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emacs.c
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/* $OpenBSD: emacs.c,v 1.87 2020/05/08 14:30:42 jca Exp $ */
/*
* Emacs-like command line editing and history
*
* created by Ron Natalie at BRL
* modified by Doug Kingston, Doug Gwyn, and Lou Salkind
* adapted to PD ksh by Eric Gisin
*
* partial rewrite by Marco Peereboom <[email protected]>
* under the same license
*/
#include "config.h"
#ifdef EMACS
#include <sys/stat.h>
#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#if !defined(SMALL) && !defined(NO_CURSES)
#ifdef HAVE_CURSES
# include <term.h>
# include <curses.h>
#elif defined(HAVE_NCURSES)
# include <term.h>
# include <ncurses.h>
#elif defined(HAVE_NCURSESNCURSES)
# include <ncurses/term.h>
# include <ncurses/ncurses.h>
#endif
#endif
#include "sys-queue.h"
#include "sh.h"
#include "edit.h"
static Area aedit;
#define AEDIT &aedit /* area for kill ring and macro defns */
#undef CTRL
#define CTRL(x) ((x) == '?' ? 0x7F : (x) & 0x1F) /* ASCII */
#define UNCTRL(x) ((x) == 0x7F ? '?' : (x) | 0x40) /* ASCII */
/* values returned by keyboard functions */
#define KSTD 0
#define KEOL 1 /* ^M, ^J */
#define KINTR 2 /* ^G, ^C */
typedef int (*kb_func)(int);
struct x_ftab {
kb_func xf_func;
const char *xf_name;
short xf_flags;
};
#define XF_ARG 1 /* command takes number prefix */
#define XF_NOBIND 2 /* not allowed to bind to function */
#define XF_PREFIX 4 /* function sets prefix */
/* Separator for completion */
#define is_cfs(c) (c == ' ' || c == '\t' || c == '"' || c == '\'')
/* Separator for motion */
#define is_mfs(c) (!(isalnum((unsigned char)c) || \
c == '_' || c == '$' || c & 0x80))
/* Arguments for do_complete()
* 0 = enumerate M-= complete as much as possible and then list
* 1 = complete M-Esc
* 2 = list M-?
*/
typedef enum {
CT_LIST, /* list the possible completions */
CT_COMPLETE, /* complete to longest prefix */
CT_COMPLIST /* complete and then list (if non-exact) */
} Comp_type;
/* keybindings */
struct kb_entry {
TAILQ_ENTRY(kb_entry) entry;
unsigned char *seq;
int len;
struct x_ftab *ftab;
void *args;
};
TAILQ_HEAD(kb_list, kb_entry);
struct kb_list kblist = TAILQ_HEAD_INITIALIZER(kblist);
/* { from 4.9 edit.h */
/*
* The following are used for my horizontal scrolling stuff
*/
static char *xbuf; /* beg input buffer */
static char *xend; /* end input buffer */
static char *xcp; /* current position */
static char *xep; /* current end */
static char *xbp; /* start of visible portion of input buffer */
static char *xlp; /* last byte visible on screen */
static int x_adj_ok;
/*
* we use x_adj_done so that functions can tell
* whether x_adjust() has been called while they are active.
