/*
* Copyright (C) 1984-2023 Mark Nudelman
*
* You may distribute under the terms of either the GNU General Public
* License or the Less License, as specified in the README file.
*
* For more information, see the README file.
*/
#include "less.h"
#include "position.h"
extern IFILE curr_ifile;
extern int sc_height;
extern int jump_sline;
extern int perma_marks;
/*
* A mark is an ifile (input file) plus a position within the file.
*/
struct mark
{
/*
* Normally m_ifile != IFILE_NULL and m_filename == NULL.
* For restored marks we set m_filename instead of m_ifile
* because we don't want to create an ifile until the
* user explicitly requests the file (by name or mark).
*/
char m_letter; /* Associated character */
IFILE m_ifile; /* Input file being marked */
char *m_filename; /* Name of the input file */
struct scrpos m_scrpos; /* Position of the mark */
};
/*
* The table of marks.
* Each mark is identified by a lowercase or uppercase letter.
* The final one is lmark, for the "last mark"; addressed by the apostrophe.
*/
#define NMARKS ((2*26)+2) /* a-z, A-Z, mousemark, lastmark */
#define NUMARKS ((2*26)+1) /* user marks (not lastmark) */
#define MOUSEMARK (NMARKS-2)
#define LASTMARK (NMARKS-1)
static struct mark marks[NMARKS];
public int marks_modified = 0;
/*
* Initialize a mark struct.
*/
static void cmark(struct mark *m, IFILE ifile, POSITION pos, int ln)
{
m->m_ifile = ifile;
m->m_scrpos.pos = pos;
m->m_scrpos.ln = ln;
if (m->m_filename != NULL)
/* Normally should not happen but a corrupt lesshst file can do it. */
free(m->m_filename);
m->m_filename = NULL;
}
/*
* Initialize the mark table to show no marks are set.
*/
public void init_mark(void)
{
int i;
for (i = 0; i < NMARKS; i++)
{
char letter;
switch (i) {
case MOUSEMARK: letter = '#'; break;
case LASTMARK: letter = '\''; break;
default: letter = (i < 26) ? 'a'+i : 'A'+i-26; break;
}
marks[i].m_letter = letter;
cmark(&marks[i], NULL_IFILE, NULL_POSITION, -1);
}
}
/*
* Set m_ifile and clear m_filename.
*/
static void mark_set_ifile(struct mark *m, IFILE ifile)
{
m->m_ifile = ifile;
/* With m_ifile set, m_filename is no longer needed. */
free(m->m_filename);
m->m_filename = NULL;
}
/*
* Populate the m_ifile member of a mark struct from m_filename.
*/
static void mark_get_ifile(struct mark *m)
{
if (m->m_ifile != NULL_IFILE)
return; /* m_ifile is already set */
mark_set_ifile(m, get_ifile(m->m_filename, prev_ifile(NULL_IFILE)));
}
/*
* Return the user mark struct identified by a character.
*/
static struct mark * getumark(LWCHAR c)
{
PARG parg;
if (c >= 'a' && c <= 'z')
return (&marks[c-'a']);
if (c >= 'A' && c <= 'Z')
return (&marks[c-'A'+26]);
if (c == '\'')
return (&marks[LASTMARK]);
if (c == '#')
return (&marks[MOUSEMARK]);
parg.p_char = (char) c;
error("Invalid mark letter %c", &parg);
return (NULL);
}
/*
* Get the mark structure identified by a character.
* The mark struct may either be in the mark table (user mark)
* or may be constructed on the fly for certain characters like ^, $.
*/
static struct mark * getmark(LWCHAR c)
{
struct mark *m;
static struct mark sm;
switch (c)
{
case '^':
/*
* Beginning of the current file.
*/
m = &sm;
cmark(m, curr_ifile, ch_zero(), 0);
break;
case '$':
/*
* End of the current file.
*/
if (ch_end_seek())
{
error("Cannot seek to end of file", NULL_PARG);
return (NULL);
}
m = &sm;
cmark(m, curr_ifile, ch_tell(), sc_height);
break;
case '.':
/*
* Current position in the current file.
*/
m = &sm;
get_scrpos(&m->m_scrpos, TOP);
cmark(m, curr_ifile, m->m_scrpos.pos, m->m_scrpos.ln);
break;
case '\'':
/*
* The "last mark".
*/
m = &marks[LASTMARK];
break;
default:
/*
* Must be a user-defined mark.
*/
m = getumark(c);
if (m == NULL)
break;
if (m->m_scrpos.pos == NULL_POSITION)
{
error("Mark not set", NULL_PARG);
return (NULL);
}
break;
}
return (m);
}
/*
* Is a mark letter invalid?
*/
public int badmark(LWCHAR c)
{
return (getmark(c) == NULL);
}
/*
* Set a user-defined mark.
*/
public void setmark(LWCHAR c, int where)
{
struct mark *m;
struct scrpos scrpos;
m = getumark(c);
if (m == NULL)
return;
get_scrpos(&scrpos, where);
if (scrpos.pos == NULL_POSITION)
{
bell();
return;
}
cmark(m, curr_ifile, scrpos.pos, scrpos.ln);
marks_modified = 1;
}
/*
* Clear a user-defined mark.
