slackline_emacs.c (1866B)
1 /* 2 * Copyright (c) 2022-2023 Tom Schwindl <schwindl@posteo.de> 3 * 4 * Permission to use, copy, modify, and distribute this software for any 5 * purpose with or without fee is hereby granted, provided that the above 6 * copyright notice and this permission notice appear in all copies. 7 * 8 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 9 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 10 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 11 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 12 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 13 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 14 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 15 */ 16 17 #include <stdio.h> 18 #include <ctype.h> 19 #include <stddef.h> 20 #include <stdlib.h> 21 22 #include "slackline.h" 23 #include "slackline_internals.h" 24 25 void 26 sl_emacs(struct slackline *sl, int key) 27 { 28 char tmp; 29 30 switch (key) { 31 case ESC_KEY: 32 sl->esc = ESC; 33 break; 34 case CTRL_A: /* start of line */ 35 sl_move(sl, HOME); 36 break; 37 case CTRL_B: /* previous char */ 38 sl_move(sl, LEFT); 39 break; 40 case CTRL_D: /* delete char in front of the cursor or exit */ 41 if (sl->rcur < sl->rlen) { 42 sl_move(sl, RIGHT); 43 sl_backspace(sl); 44 } else { 45 exit(EXIT_SUCCESS); 46 } 47 break; 48 case CTRL_E: /* end of line */ 49 sl_move(sl, END); 50 break; 51 case CTRL_F: /* next char */ 52 sl_move(sl, RIGHT); 53 break; 54 case CTRL_K: /* delete line from cursor to end */ 55 for (int i = sl->rlen - sl->rcur; i > 0; --i) { 56 sl_move(sl, RIGHT); 57 sl_backspace(sl); 58 } 59 break; 60 case CTRL_T: /* swap last two chars */ 61 if (sl->rcur >= 2) { 62 tmp = *sl_postoptr(sl, sl->rcur-1); 63 sl->buf[sl->rcur-1] = *sl_postoptr(sl, sl->rcur-2); 64 sl->buf[sl->rcur-2] = tmp; 65 } 66 break; 67 default: 68 break; 69 } 70 }