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nano/src/winio.c
David Lawrence Ramsey e806ab8473 adjust the shortcut list display and related mouse support to not waste 
the last few characters of bottomwin when the screen width isn't a clean
multiple of the column width, per Benno Schulenberg's patch (with a few
tweaks by me)


git-svn-id: svn://svn.savannah.gnu.org/nano/trunk/nano@3390 35c25a1d-7b9e-4130-9fde-d3aeb78583b8
2006-04-18 16:13:35 +00:00

3249 lines
95 KiB
C
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/* $Id$ */
/**************************************************************************
* winio.c *
* *
* Copyright (C) 1999-2004 Chris Allegretta *
* Copyright (C) 2005-2006 David Lawrence Ramsey *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2, or (at your option) *
* any later version. *
* *
* This program is distributed in the hope that it will be useful, but *
* WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU *
* General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program; if not, write to the Free Software *
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA *
* 02110-1301, USA. *
* *
**************************************************************************/
#include "proto.h"
#include <stdio.h>
#include <stdarg.h>
#include <string.h>
#include <unistd.h>
#include <ctype.h>
static int *key_buffer = NULL;
/* The default keystroke buffer,
* containing all the keystrokes we have
* at a given point. */
static size_t key_buffer_len = 0;
/* The length of the default keystroke
* buffer. */
static int statusblank = 0;
/* The number of keystrokes left after
* we call statusbar(), before we
* actually blank the statusbar. */
static bool disable_cursorpos = FALSE;
/* Should we temporarily disable
* constant cursor position display? */
/* Control character compatibility:
*
* - NANO_BACKSPACE_KEY is Ctrl-H, which is Backspace under ASCII, ANSI,
* VT100, and VT220.
* - NANO_TAB_KEY is Ctrl-I, which is Tab under ASCII, ANSI, VT100,
* VT220, and VT320.
* - NANO_ENTER_KEY is Ctrl-M, which is Enter under ASCII, ANSI, VT100,
* VT220, and VT320.
* - NANO_XON_KEY is Ctrl-Q, which is XON under ASCII, ANSI, VT100,
* VT220, and VT320.
* - NANO_XOFF_KEY is Ctrl-S, which is XOFF under ASCII, ANSI, VT100,
* VT220, and VT320.
* - NANO_CONTROL_8 is Ctrl-8 (Ctrl-?), which is Delete under ASCII,
* ANSI, VT100, and VT220, and which is Backspace under VT320.
*
* Note: VT220 and VT320 also generate Esc [ 3 ~ for Delete. By
* default, xterm assumes it's running on a VT320 and generates Ctrl-8
* (Ctrl-?) for Backspace and Esc [ 3 ~ for Delete. This causes
* problems for VT100-derived terminals such as the FreeBSD console,
* which expect Ctrl-H for Backspace and Ctrl-8 (Ctrl-?) for Delete, and
* on which the VT320 sequences are translated by the keypad to KEY_DC
* and [nothing]. We work around this conflict via the REBIND_DELETE
* flag: if it's not set, we assume VT320 compatibility, and if it is,
* we assume VT100 compatibility. Thanks to Lee Nelson and Wouter van
* Hemel for helping work this conflict out.
*
* Escape sequence compatibility:
*
* We support escape sequences for ANSI, VT100, VT220, VT320, the Linux
* console, the FreeBSD console, the Mach console (a.k.a. the Hurd
* console), xterm, rxvt, and Eterm. Among these, there are several
* conflicts and omissions, outlined as follows:
*
* - Tab on ANSI == PageUp on FreeBSD console; the former is omitted.
* (Ctrl-I is also Tab on ANSI, which we already support.)
* - PageDown on FreeBSD console == Center (5) on numeric keypad with
* NumLock off on Linux console; the latter is omitted. (The editing
* keypad key is more important to have working than the numeric
* keypad key, because the latter has no value when NumLock is off.)
* - F1 on FreeBSD console == the mouse key on xterm/rxvt/Eterm; the
* latter is omitted. (Mouse input will only work properly if the
* extended keypad value KEY_MOUSE is generated on mouse events
* instead of the escape sequence.)
* - F9 on FreeBSD console == PageDown on Mach console; the former is
* omitted. (The editing keypad is more important to have working
* than the function keys, because the functions of the former are not
* arbitrary and the functions of the latter are.)
* - F10 on FreeBSD console == PageUp on Mach console; the former is
* omitted. (Same as above.)
* - F13 on FreeBSD console == End on Mach console; the former is
* omitted. (Same as above.)
* - F15 on FreeBSD console == Shift-Up on rxvt/Eterm; the former is
* omitted. (The arrow keys, with or without modifiers, are more
* important to have working than the function keys, because the
* functions of the former are not arbitrary and the functions of the
* latter are.)
* - F16 on FreeBSD console == Shift-Down on rxvt/Eterm; the former is
* omitted. (Same as above.)
*
* Note that Center (5) on the numeric keypad with NumLock off can also
* be the Begin key. */
#ifndef NANO_TINY
/* Reset all the input routines that rely on character sequences. */
void reset_kbinput(void)
{
parse_kbinput(NULL, NULL, NULL, TRUE);
get_byte_kbinput(0, TRUE);
get_unicode_kbinput(0, TRUE);
}
#endif
/* Read in a sequence of keystrokes from win and save them in the
* default keystroke buffer. This should only be called when the
* default keystroke buffer is empty. */
void get_key_buffer(WINDOW *win)
{
int input;
size_t errcount;
/* If the keystroke buffer isn't empty, get out. */
if (key_buffer != NULL)
return;
/* Read in the first character using blocking input. */
#ifndef NANO_TINY
allow_pending_sigwinch(TRUE);
#endif
/* Just before reading in the first character, display any pending
* screen updates. */
doupdate();
errcount = 0;
while ((input = wgetch(win)) == ERR) {
errcount++;
/* If we've failed to get a character MAX_BUF_SIZE times in a
* row, assume that the input source we were using is gone and
* die gracefully. We could check if errno is set to EIO
* ("Input/output error") and die gracefully in that case, but
* it's not always set properly. Argh. */
if (errcount == MAX_BUF_SIZE)
handle_hupterm(0);
}
#ifndef NANO_TINY
allow_pending_sigwinch(FALSE);
#endif
/* Increment the length of the keystroke buffer, save the value of
* the keystroke in key, and set key_code to TRUE if the keystroke
* is an extended keypad value or FALSE if it isn't. */
key_buffer_len++;
key_buffer = (int *)nmalloc(sizeof(int));
key_buffer[0] = input;
/* Read in the remaining characters using non-blocking input. */
nodelay(win, TRUE);
while (TRUE) {
#ifndef NANO_TINY
allow_pending_sigwinch(TRUE);
#endif
input = wgetch(win);
/* If there aren't any more characters, stop reading. */
if (input == ERR)
break;
/* Otherwise, increment the length of the keystroke buffer, save
* the value of the keystroke in key, and set key_code to TRUE
* if the keystroke is an extended keypad value or FALSE if it
* isn't. */
key_buffer_len++;
key_buffer = (int *)nrealloc(key_buffer, key_buffer_len *
sizeof(int));
key_buffer[key_buffer_len - 1] = input;
#ifndef NANO_TINY
allow_pending_sigwinch(FALSE);
#endif
}
/* Switch back to non-blocking input. */
nodelay(win, FALSE);
#ifdef DEBUG
fprintf(stderr, "get_key_buffer(): key_buffer_len = %lu\n", (unsigned long)key_buffer_len);
#endif
}
/* Return the length of the default keystroke buffer. */
size_t get_key_buffer_len(void)
{
return key_buffer_len;
}
/* Add the contents of the keystroke buffer input to the default
* keystroke buffer. */
void unget_input(int *input, size_t input_len)
{
#ifndef NANO_TINY
allow_pending_sigwinch(TRUE);
allow_pending_sigwinch(FALSE);
#endif
/* If input is empty, get out. */
if (input_len == 0)
return;
/* If adding input would put the default keystroke buffer beyond
* maximum capacity, only add enough of input to put it at maximum
* capacity. */
if (key_buffer_len + input_len < key_buffer_len)
input_len = (size_t)-1 - key_buffer_len;
/* Add the length of input to the length of the default keystroke
* buffer, and reallocate the default keystroke buffer so that it
* has enough room for input. */
key_buffer_len += input_len;
key_buffer = (int *)nrealloc(key_buffer, key_buffer_len *
sizeof(int));
/* If the default keystroke buffer wasn't empty before, move its
* beginning forward far enough so that we can add input to its
* beginning. */
if (key_buffer_len > input_len)
memmove(key_buffer + input_len, key_buffer,
(key_buffer_len - input_len) * sizeof(int));
/* Copy input to the beginning of the default keystroke buffer. */
memcpy(key_buffer, input, input_len * sizeof(int));
}
/* Put back the character stored in kbinput, putting it in byte range
* beforehand. If meta_key is TRUE, put back the Escape character after
* putting back kbinput. If func_key is TRUE, put back the function key
* (a value outside byte range) without putting it in byte range. */
void unget_kbinput(int kbinput, bool meta_key, bool func_key)
{
if (!func_key)
kbinput = (char)kbinput;
unget_input(&kbinput, 1);
if (meta_key) {
kbinput = NANO_CONTROL_3;
unget_input(&kbinput, 1);
}
}
/* Try to read input_len characters from the default keystroke buffer.
* If the default keystroke buffer is empty and win isn't NULL, try to
* read in more characters from win and add them to the default
* keystroke buffer before doing anything else. If the default
* keystroke buffer is empty and win is NULL, return NULL. */
int *get_input(WINDOW *win, size_t input_len)
{
int *input;
#ifndef NANO_TINY
allow_pending_sigwinch(TRUE);
allow_pending_sigwinch(FALSE);
#endif
if (key_buffer_len == 0) {
if (win != NULL)
get_key_buffer(win);
if (key_buffer_len == 0)
return NULL;
}
/* If input_len is greater than the length of the default keystroke
* buffer, only read the number of characters in the default
* keystroke buffer. */
if (input_len > key_buffer_len)
input_len = key_buffer_len;
/* Subtract input_len from the length of the default keystroke
* buffer, and allocate the keystroke buffer input so that it
* has enough room for input_len keystrokes. */
key_buffer_len -= input_len;
input = (int *)nmalloc(input_len * sizeof(int));
/* Copy input_len characters from the beginning of the default
* keystroke buffer into input. */
memcpy(input, key_buffer, input_len * sizeof(int));
/* If the default keystroke buffer is empty, mark it as such. */
if (key_buffer_len == 0) {
free(key_buffer);
key_buffer = NULL;
/* If the default keystroke buffer isn't empty, move its
* beginning forward far enough so that the keystrokes in input are
* no longer at its beginning. */
} else {
memmove(key_buffer, key_buffer + input_len, key_buffer_len *
sizeof(int));
key_buffer = (int *)nrealloc(key_buffer, key_buffer_len *
sizeof(int));
}
return input;
}
/* Read in a single character. If it's ignored, swallow it and go on.
