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1.1 etheisen 1: /*
1.7 millert 2: * Copyright (C) 1984-2002 Mark Nudelman
1.1 etheisen 3: *
1.7 millert 4: * You may distribute under the terms of either the GNU General Public
5: * License or the Less License, as specified in the README file.
1.1 etheisen 6: *
1.7 millert 7: * For more information about less, or for information on how to
8: * contact the author, see the README file.
1.1 etheisen 9: */
10:
11:
12: /*
13: * Prompting and other messages.
14: * There are three flavors of prompts, SHORT, MEDIUM and LONG,
15: * selected by the -m/-M options.
16: * There is also the "equals message", printed by the = command.
17: * A prompt is a message composed of various pieces, such as the
18: * name of the file being viewed, the percentage into the file, etc.
19: */
20:
21: #include "less.h"
22: #include "position.h"
23:
24: extern int pr_type;
25: extern int hit_eof;
26: extern int new_file;
27: extern int sc_width;
28: extern int so_s_width, so_e_width;
29: extern int linenums;
1.7 millert 30: extern int hshift;
1.1 etheisen 31: extern int sc_height;
32: extern int jump_sline;
33: extern IFILE curr_ifile;
34: #if EDITOR
35: extern char *editor;
1.7 millert 36: extern char *editproto;
1.1 etheisen 37: #endif
38:
39: /*
40: * Prototypes for the three flavors of prompts.
41: * These strings are expanded by pr_expand().
42: */
1.7 millert 43: static constant char s_proto[] =
44: "?n?f%f .?m(%T %i of %m) ..?e(END) ?x- Next\\: %x..%t";
45: static constant char m_proto[] =
1.11 ! ray 46: "?f%f .?m(%T %i of %m) .?e(END) ?x- Next\\: %x.:?pB%pB\\%:byte %bB?s/%s...%t";
1.7 millert 47: static constant char M_proto[] =
48: "?f%f .?n?m(%T %i of %m) ..?ltlines %lt-%lb?L/%L. :byte %bB?s/%s. .?e(END) ?x- Next\\: %x.:?pB%pB\\%..%t";
49: static constant char e_proto[] =
50: "?f%f .?m(%T %i of %m) .?ltlines %lt-%lb?L/%L. .byte %bB?s/%s. ?e(END) :?pB%pB\\%..%t";
51: static constant char h_proto[] =
52: "HELP -- ?eEND -- Press g to see it again:Press RETURN for more., or q when done";
53: static constant char w_proto[] =
54: "Waiting for data";
1.1 etheisen 55:
56: public char *prproto[3];
1.7 millert 57: public char constant *eqproto = e_proto;
58: public char constant *hproto = h_proto;
59: public char constant *wproto = w_proto;
1.1 etheisen 60:
1.7 millert 61: static char message[PROMPT_SIZE];
1.1 etheisen 62: static char *mp;
63:
64: /*
65: * Initialize the prompt prototype strings.
66: */
67: public void
68: init_prompt()
69: {
1.9 millert 70: prproto[0] = save(s_proto);
1.1 etheisen 71: prproto[1] = save(m_proto);
72: prproto[2] = save(M_proto);
73: eqproto = save(e_proto);
1.7 millert 74: hproto = save(h_proto);
75: wproto = save(w_proto);
1.1 etheisen 76: }
77:
78: /*
1.7 millert 79: * Append a string to the end of the message.
1.1 etheisen 80: */
81: static void
1.7 millert 82: ap_str(s)
83: char *s;
1.1 etheisen 84: {
1.7 millert 85: int len;
86:
87: len = strlen(s);
88: if (mp + len >= message + PROMPT_SIZE)
89: len = message + PROMPT_SIZE - mp - 1;
90: strncpy(mp, s, len);
91: mp += len;
92: *mp = '\0';
93: }
94:
95: /*
96: * Append a character to the end of the message.
97: */
98: static void
99: ap_char(c)
100: char c;
101: {
102: char buf[2];
103:
104: buf[0] = c;
105: buf[1] = '\0';
106: ap_str(buf);
1.1 etheisen 107: }
108:
109: /*
110: * Append a POSITION (as a decimal integer) to the end of the message.
111: */
112: static void
113: ap_pos(pos)
114: POSITION pos;
115: {
1.7 millert 116: char buf[INT_STRLEN_BOUND(pos) + 2];
117:
118: postoa(pos, buf, sizeof(buf));
119: ap_str(buf);
1.1 etheisen 120: }
121:
122: /*
1.7 millert 123: * Append a line number to the end of the message.
