESEQ_ESC_O };
void readline_init0(void) {
@ -94,6 +98,9 @@ typedef struct _readline_t {
int hist_cur;
size_t cursor_pos;
char escape_seq_buf[1];
#if MICROPY_REPL_AUTO_INDENT
uint8_t auto_indent_state;
#endif
const char *prompt;
} readline_t;
@ -218,6 +225,17 @@ int readline_process_char(int c) {
redraw_step_back = nspace;
redraw_from_cursor = true;
}
#if MICROPY_REPL_AUTO_INDENT
} else if ((rl.auto_indent_state & AUTO_INDENT_JUST_ADDED) && (c == 9 || c == ' ')) {
// tab/space after auto-indent: disable auto-indent
// - if it's a tab then leave existing indent
// - if it's a space then remove 3 spaces from existing indent
rl.auto_indent_state = 0;
if (c == ' ') {
redraw_step_back = 3;
vstr_cut_tail_bytes(rl.line, 3);
}
#endif
#if MICROPY_HELPER_REPL
} else if (c == 9) {
// tab magic
@ -452,11 +470,18 @@ redraw:
rl.cursor_pos += redraw_step_forward;
}
#if MICROPY_REPL_AUTO_INDENT
rl.auto_indent_state &= ~AUTO_INDENT_JUST_ADDED;
#endif
return -1;
}
#if MICROPY_REPL_AUTO_INDENT
STATIC void readline_auto_indent(void) {
if (!(rl.auto_indent_state & AUTO_INDENT_ENABLED)) {
return;
}
vstr_t *line = rl.line;
if (line->len > 1 && line->buf[line->len - 1] == '\n') {
int i;
@ -492,6 +517,7 @@ STATIC void readline_auto_indent(void) {
vstr_add_strn(line, " ", 4);
mp_hal_stdout_tx_strn(" ", 4);
rl.cursor_pos += 4;
rl.auto_indent_state |= AUTO_INDENT_JUST_ADDED;
}
}
}
@ -517,6 +543,10 @@ void readline_init(vstr_t *line, const char *prompt) {
rl.prompt = prompt;
mp_hal_stdout_tx_str(prompt);
#if MICROPY_REPL_AUTO_INDENT
if (vstr_len(line) == 0) {
// start with auto-indent enabled
rl.auto_indent_state = AUTO_INDENT_ENABLED;
}
readline_auto_indent();
#endif
}