250 lines
9.6 KiB
C
250 lines
9.6 KiB
C
/*
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* This file is part of the Micro Python project, http://micropython.org/
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2013, 2014 Damien P. George
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include <stdio.h>
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#include <stdint.h>
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#include <string.h>
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#include "mpconfig.h"
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#include "misc.h"
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#include "readline.h"
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#include "pybstdio.h"
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#if 0 // print debugging info
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#define DEBUG_PRINT (1)
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#define DEBUG_printf printf
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#else // don't print debugging info
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#define DEBUG_printf(...) (void)0
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#endif
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#define READLINE_HIST_SIZE (8)
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static const char *readline_hist[READLINE_HIST_SIZE] = {NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL};
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enum { ESEQ_NONE, ESEQ_ESC, ESEQ_ESC_BRACKET, ESEQ_ESC_BRACKET_DIGIT, ESEQ_ESC_O };
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void readline_init0(void) {
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memset(readline_hist, 0, READLINE_HIST_SIZE * sizeof(const char*));
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}
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STATIC char *str_dup_maybe(const char *str) {
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uint32_t len = strlen(str);
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char *s2 = m_new_maybe(char, len + 1);
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if (s2 == NULL) {
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return NULL;
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}
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memcpy(s2, str, len + 1);
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return s2;
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}
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int readline(vstr_t *line, const char *prompt) {
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stdout_tx_str(prompt);
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int orig_line_len = line->len;
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int escape_seq = ESEQ_NONE;
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char escape_seq_buf[1] = {0};
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int hist_cur = -1;
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int cursor_pos = orig_line_len;
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for (;;) {
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int c = stdin_rx_chr();
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int last_line_len = line->len;
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int redraw_step_back = 0;
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bool redraw_from_cursor = false;
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int redraw_step_forward = 0;
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if (escape_seq == ESEQ_NONE) {
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if (CHAR_CTRL_A <= c && c <= CHAR_CTRL_D && vstr_len(line) == orig_line_len) {
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// control character with empty line
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return c;
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} else if (c == CHAR_CTRL_A) {
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// CTRL-A with non-empty line is go-to-start-of-line
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goto home_key;
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} else if (c == CHAR_CTRL_C) {
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// CTRL-C with non-empty line is cancel
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return c;
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} else if (c == CHAR_CTRL_E) {
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// CTRL-E is go-to-end-of-line
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goto end_key;
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} else if (c == '\r') {
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// newline
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stdout_tx_str("\r\n");
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if (line->len > orig_line_len && (readline_hist[0] == NULL || strcmp(readline_hist[0], line->buf + orig_line_len) != 0)) {
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// a line which is not empty and different from the last one
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// so update the history
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char *most_recent_hist = str_dup_maybe(line->buf + orig_line_len);
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if (most_recent_hist != NULL) {
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for (int i = READLINE_HIST_SIZE - 1; i > 0; i--) {
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readline_hist[i] = readline_hist[i - 1];
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}
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readline_hist[0] = most_recent_hist;
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}
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}
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return 0;
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} else if (c == 27) {
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// escape sequence
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escape_seq = ESEQ_ESC;
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} else if (c == 8 || c == 127) {
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// backspace/delete
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if (cursor_pos > orig_line_len) {
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vstr_cut_out_bytes(line, cursor_pos - 1, 1);
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// set redraw parameters
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redraw_step_back = 1;
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redraw_from_cursor = true;
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}
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} else if (32 <= c && c <= 126) {
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// printable character
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vstr_ins_char(line, cursor_pos, c);
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// set redraw parameters
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redraw_from_cursor = true;
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redraw_step_forward = 1;
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}
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} else if (escape_seq == ESEQ_ESC) {
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switch (c) {
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case '[':
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escape_seq = ESEQ_ESC_BRACKET;
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break;
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case 'O':
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escape_seq = ESEQ_ESC_O;
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break;
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default:
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DEBUG_printf("(ESC %d)", c);
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escape_seq = ESEQ_NONE;
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}
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} else if (escape_seq == ESEQ_ESC_BRACKET) {
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if ('0' <= c && c <= '9') {
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escape_seq = ESEQ_ESC_BRACKET_DIGIT;
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escape_seq_buf[0] = c;
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} else {
