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command.c
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/*
* Copyright (C) 1984-2025 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.
*/
/*
* User-level command processor.
*/
#include "less.h"
#if MSDOS_COMPILER==WIN32C
#include <windows.h>
#endif
#include "position.h"
#include "option.h"
#include "cmd.h"
extern int erase_char, erase2_char, kill_char;
extern int sigs;
extern int quit_if_one_screen;
extern int one_screen;
extern int sc_width;
extern int sc_height;
extern char *kent;
extern int swindow;
extern int jump_sline;
extern lbool quitting;
extern int wscroll;
extern int top_scroll;
extern int ignore_eoi;
extern int hshift;
extern int bs_mode;
extern int proc_backspace;
extern int show_attn;
extern int chopline;
extern POSITION highest_hilite;
extern char *every_first_cmd;
extern char version[];
extern struct scrpos initial_scrpos;
extern IFILE curr_ifile;
extern void *ml_search;
extern void *ml_examine;
extern int wheel_lines;
extern int def_search_type;
extern lbool search_wrapped;
extern int no_paste;
extern lbool pasting;
extern int no_edit_warn;
extern POSITION soft_eof;
#if SHELL_ESCAPE || PIPEC
extern void *ml_shell;
#endif
#if EDITOR
extern constant char *editproto;
#endif
#if OSC8_LINK
extern char *osc8_uri;
#endif
extern int shift_count;
extern int forw_prompt;
extern int incr_search;
extern int full_screen;
#if MSDOS_COMPILER==WIN32C
extern int utf_mode;
extern unsigned less_acp;
#endif
#if SHELL_ESCAPE
static char *shellcmd = NULL; /* For holding last shell command for "!!" */
#endif
static int mca; /* The multicharacter command (action) */
static int search_type; /* The previous type of search */
static int last_search_type; /* Type of last executed search */
static LINENUM number; /* The number typed by the user */
static long fraction; /* The fractional part of the number */
static struct loption *curropt;
static lbool opt_lower;
static int optflag;
static lbool optgetname;
static POSITION bottompos;
static int save_hshift;
static int save_bs_mode;
static int save_proc_backspace;
static int screen_trashed_value = 0;
static lbool literal_char = FALSE;
static lbool ignoring_input = FALSE;
#if HAVE_TIME
static time_type ignoring_input_time;
#endif
#if PIPEC
static char pipec;
#endif
/* Stack of ungotten chars (via ungetcc) */
struct ungot {
struct ungot *ug_next;
char ug_char;
lbool ug_end_command;
};
static struct ungot* ungot = NULL;
static void multi_search(constant char *pattern, int n, int silent);
/*
* Move the cursor to start of prompt line before executing a command.
* This looks nicer if the command takes a long time before
* updating the screen.
*/
public void cmd_exec(void)
{
clear_attn();
clear_bot();
flush();
}
/*
* Indicate we are reading a multi-character command.
*/
static void set_mca(int action)
{
mca = action;
clear_bot();
clear_cmd();
}
/*
* Indicate we are not reading a multi-character command.
*/
static void clear_mca(void)
{
if (mca == 0)
return;
mca = 0;
}
/*
* Set up the display to start a new multi-character command.
*/
static void start_mca(int action, constant char *prompt, void *mlist, int cmdflags)
{
set_mca(action);
cmd_putstr(prompt);
set_mlist(mlist, cmdflags);
}
public int in_mca(void)
{
return (mca != 0 && mca != A_PREFIX);
}
/*
* Set up the display to start a new search command.