* Otherwise, try to translate it from ASCII, meta key sequences, escape
* sequences, and/or extended keypad values. Set meta_key to TRUE when
* we get a meta key sequence, and set func_key to TRUE when we get an
* extended keypad value. Supported extended keypad values consist of
* [arrow key], Ctrl-[arrow key], Shift-[arrow key], Enter, Backspace,
* the editing keypad (Insert, Delete, Home, End, PageUp, and PageDown),
* the function keypad (F1-F16), and the numeric keypad with NumLock
* off. Assume nodelay(win) is FALSE. */
int get_kbinput(WINDOW *win, bool *meta_key, bool *func_key)
{
int kbinput;
/* Read in a character and interpret it. Continue doing this until
* we get a recognized value or sequence. */
while ((kbinput = parse_kbinput(win, meta_key, func_key
#ifndef NANO_TINY
, FALSE
#endif
)) == ERR);
return kbinput;
}
/* Translate ASCII characters, extended keypad values, and escape
* sequences into their corresponding key values. Set meta_key to TRUE
* when we get a meta key sequence, and set func_key to TRUE when we get
* a function key. Assume nodelay(win) is FALSE. */
int parse_kbinput(WINDOW *win, bool *meta_key, bool *func_key
#ifndef NANO_TINY
, bool reset
#endif
)
{
static int escapes = 0, byte_digits = 0;
int *kbinput, retval = ERR;
#ifndef NANO_TINY
if (reset) {
escapes = 0;
byte_digits = 0;
return ERR;
}
#endif
*meta_key = FALSE;
*func_key = FALSE;
/* Read in a character. */
while ((kbinput = get_input(win, 1)) == NULL);
switch (*kbinput) {
case ERR:
break;
case NANO_CONTROL_3:
/* Increment the escape counter. */
escapes++;
switch (escapes) {
case 1:
/* One escape: wait for more input. */
case 2:
/* Two escapes: wait for more input. */
break;
default:
/* More than two escapes: reset the escape counter
* and wait for more input. */
escapes = 0;
}
break;
#if !defined(NANO_TINY) && defined(KEY_RESIZE)
/* Since we don't change the default SIGWINCH handler when
* NANO_TINY is defined, KEY_RESIZE is never generated. Also,
* Slang and SunOS 5.7-5.9 don't support KEY_RESIZE. */
case KEY_RESIZE:
break;
#endif
#ifdef PDCURSES
case KEY_SHIFT_L:
case KEY_SHIFT_R:
case KEY_CONTROL_L:
case KEY_CONTROL_R:
case KEY_ALT_L:
case KEY_ALT_R:
break;
#endif
default:
switch (escapes) {
case 0:
switch (*kbinput) {
case NANO_CONTROL_8:
retval = ISSET(REBIND_DELETE) ?
NANO_DELETE_KEY : NANO_BACKSPACE_KEY;
break;
case KEY_DOWN:
retval = NANO_NEXTLINE_KEY;
break;
case KEY_UP:
retval = NANO_PREVLINE_KEY;
break;
case KEY_LEFT:
retval = NANO_BACK_KEY;
break;
case KEY_RIGHT:
retval = NANO_FORWARD_KEY;
break;
#ifdef KEY_HOME
/* HP-UX 10 and 11 don't support KEY_HOME. */
case KEY_HOME:
retval = NANO_HOME_KEY;
break;
#endif
case KEY_BACKSPACE:
retval = NANO_BACKSPACE_KEY;
break;
case KEY_DC:
retval = ISSET(REBIND_DELETE) ?
NANO_BACKSPACE_KEY : NANO_DELETE_KEY;
break;
case KEY_IC:
retval = NANO_INSERTFILE_KEY;
break;
case KEY_NPAGE:
retval = NANO_NEXTPAGE_KEY;
break;
case KEY_PPAGE:
retval = NANO_PREVPAGE_KEY;
break;
case KEY_ENTER:
retval = NANO_ENTER_KEY;
break;
case KEY_A1: /* Home (7) on numeric keypad
* with NumLock off. */
retval = NANO_HOME_KEY;
break;
case KEY_A3: /* PageUp (9) on numeric keypad
* with NumLock off. */
retval = NANO_PREVPAGE_KEY;
break;
case KEY_B2: /* Center (5) on numeric keypad
* with NumLock off. */
break;
case KEY_C1: /* End (1) on numeric keypad
* with NumLock off. */
retval = NANO_END_KEY;
break;
case KEY_C3: /* PageDown (4) on numeric
* keypad with NumLock off. */
retval = NANO_NEXTPAGE_KEY;
break;
#ifdef KEY_BEG
/* Slang doesn't support KEY_BEG. */
case KEY_BEG: /* Center (5) on numeric keypad
* with NumLock off. */
break;
#endif
#ifdef KEY_END
/* HP-UX 10 and 11 don't support KEY_END. */
case KEY_END:
retval = NANO_END_KEY;
break;
#endif
#ifdef KEY_SBEG
/* Slang doesn't support KEY_SBEG. */
case KEY_SBEG: /* Center (5) on numeric keypad
* with NumLock off. */
break;
#endif
#ifdef KEY_SDC
/* Slang doesn't support KEY_SDC. */
case KEY_SDC:
retval = ISSET(REBIND_DELETE) ?
NANO_BACKSPACE_KEY : NANO_DELETE_KEY;
break;
#endif
#ifdef KEY_SEND
/* HP-UX 10 and 11 don't support KEY_SEND. */
case KEY_SEND:
retval = NANO_END_KEY;
break;
#endif
#ifdef KEY_SHOME
/* HP-UX 10 and 11 and Slang don't support
* KEY_SHOME. */
case KEY_SHOME:
retval = NANO_HOME_KEY;
break;
#endif
#ifdef KEY_SIC
/* Slang doesn't support KEY_SIC. */
case KEY_SIC:
retval = NANO_INSERTFILE_KEY;
break;
#endif
#ifdef KEY_SLEFT
/* Slang doesn't support KEY_SLEFT. */
case KEY_SLEFT:
retval = NANO_BACK_KEY;
break;
#endif
#ifdef KEY_SRIGHT
/* Slang doesn't support KEY_SRIGHT. */
case KEY_SRIGHT:
retval = NANO_FORWARD_KEY;
break;
#endif
#ifdef KEY_SSUSPEND
/* Slang doesn't support KEY_SSUSPEND. */
case KEY_SSUSPEND:
retval = NANO_SUSPEND_KEY;
break;
#endif
#ifdef KEY_SUSPEND
/* Slang doesn't support KEY_SUSPEND. */
case KEY_SUSPEND:
retval = NANO_SUSPEND_KEY;
break;
#endif
default:
retval = *kbinput;
break;
}
break;
case 1:
/* One escape followed by a non-escape: escape
* sequence mode. Reset the escape counter. If
* there aren't any other keys waiting, we have a
* meta key sequence, so set meta_key to TRUE and
* save the lowercase version of the non-escape
* character as the result. If there are other keys
* waiting, we have a true escape sequence, so
* interpret it. */
escapes = 0;
if (get_key_buffer_len() == 0) {
*meta_key = TRUE;
retval = tolower(*kbinput);
} else {
int *seq;
size_t seq_len;
bool ignore_seq;
/* Put back the non-escape character, get the
* complete escape sequence, translate the
* sequence into its corresponding key value,
* and save that as the result. */
unget_input(kbinput, 1);
seq_len = get_key_buffer_len();
seq = get_input(NULL, seq_len);
retval = get_escape_seq_kbinput(seq, seq_len,
&ignore_seq);
/* If the escape sequence is unrecognized and
* not ignored, put back all of its characters
* except for the initial escape. */
if (retval == ERR && !ignore_seq)
unget_input(seq, seq_len);
free(seq);
}
break;
case 2:
/* Two escapes followed by one or more decimal
* digits: byte sequence mode. If the byte
* sequence's range is limited to 2XX (the first
* digit is in the '0' to '2' range and it's the
* first digit, or it's in the '0' to '9' range and
* it's not the first digit), increment the byte
* sequence counter and interpret the digit. If the
* byte sequence's range is not limited to 2XX, fall
* through. */
if (('0' <= *kbinput && *kbinput <= '6' &&
byte_digits == 0) || ('0' <= *kbinput &&
*kbinput <= '9' && byte_digits > 0)) {
int byte;
byte_digits++;
byte = get_byte_kbinput(*kbinput
#ifndef NANO_TINY
, FALSE
#endif
);
if (byte != ERR) {
char *byte_mb;
int byte_mb_len, *seq, i;
/* If we've read in a complete byte
* sequence, reset the byte sequence counter
* and the escape counter, and put back the
* corresponding byte value. */
byte_digits = 0;
escapes = 0;
/* Put back the multibyte equivalent of the
* byte value. */
byte_mb = make_mbchar((long)byte,
&byte_mb_len);
seq = (int *)nmalloc(byte_mb_len *
sizeof(int));
for (i = 0; i < byte_mb_len; i++)
seq[i] = (unsigned char)byte_mb[i];
unget_input(seq, byte_mb_len);
free(byte_mb);
free(seq);
}
} else {
/* Reset the escape counter. */
escapes = 0;
if (byte_digits == 0)
/* Two escapes followed by a non-decimal
* digit or a decimal digit that would
* create a byte sequence greater than 2XX,
* and we're not in the middle of a byte
* sequence: control character sequence
* mode. Interpret the control sequence and
* save the corresponding control character
* as the result. */
retval = get_control_kbinput(*kbinput);
else {
/* If we're in the middle of a byte
* sequence, reset the byte sequence counter
* and save the character we got as the
* result. */
byte_digits = 0;
retval = *kbinput;
}
}
break;
}
}
/* If we have a result and it's an extended keypad value (i.e, a
* value outside of byte range), set func_key to TRUE. */
if (retval != ERR)
*func_key = !is_byte(retval);
#ifdef DEBUG
fprintf(stderr, "parse_kbinput(): kbinput = %d, meta_key = %d, func_key = %d, escapes = %d, byte_digits = %d, retval = %d\n", *kbinput, (int)*meta_key, (int)*func_key, escapes, byte_digits, retval);
#endif
/* Return the result. */
return retval;
}
/* Translate escape sequences, most of which correspond to extended
* keypad values, into their corresponding key values. These sequences
* are generated when the keypad doesn't support the needed keys. If
* the escape sequence is recognized but we want to ignore it, return
* ERR and set ignore_seq to TRUE; if it's unrecognized, return ERR and
* set ignore_seq to FALSE. Assume that Escape has already been read
* in. */
int get_escape_seq_kbinput(const int *seq, size_t seq_len, bool
*ignore_seq)
{
int retval = ERR;
*ignore_seq = FALSE;
if (seq_len > 1) {
switch (seq[0]) {
case 'O':
switch (seq[1]) {
case '2':
if (seq_len >= 3) {
switch (seq[2]) {
case 'P': /* Esc O 2 P == F13 on
* xterm. */
retval = KEY_F(13);
break;
case 'Q': /* Esc O 2 Q == F14 on
* xterm. */
retval = KEY_F(14);
break;
case 'R': /* Esc O 2 R == F15 on
