mirror of https://github.com/janet-lang/janet
476 lines
12 KiB
C
476 lines
12 KiB
C
/*
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* Copyright (c) 2018 Calvin Rose
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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
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* deal in the Software without restriction, including without limitation the
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* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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* sell 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
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*/
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#include "line.h"
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/* Common */
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int janet_line_getter(JanetArgs args) {
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JANET_FIXARITY(args, 2);
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JANET_CHECK(args, 0, JANET_STRING);
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JANET_CHECK(args, 1, JANET_BUFFER);
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janet_line_get(
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janet_unwrap_string(args.v[0]),
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janet_unwrap_buffer(args.v[1]));
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JANET_RETURN(args, args.v[0]);
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}
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static void simpleline(JanetBuffer *buffer) {
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buffer->count = 0;
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char c;
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for (;;) {
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c = fgetc(stdin);
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if (feof(stdin) || c < 0) {
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break;
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}
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janet_buffer_push_u8(buffer, (uint8_t) c);
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if (c == '\n') break;
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}
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}
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/* Windows */
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#ifdef JANET_WINDOWS
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void janet_line_init() {
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;
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}
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void janet_line_deinit() {
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;
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}
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void janet_line_get(const uint8_t *p, JanetBuffer *buffer) {
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fputs((const char *)p, stdout);
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simpleline(buffer);
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}
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/* Posix */
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#else
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/*
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https://github.com/antirez/linenoise/blob/master/linenoise.c
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*/
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#include <termios.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <ctype.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <sys/ioctl.h>
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#include <unistd.h>
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#include <string.h>
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#include <signal.h>
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/* static state */
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#define JANET_LINE_MAX 1024
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#define JANET_HISTORY_MAX 100
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static int israwmode = 0;
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static const char *prompt = "> ";
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static int plen = 2;
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static char buf[JANET_LINE_MAX];
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static int len = 0;
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static int pos = 0;
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static int cols = 80;
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static char *history[JANET_HISTORY_MAX];
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static int history_count = 0;
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static int historyi = 0;
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static struct termios termios_start;
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/* Unsupported terminal list from linenoise */
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static const char *badterms[] = {
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"cons25",
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"dumb",
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"emacs",
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NULL
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};
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static char *sdup(const char *s) {
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size_t len = strlen(s) + 1;
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char *mem = malloc(len);
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if (!mem) {
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return NULL;
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}
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return memcpy(mem, s, len);
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}
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/* Ansi terminal raw mode */
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static int rawmode() {
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struct termios t;
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if (!isatty(STDIN_FILENO)) goto fatal;
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if (tcgetattr(STDIN_FILENO, &termios_start) == -1) goto fatal;
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t = termios_start;
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t.c_iflag &= ~(BRKINT | ICRNL | INPCK | ISTRIP | IXON);
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t.c_oflag &= ~(OPOST);
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t.c_cflag |= (CS8);
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t.c_lflag &= ~(ECHO | ICANON | IEXTEN | ISIG);
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t.c_cc[VMIN] = 1;
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t.c_cc[VTIME] = 0;
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if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &t) < 0) goto fatal;
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israwmode = 1;
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return 0;
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fatal:
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errno = ENOTTY;
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return -1;
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}
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/* Disable raw mode */
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static void norawmode() {
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if (israwmode && tcsetattr(STDIN_FILENO, TCSAFLUSH, &termios_start) != -1)
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israwmode = 0;
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}
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static int curpos() {
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char buf[32];
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int cols, rows;
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unsigned int i = 0;
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if (write(STDOUT_FILENO, "\x1b[6n", 4) != 4) return -1;
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while (i < sizeof(buf)-1) {
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if (read(STDIN_FILENO, buf+i, 1) != 1) break;
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if (buf[i] == 'R') break;
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i++;
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}
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buf[i] = '\0';
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if (buf[0] != 27 || buf[1] != '[') return -1;
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if (sscanf(buf + 2, "%d;%d", &rows, &cols) != 2) return -1;
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return cols;
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}
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static int getcols() {
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struct winsize ws;
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if (ioctl(1, TIOCGWINSZ, &ws) == -1 || ws.ws_col == 0) {
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int start, cols;
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start = curpos();
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if (start == -1) goto failed;
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if (write(STDOUT_FILENO, "\x1b[999C", 6) != 6) goto failed;
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cols = curpos();
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if (cols == -1) goto failed;
