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freebsd/contrib/less/command.c
Xin LI f80a33ea41 MFV: less v643. 
MFC after:	2 weeks
2023-08-13 00:13:31 -07:00

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/* $FreeBSD$ */
/*
* 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.
*/
/*
* 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 squished;
extern int sc_width;
extern int sc_height;
extern char *kent;
extern int swindow;
extern int jump_sline;
extern int quitting;
extern int wscroll;
extern int top_scroll;
extern int ignore_eoi;
extern int secure;
extern int hshift;
extern int bs_mode;
extern int proc_backspace;
extern int show_attn;
extern int less_is_more;
extern int status_col;
extern POSITION highest_hilite;
extern POSITION start_attnpos;
extern POSITION end_attnpos;
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 header_lines;
extern int def_search_type;
extern int updown_match;
#if SHELL_ESCAPE || PIPEC
extern void *ml_shell;
#endif
#if EDITOR
extern char *editor;
extern char *editproto;
#endif
extern int screen_trashed; /* The screen has been overwritten */
extern int shift_count;
extern int oldbot;
extern int forw_prompt;
extern int incr_search;
extern int full_screen;
#if MSDOS_COMPILER==WIN32C
extern int utf_mode;
#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 int opt_lower;
static int optflag;
static int optgetname;
static POSITION bottompos;
static int save_hshift;
static int save_bs_mode;
static int save_proc_backspace;
#if PIPEC
static char pipec;
#endif
/* Stack of ungotten chars (via ungetcc) */
struct ungot {
struct ungot *ug_next;
LWCHAR ug_char;
};
static struct ungot* ungot = NULL;
static void multi_search (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.
*/
static 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 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;
int flag;
char *dash;
no_prompt = (optflag & OPT_NO_PROMPT);
flag = (optflag & ~OPT_NO_PROMPT);
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, 0);
}
/*
* Execute a multicharacter command.
*/
static void exec_mca(void)
{
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);
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:
if (secure)
break;
edit_list(cbuf);
#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 "#").
*/
if (*cbuf != '!')
{
if (shellcmd != NULL)
free(shellcmd);
shellcmd = fexpand(cbuf);
}
if (secure)
break;
if (shellcmd == NULL)
lsystem("", "!done");
else
lsystem(shellcmd, "!done");
break;
case A_PSHELL:
if (secure)
break;
lsystem(pr_expand(cbuf), "#done");
break;
#endif
#if PIPEC
case A_PIPE:
if (secure)
break;
(void) pipe_mark(pipec, cbuf);
error("|done", NULL_PARG);
break;
#endif
}
}
/*
* Is a character an erase or kill char?
*/
static int is_erase_char(int c)
{
return (c == erase_char || c == erase2_char || c == kill_char);
}
/*
* Is a character a carriage return or newline?
*/
static int is_newline_char(int c)
{
return (c == '\n' || c == '\r');
}
/*
* Handle the first char of an option (after the initial dash).
*/
static int mca_opt_first_char(int 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(int c)
{
char *p;
char *oname;
int err;
if (curropt != NULL)
{
/*
* Already have a match for the name.
* Don't accept anything but erase/kill.
*/
if (is_erase_char(c))
return (MCA_DONE);
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)
return (MCA_MORE);
opt_lower = ASCII_IS_LOWER(p[0]);
err = 0;
curropt = findopt_name(&p, &oname, &err);
if (curropt != NULL)
{
/*
* Got a match.
* Remember the option and
* display the full option name.
*/
cmd_reset();
mca_opt_toggle();
for (p = oname; *p != '\0'; p++)
{
c = *p;
if (!opt_lower && ASCII_IS_LOWER(c))
c = ASCII_TO_UPPER(c);
if (cmd_char(c) != CC_OK)
return (MCA_DONE);
}
} else if (err != OPT_AMBIG)
{
bell();
}
return (MCA_MORE);
}
/*
* Handle a char of an option toggle command.