*/
static int x_adj_done;
static int xx_cols;
static int x_col;
static int x_displen;
static int x_arg; /* general purpose arg */
static int x_arg_defaulted;/* x_arg not explicitly set; defaulted to 1 */
static int xlp_valid;
/* end from 4.9 edit.h } */
static int x_tty; /* are we on a tty? */
static int x_bind_quiet; /* be quiet when binding keys */
static int (*x_last_command)(int);
static char **x_histp; /* history position */
static int x_nextcmd; /* for newline-and-next */
static char *xmp; /* mark pointer */
#define KILLSIZE 20
static char *killstack[KILLSIZE];
static int killsp, killtp;
static int x_literal_set;
static int x_arg_set;
static char *macro_args;
static int prompt_skip;
static int prompt_redraw;
static int x_ins(char *);
static void x_delete(int, int);
static int x_bword(void);
static int x_fword(void);
static void x_goto(char *);
static void x_bs(int);
static int x_size_str(char *);
static int x_size(int);
static void x_zots(char *);
static void x_zotc(int);
static void x_load_hist(char **);
static int x_search(char *, int, int);
static int x_match(char *, char *);
static void x_redraw(int);
static void x_push(int);
static void x_adjust(void);
static void x_e_ungetc(int);
static int x_e_getc(void);
static int x_e_getu8(char *, int);
static void x_e_putc(int);
static void x_e_puts(const char *);
static int x_comment(int);
static int x_fold_case(int);
static char *x_lastcp(void);
static void do_complete(int, Comp_type);
static int isu8cont(unsigned char);
/* proto's for keybindings */
static int x_abort(int);
static int x_beg_hist(int);
static int x_clear_screen(int);
static int x_comp_comm(int);
static int x_comp_file(int);
static int x_complete(int);
static int x_del_back(int);
static int x_del_bword(int);
static int x_del_char(int);
static int x_del_fword(int);
static int x_del_line(int);
static int x_draw_line(int);
static int x_end_hist(int);
static int x_end_of_text(int);
static int x_enumerate(int);
static int x_eot_del(int);
static int x_error(int);
static int x_goto_hist(int);
static int x_ins_string(int);
static int x_insert(int);
static int x_kill(int);
static int x_kill_region(int);
static int x_list_comm(int);
static int x_list_file(int);
static int x_literal(int);
static int x_meta_yank(int);
static int x_mv_back(int);
static int x_mv_begin(int);
static int x_mv_bword(int);
static int x_mv_end(int);
static int x_mv_forw(int);
static int x_mv_fword(int);
static int x_newline(int);
static int x_next_com(int);
static int x_nl_next_com(int);
static int x_noop(int);
static int x_prev_com(int);
static int x_prev_histword(int);
static int x_search_char_forw(int);
static int x_search_char_back(int);
static int x_search_hist(int);
static int x_set_mark(int);
static int x_transpose(int);
static int x_xchg_point_mark(int);
static int x_yank(int);
static int x_comp_list(int);
static int x_expand(int);
static int x_fold_capitalize(int);
static int x_fold_lower(int);
static int x_fold_upper(int);
static int x_set_arg(int);
static int x_comment(int);
#ifdef DEBUG
static int x_debug_info(int);
#endif
static const struct x_ftab x_ftab[] = {
{ x_abort, "abort", 0 },
{ x_beg_hist, "beginning-of-history", 0 },
{ x_clear_screen, "clear-screen", 0 },
{ x_comp_comm, "complete-command", 0 },
{ x_comp_file, "complete-file", 0 },
{ x_complete, "complete", 0 },
{ x_del_back, "delete-char-backward", XF_ARG },
{ x_del_bword, "delete-word-backward", XF_ARG },
{ x_del_char, "delete-char-forward", XF_ARG },
{ x_del_fword, "delete-word-forward", XF_ARG },
{ x_del_line, "kill-line", 0 },
{ x_draw_line, "redraw", 0 },
{ x_end_hist, "end-of-history", 0 },
{ x_end_of_text, "eot", 0 },
{ x_enumerate, "list", 0 },
{ x_eot_del, "eot-or-delete", XF_ARG },
{ x_error, "error", 0 },
