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/* $OpenBSD: help.c,v 1.37 2023/03/08 04:43:11 guenther Exp $ */
/* This file is in the public domain. */
/*
* Help functions for Mg 2
*/
#include <sys/queue.h>
#include <signal.h>
#include <stdio.h>
#include <string.h>
#include "def.h"
#include "funmap.h"
#include "kbd.h"
#include "key.h"
#include "macro.h"
static int showall(struct buffer *, KEYMAP *, char *);
static int findbind(KEYMAP *, PF, char *, size_t);
/*
* Read a key from the keyboard, and look it up in the keymap.
* Display the name of the function currently bound to the key.
*/
int
desckey(int f, int n)
{
KEYMAP *curmap;
PF funct;
int c, m, i, num;
char *pep;
char dprompt[80];
if (inmacro)
return (TRUE); /* ignore inside keyboard macro */
num = strlcpy(dprompt, "Describe key briefly: ", sizeof(dprompt));
if (num >= sizeof(dprompt))
num = sizeof(dprompt) - 1;
pep = dprompt + num;
key.k_count = 0;
m = curbp->b_nmodes;
curmap = curbp->b_modes[m]->p_map;
for (;;) {
for (;;) {
ewprintf("%s", dprompt);
pep[-1] = ' ';
pep = getkeyname(pep, sizeof(dprompt) - (pep - dprompt),
key.k_chars[key.k_count++] = c = getkey(FALSE));
if ((funct = doscan(curmap, c, &curmap)) != NULL)
break;
*pep++ = '-';
*pep = '\0';
}
if (funct != rescan)
break;
if (ISUPPER(key.k_chars[key.k_count - 1])) {
funct = doscan(curmap,
TOLOWER(key.k_chars[key.k_count - 1]), &curmap);
if (funct == NULL) {
*pep++ = '-';
*pep = '\0';
continue;
}
if (funct != rescan)
break;
}
nextmode:
if (--m < 0)
break;
curmap = curbp->b_modes[m]->p_map;
for (i = 0; i < key.k_count; i++) {
funct = doscan(curmap, key.k_chars[i], &curmap);
if (funct != NULL) {
if (i == key.k_count - 1 && funct != rescan)
goto found;
funct = rescan;
goto nextmode;
}
}
*pep++ = '-';
*pep = '\0';
}
found:
if (funct == rescan || funct == selfinsert)
ewprintf("%k is not bound to any function");
else if ((pep = (char *)function_name(funct)) != NULL)
ewprintf("%k runs the command %s", pep);
else
ewprintf("%k is bound to an unnamed function");
return (TRUE);
}
/*
* This function creates a table, listing all of the command
* keys and their current bindings, and stores the table in the
* *help* pop-up buffer. This lets Mg produce its own wall chart.
*/
int
wallchart(int f, int n)
{
int m;
struct buffer *bp;
bp = bfind("*help*", TRUE);
if (bclear(bp) != TRUE)
/* clear it out */
return (FALSE);
bp->b_flag |= BFREADONLY;
for (m = curbp->b_nmodes; m > 0; m--) {
if ((addlinef(bp, "Local keybindings for mode %s:",
curbp->b_modes[m]->p_name) == FALSE) ||
(showall(bp, curbp->b_modes[m]->p_map, "") == FALSE) ||
(addline(bp, "") == FALSE))
return (FALSE);
}
if ((addline(bp, "Global bindings:") == FALSE) ||
(showall(bp, fundamental_map, "") == FALSE))
return (FALSE);
return (popbuftop(bp, WNONE));
}
static int
showall(struct buffer *bp, KEYMAP *map, char *prefix)
{
KEYMAP *newmap;
char buf[80], keybuf[16];
PF fun;
int c;
if (addline(bp, "") == FALSE)
return (FALSE);
/* XXX - 256 ? */
for (c = 0; c < 256; c++) {
fun = doscan(map, c, &newmap);
if (fun == rescan || fun == selfinsert)
continue;
getkeyname(buf, sizeof(buf), c);
(void)snprintf(keybuf, sizeof(keybuf), "%s%s ", prefix, buf);
if (fun == NULL) {
if (showall(bp, newmap, keybuf) == FALSE)
return (FALSE);
} else {
if (addlinef(bp, "%-16s%s", keybuf,
function_name(fun)) == FALSE)
return (FALSE);
}
}
return (TRUE);
}
int
help_help(int f, int n)
{
KEYMAP *kp;
PF funct;
if ((kp = name_map("help")) == NULL)
return (FALSE);
ewprintf("a b c: ");
do {
funct = doscan(kp, getkey(FALSE), NULL);
} while (funct == NULL || funct == help_help);
if (macrodef && macrocount < MAXMACRO)
macro[macrocount - 1].m_funct = funct;
return ((*funct)(f, n));
}
int
apropos_command(int f, int n)
{
struct buffer *bp;
struct list *fnames, *el;
char string[32];
if (eread("apropos: ", string, sizeof(string), EFNUL | EFNEW) == NULL)
return (ABORT);
/* FALSE means we got a 0 character string, which is fine */
bp = bfind("*help*", TRUE);
if (bclear(bp) == FALSE)
return (FALSE);
fnames = complete_function_list("");
for (el = fnames; el != NULL; el = el->l_next) {
char buf[32];
if (strstr(el->l_name, string) == NULL)
continue;
buf[0] = '\0';
findbind(fundamental_map, name_function(el->l_name),
buf, sizeof(buf));
if (addlinef(bp, "%-32s%s", el->l_name, buf) == FALSE) {
free_file_list(fnames);
return (FALSE);
}
}
free_file_list(fnames);
return (popbuftop(bp, WNONE));
}
static int
findbind(KEYMAP *map, PF fun, char *buf, size_t len)
{
KEYMAP *newmap;
PF nfun;
char buf2[16], keybuf[16];
int c;
/* XXX - 256 ? */
for (c = 0; c < 256; c++) {
nfun = doscan(map, c, &newmap);
if (nfun == fun) {
getkeyname(buf, len, c);
return (TRUE);
}
if (nfun == NULL) {
if (findbind(newmap, fun, buf2, sizeof(buf2)) == TRUE) {
getkeyname(keybuf, sizeof(keybuf), c);
(void)snprintf(buf, len, "%s %s", keybuf, buf2);
return (TRUE);
}
}
}
return (FALSE);
}
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