* xterm. */
retval = KEY_F(15);
break;
case 'S': /* Esc O 2 S == F16 on
* xterm. */
retval = KEY_F(16);
break;
}
}
break;
case 'A': /* Esc O A == Up on VT100/VT320/xterm. */
case 'B': /* Esc O B == Down on
* VT100/VT320/xterm. */
case 'C': /* Esc O C == Right on
* VT100/VT320/xterm. */
case 'D': /* Esc O D == Left on
* VT100/VT320/xterm. */
retval = get_escape_seq_abcd(seq[1]);
break;
case 'E': /* Esc O E == Center (5) on numeric keypad
* with NumLock off on xterm. */
*ignore_seq = TRUE;
break;
case 'F': /* Esc O F == End on xterm. */
retval = NANO_END_KEY;
break;
case 'H': /* Esc O H == Home on xterm. */
retval = NANO_HOME_KEY;
break;
case 'M': /* Esc O M == Enter on numeric keypad with
* NumLock off on VT100/VT220/VT320/xterm/
* Eterm. */
retval = NANO_ENTER_KEY;
break;
case 'P': /* Esc O P == F1 on VT100/VT220/VT320/Mach
* console. */
retval = KEY_F(1);
break;
case 'Q': /* Esc O Q == F2 on VT100/VT220/VT320/Mach
* console. */
retval = KEY_F(2);
break;
case 'R': /* Esc O R == F3 on VT100/VT220/VT320/Mach
* console. */
retval = KEY_F(3);
break;
case 'S': /* Esc O S == F4 on VT100/VT220/VT320/Mach
* console. */
retval = KEY_F(4);
break;
case 'T': /* Esc O T == F5 on Mach console. */
retval = KEY_F(5);
break;
case 'U': /* Esc O U == F6 on Mach console. */
retval = KEY_F(6);
break;
case 'V': /* Esc O V == F7 on Mach console. */
retval = KEY_F(7);
break;
case 'W': /* Esc O W == F8 on Mach console. */
retval = KEY_F(8);
break;
case 'X': /* Esc O X == F9 on Mach console. */
retval = KEY_F(9);
break;
case 'Y': /* Esc O Y == F10 on Mach console. */
retval = KEY_F(10);
break;
case 'a': /* Esc O a == Ctrl-Up on rxvt. */
case 'b': /* Esc O b == Ctrl-Down on rxvt. */
case 'c': /* Esc O c == Ctrl-Right on rxvt. */
case 'd': /* Esc O d == Ctrl-Left on rxvt. */
retval = get_escape_seq_abcd(seq[1]);
break;
case 'j': /* Esc O j == '*' on numeric keypad with
* NumLock off on VT100/VT220/VT320/xterm/
* rxvt. */
retval = '*';
break;
case 'k': /* Esc O k == '+' on numeric keypad with
* NumLock off on VT100/VT220/VT320/xterm/
* rxvt. */
retval = '+';
break;
case 'l': /* Esc O l == ',' on numeric keypad with
* NumLock off on VT100/VT220/VT320/xterm/
* rxvt. */
retval = ',';
break;
case 'm': /* Esc O m == '-' on numeric keypad with
* NumLock off on VT100/VT220/VT320/xterm/
* rxvt. */
retval = '-';
break;
case 'n': /* Esc O n == Delete (.) on numeric keypad
* with NumLock off on VT100/VT220/VT320/
* xterm/rxvt. */
retval = NANO_DELETE_KEY;
break;
case 'o': /* Esc O o == '/' on numeric keypad with
* NumLock off on VT100/VT220/VT320/xterm/
* rxvt. */
retval = '/';
break;
case 'p': /* Esc O p == Insert (0) on numeric keypad
* with NumLock off on VT100/VT220/VT320/
* rxvt. */
retval = NANO_INSERTFILE_KEY;
break;
case 'q': /* Esc O q == End (1) on numeric keypad
* with NumLock off on VT100/VT220/VT320/
* rxvt. */
retval = NANO_END_KEY;
break;
case 'r': /* Esc O r == Down (2) on numeric keypad
* with NumLock off on VT100/VT220/VT320/
* rxvt. */
retval = NANO_NEXTLINE_KEY;
break;
case 's': /* Esc O s == PageDown (3) on numeric
* keypad with NumLock off on VT100/VT220/
* VT320/rxvt. */
retval = NANO_NEXTPAGE_KEY;
break;
case 't': /* Esc O t == Left (4) on numeric keypad
* with NumLock off on VT100/VT220/VT320/
* rxvt. */
retval = NANO_BACK_KEY;
break;
case 'u': /* Esc O u == Center (5) on numeric keypad
* with NumLock off on VT100/VT220/VT320/
* rxvt/Eterm. */
*ignore_seq = TRUE;
break;
case 'v': /* Esc O v == Right (6) on numeric keypad
* with NumLock off on VT100/VT220/VT320/
* rxvt. */
retval = NANO_FORWARD_KEY;
break;
case 'w': /* Esc O w == Home (7) on numeric keypad
* with NumLock off on VT100/VT220/VT320/
* rxvt. */
retval = NANO_HOME_KEY;
break;
case 'x': /* Esc O x == Up (8) on numeric keypad
* with NumLock off on VT100/VT220/VT320/
* rxvt. */
retval = NANO_PREVLINE_KEY;
break;
case 'y': /* Esc O y == PageUp (9) on numeric keypad
* with NumLock off on VT100/VT220/VT320/
* rxvt. */
retval = NANO_PREVPAGE_KEY;
break;
}
break;
case 'o':
switch (seq[1]) {
case 'a': /* Esc o a == Ctrl-Up on Eterm. */
case 'b': /* Esc o b == Ctrl-Down on Eterm. */
case 'c': /* Esc o c == Ctrl-Right on Eterm. */
case 'd': /* Esc o d == Ctrl-Left on Eterm. */
retval = get_escape_seq_abcd(seq[1]);
break;
}
break;
case '[':
switch (seq[1]) {
case '1':
if (seq_len >= 3) {
switch (seq[2]) {
case '1': /* Esc [ 1 1 ~ == F1 on rxvt/
* Eterm. */
retval = KEY_F(1);
break;
case '2': /* Esc [ 1 2 ~ == F2 on rxvt/
* Eterm. */
retval = KEY_F(2);
break;
case '3': /* Esc [ 1 3 ~ == F3 on rxvt/
* Eterm. */
retval = KEY_F(3);
break;
case '4': /* Esc [ 1 4 ~ == F4 on rxvt/
* Eterm. */
retval = KEY_F(4);
break;
case '5': /* Esc [ 1 5 ~ == F5 on xterm/
* rxvt/Eterm. */
retval = KEY_F(5);
break;
case '7': /* Esc [ 1 7 ~ == F6 on
* VT220/VT320/Linux console/
* xterm/rxvt/Eterm. */
retval = KEY_F(6);
break;
case '8': /* Esc [ 1 8 ~ == F7 on
* VT220/VT320/Linux console/
* xterm/rxvt/Eterm. */
retval = KEY_F(7);
break;
case '9': /* Esc [ 1 9 ~ == F8 on
* VT220/VT320/Linux console/
* xterm/rxvt/Eterm. */
retval = KEY_F(8);
break;
case ';':
if (seq_len >= 4) {
switch (seq[3]) {
case '2':
if (seq_len >= 5) {
switch (seq[4]) {
case 'A': /* Esc [ 1 ; 2 A == Shift-Up on
* xterm. */
case 'B': /* Esc [ 1 ; 2 B == Shift-Down on
* xterm. */
case 'C': /* Esc [ 1 ; 2 C == Shift-Right on
* xterm. */
case 'D': /* Esc [ 1 ; 2 D == Shift-Left on
* xterm. */
retval = get_escape_seq_abcd(seq[4]);
break;
}
}
break;
case '5':
if (seq_len >= 5) {
switch (seq[4]) {
case 'A': /* Esc [ 1 ; 5 A == Ctrl-Up on
* xterm. */
case 'B': /* Esc [ 1 ; 5 B == Ctrl-Down on
* xterm. */
case 'C': /* Esc [ 1 ; 5 C == Ctrl-Right on
* xterm. */
case 'D': /* Esc [ 1 ; 5 D == Ctrl-Left on
* xterm. */
retval = get_escape_seq_abcd(seq[4]);
break;
}
}
break;
}
}
break;
default: /* Esc [ 1 ~ == Home on
* VT320/Linux console. */
retval = NANO_HOME_KEY;
break;
}
}
break;
case '2':
if (seq_len >= 3) {
switch (seq[2]) {
case '0': /* Esc [ 2 0 ~ == F9 on
* VT220/VT320/Linux console/
* xterm/rxvt/Eterm. */
retval = KEY_F(9);
break;
case '1': /* Esc [ 2 1 ~ == F10 on
* VT220/VT320/Linux console/
* xterm/rxvt/Eterm. */
retval = KEY_F(10);
break;
case '3': /* Esc [ 2 3 ~ == F11 on
* VT220/VT320/Linux console/
* xterm/rxvt/Eterm. */
retval = KEY_F(11);
break;
case '4': /* Esc [ 2 4 ~ == F12 on
* VT220/VT320/Linux console/
* xterm/rxvt/Eterm. */
retval = KEY_F(12);
break;
case '5': /* Esc [ 2 5 ~ == F13 on
* VT220/VT320/Linux console/
* rxvt/Eterm. */
retval = KEY_F(13);
break;
case '6': /* Esc [ 2 6 ~ == F14 on
* VT220/VT320/Linux console/
* rxvt/Eterm. */
retval = KEY_F(14);
break;
case '8': /* Esc [ 2 8 ~ == F15 on
* VT220/VT320/Linux console/
* rxvt/Eterm. */
retval = KEY_F(15);
break;
case '9': /* Esc [ 2 9 ~ == F16 on
* VT220/VT320/Linux console/
* rxvt/Eterm. */
retval = KEY_F(16);
break;
default: /* Esc [ 2 ~ == Insert on
* VT220/VT320/Linux console/
* xterm. */
retval = NANO_INSERTFILE_KEY;
break;
}
}
break;
case '3': /* Esc [ 3 ~ == Delete on VT220/VT320/
* Linux console/xterm. */
retval = NANO_DELETE_KEY;
break;
case '4': /* Esc [ 4 ~ == End on VT220/VT320/Linux
* console/xterm. */
retval = NANO_END_KEY;
break;
case '5': /* Esc [ 5 ~ == PageUp on VT220/VT320/
* Linux console/xterm; Esc [ 5 ^ ==
* PageUp on Eterm. */
retval = NANO_PREVPAGE_KEY;
break;
case '6': /* Esc [ 6 ~ == PageDown on VT220/VT320/
* Linux console/xterm; Esc [ 6 ^ ==
* PageDown on Eterm. */
retval = NANO_NEXTPAGE_KEY;
break;
case '7': /* Esc [ 7 ~ == Home on rxvt. */
retval = NANO_HOME_KEY;
break;
case '8': /* Esc [ 8 ~ == End on rxvt. */
retval = NANO_END_KEY;
break;
case '9': /* Esc [ 9 == Delete on Mach console. */
retval = NANO_DELETE_KEY;
break;
case '@': /* Esc [ @ == Insert on Mach console. */
retval = NANO_INSERTFILE_KEY;
break;
case 'A': /* Esc [ A == Up on ANSI/VT220/Linux
* console/FreeBSD console/Mach console/
* rxvt/Eterm. */
case 'B': /* Esc [ B == Down on ANSI/VT220/Linux
* console/FreeBSD console/Mach console/
* rxvt/Eterm. */
case 'C': /* Esc [ C == Right on ANSI/VT220/Linux
* console/FreeBSD console/Mach console/
* rxvt/Eterm. */
case 'D': /* Esc [ D == Left on ANSI/VT220/Linux
* console/FreeBSD console/Mach console/
* rxvt/Eterm. */
retval = get_escape_seq_abcd(seq[1]);
break;
case 'E': /* Esc [ E == Center (5) on numeric keypad
* with NumLock off on FreeBSD console. */
*ignore_seq = TRUE;
break;
case 'F': /* Esc [ F == End on FreeBSD
* console/Eterm. */
retval = NANO_END_KEY;
break;
case 'G': /* Esc [ G == PageDown on FreeBSD
* console. */
retval = NANO_NEXTPAGE_KEY;
break;
case 'H': /* Esc [ H == Home on ANSI/VT220/FreeBSD
* console/Mach console/Eterm. */
retval = NANO_HOME_KEY;
break;
case 'I': /* Esc [ I == PageUp on FreeBSD
* console. */
retval = NANO_PREVPAGE_KEY;
break;
case 'L': /* Esc [ L == Insert on ANSI/FreeBSD
* console. */
retval = NANO_INSERTFILE_KEY;
break;
case 'M': /* Esc [ M == F1 on FreeBSD console. */
retval = KEY_F(1);
break;