{ x_goto_hist, "goto-history", XF_ARG },
{ x_ins_string, "macro-string", XF_NOBIND },
{ x_insert, "auto-insert", XF_ARG },
{ x_kill, "kill-to-eol", XF_ARG },
{ x_kill_region, "kill-region", 0 },
{ x_list_comm, "list-command", 0 },
{ x_list_file, "list-file", 0 },
{ x_literal, "quote", 0 },
{ x_meta_yank, "yank-pop", 0 },
{ x_mv_back, "backward-char", XF_ARG },
{ x_mv_begin, "beginning-of-line", 0 },
{ x_mv_bword, "backward-word", XF_ARG },
{ x_mv_end, "end-of-line", 0 },
{ x_mv_forw, "forward-char", XF_ARG },
{ x_mv_fword, "forward-word", XF_ARG },
{ x_newline, "newline", 0 },
{ x_next_com, "down-history", XF_ARG },
{ x_nl_next_com, "newline-and-next", 0 },
{ x_noop, "no-op", 0 },
{ x_prev_com, "up-history", XF_ARG },
{ x_prev_histword, "prev-hist-word", XF_ARG },
{ x_search_char_forw, "search-character-forward", XF_ARG },
{ x_search_char_back, "search-character-backward", XF_ARG },
{ x_search_hist, "search-history", 0 },
{ x_set_mark, "set-mark-command", 0 },
{ x_transpose, "transpose-chars", 0 },
{ x_xchg_point_mark, "exchange-point-and-mark", 0 },
{ x_yank, "yank", 0 },
{ x_comp_list, "complete-list", 0 },
{ x_expand, "expand-file", 0 },
{ x_fold_capitalize, "capitalize-word", XF_ARG },
{ x_fold_lower, "downcase-word", XF_ARG },
{ x_fold_upper, "upcase-word", XF_ARG },
{ x_set_arg, "set-arg", XF_NOBIND },
{ x_comment, "comment", 0 },
{ 0, 0, 0 },
#ifdef DEBUG
{ x_debug_info, "debug-info", 0 },
#else
{ 0, 0, 0 },
#endif
{ 0, 0, 0 },
};
int
isu8cont(unsigned char c)
{
return (c & (0x80 | 0x40)) == 0x80;
}
int
x_emacs(char *buf, size_t len)
{
struct kb_entry *k, *kmatch = NULL;
char line[LINE + 1];
int at = 0, ntries = 0, submatch, ret;
const char *p;
xbp = xbuf = buf; xend = buf + len;
xlp = xcp = xep = buf;
*xcp = 0;
xlp_valid = true;
xmp = NULL;
x_histp = histptr + 1;
xx_cols = x_cols;
x_col = promptlen(prompt, &p);
prompt_skip = p - prompt;
x_adj_ok = 1;
prompt_redraw = 1;
if (x_col > xx_cols)
x_col = x_col - (x_col / xx_cols) * xx_cols;
x_displen = xx_cols - 2 - x_col;
x_adj_done = 0;
pprompt(prompt, 0);
if (x_displen < 1) {
x_col = 0;
x_displen = xx_cols - 2;
x_e_putc('\n');
prompt_redraw = 0;
}
if (x_nextcmd >= 0) {
int off = source->line - x_nextcmd;
if (histptr - history >= off)
x_load_hist(histptr - off);
x_nextcmd = -1;
}
x_literal_set = 0;
x_arg = -1;
x_last_command = NULL;
while (1) {
x_flush();
if ((at = x_e_getu8(line, at)) < 0)
return 0;
ntries++;
if (x_arg == -1) {
x_arg = 1;
x_arg_defaulted = 1;
}
if (x_literal_set) {
/* literal, so insert it */
x_literal_set = 0;
submatch = 0;
} else {
submatch = 0;
kmatch = NULL;
TAILQ_FOREACH(k, &kblist, entry) {
if (at > k->len)
continue;
if (memcmp(k->seq, line, at) == 0) {
/* sub match */
submatch++;
if (k->len == at)
kmatch = k;
}
/* see if we can abort search early */
if (submatch > 1)
break;
}
}
if (submatch == 1 && kmatch) {
if (kmatch->ftab->xf_func == x_ins_string &&
kmatch->args && !macro_args) {
/* treat macro string as input */
macro_args = kmatch->args;
ret = KSTD;
} else
ret = kmatch->ftab->xf_func(line[at - 1]);
} else {
if (submatch)
continue;
if (ntries > 1) {
ret = x_error(0); /* unmatched meta sequence */
} else if (at > 1) {
x_ins(line);
ret = KSTD;
} else {
ret = x_insert(line[0]);
}
}
switch (ret) {
case KSTD:
if (kmatch)
x_last_command = kmatch->ftab->xf_func;
else
x_last_command = NULL;
break;
case KEOL:
ret = xep - xbuf;
return (ret);
break;
case KINTR:
trapsig(SIGINT);
x_mode(false);
unwind(LSHELL);
x_arg = -1;
break;
default:
bi_errorf("invalid return code"); /* can't happen */
}
/* reset meta sequence */
at = ntries = 0;
if (x_arg_set)
x_arg_set = 0; /* reset args next time around */
else
x_arg = -1;
}
}
static int
x_insert(int c)
{
char str[2];
/*
* Should allow tab and control chars.