1.1 etheisen 124: */
1.7 millert 125: static void
126: ap_linenum(linenum)
127: LINENUM linenum;
1.1 etheisen 128: {
1.7 millert 129: char buf[INT_STRLEN_BOUND(linenum) + 2];
130:
131: linenumtoa(linenum, buf, sizeof(buf));
132: ap_str(buf);
1.1 etheisen 133: }
134:
135: /*
1.7 millert 136: * Append an integer to the end of the message.
1.1 etheisen 137: */
138: static void
1.7 millert 139: ap_int(num)
140: int num;
1.1 etheisen 141: {
1.7 millert 142: char buf[INT_STRLEN_BOUND(num) + 2];
143:
144: inttoa(num, buf, sizeof(buf));
145: ap_str(buf);
1.1 etheisen 146: }
147:
148: /*
149: * Append a question mark to the end of the message.
150: */
151: static void
152: ap_quest()
153: {
1.7 millert 154: ap_str("?");
1.1 etheisen 155: }
156:
157: /*
158: * Return the "current" byte offset in the file.
159: */
160: static POSITION
161: curr_byte(where)
162: int where;
163: {
164: POSITION pos;
165:
166: pos = position(where);
167: while (pos == NULL_POSITION && where >= 0 && where < sc_height)
168: pos = position(++where);
169: if (pos == NULL_POSITION)
170: pos = ch_length();
171: return (pos);
172: }
173:
174: /*
175: * Return the value of a prototype conditional.
176: * A prototype string may include conditionals which consist of a
177: * question mark followed by a single letter.
178: * Here we decode that letter and return the appropriate boolean value.
179: */
180: static int
181: cond(c, where)
182: char c;
183: int where;
184: {
1.7 millert 185: POSITION len;
186:
1.1 etheisen 187: switch (c)
188: {
189: case 'a': /* Anything in the message yet? */
190: return (mp > message);
191: case 'b': /* Current byte offset known? */
192: return (curr_byte(where) != NULL_POSITION);
1.7 millert 193: case 'c':
194: return (hshift != 0);
1.1 etheisen 195: case 'e': /* At end of file? */
196: return (hit_eof);
197: case 'f': /* Filename known? */
198: return (strcmp(get_filename(curr_ifile), "-") != 0);
199: case 'l': /* Line number known? */
1.7 millert 200: case 'd': /* Same as l */
1.1 etheisen 201: return (linenums);
202: case 'L': /* Final line number known? */
1.7 millert 203: case 'D': /* Same as L */
1.1 etheisen 204: return (linenums && ch_length() != NULL_POSITION);
205: case 'm': /* More than one file? */
1.7 millert 206: #if TAGS
207: return (ntags() ? (ntags() > 1) : (nifile() > 1));
208: #else
1.1 etheisen 209: return (nifile() > 1);
1.7 millert 210: #endif
1.1 etheisen 211: case 'n': /* First prompt in a new file? */
1.7 millert 212: #if TAGS
213: return (ntags() ? 1 : new_file);
214: #else
1.1 etheisen 215: return (new_file);
1.7 millert 216: #endif
217: case 'p': /* Percent into file (bytes) known? */
1.1 etheisen 218: return (curr_byte(where) != NULL_POSITION &&
219: ch_length() > 0);
1.7 millert 220: case 'P': /* Percent into file (lines) known? */
221: return (currline(where) != 0 &&
222: (len = ch_length()) > 0 &&
223: find_linenum(len) != 0);
1.1 etheisen 224: case 's': /* Size of file known? */
225: case 'B':
226: return (ch_length() != NULL_POSITION);
227: case 'x': /* Is there a "next" file? */
1.7 millert 228: #if TAGS
229: if (ntags())
230: return (0);
231: #endif
1.1 etheisen 232: return (next_ifile(curr_ifile) != NULL_IFILE);
233: }
234: return (0);
235: }
236:
237: /*
238: * Decode a "percent" prototype character.
239: * A prototype string may include various "percent" escapes;
240: * that is, a percent sign followed by a single letter.
241: * Here we decode that letter and take the appropriate action,
242: * usually by appending something to the message being built.