*/
static int mca_opt_char(int 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 && len_cmdbuf() == 0)
{
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), (void*)NULL, 0);
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(int 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 (len_cmdbuf() > 0)
return (NO_MCA);
switch (c)
{
case '*':
if (less_is_more)
break;
case CONTROL('E'): /* ignore END of file */
if (mca != A_FILTER)
flag = SRCH_PAST_EOF;
search_type &= ~SRCH_WRAP;
break;
case '@':
if (less_is_more)
break;
case CONTROL('F'): /* FIRST file */
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;
}
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(int 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))
{
/*
* 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));
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. }}
*/
int save_updown_match = 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 (!full_screen)
{
clear();
repaint();
}
mca_search1();
updown_match = save_updown_match;
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
}
/*
* 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 (screen_trashed || !full_screen)
{
int save_top_scroll = top_scroll;
int save_ignore_eoi = ignore_eoi;
top_scroll = 1;
ignore_eoi = 0;
if (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_char != CHAR_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() && !(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(CP_ACP, 0, p, -1, w, sizeof(w)/sizeof(*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 (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(CP_ACP, 0, p, -1, w, sizeof(w)/sizeof(*w));
WideCharToMultiByte(utf_mode ? CP_UTF8 : GetConsoleOutputCP(),
0, w, -1, a, sizeof(a), NULL, NULL);
p = a;
#endif
load_line(p);
put_line();
}
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 LWCHAR getcc_end_command(void)
{
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. */
return ((ungot == NULL) ? getchr() : 0);
}
}
/*
* Get command character.
* The character normally comes from the keyboard,
* but may come from ungotten characters
* (characters previously given to ungetcc or ungetsc).
*/
static LWCHAR getccu(void)
{
LWCHAR c = 0;
while (c == 0)
{
if (ungot == NULL)
{
/* Normal case: no ungotten chars.
* Get char from the user. */
c = getchr();
} else
{
/* Ungotten chars available:
* Take the top of stack (most recent). */
struct ungot *ug = ungot;
c = ug->ug_char;
ungot = ug->ug_next;
free(ug);
if (c == CHAR_END_COMMAND)
c = getcc_end_command();
}
}
return (c);
}
/*
* Get a command character, but if we receive the orig sequence,
* convert it to the repl sequence.
*/
static LWCHAR getcc_repl(char constant *orig, char constant *repl, LWCHAR (*gr_getc)(void), void (*gr_ungetc)(LWCHAR))
{
LWCHAR c;
LWCHAR keys[16];
int ki = 0;
c = (*gr_getc)();
if (orig == NULL || orig[0] == '\0')
return c;
for (;;)
{
keys[ki] = c;
if (c != orig[ki] || ki >= sizeof(keys)-1)
{
/* This is not orig we have been receiving.
* If we have stashed chars in keys[],
* unget them and return the first one. */
while (ki > 0)
(*gr_ungetc)(keys[ki--]);
return keys[0];
}
if (orig[++ki] == '\0')
{
/* We've received the full orig sequence.
* Return the repl sequence. */
ki = strlen(repl)-1;
while (ki > 0)
(*gr_ungetc)(repl[ki--]);
return repl[0];
}
/* We've received a partial orig sequence (ki chars of it).
* Get next char and see if it continues to match orig. */
c = (*gr_getc)();
}
}
/*
* Get command character.
*/
public int getcc(void)
{
/* Replace kent (keypad Enter) with a newline. */
return getcc_repl(kent, "\n", getccu, ungetcc);
}
/*
* "Unget" a command character.
* The next getcc() will return this character.
*/
public void ungetcc(LWCHAR c)
{
struct ungot *ug = (struct ungot *) ecalloc(1, sizeof(struct ungot));
ug->ug_char = c;
ug->ug_next = ungot;
ungot = ug;
}
/*
* "Unget" a command character.
* If any other chars are already ungotten, put this one after those.
*/
public void ungetcc_back(LWCHAR c)
{
struct ungot *ug = (struct ungot *) ecalloc(1, sizeof(struct ungot));
ug->ug_char = c;
ug->ug_next = NULL;
if (ungot == NULL)
ungot = ug;
else
{
struct ungot *pu;
for (pu = ungot; pu->ug_next != NULL; pu = pu->ug_next)
continue;
pu->ug_next = ug;
}
}
/*
* Unget a whole string of command characters.
* The next sequence of getcc()'s will return this string.
*/
public void ungetsc(char *s)
{
while (*s != '\0')
ungetcc_back(*s++);
}
/*
* Peek the next command character, without consuming it.