*/
static void mca_search1(void)
{
int i;
#if HILITE_SEARCH
if (search_type & SRCH_FILTER)
set_mca(A_FILTER);
else
#endif
if (search_type & SRCH_FORW)
set_mca(A_F_SEARCH);
else
set_mca(A_B_SEARCH);
if (search_type & SRCH_NO_MATCH)
cmd_putstr("Non-match ");
if (search_type & SRCH_FIRST_FILE)
cmd_putstr("First-file ");
if (search_type & SRCH_PAST_EOF)
cmd_putstr("EOF-ignore ");
if (search_type & SRCH_NO_MOVE)
cmd_putstr("Keep-pos ");
if (search_type & SRCH_NO_REGEX)
cmd_putstr("Regex-off ");
if (search_type & SRCH_WRAP)
cmd_putstr("Wrap ");
for (i = 1; i <= NUM_SEARCH_COLORS; i++)
{
if (search_type & SRCH_SUBSEARCH(i))
{
char buf[INT_STRLEN_BOUND(int)+8];
SNPRINTF1(buf, sizeof(buf), "Sub-%d ", i);
cmd_putstr(buf);
}
}
if (literal_char)
cmd_putstr("Lit ");
#if HILITE_SEARCH
if (search_type & SRCH_FILTER)
cmd_putstr("&/");
else
#endif
if (search_type & SRCH_FORW)
cmd_putstr("/");
else
cmd_putstr("?");
forw_prompt = 0;
}
static void mca_search(void)
{
mca_search1();
set_mlist(ml_search, 0);
}
/*
* Set up the display to start a new toggle-option command.
*/
static void mca_opt_toggle(void)
{
int no_prompt = (optflag & OPT_NO_PROMPT);
int flag = (optflag & ~OPT_NO_PROMPT);
constant char *dash = (flag == OPT_NO_TOGGLE) ? "_" : "-";
set_mca(A_OPT_TOGGLE);
cmd_putstr(dash);
if (optgetname)
cmd_putstr(dash);
if (no_prompt)
cmd_putstr("(P)");
switch (flag)
{
case OPT_UNSET:
cmd_putstr("+");
break;
case OPT_SET:
cmd_putstr("!");
break;
}
forw_prompt = 0;
set_mlist(NULL, CF_OPTION);
}
/*
* Execute a multicharacter command.
*/
static void exec_mca(void)
{
constant char *cbuf;
cmd_exec();
cbuf = get_cmdbuf();
if (cbuf == NULL)
return;
switch (mca)
{
case A_F_SEARCH:
case A_B_SEARCH:
multi_search(cbuf, (int) number, 0);
break;
#if HILITE_SEARCH
case A_FILTER:
search_type ^= SRCH_NO_MATCH;
set_filter_pattern(cbuf, search_type);
soft_eof = NULL_POSITION;
break;
#endif
case A_FIRSTCMD:
/*
* Skip leading spaces or + signs in the string.
*/
while (*cbuf == '+' || *cbuf == ' ')
cbuf++;
if (every_first_cmd != NULL)
free(every_first_cmd);
if (*cbuf == '\0')
every_first_cmd = NULL;
else
every_first_cmd = save(cbuf);
break;
case A_OPT_TOGGLE:
toggle_option(curropt, opt_lower, cbuf, optflag);
curropt = NULL;
break;
case A_F_BRACKET:
match_brac(cbuf[0], cbuf[1], 1, (int) number);
break;
case A_B_BRACKET:
match_brac(cbuf[1], cbuf[0], 0, (int) number);
break;
#if EXAMINE
case A_EXAMINE: {
char *p;
if (!secure_allow(SF_EXAMINE))
break;
p = save(cbuf);
edit_list(p);
free(p);
#if TAGS
/* If tag structure is loaded then clean it up. */
cleantags();
#endif
break; }
#endif
#if SHELL_ESCAPE
case A_SHELL: {
/*
* !! just uses whatever is in shellcmd.
* Otherwise, copy cmdbuf to shellcmd,
* expanding any special characters ("%" or "#").
*/
constant char *done_msg = (*cbuf == CONTROL('P')) ? NULL : "!done";
if (done_msg == NULL)
++cbuf;
if (*cbuf != '!')