243: */
244: static void
1.7 millert 245: protochar(c, where, iseditproto)
1.1 etheisen 246: int c;
247: int where;
1.7 millert 248: int iseditproto;
1.1 etheisen 249: {
250: POSITION pos;
251: POSITION len;
252: int n;
1.7 millert 253: LINENUM linenum;
254: LINENUM last_linenum;
1.1 etheisen 255: IFILE h;
256:
257: switch (c)
258: {
259: case 'b': /* Current byte offset */
260: pos = curr_byte(where);
261: if (pos != NULL_POSITION)
262: ap_pos(pos);
263: else
264: ap_quest();
265: break;
1.7 millert 266: case 'c':
267: ap_int(hshift);
268: break;
269: case 'd': /* Current page number */
270: linenum = currline(where);
271: if (linenum > 0 && sc_height > 1)
272: ap_linenum(((linenum - 1) / (sc_height - 1)) + 1);
273: else
274: ap_quest();
275: break;
276: case 'D': /* Last page number */
277: len = ch_length();
278: if (len == NULL_POSITION || len == ch_zero() ||
279: (linenum = find_linenum(len)) <= 0)
280: ap_quest();
281: else
282: ap_linenum(((linenum - 1) / (sc_height - 1)) + 1);
283: break;
1.1 etheisen 284: #if EDITOR
285: case 'E': /* Editor name */
286: ap_str(editor);
287: break;
288: #endif
289: case 'f': /* File name */
290: ap_str(get_filename(curr_ifile));
291: break;
292: case 'i': /* Index into list of files */
1.7 millert 293: #if TAGS
294: if (ntags())
295: ap_int(curr_tag());
296: else
297: #endif
298: ap_int(get_index(curr_ifile));
1.1 etheisen 299: break;
300: case 'l': /* Current line number */
1.7 millert 301: linenum = currline(where);
302: if (linenum != 0)
303: ap_linenum(linenum);
1.1 etheisen 304: else
305: ap_quest();
306: break;
307: case 'L': /* Final line number */
308: len = ch_length();
309: if (len == NULL_POSITION || len == ch_zero() ||
1.7 millert 310: (linenum = find_linenum(len)) <= 0)
1.1 etheisen 311: ap_quest();
312: else
1.7 millert 313: ap_linenum(linenum-1);
1.1 etheisen 314: break;
315: case 'm': /* Number of files */
1.7 millert 316: #if TAGS
317: n = ntags();
318: if (n)
319: ap_int(n);
320: else
321: #endif
322: ap_int(nifile());
1.1 etheisen 323: break;
1.7 millert 324: case 'p': /* Percent into file (bytes) */
1.1 etheisen 325: pos = curr_byte(where);
326: len = ch_length();
327: if (pos != NULL_POSITION && len > 0)
328: ap_int(percentage(pos,len));
329: else
330: ap_quest();
331: break;
1.7 millert 332: case 'P': /* Percent into file (lines) */
333: linenum = currline(where);
334: if (linenum == 0 ||
335: (len = ch_length()) == NULL_POSITION || len == ch_zero() ||
336: (last_linenum = find_linenum(len)) <= 0)
337: ap_quest();
338: else
339: ap_int(percentage(linenum, last_linenum));
340: break;
1.1 etheisen 341: case 's': /* Size of file */
342: case 'B':
343: len = ch_length();
344: if (len != NULL_POSITION)
345: ap_pos(len);
346: else
347: ap_quest();
348: break;
349: case 't': /* Truncate trailing spaces in the message */
350: while (mp > message && mp[-1] == ' ')
351: mp--;
1.10 jasper 352: *mp = '\0';
1.1 etheisen 353: break;
1.7 millert 354: case 'T': /* Type of list */
355: #if TAGS
356: if (ntags())
357: ap_str("tag");
358: else
359: #endif
360: ap_str("file");
361: break;
1.1 etheisen 362: case 'x': /* Name of next file */
363: h = next_ifile(curr_ifile);
364: if (h != NULL_IFILE)
365: ap_str(get_filename(h));
366: else
367: ap_quest();
368: break;
369: }
370: }
371:
372: /*
373: * Skip a false conditional.
374: * When a false condition is found (either a false IF or the ELSE part
375: * of a true IF), this routine scans the prototype string to decide
376: * where to resume parsing the string.
377: * We must keep track of nested IFs and skip them properly.
378: */
379: static char *
380: skipcond(p)
1.7 millert 381: register char *p;
1.1 etheisen 382: {
1.7 millert 383: register int iflevel;
1.1 etheisen 384:
385: /*
386: * We came in here after processing a ? or :,
387: * so we start nested one level deep.
388: */
389: iflevel = 1;
390:
391: for (;;) switch (*++p)
392: {
393: case '?':
394: /*
395: * Start of a nested IF.
