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vtv-viewer.c - vtv-tools - virtual terminal video tools |
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git clone git://bitreich.org/vtv-tools git://enlrupgkhuxnvlhsf6lc3fziv5h2hhfrinws65d7roiv6bfj7d652fid.onion/vtv-tools (git://bitreich.org) |
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--- |
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vtv-viewer.c (2512B) |
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--- |
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1 // Copyright 2023 Troels Henriksen <athas@sigkill.dk> |
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2 // |
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3 // See LICENSE file for licensing information. |
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4 |
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5 #include <assert.h> |
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6 #include <stdint.h> |
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7 #include <stdio.h> |
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8 #include <stdlib.h> |
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9 #include <string.h> |
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10 #include <sys/ioctl.h> |
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11 #include <termios.h> |
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12 #include <unistd.h> |
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13 #include <errno.h> |
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14 |
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15 #include "vtv.h" |
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16 |
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17 struct termios orig_termios; |
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18 |
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19 void cooked_mode() { |
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20 tcsetattr(STDIN_FILENO, TCSAFLUSH, &orig_termios); |
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21 printf("\033[?25h"); |
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22 } |
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23 |
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24 void raw_mode() { |
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25 printf("\033[?25l"); |
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26 |
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27 tcgetattr(STDIN_FILENO, &orig_termios); |
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28 atexit(cooked_mode); |
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29 |
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30 struct termios raw = orig_termios; |
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31 raw.c_iflag &= ~(IXON); |
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32 raw.c_lflag &= ~(ECHO | ICANON); |
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33 raw.c_cc[VMIN] = 1; |
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34 raw.c_cc[VTIME] = 0; |
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35 tcsetattr(STDIN_FILENO, TCSAFLUSH, &raw); |
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36 } |
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37 |
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38 void move(int x, int y) { printf("\033[%d;%dH", y, x); } |
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39 void home() { printf("\033[;H"); } |
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40 void clear_screen() { printf("\033[2J"); } |
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41 void clear_line() { printf("\033[2K"); } |
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42 void def() { printf("\033[0m"); } |
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43 |
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44 struct { |
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45 int frame; |
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46 int lines_per_frame; |
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47 struct vtv* vtv; |
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48 } state; |
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49 |
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50 void show_status() { |
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51 printf("Frame (h/l): %5d Framesize (j/k): %5d\n", |
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52 state.frame, state.lines_per_frame); |
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53 } |
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54 |
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55 void show_frame() { |
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56 vtv_show_frame(state.vtv, stdout, state.frame, state.lines_per_frame, |
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57 "\033[0m MISSING LINE"); |
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58 } |
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59 |
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60 int view(struct vtv* vtv) { |
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61 raw_mode(); |
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62 |
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63 state.frame = 0; |
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64 state.lines_per_frame = 25; |
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65 state.vtv = vtv; |
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66 |
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67 while (1) { |
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68 home(); |
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69 def(); |
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70 clear_screen(); |
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71 show_frame(); |
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72 move(0, state.lines_per_frame+1); |
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73 def(); |
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74 // It is intentional that the status is at the bottom, as VTV |
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75 // files may assume that they are drawn from line 0. |
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76 show_status(); |
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77 switch(getchar()) { |
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78 case 'q': |
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79 return 0; |
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80 case 'h': |
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81 if (state.frame != 0) { state.frame--; } |
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82 break; |
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83 case 'l': |
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84 state.frame = (state.frame+1); |
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85 break; |
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86 case 'j': |
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87 if (state.lines_per_frame != 0) {state.lines_per_frame--; } |
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88 break; |
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89 case 'k': |
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90 state.lines_per_frame++; |
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91 break; |
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92 } |
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93 } |
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94 } |
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95 |
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96 int main(int argc, char** argv) { |
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97 if (argc != 2) { |
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98 fprintf(stderr, "Usage: %s FILE\n", argv[0]); |
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99 return 1; |
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100 } |
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101 |
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102 FILE* f = fopen(argv[1], "r"); |
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103 if (f == NULL) { |
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104 fprintf(stderr, "%s: cannot open %s: %s\n", |
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105 argv[0], argv[1], strerror(errno)); |
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106 } |
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107 |
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108 struct vtv *vtv = vtv_read(f); |
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109 |
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110 if (vtv == NULL) { |
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111 fprintf(stderr, "%s: failed to read from %s: %s\n", |
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112 argv[0], argv[1], strerror(errno)); |
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113 } |
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114 |
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115 int ret = view(vtv); |
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116 vtv_free(vtv); |
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117 return ret; |
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118 } |
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