{
if (shellcmd != NULL)
free(shellcmd);
shellcmd = fexpand(cbuf);
}
if (!secure_allow(SF_SHELL))
break;
if (shellcmd == NULL)
shellcmd = "";
lsystem(shellcmd, done_msg);
break; }
case A_PSHELL: {
constant char *done_msg = (*cbuf == CONTROL('P')) ? NULL : "#done";
if (done_msg == NULL)
++cbuf;
if (!secure_allow(SF_SHELL))
break;
lsystem(pr_expand(cbuf), done_msg);
break; }
#endif
#if PIPEC
case A_PIPE: {
constant char *done_msg = (*cbuf == CONTROL('P')) ? NULL : "|done";
if (done_msg == NULL)
++cbuf;
if (!secure_allow(SF_PIPE))
break;
(void) pipe_mark(pipec, cbuf);
if (done_msg != NULL)
error(done_msg, NULL_PARG);
break; }
#endif
}
}
/*
* Is a character an erase or kill char?
*/
static lbool is_erase_char(char c)
{
return (c == erase_char || c == erase2_char || c == kill_char);
}
/*
* Is a character a carriage return or newline?
*/
static lbool is_newline_char(char c)
{
return (c == '\n' || c == '\r');
}
/*
* Handle the first char of an option (after the initial dash).
*/
static int mca_opt_first_char(char c)
{
int no_prompt = (optflag & OPT_NO_PROMPT);
int flag = (optflag & ~OPT_NO_PROMPT);
if (flag == OPT_NO_TOGGLE)
{
switch (c)
{
case '_':
/* "__" = long option name. */
optgetname = TRUE;
mca_opt_toggle();
return (MCA_MORE);
}
} else
{
switch (c)
{
case '+':
/* "-+" = UNSET. */
optflag = no_prompt | ((flag == OPT_UNSET) ?
OPT_TOGGLE : OPT_UNSET);
mca_opt_toggle();
return (MCA_MORE);
case '!':
/* "-!" = SET */
optflag = no_prompt | ((flag == OPT_SET) ?
OPT_TOGGLE : OPT_SET);
mca_opt_toggle();
return (MCA_MORE);
case CONTROL('P'):
optflag ^= OPT_NO_PROMPT;
mca_opt_toggle();
return (MCA_MORE);
case '-':
/* "--" = long option name. */
optgetname = TRUE;
mca_opt_toggle();
return (MCA_MORE);
}
}
/* Char was not handled here. */
return (NO_MCA);
}
/*
* Add a char to a long option name.
* See if we've got a match for an option name yet.
* If so, display the complete name and stop
* accepting chars until user hits RETURN.
*/
static int mca_opt_nonfirst_char(char c)
{
constant char *p;
constant char *oname;
lbool ambig;
struct loption *was_curropt;
if (curropt != NULL)
{
/* Already have a match for the name. */
if (is_erase_char(c))
return (MCA_DONE);
/* {{ Checking for TAB here is ugly.
* Also doesn't extend well -- can't do BACKTAB this way
* because it's a multichar sequence. }} */
if (c != '\t')
return (MCA_MORE);
}
/*
* Add char to cmd buffer and try to match
* the option name.
*/
if (cmd_char(c) == CC_QUIT)
return (MCA_DONE);
p = get_cmdbuf();
if (p == NULL || p[0] == '\0')
return (MCA_MORE);
opt_lower = ASCII_IS_LOWER(p[0]);
was_curropt = curropt;
curropt = findopt_name(&p, &oname, &ambig);
if (curropt != NULL)
{
if (was_curropt == NULL)
{
/*
* Got a match.
* Remember the option and
* display the full option name.
*/
cmd_reset();
mca_opt_toggle();
cmd_setstring(oname, !opt_lower);
}
} else if (!ambig)
{
bell();
}
return (MCA_MORE);
}
/*
* Handle a char of an option toggle command.
*/
static int mca_opt_char(char c)
{
PARG parg;
/*
* This may be a short option (single char),
* or one char of a long option name,
* or one char of the option parameter.