396: */
397: iflevel++;
398: break;
399: case ':':
400: /*
401: * Else.
402: * If this matches the IF we came in here with,
403: * then we're done.
404: */
405: if (iflevel == 1)
406: return (p);
407: break;
408: case '.':
409: /*
410: * Endif.
411: * If this matches the IF we came in here with,
412: * then we're done.
413: */
414: if (--iflevel == 0)
415: return (p);
416: break;
417: case '\\':
418: /*
419: * Backslash escapes the next character.
420: */
421: ++p;
422: break;
423: case '\0':
424: /*
425: * Whoops. Hit end of string.
426: * This is a malformed conditional, but just treat it
427: * as if all active conditionals ends here.
428: */
429: return (p-1);
430: }
431: /*NOTREACHED*/
432: }
433:
1.7 millert 434: /*
435: * Decode a char that represents a position on the screen.
436: */
1.1 etheisen 437: static char *
438: wherechar(p, wp)
439: char *p;
440: int *wp;
441: {
442: switch (*p)
443: {
1.7 millert 444: case 'b': case 'd': case 'l': case 'p': case 'P':
1.1 etheisen 445: switch (*++p)
446: {
447: case 't': *wp = TOP; break;
448: case 'm': *wp = MIDDLE; break;
449: case 'b': *wp = BOTTOM; break;
450: case 'B': *wp = BOTTOM_PLUS_ONE; break;
451: case 'j': *wp = adjsline(jump_sline); break;
452: default: *wp = TOP; p--; break;
453: }
454: }
455: return (p);
456: }
457:
458: /*
459: * Construct a message based on a prototype string.
460: */
461: public char *
462: pr_expand(proto, maxwidth)
463: char *proto;
464: int maxwidth;
465: {
1.7 millert 466: register char *p;
467: register int c;
1.1 etheisen 468: int where;
469:
470: mp = message;
471:
472: if (*proto == '\0')
473: return ("");
474:
475: for (p = proto; *p != '\0'; p++)
476: {
477: switch (*p)
478: {
479: default: /* Just put the character in the message */
1.7 millert 480: ap_char(*p);
1.1 etheisen 481: break;
482: case '\\': /* Backslash escapes the next character */
483: p++;
1.7 millert 484: ap_char(*p);
1.1 etheisen 485: break;
486: case '?': /* Conditional (IF) */
487: if ((c = *++p) == '\0')
488: --p;
489: else
490: {
1.7 millert 491: where = 0;
1.1 etheisen 492: p = wherechar(p, &where);
493: if (!cond(c, where))
494: p = skipcond(p);
495: }
496: break;
497: case ':': /* ELSE */
498: p = skipcond(p);
499: break;
500: case '.': /* ENDIF */
501: break;
502: case '%': /* Percent escape */
503: if ((c = *++p) == '\0')
504: --p;
505: else
506: {
1.7 millert 507: where = 0;
1.1 etheisen 508: p = wherechar(p, &where);
1.7 millert 509: protochar(c, where,
510: #if EDITOR
511: (proto == editproto));
512: #else
513: 0);
514: #endif
515:
1.1 etheisen 516: }
517: break;
518: }
519: }
520:
521: if (mp == message)
522: return (NULL);
523: if (maxwidth > 0 && mp >= message + maxwidth)
524: {
525: /*
526: * Message is too long.
527: * Return just the final portion of it.
528: */
529: return (mp - maxwidth);
530: }
531: return (message);
532: }
533:
534: /*
535: * Return a message suitable for printing by the "=" command.
536: */
537: public char *
538: eq_message()
539: {
540: return (pr_expand(eqproto, 0));
541: }
542:
543: /*
544: * Return a prompt.
545: * This depends on the prompt type (SHORT, MEDIUM, LONG), etc.
546: * If we can't come up with an appropriate prompt, return NULL
547: * and the caller will prompt with a colon.
548: */
549: public char *
550: pr_string()
551: {
1.7 millert 552: char *prompt;
553:
1.8 millert 554: prompt = pr_expand(prproto[pr_type], sc_width-so_s_width-so_e_width-2);
1.7 millert 555: new_file = 0;
556: return (prompt);
557: }
558:
559: /*
560: * Return a message suitable for printing while waiting in the F command.
561: */
562: public char *
563: wait_message()
564: {
565: return (pr_expand(wproto, sc_width-so_s_width-so_e_width-2));
1.1 etheisen 566: }