*/
if (c == 0) {
x_e_putc(BEL);
return KSTD;
}
str[0] = c;
str[1] = '\0';
while (x_arg--)
x_ins(str);
return KSTD;
}
static int
x_ins_string(int c)
{
return x_insert(c);
}
static int
x_do_ins(const char *cp, size_t len)
{
if (xep+len >= xend) {
x_e_putc(BEL);
return -1;
}
memmove(xcp+len, xcp, xep - xcp + 1);
memmove(xcp, cp, len);
xcp += len;
xep += len;
return 0;
}
static int
x_ins(char *s)
{
char *cp = xcp;
int adj = x_adj_done;
if (x_do_ins(s, strlen(s)) < 0)
return -1;
/*
* x_zots() may result in a call to x_adjust()
* we want xcp to reflect the new position.
*/
xlp_valid = false;
x_lastcp();
x_adj_ok = (xcp >= xlp);
x_zots(cp);
if (adj == x_adj_done) { /* has x_adjust() been called? */
/* no */
for (cp = xlp; cp > xcp; )
x_bs(*--cp);
}
x_adj_ok = 1;
return 0;
}
static int
x_del_back(int c)
{
int col = xcp - xbuf;
if (col == 0) {
x_e_putc(BEL);
return KSTD;
}
if (x_arg > col)
x_arg = col;
while (x_arg < col && isu8cont(xcp[-x_arg]))
x_arg++;
x_goto(xcp - x_arg);
x_delete(x_arg, false);
return KSTD;
}
static int
x_del_char(int c)
{
int nleft = xep - xcp;
if (!nleft) {
x_e_putc(BEL);
return KSTD;
}
if (x_arg > nleft)
x_arg = nleft;
while (x_arg < nleft && isu8cont(xcp[x_arg]))
x_arg++;
x_delete(x_arg, false);
return KSTD;
}
/* Delete nc bytes to the right of the cursor (including cursor position) */
static void
x_delete(int nc, int push)
{
int i,j;
char *cp;
if (nc == 0)
return;
if (xmp != NULL && xmp > xcp) {
if (xcp + nc > xmp)
xmp = xcp;
else
xmp -= nc;
}
/*
* This lets us yank a word we have deleted.
*/
if (push)
x_push(nc);
xep -= nc;
cp = xcp;
j = 0;
i = nc;
while (i--) {
j += x_size((unsigned char)*cp++);
}
memmove(xcp, xcp+nc, xep - xcp + 1); /* Copies the null */
x_adj_ok = 0; /* don't redraw */
xlp_valid = false;
x_zots(xcp);
/*
* if we are already filling the line,
* there is no need to ' ','\b'.
* But if we must, make sure we do the minimum.