*/
if (curropt == NULL && cmdbuf_empty())
{
int ret = mca_opt_first_char(c);
if (ret != NO_MCA)
return (ret);
}
if (optgetname)
{
/* We're getting a long option name. */
if (!is_newline_char(c) && c != '=')
return (mca_opt_nonfirst_char(c));
if (curropt == NULL)
{
parg.p_string = get_cmdbuf();
if (parg.p_string == NULL)
return (MCA_MORE);
error("There is no --%s option", &parg);
return (MCA_DONE);
}
optgetname = FALSE;
cmd_reset();
} else
{
if (is_erase_char(c))
return (NO_MCA);
if (curropt != NULL)
/* We're getting the option parameter. */
return (NO_MCA);
curropt = findopt(c);
if (curropt == NULL)
{
parg.p_string = propt(c);
error("There is no %s option", &parg);
return (MCA_DONE);
}
opt_lower = ASCII_IS_LOWER(c);
}
/*
* If the option which was entered does not take a
* parameter, toggle the option immediately,
* so user doesn't have to hit RETURN.
*/
if ((optflag & ~OPT_NO_PROMPT) != OPT_TOGGLE ||
!opt_has_param(curropt))
{
toggle_option(curropt, opt_lower, "", optflag);
return (MCA_DONE);
}
/*
* Display a prompt appropriate for the option parameter.
*/
start_mca(A_OPT_TOGGLE, opt_prompt(curropt), NULL, CF_OPTION);
return (MCA_MORE);
}
/*
* Normalize search type.
*/
public int norm_search_type(int st)
{
/* WRAP and PAST_EOF are mutually exclusive. */
if ((st & (SRCH_PAST_EOF|SRCH_WRAP)) == (SRCH_PAST_EOF|SRCH_WRAP))
st ^= SRCH_PAST_EOF;
return st;
}
/*
* Handle a char of a search command.
*/
static int mca_search_char(char c)
{
int flag = 0;
/*
* Certain characters as the first char of
* the pattern have special meaning:
* ! Toggle the NO_MATCH flag
* * Toggle the PAST_EOF flag
* @ Toggle the FIRST_FILE flag
*/
if (!cmdbuf_empty() || literal_char)
{
literal_char = FALSE;
return (NO_MCA);
}
switch (c)
{
case CONTROL('E'): /* ignore END of file */
case '*':
if (mca != A_FILTER)
flag = SRCH_PAST_EOF;
search_type &= ~SRCH_WRAP;
break;
case CONTROL('F'): /* FIRST file */
case '@':
if (mca != A_FILTER)
flag = SRCH_FIRST_FILE;
break;
case CONTROL('K'): /* KEEP position */
if (mca != A_FILTER)
flag = SRCH_NO_MOVE;
break;
case CONTROL('S'): { /* SUBSEARCH */
char buf[INT_STRLEN_BOUND(int)+24];
SNPRINTF1(buf, sizeof(buf), "Sub-pattern (1-%d):", NUM_SEARCH_COLORS);
clear_bot();
cmd_putstr(buf);
flush();
c = getcc();
if (c >= '1' && c <= '0'+NUM_SEARCH_COLORS)
flag = SRCH_SUBSEARCH(c-'0');
else
flag = -1; /* calls mca_search() below to repaint */
break; }
case CONTROL('W'): /* WRAP around */
if (mca != A_FILTER)
flag = SRCH_WRAP;
break;
case CONTROL('R'): /* Don't use REGULAR EXPRESSIONS */
flag = SRCH_NO_REGEX;
break;
case CONTROL('N'): /* NOT match */
case '!':
flag = SRCH_NO_MATCH;
break;
case CONTROL('L'):
literal_char = TRUE;
flag = -1;
break;
}
if (flag != 0)
{
if (flag != -1)
search_type = norm_search_type(search_type ^ flag);
mca_search();
return (MCA_MORE);
}
return (NO_MCA);
}
/*
* Handle a character of a multi-character command.
*/
static int mca_char(char c)
{
int ret;
switch (mca)
{
case 0:
/*
* We're not in a multicharacter command.
*/
return (NO_MCA);
case A_PREFIX:
/*
* In the prefix of a command.
* This not considered a multichar command
* (even tho it uses cmdbuf, etc.).
* It is handled in the commands() switch.
*/
return (NO_MCA);
case A_DIGIT:
/*
* Entering digits of a number.
* Terminated by a non-digit.
*/
if ((c >= '0' && c <= '9') || c == '.')
break;
switch (editchar(c, ECF_PEEK|ECF_NOHISTORY|ECF_NOCOMPLETE|ECF_NORIGHTLEFT))
{
case A_NOACTION:
/*
* Ignore this char and get another one.