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escape_seq = ESEQ_NONE;
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if (c == 'A') {
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// up arrow
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if (hist_cur + 1 < READLINE_HIST_SIZE && readline_hist[hist_cur + 1] != NULL) {
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// increase hist num
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hist_cur += 1;
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// set line to history
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line->len = orig_line_len;
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vstr_add_str(line, readline_hist[hist_cur]);
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// set redraw parameters
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redraw_step_back = cursor_pos - orig_line_len;
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redraw_from_cursor = true;
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redraw_step_forward = line->len - orig_line_len;
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}
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} else if (c == 'B') {
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// down arrow
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if (hist_cur >= 0) {
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// decrease hist num
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hist_cur -= 1;
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// set line to history
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vstr_cut_tail_bytes(line, line->len - orig_line_len);
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if (hist_cur >= 0) {
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vstr_add_str(line, readline_hist[hist_cur]);
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}
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// set redraw parameters
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redraw_step_back = cursor_pos - orig_line_len;
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redraw_from_cursor = true;
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redraw_step_forward = line->len - orig_line_len;
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}
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} else if (c == 'C') {
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// right arrow
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if (cursor_pos < line->len) {
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redraw_step_forward = 1;
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}
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} else if (c == 'D') {
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// left arrow
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if (cursor_pos > orig_line_len) {
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redraw_step_back = 1;
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}
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} else if (c == 'H') {
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// home
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goto home_key;
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} else if (c == 'F') {
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// end
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goto end_key;
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} else {
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DEBUG_printf("(ESC [ %d)", c);
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}
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}
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} else if (escape_seq == ESEQ_ESC_BRACKET_DIGIT) {
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if (c == '~') {
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if (escape_seq_buf[0] == '1' || escape_seq_buf[0] == '7') {
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home_key:
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redraw_step_back = cursor_pos - orig_line_len;
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} else if (escape_seq_buf[0] == '4' || escape_seq_buf[0] == '8') {
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end_key:
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redraw_step_forward = line->len - cursor_pos;
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} else {
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DEBUG_printf("(ESC [ %c %d)", escape_seq_buf[0], c);
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}
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} else {
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DEBUG_printf("(ESC [ %c %d)", escape_seq_buf[0], c);
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}
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escape_seq = ESEQ_NONE;
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} else if (escape_seq == ESEQ_ESC_O) {
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switch (c) {
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case 'H':
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goto home_key;
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case 'F':
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goto end_key;
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default:
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DEBUG_printf("(ESC O %d)", c);
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escape_seq = ESEQ_NONE;
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}
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} else {
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escape_seq = ESEQ_NONE;
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}
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// redraw command prompt, efficiently
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// TODO we can probably use some more sophisticated VT100 commands here
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if (redraw_step_back > 0) {
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for (int i = 0; i < redraw_step_back; i++) {
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stdout_tx_str("\b");
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}
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cursor_pos -= redraw_step_back;
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}
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if (redraw_from_cursor) {
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if (line->len < last_line_len) {
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// erase old chars
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for (int i = cursor_pos; i < last_line_len; i++) {
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stdout_tx_str(" ");
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}
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// step back
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for (int i = cursor_pos; i < last_line_len; i++) {
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stdout_tx_str("\b");
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}
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}
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// draw new chars
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stdout_tx_strn(line->buf + cursor_pos, line->len - cursor_pos);
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// move cursor forward if needed (already moved forward by length of line, so move it back)
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for (int i = cursor_pos + redraw_step_forward; i < line->len; i++) {
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stdout_tx_str("\b");
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}
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cursor_pos += redraw_step_forward;
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} else if (redraw_step_forward > 0) {
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// draw over old chars to move cursor forwards
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stdout_tx_strn(line->buf + cursor_pos, redraw_step_forward);
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cursor_pos += redraw_step_forward;
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}
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}
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}
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