2 * Copyright (C) 1984-2023 Mark Nudelman
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.
7 * For more information, see the README file.
14 extern IFILE curr_ifile;
16 extern int jump_sline;
17 extern int perma_marks;
20 * A mark is an ifile (input file) plus a position within the file.
25 * Normally m_ifile != IFILE_NULL and m_filename == NULL.
26 * For restored marks we set m_filename instead of m_ifile
27 * because we don't want to create an ifile until the
28 * user explicitly requests the file (by name or mark).
30 char m_letter; /* Associated character */
31 IFILE m_ifile; /* Input file being marked */
32 char *m_filename; /* Name of the input file */
33 struct scrpos m_scrpos; /* Position of the mark */
38 * Each mark is identified by a lowercase or uppercase letter.
39 * The final one is lmark, for the "last mark"; addressed by the apostrophe.
41 #define NMARKS ((2*26)+2) /* a-z, A-Z, mousemark, lastmark */
42 #define NUMARKS ((2*26)+1) /* user marks (not lastmark) */
43 #define MOUSEMARK (NMARKS-2)
44 #define LASTMARK (NMARKS-1)
45 static struct mark marks[NMARKS];
46 public int marks_modified = 0;
50 * Initialize a mark struct.
52 static void cmark(struct mark *m, IFILE ifile, POSITION pos, int ln)
55 m->m_scrpos.pos = pos;
57 if (m->m_filename != NULL)
58 /* Normally should not happen but a corrupt lesshst file can do it. */
64 * Initialize the mark table to show no marks are set.
66 public void init_mark(void)
70 for (i = 0; i < NMARKS; i++)
74 case MOUSEMARK: letter = '#'; break;
75 case LASTMARK: letter = '\''; break;
76 default: letter = (i < 26) ? 'a'+i : 'A'+i-26; break;
78 marks[i].m_letter = letter;
79 cmark(&marks[i], NULL_IFILE, NULL_POSITION, -1);
84 * Set m_ifile and clear m_filename.
86 static void mark_set_ifile(struct mark *m, IFILE ifile)
89 /* With m_ifile set, m_filename is no longer needed. */
95 * Populate the m_ifile member of a mark struct from m_filename.
97 static void mark_get_ifile(struct mark *m)
99 if (m->m_ifile != NULL_IFILE)
100 return; /* m_ifile is already set */
101 mark_set_ifile(m, get_ifile(m->m_filename, prev_ifile(NULL_IFILE)));
105 * Return the user mark struct identified by a character.
107 static struct mark * getumark(LWCHAR c)
110 if (c >= 'a' && c <= 'z')
111 return (&marks[c-'a']);
112 if (c >= 'A' && c <= 'Z')
113 return (&marks[c-'A'+26]);
115 return (&marks[LASTMARK]);
117 return (&marks[MOUSEMARK]);
118 parg.p_char = (char) c;
119 error("Invalid mark letter %c", &parg);
124 * Get the mark structure identified by a character.
125 * The mark struct may either be in the mark table (user mark)
126 * or may be constructed on the fly for certain characters like ^, $.
128 static struct mark * getmark(LWCHAR c)
131 static struct mark sm;
137 * Beginning of the current file.
140 cmark(m, curr_ifile, ch_zero(), 0);
144 * End of the current file.
148 error("Cannot seek to end of file", NULL_PARG);
152 cmark(m, curr_ifile, ch_tell(), sc_height);
156 * Current position in the current file.
159 get_scrpos(&m->m_scrpos, TOP);
160 cmark(m, curr_ifile, m->m_scrpos.pos, m->m_scrpos.ln);
166 m = &marks[LASTMARK];
170 * Must be a user-defined mark.
175 if (m->m_scrpos.pos == NULL_POSITION)
177 error("Mark not set", NULL_PARG);
186 * Is a mark letter invalid?
188 public int badmark(LWCHAR c)
190 return (getmark(c) == NULL);
194 * Set a user-defined mark.
196 public void setmark(LWCHAR c, int where)
199 struct scrpos scrpos;
204 get_scrpos(&scrpos, where);
205 if (scrpos.pos == NULL_POSITION)
210 cmark(m, curr_ifile, scrpos.pos, scrpos.ln);
215 * Clear a user-defined mark.