*/
if ((i = xx_cols - 2 - x_col) > 0) {
j = (j < i) ? j : i;
i = j;
while (i--)
x_e_putc(' ');
i = j;
while (i--)
x_e_putc('\b');
}
/*x_goto(xcp);*/
x_adj_ok = 1;
xlp_valid = false;
for (cp = x_lastcp(); cp > xcp; )
x_bs(*--cp);
return;
}
static int
x_del_bword(int c)
{
x_delete(x_bword(), true);
return KSTD;
}
static int
x_mv_bword(int c)
{
(void)x_bword();
return KSTD;
}
static int
x_mv_fword(int c)
{
x_goto(xcp + x_fword());
return KSTD;
}
static int
x_del_fword(int c)
{
x_delete(x_fword(), true);
return KSTD;
}
static int
x_bword(void)
{
int nc = 0;
char *cp = xcp;
if (cp == xbuf) {
x_e_putc(BEL);
return 0;
}
while (x_arg--) {
while (cp != xbuf && is_mfs(cp[-1])) {
cp--;
nc++;
}
while (cp != xbuf && !is_mfs(cp[-1])) {
cp--;
nc++;
}
}
x_goto(cp);
return nc;
}
static int
x_fword(void)
{
int nc = 0;
char *cp = xcp;
if (cp == xep) {
x_e_putc(BEL);
return 0;
}
while (x_arg--) {
while (cp != xep && is_mfs(*cp)) {
cp++;
nc++;
}
while (cp != xep && !is_mfs(*cp)) {
cp++;
nc++;
}
}
return nc;
}
static void
x_goto(char *cp)
{
if (cp < xbp || cp >= (xbp + x_displen)) {
/* we are heading off screen */
xcp = cp;
x_adjust();
} else if (cp < xcp) { /* move back */
while (cp < xcp)
x_bs((unsigned char)*--xcp);
} else if (cp > xcp) { /* move forward */
while (cp > xcp)
x_zotc((unsigned char)*xcp++);
}
}
static void
x_bs(int c)
{
int i;
i = x_size(c);
while (i--)
x_e_putc('\b');
}
static int
x_size_str(char *cp)
{
int size = 0;
while (*cp)
size += x_size(*cp++);
return size;
}
static int
x_size(int c)
{
if (c=='\t')
return 4; /* Kludge, tabs are always four spaces. */
if (iscntrl(c)) /* control char */
return 2;
if (isu8cont(c))
return 0;
return 1;
}
static void
x_zots(char *str)
{
int adj = x_adj_done;
if (str > xbuf && isu8cont(*str)) {
while (str > xbuf && isu8cont(*str))
str--;
x_e_putc('\b');
}
x_lastcp();
while (*str && str < xlp && adj == x_adj_done)
x_zotc(*str++);
}
static void
x_zotc(int c)
{
if (c == '\t') {
/* Kludge, tabs are always four spaces. */
x_e_puts(" ");
} else if (iscntrl(c)) {
x_e_putc('^');
x_e_putc(UNCTRL(c));
} else
x_e_putc(c);
}
static int
x_mv_back(int c)
{
int col = xcp - xbuf;
if (col == 0) {
x_e_putc(BEL);
return KSTD;
}
if (x_arg > col)
x_arg = col;
while (x_arg < col && isu8cont(xcp[-x_arg]))
x_arg++;
x_goto(xcp - x_arg);
return KSTD;
}
static int
x_mv_forw(int c)
{
int nleft = xep - xcp;
if (!nleft) {
x_e_putc(BEL);
return KSTD;
}
if (x_arg > nleft)
x_arg = nleft;
while (x_arg < nleft && isu8cont(xcp[x_arg]))
x_arg++;
x_goto(xcp + x_arg);
return KSTD;
}
static int
x_search_char_forw(int c)
{
char *cp = xcp;
*xep = '\0';
c = x_e_getc();
while (x_arg--) {
if (c < 0 ||
((cp = (cp == xep) ? NULL : strchr(cp + 1, c)) == NULL &&
(cp = strchr(xbuf, c)) == NULL)) {
x_e_putc(BEL);
return KSTD;
}
}
x_goto(cp);
return KSTD;
}
static int
x_search_char_back(int c)
{
char *cp = xcp, *p;
c = x_e_getc();
for (; x_arg--; cp = p)
for (p = cp; ; ) {
if (p-- == xbuf)
p = xep;
if (c < 0 || p == cp) {
x_e_putc(BEL);
return KSTD;
}
if (*p == c)
break;
}
x_goto(cp);
return KSTD;
}
static int
x_newline(int c)
{
x_e_putc('\r');
x_e_putc('\n');
x_flush();
*xep++ = '\n';
return KEOL;
}
static int
x_end_of_text(int c)
{
x_zotc(edchars.eof);
x_putc('\r');
x_putc('\n');
x_flush();
return KEOL;
}
static int x_beg_hist(int c) { x_load_hist(history); return KSTD;}
static int x_end_hist(int c) { x_load_hist(histptr); return KSTD;}
static int x_prev_com(int c) { x_load_hist(x_histp - x_arg); return KSTD;}
static int x_next_com(int c) { x_load_hist(x_histp + x_arg); return KSTD;}
/* Goto a particular history number obtained from argument.