case 'N': /* Esc [ N == F2 on FreeBSD console. */
retval = KEY_F(2);
break;
case 'O':
if (seq_len >= 3) {
switch (seq[2]) {
case 'P': /* Esc [ O P == F1 on
* xterm. */
retval = KEY_F(1);
break;
case 'Q': /* Esc [ O Q == F2 on
* xterm. */
retval = KEY_F(2);
break;
case 'R': /* Esc [ O R == F3 on
* xterm. */
retval = KEY_F(3);
break;
case 'S': /* Esc [ O S == F4 on
* xterm. */
retval = KEY_F(4);
break;
}
} else
/* Esc [ O == F3 on FreeBSD console. */
retval = KEY_F(3);
break;
case 'P': /* Esc [ P == F4 on FreeBSD console. */
retval = KEY_F(4);
break;
case 'Q': /* Esc [ Q == F5 on FreeBSD console. */
retval = KEY_F(5);
break;
case 'R': /* Esc [ R == F6 on FreeBSD console. */
retval = KEY_F(6);
break;
case 'S': /* Esc [ S == F7 on FreeBSD console. */
retval = KEY_F(7);
break;
case 'T': /* Esc [ T == F8 on FreeBSD console. */
retval = KEY_F(8);
break;
case 'U': /* Esc [ U == PageDown on Mach console. */
retval = NANO_NEXTPAGE_KEY;
break;
case 'V': /* Esc [ V == PageUp on Mach console. */
retval = NANO_PREVPAGE_KEY;
break;
case 'W': /* Esc [ W == F11 on FreeBSD console. */
retval = KEY_F(11);
break;
case 'X': /* Esc [ X == F12 on FreeBSD console. */
retval = KEY_F(12);
break;
case 'Y': /* Esc [ Y == End on Mach console. */
retval = NANO_END_KEY;
break;
case 'Z': /* Esc [ Z == F14 on FreeBSD console. */
retval = KEY_F(14);
break;
case 'a': /* Esc [ a == Shift-Up on rxvt/Eterm. */
case 'b': /* Esc [ b == Shift-Down on rxvt/Eterm. */
case 'c': /* Esc [ c == Shift-Right on rxvt/
* Eterm. */
case 'd': /* Esc [ d == Shift-Left on rxvt/Eterm. */
retval = get_escape_seq_abcd(seq[1]);
break;
case '[':
if (seq_len >= 3) {
switch (seq[2]) {
case 'A': /* Esc [ [ A == F1 on Linux
* console. */
retval = KEY_F(1);
break;
case 'B': /* Esc [ [ B == F2 on Linux
* console. */
retval = KEY_F(2);
break;
case 'C': /* Esc [ [ C == F3 on Linux
* console. */
retval = KEY_F(3);
break;
case 'D': /* Esc [ [ D == F4 on Linux
* console. */
retval = KEY_F(4);
break;
case 'E': /* Esc [ [ E == F5 on Linux
* console. */
retval = KEY_F(5);
break;
}
}
break;
}
break;
}
}
#ifdef DEBUG
fprintf(stderr, "get_escape_seq_kbinput(): retval = %d, ignore_seq = %d\n", retval, (int)*ignore_seq);
#endif
return retval;
}
/* Return the equivalent arrow key value for the case-insensitive
* letters A (up), B (down), C (right), and D (left). These are common
* to many escape sequences. */
int get_escape_seq_abcd(int kbinput)
{
switch (tolower(kbinput)) {
case 'a':
return NANO_PREVLINE_KEY;
case 'b':
return NANO_NEXTLINE_KEY;
case 'c':
return NANO_FORWARD_KEY;
case 'd':
return NANO_BACK_KEY;
default:
return ERR;
}
}
/* Translate a byte sequence: turn a three-digit decimal number from
* 000 to 255 into its corresponding byte value. */
int get_byte_kbinput(int kbinput
#ifndef NANO_TINY
, bool reset
#endif
)
{
static int byte_digits = 0, byte = 0;
int retval = ERR;
#ifndef NANO_TINY
if (reset) {
byte_digits = 0;
byte = 0;
return ERR;
}
#endif
/* Increment the byte digit counter. */
byte_digits++;
switch (byte_digits) {
case 1:
/* One digit: reset the byte sequence holder and add the
* digit we got to the 100's position of the byte sequence
* holder. */
byte = 0;
if ('0' <= kbinput && kbinput <= '2')
byte += (kbinput - '0') * 100;
else
/* If the character we got isn't a decimal digit, or if
* it is and it would put the byte sequence out of byte
* range, save it as the result. */
retval = kbinput;
break;
case 2:
/* Two digits: add the digit we got to the 10's position of
* the byte sequence holder. */
if (('0' <= kbinput && kbinput <= '5') || (byte < 200 &&
'6' <= kbinput && kbinput <= '9'))
byte += (kbinput - '0') * 10;
else
/* If the character we got isn't a decimal digit, or if
* it is and it would put the byte sequence out of byte
* range, save it as the result. */
retval = kbinput;
break;
case 3:
/* Three digits: add the digit we got to the 1's position of
* the byte sequence holder, and save the corresponding word
* value as the result. */
if (('0' <= kbinput && kbinput <= '5') || (byte < 250 &&
'6' <= kbinput && kbinput <= '9')) {
byte += (kbinput - '0');
retval = byte;
} else
/* If the character we got isn't a decimal digit, or if
* it is and it would put the byte sequence out of word
* range, save it as the result. */
retval = kbinput;
break;
default:
/* More than three digits: save the character we got as the
* result. */
retval = kbinput;
break;
}
/* If we have a result, reset the byte digit counter and the byte
* sequence holder. */
if (retval != ERR) {
byte_digits = 0;
byte = 0;
}
#ifdef DEBUG
fprintf(stderr, "get_byte_kbinput(): kbinput = %d, byte_digits = %d, byte = %d, retval = %d\n", kbinput, byte_digits, byte, retval);
#endif
return retval;
}
/* Translate a Unicode sequence: turn a six-digit hexadecimal number
* from 000000 to 10FFFF (case-insensitive) into its corresponding
* multibyte value. */
long get_unicode_kbinput(int kbinput
#ifndef NANO_TINY
, bool reset
#endif
)
{
static int uni_digits = 0;
static long uni = 0;
long retval = ERR;
#ifndef NANO_TINY
if (reset) {
uni_digits = 0;
uni = 0;
return ERR;
}
#endif
/* Increment the Unicode digit counter. */
uni_digits++;
switch (uni_digits) {
case 1:
/* One digit: reset the Unicode sequence holder and add the
* digit we got to the 0x100000's position of the Unicode
* sequence holder. */
uni = 0;
if ('0' <= kbinput && kbinput <= '1')
uni += (kbinput - '0') * 0x100000;
else
/* If the character we got isn't a hexadecimal digit, or
* if it is and it would put the Unicode sequence out of
* valid range, save it as the result. */
retval = kbinput;
break;
case 2:
/* Two digits: add the digit we got to the 0x10000's
* position of the Unicode sequence holder. */
if ('0' == kbinput || (uni < 0x100000 && '1' <= kbinput &&
kbinput <= '9'))
uni += (kbinput - '0') * 0x10000;
else if (uni < 0x100000 && 'a' <= tolower(kbinput) &&
tolower(kbinput) <= 'f')
uni += (tolower(kbinput) + 10 - 'a') * 0x10000;
else
/* If the character we got isn't a hexadecimal digit, or
* if it is and it would put the Unicode sequence out of
* valid range, save it as the result. */
retval = kbinput;
break;
case 3:
/* Three digits: add the digit we got to the 0x1000's
* position of the Unicode sequence holder. */
if ('0' <= kbinput && kbinput <= '9')
uni += (kbinput - '0') * 0x1000;
else if ('a' <= tolower(kbinput) && tolower(kbinput) <= 'f')
uni += (tolower(kbinput) + 10 - 'a') * 0x1000;
else
/* If the character we got isn't a hexadecimal digit, or
* if it is and it would put the Unicode sequence out of
* valid range, save it as the result. */
retval = kbinput;
break;
case 4:
/* Four digits: add the digit we got to the 0x100's position
* of the Unicode sequence holder. */
if ('0' <= kbinput && kbinput <= '9')
uni += (kbinput - '0') * 0x100;
else if ('a' <= tolower(kbinput) && tolower(kbinput) <= 'f')
uni += (tolower(kbinput) + 10 - 'a') * 0x100;
else
/* If the character we got isn't a hexadecimal digit, or
* if it is and it would put the Unicode sequence out of
* valid range, save it as the result. */
retval = kbinput;
break;
case 5:
/* Five digits: add the digit we got to the 0x10's position
* of the Unicode sequence holder. */
if ('0' <= kbinput && kbinput <= '9')
uni += (kbinput - '0') * 0x10;
else if ('a' <= tolower(kbinput) && tolower(kbinput) <= 'f')
uni += (tolower(kbinput) + 10 - 'a') * 0x10;
else
/* If the character we got isn't a hexadecimal digit, or
* if it is and it would put the Unicode sequence out of
* valid range, save it as the result. */
retval = kbinput;
break;
case 6:
/* Six digits: add the digit we got to the 1's position of
* the Unicode sequence holder, and save the corresponding
* Unicode value as the result. */
if ('0' <= kbinput && kbinput <= '9') {
uni += (kbinput - '0');
retval = uni;
} else if ('a' <= tolower(kbinput) && tolower(kbinput) <=
'f') {
uni += (tolower(kbinput) + 10 - 'a');
retval = uni;
} else
/* If the character we got isn't a hexadecimal digit, or
* if it is and it would put the Unicode sequence out of
* valid range, save it as the result. */
retval = kbinput;
break;
default:
/* More than six digits: save the character we got as the
* result. */
retval = kbinput;
break;
}
/* If we have a result, reset the Unicode digit counter and the
* Unicode sequence holder. */
if (retval != ERR) {
uni_digits = 0;
uni = 0;
}
#ifdef DEBUG
fprintf(stderr, "get_unicode_kbinput(): kbinput = %d, uni_digits = %d, uni = %ld, retval = %ld\n", kbinput, uni_digits, uni, retval);
#endif
return retval;
}
/* Translate a control character sequence: turn an ASCII non-control
* character into its corresponding control character. */
int get_control_kbinput(int kbinput)
{
int retval;
/* Ctrl-2 (Ctrl-Space, Ctrl-@, Ctrl-`) */
if (kbinput == '2' || kbinput == ' ' || kbinput == '@' ||
kbinput == '`')
retval = NANO_CONTROL_SPACE;
/* Ctrl-3 (Ctrl-[, Esc) to Ctrl-7 (Ctrl-_) */
else if ('3' <= kbinput && kbinput <= '7')
retval = kbinput - 24;
/* Ctrl-8 (Ctrl-?) */
else if (kbinput == '8' || kbinput == '?')
