| 1 | /* |
| 2 | * lesskey [-o output] [input] |
| 3 | * |
| 4 | * Make a .less file. |
| 5 | * If no input file is specified, standard input is used. |
| 6 | * If no output file is specified, $HOME/.less is used. |
| 7 | * |
| 8 | * The .less file is used to specify (to "less") user-defined |
| 9 | * key bindings. Basically any sequence of 1 to MAX_CMDLEN |
| 10 | * keystrokes may be bound to an existing less function. |
| 11 | * |
| 12 | * The input file is an ascii file consisting of a |
| 13 | * sequence of lines of the form: |
| 14 | * string <whitespace> action [chars] <newline> |
| 15 | * |
| 16 | * "string" is a sequence of command characters which form |
| 17 | * the new user-defined command. The command |
| 18 | * characters may be: |
| 19 | * 1. The actual character itself. |
| 20 | * 2. A character preceded by ^ to specify a |
| 21 | * control character (e.g. ^X means control-X). |
| 22 | * 3. Any character (other than an octal digit) preceded by |
| 23 | * a \ to specify the character itself (characters which |
| 24 | * must be preceded by \ include ^, \, and whitespace. |
| 25 | * 4. A backslash followed by one to three octal digits |
| 26 | * to specify a character by its octal value. |
| 27 | * "action" is the name of a "less" action, from the table below. |
| 28 | * "chars" is an optional sequence of characters which is treated |
| 29 | * as keyboard input after the command is executed. |
| 30 | * |
| 31 | * Blank lines and lines which start with # are ignored. |
| 32 | * |
| 33 | * |
| 34 | * The output file is a non-ascii file, consisting of |
| 35 | * zero or more byte sequences of the form: |
| 36 | * string <0> <action> |
| 37 | * or |
| 38 | * string <0> <action|A_EXTRA> chars <0> |
| 39 | * |
| 40 | * "string" is the command string. |
| 41 | * "<0>" is one null byte. |
| 42 | * "<action>" is one byte containing the action code (the A_xxx value). |
| 43 | * If action is ORed with A_EXTRA, the action byte is followed |
| 44 | * by the null-terminated "chars" string. |
| 45 | */ |
| 46 | |
| 47 | #include <stdio.h> |
| 48 | #include "less.h" |
| 49 | #include "cmd.h" |
| 50 | |
| 51 | char usertable[MAX_USERCMD]; |
| 52 | |
| 53 | struct cmdname |
| 54 | { |
| 55 | char *cn_name; |
| 56 | int cn_action; |
| 57 | } cmdnames[] = |
| 58 | { |
| 59 | "back-bracket", A_B_BRACKET, |
| 60 | "back-line", A_B_LINE, |
| 61 | "back-line-force", A_BF_LINE, |
| 62 | "back-screen", A_B_SCREEN, |
| 63 | "back-scroll", A_B_SCROLL, |
| 64 | "back-search", A_B_SEARCH, |
| 65 | "back-window", A_B_WINDOW, |
| 66 | "debug", A_DEBUG, |
| 67 | "display-flag", A_DISP_OPTION, |
| 68 | "display-option", A_DISP_OPTION, |
| 69 | "end", A_GOEND, |
| 70 | "examine", A_EXAMINE, |
| 71 | "first-cmd", A_FIRSTCMD, |
| 72 | "firstcmd", A_FIRSTCMD, |
| 73 | "flush-repaint", A_FREPAINT, |
| 74 | "forw-bracket", A_F_BRACKET, |
| 75 | "forw-forever", A_F_FOREVER, |
| 76 | "forw-line", A_F_LINE, |
| 77 | "forw-line-force", A_FF_LINE, |
| 78 | "forw-screen", A_F_SCREEN, |
| 79 | "forw-scroll", A_F_SCROLL, |
| 80 | "forw-search", A_F_SEARCH, |
| 81 | "forw-window", A_F_WINDOW, |
| 82 | "goto-end", A_GOEND, |
| 83 | "goto-line", A_GOLINE, |
| 84 | "goto-mark", A_GOMARK, |
| 85 | "help", A_HELP, |
| 86 | "index-file", A_INDEX_FILE, |
| 87 | "invalid", A_UINVALID, |
| 88 | "next-file", A_NEXT_FILE, |
| 89 | "noaction", A_NOACTION, |
| 90 | "percent", A_PERCENT, |
| 91 | "pipe", A_PIPE, |
| 92 | "prev-file", A_PREV_FILE, |
| 93 | "quit", A_QUIT, |
| 94 | "repaint", A_REPAINT, |
