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/*
* Help system
* Copyright
* (C) 1992 Joseph H. Allen
* (C) 2001 Marek 'Marx' Grac
*
* This file is part of JOE (Joe's Own Editor)
*/
#include "config.h"
#include "types.h"
__RCSID("$MirOS: contrib/code/jupp/help.c,v 1.18 2018/01/08 00:40:44 tg Exp $");
#include <stdlib.h>
#include <string.h>
#ifdef HAVE_BSD_STRING_H
#include <bsd/string.h>
#endif
#include "blocks.h"
#include "builtin.h"
#include "help.h"
#include "scrn.h"
#include "utils.h"
#include "vs.h"
#include "utf8.h"
#include "w.h"
struct help *help_actual = NULL; /* actual help screen */
/*
* Process help file
*/
void
help_init(const unsigned char *filename)
{
JFILE *fd; /* help file */
unsigned char buf[1024]; /* input buffer */
struct help *tmp;
char *cp;
/* open the help file */
if (!(fd = jfopen(filename, "r")))
return;
fprintf(stderr, "Processing '%s'...", filename);
fflush(stderr);
while (jfgets(buf, sizeof(buf), fd)) {
if (buf[0] == '{'/*}*/) {
/* start of help screen */
tmp = calloc(1, sizeof(struct help));
/* drop newline */
buf[strlen(buf) - 1] = '\0';
tmp->name = (unsigned char *)strdup((char *)buf + 1);
/* read text */
while (jfgets(buf, sizeof(buf), fd) && buf[0] != /*{*/'}') {
tmp->text = vsncpy(sv(tmp->text), sz(buf));
++tmp->lines;
}
/* end of help screen */
if (buf[0] != /*{*/'}') {
fprintf(stderr, /*{*/ "\nHelp file '%s' is not properly ended with } on new line.\nDo you want to accept incomplete help screen (y/n)?", filename);
fflush(stderr);
if (!fgets((char *)buf, sizeof(buf), stdin) ||
(buf[0] | 0x20) != 'y') {
vsrm(tmp->text);
free(tmp->name);
free(tmp);
goto out;
}
}
/* intern string to save memory */
if ((cp = strdup((char *)tmp->text))) {
vsrm(tmp->text);
tmp->text = (unsigned char *)cp;
}
/* set new help screen as actual one */
tmp->prev = help_actual;
if (help_actual)
help_actual->next = tmp;
help_actual = tmp;
}
}
fprintf(stderr, "done\n");
out:
/* close help file */
jfclose(fd);
/* move to first help screen */
while (help_actual && help_actual->prev)
help_actual = help_actual->prev;
}
/*
* Find context help - find help entry with the same name
*/
struct help *
find_context_help(const unsigned char *name)
{
struct help *tmp = help_actual;
while (tmp->prev != NULL) /* find the first help entry */
tmp = tmp->prev;
while (tmp != NULL && strcmp(tmp->name, name) != 0)
tmp = tmp->next;
return tmp;
}
/*
* Display help text
*/
void
help_display(SCREEN *t)
{
const unsigned char *str;
int y, x, z;
int atr = 0;
if (help_actual) {
str = help_actual->text;
} else {
str = UC "";
}
for (y = skiptop; y != t->wind; ++y) {
if (t->t->updtab[y]) {
const unsigned char *start = str;
int width=0;
int nspans=0;
int spanwidth;
int spancount=0;
int spanextra;
/* First pass: count no. springs \| and determine minimum width */
while(*str && *str!='\n')
if (*str++ == '\\')
switch(*str) {
case 'i':
case 'I':
case 'u':
case 'U':
case 'd':
case 'D':
case 'b':
case 'B':
case 'f':
case 'F':
++str;
break;
case '|':
++str;
++nspans;
break;
case 0:
break;
default:
++str;
++width;
}
else
++width;
str = start;
/* Now calculate span width */
if (width >= t->w - 1 || nspans==0) {
spanwidth = 0;
spanextra = nspans;
} else {
spanwidth = ((t->w - 1) - width)/nspans;
spanextra = nspans - ((t->w - 1) - width - nspans*spanwidth);
}
/* Second pass: display text */
for (x = 0; x != t->w - 1; ++x) {
if (*str == '\n' || !*str) {
if (eraeol(t->t, x, y)) {
return;
} else {
break;
}
} else {
if (*str == '\\') {
switch (*++str) {
case '|':
++str;
for (z=0;z!=spanwidth;++z)
outatr(locale_map,t->t,t->t->scrn+x+y*t->w+z,t->t->attr+x+y*t->w+z,x+z,y,' ',atr);
if (spancount++ >= spanextra) {
outatr(locale_map,t->t,t->t->scrn+x+y*t->w+z,t->t->attr+x+y*t->w+z,x+z,y,' ',atr);
++z;
}
x += z-1;
continue;
case 'i':
case 'I':
atr ^= INVERSE;
++str;
--x;
continue;
case 'u':
case 'U':
atr ^= UNDERLINE;
++str;
--x;
continue;
case 'd':
case 'D':
atr ^= DIM;
++str;
--x;
continue;
case 'b':
case 'B':
atr ^= BOLD;
++str;
--x;
continue;
case 'f':
case 'F':
atr ^= BLINK;
++str;
--x;
continue;
case 0:
--x;
continue;
}
}
outatr_help(t->t,
t->t->scrn + x + y * t->w,
t->t->attr + x + y * t->w,
x, y, *str++, atr);
}
}
atr = 0;
t->t->updtab[y] = 0;
}
while (*str && *str != '\n')
++str;
if (*str == '\n')
++str;
}
}
/*
* Show help screen
*/
int
help_on(SCREEN *t)
{
if (help_actual) {
t->wind = help_actual->lines + skiptop;
if ((t->h - t->wind) < FITHEIGHT) {
t->wind = t->h - FITHEIGHT;
}
if (t->wind < 0) {
t->wind = skiptop;
return -1;
}
wfit(t);
msetI(t->t->updtab + skiptop, 1, t->wind);
return 0;
} else {
return -1;
}
}
/*
* Hide help screen
*/
void
help_off(SCREEN *t)
{
t->wind = skiptop;
wfit(t);
}
/*
* Show/hide current help screen
*/
int
u_help(BASE *base)
{
W *w = base->parent;
struct help *new_help;
if (w->huh && (new_help = find_context_help(w->huh)) != NULL) {
if (help_actual != new_help) {
if (w->t->wind != skiptop)
help_off(w->t);
help_actual = new_help; /* prepare context help */
}
}
if (w->t->wind == skiptop) {
return help_on(w->t); /* help screen is hidden, so show the actual one */
} else {
help_off(w->t); /* hide actual help screen */
return 0;
}
}
/*
* Show next help screen (if it is possible)
*/
int
u_help_next(BASE *base)
{
W *w = base->parent;
if (help_actual && help_actual->next) { /* is there any next help screen? */
if (w->t->wind != skiptop) {
help_off(w->t); /* if help screen was visible, then hide it */
}
help_actual = help_actual->next; /* change to next help screen */
return help_on(w->t); /* show actual help screen */
} else {
return -1;
}
}
/*
* Show previous help screen (if it is possible)
*/
int
u_help_prev(BASE *base)
{
W *w = base->parent;
if (help_actual && help_actual->prev) { /* is there any previous help screen? */
if (w->t->wind != skiptop)
help_off(w->t); /* if help screen was visible, then hide it */
help_actual = help_actual->prev; /* change to previous help screen */
return help_on(w->t); /* show actual help screen */
} else {
return -1;
}
}
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