*/
public LWCHAR peekcc(void)
{
LWCHAR c = getcc();
ungetcc(c);
return c;
}
/*
* Search for a pattern, possibly in multiple files.
* If SRCH_FIRST_FILE is set, begin searching at the first file.
* If SRCH_PAST_EOF is set, continue the search thru multiple files.
*/
static void multi_search(char *pattern, int n, int silent)
{
int nomore;
IFILE save_ifile;
int changed_file;
changed_file = 0;
save_ifile = save_curr_ifile();
if ((search_type & (SRCH_FORW|SRCH_BACK)) == 0)
search_type |= SRCH_FORW;
if (search_type & SRCH_FIRST_FILE)
{
/*
* Start at the first (or last) file
* in the command line list.
*/
if (search_type & SRCH_FORW)
nomore = edit_first();
else
nomore = edit_last();
if (nomore)
{
unsave_ifile(save_ifile);
return;
}
changed_file = 1;
search_type &= ~SRCH_FIRST_FILE;
}
for (;;)
{
n = search(search_type, pattern, n);
/*
* The SRCH_NO_MOVE flag doesn't "stick": it gets cleared
* after being used once. This allows "n" to work after
* using a /@@ search.
*/
search_type &= ~SRCH_NO_MOVE;
last_search_type = search_type;
if (n == 0)
{
/*
* Found it.
*/
unsave_ifile(save_ifile);
return;
}
if (n < 0)
/*
* Some kind of error in the search.
* Error message has been printed by search().
*/
break;
if ((search_type & SRCH_PAST_EOF) == 0)
/*
* We didn't find a match, but we're
* supposed to search only one file.
*/
break;
/*
* Move on to the next file.
*/
if (search_type & SRCH_FORW)
nomore = edit_next(1);
else
nomore = edit_prev(1);
if (nomore)
break;
changed_file = 1;
}
/*
* Didn't find it.
* Print an error message if we haven't already.
*/
if (n > 0 && !silent)
error("Pattern not found", NULL_PARG);
if (changed_file)
{
/*
* Restore the file we were originally viewing.
*/
reedit_ifile(save_ifile);
} else
{
unsave_ifile(save_ifile);
}
}
/*
* Forward forever, or until a highlighted line appears.
*/
static int forw_loop(int until_hilite)
{
POSITION curr_len;
if (ch_getflags() & CH_HELPFILE)
return (A_NOACTION);
cmd_exec();
jump_forw_buffered();
curr_len = ch_length();
highest_hilite = until_hilite ? curr_len : NULL_POSITION;
ignore_eoi = 1;
while (!sigs)
{
if (until_hilite && highest_hilite > curr_len)
{
bell();
break;
}
make_display();
forward(1, 0, 0);
}
ignore_eoi = 0;
ch_set_eof();
/*
* This gets us back in "F mode" after processing
* a non-abort signal (e.g. window-change).
*/
if (sigs && !ABORT_SIGS())
return (until_hilite ? A_F_UNTIL_HILITE : A_F_FOREVER);
return (A_NOACTION);
}
/*
* Main command processor.
* Accept and execute commands until a quit command.
*/
public void commands(void)
{
int c;
int action;
char *cbuf;
int newaction;
int save_jump_sline;
int save_search_type;
char *extra;
char tbuf[2];
PARG parg;
IFILE old_ifile;
IFILE new_ifile;
char *tagfile;
search_type = SRCH_FORW;
wscroll = (sc_height + 1) / 2;
newaction = A_NOACTION;
for (;;)
{
clear_mca();
cmd_accept();
number = 0;
curropt = NULL;
/*
* See if any signals need processing.
*/
if (sigs)
{
psignals();
if (quitting)
quit(QUIT_SAVED_STATUS);
}
/*
* See if window size changed, for systems that don't
* generate SIGWINCH.
*/
check_winch();
/*
* Display prompt and accept a character.
*/
cmd_reset();
prompt();
if (sigs)
continue;
if (newaction == A_NOACTION)
c = getcc();
again:
if (sigs)
continue;
if (newaction != A_NOACTION)
{
action = newaction;
newaction = A_NOACTION;
} else
{
/*
* If we are in a multicharacter command, call mca_char.
* Otherwise we call fcmd_decode to determine the
* action to be performed.
