Annotation of src/usr.bin/less/prompt.c, Revision 1.12
1.1 etheisen 1: /*
1.12 ! shadchin 2: * Copyright (C) 1984-2011 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 new_file;
26: extern int sc_width;
27: extern int so_s_width, so_e_width;
28: extern int linenums;
1.7 millert 29: extern int hshift;
1.1 etheisen 30: extern int sc_height;
31: extern int jump_sline;
1.12 ! shadchin 32: extern int less_is_more;
1.1 etheisen 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);
1.12 ! shadchin 167: while (pos == NULL_POSITION && where >= 0 && where < sc_height-1)
1.1 etheisen 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? */
1.12 ! shadchin 196: return (eof_displayed());
1.1 etheisen 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? */
1.12 ! shadchin 203: case 'D': /* Final page number known? */
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:
1.12 ! shadchin 257: #undef PAGE_NUM
! 258: #define PAGE_NUM(linenum) ((((linenum) - 1) / (sc_height - 1)) + 1)
! 259:
1.1 etheisen 260: switch (c)
261: {
262: case 'b': /* Current byte offset */
263: pos = curr_byte(where);
264: if (pos != NULL_POSITION)
265: ap_pos(pos);
266: else
267: ap_quest();
268: break;
1.7 millert 269: case 'c':
270: ap_int(hshift);
271: break;
272: case 'd': /* Current page number */
273: linenum = currline(where);
274: if (linenum > 0 && sc_height > 1)
1.12 ! shadchin 275: ap_linenum(PAGE_NUM(linenum));
1.7 millert 276: else
277: ap_quest();
278: break;
1.12 ! shadchin 279: case 'D': /* Final page number */
! 280: /* Find the page number of the last byte in the file (len-1). */
1.7 millert 281: len = ch_length();
1.12 ! shadchin 282: if (len == NULL_POSITION)
1.7 millert 283: ap_quest();
1.12 ! shadchin 284: else if (len == 0)
! 285: /* An empty file has no pages. */
! 286: ap_linenum(0);
1.7 millert 287: else
1.12 ! shadchin 288: {
! 289: linenum = find_linenum(len - 1);
! 290: if (linenum <= 0)
! 291: ap_quest();
! 292: else
! 293: ap_linenum(PAGE_NUM(linenum));
! 294: }
1.7 millert 295: break;
1.1 etheisen 296: #if EDITOR
297: case 'E': /* Editor name */
298: ap_str(editor);
299: break;
300: #endif
301: case 'f': /* File name */
302: ap_str(get_filename(curr_ifile));
303: break;
1.12 ! shadchin 304: case 'F': /* Last component of file name */
! 305: ap_str(last_component(get_filename(curr_ifile)));
! 306: break;
1.1 etheisen 307: case 'i': /* Index into list of files */
1.7 millert 308: #if TAGS
309: if (ntags())
310: ap_int(curr_tag());
311: else
312: #endif
313: ap_int(get_index(curr_ifile));
1.1 etheisen 314: break;
315: case 'l': /* Current line number */
1.7 millert 316: linenum = currline(where);
317: if (linenum != 0)
318: ap_linenum(linenum);
1.1 etheisen 319: else
320: ap_quest();
321: break;
322: case 'L': /* Final line number */
323: len = ch_length();
324: if (len == NULL_POSITION || len == ch_zero() ||
1.7 millert 325: (linenum = find_linenum(len)) <= 0)
1.1 etheisen 326: ap_quest();
327: else
1.7 millert 328: ap_linenum(linenum-1);
1.1 etheisen 329: break;
330: case 'm': /* Number of files */
1.7 millert 331: #if TAGS
332: n = ntags();
333: if (n)
334: ap_int(n);
335: else
336: #endif
337: ap_int(nifile());
1.1 etheisen 338: break;
1.7 millert 339: case 'p': /* Percent into file (bytes) */
1.1 etheisen 340: pos = curr_byte(where);
341: len = ch_length();
342: if (pos != NULL_POSITION && len > 0)
343: ap_int(percentage(pos,len));
344: else
345: ap_quest();
346: break;
1.7 millert 347: case 'P': /* Percent into file (lines) */
348: linenum = currline(where);
349: if (linenum == 0 ||
350: (len = ch_length()) == NULL_POSITION || len == ch_zero() ||
351: (last_linenum = find_linenum(len)) <= 0)
352: ap_quest();
353: else
354: ap_int(percentage(linenum, last_linenum));
355: break;
1.1 etheisen 356: case 's': /* Size of file */
357: case 'B':
358: len = ch_length();
359: if (len != NULL_POSITION)
360: ap_pos(len);
361: else
362: ap_quest();
363: break;
364: case 't': /* Truncate trailing spaces in the message */
365: while (mp > message && mp[-1] == ' ')
366: mp--;
1.10 jasper 367: *mp = '\0';
1.1 etheisen 368: break;
1.7 millert 369: case 'T': /* Type of list */
370: #if TAGS
371: if (ntags())
372: ap_str("tag");
373: else
374: #endif
375: ap_str("file");
376: break;
1.1 etheisen 377: case 'x': /* Name of next file */
378: h = next_ifile(curr_ifile);
379: if (h != NULL_IFILE)
380: ap_str(get_filename(h));
381: else
382: ap_quest();
383: break;
384: }
385: }
386:
387: /*
388: * Skip a false conditional.