retval = NANO_CONTROL_8;
/* Ctrl-A to Ctrl-_ */
else if ('A' <= kbinput && kbinput <= '_')
retval = kbinput - 64;
/* Ctrl-a to Ctrl-~ */
else if ('a' <= kbinput && kbinput <= '~')
retval = kbinput - 96;
else
retval = kbinput;
#ifdef DEBUG
fprintf(stderr, "get_control_kbinput(): kbinput = %d, retval = %d\n", kbinput, retval);
#endif
return retval;
}
/* Put the output-formatted characters in output back into the default
* keystroke buffer, so that they can be parsed and displayed as output
* again. */
void unparse_kbinput(char *output, size_t output_len)
{
int *input;
size_t i;
if (output_len == 0)
return;
input = (int *)nmalloc(output_len * sizeof(int));
for (i = 0; i < output_len; i++)
input[i] = (int)output[i];
unget_input(input, output_len);
free(input);
}
/* Read in a stream of characters verbatim, and return the length of the
* string in kbinput_len. Assume nodelay(win) is FALSE. */
int *get_verbatim_kbinput(WINDOW *win, size_t *kbinput_len)
{
int *retval;
/* Turn off flow control characters if necessary so that we can type
* them in verbatim, and turn the keypad off if necessary so that we
* don't get extended keypad values. */
if (ISSET(PRESERVE))
disable_flow_control();
if (!ISSET(REBIND_KEYPAD))
keypad(win, FALSE);
/* Read in a stream of characters and interpret it if possible. */
retval = parse_verbatim_kbinput(win, kbinput_len);
/* Turn flow control characters back on if necessary and turn the
* keypad back on if necessary now that we're done. */
if (ISSET(PRESERVE))
enable_flow_control();
if (!ISSET(REBIND_KEYPAD))
keypad(win, TRUE);
return retval;
}
/* Read in a stream of all available characters, and return the length
* of the string in kbinput_len. Translate the first few characters of
* the input into the corresponding multibyte value if possible. After
* that, leave the input as-is. */
int *parse_verbatim_kbinput(WINDOW *win, size_t *kbinput_len)
{
int *kbinput, *retval;
long uni;
/* Read in the first keystroke. */
while ((kbinput = get_input(win, 1)) == NULL);
/* Check whether the first keystroke is a hexadecimal digit. */
uni = get_unicode_kbinput(*kbinput
#ifndef NANO_TINY
, FALSE
#endif
);
/* If the first keystroke isn't a hexadecimal digit, put back the
* first keystroke. */
if (uni != ERR)
unget_input(kbinput, 1);
/* Otherwise, read in keystrokes until we have a complete word
* sequence, and put back the corresponding word value. */
else {
char *uni_mb;
int uni_mb_len, *seq, i;
while (uni == ERR) {
while ((kbinput = get_input(win, 1)) == NULL);
uni = get_unicode_kbinput(*kbinput
#ifndef NANO_TINY
, FALSE
#endif
);
}
/* Put back the multibyte equivalent of the Unicode value. */
uni_mb = make_mbchar(uni, &uni_mb_len);
seq = (int *)nmalloc(uni_mb_len * sizeof(int));
for (i = 0; i < uni_mb_len; i++)
seq[i] = (unsigned char)uni_mb[i];
unget_input(seq, uni_mb_len);
free(seq);
free(uni_mb);
}
/* Get the complete sequence, and save the characters in it as the
* result. */
*kbinput_len = get_key_buffer_len();
retval = get_input(NULL, *kbinput_len);
return retval;
}
#ifndef DISABLE_MOUSE
/* Check for a mouse event, and if one's taken place, save the
* coordinates where it took place in mouse_x and mouse_y. After that,
* assuming allow_shortcuts is FALSE, if the shortcut list on the
* bottom two lines of the screen is visible and the mouse event took
* place on it, figure out which shortcut was clicked and put back the
* equivalent keystroke(s). Return FALSE if no keystrokes were
* put back, or TRUE if at least one was. Assume that KEY_MOUSE has
* already been read in. */
bool get_mouseinput(int *mouse_x, int *mouse_y, bool allow_shortcuts)
{
MEVENT mevent;
*mouse_x = -1;
*mouse_y = -1;
/* First, get the actual mouse event. */
if (getmouse(&mevent) == ERR)
return FALSE;
/* Save the screen coordinates where the mouse event took place. */
*mouse_x = mevent.x;
*mouse_y = mevent.y;
/* If we're allowing shortcuts, the current shortcut list is being
* displayed on the last two lines of the screen, and the mouse
* event took place inside it, we need to figure out which shortcut
* was clicked and put back the equivalent keystroke(s) for it. */
if (allow_shortcuts && !ISSET(NO_HELP) && wenclose(bottomwin,
*mouse_y, *mouse_x)) {
int i, j;
size_t currslen;
/* The number of shortcuts in the current shortcut list. */
const shortcut *s = currshortcut;
/* The actual shortcut we clicked on, starting at the first
* one in the current shortcut list. */
/* Get the shortcut lists' length. */
if (currshortcut == main_list)
currslen = MAIN_VISIBLE;
else {
currslen = length_of_list(currshortcut);
/* We don't show any more shortcuts than the main list
* does. */
if (currslen > MAIN_VISIBLE)
currslen = MAIN_VISIBLE;
}
/* Calculate the width of all of the shortcuts in the list
* except for the last two, which are longer by (COLS % i)
* columns so as to not waste space. */
if (currslen < 2)
i = COLS / (MAIN_VISIBLE / 2);
else
i = COLS / ((currslen / 2) + (currslen % 2));
/* Calculate the y-coordinate relative to the beginning of
* the shortcut list in bottomwin, i.e, with the sizes of
* topwin, edit, and the first line of bottomwin subtracted
* out, and set j to it. */
j = *mouse_y - (2 - no_more_space()) - editwinrows - 1;
/* If we're on the statusbar, don't do anything. */
if (j < 0)
return FALSE;
/* Calculate the x-coordinate relative to the beginning of the
* shortcut list in bottomwin, and add it to j. j should now be
* the index in the shortcut list of the shortcut we clicked. */
j = (*mouse_x / i) * 2 + j;
/* Adjust j if we clicked in the last two shortcuts. */
if ((j >= currslen) && (*mouse_x % i < COLS % i))
j -= 2;
/* If we're beyond the last shortcut, don't do anything. */
if (j >= currslen)
return FALSE;
/* Go through the shortcut list to determine which shortcut was
* clicked. */
for (; j > 0; j--)
s = s->next;
/* And put back the equivalent key. Assume that each shortcut
* has, at the very least, an equivalent control key, an
* equivalent primary meta key sequence, or both. */
if (s->ctrlval != NANO_NO_KEY) {
unget_kbinput(s->ctrlval, FALSE, FALSE);
return TRUE;
} else if (s->metaval != NANO_NO_KEY) {
unget_kbinput(s->metaval, TRUE, FALSE);
return TRUE;
}
}
return FALSE;
}
#endif /* !DISABLE_MOUSE */
/* Return the shortcut corresponding to the values of kbinput (the key
* itself), meta_key (whether the key is a meta sequence), and func_key
* (whether the key is a function key), if any. The shortcut will be
* the first one in the list (control key, meta key sequence, function
* key, other meta key sequence) for the corresponding function. For
* example, passing in a meta key sequence that corresponds to a
* function with a control key, a function key, and a meta key sequence
* will return the control key corresponding to that function. */
const shortcut *get_shortcut(const shortcut *s_list, int *kbinput, bool
*meta_key, bool *func_key)
{
const shortcut *s = s_list;
size_t slen = length_of_list(s_list);
#ifdef DEBUG
fprintf(stderr, "get_shortcut(): kbinput = %d, meta_key = %d, func_key = %d\n", *kbinput, (int)*meta_key, (int)*func_key);
#endif
/* Check for shortcuts. */
for (; slen > 0; slen--) {
/* We've found a shortcut if:
*
* 1. The key exists.
* 2. The key is a control key in the shortcut list.
* 3. meta_key is TRUE and the key is the primary or
* miscellaneous meta sequence in the shortcut list.
* 4. func_key is TRUE and the key is a function key in the
* shortcut list. */
if (*kbinput != NANO_NO_KEY && (*kbinput == s->ctrlval ||
(*meta_key == TRUE && (*kbinput == s->metaval ||
*kbinput == s->miscval)) || (*func_key == TRUE &&
*kbinput == s->funcval))) {
break;
}
s = s->next;
}
/* Translate the shortcut to either its control key or its meta key
* equivalent. Assume that the shortcut has an equivalent control
* key, an equivalent primary meta key sequence, or both. */
if (slen > 0) {
if (s->ctrlval != NANO_NO_KEY) {
*meta_key = FALSE;
*func_key = FALSE;
*kbinput = s->ctrlval;
return s;
} else if (s->metaval != NANO_NO_KEY) {
*meta_key = TRUE;
*func_key = FALSE;
*kbinput = s->metaval;
return s;
}
}
return NULL;
}
#ifndef NANO_TINY
/* Return the global toggle corresponding to the values of kbinput (the
* key itself) and meta_key (whether the key is a meta sequence), if
* any. */
const toggle *get_toggle(int kbinput, bool meta_key)
{
const toggle *t = toggles;
#ifdef DEBUG
fprintf(stderr, "get_toggle(): kbinput = %d, meta_key = %d\n", kbinput, (int)meta_key);
#endif
/* Check for toggles. */
for (; t != NULL; t = t->next) {
/* We've found a toggle if meta_key is TRUE and the key is in
* the meta key toggle list. */
if (meta_key && kbinput == t->val)
break;
}
return t;
}
#endif /* !NANO_TINY */
/* Move to (x, y) in win, and display a line of n spaces with the
* current attributes. */
void blank_line(WINDOW *win, int y, int x, int n)
{
wmove(win, y, x);
for (; n > 0; n--)
waddch(win, ' ');
}
/* Blank the first line of the top portion of the window. */
void blank_titlebar(void)
{
blank_line(topwin, 0, 0, COLS);
}
/* If the MORE_SPACE flag isn't set, blank the second line of the top
* portion of the window. */
void blank_topbar(void)
{
if (!ISSET(MORE_SPACE))
blank_line(topwin, 1, 0, COLS);
}
/* Blank all the lines of the middle portion of the window, i.e, the
* edit window. */
void blank_edit(void)
{
int i;
for (i = 0; i < editwinrows; i++)
blank_line(edit, i, 0, COLS);
}
/* Blank the first line of the bottom portion of the window. */
void blank_statusbar(void)
{
blank_line(bottomwin, 0, 0, COLS);
}
/* If the NO_HELP flag isn't set, blank the last two lines of the bottom
* portion of the window. */
void blank_bottombars(void)
{
if (!ISSET(NO_HELP)) {
blank_line(bottomwin, 1, 0, COLS);
blank_line(bottomwin, 2, 0, COLS);
}
}
/* Check if the number of keystrokes needed to blank the statusbar has