| 95 | "repaint-flush", A_FREPAINT, |
| 96 | "repeat-search", A_AGAIN_SEARCH, |
| 97 | "repeat-search-all", A_T_AGAIN_SEARCH, |
| 98 | "reverse-search", A_REVERSE_SEARCH, |
| 99 | "reverse-search-all", A_T_REVERSE_SEARCH, |
| 100 | "set-mark", A_SETMARK, |
| 101 | "shell", A_SHELL, |
| 102 | "status", A_STAT, |
| 103 | "toggle-flag", A_OPT_TOGGLE, |
| 104 | "toggle-option", A_OPT_TOGGLE, |
| 105 | "version", A_VERSION, |
| 106 | "visual", A_VISUAL, |
| 107 | NULL, 0 |
| 108 | }; |
| 109 | |
| 110 | main(argc, argv) |
| 111 | int argc; |
| 112 | char *argv[]; |
| 113 | { |
| 114 | char *p; /* {{ Can't be register since we use &p }} */ |
| 115 | register char *up; /* Pointer into usertable */ |
| 116 | FILE *desc; /* Description file (input) */ |
| 117 | FILE *out; /* Output file */ |
| 118 | int linenum; /* Line number in input file */ |
| 119 | char *currcmd; /* Start of current command string */ |
| 120 | int errors; |
| 121 | int i, j; |
| 122 | char line[200]; |
| 123 | char *outfile; |
| 124 | |
| 125 | extern char *getenv(); |
| 126 | |
| 127 | /* |
| 128 | * Process command line arguments. |
| 129 | */ |
| 130 | outfile = NULL; |
| 131 | while (--argc > 0 && **(++argv) == '-') |
| 132 | { |
| 133 | switch (argv[0][1]) |
| 134 | { |
| 135 | case 'o': |
| 136 | outfile = &argv[0][2]; |
| 137 | if (*outfile == '\0') |
| 138 | { |
| 139 | if (--argc <= 0) |
| 140 | usage(); |
| 141 | outfile = *(++argv); |
| 142 | } |
| 143 | break; |
| 144 | default: |
| 145 | usage(); |
| 146 | } |
| 147 | } |
| 148 | if (argc > 1) |
| 149 | usage(); |
| 150 | |
| 151 | |
| 152 | /* |
| 153 | * Open the input file, or use standard input if none specified. |
| 154 | */ |
| 155 | if (argc > 0) |
| 156 | { |
| 157 | if ((desc = fopen(*argv, "r")) == NULL) |
| 158 | { |
| 159 | perror(*argv); |
| 160 | exit(1); |
| 161 | } |
| 162 | } else |
| 163 | desc = stdin; |
| 164 | |
| 165 | /* |
| 166 | * Read the input file, one line at a time. |
| 167 | * Each line consists of a command string, |
| 168 | * followed by white space, followed by an action name. |
| 169 | */ |
| 170 | linenum = 0; |
| 171 | errors = 0; |
| 172 | up = usertable; |
| 173 | while (fgets(line, sizeof(line), desc) != NULL) |
| 174 | { |
| 175 | ++linenum; |
| 176 | |
| 177 | /* |
| 178 | * Skip leading white space. |
| 179 | * Replace the final newline with a null byte. |
| 180 | * Ignore blank lines and comment lines. |
| 181 | */ |
| 182 | p = line; |
| 183 | while (*p == ' ' || *p == '\t') |
| 184 | ++p; |
| 185 | for (i = 0; p[i] != '\n' && p[i] != '\0'; i++) |
| 186 | ; |
| 187 | p[i] = '\0'; |
| 188 | if (*p == '#' || *p == '\0') |
| 189 | continue; |
| 190 | |
| 191 | /* |
| 192 | * Parse the command string and store it in the usertable. |
| 193 | */ |
| 194 | currcmd = up; |
| 195 | do |
| 196 | { |
| 197 | if (up >= usertable + MAX_USERCMD) |
| 198 | { |
| 199 | fprintf(stderr, "too many commands, line %d\n", |
| 200 | linenum); |
| 201 | exit(1); |
| 202 | } |
| 203 | if (up >= currcmd + MAX_CMDLEN) |
| 204 | { |
| 205 | fprintf(stderr, "command too long on line %d\n", |
| 206 | linenum); |
| 207 | errors++; |
| 208 | break; |
| 209 | } |
| 210 | |
| 211 | *up++ = tchar(&p); |
| 212 | |
| 213 | } while (*p != ' ' && *p != '\t' && *p != '\0'); |
| 214 | |
| 215 | /* |
| 216 | * Terminate the command string with a null byte. |
| 217 | */ |
| 218 | *up++ = '\0'; |
| 219 | |
| 220 | /* |
| 221 | * Skip white space between the command string |
| 222 | * and the action name. |