389: * When a false condition is found (either a false IF or the ELSE part
390: * of a true IF), this routine scans the prototype string to decide
391: * where to resume parsing the string.
392: * We must keep track of nested IFs and skip them properly.
393: */
394: static char *
395: skipcond(p)
1.7 millert 396: register char *p;
1.1 etheisen 397: {
1.7 millert 398: register int iflevel;
1.1 etheisen 399:
400: /*
401: * We came in here after processing a ? or :,
402: * so we start nested one level deep.
403: */
404: iflevel = 1;
405:
406: for (;;) switch (*++p)
407: {
408: case '?':
409: /*
410: * Start of a nested IF.
411: */
412: iflevel++;
413: break;
414: case ':':
415: /*
416: * Else.
417: * If this matches the IF we came in here with,
418: * then we're done.
419: */
420: if (iflevel == 1)
421: return (p);
422: break;
423: case '.':
424: /*
425: * Endif.
426: * If this matches the IF we came in here with,
427: * then we're done.
428: */
429: if (--iflevel == 0)
430: return (p);
431: break;
432: case '\\':
433: /*
434: * Backslash escapes the next character.
435: */
436: ++p;
437: break;
438: case '\0':
439: /*
440: * Whoops. Hit end of string.
441: * This is a malformed conditional, but just treat it
442: * as if all active conditionals ends here.
443: */
444: return (p-1);
445: }
446: /*NOTREACHED*/
447: }
448:
1.7 millert 449: /*
450: * Decode a char that represents a position on the screen.
451: */
1.1 etheisen 452: static char *
453: wherechar(p, wp)
454: char *p;
455: int *wp;
456: {
457: switch (*p)
458: {
1.7 millert 459: case 'b': case 'd': case 'l': case 'p': case 'P':
1.1 etheisen 460: switch (*++p)
461: {
462: case 't': *wp = TOP; break;
463: case 'm': *wp = MIDDLE; break;
464: case 'b': *wp = BOTTOM; break;
465: case 'B': *wp = BOTTOM_PLUS_ONE; break;
466: case 'j': *wp = adjsline(jump_sline); break;
467: default: *wp = TOP; p--; break;
468: }
469: }
470: return (p);
471: }
472:
473: /*
474: * Construct a message based on a prototype string.
475: */
476: public char *
477: pr_expand(proto, maxwidth)
478: char *proto;
479: int maxwidth;
480: {
1.7 millert 481: register char *p;
482: register int c;
1.1 etheisen 483: int where;
484:
485: mp = message;
486:
487: if (*proto == '\0')
488: return ("");
489:
490: for (p = proto; *p != '\0'; p++)
491: {
492: switch (*p)
493: {
494: default: /* Just put the character in the message */
1.7 millert 495: ap_char(*p);
1.1 etheisen 496: break;
497: case '\\': /* Backslash escapes the next character */
498: p++;
1.7 millert 499: ap_char(*p);
1.1 etheisen 500: break;
501: case '?': /* Conditional (IF) */
502: if ((c = *++p) == '\0')
503: --p;
504: else
505: {
1.7 millert 506: where = 0;
1.1 etheisen 507: p = wherechar(p, &where);
508: if (!cond(c, where))
509: p = skipcond(p);
510: }
511: break;
512: case ':': /* ELSE */
513: p = skipcond(p);
514: break;
515: case '.': /* ENDIF */
516: break;
517: case '%': /* Percent escape */
518: if ((c = *++p) == '\0')
519: --p;
520: else
521: {
1.7 millert 522: where = 0;
1.1 etheisen 523: p = wherechar(p, &where);
1.7 millert 524: protochar(c, where,
525: #if EDITOR
526: (proto == editproto));
527: #else
528: 0);
529: #endif
530:
1.1 etheisen 531: }
532: break;
533: }
534: }
535:
536: if (mp == message)
1.12 ! shadchin 537: return ("");
1.1 etheisen 538: if (maxwidth > 0 && mp >= message + maxwidth)
539: {
540: /*
541: * Message is too long.
542: * Return just the final portion of it.
543: */
544: return (mp - maxwidth);
545: }
546: return (message);
547: }
548:
549: /*
550: * Return a message suitable for printing by the "=" command.
551: */
552: public char *
553: eq_message()
554: {
555: return (pr_expand(eqproto, 0));
556: }
557:
558: /*
559: * Return a prompt.
560: * This depends on the prompt type (SHORT, MEDIUM, LONG), etc.
561: * If we can't come up with an appropriate prompt, return NULL
562: * and the caller will prompt with a colon.
563: */
564: public char *
565: pr_string()
566: {
1.7 millert 567: char *prompt;
1.12 ! shadchin 568: int type;
1.7 millert 569:
1.12 ! shadchin 570: type = (!less_is_more) ? pr_type : pr_type ? 0 : 1;
! 571: prompt = pr_expand((ch_getflags() & CH_HELPFILE) ?
! 572: hproto : prproto[type],
! 573: sc_width-so_s_width-so_e_width-2);
1.7 millert 574: new_file = 0;
575: return (prompt);
576: }
577:
578: /*
579: * Return a message suitable for printing while waiting in the F command.
580: */
581: public char *
582: wait_message()
583: {
584: return (pr_expand(wproto, sc_width-so_s_width-so_e_width-2));
1.1 etheisen 585: }
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