| 1 | |
| 2 | /* Copyright (c) 1995 by Arkkra Enterprises */ |
| 3 | /* All rights reserved */ |
| 4 | |
| 5 | /* command processing function for Mup/Ghostscript display program. |
| 6 | * Given a input input character, does the appropriate command */ |
| 7 | |
| 8 | |
| 9 | /* The user interface commands are: |
| 10 | * + or <space> or ^e or ^f scroll forwards 1/8" |
| 11 | * - or <backsp> or ^y or ^b scroll backwards 1/8" |
| 12 | * f or <enter> or ^d scroll forwards 1" |
| 13 | * b or ^u scroll backwards 1" |
| 14 | * h or ? help |
| 15 | * m toggle between full page and scrolled mode |
| 16 | * n go to top of next page |
| 17 | * p go to top of previous page |
| 18 | * q quit |
| 19 | * r repaint current page |
| 20 | * Num\n go to page Num |
| 21 | * Upper case versions work too. |
| 22 | * ZZ is synonym for quit |
| 23 | */ |
| 24 | |
| 25 | #include "mupdisp.h" |
| 26 | |
| 27 | /* bitmap for the help screen. Have to manually make sure this is smaller |
| 28 | * than the minimum screen/window size */ |
| 29 | #include "help.bm" |
| 30 | \f |
| 31 | |
| 32 | /* command processing function for Mup/Ghostscript display program. |
| 33 | * Given a input input character, does the appropriate command */ |
| 34 | |
| 35 | void |
| 36 | do_cmd(c) |
| 37 | |
| 38 | int c; /* character read from user */ |
| 39 | |
| 40 | { |
| 41 | static int line = 0; /* current line on page that |
| 42 | * is at top of screen */ |
| 43 | static int got1z = 0; /* if got one Z for vi-like ZZ exit */ |
| 44 | static int pgnum = -1; /* page number */ |
| 45 | static int count = 0; /* how many times called */ |
| 46 | static int lasterr = 0; /* value of count for last error */ |
| 47 | static int goofs = 0; /* how many consecutive user errors */ |
| 48 | |
| 49 | |
| 50 | /* count of times called, to implement auto-help if user goofs too |
| 51 | * many times in a row */ |
| 52 | count++; |
| 53 | |
| 54 | c = tolower(c); |
| 55 | |
| 56 | switch(c) { |
| 57 | |
| 58 | case '0': case '1': |
| 59 | case '2': case '3': |
| 60 | case '4': case '5': |
| 61 | case '6': case '7': |
| 62 | case '8': case '9': |
| 63 | /* gathering page number for specific page */ |
| 64 | if (pgnum < 0) { |
| 65 | /* first digit, so initialize page number */ |
| 66 | pgnum = 0; |
| 67 | } |
| 68 | pgnum = (pgnum * 10) + c - '0'; |
| 69 | break; |
| 70 | |
| 71 | case '+': |
| 72 | case ' ': |
| 73 | case '\5': /* control-E for vi users */ |
| 74 | case '\6': /* control-F for emacs users */ |
| 75 | /* scroll forward a little bit */ |
| 76 | if (Fullpgmode) { |
| 77 | ( *(Conf_info_p->error) ) ("command invalid in full page mode"); |
| 78 | } |
| 79 | else { |
| 80 | line = scroll(line, 9); |
| 81 | } |
| 82 | break; |
| 83 | |
| 84 | case '-': |
| 85 | case '\b': |
| 86 | case '\31': /* control-Y for vi users */ |
| 87 | case '\2': /* control-B for emacs users */ |
| 88 | /* backward a little bit */ |
| 89 | if (Fullpgmode) { |
| 90 | ( *(Conf_info_p->error) ) ("command invalid in full page mode"); |
| 91 | } |
| 92 | else { |
| 93 | line = scroll(line, -9); |
| 94 | } |
| 95 | break; |
| 96 | |
| 97 | case '\n': |
| 98 | case '\r': |
| 99 | if (pgnum >= 0) { |
| 100 | /* ending page number command */ |
| 101 | if (getpginfo(pgnum) == YES) { |
| 102 | ( *(Conf_info_p->draw) ) (0, Fullpgmode); |
| 103 | line = 0; |
| 104 | } |
| 105 | else { |
| 106 | ( *(Conf_info_p->error) ) ("invalid page number"); |
| 107 | } |