* If no argument is given history 1 is probably not what you
* want so we'll simply go to the oldest one.
*/
static int
x_goto_hist(int c)
{
if (x_arg_defaulted)
x_load_hist(history);
else
x_load_hist(histptr + x_arg - source->line);
return KSTD;
}
static void
x_load_hist(char **hp)
{
int oldsize;
if (hp < history || hp > histptr) {
x_e_putc(BEL);
return;
}
x_histp = hp;
oldsize = x_size_str(xbuf);
strlcpy(xbuf, *hp, xend - xbuf);
xbp = xbuf;
xep = xcp = xbuf + strlen(xbuf);
xlp_valid = false;
if (xep <= x_lastcp())
x_redraw(oldsize);
x_goto(xep);
}
static int
x_nl_next_com(int c)
{
x_nextcmd = source->line - (histptr - x_histp) + 1;
return (x_newline(c));
}
static int
x_eot_del(int c)
{
if (xep == xbuf && x_arg_defaulted)
return (x_end_of_text(c));
else
return (x_del_char(c));
}
static kb_func
kb_find_hist_func(char c)
{
struct kb_entry *k;
char line[LINE + 1];
line[0] = c;
line[1] = '\0';
TAILQ_FOREACH(k, &kblist, entry)
if (!strcmp(k->seq, line))
return (k->ftab->xf_func);
return (x_insert);
}
/* reverse incremental history search */
static int
x_search_hist(int c)
{
int offset = -1; /* offset of match in xbuf, else -1 */
char pat [256+1]; /* pattern buffer */
char *p = pat;
int (*f)(int);
*p = '\0';
while (1) {
if (offset < 0) {
x_e_puts("\nI-search: ");
x_e_puts(pat);
}
x_flush();
if ((c = x_e_getc()) < 0)
return KSTD;
f = kb_find_hist_func(c);
if (c == CTRL('[')) {
x_e_ungetc(c);
break;
} else if (f == x_search_hist)
offset = x_search(pat, 0, offset);
else if (f == x_del_back) {
if (p == pat) {
offset = -1;
break;
}
if (p > pat)
*--p = '\0';
if (p == pat)
offset = -1;
else
offset = x_search(pat, 1, offset);
continue;
} else if (f == x_insert) {
/* add char to pattern */
/* overflow check... */
if (p >= &pat[sizeof(pat) - 1]) {
x_e_putc(BEL);
continue;
}
*p++ = c, *p = '\0';
if (offset >= 0) {
/* already have partial match */
offset = x_match(xbuf, pat);
if (offset >= 0) {
x_goto(xbuf + offset + (p - pat) -
(*pat == '^'));
continue;
}
}
offset = x_search(pat, 0, offset);
} else { /* other command */
x_e_ungetc(c);
break;
}
}
if (offset < 0)
x_redraw(-1);
return KSTD;
}
/* search backward from current line */
static int
x_search(char *pat, int sameline, int offset)
{
char **hp;
int i;
for (hp = x_histp - (sameline ? 0 : 1) ; hp >= history; --hp) {
i = x_match(*hp, pat);
if (i >= 0) {
if (offset < 0)
x_e_putc('\n');
x_load_hist(hp);
x_goto(xbuf + i + strlen(pat) - (*pat == '^'));
return i;
}
}
x_e_putc(BEL);
x_histp = histptr;
return -1;
}
/* return position of first match of pattern in string, else -1 */
static int
x_match(char *str, char *pat)
{
if (*pat == '^') {
return (strncmp(str, pat+1, strlen(pat+1)) == 0) ? 0 : -1;
} else {
char *q = strstr(str, pat);
return (q == NULL) ? -1 : q - str;
}
}
static int
x_del_line(int c)
{
int i, j;
*xep = 0;
i = xep - xbuf;
j = x_size_str(xbuf);
xcp = xbuf;
x_push(i);
xlp = xbp = xep = xbuf;
xlp_valid = true;
*xcp = 0;
xmp = NULL;