* been pressed. If so, blank the statusbar, unless constant cursor
* position display is on. */
void check_statusblank(void)
{
if (statusblank > 0)
statusblank--;
if (statusblank == 0 && !ISSET(CONST_UPDATE)) {
blank_statusbar();
wnoutrefresh(bottomwin);
reset_cursor();
wnoutrefresh(edit);
}
}
/* Convert buf into a string that can be displayed on screen. The
* caller wants to display buf starting with column start_col, and
* extending for at most len columns. start_col is zero-based. len is
* one-based, so len == 0 means you get "" returned. The returned
* string is dynamically allocated, and should be freed. If dollars is
* TRUE, the caller might put "$" at the beginning or end of the line if
* it's too long. */
char *display_string(const char *buf, size_t start_col, size_t len, bool
dollars)
{
size_t start_index;
/* Index in buf of the first character shown. */
size_t column;
/* Screen column that start_index corresponds to. */
size_t alloc_len;
/* The length of memory allocated for converted. */
char *converted;
/* The string we return. */
size_t index;
/* Current position in converted. */
char *buf_mb;
int buf_mb_len;
/* If dollars is TRUE, make room for the "$" at the end of the
* line. */
if (dollars && len > 0 && strlenpt(buf) > start_col + len)
len--;
if (len == 0)
return mallocstrcpy(NULL, "");
buf_mb = charalloc(mb_cur_max());
start_index = actual_x(buf, start_col);
column = strnlenpt(buf, start_index);
assert(column <= start_col);
/* Make sure there's enough room for the initial character, whether
* it's a multibyte control character, a non-control multibyte
* character, a tab character, or a null terminator. Rationale:
*
* multibyte control character followed by a null terminator:
* 1 byte ('^') + mb_cur_max() bytes + 1 byte ('\0')
* multibyte non-control character followed by a null terminator:
* mb_cur_max() bytes + 1 byte ('\0')
* tab character followed by a null terminator:
* mb_cur_max() bytes + (tabsize - 1) bytes + 1 byte ('\0')
*
* Since tabsize has a minimum value of 1, it can substitute for 1
* byte above. */
alloc_len = (mb_cur_max() + tabsize + 1) * MAX_BUF_SIZE;
converted = charalloc(alloc_len);
index = 0;
if (buf[start_index] != '\t' && (column < start_col || (dollars &&
column > 0))) {
/* We don't display all of buf[start_index] since it starts to
* the left of the screen. */
buf_mb_len = parse_mbchar(buf + start_index, buf_mb, NULL);
if (is_cntrl_mbchar(buf_mb)) {
if (column < start_col) {
char *ctrl_buf_mb = charalloc(mb_cur_max());
int ctrl_buf_mb_len, i;
ctrl_buf_mb = control_mbrep(buf_mb, ctrl_buf_mb,
&ctrl_buf_mb_len);
for (i = 0; i < ctrl_buf_mb_len; i++)
converted[index++] = ctrl_buf_mb[i];
start_col += mbwidth(ctrl_buf_mb);
free(ctrl_buf_mb);
start_index += buf_mb_len;
}
}
#ifdef ENABLE_UTF8
else if (using_utf8() && mbwidth(buf_mb) > 1) {
converted[index++] = ' ';
start_col++;
start_index += buf_mb_len;
}
#endif
}
while (buf[start_index] != '\0') {
buf_mb_len = parse_mbchar(buf + start_index, buf_mb, NULL);
/* Make sure there's enough room for the next character, whether
* it's a multibyte control character, a non-control multibyte
* character, a tab character, or a null terminator. */
if (index + mb_cur_max() + tabsize + 1 >= alloc_len - 1) {
alloc_len += (mb_cur_max() + tabsize + 1) * MAX_BUF_SIZE;
converted = charealloc(converted, alloc_len);
}
/* If buf contains a tab character, interpret it. */
if (*buf_mb == '\t') {
#if !defined(NANO_TINY) && defined(ENABLE_NANORC)
if (ISSET(WHITESPACE_DISPLAY)) {
int i;
for (i = 0; i < whitespace_len[0]; i++)
converted[index++] = whitespace[i];
} else
#endif
converted[index++] = ' ';
start_col++;
while (start_col % tabsize != 0) {
converted[index++] = ' ';
start_col++;
}
/* If buf contains a control character, interpret it. If buf
* contains an invalid multibyte control character, display it
* as such.*/
} else if (is_cntrl_mbchar(buf_mb)) {
char *ctrl_buf_mb = charalloc(mb_cur_max());
int ctrl_buf_mb_len, i;
converted[index++] = '^';
start_col++;
ctrl_buf_mb = control_mbrep(buf_mb, ctrl_buf_mb,
&ctrl_buf_mb_len);
for (i = 0; i < ctrl_buf_mb_len; i++)
converted[index++] = ctrl_buf_mb[i];
start_col += mbwidth(ctrl_buf_mb);
free(ctrl_buf_mb);
/* If buf contains a space character, interpret it. */
} else if (*buf_mb == ' ') {
#if !defined(NANO_TINY) && defined(ENABLE_NANORC)
if (ISSET(WHITESPACE_DISPLAY)) {
int i;
for (i = whitespace_len[0]; i < whitespace_len[0] +
whitespace_len[1]; i++)
converted[index++] = whitespace[i];
} else
#endif
converted[index++] = ' ';
start_col++;
/* If buf contains a non-control character, interpret it. If
* buf contains an invalid multibyte non-control character,
* display it as such. */
} else {
char *nctrl_buf_mb = charalloc(mb_cur_max());
int nctrl_buf_mb_len, i;
nctrl_buf_mb = mbrep(buf_mb, nctrl_buf_mb,
&nctrl_buf_mb_len);
for (i = 0; i < nctrl_buf_mb_len; i++)
converted[index++] = nctrl_buf_mb[i];
start_col += mbwidth(nctrl_buf_mb);
free(nctrl_buf_mb);
}
start_index += buf_mb_len;
}
free(buf_mb);
assert(alloc_len >= index + 1);
/* Null terminate converted. */
converted[index] = '\0';
/* Make sure converted takes up no more than len columns. */
index = actual_x(converted, len);
null_at(&converted, index);
return converted;
}
/* Display the path specified in path on the titlebar, along with the
* current version of nano and whether the current file has been
* modified. If path is NULL, assume we're in normal editing mode and
* display the current filename instead. Otherwise, assume we're in the
* file browser, and don't display whether the current file has been
* modified. */
void titlebar(const char *path)
{
int space = COLS;
/* The space we have available for display. */
size_t verlen = strlenpt(PACKAGE_STRING) + 1;
/* The length of the version message in columns, plus one for
* padding. */
const char *prefix;
/* "DIR:", "File:", or "New Buffer". Goes before filename. */
size_t prefixlen;
/* The length of the prefix in columns, plus one for padding. */
const char *state;
/* "Modified", "View", or "". Shows the state of this
* buffer. */
size_t statelen = 0;
/* The length of the state in columns, or the length of
* "Modified" if the state is blank. */
char *exppath = NULL;
/* The file name, expanded for display. */
bool newfie = FALSE;
/* Do we say "New Buffer"? */
bool dots = FALSE;
/* Do we put an ellipsis before the path? */
assert(path != NULL || openfile->filename != NULL);
wattron(topwin, reverse_attr);
blank_titlebar();
/* space has to be at least 4: two spaces before the version message,
* at least one character of the version message, and one space
* after the version message. */
if (space < 4)
space = 0;
else {
/* Limit verlen to 1/3 the length of the screen in columns,
* minus three columns for spaces. */
if (verlen > (COLS / 3) - 3)
verlen = (COLS / 3) - 3;
}
if (space >= 4) {
/* Add a space after the version message, and account for both
* it and the two spaces before it. */
mvwaddnstr(topwin, 0, 2, PACKAGE_STRING,
actual_x(PACKAGE_STRING, verlen));
verlen += 3;
/* Account for the full length of the version message. */
space -= verlen;
}
#ifndef DISABLE_BROWSER
/* Don't display the state if we're in the file browser. */
if (path != NULL)
state = "";
else
#endif
state = openfile->modified ? _("Modified") : ISSET(VIEW_MODE) ?
_("View") : "";
statelen = strlenpt((state[0] != '\0') ? state : _("Modified"));
/* If possible, add a space before state. */
if (space > 0 && statelen < space)
statelen++;
else
goto the_end;
#ifndef DISABLE_BROWSER
/* path should be a directory if we're in the file browser. */
if (path != NULL)
prefix = _("DIR:");
else
#endif
if (openfile->filename[0] == '\0') {
prefix = _("New Buffer");
newfie = TRUE;
} else
prefix = _("File:");
prefixlen = strnlenpt(prefix, space - statelen) + 1;
/* If newfie is FALSE, add a space after prefix. */
if (!newfie && prefixlen + statelen < space)
prefixlen++;
/* If we're not in the file browser, path should be the current
* filename. */
if (path == NULL)
path = openfile->filename;
/* Account for the full lengths of the prefix and the state. */
if (space >= prefixlen + statelen)
space -= prefixlen + statelen;
else
space = 0;
/* space is now the room we have for the filename. */
if (!newfie) {
size_t lenpt = strlenpt(path), start_col;
dots = (lenpt >= space);
if (dots) {
start_col = lenpt - space + 3;
space -= 3;
} else
start_col = 0;
exppath = display_string(path, start_col, space, FALSE);
}
if (!dots) {
size_t exppathlen = newfie ? 0 : strlenpt(exppath);
/* The length of the expanded filename. */
/* There is room for the whole filename, so we center it. */
mvwaddnstr(topwin, 0, verlen + ((space - exppathlen) / 3),
prefix, actual_x(prefix, prefixlen));
if (!newfie) {
waddch(topwin, ' ');
waddstr(topwin, exppath);
}
} else {
/* We will say something like "File: ...ename". */
mvwaddnstr(topwin, 0, verlen - 1, prefix, actual_x(prefix,
prefixlen));
if (space <= -3 || newfie)
goto the_end;
waddch(topwin, ' ');
waddnstr(topwin, "...", space + 3);
if (space <= 0)
goto the_end;
waddstr(topwin, exppath);
}
the_end:
free(exppath);
if (state[0] != '\0') {
if (statelen >= COLS - 1)
mvwaddnstr(topwin, 0, 0, state, actual_x(state, COLS));
else {
assert(COLS - statelen - 1 >= 0);
mvwaddnstr(topwin, 0, COLS - statelen - 1, state,
actual_x(state, statelen));
}
}
wattroff(topwin, reverse_attr);
wnoutrefresh(topwin);
reset_cursor();
wnoutrefresh(edit);
}
/* Mark the current file as modified if it isn't already, and then
* update the titlebar to display the file's new status. */
void set_modified(void)
{
if (!openfile->modified) {
openfile->modified = TRUE;
titlebar(NULL);
}
}
/* Display a message on the statusbar, and set disable_cursorpos to
* TRUE, so that the message won't be immediately overwritten if
* constant cursor position display is on. */
void statusbar(const char *msg, ...)