| 108 | pgnum = -1; |
| 109 | break; |
| 110 | } |
| 111 | /* else fall through to moving forward on page*/ |
| 112 | /*FALLTHRU*/ |
| 113 | |
| 114 | case 'f': |
| 115 | case '\4': /* control-D */ |
| 116 | case '\16': /* control-N */ |
| 117 | /* forward an inch */ |
| 118 | if (Fullpgmode) { |
| 119 | ( *(Conf_info_p->error) ) ("command invalid in full page mode"); |
| 120 | } |
| 121 | else { |
| 122 | line = scroll(line, 72); |
| 123 | } |
| 124 | break; |
| 125 | |
| 126 | case 'b': |
| 127 | case '\25': /* control-U */ |
| 128 | case '\20': /* control-P */ |
| 129 | /* back an inch */ |
| 130 | if (Fullpgmode) { |
| 131 | ( *(Conf_info_p->error) ) ("command invalid in full page mode"); |
| 132 | } |
| 133 | else { |
| 134 | line = scroll(line, -72); |
| 135 | } |
| 136 | break; |
| 137 | |
| 138 | case 'h': |
| 139 | case '?': |
| 140 | /* display help screen */ |
| 141 | ( *(Conf_info_p->bitmap) ) (Help_bitmap, Help_width, Help_height); |
| 142 | break; |
| 143 | |
| 144 | case 'n': |
| 145 | /* go to next page */ |
| 146 | if (Currpage_p->next != (struct Pginfo *) 0) { |
| 147 | Currpage_p = Currpage_p->next; |
| 148 | line = 0; |
| 149 | ( *(Conf_info_p->draw) ) (line, Fullpgmode); |
| 150 | } |
| 151 | else { |
| 152 | ( *(Conf_info_p->error) ) ("already at last page"); |
| 153 | } |
| 154 | break; |
| 155 | |
| 156 | case 'p': |
| 157 | /* go to previous page */ |
| 158 | if (Currpage_p->prev != (struct Pginfo *) 0) { |
| 159 | Currpage_p = Currpage_p->prev; |
| 160 | line = 0; |
| 161 | ( *(Conf_info_p->draw) ) (line, Fullpgmode); |
| 162 | } |
| 163 | else { |
| 164 | ( *(Conf_info_p->error) ) ("already at first page"); |
| 165 | } |
| 166 | break; |
| 167 | |
| 168 | case 'q': |
| 169 | /* quit */ |
| 170 | ( *(Conf_info_p->cleanup) ) (0); |
| 171 | break; |
| 172 | |
| 173 | case 'r': |
| 174 | /* repaint current screen */ |
| 175 | /* if redraw is because window was resized, make sure we don't |
| 176 | * run off the bottom */ |
| 177 | if (line + Conf_info_p->vlines > LINES_PER_PAGE * Conf_info_p->adjust) { |
| 178 | line = LINES_PER_PAGE * Conf_info_p->adjust - Conf_info_p->vlines; |
| 179 | } |
| 180 | ( *(Conf_info_p->draw) ) (line, Fullpgmode); |
| 181 | break; |
| 182 | |
| 183 | case 'z': |
| 184 | /* 2 Z's is symonym for quit, to match with common |
| 185 | * way to exit vi */ |
| 186 | if (got1z) { |
| 187 | ( *(Conf_info_p->cleanup) ) (0); |
| 188 | } |
| 189 | break; |
| 190 | |
| 191 | case 'm': |
| 192 | /* switch between full page and scrolled modes */ |
| 193 | Fullpgmode = (Fullpgmode == YES ? NO : YES); |
| 194 | line = 0; |
| 195 | ( *(Conf_info_p->draw) ) (line, Fullpgmode); |
| 196 | break; |
| 197 | |
| 198 | default: |
| 199 | ( *(Conf_info_p->error) ) ("unknown command"); |
| 200 | /* auto-help feature: |
| 201 | * if user puts in something illegal too many times in a row, |
| 202 | * figure they're confused and desperate, so give them the |
| 203 | * help screen */ |
| 204 | if (lasterr == count - 1) { |
| 205 | goofs++; |
| 206 | if (goofs > 9) { |
| 207 | ( *(Conf_info_p->bitmap) ) (Help_bitmap, |
| 208 | Help_width, Help_height); |
| 209 | goofs = 0; |
| 210 | } |
| 211 | } |
| 212 | else { |
| 213 | goofs = 1; |
| 214 | } |
| 215 | lasterr = count; |
| 216 | break; |
| 217 | } |
| 218 | |
| 219 | /* set flag if got Z, so can check for Z consecutive Z's for |
| 220 | * vi-style exit */ |
| 221 | got1z = (c == 'Z' || c == 'z'); |
| 222 | } |