217 public void clrmark(LWCHAR c)
224 if (m->m_scrpos.pos == NULL_POSITION)
229 m->m_scrpos.pos = NULL_POSITION;
234 * Set lmark (the mark named by the apostrophe).
236 public void lastmark(void)
238 struct scrpos scrpos;
240 if (ch_getflags() & CH_HELPFILE)
242 get_scrpos(&scrpos, TOP);
243 if (scrpos.pos == NULL_POSITION)
245 cmark(&marks[LASTMARK], curr_ifile, scrpos.pos, scrpos.ln);
252 public void gomark(LWCHAR c)
255 struct scrpos scrpos;
262 * If we're trying to go to the lastmark and
263 * it has not been set to anything yet,
264 * set it to the beginning of the current file.
265 * {{ Couldn't we instead set marks[LASTMARK] in edit()? }}
267 if (m == &marks[LASTMARK] && m->m_scrpos.pos == NULL_POSITION)
268 cmark(m, curr_ifile, ch_zero(), jump_sline);
272 /* Save scrpos; if it's LASTMARK it could change in edit_ifile. */
273 scrpos = m->m_scrpos;
274 if (m->m_ifile != curr_ifile)
277 * Not in the current file; edit the correct file.
279 if (edit_ifile(m->m_ifile))
283 jump_loc(scrpos.pos, scrpos.ln);
287 * Return the position associated with a given mark letter.
289 * We don't return which screen line the position
290 * is associated with, but this doesn't matter much,
291 * because it's always the first non-blank line on the screen.
293 public POSITION markpos(LWCHAR c)
299 return (NULL_POSITION);
301 if (m->m_ifile != curr_ifile)
303 error("Mark not in current file", NULL_PARG);
304 return (NULL_POSITION);
306 return (m->m_scrpos.pos);
310 * Return the mark associated with a given position, if any.
312 public char posmark(POSITION pos)
316 /* Only user marks */
317 for (i = 0; i < NUMARKS; i++)
319 if (marks[i].m_ifile == curr_ifile && marks[i].m_scrpos.pos == pos)
321 if (i < 26) return 'a' + i;
322 if (i < 26*2) return 'A' + (i - 26);
330 * Clear the marks associated with a specified ifile.
332 public void unmark(IFILE ifile)
336 for (i = 0; i < NMARKS; i++)
337 if (marks[i].m_ifile == ifile)
338 marks[i].m_scrpos.pos = NULL_POSITION;
342 * Check if any marks refer to a specified ifile vi m_filename
343 * rather than m_ifile.
345 public void mark_check_ifile(IFILE ifile)
348 char *filename = get_real_filename(ifile);
350 for (i = 0; i < NMARKS; i++)
352 struct mark *m = &marks[i];
353 char *mark_filename = m->m_filename;
354 if (mark_filename != NULL)
356 mark_filename = lrealpath(mark_filename);
357 if (strcmp(filename, mark_filename) == 0)
358 mark_set_ifile(m, ifile);
367 * Save marks to history file.
369 public void save_marks(FILE *fout, char *hdr)
376 fprintf(fout, "%s\n", hdr);
377 for (i = 0; i < NMARKS; i++)
380 struct mark *m = &marks[i];
381 char pos_str[INT_STRLEN_BOUND(m->m_scrpos.pos) + 2];
382 if (m->m_scrpos.pos == NULL_POSITION)
384 postoa(m->m_scrpos.pos, pos_str, 10);
385 filename = m->m_filename;
386 if (filename == NULL)
387 filename = get_real_filename(m->m_ifile);
388 if (strcmp(filename, "-") != 0)
389 fprintf(fout, "m %c %d %s %s\n",
390 m->m_letter, m->m_scrpos.ln, pos_str, filename);
395 * Restore one mark from the history file.
397 public void restore_mark(char *line)
403 #define skip_whitespace while (*line == ' ') line++
407 m = getumark(*line++);
411 ln = lstrtoi(line, &line, 10);
419 pos = lstrtopos(line, &line, 10);
423 cmark(m, NULL_IFILE, pos, ln);
424 m->m_filename = save(line);
427 #endif /* CMD_HISTORY */