{
va_list ap;
char *bar, *foo;
size_t start_x, foo_len;
#if !defined(NANO_TINY) && defined(ENABLE_NANORC)
bool old_whitespace;
#endif
va_start(ap, msg);
/* Curses mode is turned off. If we use wmove() now, it will muck
* up the terminal settings. So we just use vfprintf(). */
if (curses_ended) {
vfprintf(stderr, msg, ap);
va_end(ap);
return;
}
/* Blank out the line. */
blank_statusbar();
#if !defined(NANO_TINY) && defined(ENABLE_NANORC)
old_whitespace = ISSET(WHITESPACE_DISPLAY);
UNSET(WHITESPACE_DISPLAY);
#endif
bar = charalloc(mb_cur_max() * (COLS - 3));
vsnprintf(bar, mb_cur_max() * (COLS - 3), msg, ap);
va_end(ap);
foo = display_string(bar, 0, COLS - 4, FALSE);
#if !defined(NANO_TINY) && defined(ENABLE_NANORC)
if (old_whitespace)
SET(WHITESPACE_DISPLAY);
#endif
free(bar);
foo_len = strlenpt(foo);
start_x = (COLS - foo_len - 4) / 2;
wmove(bottomwin, 0, start_x);
wattron(bottomwin, reverse_attr);
waddstr(bottomwin, "[ ");
waddstr(bottomwin, foo);
free(foo);
waddstr(bottomwin, " ]");
wattroff(bottomwin, reverse_attr);
wnoutrefresh(bottomwin);
reset_cursor();
wnoutrefresh(edit);
/* Leave the cursor at its position in the edit window, not in
* the statusbar. */
disable_cursorpos = TRUE;
/* If we're doing quick statusbar blanking, and constant cursor
* position display is off, blank the statusbar after only one
* keystroke. Otherwise, blank it after twenty-five keystrokes,
* as Pico does. */
statusblank =
#ifndef NANO_TINY
ISSET(QUICK_BLANK) && !ISSET(CONST_UPDATE) ? 1 :
#endif
25;
}
/* Display the shortcut list in s on the last two rows of the bottom
* portion of the window. */
void bottombars(const shortcut *s)
{
size_t i, colwidth, slen;
if (ISSET(NO_HELP))
return;
if (s == main_list) {
slen = MAIN_VISIBLE;
assert(slen <= length_of_list(s));
} else {
slen = length_of_list(s);
/* Don't show any more shortcuts than the main list does. */
if (slen > MAIN_VISIBLE)
slen = MAIN_VISIBLE;
}
/* There will be this many characters per column, except for the
* last two, which will be longer by (COLS % colwidth) columns so as
* to not waste space. We need at least three columns to display
* anything properly. */
colwidth = COLS / ((slen / 2) + (slen % 2));
blank_bottombars();
for (i = 0; i < slen; i++, s = s->next) {
const char *keystr;
char foo[4] = "";
/* Yucky sentinel values that we can't handle a better way. */
if (s->ctrlval == NANO_CONTROL_SPACE)
strcpy(foo, "^ ");
else if (s->ctrlval == NANO_CONTROL_8)
strcpy(foo, "^?");
/* Normal values. Assume that the shortcut has an equivalent
* control key, meta key sequence, or both. */
else if (s->ctrlval != NANO_NO_KEY)
sprintf(foo, "^%c", s->ctrlval + 64);
else if (s->metaval != NANO_NO_KEY)
sprintf(foo, "M-%c", toupper(s->metaval));
keystr = foo;
wmove(bottomwin, 1 + i % 2, (i / 2) * colwidth);
onekey(keystr, s->desc, colwidth + (COLS % colwidth));
}
wnoutrefresh(bottomwin);
reset_cursor();
wnoutrefresh(edit);
}
/* Write a shortcut key to the help area at the bottom of the window.
* keystroke is e.g. "^G" and desc is e.g. "Get Help". We are careful
* to write at most len characters, even if len is very small and
* keystroke and desc are long. Note that waddnstr(,,(size_t)-1) adds
* the whole string! We do not bother padding the entry with blanks. */
void onekey(const char *keystroke, const char *desc, size_t len)
{
size_t keystroke_len = strlenpt(keystroke) + 1;
assert(keystroke != NULL && desc != NULL);
wattron(bottomwin, reverse_attr);
waddnstr(bottomwin, keystroke, actual_x(keystroke, len));
wattroff(bottomwin, reverse_attr);
if (len > keystroke_len)
len -= keystroke_len;
else
len = 0;
if (len > 0) {
waddch(bottomwin, ' ');
waddnstr(bottomwin, desc, actual_x(desc, len));
}
}
/* Reset current_y, based on the position of current, and put the cursor
* in the edit window at (current_y, current_x). */
void reset_cursor(void)
{
/* If we haven't opened any files yet, put the cursor in the top
* left corner of the edit window and get out. */
if (openfile == NULL) {
wmove(edit, 0, 0);
return;
}
openfile->current_y = openfile->current->lineno -
openfile->edittop->lineno;
if (openfile->current_y < editwinrows) {
size_t xpt = xplustabs();
wmove(edit, openfile->current_y, xpt - get_page_start(xpt));
}
}
/* edit_draw() takes care of the job of actually painting a line into
* the edit window. fileptr is the line to be painted, at row line of
* the window. converted is the actual string to be written to the
* window, with tabs and control characters replaced by strings of
* regular characters. start is the column number of the first
* character of this page. That is, the first character of converted
* corresponds to character number actual_x(fileptr->data, start) of the
* line. */
void edit_draw(const filestruct *fileptr, const char *converted, int
line, size_t start)
{
#if !defined(NANO_TINY) || defined(ENABLE_COLOR)
size_t startpos = actual_x(fileptr->data, start);
/* The position in fileptr->data of the leftmost character
* that displays at least partially on the window. */
size_t endpos = actual_x(fileptr->data, start + COLS - 1) + 1;
/* The position in fileptr->data of the first character that is
* completely off the window to the right.
*
* Note that endpos might be beyond the null terminator of the
* string. */
#endif
assert(openfile != NULL && fileptr != NULL && converted != NULL);
assert(strlenpt(converted) <= COLS);
/* Just paint the string in any case (we'll add color or reverse on
* just the text that needs it). */
mvwaddstr(edit, line, 0, converted);
#ifdef ENABLE_COLOR
/* If color syntaxes are available and turned on, we need to display
* them. */
if (openfile->colorstrings != NULL && !ISSET(NO_COLOR_SYNTAX)) {
const colortype *tmpcolor = openfile->colorstrings;
for (; tmpcolor != NULL; tmpcolor = tmpcolor->next) {
int x_start;
/* Starting column for mvwaddnstr. Zero-based. */
int paintlen;
/* Number of chars to paint on this line. There are COLS
* characters on a whole line. */
size_t index;
/* Index in converted where we paint. */
regmatch_t startmatch;
/* Match position for start_regex. */
regmatch_t endmatch;
/* Match position for end_regex. */
if (tmpcolor->bright)
wattron(edit, A_BOLD);
wattron(edit, COLOR_PAIR(tmpcolor->pairnum));
/* Two notes about regexec(). A return value of zero means
* that there is a match. Also, rm_eo is the first
* non-matching character after the match. */
/* First case, tmpcolor is a single-line expression. */
if (tmpcolor->end == NULL) {
size_t k = 0;
/* We increment k by rm_eo, to move past the end of the
* last match. Even though two matches may overlap, we
* want to ignore them, so that we can highlight
* C-strings correctly. */
while (k < endpos) {
/* Note the fifth parameter to regexec(). It says
* not to match the beginning-of-line character
* unless k is 0. If regexec() returns REG_NOMATCH,
* there are no more matches in the line. */
if (regexec(tmpcolor->start, &fileptr->data[k], 1,
&startmatch, (k == 0) ? 0 : REG_NOTBOL) ==
REG_NOMATCH)
break;
/* Translate the match to the beginning of the
* line. */
startmatch.rm_so += k;
startmatch.rm_eo += k;
if (startmatch.rm_so == startmatch.rm_eo) {
startmatch.rm_eo++;
statusbar(
_("Refusing zero-length regex match"));
} else if (startmatch.rm_so < endpos &&
startmatch.rm_eo > startpos) {
if (startmatch.rm_so <= startpos)
x_start = 0;
else
x_start = strnlenpt(fileptr->data,
startmatch.rm_so) - start;
index = actual_x(converted, x_start);
paintlen = actual_x(converted + index,
strnlenpt(fileptr->data,
startmatch.rm_eo) - start - x_start);
assert(0 <= x_start && 0 <= paintlen);
mvwaddnstr(edit, line, x_start, converted +
index, paintlen);
}
k = startmatch.rm_eo;
}
} else {
/* This is a multi-line regex. There are two steps.
* First, we have to see if the beginning of the line is
* colored by a start on an earlier line, and an end on
* this line or later.
*
* We find the first line before fileptr matching the
* start. If every match on that line is followed by an
* end, then go to step two. Otherwise, find the next
* line after start_line matching the end. If that line
* is not before fileptr, then paint the beginning of
* this line. */
const filestruct *start_line = fileptr->prev;
/* The first line before fileptr matching start. */
regoff_t start_col;
/* Where it starts in that line. */
const filestruct *end_line;
while (start_line != NULL && regexec(tmpcolor->start,
start_line->data, 1, &startmatch, 0) ==
REG_NOMATCH) {
/* If there is an end on this line, there is no need
* to look for starts on earlier lines. */
if (regexec(tmpcolor->end, start_line->data, 0,
NULL, 0) == 0)
goto step_two;
start_line = start_line->prev;
}
/* No start found, so skip to the next step. */
if (start_line == NULL)
goto step_two;
/* Now start_line is the first line before fileptr
* containing a start match. Is there a start on this
* line not followed by an end on this line? */
start_col = 0;
while (TRUE) {
start_col += startmatch.rm_so;
startmatch.rm_eo -= startmatch.rm_so;
if (regexec(tmpcolor->end, start_line->data +
start_col + startmatch.rm_eo, 0, NULL,
(start_col + startmatch.rm_eo == 0) ? 0 :
REG_NOTBOL) == REG_NOMATCH)
/* No end found after this start. */
break;
start_col++;
if (regexec(tmpcolor->start, start_line->data +
start_col, 1, &startmatch,
REG_NOTBOL) == REG_NOMATCH)
/* No later start on this line. */
goto step_two;
}
/* Indeed, there is a start not followed on this line by
* an end. */
/* We have already checked that there is no end before
* fileptr and after the start. Is there an end after
* the start at all? We don't paint unterminated
* starts. */
end_line = fileptr;
while (end_line != NULL && regexec(tmpcolor->end,
end_line->data, 1, &endmatch, 0) == REG_NOMATCH)
end_line = end_line->next;
/* No end found, or it is too early. */
if (end_line == NULL || (end_line == fileptr &&
endmatch.rm_eo <= startpos))
goto step_two;
/* Now paint the start of fileptr. */
if (end_line != fileptr)
/* If the start of fileptr is on a different line
* from the end, paintlen is -1, meaning that
* everything on the line gets painted. */
paintlen = -1;
else
/* Otherwise, paintlen is the expanded location of
* the end of the match minus the expanded location
* of the beginning of the page. */
paintlen = actual_x(converted,
strnlenpt(fileptr->data, endmatch.rm_eo) -
start);
mvwaddnstr(edit, line, 0, converted, paintlen);
step_two:
/* Second step, we look for starts on this line. */
start_col = 0;
while (start_col < endpos) {
if (regexec(tmpcolor->start, fileptr->data +
start_col, 1, &startmatch, (start_col == 0) ?