*/
public void clrmark(LWCHAR c)
{
struct mark *m;
m = getumark(c);
if (m == NULL)
return;
if (m->m_scrpos.pos == NULL_POSITION)
{
bell();
return;
}
m->m_scrpos.pos = NULL_POSITION;
marks_modified = 1;
}
/*
* Set lmark (the mark named by the apostrophe).
*/
public void lastmark(void)
{
struct scrpos scrpos;
if (ch_getflags() & CH_HELPFILE)
return;
get_scrpos(&scrpos, TOP);
if (scrpos.pos == NULL_POSITION)
return;
cmark(&marks[LASTMARK], curr_ifile, scrpos.pos, scrpos.ln);
marks_modified = 1;
}
/*
* Go to a mark.
*/
public void gomark(LWCHAR c)
{
struct mark *m;
struct scrpos scrpos;
m = getmark(c);
if (m == NULL)
return;
/*
* If we're trying to go to the lastmark and
* it has not been set to anything yet,
* set it to the beginning of the current file.
* {{ Couldn't we instead set marks[LASTMARK] in edit()? }}
*/
if (m == &marks[LASTMARK] && m->m_scrpos.pos == NULL_POSITION)
cmark(m, curr_ifile, ch_zero(), jump_sline);
mark_get_ifile(m);
/* Save scrpos; if it's LASTMARK it could change in edit_ifile. */
scrpos = m->m_scrpos;
if (m->m_ifile != curr_ifile)
{
/*
* Not in the current file; edit the correct file.
*/
if (edit_ifile(m->m_ifile))
return;
}
jump_loc(scrpos.pos, scrpos.ln);
}
/*
* Return the position associated with a given mark letter.
*
* We don't return which screen line the position
* is associated with, but this doesn't matter much,
* because it's always the first non-blank line on the screen.
*/
public POSITION markpos(LWCHAR c)
{
struct mark *m;
m = getmark(c);
if (m == NULL)
return (NULL_POSITION);
if (m->m_ifile != curr_ifile)
{
error("Mark not in current file", NULL_PARG);
return (NULL_POSITION);
}
return (m->m_scrpos.pos);
}
/*
* Return the mark associated with a given position, if any.
*/
public char posmark(POSITION pos)
{
int i;
/* Only user marks */
for (i = 0; i < NUMARKS; i++)
{
if (marks[i].m_ifile == curr_ifile && marks[i].m_scrpos.pos == pos)
{
if (i < 26) return 'a' + i;
if (i < 26*2) return 'A' + (i - 26);
return '#';
}
}
return 0;
}
/*
* Clear the marks associated with a specified ifile.
*/
public void unmark(IFILE ifile)
{
int i;
for (i = 0; i < NMARKS; i++)
if (marks[i].m_ifile == ifile)
marks[i].m_scrpos.pos = NULL_POSITION;
}
/*
* Check if any marks refer to a specified ifile vi m_filename
* rather than m_ifile.
*/
public void mark_check_ifile(IFILE ifile)
{
int i;
char *filename = get_real_filename(ifile);
for (i = 0; i < NMARKS; i++)
{
struct mark *m = &marks[i];
char *mark_filename = m->m_filename;
if (mark_filename != NULL)
{
mark_filename = lrealpath(mark_filename);
if (strcmp(filename, mark_filename) == 0)
mark_set_ifile(m, ifile);
free(mark_filename);
}
}
}
#if CMD_HISTORY
/*
* Save marks to history file.
*/
public void save_marks(FILE *fout, char *hdr)
{
int i;
if (!perma_marks)
return;
fprintf(fout, "%s\n", hdr);
for (i = 0; i < NMARKS; i++)
{
char *filename;
struct mark *m = &marks[i];
char pos_str[INT_STRLEN_BOUND(m->m_scrpos.pos) + 2];
if (m->m_scrpos.pos == NULL_POSITION)
continue;
postoa(m->m_scrpos.pos, pos_str, 10);
filename = m->m_filename;
if (filename == NULL)
filename = get_real_filename(m->m_ifile);
if (strcmp(filename, "-") != 0)
fprintf(fout, "m %c %d %s %s\n",
m->m_letter, m->m_scrpos.ln, pos_str, filename);
}
}
/*
* Restore one mark from the history file.
*/
public void restore_mark(char *line)
{
struct mark *m;
int ln;
POSITION pos;
#define skip_whitespace while (*line == ' ') line++
if (*line++ != 'm')
return;
skip_whitespace;
m = getumark(*line++);
if (m == NULL)
return;
skip_whitespace;
ln = lstrtoi(line, &line, 10);
if (ln < 0)
return;
if (ln < 1)
ln = 1;
if (ln > sc_height)
ln = sc_height;
skip_whitespace;
pos = lstrtopos(line, &line, 10);
if (pos < 0)
return;
skip_whitespace;
cmark(m, NULL_IFILE, pos, ln);
m->m_filename = save(line);
}