*/
return (MCA_MORE);
case A_INVALID:
/*
* Not part of the number.
* End the number and treat this char
* as a normal command character.
*/
number = cmd_int(&fraction);
clear_mca();
cmd_accept();
return (NO_MCA);
}
break;
case A_OPT_TOGGLE:
ret = mca_opt_char(c);
if (ret != NO_MCA)
return (ret);
break;
case A_F_SEARCH:
case A_B_SEARCH:
case A_FILTER:
ret = mca_search_char(c);
if (ret != NO_MCA)
return (ret);
break;
default:
/* Other multicharacter command. */
break;
}
/*
* The multichar command is terminated by a newline.
*/
if (is_newline_char(c))
{
if (pasting && no_paste)
{
/* Ignore pasted input after (and including) the first newline */
start_ignoring_input();
return (MCA_MORE);
}
/* Execute the command. */
exec_mca();
return (MCA_DONE);
}
/*
* Append the char to the command buffer.
*/
if (cmd_char(c) == CC_QUIT)
/*
* Abort the multi-char command.
*/
return (MCA_DONE);
switch (mca)
{
case A_F_BRACKET:
case A_B_BRACKET:
if (len_cmdbuf() >= 2)
{
/*
* Special case for the bracket-matching commands.
* Execute the command after getting exactly two
* characters from the user.
*/
exec_mca();
return (MCA_DONE);
}
break;
case A_F_SEARCH:
case A_B_SEARCH:
if (incr_search)
{
/* Incremental search: do a search after every input char. */
int st = (search_type & (SRCH_FORW|SRCH_BACK|SRCH_NO_MATCH|SRCH_NO_REGEX|SRCH_NO_MOVE|SRCH_WRAP|SRCH_SUBSEARCH_ALL));
ssize_t save_updown;
constant char *pattern = get_cmdbuf();
if (pattern == NULL)
return (MCA_MORE);
/*
* Must save updown_match because mca_search
* reinits it. That breaks history scrolling.
* {{ This is ugly. mca_search probably shouldn't call set_mlist. }}
*/
save_updown = save_updown_match();
cmd_exec();
if (*pattern == '\0')
{
/* User has backspaced to an empty pattern. */
undo_search(1);
} else
{
if (search(st | SRCH_INCR, pattern, 1) != 0)
/* No match, invalid pattern, etc. */
undo_search(1);
}
/* Redraw the search prompt and search string. */
if (is_screen_trashed() || !full_screen)
{
clear();
repaint();
}
mca_search1();
restore_updown_match(save_updown);
cmd_repaint(NULL);
}
break;
}
/*
* Need another character.
*/
return (MCA_MORE);
}
/*
* Discard any buffered file data.
*/
static void clear_buffers(void)
{
if (!(ch_getflags() & CH_CANSEEK))
return;
ch_flush();
clr_linenum();
#if HILITE_SEARCH
clr_hilite();
#endif
}
public void screen_trashed_num(int trashed)
{
screen_trashed_value = trashed;
}
public void screen_trashed(void)
{
screen_trashed_num(1);
}
public int is_screen_trashed(void)
{
return screen_trashed_value;
}
/*
* Make sure the screen is displayed.
*/
static void make_display(void)
{
/*
* If not full_screen, we can't rely on scrolling to fill the screen.
* We need to clear and repaint screen before any change.
*/
if (!full_screen && !(quit_if_one_screen && one_screen))
clear();
/*
* If nothing is displayed yet, display starting from initial_scrpos.
*/
if (empty_screen())
{
if (initial_scrpos.pos == NULL_POSITION)
jump_loc(ch_zero(), 1);
else
jump_loc(initial_scrpos.pos, initial_scrpos.ln);
} else if (is_screen_trashed() || !full_screen)
{
int save_top_scroll = top_scroll;
int save_ignore_eoi = ignore_eoi;
top_scroll = 1;
ignore_eoi = 0;
if (is_screen_trashed() == 2)
{
/* Special case used by ignore_eoi: re-open the input file
* and jump to the end of the file. */
reopen_curr_ifile();
jump_forw();
}
repaint();
top_scroll = save_top_scroll;
ignore_eoi = save_ignore_eoi;
}
}
/*
* Display the appropriate prompt.