0 : REG_NOTBOL) == REG_NOMATCH || start_col +
startmatch.rm_so >= endpos)
/* No more starts on this line. */
break;
/* Translate the match to be relative to the
* beginning of the line. */
startmatch.rm_so += start_col;
startmatch.rm_eo += start_col;
if (startmatch.rm_so <= startpos)
x_start = 0;
else
x_start = strnlenpt(fileptr->data,
startmatch.rm_so) - start;
index = actual_x(converted, x_start);
if (regexec(tmpcolor->end, fileptr->data +
startmatch.rm_eo, 1, &endmatch,
(startmatch.rm_eo == 0) ? 0 : REG_NOTBOL) ==
0) {
/* Translate the end match to be relative to the
* beginning of the line. */
endmatch.rm_so += startmatch.rm_eo;
endmatch.rm_eo += startmatch.rm_eo;
/* There is an end on this line. But does it
* appear on this page, and is the match more
* than zero characters long? */
if (endmatch.rm_eo > startpos &&
endmatch.rm_eo > startmatch.rm_so) {
paintlen = actual_x(converted + index,
strnlenpt(fileptr->data,
endmatch.rm_eo) - start - x_start);
assert(0 <= x_start && x_start < COLS);
mvwaddnstr(edit, line, x_start, converted +
index, paintlen);
}
} else {
/* There is no end on this line. But we haven't
* yet looked for one on later lines. */
end_line = fileptr->next;
while (end_line != NULL &&
regexec(tmpcolor->end, end_line->data,
0, NULL, 0) == REG_NOMATCH)
end_line = end_line->next;
if (end_line != NULL) {
assert(0 <= x_start && x_start < COLS);
mvwaddnstr(edit, line, x_start, converted +
index, -1);
/* We painted to the end of the line, so
* don't bother checking any more starts. */
break;
}
}
start_col = startmatch.rm_so + 1;
}
}
wattroff(edit, A_BOLD);
wattroff(edit, COLOR_PAIR(tmpcolor->pairnum));
}
}
#endif /* ENABLE_COLOR */
#ifndef NANO_TINY
/* If the mark is on, we need to display it. */
if (openfile->mark_set && (fileptr->lineno <=
openfile->mark_begin->lineno || fileptr->lineno <=
openfile->current->lineno) && (fileptr->lineno >=
openfile->mark_begin->lineno || fileptr->lineno >=
openfile->current->lineno)) {
/* fileptr is at least partially selected. */
const filestruct *top;
/* Either current or mark_begin, whichever is first. */
size_t top_x;
/* current_x or mark_begin_x, corresponding to top. */
const filestruct *bot;
size_t bot_x;
int x_start;
/* Starting column for mvwaddnstr(). Zero-based. */
int paintlen;
/* Number of chars to paint on this line. There are COLS
* characters on a whole line. */
size_t index;
/* Index in converted where we paint. */
mark_order(&top, &top_x, &bot, &bot_x, NULL);
if (top->lineno < fileptr->lineno || top_x < startpos)
top_x = startpos;
if (bot->lineno > fileptr->lineno || bot_x > endpos)
bot_x = endpos;
/* The selected bit of fileptr is on this page. */
if (top_x < endpos && bot_x > startpos) {
assert(startpos <= top_x);
/* x_start is the expanded location of the beginning of the
* mark minus the beginning of the page. */
x_start = strnlenpt(fileptr->data, top_x) - start;
if (bot_x >= endpos)
/* If the end of the mark is off the page, paintlen is
* -1, meaning that everything on the line gets
* painted. */
paintlen = -1;
else
/* Otherwise, paintlen is the expanded location of the
* end of the mark minus the expanded location of the
* beginning of the mark. */
paintlen = strnlenpt(fileptr->data, bot_x) -
(x_start + start);
/* If x_start is before the beginning of the page, shift
* paintlen x_start characters to compensate, and put
* x_start at the beginning of the page. */
if (x_start < 0) {
paintlen += x_start;
x_start = 0;
}
assert(x_start >= 0 && x_start <= strlen(converted));
index = actual_x(converted, x_start);
if (paintlen > 0)
paintlen = actual_x(converted + index, paintlen);
wattron(edit, reverse_attr);
mvwaddnstr(edit, line, x_start, converted + index,
paintlen);
wattroff(edit, reverse_attr);
}
}
#endif /* !NANO_TINY */
}
/* Just update one line in the edit buffer. This is basically a wrapper
* for edit_draw(). The line will be displayed starting with
* fileptr->data[index]. Likely arguments are current_x or zero. */
void update_line(const filestruct *fileptr, size_t index)
{
int line;
/* The line in the edit window that we want to update. */
char *converted;
/* fileptr->data converted to have tabs and control characters
* expanded. */
size_t page_start;
assert(fileptr != NULL);
line = fileptr->lineno - openfile->edittop->lineno;
/* We assume the line numbers are valid. Is that really true? */
assert(line < 0 || line == check_linenumbers(fileptr));
if (line < 0 || line >= editwinrows)
return;
/* First, blank out the line. */
blank_line(edit, line, 0, COLS);
/* Next, convert variables that index the line to their equivalent
* positions in the expanded line. */
index = strnlenpt(fileptr->data, index);
page_start = get_page_start(index);
/* Expand the line, replacing tabs with spaces, and control
* characters with their displayed forms. */
converted = display_string(fileptr->data, page_start, COLS, TRUE);
/* Paint the line. */
edit_draw(fileptr, converted, line, page_start);
free(converted);
if (page_start > 0)
mvwaddch(edit, line, 0, '$');
if (strlenpt(fileptr->data) > page_start + COLS)
mvwaddch(edit, line, COLS - 1, '$');
}
/* Return TRUE if we need an update after moving horizontally, and FALSE
* otherwise. We need one if the mark is on or if old_pww and
* placewewant are on different pages. */
bool need_horizontal_update(size_t old_pww)
{
return
#ifndef NANO_TINY
openfile->mark_set ||
#endif
get_page_start(old_pww) !=
get_page_start(openfile->placewewant);
}
/* Return TRUE if we need an update after moving vertically, and FALSE
* otherwise. We need one if the mark is on or if old_pww and
* placewewant are on different pages. */
bool need_vertical_update(size_t old_pww)
{
return
#ifndef NANO_TINY
openfile->mark_set ||
#endif
get_page_start(old_pww) !=
get_page_start(openfile->placewewant);
}
/* Scroll the edit window in the given direction and the given number
* of lines, and draw new lines on the blank lines left after the
* scrolling. direction is the direction to scroll, either UP or DOWN,
* and nlines is the number of lines to scroll. We change edittop, and
* assume that current and current_x are up to date. We also assume
* that scrollok(edit) is FALSE. */
void edit_scroll(scroll_dir direction, ssize_t nlines)
{
bool do_redraw = need_vertical_update(0);
const filestruct *foo;
ssize_t i;
/* Don't bother scrolling less than one line. */
if (nlines < 1)
return;
/* Part 1: nlines is the number of lines we're going to scroll the
* text of the edit window. */
/* Move the top line of the edit window up or down (depending on the
* value of direction) nlines lines, or as many lines as we can if
* there are fewer than nlines lines available. */
for (i = nlines; i > 0; i--) {
if (direction == UP) {
if (openfile->edittop == openfile->fileage)
break;
openfile->edittop = openfile->edittop->prev;
} else {
if (openfile->edittop == openfile->filebot)
break;
openfile->edittop = openfile->edittop->next;
}
}
/* Limit nlines to the number of lines we could scroll. */
nlines -= i;
/* Don't bother scrolling zero lines or more than the number of
* lines in the edit window minus one; in both cases, get out, and
* in the latter case, call edit_refresh() beforehand. */
if (nlines == 0)
return;
if (nlines >= editwinrows) {
edit_refresh();
return;
}
/* Scroll the text of the edit window up or down nlines lines,
* depending on the value of direction. */
scrollok(edit, TRUE);
wscrl(edit, (direction == UP) ? -nlines : nlines);
scrollok(edit, FALSE);
/* Part 2: nlines is the number of lines in the scrolled region of
* the edit window that we need to draw. */
/* If the top or bottom line of the file is now visible in the edit
* window, we need to draw the entire edit window. */
if ((direction == UP && openfile->edittop == openfile->fileage) ||
(direction == DOWN && openfile->edittop->lineno + editwinrows -
1 >= openfile->filebot->lineno))
nlines = editwinrows;
/* If the scrolled region contains only one line, and the line
* before it is visible in the edit window, we need to draw it too.
* If the scrolled region contains more than one line, and the lines
* before and after the scrolled region are visible in the edit
* window, we need to draw them too. */
nlines += (nlines == 1) ? 1 : 2;
if (nlines > editwinrows)
nlines = editwinrows;
/* If we scrolled up, we're on the line before the scrolled
* region. */
foo = openfile->edittop;
/* If we scrolled down, move down to the line before the scrolled
* region. */
if (direction == DOWN) {
for (i = editwinrows - nlines; i > 0 && foo != NULL; i--)
foo = foo->next;
}
/* Draw new lines on any blank lines before or inside the scrolled
* region. If we scrolled down and we're on the top line, or if we
* scrolled up and we're on the bottom line, the line won't be
* blank, so we don't need to draw it unless the mark is on or we're
* not on the first page. */
for (i = nlines; i > 0 && foo != NULL; i--) {
if ((i == nlines && direction == DOWN) || (i == 1 &&
direction == UP)) {
if (do_redraw)
update_line(foo, (foo == openfile->current) ?
openfile->current_x : 0);
} else
update_line(foo, (foo == openfile->current) ?
openfile->current_x : 0);
foo = foo->next;
}
}
/* Update any lines between old_current and current that need to be
* updated. Use this if we've moved without changing any text. */
void edit_redraw(const filestruct *old_current, size_t old_pww)
{
bool do_redraw = need_vertical_update(0) ||
need_vertical_update(old_pww);
const filestruct *foo;
/* If either old_current or current is offscreen, scroll the edit
* window until it's onscreen and get out. */
if (old_current->lineno < openfile->edittop->lineno ||
old_current->lineno >= openfile->edittop->lineno +
editwinrows || openfile->current->lineno <
openfile->edittop->lineno || openfile->current->lineno >=
openfile->edittop->lineno + editwinrows) {
filestruct *old_edittop = openfile->edittop;
ssize_t nlines;
/* Put edittop in range of current, get the difference in lines
* between the original edittop and the current edittop, and
* then restore the original edittop. */
edit_update(
#ifndef NANO_TINY
ISSET(SMOOTH_SCROLL) ? NONE :
#endif
CENTER);
nlines = openfile->edittop->lineno - old_edittop->lineno;
openfile->edittop = old_edittop;
/* Update old_current if we're not on the first page and/or
* we're not on the same page as before. */
if (do_redraw)
update_line(old_current, 0);
/* Scroll the edit window up or down until edittop is in range
* of current. */
if (nlines < 0)
edit_scroll(UP, -nlines);
else
edit_scroll(DOWN, nlines);
return;
}
/* Update old_current and current if we're not on the first page
* and/or we're not on the same page as before. If the mark is on,
* update all the lines between old_current and current too. */
foo = old_current;
while (foo != openfile->current) {
if (do_redraw)
update_line(foo, 0);
#ifndef NANO_TINY
if (!openfile->mark_set)
#endif
break;
#ifndef NANO_TINY
foo = (foo->lineno > openfile->current->lineno) ? foo->prev :
foo->next;
#endif
}
if (do_redraw)
update_line(openfile->current, openfile->current_x);
}
/* Refresh the screen without changing the position of lines. Use this
* if we've moved and changed text. */
void edit_refresh(void)
{
const filestruct *foo;
int nlines;
if (openfile->current->lineno < openfile->edittop->lineno ||
openfile->current->lineno >= openfile->edittop->lineno +
editwinrows)
/* Put the top line of the edit window in range of the current
* line. */
edit_update(
#ifndef NANO_TINY
ISSET(SMOOTH_SCROLL) ? NONE :
#endif
CENTER);
foo = openfile->edittop;
#ifdef DEBUG
fprintf(stderr, "edit_refresh(): edittop->lineno = %ld\n", (long)openfile->edittop->lineno);
#endif
for (nlines = 0; nlines < editwinrows && foo != NULL; nlines++) {
update_line(foo, (foo == openfile->current) ?
openfile->current_x : 0);
foo = foo->next;
}
for (; nlines < editwinrows; nlines++)
blank_line(edit, nlines, 0, COLS);
reset_cursor();
wnoutrefresh(edit);
}
/* Move edittop to put it in range of current, keeping current in the
* same place. location determines how we move it: if it's CENTER, we
* center current, and if it's NONE, we put current current_y lines
* below edittop.