*/
if (mca)
switch (mca_char(c))
{
case MCA_MORE:
/*
* Need another character.
*/
c = getcc();
goto again;
case MCA_DONE:
/*
* Command has been handled by mca_char.
* Start clean with a prompt.
*/
continue;
case NO_MCA:
/*
* Not a multi-char command
* (at least, not anymore).
*/
break;
}
/*
* Decode the command character and decide what to do.
*/
if (mca)
{
/*
* We're in a multichar command.
* Add the character to the command buffer
* and display it on the screen.
* If the user backspaces past the start
* of the line, abort the command.
*/
if (cmd_char(c) == CC_QUIT || len_cmdbuf() == 0)
continue;
cbuf = get_cmdbuf();
if (cbuf == NULL)
continue;
} else
{
/*
* Don't use cmd_char if we're starting fresh
* at the beginning of a command, because we
* don't want to echo the command until we know
* it is a multichar command. We also don't
* want erase_char/kill_char to be treated
* as line editing characters.
*/
tbuf[0] = c;
tbuf[1] = '\0';
cbuf = tbuf;
}
extra = NULL;
action = fcmd_decode(cbuf, &extra);
/*
* If an "extra" string was returned,
* process it as a string of command characters.
*/
if (extra != NULL)
ungetsc(extra);
}
/*
* Clear the cmdbuf string.
* (But not if we're in the prefix of a command,
* because the partial command string is kept there.)
*/
if (action != A_PREFIX)
cmd_reset();
switch (action)
{
case A_DIGIT:
/*
* First digit of a number.
*/
start_mca(A_DIGIT, ":", (void*)NULL, CF_QUIT_ON_ERASE);
goto again;
case A_F_WINDOW:
/*
* Forward one window (and set the window size).
*/
if (number > 0)
swindow = (int) number;
/* FALLTHRU */
case A_F_SCREEN:
/*
* Forward one screen.
*/
if (number <= 0)
number = get_swindow();
cmd_exec();
if (show_attn)
set_attnpos(bottompos);
forward((int) number, 0, 1);
break;
case A_B_WINDOW:
/*
* Backward one window (and set the window size).
*/
if (number > 0)
swindow = (int) number;
/* FALLTHRU */
case A_B_SCREEN:
/*
* Backward one screen.
*/
if (number <= 0)
number = get_swindow();
cmd_exec();
backward((int) number, 0, 1);
break;
case A_F_LINE:
/*
* Forward N (default 1) line.
*/
if (number <= 0)
number = 1;
cmd_exec();
if (show_attn == OPT_ONPLUS && number > 1)
set_attnpos(bottompos);
forward((int) number, 0, 0);
break;
case A_B_LINE:
/*
* Backward N (default 1) line.
*/
if (number <= 0)
number = 1;
cmd_exec();
backward((int) number, 0, 0);
break;
case A_F_MOUSE:
/*
* Forward wheel_lines lines.
*/
cmd_exec();
forward(wheel_lines, 0, 0);
break;
case A_B_MOUSE:
/*
* Backward wheel_lines lines.
*/
cmd_exec();
backward(wheel_lines, 0, 0);
break;
case A_FF_LINE:
/*
* Force forward N (default 1) line.
*/
if (number <= 0)
number = 1;
cmd_exec();
if (show_attn == OPT_ONPLUS && number > 1)
set_attnpos(bottompos);
forward((int) number, 1, 0);
break;
case A_BF_LINE:
/*
* Force backward N (default 1) line.
*/
if (number <= 0)
number = 1;
cmd_exec();
backward((int) number, 1, 0);
break;
case A_FF_SCREEN:
/*
* Force forward one screen.
*/
if (number <= 0)
number = get_swindow();
cmd_exec();
if (show_attn == OPT_ONPLUS)
set_attnpos(bottompos);
forward((int) number, 1, 0);
break;
case A_F_FOREVER:
/*
* Forward forever, ignoring EOF.
*/
if (show_attn)
set_attnpos(bottompos);
newaction = forw_loop(0);
break;
case A_F_UNTIL_HILITE:
newaction = forw_loop(1);
break;
case A_F_SCROLL:
/*
* Forward N lines
* (default same as last 'd' or 'u' command).