*/
static void prompt(void)
{
constant char *p;
if (ungot != NULL && !ungot->ug_end_command)
{
/*
* No prompt necessary if commands are from
* ungotten chars rather than from the user.
*/
return;
}
/*
* Make sure the screen is displayed.
*/
make_display();
bottompos = position(BOTTOM_PLUS_ONE);
/*
* If we've hit EOF on the last file and the -E flag is set, quit.
*/
if (get_quit_at_eof() == OPT_ONPLUS &&
eof_displayed(FALSE) && !(ch_getflags() & CH_HELPFILE) &&
next_ifile(curr_ifile) == NULL_IFILE)
quit(QUIT_OK);
/*
* If the entire file is displayed and the -F flag is set, quit.
*/
if (quit_if_one_screen &&
entire_file_displayed() && !(ch_getflags() & CH_HELPFILE) &&
next_ifile(curr_ifile) == NULL_IFILE)
quit(QUIT_OK);
quit_if_one_screen = FALSE; /* only get one chance at this */
#if MSDOS_COMPILER==WIN32C
/*
* In Win32, display the file name in the window title.
*/
if (!(ch_getflags() & CH_HELPFILE))
{
WCHAR w[MAX_PATH+16];
p = pr_expand("Less?f - %f.");
MultiByteToWideChar(less_acp, 0, p, -1, w, countof(w));
SetConsoleTitleW(w);
}
#endif
/*
* Select the proper prompt and display it.
*/
/*
* If the previous action was a forward movement,
* don't clear the bottom line of the display;
* just print the prompt since the forward movement guarantees
* that we're in the right position to display the prompt.
* Clearing the line could cause a problem: for example, if the last
* line displayed ended at the right screen edge without a newline,
* then clearing would clear the last displayed line rather than
* the prompt line.
*/
if (!forw_prompt)
clear_bot();
clear_cmd();
forw_prompt = 0;
p = pr_string();
#if HILITE_SEARCH
if (is_filtering())
putstr("& ");
#endif
if (search_wrapped)
{
if (search_type & SRCH_BACK)
error("Search hit top; continuing at bottom", NULL_PARG);
else
error("Search hit bottom; continuing at top", NULL_PARG);
search_wrapped = FALSE;
}
#if OSC8_LINK
if (osc8_uri != NULL)
{
PARG parg;
parg.p_string = osc8_uri;
error("Link: %s", &parg);
free(osc8_uri);
osc8_uri = NULL;
}
#endif
if (p == NULL || *p == '\0')
{
at_enter(AT_NORMAL|AT_COLOR_PROMPT);
putchr(':');
at_exit();
} else
{
#if MSDOS_COMPILER==WIN32C
WCHAR w[MAX_PATH*2];
char a[MAX_PATH*2];
MultiByteToWideChar(less_acp, 0, p, -1, w, countof(w));
WideCharToMultiByte(utf_mode ? CP_UTF8 : GetConsoleOutputCP(),
0, w, -1, a, sizeof(a), NULL, NULL);
p = a;
#endif
load_line(p);
put_line(FALSE);
}
clear_eol();
}
/*
* Display the less version message.
*/
public void dispversion(void)
{
PARG parg;
parg.p_string = version;
error("less %s", &parg);
}
/*
* Return a character to complete a partial command, if possible.
*/
static char getcc_end_command(void)
{
int ch;
switch (mca)
{
case A_DIGIT:
/* We have a number but no command. Treat as #g. */
return ('g');
case A_F_SEARCH:
case A_B_SEARCH:
case A_FILTER:
/* We have "/string" but no newline. Add the \n. */
return ('\n');
default:
/* Some other incomplete command. Let user complete it. */
if (ungot != NULL)
return ('\0');
ch = getchr();
if (ch < 0) ch = '\0';
return (char) ch;
}
}
/*
* Get a command character from the ungotten stack.