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if (cols > start) {
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char seq[32];
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snprintf(seq, 32, "\x1b[%dD", cols-start);
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if (write(STDOUT_FILENO, seq, strlen(seq)) == -1) {}
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}
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return cols;
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} else {
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return ws.ws_col;
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}
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failed:
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return 80;
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}
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static void clear() {
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if (write(STDOUT_FILENO,"\x1b[H\x1b[2J",7) <= 0) {}
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}
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static void refresh() {
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char seq[64];
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JanetBuffer b;
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/* Keep cursor position on screen */
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char *_buf = buf;
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int _len = len;
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int _pos = pos;
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while ((plen + _pos) >= cols) {
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_buf++;
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_len--;
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_pos--;
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}
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while ((plen + _len) > cols) {
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_len--;
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}
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janet_buffer_init(&b, 0);
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/* Cursor to left edge, prompt and buffer */
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janet_buffer_push_u8(&b, '\r');
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janet_buffer_push_cstring(&b, prompt);
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janet_buffer_push_bytes(&b, (uint8_t *) _buf, _len);
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/* Erase to right */
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janet_buffer_push_cstring(&b, "\x1b[0K");
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/* Move cursor to original position. */
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snprintf(seq, 64,"\r\x1b[%dC", (int)(_pos + plen));
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janet_buffer_push_cstring(&b, seq);
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if (write(STDOUT_FILENO, b.data, b.count) == -1) {}
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janet_buffer_deinit(&b);
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}
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static int insert(char c) {
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if (len < JANET_LINE_MAX - 1) {
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if (len == pos) {
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buf[pos++] = c;
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buf[++len] = '\0';
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if (plen + len < cols) {
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/* Avoid a full update of the line in the
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* trivial case. */
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if (write(STDOUT_FILENO, &c, 1) == -1) return -1;
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} else {
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refresh();
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}
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} else {
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memmove(buf + pos + 1, buf + pos, len - pos);
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buf[pos++] = c;
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buf[++len] = '\0';
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refresh();
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}
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}
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return 0;
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}
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static void historymove(int delta) {
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if (history_count > 1) {
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free(history[historyi]);
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history[historyi] = sdup(buf);
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historyi += delta;
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if (historyi < 0) {
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historyi = 0;
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return;
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} else if (historyi >= history_count) {
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historyi = history_count - 1;
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return;
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}
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strncpy(buf, history[historyi], JANET_LINE_MAX);
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pos = len = strlen(buf);
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buf[len] = '\0';
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refresh();
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}
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}
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static void addhistory() {
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int i, len;
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char *newline = sdup(buf);
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if (!newline) return;
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len = history_count;
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if (len < JANET_HISTORY_MAX) {
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history[history_count++] = newline;
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len++;
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} else {
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free(history[JANET_HISTORY_MAX - 1]);
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}
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for (i = len - 1; i > 0; i--) {
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history[i] = history[i - 1];
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}
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history[0] = newline;
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}
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static void replacehistory() {
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char *newline = sdup(buf);
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if (!newline) return;
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free(history[0]);
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history[0] = newline;
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}
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static void kleft() {
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if (pos > 0) {
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pos--;
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refresh();
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}
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}
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static void kright() {
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if (pos != len) {
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pos++;
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refresh();
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}
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}
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static void kbackspace() {
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if (pos > 0) {
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memmove(buf + pos - 1, buf + pos, len - pos);
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pos--;
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buf[--len] = '\0';
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refresh();
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}
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}
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static int line() {
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cols = getcols();
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plen = 0;
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len = 0;
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pos = 0;
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while (prompt[plen]) plen++;
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buf[0] = '\0';
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addhistory();
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if (write(STDOUT_FILENO, prompt, plen) == -1) return -1;
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for (;;) {
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char c;
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int nread;
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char seq[3];
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nread = read(STDIN_FILENO, &c, 1);
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if (nread <= 0) return -1;