*/
if (number > 0)
wscroll = (int) number;
cmd_exec();
if (show_attn == OPT_ONPLUS)
set_attnpos(bottompos);
forward(wscroll, 0, 0);
break;
case A_B_SCROLL:
/*
* Forward N lines
* (default same as last 'd' or 'u' command).
*/
if (number > 0)
wscroll = (int) number;
cmd_exec();
backward(wscroll, 0, 0);
break;
case A_FREPAINT:
/*
* Flush buffers, then repaint screen.
* Don't flush the buffers on a pipe!
*/
clear_buffers();
/* FALLTHRU */
case A_REPAINT:
/*
* Repaint screen.
*/
cmd_exec();
repaint();
break;
case A_GOLINE:
/*
* Go to line N, default beginning of file.
* If N <= 0, ignore jump_sline in order to avoid
* empty lines before the beginning of the file.
*/
save_jump_sline = jump_sline;
if (number <= 0)
{
number = 1;
jump_sline = 0;
}
cmd_exec();
jump_back(number);
jump_sline = save_jump_sline;
break;
case A_PERCENT:
/*
* Go to a specified percentage into the file.
*/
if (number < 0)
{
number = 0;
fraction = 0;
}
if (number > 100 || (number == 100 && fraction != 0))
{
number = 100;
fraction = 0;
}
cmd_exec();
jump_percent((int) number, fraction);
break;
case A_GOEND:
/*
* Go to line N, default end of file.
*/
cmd_exec();
if (number <= 0)
jump_forw();
else
jump_back(number);
break;
case A_GOEND_BUF:
/*
* Go to line N, default last buffered byte.
*/
cmd_exec();
if (number <= 0)
jump_forw_buffered();
else
jump_back(number);
break;
case A_GOPOS:
/*
* Go to a specified byte position in the file.
*/
cmd_exec();
if (number < 0)
number = 0;
jump_line_loc((POSITION) number, jump_sline);
break;
case A_STAT:
/*
* Print file name, etc.
*/
if (ch_getflags() & CH_HELPFILE)
break;
cmd_exec();
parg.p_string = eq_message();
error("%s", &parg);
break;
case A_VERSION:
/*
* Print version number.
*/
cmd_exec();
dispversion();
break;
case A_QUIT:
/*
* Exit.
*/
if (curr_ifile != NULL_IFILE &&
ch_getflags() & CH_HELPFILE)
{
/*
* Quit while viewing the help file
* just means return to viewing the
* previous file.
*/
hshift = save_hshift;
bs_mode = save_bs_mode;
proc_backspace = save_proc_backspace;
if (edit_prev(1) == 0)
break;
}
if (extra != NULL)
quit(*extra);
quit(QUIT_OK);
break;
/*
* Define abbreviation for a commonly used sequence below.
*/
#define DO_SEARCH() \
if (number <= 0) number = 1; \
mca_search(); \
cmd_exec(); \
multi_search((char *)NULL, (int) number, 0);
case A_F_SEARCH:
/*
* Search forward for a pattern.
* Get the first char of the pattern.
*/
search_type = SRCH_FORW | def_search_type;
if (number <= 0)
number = 1;
mca_search();
c = getcc();
goto again;
case A_B_SEARCH:
/*
* Search backward for a pattern.
* Get the first char of the pattern.
*/
search_type = SRCH_BACK | def_search_type;
if (number <= 0)
number = 1;
mca_search();
c = getcc();
goto again;
case A_FILTER:
#if HILITE_SEARCH
search_type = SRCH_FORW | SRCH_FILTER;
mca_search();
c = getcc();
goto again;
#else
error("Command not available", NULL_PARG);
break;
#endif
case A_AGAIN_SEARCH:
/*
* Repeat previous search.
*/
search_type = last_search_type;
DO_SEARCH();
break;
case A_T_AGAIN_SEARCH:
/*
* Repeat previous search, multiple files.
*/
search_type = last_search_type | SRCH_PAST_EOF;
DO_SEARCH();
break;
case A_REVERSE_SEARCH:
/*
* Repeat previous search, in reverse direction.
*/
save_search_type = search_type = last_search_type;
search_type = SRCH_REVERSE(search_type);
DO_SEARCH();
last_search_type = save_search_type;
break;
case A_T_REVERSE_SEARCH:
/*
* Repeat previous search,
* multiple files in reverse direction.