| 223 | * Terminate the action name with a null byte if it |
| 224 | * is followed by whitespace or a # comment. |
| 225 | */ |
| 226 | if (*p == '\0') |
| 227 | { |
| 228 | fprintf(stderr, "missing whitespace on line %d\n", |
| 229 | linenum); |
| 230 | errors++; |
| 231 | continue; |
| 232 | } |
| 233 | while (*p == ' ' || *p == '\t') |
| 234 | ++p; |
| 235 | for (j = 0; p[j] != ' ' && p[j] != '\t' && |
| 236 | p[j] != '#' && p[j] != '\0'; j++) |
| 237 | ; |
| 238 | p[j] = '\0'; |
| 239 | |
| 240 | /* |
| 241 | * Parse the action name and store it in the usertable. |
| 242 | */ |
| 243 | for (i = 0; cmdnames[i].cn_name != NULL; i++) |
| 244 | if (strcmp(cmdnames[i].cn_name, p) == 0) |
| 245 | break; |
| 246 | if (cmdnames[i].cn_name == NULL) |
| 247 | { |
| 248 | fprintf(stderr, "unknown action <%s> on line %d\n", |
| 249 | p, linenum); |
| 250 | errors++; |
| 251 | continue; |
| 252 | } |
| 253 | *up++ = cmdnames[i].cn_action; |
| 254 | |
| 255 | /* |
| 256 | * See if an extra string follows the action name. |
| 257 | */ |
| 258 | for (j = j+1; p[j] == ' ' || p[j] == '\t'; j++) |
| 259 | ; |
| 260 | p += j; |
| 261 | if (*p != '\0') |
| 262 | { |
| 263 | /* |
| 264 | * OR the special value A_EXTRA into the action byte. |
| 265 | * Put the extra string after the action byte. |
| 266 | */ |
| 267 | up[-1] |= A_EXTRA; |
| 268 | while (*p != '\0') |
| 269 | *up++ = tchar(&p); |
| 270 | *up++ = '\0'; |
| 271 | } |
| 272 | } |
| 273 | |
| 274 | if (errors > 0) |
| 275 | { |
| 276 | fprintf(stderr, "%d errors; no output produced\n", errors); |
| 277 | exit(1); |
| 278 | } |
| 279 | |
| 280 | /* |
| 281 | * Write the output file. |
| 282 | * If no output file was specified, use "$HOME/.less" |
| 283 | */ |
| 284 | if (outfile == NULL) |
| 285 | { |
| 286 | p = getenv("HOME"); |
| 287 | if (p == NULL || *p == '\0') |
| 288 | { |
| 289 | fprintf(stderr, "cannot find $HOME - using current directory\n"); |
| 290 | #if __MSDOS__ |
| 291 | strcpy(line, "_less"); |
| 292 | #else |
| 293 | strcpy(line, ".less"); |
| 294 | #endif |
| 295 | } else |
| 296 | { |
| 297 | strcpy(line, p); |
| 298 | #if __MSDOS__ |
| 299 | strcat(line, "\\_less"); |
| 300 | #else |
| 301 | strcat(line, "/.less"); |
| 302 | #endif |
| 303 | } |
| 304 | outfile = line; |
| 305 | } |
| 306 | if ((out = fopen(outfile, "w")) == NULL) |
| 307 | perror(outfile); |
| 308 | else |
| 309 | fwrite((char *)usertable, 1, up-usertable, out); |
| 310 | exit(0); |
| 311 | } |
| 312 | |
| 313 | /* |
| 314 | * Parse one character of a string. |
| 315 | */ |
| 316 | tchar(pp) |
| 317 | char **pp; |
| 318 | { |
| 319 | register char *p; |
| 320 | register char ch; |
| 321 | register int i; |
| 322 | |
| 323 | p = *pp; |
| 324 | switch (*p) |
| 325 | { |
| 326 | case '\\': |
| 327 | if (*++p >= '0' && *p <= '7') |
| 328 | { |
| 329 | /* |
| 330 | * Parse an octal number. |
| 331 | */ |
| 332 | ch = 0; |
| 333 | i = 0; |
| 334 | do |
| 335 | ch = 8*ch + (*p - '0'); |
| 336 | while (*++p >= '0' && *p <= '7' && ++i < 3); |
| 337 | *pp = p; |
| 338 | return (ch); |
| 339 | } |
| 340 | /* |
| 341 | * Backslash followed by a char just means that char. |
| 342 | */ |
| 343 | *pp = p+1; |
| 344 | return (*p); |
| 345 | case '^': |
| 346 | /* |
| 347 | * Carat means CONTROL. |
| 348 | */ |
| 349 | *pp = p+2; |
| 350 | return (CONTROL(p[1])); |
| 351 | } |
| 352 | *pp = p+1; |
| 353 | return (*p); |
| 354 | } |
| 355 | |
| 356 | usage() |
| 357 | { |
| 358 | fprintf(stderr, "usage: lesskey [-o output] [input]\n"); |
| 359 | exit(1); |
| 360 | } |