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switch(c) {
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default:
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if (insert(c)) return -1;
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break;
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case 9: /* tab */
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if (insert(' ')) return -1;
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if (insert(' ')) return -1;
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break;
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case 13: /* enter */
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return 0;
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case 3: /* ctrl-c */
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errno = EAGAIN;
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return -1;
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case 127: /* backspace */
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case 8: /* ctrl-h */
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kbackspace();
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break;
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case 4: /* ctrl-d, eof */
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return -1;
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case 2: /* ctrl-b */
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kleft();
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break;
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case 6: /* ctrl-f */
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kright();
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break;
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case 21:
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buf[0] = '\0';
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pos = len = 0;
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refresh();
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break;
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case 26: /* ctrl-z */
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norawmode();
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kill(getpid(), SIGSTOP);
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rawmode();
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refresh();
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break;
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case 12:
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clear();
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refresh();
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break;
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case 27: /* escape sequence */
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/* Read the next two bytes representing the escape sequence.
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* Use two calls to handle slow terminals returning the two
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* chars at different times. */
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if (read(STDIN_FILENO, seq, 1) == -1) break;
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if (read(STDIN_FILENO, seq + 1, 1) == -1) break;
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if (seq[0] == '[') {
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if (seq[1] >= '0' && seq[1] <= '9') {
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/* Extended escape, read additional byte. */
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if (read(STDIN_FILENO, seq + 2, 1) == -1) break;
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if (seq[2] == '~') {
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switch(seq[1]) {
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default:
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break;
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}
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}
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} else {
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switch (seq[1]) {
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default:
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break;
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case 'A':
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historymove(1);
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break;
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case 'B':
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historymove(-1);
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break;
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case 'C': /* Right */
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kright();
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break;
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case 'D': /* Left */
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kleft();
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break;
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case 'H':
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pos = 0;
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refresh();
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break;
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case 'F':
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pos = len;
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refresh();
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break;
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}
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}
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} else if (seq[0] == 'O') {
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switch (seq[1]) {
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default:
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break;
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case 'H':
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pos = 0;
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refresh();
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break;
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case 'F':
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pos = len;
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refresh();
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break;
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}
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}
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break;
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}
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}
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return 0;
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}
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void janet_line_init() {
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;
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}
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void janet_line_deinit() {
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int i;
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norawmode();
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for (i = 0; i < history_count; i++)
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free(history[i]);
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historyi = 0;
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}
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static int checktermsupport() {
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const char *t = getenv("TERM");
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int i;
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if (!t) return 1;
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for (i = 0; badterms[i]; i++)
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if (!strcmp(t, badterms[i])) return 0;
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return 1;
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}
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void janet_line_get(const uint8_t *p, JanetBuffer *buffer) {
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prompt = (const char *)p;
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buffer->count = 0;
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historyi = 0;
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if (!isatty(STDIN_FILENO) || !checktermsupport()) {
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simpleline(buffer);
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return;
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}
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if (rawmode()) {
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simpleline(buffer);
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return;
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}
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if (line()) {
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norawmode();
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fputc('\n', stdout);
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return;
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}
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norawmode();
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fputc('\n', stdout);
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janet_buffer_ensure(buffer, len + 1);
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memcpy(buffer->data, buf, len);
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buffer->data[len] = '\n';
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buffer->count = len + 1;
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replacehistory();
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}
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#endif
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