*/
save_search_type = search_type = last_search_type;
search_type = SRCH_REVERSE(search_type) | SRCH_PAST_EOF;
DO_SEARCH();
last_search_type = save_search_type;
break;
case A_UNDO_SEARCH:
case A_CLR_SEARCH:
/*
* Clear search string highlighting.
*/
undo_search(action == A_CLR_SEARCH);
break;
case A_HELP:
/*
* Help.
*/
if (ch_getflags() & CH_HELPFILE)
break;
cmd_exec();
save_hshift = hshift;
hshift = 0;
save_bs_mode = bs_mode;
bs_mode = BS_SPECIAL;
save_proc_backspace = proc_backspace;
proc_backspace = OPT_OFF;
(void) edit(FAKE_HELPFILE);
break;
case A_EXAMINE:
/*
* Edit a new file. Get the filename.
*/
#if EXAMINE
if (!secure)
{
start_mca(A_EXAMINE, "Examine: ", ml_examine, 0);
c = getcc();
goto again;
}
#endif
error("Command not available", NULL_PARG);
break;
case A_VISUAL:
/*
* Invoke an editor on the input file.
*/
#if EDITOR
if (!secure)
{
if (ch_getflags() & CH_HELPFILE)
break;
if (strcmp(get_filename(curr_ifile), "-") == 0)
{
error("Cannot edit standard input", NULL_PARG);
break;
}
if (get_altfilename(curr_ifile) != NULL)
{
error("WARNING: This file was viewed via LESSOPEN",
NULL_PARG);
}
start_mca(A_SHELL, "!", ml_shell, 0);
/*
* Expand the editor prototype string
* and pass it to the system to execute.
* (Make sure the screen is displayed so the
* expansion of "+%lm" works.)
*/
make_display();
cmd_exec();
lsystem(pr_expand(editproto), (char*)NULL);
break;
}
#endif
error("Command not available", NULL_PARG);
break;
case A_NEXT_FILE:
/*
* Examine next file.
*/
#if TAGS
if (ntags())
{
error("No next file", NULL_PARG);
break;
}
#endif
if (number <= 0)
number = 1;
if (edit_next((int) number))
{
if (get_quit_at_eof() && eof_displayed() &&
!(ch_getflags() & CH_HELPFILE))
quit(QUIT_OK);
parg.p_string = (number > 1) ? "(N-th) " : "";
error("No %snext file", &parg);
}
break;
case A_PREV_FILE:
/*
* Examine previous file.
*/
#if TAGS
if (ntags())
{
error("No previous file", NULL_PARG);
break;
}
#endif
if (number <= 0)
number = 1;
if (edit_prev((int) number))
{
parg.p_string = (number > 1) ? "(N-th) " : "";
error("No %sprevious file", &parg);
}
break;
case A_NEXT_TAG:
/*
* Jump to the next tag in the current tag list.
*/
#if TAGS
if (number <= 0)
number = 1;
tagfile = nexttag((int) number);
if (tagfile == NULL)
{
error("No next tag", NULL_PARG);
break;
}
cmd_exec();
if (edit(tagfile) == 0)
{
POSITION pos = tagsearch();
if (pos != NULL_POSITION)
jump_loc(pos, jump_sline);
}
#else
error("Command not available", NULL_PARG);
#endif
break;
case A_PREV_TAG:
/*
* Jump to the previous tag in the current tag list.
*/
#if TAGS
if (number <= 0)
number = 1;
tagfile = prevtag((int) number);
if (tagfile == NULL)
{
error("No previous tag", NULL_PARG);
break;
}
cmd_exec();
if (edit(tagfile) == 0)
{
POSITION pos = tagsearch();
if (pos != NULL_POSITION)
jump_loc(pos, jump_sline);
}
#else
error("Command not available", NULL_PARG);
#endif
break;
case A_INDEX_FILE:
/*
* Examine a particular file.
*/
if (number <= 0)
number = 1;
if (edit_index((int) number))
error("No such file", NULL_PARG);
break;
case A_REMOVE_FILE:
/*
* Remove a file from the input file list.
*/
if (ch_getflags() & CH_HELPFILE)
break;
old_ifile = curr_ifile;
new_ifile = getoff_ifile(curr_ifile);
if (new_ifile == NULL_IFILE)
{
bell();
break;
}
if (edit_ifile(new_ifile) != 0)
{
reedit_ifile(old_ifile);
break;
}
del_ifile(old_ifile);
break;
case A_OPT_TOGGLE:
/*
* Change the setting of an option.
*/
optflag = OPT_TOGGLE;
optgetname = FALSE;
mca_opt_toggle();
c = getcc();
cbuf = opt_toggle_disallowed(c);
if (cbuf != NULL)
{
error(cbuf, NULL_PARG);
break;
}
goto again;
case A_DISP_OPTION:
/*
* Report the setting of an option.
*/
optflag = OPT_NO_TOGGLE;
optgetname = FALSE;
mca_opt_toggle();
c = getcc();
goto again;
case A_FIRSTCMD:
/*
* Set an initial command for new files.
*/
start_mca(A_FIRSTCMD, "+", (void*)NULL, 0);
c = getcc();
goto again;
case A_SHELL:
case A_PSHELL:
/*
* Shell escape.
*/
#if SHELL_ESCAPE
if (!secure)
{
start_mca(action, (action == A_SHELL) ? "!" : "#", ml_shell, 0);
c = getcc();
goto again;
}
#endif
error("Command not available", NULL_PARG);
break;
case A_SETMARK:
case A_SETMARKBOT:
/*
* Set a mark.
*/
if (ch_getflags() & CH_HELPFILE)
break;
start_mca(A_SETMARK, "set mark: ", (void*)NULL, 0);
c = getcc();
if (is_erase_char(c) || is_newline_char(c))
break;
setmark(c, action == A_SETMARKBOT ? BOTTOM : TOP);
repaint();
break;
case A_CLRMARK:
/*
* Clear a mark.
*/
start_mca(A_CLRMARK, "clear mark: ", (void*)NULL, 0);
c = getcc();
if (is_erase_char(c) || is_newline_char(c))
break;
clrmark(c);
repaint();
break;
case A_GOMARK:
/*
* Jump to a marked position.
*/
start_mca(A_GOMARK, "goto mark: ", (void*)NULL, 0);
c = getcc();
if (is_erase_char(c) || is_newline_char(c))
break;
cmd_exec();
gomark(c);
break;
case A_PIPE:
/*
* Write part of the input to a pipe to a shell command.
*/
#if PIPEC
if (!secure)
{
start_mca(A_PIPE, "|mark: ", (void*)NULL, 0);
c = getcc();
if (is_erase_char(c))
break;
if (is_newline_char(c))
c = '.';
if (badmark(c))
break;
pipec = c;
start_mca(A_PIPE, "!", ml_shell, 0);
c = getcc();
goto again;
}
#endif
error("Command not available", NULL_PARG);
break;
case A_B_BRACKET:
case A_F_BRACKET:
start_mca(action, "Brackets: ", (void*)NULL, 0);
c = getcc();
goto again;
case A_LSHIFT:
/*
* Shift view left.
*/
if (number > 0)
shift_count = number;
else
number = (shift_count > 0) ?
shift_count : sc_width / 2;
if (number > hshift)
number = hshift;
hshift -= number;
screen_trashed = 1;
break;
case A_RSHIFT:
/*
* Shift view right.
*/
if (number > 0)
shift_count = number;
else
number = (shift_count > 0) ?
shift_count : sc_width / 2;
hshift += number;
screen_trashed = 1;
break;
case A_LLSHIFT:
/*
* Shift view left to margin.
*/
hshift = 0;
screen_trashed = 1;
break;
case A_RRSHIFT:
/*
* Shift view right to view rightmost char on screen.
*/
hshift = rrshift();
screen_trashed = 1;
break;
case A_PREFIX:
/*
* The command is incomplete (more chars are needed).
* Display the current char, so the user knows
* what's going on, and get another character.
*/
if (mca != A_PREFIX)
{
cmd_reset();
start_mca(A_PREFIX, " ", (void*)NULL,
CF_QUIT_ON_ERASE);
(void) cmd_char(c);
}
c = getcc();
goto again;
case A_NOACTION:
break;
default:
bell();
break;
}
}
}
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